Working

API/Controllers/TimeTrackController.cs

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+using Microsoft.AspNetCore.Mvc;
+using SQLiteEF;
+using static Microsoft.AspNetCore.Http.StatusCodes;
+
+namespace API.Controllers;
+
+[ApiController]
+[Route("[controller]")]
+public class TimeTrackController(Context databaseContext) : ApiController(typeof(TimeTrackController))
+{
+    [HttpGet("{steamId}/{appId}")]
+    [ProducesResponseType<TrackedTime[]>(Status200OK)]
+    [ProducesResponseType(Status404NotFound)]
+    public IActionResult GetTrackedTimeForApp(ulong steamId, ulong appId)
+    {
+        if (databaseContext.Players.Find(steamId) is not { } player)
+            return NotFound();
+        if (databaseContext.Games.Find(appId) is not { } game)
+            return NotFound();
+        databaseContext.Entry(player).Collection(p => p.TrackedTimes).Load();
+        return Ok(player.TrackedTimes.Where(t => t.Game == game).ToArray());
+    }
+    
+    [HttpGet("{steamId}/Total")]
+    [ProducesResponseType<ulong>(Status200OK)]
+    [ProducesResponseType(Status404NotFound)]
+    public IActionResult GetTrackedTimeTotal(ulong steamId)
+    {
+        if (databaseContext.Players.Find(steamId) is not { } player)
+            return NotFound();
+        databaseContext.Entry(player).Collection(p => p.TrackedTimes).Load();
+        ulong[] times = player.TrackedTimes.GroupBy(t => t.Game)
+            .Select(t => t.MaxBy(time => time.TimePlayed)?.TimePlayed ?? 0)
+            .ToArray();
+        ulong sum = 0;
+        foreach (ulong time in times)
+            sum += time;
+        return Ok(sum);
+    }
+    
+    [HttpGet("{steamId}/PerGame")]
+    [ProducesResponseType<Dictionary<ulong, ulong>>(Status200OK)]
+    [ProducesResponseType(Status404NotFound)]
+    public IActionResult GetTrackedTimeAll(ulong steamId)
+    {
+        if (databaseContext.Players.Find(steamId) is not { } player)
+            return NotFound();
+        databaseContext.Entry(player).Collection(p => p.TrackedTimes).Load();
+        Dictionary<ulong, ulong> trackedTimes = player.TrackedTimes
+            .GroupBy(t => t.Game)
+            .ToDictionary(t => t.Key.AppId, t => t.MaxBy(time => time.TimePlayed)?.TimePlayed??0);
+        
+        return Ok(trackedTimes);
+    }
+}