import {
  PERSON_IMPORT_SOURCE_LABELS,
  PERSON_IMPORT_SOURCES,
  type PersonImportSource,
} from '@mento/shared';

export function normalizePersonImportSource(
  raw?: string | null,
): PersonImportSource {
  const v = String(raw ?? '')
    .trim()
    .toLowerCase();
  if (!v) return 'manual';
  if ((PERSON_IMPORT_SOURCES as readonly string[]).includes(v)) {
    return v as PersonImportSource;
  }
  if (/دیدار|didar/.test(v)) return 'didar';
  if (/ته.?حساب|tahesab|accounting/.test(v)) return 'tahesab';
  if (/اکسل|excel|xlsx|csv/.test(v)) return 'excel';
  if (/گوشی|phone|مخاطب|vcard|contact/.test(v)) return 'phone';
  if (/لید|lead|فرم/.test(v)) return 'lead_form';
  return 'other';
}

export function personImportSourceLabel(source: string): string {
  if (source in PERSON_IMPORT_SOURCE_LABELS) {
    return PERSON_IMPORT_SOURCE_LABELS[source as PersonImportSource];
  }
  return source || PERSON_IMPORT_SOURCE_LABELS.manual;
}

type SourceSnapshot = {
  importSource?: string | null;
  sourceRef?: string | null;
  previousImportSource?: string | null;
  previousSourceRef?: string | null;
  customFields?: unknown;
};

function didarIdFrom(customFields: unknown): string | null {
  if (!customFields || typeof customFields !== 'object') return null;
  const raw = (customFields as Record<string, unknown>).didarId;
  if (typeof raw === 'number' && Number.isFinite(raw)) return String(raw);
  if (typeof raw === 'string' && raw.trim()) return raw.trim();
  return null;
}

/**
 * وقتی شخصِ موجود از منبع دیگری دوباره وارد می‌شود، منبع و کد فعلی را به‌عنوان «قبلی» نگه می‌دارد.
 * اگر منبع یکسان باشد (ورود مجدد از همان منبع)، مقادیر قبلی دست نمی‌خورند.
 */
export function carryPreviousSource(
  existing: SourceSnapshot,
  nextSource: PersonImportSource,
): { previousImportSource?: string | null; previousSourceRef?: string | null } {
  const currentSource = normalizePersonImportSource(existing.importSource);
  if (currentSource === nextSource) return {};
  let ref = existing.sourceRef?.trim() || null;
  let source: string = currentSource;
  if (!ref) {
    const didarId = didarIdFrom(existing.customFields);
    if (didarId && nextSource !== 'didar') {
      ref = didarId;
      source = 'didar';
    }
  }
  if (source === 'manual' && !ref) return {};
  return { previousImportSource: source, previousSourceRef: ref };
}

export function namesDiffer(
  aFirst: string,
  aLast: string,
  bFirst: string,
  bLast: string,
): boolean {
  const a = `${aFirst} ${aLast}`.trim().replace(/\s+/g, ' ');
  const b = `${bFirst} ${bLast}`.trim().replace(/\s+/g, ' ');
  return Boolean(a && b && a !== b);
}