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CLAUDE.md

@@ -18,6 +18,13 @@ The plugin **never directly references TOU Mira types**. All access is via refle
 ### Harmony Patching Strategy
 Uses `[HarmonyPriority(Priority.Low)]` on the `AmongUsClient.OnGameEnd` patch to ensure TOU Mira's `BuildEndGameData()` runs first and populates `EndGameData.PlayerRecords` before the export begins.
 
+### Game Duration Tracking
+The plugin tracks actual gameplay duration (not lobby time) using `GameStartTimePatch`:
+- Patches `ShipStatus.Begin` to capture when the game round starts
+- Stores start time as `Time.time` when gameplay begins
+- Calculates duration as difference between game end time and start time
+- Resets on each game to ensure accurate per-game timing
+
 ### Async Export Pattern
 Export runs in a fire-and-forget Task.Run() to avoid blocking the game UI. The entire export process (reflection, data transformation, API call) happens asynchronously.
 
@@ -63,20 +70,27 @@ If the `AmongUs` environment variable is set, the DLL auto-copies to `$(AmongUs)
 1. `TownOfUsStatsPlugin.Load()` - BepInEx entry point
 2. `TouMiraReflectionBridge.Initialize()` - Find TOU Mira assembly, cache reflection metadata
 3. `VersionCompatibility.CheckVersion()` - Verify TOU Mira version compatibility
-4. `Harmony.PatchAll()` - Apply patches (EndGameExportPatch)
+4. `Harmony.PatchAll()` - Apply patches (EndGameExportPatch, GameStartTimePatch)
+
+### Game Start Flow
+1. **ShipStatus.Begin** fires (game round starts, gameplay begins)
+2. **GameStartTimePatch.OnShipStatusBegin** runs - records `Time.time` as game start time
 
 ### Export Flow (Game End)
 1. **AmongUsClient.OnGameEnd** fires (game ends)
-2. **TOU Mira's patch** runs (High priority) - populates EndGameData.PlayerRecords
-3. **EndGameExportPatch.Postfix** runs (Low priority) - starts export
+2. **GameStartTimePatch.OnGameEndPrefix** runs - logs game duration
+3. **TOU Mira's patch** runs (High priority) - populates EndGameData.PlayerRecords
+4. **EndGameExportPatch.Postfix** runs (Low priority) - starts export
    - Checks for Hide & Seek mode (skip if true)
    - Fires Task.Run() with `StatsExporter.ExportGameStatsAsync()`
-4. **StatsExporter.ExportGameStatsAsync()**
+5. **StatsExporter.ExportGameStatsAsync()**
    - Reads `ApiSet.ini` config
    - Calls reflection bridge methods to collect data
    - Transforms data via `DataTransformer.TransformToExportFormat()`
+     - Uses `GameStartTimePatch.GetGameDuration()` for accurate game time
    - Saves local backup if enabled
    - POSTs to API via `ApiClient.SendToApiAsync()`
+6. **GameStartTimePatch.OnGameEndPostfix** runs - clears game start time for next game
 
 ### Key Reflection Patterns
 
@@ -164,7 +178,7 @@ GameStatsData
 │   ├── Timestamp (UTC)
 │   ├── LobbyCode (e.g., "ABCDEF")
 │   ├── GameMode (Normal/HideNSeek)
-│   ├── Duration (seconds)
+│   ├── Duration (seconds, actual gameplay time from intro end to game end)
 │   └── Map (string)
 ├── Players[] (list)
 │   ├── PlayerId (byte)
@@ -309,3 +323,4 @@ Symbols are extracted **before** text cleaning to preserve information:
 - No compile-time type safety (all reflection is string-based)
 - Breaking changes in TOU Mira require plugin updates
 - Symbol encoding may vary by console/log viewer (e.g., `♥` may display as `ÔÖą` in logs)
+- to memorize