/**
 * Shared interpretation of a single spreadsheet cell for the bulk generator.
 *
 * The bulk page has always advertised URL, vCard, geo, phone and text support,
 * but the save path hardcoded contentType 'URL'. The result was a code that
 * scanned as a phone number in the downloaded SVG and as a broken link in the
 * dashboard - the same row, two different codes.
 *
 * Both the client (which renders the SVG) and the API payload now go through
 * this one function, so what is previewed, downloaded and stored cannot drift.
 */

export type BulkContentType = 'URL' | 'PHONE' | 'GEO' | 'VCARD' | 'TEXT';

export interface DetectedContent {
  contentType: BulkContentType;
  /** Shape expected by /api/qrs for this contentType. */
  content: Record<string, any>;
  /** Exactly what the QR modules should encode. */
  qrValue: string;
}

const URL_RE = /^https?:\/\/\S+$/i;
const PHONE_RE = /^\+?[\d][\d\s()/.-]{5,}$/;
const GEO_RE = /^\s*(-?\d+(?:\.\d+)?)\s*,\s*(-?\d+(?:\.\d+)?)\s*(?:,\s*(.+))?$/;

/**
 * Cells do not arrive as strings. ExcelJS hands back numbers, Dates and rich
 * text objects, and calling .substring on those is how the preview table used
 * to throw on a perfectly valid file.
 */
export function cellToString(value: unknown): string {
  if (value === null || value === undefined) return '';
  if (typeof value === 'string') return value.trim();
  if (typeof value === 'number' || typeof value === 'boolean') return String(value);
  if (value instanceof Date) return value.toISOString();
  if (typeof value === 'object') {
    const v = value as any;
    // ExcelJS hyperlink / formula / rich-text cell values.
    if (typeof v.text === 'string') return v.text.trim();
    if (typeof v.hyperlink === 'string') return v.hyperlink.trim();
    if (typeof v.result === 'string' || typeof v.result === 'number') return String(v.result).trim();
    if (Array.isArray(v.richText)) return v.richText.map((r: any) => r?.text ?? '').join('').trim();
  }
  return String(value).trim();
}

export function detectBulkContent(raw: unknown): DetectedContent {
  const value = cellToString(raw);

  if (!value) {
    return { contentType: 'TEXT', content: { text: '' }, qrValue: '' };
  }

  if (URL_RE.test(value)) {
    return { contentType: 'URL', content: { url: value }, qrValue: value };
  }

  // A bare domain is what people actually put in spreadsheets. Treating it as
  // plain text produces a code that does nothing when scanned.
  if (/^(www\.|[a-z0-9-]+\.[a-z]{2,}(\/|$))/i.test(value) && !value.includes(' ')) {
    const url = `https://${value}`;
    return { contentType: 'URL', content: { url }, qrValue: url };
  }

  const geo = GEO_RE.exec(value);
  if (geo) {
    const latitude = parseFloat(geo[1]);
    const longitude = parseFloat(geo[2]);
    if (Math.abs(latitude) <= 90 && Math.abs(longitude) <= 180) {
      const label = geo[3]?.trim() || '';
      return {
        contentType: 'GEO',
        content: { latitude, longitude, label },
        qrValue: `geo:${latitude},${longitude}${label ? `?q=${encodeURIComponent(label)}` : ''}`,
      };
    }
  }

  // firstName,lastName,email,phone,organization,title
  if (value.includes('@') && value.split(',').length >= 3) {
    const [firstName = '', lastName = '', email = '', phone = '', organization = '', title = ''] =
      value.split(',').map((p) => p.trim());
    return {
      contentType: 'VCARD',
      content: { firstName, lastName, email, phone, organization, title },
      qrValue: buildVcard({ firstName, lastName, email, phone, organization, title }),
    };
  }

  if (PHONE_RE.test(value)) {
    const phone = value.replace(/[\s()/.-]/g, '');
    return { contentType: 'PHONE', content: { phone }, qrValue: `tel:${phone}` };
  }

  return { contentType: 'TEXT', content: { text: value }, qrValue: value };
}

/**
 * Kept byte-identical to the vCard the API builds for a static code, so the
 * downloaded SVG and the stored code encode the same thing.
 */
export function buildVcard(c: {
  firstName?: string;
  lastName?: string;
  email?: string;
  phone?: string;
  organization?: string;
  title?: string;
}): string {
  return `BEGIN:VCARD
VERSION:3.0
FN:${c.firstName || ''} ${c.lastName || ''}
N:${c.lastName || ''};${c.firstName || ''};;;
${c.organization ? `ORG:${c.organization}` : ''}
${c.title ? `TITLE:${c.title}` : ''}
${c.email ? `EMAIL:${c.email}` : ''}
${c.phone ? `TEL:${c.phone}` : ''}
END:VCARD`;
}

/**
 * A saved design preset and a stored QR style describe the same design with
 * different field names for the logo. Converting once, here, is why a preset
 * applied to a batch still shows up on the dashboard afterwards.
 */
export function presetStyleToQrStyle(style: any | null | undefined): Record<string, any> | undefined {
  if (!style) return undefined;

  const {
    logoUrl,
    logoSize,
    foregroundColor,
    backgroundColor,
    moduleShape,
    eyeFrameShape,
    eyeBallShape,
    gradientMode,
    gradientTo,
    frameType,
  } = style;

  return {
    foregroundColor: foregroundColor || '#000000',
    backgroundColor: backgroundColor || '#FFFFFF',
    cornerStyle: 'square' as const,
    size: 200,
    ...(moduleShape ? { moduleShape } : {}),
    ...(eyeFrameShape ? { eyeFrameShape } : {}),
    ...(eyeBallShape ? { eyeBallShape } : {}),
    ...(gradientMode ? { gradientMode } : {}),
    ...(gradientTo ? { gradientTo } : {}),
    ...(frameType ? { frameType } : {}),
    ...(logoUrl
      ? {
          imageSettings: {
            src: logoUrl,
            height: logoSize ?? 24,
            width: logoSize ?? 24,
            excavate: true,
          },
        }
      : {}),
  };
}