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using System.Collections.Generic;
using System.Linq;
using StardewModdingAPI.Framework.StateTracking.Comparers;
using StardewValley;
namespace StardewModdingAPI.Framework.StateTracking.Snapshots
{
/// <summary>A frozen snapshot of the tracked game locations.</summary>
internal class WorldLocationsSnapshot
{
/*********
** Fields
*********/
/// <summary>A map of tracked locations.</summary>
private readonly Dictionary<GameLocation, LocationSnapshot> LocationsDict = new(new ObjectReferenceComparer<GameLocation>());
/*********
** Accessors
*********/
/// <summary>Tracks changes to the location list.</summary>
public SnapshotListDiff<GameLocation> LocationList { get; } = new();
/// <summary>The tracked locations.</summary>
public IEnumerable<LocationSnapshot> Locations => this.LocationsDict.Values;
/*********
** Public methods
*********/
/// <summary>Update the tracked values.</summary>
/// <param name="watcher">The watcher to snapshot.</param>
public void Update(WorldLocationsTracker watcher)
{
// update location list
this.LocationList.Update(watcher.IsLocationListChanged, watcher.Added, watcher.Removed);
// remove missing locations
foreach (var key in this.LocationsDict.Keys.Where(key => !watcher.HasLocationTracker(key)).ToArray())
this.LocationsDict.Remove(key);
// update locations
foreach (LocationTracker locationWatcher in watcher.Locations)
{
if (!this.LocationsDict.TryGetValue(locationWatcher.Location, out LocationSnapshot snapshot))
this.LocationsDict[locationWatcher.Location] = snapshot = new LocationSnapshot(locationWatcher.Location);
snapshot.Update(locationWatcher);
}
}
}
}
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