Initial

resources/app/client/data/collections/combats.js

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+/**
+ * The singleton collection of Combat documents which exist within the active World.
+ * This Collection is accessible within the Game object as game.combats.
+ * @extends {WorldCollection}
+ *
+ * @see {@link Combat} The Combat document
+ * @see {@link CombatTracker} The CombatTracker sidebar directory
+ */
+class CombatEncounters extends WorldCollection {
+
+  /** @override */
+  static documentName = "Combat";
+
+  /* -------------------------------------------- */
+
+  /**
+   * Provide the settings object which configures the Combat document
+   * @type {object}
+   */
+  static get settings() {
+    return game.settings.get("core", Combat.CONFIG_SETTING);
+  }
+
+  /* -------------------------------------------- */
+
+  /** @inheritdoc */
+  get directory() {
+    return ui.combat;
+  }
+
+  /* -------------------------------------------- */
+
+  /**
+   * Get an Array of Combat instances which apply to the current canvas scene
+   * @type {Combat[]}
+   */
+  get combats() {
+    return this.filter(c => (c.scene === null) || (c.scene === game.scenes.current));
+  }
+
+  /* -------------------------------------------- */
+
+  /**
+   * The currently active Combat instance
+   * @type {Combat}
+   */
+  get active() {
+    return this.combats.find(c => c.active);
+  }
+
+  /* -------------------------------------------- */
+
+  /**
+   * The currently viewed Combat encounter
+   * @type {Combat|null}
+   */
+  get viewed() {
+    return ui.combat?.viewed ?? null;
+  }
+
+  /* -------------------------------------------- */
+
+  /**
+   * When a Token is deleted, remove it as a combatant from any combat encounters which included the Token
+   * @param {string} sceneId      The Scene id within which a Token is being deleted
+   * @param {string} tokenId      The Token id being deleted
+   * @protected
+   */
+  async _onDeleteToken(sceneId, tokenId) {
+    for ( let combat of this ) {
+      const toDelete = [];
+      for ( let c of combat.combatants ) {
+        if ( (c.sceneId === sceneId) && (c.tokenId === tokenId) ) toDelete.push(c.id);
+      }
+      if ( toDelete.length ) await combat.deleteEmbeddedDocuments("Combatant", toDelete);
+    }
+  }
+}