add statistics for bottle and sleep events

An unspecified amount has also been added
to have the same semantics as before.

During these actions, the strings for title
and description of dialogs have been cleaned up.

app/build.gradle.kts

@@ -60,4 +60,5 @@ 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

@@ -6,6 +6,7 @@ import android.content.DialogInterface
 import android.content.Intent
 import android.os.Bundle
 import android.os.Handler
+import android.text.Editable
 import android.util.Log
 import android.view.LayoutInflater
 import android.view.View
@@ -50,6 +51,8 @@ class MainActivity : AppCompatActivity() {
         const val TAG = "MainActivity"
         const val UPDATE_EVERY_SECS: Long = 30
         const val DEBUG_CHECK_LOGBOOK_CONSISTENCY = false
+        // list of all events
+        var allEvents = arrayListOf<LunaEvent>()
     }
 
     var logbook: Logbook? = null
@@ -145,7 +148,8 @@ class MainActivity : AppCompatActivity() {
         if (logbook == null)
             Log.w(TAG, "showLogbook(): logbook is null!")
 
-        setListAdapter(logbook?.logs ?: arrayListOf())
+        allEvents = logbook?.logs ?: arrayListOf()
+        setListAdapter(allEvents)
     }
 
     override fun onStart() {
@@ -192,10 +196,6 @@ class MainActivity : AppCompatActivity() {
         super.onStop()
     }
 
-    fun getAllEvents(): ArrayList<LunaEvent> {
-        return logbook?.logs ?: arrayListOf()
-    }
-
     fun addBabyBottleEvent(event: LunaEvent) {
         setToPreviousQuantity(event)
         askBabyBottleContent(event, true) {
@@ -363,7 +363,7 @@ class MainActivity : AppCompatActivity() {
     }
 
     fun saveEvent(event: LunaEvent) {
-        if (!getAllEvents().contains(event)) {
+        if (!allEvents.contains(event)) {
             // new event
             logEvent(event)
         }
@@ -387,9 +387,7 @@ class MainActivity : AppCompatActivity() {
         val durationTextView = dialogView.findViewById<TextView>(R.id.dialog_date_duration)
         val durationNowButton = dialogView.findViewById<Button>(R.id.dialog_date_duration_now)
         val datePicker = dialogView.findViewById<TextView>(R.id.dialog_date_picker)
-        val durationMinus15Button = dialogView.findViewById<Button>(R.id.dialog_date_duration_minus15)
         val durationMinus5Button = dialogView.findViewById<Button>(R.id.dialog_date_duration_minus5)
-        val durationPlus15Button = dialogView.findViewById<Button>(R.id.dialog_date_duration_plus15)
         val durationPlus5Button = dialogView.findViewById<Button>(R.id.dialog_date_duration_plus5)
 
         val currentDurationTextColor = durationTextView.currentTextColor
@@ -428,10 +426,8 @@ class MainActivity : AppCompatActivity() {
             onDateChange(pickedDateTime.time.time / 1000)
         }
 
-        durationMinus15Button.setOnClickListener { adjust(-15) }
         durationMinus5Button.setOnClickListener { adjust(-5) }
         durationPlus5Button.setOnClickListener { adjust(5) }
-        durationPlus15Button.setOnClickListener { adjust(15) }
 
         durationNowButton.setOnClickListener {
             val now = Calendar.getInstance().time.time / 1000
@@ -561,7 +557,7 @@ class MainActivity : AppCompatActivity() {
 
         val nextTextView = dialogView.findViewById<TextView>(R.id.notes_template_next)
         val prevTextView = dialogView.findViewById<TextView>(R.id.notes_template_prev)
-        val templates = getAllEvents().filter { it.type == event.type }.distinctBy { it.notes.trim() }.sortedBy { it.time }
+        val templates = allEvents.filter { it.type == event.type }.distinctBy { it.notes }.sortedBy { it.time }
 
         fun updateContent(current: LunaEvent) {
             val prevEvent = getPreviousSameEvent(current, templates)
@@ -616,7 +612,7 @@ class MainActivity : AppCompatActivity() {
         updateContent(event)
 
         d.setPositiveButton(android.R.string.ok) { dialogInterface, i ->
-            val notes = notesET.text.toString()
+            val notes = notesET.text.toString().trim()
 
             if (useQuantity) {
                 val quantity = qtyET.text.toString().toIntOrNull()
@@ -667,7 +663,7 @@ class MainActivity : AppCompatActivity() {
     }
 
     fun setToPreviousQuantity(event: LunaEvent) {
-        val prev = getPreviousSameEvent(event, getAllEvents())
+        val prev = getPreviousSameEvent(event, allEvents)
         if (prev != null) {
             event.quantity = prev.quantity
         }
@@ -704,6 +700,12 @@ class MainActivity : AppCompatActivity() {
     fun showEventDetailDialog(originalEvent: LunaEvent) {
         val event = LunaEvent(originalEvent)
 
+        fun eventValuesChanged(): Boolean {
+            return (event.time != originalEvent.time
+                || event.quantity != originalEvent.quantity
+                || event.notes != originalEvent.notes)
+        }
+
         // Do not update list while the detail is shown, to avoid changing the object below while it is changed by the user
         pauseLogbookUpdate = true
 
@@ -714,19 +716,70 @@ class MainActivity : AppCompatActivity() {
         val emojiTextView = dialogView.findViewById<TextView>(R.id.dialog_event_detail_type_emoji)
         val descriptionTextView = dialogView.findViewById<TextView>(R.id.dialog_event_detail_type_description)
         val dateTextView = dialogView.findViewById<TextView>(R.id.dialog_event_detail_type_date)
+        val dateEndTextView = dialogView.findViewById<TextView>(R.id.dialog_event_detail_type_date_end)
         val quantityTextView = dialogView.findViewById<TextView>(R.id.dialog_event_detail_type_quantity)
         val notesTextView = dialogView.findViewById<TextView>(R.id.dialog_event_detail_type_notes)
 
         emojiTextView.text = event.getTypeEmoji(this)
         descriptionTextView.text = event.getTypeDescription(this)
 
-        val pickedTime = datePickerHelper(event.time, dateTextView)
+        d.setView(dialogView)
+
+        d.setNeutralButton(R.string.dialog_event_detail_delete_button) { dialogInterface, i ->
+            deleteEvent(originalEvent)
+            dialogInterface.dismiss()
+        }
+
+        d.setNegativeButton(R.string.dialog_event_detail_save_button) { dialogInterface, i ->
+            if (eventValuesChanged()) {
+                originalEvent.time = event.time
+                originalEvent.quantity = event.quantity
+                originalEvent.notes = event.notes
+                saveEvent(originalEvent)
+            }
+
+            dialogInterface.dismiss()
+        }
+
+        d.setPositiveButton(R.string.dialog_event_detail_close_button) { dialogInterface, i ->
+            dialogInterface.dismiss()
+        }
+
+        val alertDialog = d.create()
+        alertDialog.show()
+
+        alertDialog.getButton(DialogInterface.BUTTON_NEUTRAL).setTextColor(
+            ContextCompat.getColor(this, R.color.danger)
+        )
+
+        alertDialog.setOnDismissListener {
+            // Resume logbook update
+            pauseLogbookUpdate = false
+        }
+
         val updateValues = {
             quantityTextView.text = NumericUtils(this).formatEventQuantity(event)
             notesTextView.text = event.notes
+            if (event.type == LunaEvent.TYPE_SLEEP && event.quantity > 0) {
+                dateEndTextView.text = DateUtils.formatDateTime(event.time + event.quantity)
+                dateEndTextView.visibility = View.VISIBLE
+            } else {
+                dateEndTextView.visibility = View.GONE
+            }
+
+            alertDialog.getButton(DialogInterface.BUTTON_NEGATIVE).visibility = if (eventValuesChanged()) {
+                View.VISIBLE
+            } else {
+                View.GONE
+            }
         }
         updateValues()
 
+        datePickerHelper(event.time, dateTextView, { newTime: Long ->
+            event.time = newTime
+            updateValues()
+        })
+
         quantityTextView.setOnClickListener {
             when (event.type) {
                 LunaEvent.TYPE_BABY_BOTTLE -> askBabyBottleContent(event, false, updateValues)
@@ -748,40 +801,6 @@ class MainActivity : AppCompatActivity() {
             }
         }
 
-        d.setView(dialogView)
-
-        d.setNeutralButton(R.string.dialog_event_detail_delete_button) { dialogInterface, i ->
-            deleteEvent(originalEvent)
-            dialogInterface.dismiss()
-        }
-
-        d.setPositiveButton(R.string.dialog_event_detail_close_button) { dialogInterface, i ->
-            event.time = pickedTime.time.time / 1000
-
-            if (event.time != originalEvent.time
-                    || event.quantity != originalEvent.quantity
-                    || event.notes != originalEvent.notes) {
-                originalEvent.time = event.time
-                originalEvent.quantity = event.quantity
-                originalEvent.notes = event.notes
-                saveEvent(originalEvent)
-            }
-
-            dialogInterface.dismiss()
-        }
-
-        val alertDialog = d.create()
-        alertDialog.show()
-
-        alertDialog.getButton(DialogInterface.BUTTON_NEUTRAL).setTextColor(
-            ContextCompat.getColor(this, R.color.danger)
-        )
-
-        alertDialog.setOnDismissListener {
-            // Resume logbook update
-            pauseLogbookUpdate = false
-        }
-
         // show optional signature
         if (event.signature.isNotEmpty()) {
             val signatureTextEdit = dialogView.findViewById<TextView>(R.id.dialog_event_detail_type_signature)
@@ -789,8 +808,6 @@ class MainActivity : AppCompatActivity() {
             signatureTextEdit.visibility = View.VISIBLE
         }
 
-        val allEvents = getAllEvents()
-
         // create link to prevent event of the same type
         val previousTextView = dialogView.findViewById<TextView>(R.id.dialog_event_previous)
         val previousEvent = getPreviousSameEvent(event, allEvents)
@@ -1210,6 +1227,16 @@ class MainActivity : AppCompatActivity() {
                 addPlainEvent(LunaEvent(LunaEvent.TYPE_BATH))
                 dismiss()
             }
+            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()
+            }
         }.also { popupWindow ->
             popupWindow.setOnDismissListener({
                 Handler(mainLooper).postDelayed({

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

@@ -0,0 +1,375 @@
+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 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.formatter.ValueFormatter
+import com.github.mikephil.charting.interfaces.datasets.IBarDataSet
+import it.danieleverducci.lunatracker.entities.LunaEvent
+import utils.DateUtils.Companion.formatTimeDuration
+import utils.NumericUtils
+import java.util.Calendar
+import java.util.Date
+import kotlin.math.max
+import kotlin.math.min
+
+class StatisticsActivity :  AppCompatActivity() {
+    lateinit var barChart: BarChart
+    lateinit var noDataTextView: TextView
+    lateinit var eventTypeSelection: Spinner
+    lateinit var dataTypeSelection: Spinner
+    lateinit var timeRangeSelection: Spinner
+
+    // default selection
+    var eventTypeSelectionValue = "BOTTLE"
+    var dataTypeSelectionValue = "AMOUNT"
+    var timeRangeSelectionValue = "DAY"
+
+    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)
+
+        eventTypeSelection = findViewById(R.id.type_selection)
+        dataTypeSelection = findViewById(R.id.data_selection)
+        timeRangeSelection = findViewById(R.id.time_selection)
+
+        setupSpinner(eventTypeSelectionValue,
+            R.id.type_selection,
+            R.array.StatisticsTypeLabels,
+            R.array.StatisticsTypeValues,
+            object : SpinnerItemSelected {
+                override fun call(newValue: String?) {
+                    if (newValue != null) {
+                        eventTypeSelectionValue = newValue
+                        //Log.d("event", "new value: $newValue")
+                        updateGraph()
+                    }
+                }
+            }
+        )
+
+        setupSpinner(dataTypeSelectionValue,
+            R.id.data_selection,
+            R.array.StatisticsDataLabels,
+            R.array.StatisticsDataValues,
+            object : SpinnerItemSelected {
+                override fun call(newValue: String?) {
+                    if (newValue != null) {
+                        dataTypeSelectionValue = newValue
+                        //Log.d("event", "new value: $newValue")
+                        updateGraph()
+                    }
+                }
+            }
+        )
+
+        setupSpinner(timeRangeSelectionValue,
+            R.id.time_selection,
+            R.array.StatisticsTimeLabels,
+            R.array.StatisticsTimeValues,
+            object : SpinnerItemSelected {
+                override fun call(newValue: String?) {
+                    if (newValue != null) {
+                        timeRangeSelectionValue = newValue
+                        //Log.d("event", "new value: $newValue")
+                        updateGraph()
+                    }
+                }
+            }
+        )
+
+       updateGraph()
+    }
+
+    fun updateGraph() {
+        val eventType = when (eventTypeSelectionValue) {
+            "BOTTLE" -> LunaEvent.TYPE_BABY_BOTTLE
+            "SLEEP" -> LunaEvent.TYPE_SLEEP
+            else -> {
+                Log.e(TAG, "unhandled eventTypeSelectionValue: $eventTypeSelectionValue")
+                return
+            }
+        }
+        val allEvents = MainActivity.allEvents.filter { it.type == eventType }.sortedBy { it.time }
+
+        val values = ArrayList<BarEntry>()
+        val labels = ArrayList<String>()
+
+        val unixToSpan  = when (timeRangeSelectionValue) {
+            "DAY" -> { unix: Long -> unixToDays(unix) }
+            "WEEK" -> { unix: Long -> unixToWeeks(unix) }
+            "MONTH" -> { unix: Long -> unixToMonths(unix) }
+            else -> {
+                Log.e(TAG, "Invalid timeRangeSelectionValue: $timeRangeSelectionValue")
+                return
+            }
+        }
+
+        val spanToUnix = when (timeRangeSelectionValue) {
+            "DAY" -> { span: Int -> daysToUnix(span) }
+            "WEEK" -> { span: Int -> weeksToUnix(span) }
+            "MONTH" -> { span: Int ->  monthsToUnix(span) }
+            else -> {
+                Log.e(TAG, "Invalid timeRangeSelectionValue: $timeRangeSelectionValue")
+                return
+            }
+        }
+
+        fun spanToLabel(span: Int): String {
+            val dateTime = Calendar.getInstance()
+            dateTime.time = Date(1000 * spanToUnix(span))
+            val year = dateTime.get(Calendar.YEAR)
+            val month = dateTime.get(Calendar.MONTH) + 1 // month starts at 0
+            val week = dateTime.get(Calendar.WEEK_OF_YEAR)
+            val day = dateTime.get(Calendar.DAY_OF_MONTH)
+            return when (timeRangeSelectionValue) {
+                "DAY" -> "$day/$month/$year"
+                "WEEK" -> "$week/$year"
+                "MONTH" -> "$month/$year"
+                else -> {
+                    Log.e(TAG, "Invalid timeRangeSelectionValue: $timeRangeSelectionValue")
+                    "?"
+                }
+            }
+        }
+
+        if (allEvents.isNotEmpty()) {
+            barChart.visibility = View.VISIBLE
+            noDataTextView.visibility = View.GONE
+
+            // unix time span of all events
+            val startUnix = allEvents.minOf { it.getStartTime() }
+            val endUnix = allEvents.maxOf { it.getEndTime() }
+
+            // convert to days, weeks or months
+            val startSpan = unixToSpan(startUnix)
+            val endSpan = unixToSpan(endUnix)
+
+            //Log.d(TAG, "startUnix: $startUnix (${Date(1000 * startUnix)}), startSpan: $startSpan (${Date(1000 * spanToUnix(startSpan))}), endUnix: $endUnix (${Date(1000 * endUnix)}), endSpan: $endSpan (${Date(1000 * spanToUnix(endSpan))})")
+            for (span in startSpan..endSpan) {
+                values.add(BarEntry(values.size.toFloat(), 0F))
+                labels.add(spanToLabel(span))
+            }
+
+            for (event in allEvents) {
+                if (dataTypeSelectionValue == "AMOUNT") {
+                    if (eventTypeSelectionValue == "SLEEP") {
+                        // a sleep event can span to another day
+                        // distribute sleep time over the days
+                        val startUnix = event.getStartTime()
+                        val endUnix = event.getEndTime()
+                        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) {
+                            val spanBegin = spanToUnix(i)
+                            val spanEnd =  spanToUnix(i + 1)
+                            //Log.d(TAG, "mid: ${Date(mid * 1000)}, spanBegin: ${Date(spanBegin * 1000)}, spanEnd: ${Date(spanEnd * 1000)}, endUnix: ${Date(endUnix * 1000)}")
+                            val beg = max(mid, spanBegin)
+                            val end = min(endUnix, spanEnd)
+                            val index = i - startSpan
+                            val duration = end - beg
+                            //Log.d(TAG, "[$index] beg: ${Date(beg * 1000)}, end: ${Date(end * 1000)}, ${formatTimeDuration(this, duration)}")
+
+                            values[index].y += duration
+                            mid = end
+                        }
+                    } else {
+                        val index = unixToSpan(event.time) - startSpan
+                        //Log.d(TAG, "[${index}] ${event.quantity}")
+                        values[index].y += event.quantity
+                    }
+                } else {
+                    val index = unixToSpan(event.time) - startSpan
+                    values[index].y += 1
+                }
+            }
+        } else {
+            barChart.visibility = View.GONE
+            noDataTextView.visibility = View.VISIBLE
+        }
+
+        barChart.xAxis.setLabelCount(min(values.size, 24))
+
+        val set1 = BarDataSet(values, "")
+
+        set1.setDrawValues(true)
+        set1.setDrawIcons(false)
+
+        val dataSets = ArrayList<IBarDataSet?>()
+        dataSets.add(set1)
+
+        val data = BarData(dataSets)
+
+        data.setValueFormatter(object : ValueFormatter() {
+            override fun getFormattedValue(value: Float): String {
+                //Log.d(TAG, "getFormattedValue ${dataTypeSelectionValue} ${eventTypeSelectionValue}")
+                return when (dataTypeSelectionValue) {
+                    "EVENT" -> value.toInt().toString()
+                    "AMOUNT" -> when (eventTypeSelectionValue) {
+                        "BOTTLE" -> NumericUtils(applicationContext).formatEventQuantity(LunaEvent.TYPE_BABY_BOTTLE, value.toInt())
+                        "SLEEP" -> NumericUtils(applicationContext).formatEventQuantity(LunaEvent.TYPE_SLEEP, value.toInt())
+                        else -> {
+                            Log.e(TAG, "unhandled eventTypeSelectionValue: $eventTypeSelectionValue")
+                            value.toInt().toString()
+                        }
+                    } else -> {
+                        Log.e(TAG, "unhandled dataTypeSelectionValue: $dataTypeSelectionValue")
+                        value.toInt().toString()
+                    }
+                }
+            }
+        })
+
+        barChart.xAxis.valueFormatter = object: ValueFormatter() {
+            override fun getFormattedValue(value: Float): String {
+                return labels.getOrElse(value.toInt(), {"?"})
+            }
+        }
+
+        data.setValueTextSize(12f)
+        barChart.setData(data)
+        barChart.invalidate()
+    }
+
+    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) //android.R.layout.simple_spinner_item) //android.R.layout.simple_list_item_single_choice) //R.layout.spinner_item_settings)
+
+        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"
+
+        fun unixToMonths(seconds: Long): Int {
+            val dateTime = Calendar.getInstance()
+            dateTime.time = Date(seconds * 1000)
+            val years = dateTime.get(Calendar.YEAR)
+            val months = dateTime.get(Calendar.MONTH)
+            return 12 * years + months
+        }
+
+        fun monthsToUnix(months: Int): Long {
+            val dateTime = Calendar.getInstance()
+            dateTime.time = Date(0)
+            dateTime.set(Calendar.YEAR, months / 12)
+            dateTime.set(Calendar.MONTH, months % 12)
+            //Calendar.MONTH_OF_YEAR?
+            dateTime.set(Calendar.HOUR, 0)
+            dateTime.set(Calendar.MINUTE, 0)
+            dateTime.set(Calendar.SECOND, 0)
+            return dateTime.time.time / 1000
+        }
+
+        fun unixToWeeks(seconds: Long): Int {
+            val dateTime = Calendar.getInstance()
+            dateTime.time = Date(seconds * 1000)
+            val years = dateTime.get(Calendar.YEAR)
+            val weeks = dateTime.get(Calendar.WEEK_OF_YEAR)
+            return 52 * years + weeks
+        }
+
+        fun weeksToUnix(weeks: Int): Long {
+            val dateTime = Calendar.getInstance()
+            dateTime.time = Date(0)
+            dateTime.set(Calendar.YEAR, 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
+        }
+
+        fun unixToDays(seconds: Long): Int {
+            val dateTime = Calendar.getInstance()
+            dateTime.time = Date(seconds * 1000)
+            val years = dateTime.get(Calendar.YEAR)
+            val days = dateTime.get(Calendar.DAY_OF_YEAR)
+            return 365 * years + days
+        }
+
+        // convert from days to Date
+        fun daysToUnix(days: Int): Long {
+            val dateTime = Calendar.getInstance()
+            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
+        }
+    }
+}

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

@@ -59,7 +59,7 @@ class LunaEventRecyclerAdapter: RecyclerView.Adapter<LunaEventRecyclerAdapter.Lu
             LunaEvent.TYPE_CUSTOM -> item.notes
             else -> item.getTypeDescription(context)
         }
-        holder.time.text = DateUtils.formatTimeAgo(context, item.time)
+        holder.time.text = DateUtils.formatTimeAgo(context, item.getEndTime())
         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

@@ -94,6 +94,18 @@ class LunaEvent: Comparable<LunaEvent> {
         this.quantity = quantity
     }
 
+    fun getStartTime(): Long {
+        return time
+    }
+
+    fun getEndTime(): Long {
+        return if (type == TYPE_SLEEP) {
+            time + quantity
+        } else {
+            time
+        }
+    }
+
     fun getTypeEmoji(context: Context): String {
         return context.getString(
             when (type) {

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

@@ -63,28 +63,31 @@ class NumericUtils (val context: Context) {
     }
 
     fun formatEventQuantity(event: LunaEvent): String {
+        return formatEventQuantity(event.type, event.quantity)
+    }
+
+    fun formatEventQuantity(type: String, quantity: Int): String {
         val formatted = StringBuilder()
-        if (event.quantity > 0) {
-            formatted.append(when (event.type) {
+        if (quantity > 0) {
+            formatted.append(when (type) {
                 LunaEvent.TYPE_TEMPERATURE ->
-                    (event.quantity / 10.0f).toString()
+                    (quantity / 10.0f).toString()
                 LunaEvent.TYPE_DIAPERCHANGE_POO,
                 LunaEvent.TYPE_DIAPERCHANGE_PEE,
                 LunaEvent.TYPE_PUKE -> {
                     val array = context.resources.getStringArray(R.array.AmountLabels)
-                    return array.getOrElse(event.quantity) {
-                        Log.e("NumericUtils", "Invalid index ${event.quantity}")
+                    return array.getOrElse(quantity) {
+                        Log.e("NumericUtils", "Invalid index $quantity")
                         return ""
                     }
                 }
-                LunaEvent.TYPE_SLEEP -> formatTimeDuration(context, event.quantity.toLong())
-                else ->
-                    event.quantity
+                LunaEvent.TYPE_SLEEP -> formatTimeDuration(context, quantity.toLong())
+                else -> quantity
             })
 
             formatted.append(" ")
             formatted.append(
-                when (event.type) {
+                when (type) {
                     LunaEvent.TYPE_BABY_BOTTLE -> measurement_unit_liquid_base
                     LunaEvent.TYPE_WEIGHT -> measurement_unit_weight_base
                     LunaEvent.TYPE_MEDICINE -> measurement_unit_weight_tiny
@@ -93,7 +96,7 @@ class NumericUtils (val context: Context) {
                 }
             )
         } else {
-            formatted.append(when (event.type) {
+            formatted.append(when (type) {
                 LunaEvent.TYPE_SLEEP -> "💤" // baby is sleeping
                 else -> ""
             })

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

@@ -0,0 +1,55 @@
+<?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="No Data"/>
+
+    </FrameLayout>
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_weight="0"
+        android:layout_marginTop="10dp"
+        android:orientation="horizontal">
+
+        <Spinner
+            android:id="@+id/type_selection"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_weight="1" />
+
+        <Spinner
+            android:id="@+id/data_selection"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"/>
+
+        <Spinner
+            android:id="@+id/time_selection"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"/>
+
+    </LinearLayout>
+
+</LinearLayout>

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

@@ -11,8 +11,7 @@
         android:id="@+id/dialog_amount_value"
         android:layout_width="250dp"
         android:layout_height="wrap_content"
-        android:paddingHorizontal="16dp"
-        android:paddingVertical="8dp"/>
+        android:paddingHorizontal="16dp"/>
 
     <TextView
         android:id="@+id/dialog_date_picker"

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

@@ -22,13 +22,6 @@
         android:layout_marginHorizontal="10dp"
         android:orientation="horizontal">
 
-        <Button
-            android:id="@+id/dialog_date_duration_minus15"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:text="-15"/>
-
         <Button
             android:id="@+id/dialog_date_duration_minus5"
             android:layout_width="wrap_content"
@@ -50,13 +43,6 @@
             android:layout_weight="1"
             android:text="+5"/>
 
-        <Button
-            android:id="@+id/dialog_date_duration_plus15"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:text="+15"/>
-
     </LinearLayout>
 
     <TextView

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

@@ -52,6 +52,6 @@
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_gravity="center"
-        android:layout_marginTop="20dp"/>
+        android:layout_marginTop="15dp"/>
 
 </LinearLayout>

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

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:orientation="vertical"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
@@ -46,6 +45,18 @@
         android:textSize="28sp"
         android:text="@string/dialog_event_detail_quantity"/>
 
+    <TextView
+        android:id="@+id/dialog_event_detail_type_date_end"
+        android:layout_width="wrap_content"
+        android:layout_height="40dp"
+        android:layout_gravity="center_horizontal"
+        android:gravity="center_vertical"
+        android:drawablePadding="10dp"
+        android:drawableTint="@color/accent"
+        android:visibility="gone"
+        android:textSize="16sp"
+        android:textStyle="bold"/>
+
     <ScrollView
         android:layout_width="match_parent"
         android:layout_height="200dp"

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

@@ -10,10 +10,21 @@
         android:layout_height="wrap_content"
         android:orientation="vertical">
 
+            <TextView
+                android:id="@+id/button_statistics"
+                android:layout_width="match_parent"
+                android:layout_height="match_parent"
+                android:layout_marginTop="10dp"
+                android:padding="10dp"
+                android:background="@drawable/dropdown_list_item_background"
+                style="@style/OverflowMenuText"
+                android:text="📊 Statistics"/>
+
             <TextView
                 android:id="@+id/button_medicine"
                 android:layout_width="match_parent"
                 android:layout_height="match_parent"
+                android:layout_marginTop="10dp"
                 android:padding="10dp"
                 android:background="@drawable/dropdown_list_item_background"
                 style="@style/OverflowMenuText"

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

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<TextView  
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent" 
+    android:layout_height="wrap_content"
+    android:textSize="20sp"
+    android:gravity="center"
+    android:padding="5dip" />

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

@@ -6,4 +6,37 @@
         <item>@string/amount_normal</item>
         <item>@string/amount_plenty</item>
     </string-array>
+
+    <string-array name="StatisticsTypeLabels">
+        <item>Bottle</item>
+        <item>Sleep</item>
+    </string-array>
+
+    <string-array name="StatisticsTypeValues">
+        <item>BOTTLE</item>
+        <item>SLEEP</item>
+    </string-array>
+
+    <string-array name="StatisticsDataLabels">
+        <item>Event</item>
+        <item>Amount</item>
+    </string-array>
+
+    <string-array name="StatisticsDataValues">
+        <item>EVENT</item>
+        <item>AMOUNT</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

@@ -77,6 +77,8 @@
     <string name="no_connection_go_to_settings">Settings</string>
     <string name="no_connection_retry">Retry</string>
 
+    <string name="statistics_title">Statistics</string>
+
     <string name="settings_title">Settings</string>
     <string name="settings_signature">Signature</string>
     <string name="settings_signature_desc">Attach a signature to each event you create and for others to see. Useful if multiple people add events.</string>
@@ -132,7 +134,8 @@
     <string name="row_luna_event_time">Time</string>
 
     <string name="dialog_event_detail_title">Event detail</string>
-    <string name="dialog_event_detail_close_button">OK</string>
+    <string name="dialog_event_detail_close_button">Close</string>
+    <string name="dialog_event_detail_save_button">Save</string>
     <string name="dialog_event_detail_delete_button">Delete</string>
     <string name="dialog_event_detail_quantity">Quantity</string>
     <string name="dialog_event_detail_notes">Notes</string>

gradle/libs.versions.toml

@@ -1,5 +1,5 @@
 [versions]
-agp = "8.13.0"
+agp = "8.12.0"
 kotlin = "2.0.0"
 coreKtx = "1.10.1"
 junit = "4.13.2"
@@ -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"
 
@@ -30,6 +32,8 @@ 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" }
 
 [plugins]
 android-application = { id = "com.android.application", version.ref = "agp" }

settings.gradle.kts

@@ -16,7 +16,7 @@ dependencyResolutionManagement {
     repositories {
         google()
         mavenCentral()
-        maven(url = "https://jitpack.io")
+        maven(url = uri("https://jitpack.io"))
     }
 }