add previous/next event link to details dialog

The links will point to the previous/next
event of the same type

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

@@ -39,6 +39,7 @@ import it.danieleverducci.lunatracker.repository.WebDAVLogbookRepository
 import kotlinx.coroutines.Runnable
 import okio.IOException
 import org.json.JSONException
+import utils.DateUtils
 import utils.NumericUtils
 import java.text.DateFormat
 import java.util.Calendar
@@ -131,7 +132,7 @@ class MainActivity : AppCompatActivity() {
         val adapter = LunaEventRecyclerAdapter(this, items)
         adapter.onItemClickListener = object: LunaEventRecyclerAdapter.OnItemClickListener{
             override fun onItemClick(event: LunaEvent) {
-                showEventDetailDialog(event)
+                showEventDetailDialog(event, items)
             }
         }
         recyclerView.adapter = adapter
@@ -308,7 +309,35 @@ class MainActivity : AppCompatActivity() {
         alertDialog.show()
     }
 
-    fun showEventDetailDialog(event: LunaEvent) {
+    fun getPreviousSameEvent(event: LunaEvent, items: ArrayList<LunaEvent>): LunaEvent? {
+        var previousEvent: LunaEvent? = null
+        for (item in items) {
+            if (item.type == event.type && item.time < event.time) {
+                if (previousEvent == null) {
+                    previousEvent = item
+                } else if (previousEvent.time < item.time) {
+                    previousEvent = item
+                }
+            }
+        }
+        return previousEvent
+    }
+
+    fun getNextSameEvent(event: LunaEvent, items: ArrayList<LunaEvent>): LunaEvent? {
+        var nextEvent: LunaEvent? = null
+        for (item in items) {
+            if (item.type == event.type && item.time > event.time) {
+                if (nextEvent == null) {
+                    nextEvent = item
+                } else if (nextEvent.time > item.time) {
+                    nextEvent = item
+                }
+            }
+        }
+        return nextEvent
+    }
+
+    fun showEventDetailDialog(event: LunaEvent, items: ArrayList<LunaEvent>) {
         // Do not update list while the detail is shown, to avoid changing the object below while it is changed by the user
         pauseLogbookUpdate = true
         val dateFormat = DateFormat.getDateTimeInstance()
@@ -359,6 +388,37 @@ class MainActivity : AppCompatActivity() {
             // Resume logbook update
             pauseLogbookUpdate = false
         })
+
+        // create next/previous links to events of the same type
+
+        val previousTextView = dialogView.findViewById<TextView>(R.id.dialog_event_previous)
+        val nextTextView = dialogView.findViewById<TextView>(R.id.dialog_event_next)
+        val nextEvent = getNextSameEvent(event, items)
+        val previousEvent = getPreviousSameEvent(event, items)
+
+        if (previousEvent != null) {
+            val emoji = previousEvent.getTypeEmoji(applicationContext)
+            val time = DateUtils.formatTimeDuration(applicationContext, event.time - previousEvent.time)
+            previousTextView.text = String.format("⬅️ %s %s", emoji, time)
+            previousTextView.setOnClickListener {
+                alertDialog.cancel()
+                showEventDetailDialog(previousEvent, items)
+            }
+        } else {
+            previousTextView.visibility = View.GONE
+        }
+
+        if (nextEvent != null) {
+            val emoji = nextEvent.getTypeEmoji(applicationContext)
+            val time = DateUtils.formatTimeDuration(applicationContext, nextEvent.time - event.time)
+            nextTextView.text = String.format("%s %s ➡️", time, emoji)
+            nextTextView.setOnClickListener {
+                alertDialog.cancel()
+                showEventDetailDialog(nextEvent, items)
+            }
+        } else {
+            nextTextView.visibility = View.GONE
+        }
     }
 
     fun showAddLogbookDialog(requestedByUser: Boolean) {

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

@@ -7,6 +7,62 @@ import java.util.Date
 
 class DateUtils {
     companion object {
+        fun formatTimeDuration(context: Context, secondsDiff: Long): String {
+            var seconds = secondsDiff
+
+            val years = (seconds / (365 * 24 * 60 * 60F)).toLong()
+            seconds -= years * (365 * 24 * 60 * 60)
+            val days = (seconds / (24 * 60 * 60F)).toLong()
+            seconds -= days * (24 * 60 * 60)
+            val hours = (seconds / (60 * 60F)).toLong()
+            seconds -= hours * (60 * 60)
+            val minutes = (seconds / 60F).toLong()
+            seconds -= minutes * 60
+
+            fun format(value1: Long, value2: Long, resIdSingular1: Int, resIdPlural1: Int, resIdSingular2: Int, resIdPlural2: Int): String {
+                val builder = StringBuilder()
+                if (value1 == 0L) {
+                    // omit
+                } else if (value1 == 1L) {
+                    builder.append(value1)
+                    builder.append(" ")
+                    builder.append(context.getString(resIdSingular1))
+                } else {
+                    builder.append(value1)
+                    builder.append(" ")
+                    builder.append(context.getString(resIdPlural1))
+                }
+
+                if (value1 > 0L && value2 > 0L) {
+                    builder.append(", ")
+                }
+
+                if (value2 == 0L) {
+                    // omit
+                } else if (value2 == 1L) {
+                    builder.append(value2)
+                    builder.append(" ")
+                    builder.append(context.getString(resIdSingular2))
+                } else {
+                    builder.append(value2)
+                    builder.append(" ")
+                    builder.append(context.getString(resIdPlural2))
+                }
+                return builder.toString()
+            }
+
+            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 > 0) {
+                return format(days, hours, R.string.day_ago, R.string.days_ago, R.string.hour_ago, R.string.hours_ago)
+            } 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 if (minutes > 0) {
+                return format(minutes, seconds, R.string.minute_ago, R.string.minute_ago, R.string.second_ago, R.string.seconds_ago)
+            } else {
+                return context.getString(R.string.now)
+            }
+        }
 
         /**
          * Formats the provided unix timestamp in a string like "3 hours, 26 minutes ago)

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

@@ -60,4 +60,33 @@
             android:text="@string/dialog_event_detail_notes"/>
 
     </ScrollView>
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="horizontal">
+
+        <TextView
+            android:id="@+id/dialog_event_previous"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="10dp"
+            android:textSize="12sp"
+            android:text="" />
+
+        <Space
+            android:layout_width="0dp"
+            android:layout_weight="1"
+            android:layout_height="match_parent" />
+
+        <TextView
+            android:id="@+id/dialog_event_next"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginEnd="10dp"
+            android:textSize="12sp"
+            android:text="" />
+
+    </LinearLayout>
+
 </LinearLayout>

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

@@ -55,10 +55,16 @@
     <string name="toast_integer_error">Invalid value. Insert an integer.</string>
 
     <string name="now">now</string>
-    <string name="hour_ago">hour</string>
+    <string name="second_ago">sec</string>
-    <string name="hours_ago">hours</string>
+    <string name="seconds_ago">secs</string>
     <string name="minute_ago">min</string>
     <string name="minutes_ago">mins</string>
+    <string name="hour_ago">hour</string>
+    <string name="hours_ago">hours</string>
+    <string name="day_ago">year</string>
+    <string name="days_ago">years</string>
+    <string name="year_ago">year</string>
+    <string name="years_ago">years</string>
 
     <string name="no_connection">No connection</string>
     <string name="no_connection_explain">Unable to reach WebDAV service</string>