/**
 * Schedule presets for scheduled tasks and event automations.
 * Shared between CreateTaskModal and EditTaskModal.
 */

export interface SchedulePreset {
  id: string;
  label: string;
  description: string;
  type: 'INTERVAL' | 'CRON';
  interval_minutes?: number;
  cron_expression?: string;
}

export const SCHEDULE_PRESETS: SchedulePreset[] = [
  // Interval-based
  {
    id: 'every_15min',
    label: 'Every 15 minutes',
    description: 'Runs 4 times per hour',
    type: 'INTERVAL',
    interval_minutes: 15,
  },
  {
    id: 'every_30min',
    label: 'Every 30 minutes',
    description: 'Runs twice per hour',
    type: 'INTERVAL',
    interval_minutes: 30,
  },
  {
    id: 'every_hour',
    label: 'Every hour',
    description: 'Runs 24 times per day',
    type: 'INTERVAL',
    interval_minutes: 60,
  },
  {
    id: 'every_2hours',
    label: 'Every 2 hours',
    description: 'Runs 12 times per day',
    type: 'INTERVAL',
    interval_minutes: 120,
  },
  {
    id: 'every_4hours',
    label: 'Every 4 hours',
    description: 'Runs 6 times per day',
    type: 'INTERVAL',
    interval_minutes: 240,
  },
  {
    id: 'every_6hours',
    label: 'Every 6 hours',
    description: 'Runs 4 times per day',
    type: 'INTERVAL',
    interval_minutes: 360,
  },
  {
    id: 'every_12hours',
    label: 'Twice daily',
    description: 'Runs at midnight and noon',
    type: 'INTERVAL',
    interval_minutes: 720,
  },
  // Cron-based (specific times)
  {
    id: 'daily_midnight',
    label: 'Daily at midnight',
    description: 'Runs once per day at 12:00 AM',
    type: 'CRON',
    cron_expression: '0 0 * * *',
  },
  {
    id: 'daily_9am',
    label: 'Daily at 9 AM',
    description: 'Runs once per day at 9:00 AM',
    type: 'CRON',
    cron_expression: '0 9 * * *',
  },
  {
    id: 'daily_6pm',
    label: 'Daily at 6 PM',
    description: 'Runs once per day at 6:00 PM',
    type: 'CRON',
    cron_expression: '0 18 * * *',
  },
  {
    id: 'weekdays_9am',
    label: 'Weekdays at 9 AM',
    description: 'Mon-Fri at 9:00 AM',
    type: 'CRON',
    cron_expression: '0 9 * * 1-5',
  },
  {
    id: 'weekdays_6pm',
    label: 'Weekdays at 6 PM',
    description: 'Mon-Fri at 6:00 PM',
    type: 'CRON',
    cron_expression: '0 18 * * 1-5',
  },
  {
    id: 'weekly_sunday',
    label: 'Weekly on Sunday',
    description: 'Every Sunday at midnight',
    type: 'CRON',
    cron_expression: '0 0 * * 0',
  },
  {
    id: 'weekly_monday',
    label: 'Weekly on Monday',
    description: 'Every Monday at 9:00 AM',
    type: 'CRON',
    cron_expression: '0 9 * * 1',
  },
  {
    id: 'monthly_1st',
    label: 'Monthly on the 1st',
    description: 'First day of each month',
    type: 'CRON',
    cron_expression: '0 0 1 * *',
  },
];

/** Event trigger options for event automations */
export interface TriggerOption {
  value: string;
  label: string;
}

export const TRIGGER_OPTIONS: TriggerOption[] = [
  { value: 'before_start', label: 'Before Start' },
  { value: 'at_start', label: 'At Start' },
  { value: 'after_start', label: 'After Start' },
  { value: 'after_end', label: 'After End' },
  { value: 'on_complete', label: 'When Completed' },
  { value: 'on_cancel', label: 'When Canceled' },
];

/** Offset presets for event automations */
export interface OffsetPreset {
  value: number;
  label: string;
}

export const OFFSET_PRESETS: OffsetPreset[] = [
  { value: 0, label: 'Immediately' },
  { value: 5, label: '5 min' },
  { value: 10, label: '10 min' },
  { value: 15, label: '15 min' },
  { value: 30, label: '30 min' },
  { value: 60, label: '1 hour' },
];

/**
 * Get a schedule preset by ID
 */
export const getSchedulePreset = (id: string): SchedulePreset | undefined => {
  return SCHEDULE_PRESETS.find((preset) => preset.id === id);
};

/**
 * Get schedule description for display
 */
export const getScheduleDescription = (
  scheduleMode: 'preset' | 'onetime' | 'advanced',
  selectedPreset: string,
  runAtDate?: string,
  runAtTime?: string,
  customCron?: string
): string => {
  if (scheduleMode === 'onetime') {
    if (runAtDate && runAtTime) {
      return `Once on ${new Date(`${runAtDate}T${runAtTime}`).toLocaleString()}`;
    }
    return 'Select date and time';
  }
  if (scheduleMode === 'advanced') {
    return `Custom: ${customCron || '0 0 * * *'}`;
  }
  const preset = getSchedulePreset(selectedPreset);
  return preset?.description || 'Select a schedule';
};

/**
 * Get event timing description for display
 */
export const getEventTimingDescription = (
  selectedTrigger: string,
  selectedOffset: number
): string => {
  const trigger = TRIGGER_OPTIONS.find((t) => t.value === selectedTrigger);
  if (!trigger) return 'Select timing';

  if (selectedTrigger === 'on_complete') return 'When event is completed';
  if (selectedTrigger === 'on_cancel') return 'When event is canceled';

  if (selectedOffset === 0) {
    if (['before_start', 'at_start', 'after_start'].includes(selectedTrigger)) {
      return 'At event start';
    }
    if (selectedTrigger === 'after_end') return 'At event end';
  }

  const offsetLabel = OFFSET_PRESETS.find((o) => o.value === selectedOffset)?.label || `${selectedOffset} min`;
  if (selectedTrigger === 'before_start') return `${offsetLabel} before event starts`;
  if (['at_start', 'after_start'].includes(selectedTrigger)) return `${offsetLabel} after event starts`;
  if (selectedTrigger === 'after_end') return `${offsetLabel} after event ends`;

  return trigger.label;
};