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using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using StardewModdingAPI.Framework.StateTracking.Comparers;
using StardewModdingAPI.Framework.StateTracking.FieldWatchers;
using StardewValley;
using StardewValley.Buildings;
using StardewValley.Locations;
namespace StardewModdingAPI.Framework.StateTracking
{
/// <summary>Detects changes to the game's locations.</summary>
internal class WorldLocationsTracker : IWatcher
{
/*********
** Properties
*********/
/// <summary>Tracks changes to the location list.</summary>
private readonly ICollectionWatcher<GameLocation> LocationListWatcher;
/// <summary>A lookup of the tracked locations.</summary>
private IDictionary<GameLocation, LocationTracker> LocationDict { get; } = new Dictionary<GameLocation, LocationTracker>(new ObjectReferenceComparer<GameLocation>());
/// <summary>A lookup of registered buildings and their indoor location.</summary>
private readonly IDictionary<Building, GameLocation> BuildingIndoors = new Dictionary<Building, GameLocation>(new ObjectReferenceComparer<Building>());
/*********
** Accessors
*********/
/// <summary>Whether locations were added or removed since the last reset.</summary>
public bool IsLocationListChanged => this.Added.Any() || this.Removed.Any();
/// <summary>Whether any tracked location data changed since the last reset.</summary>
public bool IsChanged => this.IsLocationListChanged || this.Locations.Any(p => p.IsChanged);
/// <summary>The tracked locations.</summary>
public IEnumerable<LocationTracker> Locations => this.LocationDict.Values;
/// <summary>The locations removed since the last update.</summary>
public ICollection<GameLocation> Added { get; } = new HashSet<GameLocation>(new ObjectReferenceComparer<GameLocation>());
/// <summary>The locations added since the last update.</summary>
public ICollection<GameLocation> Removed { get; } = new HashSet<GameLocation>(new ObjectReferenceComparer<GameLocation>());
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
/// <param name="locations">The game's list of locations.</param>
public WorldLocationsTracker(ObservableCollection<GameLocation> locations)
{
this.LocationListWatcher = WatcherFactory.ForObservableCollection(locations);
}
/// <summary>Update the current value if needed.</summary>
public void Update()
{
// detect location changes
if (this.LocationListWatcher.IsChanged)
{
this.Remove(this.LocationListWatcher.Removed);
this.Add(this.LocationListWatcher.Added);
}
// detect building changes
foreach (LocationTracker watcher in this.Locations.ToArray())
{
if (watcher.BuildingsWatcher.IsChanged)
{
this.Remove(watcher.BuildingsWatcher.Removed);
this.Add(watcher.BuildingsWatcher.Added);
}
}
// detect building interior changed (e.g. construction completed)
foreach (KeyValuePair<Building, GameLocation> pair in this.BuildingIndoors.Where(p => !object.Equals(p.Key.indoors.Value, p.Value)))
{
GameLocation oldIndoors = pair.Value;
GameLocation newIndoors = pair.Key.indoors.Value;
if (oldIndoors != null)
this.Added.Add(oldIndoors);
if (newIndoors != null)
this.Removed.Add(newIndoors);
}
// update watchers
foreach (IWatcher watcher in this.Locations)
watcher.Update();
}
/// <summary>Set the current location list as the baseline.</summary>
public void ResetLocationList()
{
this.Removed.Clear();
this.Added.Clear();
this.LocationListWatcher.Reset();
}
/// <summary>Set the current value as the baseline.</summary>
public void Reset()
{
this.ResetLocationList();
foreach (IWatcher watcher in this.Locations)
watcher.Reset();
}
/// <summary>Stop watching the player fields and release all references.</summary>
public void Dispose()
{
this.LocationListWatcher.Dispose();
foreach (IWatcher watcher in this.Locations)
watcher.Dispose();
}
/*********
** Private methods
*********/
/****
** Enumerable wrappers
****/
/// <summary>Add the given buildings.</summary>
/// <param name="buildings">The buildings to add.</param>
public void Add(IEnumerable<Building> buildings)
{
foreach (Building building in buildings)
this.Add(building);
}
/// <summary>Add the given locations.</summary>
/// <param name="locations">The locations to add.</param>
public void Add(IEnumerable<GameLocation> locations)
{
foreach (GameLocation location in locations)
this.Add(location);
}
/// <summary>Remove the given buildings.</summary>
/// <param name="buildings">The buildings to remove.</param>
public void Remove(IEnumerable<Building> buildings)
{
foreach (Building building in buildings)
this.Remove(building);
}
/// <summary>Remove the given locations.</summary>
/// <param name="locations">The locations to remove.</param>
public void Remove(IEnumerable<GameLocation> locations)
{
foreach (GameLocation location in locations)
this.Remove(location);
}
/****
** Main add/remove logic
****/
/// <summary>Add the given building.</summary>
/// <param name="building">The building to add.</param>
public void Add(Building building)
{
if (building == null)
return;
GameLocation indoors = building.indoors.Value;
this.BuildingIndoors[building] = indoors;
this.Add(indoors);
}
/// <summary>Add the given location.</summary>
/// <param name="location">The location to add.</param>
public void Add(GameLocation location)
{
if (location == null)
return;
// remove old location if needed
this.Remove(location);
// track change
this.Added.Add(location);
// add
this.LocationDict[location] = new LocationTracker(location);
if (location is BuildableGameLocation buildableLocation)
this.Add(buildableLocation.buildings);
}
/// <summary>Remove the given building.</summary>
/// <param name="building">The building to remove.</param>
public void Remove(Building building)
{
if (building == null)
return;
this.BuildingIndoors.Remove(building);
this.Remove(building.indoors.Value);
}
/// <summary>Remove the given location.</summary>
/// <param name="location">The location to remove.</param>
public void Remove(GameLocation location)
{
if (location == null)
return;
if (this.LocationDict.TryGetValue(location, out LocationTracker watcher))
{
// track change
this.Removed.Add(location);
// remove
this.LocationDict.Remove(location);
watcher.Dispose();
if (location is BuildableGameLocation buildableLocation)
this.Remove(buildableLocation.buildings);
}
}
}
}
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