import { afterEach, describe, expect, it, vi } from 'vitest';
import { mock } from 'vitest-mock-extended';

import type { ActionsExecutionRequest } from '../../src/card-controller/actions/types.js';
import { AutomationsManager } from '../../src/card-controller/automations-manager.js';
import type { EventWatcherSubscriptionInterface } from '../../src/card-controller/hass/event-watcher.js';
import { ConditionStateManager } from '../../src/condition-trigger/conditions/state-manager.js';
import type { Trigger } from '../../src/config/schema/condition-trigger/triggers/types.js';
import {
  createCardAPI,
  createHASS,
  createHASSEvent,
  flushPromises,
} from '../test-utils.js';

describe('AutomationsManager', () => {
  const actions = [
    {
      action: 'fire-dom-event' as const,
      advanced_camera_card_action: 'clips',
    },
  ];
  const triggers = [{ trigger: 'fullscreen' as const, fullscreen: true }];
  const automation = {
    triggers: triggers,
    actions: actions,
  };

  afterEach(() => {
    vi.clearAllMocks();
  });

  describe('should not execute actions', () => {
    it('should do nothing without hass', () => {
      const api = createCardAPI();
      const stateManager = new ConditionStateManager();
      vi.mocked(api.getConditionStateManager).mockReturnValue(stateManager);

      const automationsManager = new AutomationsManager(api);
      automationsManager.addAutomations([automation]);

      stateManager.setState({ fullscreen: true });

      expect(api.getActionsManager().executeActions).not.toHaveBeenCalled();
    });

    it('should do nothing without being initialized', () => {
      const api = createCardAPI();
      vi.mocked(api.getHASSManager().hasHASS).mockReturnValue(true);
      vi.mocked(
        api.getInitializationManager().areMandatoryAspectsInitialized,
      ).mockReturnValue(false);
      const stateManager = new ConditionStateManager();
      vi.mocked(api.getConditionStateManager).mockReturnValue(stateManager);

      const automationsManager = new AutomationsManager(api);
      automationsManager.addAutomations([automation]);

      stateManager.setState({ fullscreen: true });

      expect(api.getActionsManager().executeActions).not.toHaveBeenCalled();
    });

    it('should do nothing when an issue is present', () => {
      const api = createCardAPI();
      vi.mocked(api.getHASSManager().hasHASS).mockReturnValue(true);
      vi.mocked(
        api.getInitializationManager().areMandatoryAspectsInitialized,
      ).mockReturnValue(true);
      vi.mocked(
        api.getIssueManager().getStateManager().hasFullCardIssue,
      ).mockReturnValue(true);

      const stateManager = new ConditionStateManager();
      vi.mocked(api.getConditionStateManager).mockReturnValue(stateManager);

      const automationsManager = new AutomationsManager(api);
      automationsManager.addAutomations([automation]);

      stateManager.setState({ fullscreen: true });

      expect(api.getActionsManager().executeActions).not.toHaveBeenCalled();
    });
  });

  it('should execute actions when triggered', () => {
    const api = createCardAPI();
    vi.mocked(api.getHASSManager().hasHASS).mockReturnValue(true);
    vi.mocked(
      api.getInitializationManager().areMandatoryAspectsInitialized,
    ).mockReturnValue(true);
    const stateManager = new ConditionStateManager();
    vi.mocked(api.getConditionStateManager).mockReturnValue(stateManager);

    const automationsManager = new AutomationsManager(api);
    automationsManager.addAutomations([automation]);

    stateManager.setState({ fullscreen: true });

    expect(api.getActionsManager().executeActions).toHaveBeenCalledTimes(1);

    // It does not re-trigger while its source stays in the same state.
    stateManager.setState({ fullscreen: true });
    expect(api.getActionsManager().executeActions).toHaveBeenCalledTimes(1);

    stateManager.setState({ fullscreen: false });
    expect(api.getActionsManager().executeActions).toHaveBeenCalledTimes(1);

    stateManager.setState({ fullscreen: true });
    expect(api.getActionsManager().executeActions).toHaveBeenCalledTimes(2);
  });

  it('should subscribe automations registered before initialization', () => {
    const api = createCardAPI();
    vi.mocked(api.getHASSManager().hasHASS).mockReturnValue(true);
    const isInitialized = vi.mocked(
      api.getInitializationManager().areMandatoryAspectsInitialized,
    );
    isInitialized.mockReturnValue(false);
    const stateManager = new ConditionStateManager();
    vi.mocked(api.getConditionStateManager).mockReturnValue(stateManager);

    const automationsManager = new AutomationsManager(api);
    automationsManager.addAutomations([automation]);

    // Registered before initialization: the triggers are not yet subscribed, so
    // a matching change does nothing.
    stateManager.setState({ fullscreen: true });
    expect(api.getActionsManager().executeActions).not.toHaveBeenCalled();

    // Initialization completes and subscribes the dormant automations.
    isInitialized.mockReturnValue(true);
    automationsManager.subscribe();

    stateManager.setState({ fullscreen: false });
    stateManager.setState({ fullscreen: true });
    expect(api.getActionsManager().executeActions).toHaveBeenCalledTimes(1);
  });

  it('should run actions when the ongoing conditions hold', () => {
    const api = createCardAPI();
    vi.mocked(api.getHASSManager().hasHASS).mockReturnValue(true);
    vi.mocked(
      api.getInitializationManager().areMandatoryAspectsInitialized,
    ).mockReturnValue(true);
    const stateManager = new ConditionStateManager();
    vi.mocked(api.getConditionStateManager).mockReturnValue(stateManager);

    const automationsManager = new AutomationsManager(api);
    automationsManager.addAutomations([
      {
        triggers: triggers,
        conditions: [{ condition: 'expand' as const, expand: true }],
        actions: actions,
      },
    ]);

    // The ongoing condition holds when triggered, so `actions` run.
    stateManager.setState({ expand: true });
    stateManager.setState({ fullscreen: true });

    expect(api.getActionsManager().executeActions).toHaveBeenCalledWith({
      actions: actions,
      triggerData: { platform: 'acc', type: 'fullscreen' },
    });
  });

  it('should do nothing when the ongoing conditions do not hold', () => {
    const api = createCardAPI();
    vi.mocked(api.getHASSManager().hasHASS).mockReturnValue(true);
    vi.mocked(
      api.getInitializationManager().areMandatoryAspectsInitialized,
    ).mockReturnValue(true);
    const stateManager = new ConditionStateManager();
    vi.mocked(api.getConditionStateManager).mockReturnValue(stateManager);

    const automationsManager = new AutomationsManager(api);
    automationsManager.addAutomations([
      {
        triggers: triggers,
        conditions: [{ condition: 'expand' as const, expand: true }],
        actions: actions,
      },
    ]);

    // The automation is triggered but the ongoing condition does not hold, so
    // nothing runs.
    stateManager.setState({ fullscreen: true });

    expect(api.getActionsManager().executeActions).not.toHaveBeenCalled();
  });

  it('should do nothing when the actions are empty', () => {
    const api = createCardAPI();
    vi.mocked(api.getHASSManager().hasHASS).mockReturnValue(true);
    vi.mocked(
      api.getInitializationManager().areMandatoryAspectsInitialized,
    ).mockReturnValue(true);
    const stateManager = new ConditionStateManager();
    vi.mocked(api.getConditionStateManager).mockReturnValue(stateManager);

    const automationsManager = new AutomationsManager(api);
    automationsManager.addAutomations([
      {
        triggers: triggers,
        actions: [],
      },
    ]);

    stateManager.setState({ fullscreen: true });

    expect(api.getActionsManager().executeActions).not.toHaveBeenCalled();
  });

  it('should prevent automation loops', () => {
    const api = createCardAPI();
    vi.mocked(api.getHASSManager().hasHASS).mockReturnValue(true);
    vi.mocked(
      api.getInitializationManager().areMandatoryAspectsInitialized,
    ).mockReturnValue(true);
    const stateManager = new ConditionStateManager();
    vi.mocked(api.getConditionStateManager).mockReturnValue(stateManager);

    const automationsManager = new AutomationsManager(api);
    automationsManager.addAutomations([
      {
        triggers: [{ trigger: 'camera' as const }],
        actions: actions,
      },
    ]);

    // Create a setup where the automation's action re-triggers itself: the camera
    // trigger responds to every camera change, and the action changes the camera,
    // looping until the nested-execution guard trips.
    let camera = 'one';

    vi.mocked(api.getActionsManager().executeActions).mockImplementation(
      async (
        // eslint-disable-next-line @typescript-eslint/no-unused-vars
        _request: ActionsExecutionRequest,
      ): Promise<void> => {
        camera = camera === 'one' ? 'two' : 'one';
        stateManager.setState({ camera: camera });
      },
    );

    stateManager.setState({ camera: camera });

    expect(api.getNotificationManager().setNotification).toHaveBeenCalledWith({
      heading: {
        text: 'Too many nested automation calls, please check your configuration for loops',
        icon: 'mdi:alert',
        severity: 'high',
      },
    });

    expect(api.getActionsManager().executeActions).toHaveBeenCalledTimes(10);
  });

  it('should reset the nested-execution counter after an overflow', async () => {
    const api = createCardAPI();
    vi.mocked(api.getHASSManager().hasHASS).mockReturnValue(true);
    vi.mocked(
      api.getInitializationManager().areMandatoryAspectsInitialized,
    ).mockReturnValue(true);
    const stateManager = new ConditionStateManager();
    vi.mocked(api.getConditionStateManager).mockReturnValue(stateManager);

    const automationsManager = new AutomationsManager(api);
    automationsManager.addAutomations([
      {
        triggers: [{ trigger: 'camera' as const }],
        actions: actions,
      },
    ]);

    // As in the loop test: the action changes the camera, re-triggering itself
    // until the nested-execution guard trips.
    let camera = 'one';
    vi.mocked(api.getActionsManager().executeActions).mockImplementation(
      async (): Promise<void> => {
        camera = camera === 'one' ? 'two' : 'one';
        stateManager.setState({ camera: camera });
      },
    );

    stateManager.setState({ camera: camera });
    expect(api.getActionsManager().executeActions).toHaveBeenCalledTimes(10);

    // The counter is decremented on the microtasks that resume after each
    // awaited execution, so let them drain before the next batch.
    await flushPromises();

    vi.mocked(api.getActionsManager().executeActions).mockClear();

    // A second, independent change overflows afresh and reaches the full limit
    // again -- only possible if the counter returned to zero. A leaked counter
    // (overflow returning without decrementing) would cut this batch short.
    stateManager.setState({ camera: 'three' });
    expect(api.getActionsManager().executeActions).toHaveBeenCalledTimes(10);
  });

  it('should execute actions on a matching HA bus event trigger', () => {
    const api = createCardAPI();
    const eventWatcher = mock<EventWatcherSubscriptionInterface>();
    vi.mocked(eventWatcher.subscribe).mockResolvedValue();
    vi.mocked(eventWatcher.unsubscribe).mockResolvedValue();
    vi.mocked(api.getHASSManager().hasHASS).mockReturnValue(true);
    vi.mocked(api.getHASSManager().getHASS).mockReturnValue(createHASS());
    vi.mocked(api.getHASSManager().getEventWatcher).mockReturnValue(eventWatcher);
    vi.mocked(
      api.getInitializationManager().areMandatoryAspectsInitialized,
    ).mockReturnValue(true);
    const stateManager = new ConditionStateManager();
    vi.mocked(api.getConditionStateManager).mockReturnValue(stateManager);

    const automationsManager = new AutomationsManager(api);
    automationsManager.addAutomations([
      {
        triggers: [{ trigger: 'event' as const, event_type: 'zha_event' }],
        actions: actions,
      },
    ]);

    expect(eventWatcher.subscribe).toHaveBeenCalledTimes(1);

    // Simulate an event arrival.
    const event = createHASSEvent('zha_event', { command: 'press' });
    vi.mocked(eventWatcher.subscribe).mock.calls[0][0].callback(event);

    expect(api.getActionsManager().executeActions).toHaveBeenCalledTimes(1);
    expect(
      vi.mocked(api.getActionsManager().executeActions).mock.calls[0][0].triggerData,
    ).toEqual({ platform: 'event', event });
  });

  it('should delete automations', () => {
    const api = createCardAPI();
    vi.mocked(api.getHASSManager().hasHASS).mockReturnValue(true);
    vi.mocked(
      api.getInitializationManager().areMandatoryAspectsInitialized,
    ).mockReturnValue(true);
    const stateManager = new ConditionStateManager();
    vi.mocked(api.getConditionStateManager).mockReturnValue(stateManager);

    const automationsManager = new AutomationsManager(api);
    automationsManager.addAutomations([
      {
        triggers: [{ trigger: 'expand' as const, expand: true }],
        actions: actions,
      },
      {
        triggers: [{ trigger: 'fullscreen' as const, fullscreen: true }],
        actions: actions,
        tag: 'fullscreen',
      },
    ]);

    stateManager.setState({ fullscreen: true });
    expect(api.getActionsManager().executeActions).toHaveBeenCalledTimes(1);

    // Delete the fullscreen automation.
    automationsManager.deleteAutomations('fullscreen');

    stateManager.setState({ fullscreen: false });
    stateManager.setState({ fullscreen: true });
    expect(api.getActionsManager().executeActions).toHaveBeenCalledTimes(1);

    stateManager.setState({ expand: true });
    expect(api.getActionsManager().executeActions).toHaveBeenCalledTimes(2);

    // Delete all automations.
    automationsManager.deleteAutomations();

    stateManager.setState({ expand: false });
    stateManager.setState({ expand: true });
    expect(api.getActionsManager().executeActions).toHaveBeenCalledTimes(2);
  });

  describe('should report the triggers it subscribes to', () => {
    it('with no automations', () => {
      expect(new AutomationsManager(createCardAPI()).getTriggers()).toEqual([]);
    });

    it('with automations', () => {
      const keyTrigger: Trigger = { trigger: 'key', key: 'ArrowLeft' };
      const expandTrigger: Trigger = { trigger: 'expand', expand: true };

      const automationsManager = new AutomationsManager(createCardAPI());
      automationsManager.addAutomations([
        { triggers: [keyTrigger, expandTrigger], actions },
        { triggers: triggers, actions },
      ]);

      expect(automationsManager.getTriggers()).toEqual([
        keyTrigger,
        expandTrigger,
        ...triggers,
      ]);
    });
  });
});