Create module dateformatter

libraries/dateformatter/src/main/AndroidManifest.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (c) 2023 New Vector Ltd
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~     http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+<manifest />

libraries/dateformatter/src/main/kotlin/io/element/android/libraries/dateformatter/LastMessageFormatter.kt

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+/*
+ * Copyright (c) 2023 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.element.android.libraries.dateformatter
+
+interface LastMessageFormatter {
+    fun format(timestamp: Long?): String
+}

libraries/dateformatter/src/main/kotlin/io/element/android/libraries/dateformatter/impl/DefaultLastMessageFormatter.kt

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+/*
+ * Copyright (c) 2023 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.element.android.libraries.dateformatter.impl
+
+import android.text.format.DateFormat
+import android.text.format.DateUtils
+import com.squareup.anvil.annotations.ContributesBinding
+import io.element.android.libraries.dateformatter.LastMessageFormatter
+import io.element.android.libraries.di.AppScope
+import kotlinx.datetime.Clock
+import kotlinx.datetime.Instant
+import kotlinx.datetime.LocalDateTime
+import kotlinx.datetime.TimeZone
+import kotlinx.datetime.toInstant
+import kotlinx.datetime.toJavaLocalDate
+import kotlinx.datetime.toJavaLocalDateTime
+import kotlinx.datetime.toLocalDateTime
+import java.time.Period
+import java.time.format.DateTimeFormatter
+import java.util.Locale
+import javax.inject.Inject
+import kotlin.math.absoluteValue
+
+@ContributesBinding(AppScope::class)
+class DefaultLastMessageFormatter @Inject constructor() : LastMessageFormatter {
+
+    // TODO Inject in constructor
+    private val clock: Clock = Clock.System
+    // TODO Inject in constructor
+    private val locale: Locale = Locale.getDefault()
+
+    private val onlyTimeFormatter: DateTimeFormatter by lazy {
+        val pattern = DateFormat.getBestDateTimePattern(locale, "HH:mm")
+        DateTimeFormatter.ofPattern(pattern)
+    }
+
+    private val dateWithMonthFormatter: DateTimeFormatter by lazy {
+        val pattern = DateFormat.getBestDateTimePattern(locale, "d MMM")
+        DateTimeFormatter.ofPattern(pattern)
+    }
+
+    private val dateWithYearFormatter: DateTimeFormatter by lazy {
+        val pattern = DateFormat.getBestDateTimePattern(locale, "dd.MM.yyyy")
+        DateTimeFormatter.ofPattern(pattern)
+    }
+
+    override fun format(timestamp: Long?): String {
+        if (timestamp == null) return ""
+        val now: Instant = clock.now()
+        val tsInstant = Instant.fromEpochMilliseconds(timestamp)
+        val nowDateTime = now.toLocalDateTime(TimeZone.currentSystemDefault())
+        val tsDateTime = tsInstant.toLocalDateTime(TimeZone.currentSystemDefault())
+        val isSameDay = nowDateTime.date == tsDateTime.date
+        return when {
+            isSameDay -> {
+                onlyTimeFormatter.format(tsDateTime.toJavaLocalDateTime())
+            }
+            else -> {
+                formatDate(tsDateTime, nowDateTime)
+            }
+        }
+    }
+
+    private fun formatDate(
+        date: LocalDateTime,
+        currentDate: LocalDateTime,
+    ): String {
+        val period = Period.between(date.date.toJavaLocalDate(), currentDate.date.toJavaLocalDate())
+        return if (period.years.absoluteValue >= 1) {
+            formatDateWithYear(date)
+        } else if (period.days.absoluteValue < 2 && period.months.absoluteValue < 1) {
+            getRelativeDay(date.toInstant(TimeZone.currentSystemDefault()).toEpochMilliseconds())
+        } else {
+            formatDateWithMonth(date)
+        }
+    }
+
+    private fun formatDateWithMonth(localDateTime: LocalDateTime): String {
+        return dateWithMonthFormatter.format(localDateTime.toJavaLocalDateTime())
+    }
+
+    private fun formatDateWithYear(localDateTime: LocalDateTime): String {
+        return dateWithYearFormatter.format(localDateTime.toJavaLocalDateTime())
+    }
+
+    private fun getRelativeDay(ts: Long): String {
+        return DateUtils.getRelativeTimeSpanString(
+            ts,
+            clock.now().toEpochMilliseconds(),
+            DateUtils.DAY_IN_MILLIS,
+            DateUtils.FORMAT_SHOW_WEEKDAY
+        ).toString()
+    }
+}