export type MessageDelayUnit = 'minutes' | 'hours' | 'days' | 'weeks' | 'months';

export const MESSAGE_AUTOMATION_TRIGGERS = [
  'person_created',
  'lead_submitted',
  'deal_created',
  'deal_stage_changed',
  'deal_won',
  'deal_lost',
  'ticket_created',
  'ticket_resolved',
  'invoice_issued',
  'invoice_paid',
  'activity_created',
  'activity_done',
  'sms_link_clicked',
] as const;

export const MAX_MESSAGE_REPEAT = 10;
export const MAX_MESSAGE_SMS = 160;

export function delayMs(value: number, unit: MessageDelayUnit): number {
  const n = Math.max(0, Math.trunc(Number(value) || 0));
  if (unit === 'minutes') return n * 60_000;
  if (unit === 'hours') return n * 3_600_000;
  if (unit === 'days') return n * 86_400_000;
  if (unit === 'weeks') return n * 7 * 86_400_000;
  return n * 30 * 86_400_000;
}

export function addDelay(
  from: Date,
  value: number,
  unit: MessageDelayUnit,
): Date {
  const n = Math.max(0, Math.trunc(Number(value) || 0));
  if (unit === 'months') {
    const next = new Date(from.getTime());
    next.setMonth(next.getMonth() + n);
    return next;
  }
  return new Date(from.getTime() + delayMs(n, unit));
}

export function buildSendAts(
  now: Date,
  startValue: number,
  startUnit: MessageDelayUnit,
  repeatCount: number,
  intervalValue: number,
  intervalUnit: MessageDelayUnit,
): Date[] {
  const count = Math.min(
    MAX_MESSAGE_REPEAT,
    Math.max(1, Math.trunc(Number(repeatCount) || 1)),
  );
  const first = addDelay(now, startValue, startUnit);
  const times = [first];
  let cursor = first;
  for (let i = 1; i < count; i += 1) {
    cursor = addDelay(cursor, Math.max(1, intervalValue), intervalUnit);
    times.push(cursor);
  }
  return times;
}

export function applyMessageTemplate(
  text: string,
  vars: {
    title?: string;
    name?: string;
    phone?: string;
    date?: string;
    company?: string;
  },
): string {
  const map: Record<string, string> = {
    title: vars.title ?? '',
    عنوان: vars.title ?? '',
    نام: vars.name ?? '',
    name: vars.name ?? '',
    شماره: vars.phone ?? '',
    phone: vars.phone ?? '',
    تاریخ: vars.date ?? '',
    date: vars.date ?? '',
    شرکت: vars.company ?? '',
    company: vars.company ?? '',
  };
  return text.replace(/\{([^}]+)\}/g, (full, key: string) => {
    const next = map[key.trim()];
    return next === undefined ? full : next;
  });
}

export function clipSms(text: string): string {
  const trimmed = text.trim();
  if (trimmed.length <= MAX_MESSAGE_SMS) return trimmed;
  return `${trimmed.slice(0, MAX_MESSAGE_SMS - 1)}…`;
}

/** When this event happens, cancel leftover messages of these earlier triggers. */
export function cancelTriggersFor(
  trigger: (typeof MESSAGE_AUTOMATION_TRIGGERS)[number],
): (typeof MESSAGE_AUTOMATION_TRIGGERS)[number][] {
  if (trigger === 'invoice_paid') return ['invoice_issued'];
  if (trigger === 'ticket_resolved') return ['ticket_created'];
  if (trigger === 'deal_won' || trigger === 'deal_lost') {
    return ['deal_created', 'deal_stage_changed'];
  }
  if (trigger === 'activity_done') return ['activity_created'];
  return [];
}