WTA #44: Created helper class to re-calculate streak.

home/src/main/java/com/jacob/wakatimeapp/home/domain/RecalculateLatestStreakService.kt

@@ -0,0 +1,44 @@
+package com.jacob.wakatimeapp.home.domain
+
+import arrow.core.getOrElse
+import com.jacob.wakatimeapp.home.data.network.HomePageNetworkData
+import com.jacob.wakatimeapp.home.domain.models.StreakRange
+import com.jacob.wakatimeapp.home.domain.usecases.getLatestStreakInRange
+import javax.inject.Inject
+import javax.inject.Singleton
+import kotlinx.datetime.DateTimeUnit
+import kotlinx.datetime.DateTimeUnit.DateBased
+import kotlinx.datetime.LocalDate
+import kotlinx.datetime.minus
+
+@Singleton
+class RecalculateLatestStreakService @Inject constructor(
+    private val homePageNetworkData: HomePageNetworkData,
+) {
+    suspend fun calculate(
+        start: LocalDate,
+        value: Int,
+        unit: DateBased,
+    ): StreakRange {
+        val end = start.minus(value, unit)
+        return homePageNetworkData.getStatsForRange(start.toString(), end.toString())
+            .map { stats ->
+                stats.dailyStats
+                    .associate { it.date to it.timeSpent }
+                    .getLatestStreakInRange()
+            }
+            .map { StreakRange(start = it.last().key, end = it.first().key) }
+            .map {
+                if (it.days == value) {
+                    it + calculate(
+                        start = end.minus(1, DateTimeUnit.DAY),
+                        value = value,
+                        unit = unit
+                    )
+                } else {
+                    it
+                }
+            }
+            .getOrElse { StreakRange.ZERO }
+    }
+}