Adds team and hunter leaderboard endpoints

src/main/kotlin/net/halfbinary/scavengerhuntapi/service/StatsService.kt

@@ -0,0 +1,58 @@
+package net.halfbinary.scavengerhuntapi.service
+
+import net.halfbinary.scavengerhuntapi.model.HuntId
+import net.halfbinary.scavengerhuntapi.model.PhotoStatus
+import net.halfbinary.scavengerhuntapi.model.domain.HunterLeaderboardEntry
+import net.halfbinary.scavengerhuntapi.model.domain.TeamLeaderboardEntry
+import net.halfbinary.scavengerhuntapi.repository.ItemRepository
+import net.halfbinary.scavengerhuntapi.repository.PhotoRepository
+import org.springframework.stereotype.Service
+
+@Service
+class StatsService(
+    private val photoRepository: PhotoRepository,
+    private val itemRepository: ItemRepository,
+    private val teamService: TeamService,
+    private val hunterService: HunterService
+) {
+    fun getTeamLeaderboard(huntId: HuntId): List<TeamLeaderboardEntry> {
+        val approvedPhotos = photoRepository.findByHuntIdAndStatus(huntId, PhotoStatus.APPROVED)
+        val itemPoints = itemRepository.findAllByHuntId(huntId).associate { it.id to it.points }
+        val teams = teamService.getListOfTeamsForHunt(huntId)
+
+        val sortedScores = teams.map { team ->
+            val teamHunterIds = teamService.getHunterIdsForTeam(team.id)
+            val score = approvedPhotos
+                .filter { it.hunterId in teamHunterIds }
+                .distinctBy { it.itemId }
+                .sumOf { itemPoints[it.itemId] ?: 0 }
+            team to score
+        }.sortedByDescending { (_, score) -> score }
+
+        var rank = 1
+        return sortedScores.mapIndexed { index, (team, score) ->
+            if (index > 0 && sortedScores[index - 1].second != score) rank = index + 1
+            TeamLeaderboardEntry(rank = rank, teamName = team.name, score = score)
+        }
+    }
+
+    fun getHunterLeaderboard(huntId: HuntId): List<HunterLeaderboardEntry> {
+        val approvedPhotos = photoRepository.findByHuntIdAndStatus(huntId, PhotoStatus.APPROVED)
+        val itemPoints = itemRepository.findAllByHuntId(huntId).associate { it.id to it.points }
+
+        val sortedScores = approvedPhotos
+            .groupBy { it.hunterId }
+            .map { (hunterId, photos) ->
+                val score = photos.distinctBy { it.itemId }.sumOf { itemPoints[it.itemId] ?: 0 }
+                hunterId to score
+            }
+            .sortedByDescending { (_, score) -> score }
+
+        var rank = 1
+        return sortedScores.mapIndexed { index, (hunterId, score) ->
+            if (index > 0 && sortedScores[index - 1].second != score) rank = index + 1
+            val hunter = hunterService.getHunterById(hunterId)
+            HunterLeaderboardEntry(rank = rank, hunterName = hunter.name, score = score)
+        }
+    }
+}