AppServices.register('todos', {
  _nudgeTimers: [],

  initialize() {
    AppServices.registerTask('todos', 'update-badge', {
      intervalMs: 5 * 60 * 1000,
      run: async ({ apiJson }) => {
        const data = await apiJson('/app/todos/api/badge-count');
        if (!data || !Number.isFinite(data.count)) {
          return undefined;
        }
        return data.count;
      },
      onSuccess: (count) => {
        if (count === undefined) {
          return;
        }
        this.updateBadge(count);
      }
    });

    AppServices.registerTask('todos', 'check-nudges', {
      run: async ({ apiJson }) => {
        const data = await apiJson('/app/todos/api/nudges');
        if (!data || !Array.isArray(data.nudges)) {
          return undefined;
        }
        this.checkNudges(data.nudges);
        return data.nudges.length;
      }
    });
  },

  updateBadge(count) {
    if (count > 0) {
      AppServices.badges.app.set('todos', count);
    } else {
      AppServices.badges.app.clear('todos');
    }
  },

  checkNudges(nudges) {
    // Clear existing timers
    this._nudgeTimers.forEach(t => clearTimeout(t));
    this._nudgeTimers = [];

    const now = Date.now();
    for (const nudge of nudges) {
      const nudgeTime = this._parseNudge(nudge.nudge);
      const delay = nudgeTime - now;

      if (delay > 0 && delay < 24 * 60 * 60 * 1000) {
        const timer = setTimeout(() => {
          AppServices.notifications.show({
            app: 'todos',
            icon: '✅',
            title: 'Todo Reminder',
            message: nudge.text,
            action: `/app/todos/${nudge.day}`,
            facet: nudge.facet,
            autoDismiss: 30000,
          });
        }, delay);
        this._nudgeTimers.push(timer);
      }
    }
  },

  _parseNudge(nudgeStr) {
    // YYYYMMDDTHH:MM -> timestamp
    const year = parseInt(nudgeStr.slice(0, 4));
    const month = parseInt(nudgeStr.slice(4, 6)) - 1;
    const day = parseInt(nudgeStr.slice(6, 8));
    const hour = parseInt(nudgeStr.slice(9, 11));
    const minute = parseInt(nudgeStr.slice(12, 14));
    return new Date(year, month, day, hour, minute).getTime();
  }
});