Puzzles

SVSim.EmulatedEntrypoint/Services/PuzzleMissionEvaluator.cs

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+using SVSim.Database.Models;
+
+namespace SVSim.EmulatedEntrypoint.Services;
+
+/// <summary>
+/// Pure service — maps the puzzle mission catalog against a viewer's cleared-puzzle set and
+/// produces per-mission (total_count, is_achieved) statuses. Used by both /basic_puzzle/mission
+/// (snapshot) and /basic_puzzle/finish (post-clear delta detection).
+/// </summary>
+public sealed class PuzzleMissionEvaluator
+{
+    public sealed record MissionStatus(PuzzleMissionEntry Mission, int TotalCount, bool IsAchieved);
+
+    public IReadOnlyList<MissionStatus> Evaluate(
+        IEnumerable<PuzzleMissionEntry> catalog,
+        IReadOnlyDictionary<int, HashSet<int>> clearedByGroup)
+    {
+        var result = new List<MissionStatus>();
+        foreach (var mission in catalog)
+        {
+            int count = ComputeTotalCount(mission, clearedByGroup);
+            result.Add(new MissionStatus(mission, count, count >= mission.RequireNumber));
+        }
+        return result;
+    }
+
+    /// <summary>Returns ONLY the missions whose status flipped from not-achieved to achieved
+    /// between before and after. Other missions (already-achieved, still-incomplete) are omitted.</summary>
+    public IReadOnlyList<MissionStatus> FreshlyCompleted(
+        IEnumerable<PuzzleMissionEntry> catalog,
+        IReadOnlyDictionary<int, HashSet<int>> clearedByGroupBefore,
+        IReadOnlyDictionary<int, HashSet<int>> clearedByGroupAfter)
+    {
+        var result = new List<MissionStatus>();
+        foreach (var mission in catalog)
+        {
+            int before = ComputeTotalCount(mission, clearedByGroupBefore);
+            int after  = ComputeTotalCount(mission, clearedByGroupAfter);
+            bool wasAchieved = before >= mission.RequireNumber;
+            bool isAchieved  = after  >= mission.RequireNumber;
+            if (!wasAchieved && isAchieved)
+                result.Add(new MissionStatus(mission, after, true));
+        }
+        return result;
+    }
+
+    private static int ComputeTotalCount(PuzzleMissionEntry mission, IReadOnlyDictionary<int, HashSet<int>> clearedByGroup)
+    {
+        if (mission.TargetPuzzleGroupId is not int groupId) return 0;
+        if (!clearedByGroup.TryGetValue(groupId, out var cleared)) return 0;
+        return Math.Min(cleared.Count, mission.RequireNumber);
+    }
+}