layout: replace menu icon with utf8 character

The three dot menu icosn looks odd when stretched
due to the dynamic menu feature. Thus replace it
with the hamburger menu character that looks better
when scaled.

app/build.gradle.kts

@@ -65,4 +65,5 @@ dependencies {
     androidTestImplementation(libs.androidx.ui.test.junit4)
     debugImplementation(libs.androidx.ui.tooling)
     debugImplementation(libs.androidx.ui.test.manifest)
+    implementation(libs.mpandroidchart.vv310)
 }

app/src/main/AndroidManifest.xml

@@ -30,6 +30,10 @@
             android:name=".SettingsActivity"
             android:label="@string/settings_title"
             android:theme="@style/Theme.LunaTracker"/>
+        <activity
+            android:name=".StatisticsActivity"
+            android:label="@string/statistics_title"
+            android:theme="@style/Theme.LunaTracker"/>
     </application>
 
 </manifest>

app/src/main/java/it/danieleverducci/lunatracker/MainActivity.kt

@@ -155,7 +155,7 @@ class MainActivity : AppCompatActivity() {
             }
         }
 
-        // sort all event types by frequency and ordinal
+        // sort all event types by frequency or ordinal
         val eventTypesSorted = LunaEvent.Type.entries.toList().sortedWith(
             compareBy({ -1 * (eventTypeStats[it] ?: 0) }, { it.ordinal })
         ).filter { it != LunaEvent.Type.UNKNOWN }
@@ -276,7 +276,7 @@ class MainActivity : AppCompatActivity() {
         numberPicker.value = event.quantity / 10
 
         val dateTV = dialogView.findViewById<TextView>(R.id.dialog_date_picker)
-        val pickedTime = dateTimePicker(event.time, dateTV)
+        val pickedTime = datePickerHelper(event.time, dateTV)
 
         if (!showTime) {
             dateTV.visibility = View.GONE
@@ -314,7 +314,7 @@ class MainActivity : AppCompatActivity() {
         weightET.setText(event.quantity.toString())
 
         val dateTV = dialogView.findViewById<TextView>(R.id.dialog_date_picker)
-        val pickedTime = dateTimePicker(event.time, dateTV)
+        val pickedTime = datePickerHelper(event.time, dateTV)
 
         if (!showTime) {
             dateTV.visibility = View.GONE
@@ -365,7 +365,7 @@ class MainActivity : AppCompatActivity() {
         }
 
         val dateTV = dialogView.findViewById<TextView>(R.id.dialog_date_picker)
-        val pickedTime = dateTimePicker(event.time, dateTV)
+        val pickedTime = datePickerHelper(event.time, dateTV)
         if (!showTime) {
             dateTV.visibility = View.GONE
         }
@@ -389,8 +389,7 @@ class MainActivity : AppCompatActivity() {
         alertDialog.show()
     }
 
-    // Pick a date/time.
-    fun dateTimePicker(time: Long, dateTextView: TextView, onChange: (Long) -> Unit = {}): Calendar {
+    fun datePickerHelper(time: Long, dateTextView: TextView, onChange: (Long) -> Unit = {}): Calendar {
         dateTextView.text = DateUtils.formatDateTime(time)
 
         val dateTime = Calendar.getInstance()
@@ -425,79 +424,80 @@ class MainActivity : AppCompatActivity() {
         askSleepValue(event, true) { saveEvent(event) }
     }
 
-    fun askSleepValue(event: LunaEvent, showTime: Boolean, onPositive: () -> Unit) {
+    fun askSleepValue(event: LunaEvent, hideDurationButtons: Boolean, onPositive: () -> Unit) {
         val d = AlertDialog.Builder(this)
         val dialogView = layoutInflater.inflate(R.layout.dialog_edit_duration, null)
         d.setTitle(event.getDialogTitle(this))
+        d.setMessage(event.getDialogMessage(this))
         d.setView(dialogView)
 
         val durationTextView = dialogView.findViewById<TextView>(R.id.dialog_date_duration)
-        val datePickerBegin = dialogView.findViewById<TextView>(R.id.dialog_date_picker_begin)
-        val datePickerEnd = dialogView.findViewById<TextView>(R.id.dialog_date_picker_end)
+        val datePicker = dialogView.findViewById<TextView>(R.id.dialog_date_picker)
+        val durationButtons = dialogView.findViewById<LinearLayout>(R.id.duration_buttons)
+        val durationNowButton = dialogView.findViewById<Button>(R.id.dialog_date_duration_now)
+        val durationMinus5Button = dialogView.findViewById<Button>(R.id.dialog_date_duration_minus5)
+        val durationPlus5Button = dialogView.findViewById<Button>(R.id.dialog_date_duration_plus5)
 
         val currentDurationTextColor = durationTextView.currentTextColor
         val invalidDurationTextColor = ContextCompat.getColor(this, R.color.danger)
 
-        // in seconds
-        var sleepStart = event.time
-        var sleepEnd = event.time + event.quantity
+        var duration = event.quantity
 
-        fun isValidTimeSpan(timeBeginUnix: Long, timeEndUnix: Long): Boolean {
+        fun isValidTime(timeSeconds: Long, durationSeconds: Int): Boolean {
             val now = System.currentTimeMillis() / 1000
-            return (timeBeginUnix > 0)
-                && (timeEndUnix > 0)
-                && (timeBeginUnix <= timeEndUnix)
-                && (timeBeginUnix <= now)
-                && (timeEndUnix <= now)
-                && (timeEndUnix - timeBeginUnix) < (24 * 60 * 60)
+            return (timeSeconds + durationSeconds) <= now && durationSeconds < (24 * 60 * 60)
         }
 
-        // prevent printing of seconds
-        fun adjustToMinute(unixTime: Long): Long {
-            return unixTime - (unixTime % 60)
-        }
-
-        fun updateDuration() {
+        val onDateChange = { time: Long ->
             durationTextView.setTextColor(currentDurationTextColor)
-            val duration = sleepEnd - sleepStart
-            if (duration == 0L) {
+
+            if (duration == 0) {
                 // baby is sleeping
                 durationTextView.text = "💤"
             } else {
-                durationTextView.text = DateUtils.formatTimeDuration(applicationContext, duration)
-                if (!isValidTimeSpan(sleepStart, sleepEnd)) {
+                durationTextView.text = DateUtils.formatTimeDuration(applicationContext, duration.toLong())
+                if (!isValidTime(time, duration)) {
                     durationTextView.setTextColor(invalidDurationTextColor)
                 }
             }
         }
 
-        val pickedDateTimeBegin = dateTimePicker(event.time, datePickerBegin) { time: Long ->
-            sleepStart = adjustToMinute(time)
-            updateDuration()
-        }
+        val pickedDateTime = datePickerHelper(event.time, datePicker, onDateChange)
 
-        val pickedDateTimeEnd = dateTimePicker(event.time + event.quantity, datePickerEnd) { time: Long ->
-            sleepEnd = adjustToMinute(time)
-            updateDuration()
-        }
+        onDateChange(pickedDateTime.time.time / 1000)
 
-        sleepStart = adjustToMinute(pickedDateTimeBegin.time.time / 1000)
-        sleepEnd = adjustToMinute(pickedDateTimeEnd.time.time / 1000)
-        updateDuration()
-
-        if (showTime) {
-            datePickerEnd.visibility = View.GONE
-            durationTextView.visibility = View.GONE
-            //d.setMessage("")
+        if (hideDurationButtons) {
+            durationButtons.visibility = View.GONE
         } else {
-            durationTextView.visibility = View.VISIBLE
-            d.setMessage(event.getDialogMessage(this))
+            durationButtons.visibility = View.VISIBLE
+
+            fun adjust(minutes: Int) {
+                duration += minutes * 60
+                if (duration < 0) {
+                    duration = 0
+                }
+                onDateChange(pickedDateTime.time.time / 1000)
+            }
+
+            durationMinus5Button.setOnClickListener { adjust(-5) }
+            durationPlus5Button.setOnClickListener { adjust(5) }
+
+            durationNowButton.setOnClickListener {
+                val now = System.currentTimeMillis() / 1000
+                val start = pickedDateTime.time.time / 1000
+                if (now > start) {
+                    duration = (now - start).toInt()
+                    duration -= duration % 60 // prevent printing of seconds
+                    onDateChange(pickedDateTime.time.time / 1000)
+                }
+            }
         }
 
         d.setPositiveButton(android.R.string.ok) { dialogInterface, i ->
-            if (isValidTimeSpan(sleepStart, sleepEnd)) {
-                event.time = sleepStart
-                event.quantity = (sleepEnd - sleepStart).toInt()
+            val time = pickedDateTime.time.time / 1000
+            if (isValidTime(time, duration)) {
+                event.time = time
+                event.quantity = duration
                 onPositive()
             } else {
                 Toast.makeText(this, R.string.toast_date_error, Toast.LENGTH_SHORT).show()
@@ -514,7 +514,6 @@ class MainActivity : AppCompatActivity() {
     }
 
     fun addAmountEvent(event: LunaEvent) {
-        setToPreviousQuantity(event)
         askAmountValue(event, true) { saveEvent(event) }
     }
 
@@ -531,11 +530,11 @@ class MainActivity : AppCompatActivity() {
             R.array.AmountLabels,
             android.R.layout.simple_spinner_dropdown_item
         )
-
+        // set pre-selected item and ensure the quantity to index is in bounds
         spinner.setSelection(event.quantity.coerceIn(0, spinner.count - 1))
 
         val dateTV = dialogView.findViewById<TextView>(R.id.dialog_date_picker)
-        val pickedTime = dateTimePicker(event.time, dateTV)
+        val pickedTime = datePickerHelper(event.time, dateTV)
         if (!showTime) {
             dateTV.visibility = View.GONE
         }
@@ -568,7 +567,7 @@ class MainActivity : AppCompatActivity() {
         d.setView(dialogView)
 
         val dateTV = dialogView.findViewById<TextView>(R.id.dialog_date_picker)
-        val pickedDateTime = dateTimePicker(event.time, dateTV)
+        val pickedDateTime = datePickerHelper(event.time, dateTV)
         if (!showTime) {
             dateTV.visibility = View.GONE
         }
@@ -603,7 +602,7 @@ class MainActivity : AppCompatActivity() {
         val qtyET = dialogView.findViewById<EditText>(R.id.notes_qty_edittext)
 
         val dateTV = dialogView.findViewById<TextView>(R.id.dialog_date_picker)
-        val pickedTime = dateTimePicker(event.time, dateTV)
+        val pickedTime = datePickerHelper(event.time, dateTV)
 
         if (!showTime) {
             dateTV.visibility = View.GONE
@@ -815,7 +814,7 @@ class MainActivity : AppCompatActivity() {
             quantityTextView.text = NumericUtils(this).formatEventQuantity(event)
             notesTextView.text = event.notes
             if (event.type == LunaEvent.Type.SLEEP && event.quantity > 0) {
-                dateEndTextView.text = DateUtils.formatDateTime(event.getEndTime())
+                dateEndTextView.text = DateUtils.formatDateTime(event.time + event.quantity)
                 dateEndTextView.visibility = View.VISIBLE
             } else {
                 dateEndTextView.visibility = View.GONE
@@ -829,7 +828,7 @@ class MainActivity : AppCompatActivity() {
         }
         updateValues()
 
-        dateTimePicker(event.time, dateTextView, { newTime: Long ->
+        datePickerHelper(event.time, dateTextView, { newTime: Long ->
             event.time = newTime
             updateValues()
         })
@@ -873,7 +872,7 @@ class MainActivity : AppCompatActivity() {
         val previousEvent = getPreviousSameEvent(event, allEvents)
         if (previousEvent != null) {
             val emoji = previousEvent.getHeaderEmoji(applicationContext)
-            val time = DateUtils.formatTimeDuration(applicationContext, event.getStartTime() - previousEvent.getEndTime())
+            val time = DateUtils.formatTimeDuration(applicationContext, event.time - previousEvent.time)
             previousTextView.text = String.format("⬅️ %s %s", emoji, time)
             previousTextView.setOnClickListener {
                 alertDialog.cancel()
@@ -888,7 +887,7 @@ class MainActivity : AppCompatActivity() {
         val nextEvent = getNextSameEvent(event, allEvents)
         if (nextEvent != null) {
             val emoji = nextEvent.getHeaderEmoji(applicationContext)
-            val time = DateUtils.formatTimeDuration(applicationContext, nextEvent.getStartTime() - event.getEndTime())
+            val time = DateUtils.formatTimeDuration(applicationContext, nextEvent.time - event.time)
             nextTextView.text = String.format("%s %s ➡️", time, emoji)
             nextTextView.setOnClickListener {
                 alertDialog.cancel()
@@ -1284,6 +1283,18 @@ class MainActivity : AppCompatActivity() {
             val inflater = LayoutInflater.from(anchor.context)
             contentView = inflater.inflate(R.layout.more_events_popup, null)
 
+            // Add statistics (hard coded)
+            contentView.findViewById<View>(R.id.button_statistics).setOnClickListener {
+                if (logbook != null && !pauseLogbookUpdate) {
+                    val i = Intent(applicationContext, StatisticsActivity::class.java)
+                    i.putExtra("LOOGBOOK_NAME", logbook!!.name)
+                    startActivity(i)
+                } else {
+                    Toast.makeText(applicationContext, "No logbook selected!", Toast.LENGTH_SHORT).show()
+                }
+                dismiss()
+            }
+
             val linearLayout = contentView.findViewById<LinearLayout>(R.id.layout_list)
 
             // Add buttons to create other events

app/src/main/java/it/danieleverducci/lunatracker/StatisticsActivity.kt

@@ -0,0 +1,997 @@
+package it.danieleverducci.lunatracker
+
+import android.graphics.Color
+import android.os.Bundle
+import android.util.Log
+import android.view.View
+import android.widget.AdapterView
+import android.widget.ArrayAdapter
+import android.widget.Spinner
+import android.widget.TextView
+import android.widget.Toast
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.graphics.toColorInt
+import com.github.mikephil.charting.charts.BarChart
+import com.github.mikephil.charting.data.BarData
+import com.github.mikephil.charting.data.BarDataSet
+import com.github.mikephil.charting.data.BarEntry
+import com.github.mikephil.charting.data.Entry
+import com.github.mikephil.charting.formatter.ValueFormatter
+import com.github.mikephil.charting.highlight.Highlight
+import com.github.mikephil.charting.interfaces.datasets.IBarDataSet
+import com.github.mikephil.charting.listener.OnChartValueSelectedListener
+import it.danieleverducci.lunatracker.entities.LunaEvent
+import utils.DateUtils
+import utils.NumericUtils
+import java.text.SimpleDateFormat
+import java.util.Calendar
+import java.util.Date
+import java.util.Locale
+import kotlin.math.abs
+import kotlin.math.max
+import kotlin.math.min
+
+class StatisticsActivity : AppCompatActivity() {
+    var lastToastShown = 0L
+
+    lateinit var barChart: BarChart
+    lateinit var noDataTextView: TextView
+    lateinit var graphTypeSpinner: Spinner
+    lateinit var timeRangeSpinner: Spinner
+
+    lateinit var unixToSpan: (Long) -> Int
+    lateinit var spanToUnix: (Int) -> Long
+
+    enum class GraphType {
+        BOTTLE_EVENTS,
+        BOTTLE_SUM,
+        SLEEP_SUM,
+        SLEEP_EVENTS,
+        SLEEP_PATTERN,
+        MEDICINE_EVENTS
+    }
+
+    enum class TimeRange {
+        DAY,
+        WEEK,
+        MONTH
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        setContentView(R.layout.activity_statistics)
+
+        val logbookName = intent.getStringExtra("LOOGBOOK_NAME")
+        if (logbookName == null) {
+            finish()
+            return
+        }
+
+        noDataTextView = findViewById(R.id.no_data)
+
+        barChart = findViewById(R.id.bar_chart)
+        barChart.setBackgroundColor(Color.WHITE)
+        barChart.description.text = logbookName
+        barChart.setDrawValueAboveBar(false)
+
+        barChart.axisLeft.setAxisMinimum(0F)
+        barChart.axisLeft.setDrawGridLines(false)
+        barChart.axisLeft.setDrawLabels(false)
+
+        barChart.axisRight.setDrawGridLines(false)
+        barChart.axisRight.setDrawLabels(false)
+
+        //barChart.xAxis.setDrawGridLines(true)
+        barChart.xAxis.setDrawLabels(true)
+        barChart.xAxis.setDrawAxisLine(false)
+
+        graphTypeSpinner = findViewById(R.id.graph_type_selection)
+        timeRangeSpinner = findViewById(R.id.time_range_selection)
+
+        setupSpinner(graphTypeSelection.name,
+            R.id.graph_type_selection,
+            R.array.StatisticsTypeLabels,
+            R.array.StatisticsTypeValues,
+            object : SpinnerItemSelected {
+                override fun call(newValue: String?) {
+                    //Log.d("event", "new value: $newValue")
+                    newValue ?: return
+                    graphTypeSelection = GraphType.valueOf(newValue)
+                    showGraph()
+                }
+            }
+        )
+
+        setupSpinner(timeRangeSelection.name,
+            R.id.time_range_selection,
+            R.array.StatisticsTimeLabels,
+            R.array.StatisticsTimeValues,
+            object : SpinnerItemSelected {
+                override fun call(newValue: String?) {
+                    //Log.d("event", "new value: $newValue")
+                    newValue ?: return
+                    timeRangeSelection = TimeRange.valueOf(newValue)
+                    setSpans()
+                    showGraph()
+                }
+            }
+        )
+
+        setSpans()
+        showGraph()
+    }
+
+    fun setSpans() {
+        unixToSpan  = when (timeRangeSelection) {
+            TimeRange.DAY -> { unix: Long -> unixToDays(unix) }
+            TimeRange.WEEK -> { unix: Long -> unixToWeeks(unix) }
+            TimeRange.MONTH -> { unix: Long -> unixToMonths(unix) }
+        }
+
+        spanToUnix = when (timeRangeSelection) {
+            TimeRange.DAY -> { span: Int -> daysToUnix(span) }
+            TimeRange.WEEK -> { span: Int -> weeksToUnix(span) }
+            TimeRange.MONTH -> { span: Int -> monthsToUnix(span) }
+        }
+    }
+
+    fun showMedicineBarGraph(state: GraphState) {
+        val values = HashMap<String, ArrayList<BarEntry>>()
+
+        for (event in state.events) {
+            val index = unixToSpan(event.time) - state.startSpan
+            val key = event.notes.trim().lowercase()
+            val array = values.getOrPut(key) {
+                ArrayList(List(state.endSpan - state.startSpan + 1) { BarEntry(it.toFloat(), 0F) })
+            }
+
+            array[index].y += 1F
+        }
+
+        /*
+        Log.d(TAG, "values.size: ${values.size}")
+        for ((key, value) in values) {
+            Log.d(TAG, "key: $key, value.size: ${value.size} ,value: ${value.joinToString { it.y.toLong().toString() }}")
+        }
+         */
+
+        // make sure legend names are not too long
+        fun shorten(notes: String): String {
+            return if (notes.length > 16) {
+                notes.take(13) + "..."
+            } else {
+                notes
+            }
+        }
+
+        fun chooseColor(notes: String): Int {
+            return (abs(notes.hashCode()) * 16777215) or (0xFF shl 24)
+        }
+
+        val sets = arrayListOf<IBarDataSet>()
+        for ((key, value) in values.entries) {
+            if (key.startsWith("v")) {
+                val description = shorten(key)
+                val barDataSet = BarDataSet(value, description)
+                barDataSet.color = chooseColor(key)
+                sets.add(barDataSet)
+            }
+        }
+
+        val data = BarData(sets)
+        //data.groupBars(0F, 0.2F, 0.1F);
+        data.setValueTextSize(12f)
+        data.barWidth = 1F
+        //data.groupBars(0F, 1F, 1F)
+
+        data.setValueFormatter(object : ValueFormatter() {
+            override fun getFormattedValue(value: Float): String {
+                return if (value == 0F) {
+                    ""
+                } else {
+                    value.toInt().toString()
+                }
+            }
+        })
+
+        barChart.setScaleEnabled(true)
+        barChart.legend.isEnabled = true
+
+        //barChart.xAxis.setLabelCount(min(values.size, 24), false);
+        //val maxCount = min(maxIndex, 30) // values.size
+        //Log.d(TAG, "maxCount: $maxCount")
+        barChart.setVisibleXRangeMaximum(20F) //maxCount.toFloat()) // show max 24 entries
+        barChart.xAxis.setLabelCount(30, true)
+        //barChart.xAxis.isEnabled = false
+        barChart.xAxis.setCenterAxisLabels(true)
+        barChart.setScaleEnabled(false)
+
+        //barChart.axisLeft.isSLEEP_PATTERN_GRANULARITYEnabled = true
+        //barChart.axisLeft.setSLEEP_PATTERN_GRANULARITY(0.8F)
+
+        barChart.setData(data)
+        barChart.invalidate()
+    }
+
+    data class SleepRange(val start: Long, var end: Long)
+
+    fun toSleepRanges(events: List<LunaEvent>): ArrayList<SleepRange> {
+        val ranges = arrayListOf<SleepRange>()
+        val now = System.currentTimeMillis() / 1000
+
+        // Transform events into time ranges.
+        // Merge overlapping times and extend
+        // ongoing sleep events until now.
+        var warningShown = false
+        for (event in events) {
+            val startTime = event.time
+            val endTime = if (event.quantity == 0) {
+                now
+            } else {
+                event.time + event.quantity
+            }
+
+            // handle overlap
+            val previousRange = ranges.lastOrNull()
+            if (previousRange != null && previousRange.end > startTime) {
+                // cap previous range to avoid overlap
+                previousRange.end = startTime
+                if (!warningShown) {
+                    Toast.makeText(applicationContext, "Overlapping sleep event at ${DateUtils.formatDateTime(startTime)}", Toast.LENGTH_SHORT).show()
+                    warningShown = true
+                }
+            }
+
+            ranges.add(SleepRange(startTime, endTime))
+        }
+
+        return ranges
+    }
+
+    fun showSleepPatternBarGraphSlotted(state: GraphState) {
+        val ranges = toSleepRanges(state.events)
+        val values = ArrayList<BarEntry>()
+        val stack = ArrayList(List(state.endSpan - state.startSpan + 1) { IntArray(24 * 60 * 60 / SLEEP_PATTERN_GRANULARITY) })
+
+        Log.d(TAG, "stack.size: ${stack.size}, array.size: ${stack[0].size}, dayCounter.daysWithData.size: ${state.dayCounter.daysWithData.size}")
+
+        fun stackValuePattern(index: Int, spanBegin: Long, spanEnd: Long, begin: Long, end: Long) {
+            val beginDays = unixToDays(begin)
+            val endDays = unixToDays(end)
+            var mid = begin
+
+            //Log.d(TAG, "stackValuePattern: ${beginDays}..${endDays}")
+
+            for (i in beginDays..endDays) {
+                // i is the days/weeks/months since unix epoch
+                val dayBegin = daysToUnix(i)
+                val dayEnd =  daysToUnix(i + 1)
+                val sleepBegin = max(mid, dayBegin)
+                val sleepEnd = min(end, dayEnd)
+
+                if (sleepBegin != sleepEnd) {
+                    assert(dayBegin <= dayEnd)
+                    assert(sleepBegin <= sleepEnd)
+                    val iBegin = (sleepBegin - dayBegin) / SLEEP_PATTERN_GRANULARITY
+                    val iEnd = iBegin + (sleepEnd - sleepBegin) / SLEEP_PATTERN_GRANULARITY
+                    Log.d(TAG, "index: $index, iBegin: $iBegin, iEnd: $iEnd, dayBegin: ${Date(dayBegin * 1000)}, dayEnd: ${Date(dayEnd * 1000)}, sleepBegin: ${Date(sleepBegin * 1000)}, sleepEnd: ${Date(sleepEnd * 1000)}")
+                    for (j in iBegin..iEnd) {
+                        stack[index][j.toInt()] += 1
+                    }
+                }
+                mid = sleepEnd
+            }
+        }
+
+        for (range in ranges) {
+            // a sleep event can span to another day
+            // distribute sleep time over the days
+            val startUnix = range.start
+            val endUnix = range.end
+            val begIndex = unixToSpan(startUnix)
+            val endIndex = unixToSpan(endUnix)
+            var mid = startUnix
+
+            //Log.d(TAG, "startUnix: ${Date(startUnix * 1000)}, endUnix: ${Date(endUnix * 1000)}, begIndex: $begIndex, endIndex: $endIndex (index diff: ${endIndex - begIndex})")
+            for (i in begIndex..endIndex) {
+                // i is the days/weeks/months since unix epoch
+                val spanBegin = spanToUnix(i)
+                val spanEnd =  spanToUnix(i + 1)
+                //Log.d(TAG, "mid: ${Date(mid * 1000)}, spanBegin: ${Date(spanBegin * 1000)}, spanEnd: ${Date(spanEnd * 1000)}, beginUnix: ${Date(startUnix * 1000)} endUnix: ${Date(endUnix * 1000)}")
+                val sleepBegin = max(mid, spanBegin)
+                val sleepEnd = min(endUnix, spanEnd)
+                val index = i - state.startSpan
+                val duration = sleepEnd - sleepBegin
+                //Log.d(TAG, "[$index] sleepBegin: ${Date(sleepBegin * 1000)}, sleepEnd: ${Date(sleepEnd * 1000)}, ${DateUtils.formatTimeDuration(this, duration)}")
+
+                state.dayCounter.setDaysWithData(sleepBegin, sleepEnd)
+                stackValuePattern(index, spanBegin, spanEnd, sleepBegin, sleepEnd)
+
+                mid = sleepEnd
+            }
+        }
+
+        fun mapColor(occurrences: Int, maxOccurrences: Int): Int {
+            //Log.d(TAG, "$occurrences <= $maxOccurrences")
+            // occurrences: number of reported sleeps in a specific time slice
+            // maxOccurrences: maximum number of days with data that can contribute to maxOccurrences
+            assert(maxOccurrences > 0)
+            assert(occurrences <= maxOccurrences)
+
+
+            // map to color
+            val q = occurrences.toFloat() / maxOccurrences.toFloat()
+            val i = q * (SLEEP_PATTERN_COLORS.size - 1).toFloat()
+            return SLEEP_PATTERN_COLORS[i.toInt()]
+        }
+
+        val allColors = ArrayList<Int>()
+
+        // convert array of time slots that represent a day to value and color arrays used by chart library
+        for ((index, dayArray) in stack.withIndex()) {
+            val daysWithData = state.dayCounter.countDaysWithData(spanToUnix(state.startSpan + index), spanToUnix(state.startSpan + index + 1))
+
+            //Log.d(TAG, "index: $index: daysWithData: $daysWithData, dayArray: ${dayArray.joinToString { it.toString() }}")
+            val vals = ArrayList<Float>()
+
+            var prevIndex = -1 // time slice index
+            var prevValue = -1 // number of entries we have found for time slice
+            for ((i, v) in dayArray.withIndex()) {
+                if (i == 0) {
+                    prevIndex = i
+                    prevValue = v
+                } else if (prevValue != v) {
+                    vals.add((i - prevIndex).toFloat())
+                    allColors.add(mapColor(prevValue.coerceAtMost(daysWithData), daysWithData))
+                    prevIndex = i
+                    prevValue = v
+                }
+            }
+
+            if (prevIndex != -1) {
+                vals.add((dayArray.size - prevIndex).toFloat())
+                allColors.add(mapColor(prevValue, daysWithData))
+            }
+
+            //Log.d(TAG, "Range $index, vals: ${vals.joinToString { it.toInt().toString() }}") //, allColors: ${allColors.joinToString { it.toString() }}")
+
+            values.add(BarEntry(index.toFloat(), vals.toFloatArray()))
+        }
+
+        //Log.d(TAG, "daysWithData: ${state.dayCounter.daysWithData.joinToString()}")
+
+        barChart.setOnChartValueSelectedListener(object : OnChartValueSelectedListener {
+            override fun onValueSelected(e: Entry?, h: Highlight?) {
+                if (e == null || h == null) {
+                    return
+                }
+
+                val index = e.x.toInt()
+                if (index !in 0..values.size) {
+                    return
+                }
+
+                val value = values[index]
+                if (value.yVals == null || h.stackIndex !in 0..value.yVals.size) {
+                    return
+                }
+
+                if ((lastToastShown + TOAST_FREQUENCY_MS) > System.currentTimeMillis()) {
+                    // only show one Toast message after another
+                    return
+                }
+
+                val dayStartUnix = daysToUnix(unixToDays(state.startUnix) + index)
+
+                //Log.d(TAG, "startUnix: ${Date(startUnix * 1000)}, x: ${e.x.toInt()}, dayStartUnix: ${Date(dayStartUnix * 1000)}")
+                val startSeconds =
+                    SLEEP_PATTERN_GRANULARITY * value.yVals.sliceArray(0..<h.stackIndex)
+                        .fold(0) { acc, y -> acc + y.toInt() }
+                val durationSeconds =
+                    SLEEP_PATTERN_GRANULARITY * value.yVals[h.stackIndex].toInt()
+                val endSeconds = startSeconds + durationSeconds
+
+                val format = SimpleDateFormat("HH:mm", Locale.getDefault())
+                val startTimeString =
+                    format.format((dayStartUnix + startSeconds) * 1000).toString()
+                val endTimeString =
+                    format.format((dayStartUnix + endSeconds) * 1000).toString()
+                val durationString = NumericUtils(applicationContext).formatEventQuantity(
+                    LunaEvent.Type.SLEEP,
+                    durationSeconds
+                )
+
+                val daysWithData =
+                    stack[e.x.toInt()][startSeconds / SLEEP_PATTERN_GRANULARITY]
+                val daysWithDataMax = state.dayCounter.countDaysWithData(
+                    spanToUnix(state.startSpan + index),
+                    spanToUnix(state.startSpan + index + 1)
+                )
+
+                // percentage of days in this span where baby is asleep in this time slot
+                val pc = if (daysWithDataMax > 0) {
+                    (100F * daysWithData.toFloat() / daysWithDataMax.toFloat()).toInt()
+                } else {
+                    // no data for this day
+                    0
+                }
+
+                Toast.makeText(
+                    applicationContext,
+                    "$startTimeString - $endTimeString ($durationString) - ${pc}%",
+                    Toast.LENGTH_LONG
+                ).show()
+                lastToastShown = System.currentTimeMillis()
+            }
+
+            override fun onNothingSelected() {}
+        })
+
+        val set1 = BarDataSet(values, "")
+        val data = BarData(set1)
+        set1.colors = allColors
+
+        set1.setDrawValues(false) // usually too many values
+        set1.isHighlightEnabled = true
+
+        set1.setDrawIcons(false)
+        barChart.legend.isEnabled = false
+        barChart.setScaleEnabled(false)
+        barChart.xAxis.setLabelCount(min(values.size, 24))
+        data.setValueTextSize(12f)
+        barChart.setData(data)
+
+        barChart.invalidate()
+    }
+
+    // Sleep pattern bars that do not use time slots.
+    // This is useful/nicer for bars that only represent data of a singlur days.
+    fun showSleepPatternBarGraphDaily(state: GraphState) {
+        val ranges = toSleepRanges(state.events)
+        val values = ArrayList(List(state.endSpan - state.startSpan + 1) { BarEntry(it.toFloat(), FloatArray(0)) })
+
+        // stack awake/sleep durations
+        fun stackValuePattern(index: Int, spanBegin: Long, spanEnd: Long, begin: Long, end: Long) {
+            assert(begin in spanBegin..spanEnd)
+            assert(end in spanBegin..spanEnd)
+            assert(begin <= end)
+
+            val x = values[index].x
+            val yVals  = values[index].yVals // alternating sleep/awake durations
+            val y = yVals.fold(0F) { acc, next -> acc + next }
+
+            // y value is seconds when last awake
+            val awakeDuration = max(begin - spanBegin - y.toLong(), 0L)
+            val sleepDuration = end - begin
+
+            if ((awakeDuration + sleepDuration) > (spanEnd - spanBegin)) {
+                Log.e(TAG, "Invalid sleep duration, exceeds day/week or month bounds => ignore value")
+                return
+            }
+
+            // update value
+            val newYVals = appendToFloatArray(yVals, awakeDuration.toFloat(), sleepDuration.toFloat())
+            values[index] = BarEntry(x, newYVals)
+        }
+
+        for (range in ranges) {
+            // a sleep event can span to another day
+            // distribute sleep time over the days
+            val startUnix = range.start
+            val endUnix = range.end
+            val begIndex = unixToSpan(startUnix)
+            val endIndex = unixToSpan(endUnix)
+            var mid = startUnix
+
+            //Log.d(TAG, "startUnix: ${Date(startUnix * 1000)}, endUnix: ${Date(endUnix * 1000)}, begIndex: $begIndex, endIndex: $endIndex (index diff: ${endIndex - begIndex})")
+            for (i in begIndex..endIndex) {
+                // i is the days/weeks/months since unix epoch
+                val spanBegin = spanToUnix(i)
+                val spanEnd =  spanToUnix(i + 1)
+                //Log.d(TAG, "mid: ${Date(mid * 1000)}, spanBegin: ${Date(spanBegin * 1000)}, spanEnd: ${Date(spanEnd * 1000)}, beginUnix: ${Date(startUnix * 1000)} endUnix: ${Date(endUnix * 1000)}")
+                val sleepBegin = max(mid, spanBegin)
+                val sleepEnd = min(endUnix, spanEnd)
+                val index = i - state.startSpan
+                val duration = sleepEnd - sleepBegin
+                //Log.d(TAG, "[$index] sleepBegin: ${Date(sleepBegin * 1000)}, sleepEnd: ${Date(sleepEnd * 1000)}, ${DateUtils.formatTimeDuration(this, duration)}")
+
+                state.dayCounter.setDaysWithData(sleepBegin, sleepEnd)
+                stackValuePattern(index, spanBegin, spanEnd, sleepBegin, sleepEnd)
+
+                mid = sleepEnd
+            }
+        }
+
+        val set1 = BarDataSet(values, "")
+        val data = BarData(set1)
+
+        // awake phase color is transparent
+        set1.colors = arrayListOf("#00000000".toColorInt(), "#72d7f5".toColorInt())
+        set1.setDrawValues(false) // usually too many values
+        set1.isHighlightEnabled = true
+
+        //barChart.xAxis.setCenterAxisLabels(true)
+
+        barChart.setOnChartValueSelectedListener(object : OnChartValueSelectedListener {
+            override fun onValueSelected(e: Entry?, h: Highlight?) {
+                if (e == null || h == null) {
+                    return
+                }
+
+                val index = e.x.toInt()
+                if (index !in 0..values.size) {
+                    return
+                }
+
+                val value = values[index]
+                if (value.yVals == null || h.stackIndex !in 0..value.yVals.size) {
+                    return
+                }
+
+                if ((lastToastShown + TOAST_FREQUENCY_MS) > System.currentTimeMillis()) {
+                    // only show one Toast message after another
+                    return
+                }
+
+                val duration = value.yVals[h.stackIndex].toInt()
+                val durationString = NumericUtils(applicationContext).formatEventQuantity(LunaEvent.Type.SLEEP, duration)
+
+                val offsetUnix = spanToUnix(state.startSpan + e.x.toInt()) // start of the time span (day/week/month)
+                val startUnix = offsetUnix + value.yVals.sliceArray(0..<h.stackIndex).fold(0) { acc, y -> acc + y.toInt() }
+                val endUnix = startUnix + duration
+
+                val format = SimpleDateFormat("HH:mm", Locale.getDefault())
+                val startTimeString = format.format(startUnix * 1000).toString()
+                val endTimeString = format.format(endUnix * 1000).toString()
+                Toast.makeText(applicationContext, "$startTimeString - $endTimeString ($durationString)", Toast.LENGTH_LONG).show()
+                lastToastShown = System.currentTimeMillis()
+            }
+
+            override fun onNothingSelected() {}
+        })
+
+        set1.setDrawIcons(false)
+        barChart.legend.isEnabled = false
+        barChart.setScaleEnabled(false)
+        barChart.xAxis.setLabelCount(min(values.size, 24))
+        data.setValueTextSize(12f)
+        barChart.setData(data)
+
+        barChart.invalidate()
+    }
+
+    fun showSleepBarGraph(state: GraphState) {
+        val ranges = toSleepRanges(state.events)
+        val values = ArrayList(List(state.endSpan - state.startSpan + 1) { BarEntry(it.toFloat(), 0F) })
+        //Log.d(TAG, "startUnix: ${Date(state.startUnix * 1000)}, endUnix: ${Date(state.endUnix * 1000)}")
+
+        for (range in ranges) {
+            // a sleep event can span to another day
+            // distribute sleep time over the days
+            val startUnix = range.start
+            val endUnix = range.end
+            val begIndex = unixToSpan(startUnix)
+            val endIndex = unixToSpan(endUnix)
+            var mid = startUnix
+
+            //Log.d(TAG, "beginIndex: $begIndex, endIndex: $endIndex, startUnix: ${Date(startUnix * 1000)} ($startUnix), endUnix: ${Date(endUnix * 1000)} ($endUnix)")
+            //Log.d(TAG, "startUnix: ${Date(startUnix * 1000)}, endUnix: ${Date(endUnix * 1000)}, begIndex: $begIndex, endIndex: $endIndex (index diff: ${endIndex - begIndex})")
+            for (i in begIndex..endIndex) {
+                // i is the days/weeks/months since unix epoch
+                val spanBegin = spanToUnix(i)
+                val spanEnd =  spanToUnix(i + 1)
+                //Log.d(TAG, "i: $i, mid: ${Date(mid * 1000)}, spanBegin: ${Date(spanBegin * 1000)}, spanEnd: ${Date(spanEnd * 1000)}, beginUnix: ${Date(startUnix * 1000)} endUnix: ${Date(endUnix * 1000)}")
+                val sleepBegin = max(mid, spanBegin)
+                val sleepEnd = min(endUnix, spanEnd)
+                val index = i - state.startSpan
+                val duration = sleepEnd - sleepBegin
+                //Log.d(TAG, "[$index] sleepBegin: ${Date(sleepBegin * 1000)}, sleepEnd: ${Date(sleepEnd * 1000)}, ${DateUtils.formatTimeDuration(this, duration)}")
+
+                state.dayCounter.setDaysWithData(sleepBegin, sleepEnd)
+
+                if (graphTypeSelection == GraphType.SLEEP_SUM) {
+                    values[index].y += duration.toFloat()
+                } else if (graphTypeSelection == GraphType.SLEEP_EVENTS) {
+                    values[index].y += 1F
+                } else {
+                    Log.e(TAG, "Unexpected graph type.")
+                    return
+                }
+
+                mid = sleepEnd
+            }
+        }
+
+        if (graphTypeSelection == GraphType.SLEEP_SUM) {
+            for (index in values.indices) {
+                val daysWithData = state.dayCounter.countDaysWithData(spanToUnix(state.startSpan + index), spanToUnix(state.startSpan + index + 1))
+                if (daysWithData == 0) {
+                    assert(values[index].y == 0F)
+                } else {
+                    values[index].y /= daysWithData
+                }
+            }
+        }
+
+        val set1 = BarDataSet(values, "")
+        val data = BarData(set1)
+        set1.setDrawValues(true)
+        set1.isHighlightEnabled = false
+
+        data.setValueFormatter(object : ValueFormatter() {
+            override fun getFormattedValue(value: Float): String {
+                return when (graphTypeSelection) {
+                    GraphType.SLEEP_EVENTS -> value.toInt().toString()
+                    GraphType.SLEEP_SUM -> {
+                        val prefix = if (timeRangeSelection == TimeRange.DAY) { "" } else { "⌀ " }
+                        return prefix + NumericUtils(applicationContext).formatEventQuantity(LunaEvent.Type.SLEEP, value.toInt())
+                    }
+                    else -> {
+                        Log.e(TAG, "unhandled graphTypeSelection $graphTypeSelection")
+                        value.toInt().toString()
+                    }
+                }
+            }
+        })
+
+        set1.setDrawIcons(false)
+        barChart.legend.isEnabled = false
+        barChart.setScaleEnabled(false)
+        barChart.xAxis.setLabelCount(min(values.size, 24))
+        data.setValueTextSize(12f)
+        barChart.setData(data)
+
+        barChart.invalidate()
+    }
+
+    fun showBottleBarGraph(state: GraphState) {
+        val values = ArrayList(List(state.endSpan - state.startSpan + 1) { BarEntry(it.toFloat(), 0F) })
+
+        // needed?
+        for (i in values.indices) {
+            values[i].x = i.toFloat()
+        }
+
+        for (event in state.events) {
+            val index = unixToSpan(event.time) - state.startSpan
+
+            state.dayCounter.setDaysWithData(event.time, event.time)
+
+            // setDaysWithData(sleepBegin, sleepEnd)
+            if (graphTypeSelection == GraphType.BOTTLE_EVENTS) {
+                values[index].y += 1F
+            } else if (graphTypeSelection == GraphType.BOTTLE_SUM) {
+                values[index].y += event.quantity.toFloat()
+            } else {
+                Log.e(TAG, "unhandled graphTypeSelection: $graphTypeSelection")
+                return
+            }
+        }
+
+        if (graphTypeSelection == GraphType.BOTTLE_SUM) {
+            for (index in values.indices) {
+                val daysWithData = state.dayCounter.countDaysWithData(spanToUnix(state.startSpan + index), spanToUnix(state.startSpan + index + 1))
+                //Log.d(TAG, "index: $index, daysWithData: $daysWithData")
+                if (daysWithData == 0) {
+                    assert(values[index].y == 0F)
+                } else {
+                    values[index].y /= daysWithData
+                }
+            }
+        }
+
+        val set1 = BarDataSet(values, "")
+
+        set1.setDrawValues(true)
+        set1.isHighlightEnabled = false
+
+        //barChart.axisLeft.isSLEEP_PATTERN_GRANULARITYEnabled = true
+        //barChart.axisLeft.setSLEEP_PATTERN_GRANULARITY(0.8F)
+
+        val data = BarData(set1)
+        //data.barWidth = 0.3F // 0.85 default // ratio of barWidth to totalWidth.
+        //Log.d(TAG, "data.barWidth: ${data.barWidth}")
+
+        data.setValueFormatter(object : ValueFormatter() {
+            override fun getFormattedValue(value: Float): String {
+                //Log.d(TAG, "getFormattedValue ${dataTypeSelectionValue} ${eventTypeSelectionValue}")
+                return when (graphTypeSelection) {
+                    GraphType.BOTTLE_EVENTS -> value.toInt().toString()
+                    GraphType.BOTTLE_SUM -> {
+                        val prefix = if (timeRangeSelection == TimeRange.DAY) { "" } else { "⌀ " }
+                        return prefix + NumericUtils(applicationContext).formatEventQuantity(LunaEvent.Type.BABY_BOTTLE, value.toInt())
+                    }
+                    else -> {
+                        Log.e(TAG, "unhandled graphTypeSelection")
+                        value.toInt().toString()
+                    }
+                }
+            }
+        })
+
+// hm, does not work yet
+
+        data.setValueTextSize(12f)
+        barChart.setData(data)
+
+        barChart.moveViewToX(values.lastOrNull()!!.x)
+
+        val maximumRange = 16F
+        //val count = values.size.coerceIn(5, 20)
+        barChart.setVisibleXRangeMaximum(maximumRange) // show max 24 entries
+        barChart.xAxis.setLabelCount(maximumRange.toInt(), true)
+        //barChart.xAxis.isEnabled = false
+        barChart.xAxis.setCenterAxisLabels(true)
+        barChart.setScaleEnabled(false)
+
+        barChart.invalidate()
+    }
+
+    class DayCounter(val startDays: Int, val stopDays: Int) {
+        val daysWithData = BooleanArray(stopDays - startDays + 1)
+
+        // count days in a span that have data
+        // e.g. return 7 (days) for applied span of a week where there is data for every day 
+        fun countDaysWithData(beginUnix: Long, endUnix: Long): Int {
+            val beginDays = unixToDays(beginUnix)
+            val endDays = unixToDays(endUnix)
+            //Log.d(TAG, "countDaysWithData: beginDays: $beginDays, endDays: $endDays, ${Date(beginUnix * 1000)} - ${Date(endUnix * 1000)}")
+            var count = 0
+            for (i in (beginDays - startDays)..<(endDays - startDays)) {
+                //Log.d(TAG, "countDaysWithData: i: $i, size: ${daysWithData.size}")
+                count += if (daysWithData[i]) { 1 } else { 0 }
+            }
+            return count
+        }
+
+        fun setDaysWithData(beginUnix: Long, endUnix: Long) {
+            val beginDays = unixToDays(beginUnix)
+            val endDays = unixToDays(endUnix)
+            assert(beginDays <= endDays)
+            assert(startDays <= beginDays)
+            for (i in (beginDays - startDays)..(endDays - startDays)) {
+                daysWithData[i] = true
+            }
+        }
+    }
+
+    data class GraphState(val events: List<LunaEvent>, val dayCounter: DayCounter, val startUnix: Long, val endUnix: Long, val startSpan: Int, val endSpan: Int)
+
+    // wrapper for comon graph setup
+    fun prepareGraph(type: LunaEvent.Type, callback: (GraphState) -> Unit) {
+        val events = MainActivity.allEvents.filter { it.type == type }.sortedBy { it.time }
+
+        if (events.isEmpty()) {
+            barChart.visibility = View.GONE
+            noDataTextView.visibility = View.VISIBLE
+            return
+        } else {
+            barChart.visibility = View.VISIBLE
+            noDataTextView.visibility = View.GONE
+        }
+
+        // unix time span of all events
+        val startUnix = events.minOf { it.time }
+        val endUnix = System.currentTimeMillis() / 1000
+
+        // convert to days, weeks or months
+        val startSpan = unixToSpan(startUnix)
+        val endSpan = unixToSpan(endUnix)
+
+        // days when the a day/week/month starts/ends
+        val startDays = unixToDays(spanToUnix(startSpan))
+        val endDays = unixToDays(spanToUnix(endSpan + 1)) // until end of next week
+        val dayCounter = DayCounter(startDays, endDays)
+
+        // print dates
+        barChart.xAxis.valueFormatter = object: ValueFormatter() {
+            override fun getFormattedValue(value: Float): String {
+                val index = value.toInt()
+                val unixSeconds = spanToUnix(startSpan + index)
+
+                val dateTime = Calendar.getInstance()
+                dateTime.time = Date(1000L * unixSeconds)
+                val year = dateTime.get(Calendar.YEAR)
+                val month = dateTime.get(Calendar.MONTH) + 1 // month starts at 0
+                val week = dateTime.get(Calendar.WEEK_OF_YEAR)
+                val day = dateTime.get(Calendar.DAY_OF_MONTH)
+
+                // Dirty hack to get monotone number of weeks
+                // The first week if the year might start in the previous year.
+                val yearFixed = if (month == 12 && week == 1) {
+                    year + 1
+                } else {
+                    year
+                }
+
+                return when (timeRangeSelection) {
+                    TimeRange.DAY -> "$day/$month/$yearFixed"
+                    TimeRange.WEEK -> "$week/$yearFixed"
+                    TimeRange.MONTH -> "$month/$yearFixed"
+                }
+            }
+        }
+
+        //Log.d(TAG, "startDaysUnix: ${Date(daysToUnix(startDays) * 1000)}. endDaysUnix: ${Date(daysToUnix(endDays) * 1000)}")
+
+        callback(GraphState(events, dayCounter, startUnix, endUnix, startSpan, endSpan))
+    }
+
+    fun showGraph() {
+        //Log.d(TAG, "showGraph: graphTypeSelection: $graphTypeSelection, timeRangeSelection: $timeRangeSelection")
+
+        when (graphTypeSelection) {
+            GraphType.BOTTLE_EVENTS,
+            GraphType.BOTTLE_SUM -> prepareGraph(LunaEvent.Type.BABY_BOTTLE) { state -> showBottleBarGraph(state) }
+            GraphType.SLEEP_EVENTS,
+            GraphType.SLEEP_SUM -> prepareGraph(LunaEvent.Type.SLEEP) { state -> showSleepBarGraph(state) }
+            GraphType.SLEEP_PATTERN -> prepareGraph(LunaEvent.Type.SLEEP) { state ->
+                if (timeRangeSelection == TimeRange.DAY) {
+                    // specialized pattern bar for daily view
+                    showSleepPatternBarGraphDaily(state)
+                } else {
+                    showSleepPatternBarGraphSlotted(state)
+                }
+            }
+            GraphType.MEDICINE_EVENTS -> prepareGraph(LunaEvent.Type.MEDICINE) { state -> showMedicineBarGraph(state) }
+        }
+    }
+
+    private interface SpinnerItemSelected {
+        fun call(newValue: String?)
+    }
+
+    private fun setupSpinner(
+        currentValue: String,
+        spinnerId: Int,
+        arrayId: Int,
+        arrayValuesId: Int,
+        callback: SpinnerItemSelected
+    ) {
+        val arrayValues = resources.getStringArray(arrayValuesId)
+        val spinner = findViewById<Spinner>(spinnerId)
+        val spinnerAdapter =
+            ArrayAdapter.createFromResource(this, arrayId, R.layout.statistics_spinner_item)
+
+        //Log.d(TAG, "spinner ${arrayValues.indexOf(currentValue)} (${arrayValues.joinToString { it }})")
+
+        spinner.adapter = spinnerAdapter
+        spinner.setSelection(arrayValues.indexOf(currentValue))
+        spinner.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
+            var check = 0
+            override fun onItemSelected(parent: AdapterView<*>?, view: View?, pos: Int, id: Long) {
+                if (pos >= arrayValues.size) {
+                    Toast.makeText(
+                        this@StatisticsActivity,
+                        "pos out of bounds: $arrayValues", Toast.LENGTH_SHORT
+                    ).show()
+                    return
+                }
+                if (check++ > 0) {
+                    callback.call(arrayValues[pos])
+                }
+            }
+
+            override fun onNothingSelected(parent: AdapterView<*>?) {
+                // ignore
+            }
+        }
+    }
+
+    companion object {
+        const val TAG = "StatisticsActivity"
+
+        // 15 min steps
+        const val SLEEP_PATTERN_GRANULARITY = 15 * 60
+
+        // Time between toast messages (to prevent jams)
+        const val TOAST_FREQUENCY_MS = 3500
+
+        // color gradient
+        val SLEEP_PATTERN_COLORS = arrayOf(
+            "#FFFFFF".toColorInt(), "#EEF5F7".toColorInt(), "#DDEBEF".toColorInt(), "#CCE2E7".toColorInt(),
+            "#BBD8DF".toColorInt(), "#AACED7".toColorInt(), "#99C4CF".toColorInt(), "#88BAC7".toColorInt(),
+            "#77B1BF".toColorInt(), "#66A7B7".toColorInt(), "#559DAF".toColorInt(), "#4493A7".toColorInt(),
+            "#33899F".toColorInt(), "#228097".toColorInt(), "#11768F".toColorInt(), "#006C87".toColorInt()
+        )
+
+        var graphTypeSelection = GraphType.SLEEP_SUM
+        var timeRangeSelection = TimeRange.DAY
+
+        private val dateTime = Calendar.getInstance() // scratch pad
+
+        // convert month to seconds since epoch
+        fun unixToMonths(seconds: Long): Int {
+            dateTime.time = Date(seconds * 1000)
+            val years = dateTime.get(Calendar.YEAR)
+            val months = dateTime.get(Calendar.MONTH)
+            return 12 * years + months
+        }
+
+        // convert month to seconds since epoch
+        fun monthsToUnix(months: Int): Long {
+            dateTime.time = Date(0)
+            dateTime.set(Calendar.YEAR, months / 12)
+            dateTime.set(Calendar.MONTH, months % 12)
+            dateTime.set(Calendar.HOUR, 0)
+            dateTime.set(Calendar.MINUTE, 0)
+            dateTime.set(Calendar.SECOND, 0)
+            return dateTime.time.time / 1000
+        }
+
+        // convert seconds to weeks since epoch
+        fun unixToWeeks(seconds: Long): Int {
+            dateTime.time = Date(seconds * 1000)
+            val years = dateTime.get(Calendar.YEAR) - 1970
+            val weeks = dateTime.get(Calendar.WEEK_OF_YEAR)
+            val month = dateTime.get(Calendar.MONTH) + 1 // month starts at 0
+
+            if (month == 12 && weeks == 1) {
+                // The first week if the year might start in the previous year.
+                return 52 * (years + 1) + weeks
+            }
+
+            return 52 * years + weeks
+        }
+
+        // convert weeks to seconds since epoch
+        fun weeksToUnix(weeks: Int): Long {
+            dateTime.time = Date(0)
+            dateTime.set(Calendar.YEAR, 1970 + weeks / 52)
+            dateTime.set(Calendar.WEEK_OF_YEAR, weeks % 52)
+            dateTime.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY)
+            dateTime.set(Calendar.HOUR, 0)
+            dateTime.set(Calendar.MINUTE, 0)
+            dateTime.set(Calendar.SECOND, 0)
+            return dateTime.time.time / 1000
+        }
+
+        // convert seconds to days since epoch
+        fun unixToDays(seconds: Long): Int {
+            dateTime.time = Date(seconds * 1000)
+            val years = dateTime.get(Calendar.YEAR)
+            val days = dateTime.get(Calendar.DAY_OF_YEAR)
+            return 365 * years + days
+        }
+
+        // convert days to seconds since epoch
+        fun daysToUnix(days: Int): Long {
+            dateTime.time = Date(0)
+            dateTime.set(Calendar.YEAR, days / 365)
+            dateTime.set(Calendar.DAY_OF_YEAR, days % 365)
+            dateTime.set(Calendar.HOUR, 0)
+            dateTime.set(Calendar.MINUTE, 0)
+            dateTime.set(Calendar.SECOND, 0)
+            return dateTime.time.time / 1000
+        }
+
+        fun appendToFloatArray(array: FloatArray, vararg values: Float): FloatArray {
+            // create new array
+            val newArray = FloatArray(array.size + values.size)
+            // copy old values
+            for (i in array.indices) {
+                newArray[i] = array[i]
+            }
+            // add new values
+            for (i in values.indices) {
+                newArray[array.size + i] = values[i]
+            }
+            return newArray
+        }
+
+        // for debugging
+        fun debugBarValues(values: ArrayList<BarEntry>) {
+            for (value in values) {
+                val yVals = value.yVals
+                if (yVals != null) {
+                    val y = yVals.fold(0F) { acc, next -> acc + next }
+                    val yVals = yVals.joinToString { it.toString() }
+                    Log.d(TAG, "value: ${value.x} $y ($yVals)")
+                } else {
+                    Log.d(TAG, "value: ${value.x} ${value.y}")
+                }
+            }
+        }
+    }
+}

app/src/main/java/it/danieleverducci/lunatracker/adapters/LunaEventRecyclerAdapter.kt

@@ -58,7 +58,12 @@ class LunaEventRecyclerAdapter: RecyclerView.Adapter<LunaEventRecyclerAdapter.Lu
             LunaEvent.Type.NOTE -> item.notes
             else -> item.getRowItemTitle(context)
         }
-        holder.time.text = DateUtils.formatTimeAgo(context, item.getEndTime())
+        val endTime = if (item.type == LunaEvent.Type.SLEEP) {
+            item.quantity + item.time
+        } else {
+            item.time
+        }
+        holder.time.text = DateUtils.formatTimeAgo(context, endTime)
         var quantityText = numericUtils.formatEventQuantity(item)
 
         // if the event is weight, show difference with the last one

app/src/main/java/it/danieleverducci/lunatracker/entities/LunaEvent.kt

@@ -115,18 +115,6 @@ class LunaEvent: Comparable<LunaEvent> {
         return getDialogMessage(context, type)
     }
 
-    fun getStartTime(): Long {
-        return time
-    }
-
-    fun getEndTime(): Long {
-        return if (type == Type.SLEEP) {
-            time + quantity
-        } else {
-            time
-        }
-    }
-
     fun toJson(): JSONObject {
         return jo
     }

app/src/main/java/utils/DateUtils.kt

@@ -56,11 +56,11 @@ class DateUtils {
                 return builder.toString()
             }
 
-            if (years != 0L) {
+            if (years > 0) {
                 return format(years, days, R.string.year_ago, R.string.years_ago, R.string.day_ago, R.string.days_ago)
-            } else if (days != 0L) {
+            } else if (days > 0) {
                 return format(days, hours, R.string.day_ago, R.string.days_ago, R.string.hour_ago, R.string.hours_ago)
-            } else if (hours != 0L) {
+            } else if (hours > 0) {
                 return format(hours, minutes, R.string.hour_ago, R.string.hours_ago, R.string.minute_ago, R.string.minutes_ago)
             } else {
                 return format(minutes, seconds, R.string.minute_ago, R.string.minute_ago, R.string.second_ago, R.string.seconds_ago)

app/src/main/res/layout/activity_statistics.xml

@@ -0,0 +1,50 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    android:padding="10dp">
+
+    <FrameLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_weight="1">
+
+        <com.github.mikephil.charting.charts.HorizontalBarChart
+            android:id="@+id/bar_chart"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent" />
+
+        <TextView
+            android:id="@+id/no_data"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:visibility="gone"
+            android:gravity="center"
+            android:text="@string/statistics_no_data"/>
+
+    </FrameLayout>
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_weight="0"
+        android:orientation="horizontal">
+
+        <Spinner
+            android:id="@+id/graph_type_selection"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:gravity="center"/>
+
+        <Spinner
+            android:id="@+id/time_range_selection"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:gravity="center"/>
+
+    </LinearLayout>
+
+</LinearLayout>

app/src/main/res/layout/dialog_edit_duration.xml

@@ -7,23 +7,47 @@
     android:gravity="center"
     android:orientation="vertical">
 
-    <TextView
-        android:id="@+id/dialog_date_picker_begin"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:layout_gravity="center"
-        android:layout_marginTop="10dp"/>
-
     <TextView
         android:id="@+id/dialog_date_duration"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:layout_marginTop="20dp"
         android:textSize="20sp"
         android:text="💤"/>
 
+    <LinearLayout
+        android:id="@+id/duration_buttons"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:gravity="center"
+        android:layout_marginTop="20dp"
+        android:layout_marginHorizontal="10dp"
+        android:orientation="horizontal">
+
+        <Button
+            android:id="@+id/dialog_date_duration_minus5"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:text="-5"/>
+
+        <Button
+            android:id="@+id/dialog_date_duration_now"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:text="@string/now"/>
+
+        <Button
+            android:id="@+id/dialog_date_duration_plus5"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:text="+5"/>
+
+    </LinearLayout>
+
     <TextView
-        android:id="@+id/dialog_date_picker_end"
+        android:id="@+id/dialog_date_picker"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_gravity="center"

app/src/main/res/layout/more_events_popup.xml

@@ -10,7 +10,17 @@
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:orientation="vertical">
-                <!-- Buttons are inserted dynamically -->
+
+            <TextView
+                android:id="@+id/button_statistics"
+                android:layout_width="match_parent"
+                android:layout_height="match_parent"
+                android:padding="10dp"
+                android:background="@drawable/dropdown_list_item_background"
+                style="@style/OverflowMenuText"
+                android:text="📊 Statistics"/>
+
+                <!-- Other buttons are inserted dynamically -->
     </LinearLayout>
 
 </ScrollView>

app/src/main/res/values/arrays.xml

@@ -6,4 +6,34 @@
         <item>@string/amount_normal</item>
         <item>@string/amount_plenty</item>
     </string-array>
+
+    <string-array name="StatisticsTypeLabels">
+        <item>@string/statistics_bottle_sum</item>
+        <item>@string/statistics_bottle_events</item>
+        <item>@string/statistics_sleep_sum</item>
+        <item>@string/statistics_sleep_events</item>
+        <item>@string/statistics_sleep_pattern</item>
+        <item>@string/statistics_medicine_events</item>
+    </string-array>
+
+    <string-array name="StatisticsTypeValues">
+        <item>BOTTLE_SUM</item>
+        <item>BOTTLE_EVENTS</item>
+        <item>SLEEP_SUM</item>
+        <item>SLEEP_EVENTS</item>
+        <item>SLEEP_PATTERN</item>
+        <item>MEDICINE_EVENTS</item>
+    </string-array>
+
+    <string-array name="StatisticsTimeLabels">
+        <item>Day</item>
+        <item>Week</item>
+        <item>Month</item>
+    </string-array>
+
+    <string-array name="StatisticsTimeValues">
+        <item>DAY</item>
+        <item>WEEK</item>
+        <item>MONTH</item>
+    </string-array>
 </resources>

app/src/main/res/values/strings.xml

@@ -88,6 +88,9 @@
     <string name="no_connection_go_to_settings">Settings</string>
     <string name="no_connection_retry">Retry</string>
 
+    <string name="statistics_title">Statistics</string>
+    <string name="statistics_no_data">No Data</string>
+
     <string name="settings_dynamic_menu">Dynamic Menu</string>
     <string name="settings_dynamic_menu_desc">Populate the header menu with the most used events.</string>
     <string name="settings_title">Settings</string>
@@ -138,6 +141,13 @@
     <string name="measurement_unit_temperature_base_imperial" translatable="false">°F</string>
     <string name="measurement_unit_temperature_base_metric" translatable="false">°C</string>
 
+    <string name="statistics_bottle_events">Bottle Events</string>
+    <string name="statistics_bottle_sum">Bottle Per Day</string>
+    <string name="statistics_medicine_events">Medicine Events</string>
+    <string name="statistics_sleep_sum">Sleep Per Day</string>
+    <string name="statistics_sleep_events">Sleep Events</string>
+    <string name="statistics_sleep_pattern">Sleep Pattern</string>
+
     <string name="row_luna_event_description">Description</string>
     <string name="row_luna_event_quantity">Qty</string>
     <string name="row_luna_event_time">Time</string>

gradle/libs.versions.toml

@@ -9,6 +9,8 @@ lifecycleRuntimeKtx = "2.6.1"
 activityCompose = "1.8.0"
 composeBom = "2024.04.01"
 appcompat = "1.7.0"
+mpandroidchart = "v4.2.2"
+mpandroidchartVersion = "v3.1.0"
 recyclerview = "1.3.2"
 material = "1.12.0"
 sardineAndroid = "v0.9"
@@ -31,6 +33,8 @@ androidx-ui-test-junit4 = { group = "androidx.compose.ui", name = "ui-test-junit
 androidx-material3 = { group = "androidx.compose.material3", name = "material3" }
 androidx-appcompat = { group = "androidx.appcompat", name = "appcompat", version.ref = "appcompat" }
 material = { group = "com.google.android.material", name = "material", version.ref = "material" }
+mpandroidchart = { module = "com.github.PhilJay:MPAndroidChart", version.ref = "mpandroidchart" }
+mpandroidchart-vv310 = { module = "com.github.PhilJay:MPAndroidChart", version.ref = "mpandroidchartVersion" }
 sardine-android = { module = "com.github.thegrizzlylabs:sardine-android", version.ref = "sardineAndroid" }
 
 [plugins]