Add initial support for automations.

src/automations.ts

@@ -0,0 +1,50 @@
+import { HomeAssistant } from 'custom-card-helpers';
+import { AutomationActions, FrigateCardError } from './types.js';
+import { ConditionController } from './conditions.js';
+import { Automation, Automations } from './types.js';
+import { frigateCardHandleAction } from './utils/action.js';
+import { localize } from './localize/localize.js';
+
+const MAX_NESTED_AUTOMATION_EXECUTIONS = 10;
+
+export class AutomationsControllerError extends FrigateCardError {}
+
+export class AutomationsController {
+  protected _automations: Automations;
+  protected _priorEvaluations: Map<Automation, boolean> = new Map();
+
+  // A counter to avoid infinite loops, increases every time actions are run,
+  // decreases every time actions are complete.
+  protected _nestedAutomationExecutions = 0;
+
+  constructor(automations: Automations) {
+    this._automations = automations;
+  }
+
+  public execute(
+    element: HTMLElement,
+    hass: HomeAssistant,
+    conditionController: ConditionController,
+  ): void {
+    const actionsToRun: AutomationActions[] = [];
+    for (const automation of this._automations ?? []) {
+      const shouldExecute = conditionController.evaluateCondition(automation.conditions);
+      const actions = shouldExecute ? automation.actions : automation.actions_not;
+      const priorEvaluation = this._priorEvaluations.get(automation);
+      this._priorEvaluations.set(automation, shouldExecute);
+      if (shouldExecute !== priorEvaluation && actions) {
+        actionsToRun.push(actions);
+      }
+    }
+
+    ++this._nestedAutomationExecutions;
+    if (this._nestedAutomationExecutions > MAX_NESTED_AUTOMATION_EXECUTIONS) {
+      throw new AutomationsControllerError(localize('error.too_many_automations'));
+    }
+
+    actionsToRun.forEach((actions) => {
+      frigateCardHandleAction(element, hass, {}, actions);
+    });
+    --this._nestedAutomationExecutions;
+  }
+}