import type { SyncProduct } from '@/types/sync'

const API_VERSION = 'v4'

function normalizeHandle(ref: string): string {
  return ref
    .toLowerCase()
    .replace(/[^a-z0-9]+/g, '-')
    .replace(/^-+|-+$/g, '')
}

/**
 * Parse des lignes brutes Google Sheets en SyncProduct[].
 * Colonnes : A=Référence, B=Nom, C=Description, D=Prix, E=Stock, F=Statut
 * Exporté pour les tests unitaires.
 */
export function parseSheetRows(rows: string[][]): SyncProduct[] {
  return rows
    .map((row): SyncProduct | null => {
      const ref = row[0]?.trim()
      if (!ref) return null

      const rawPrice = (row[3] ?? '').replace(',', '.').trim()
      const price = parseFloat(rawPrice || '0')

      return {
        ref,
        handle: normalizeHandle(ref),
        title: row[1]?.trim() || ref,
        description: row[2]?.trim() || '',
        price: isNaN(price) ? '0.00' : price.toFixed(2),
        stock: parseInt(row[4] ?? '0', 10) || 0,
        status: (row[5] ?? '').toLowerCase().includes('inac') ? 'draft' : 'active',
      }
    })
    .filter((p): p is SyncProduct => p !== null)
}

/**
 * Lit tous les produits depuis Google Sheets via l'API v4.
 * Utilise un service account (GOOGLE_SERVICE_ACCOUNT_EMAIL + GOOGLE_PRIVATE_KEY).
 */
export async function readSheetProducts(): Promise<SyncProduct[]> {
  const email = process.env.GOOGLE_SERVICE_ACCOUNT_EMAIL
  const key = process.env.GOOGLE_PRIVATE_KEY?.replace(/\\n/g, '\n')
  const sheetId = process.env.GOOGLE_SHEETS_ID
  const sheetName = process.env.GOOGLE_SHEETS_TAB ?? 'Produits'

  if (!email || !key || !sheetId) {
    throw new Error('Variables GOOGLE_SERVICE_ACCOUNT_EMAIL, GOOGLE_PRIVATE_KEY et GOOGLE_SHEETS_ID requises')
  }

  const { google } = await import('googleapis')

  const auth = new google.auth.GoogleAuth({
    credentials: { client_email: email, private_key: key },
    scopes: ['https://www.googleapis.com/auth/spreadsheets.readonly'],
  })

  const sheets = google.sheets({ version: API_VERSION, auth })

  const response = await sheets.spreadsheets.values.get({
    spreadsheetId: sheetId,
    range: `${sheetName}!A2:F`,  // A2 = skip header row
  })

  const rows = (response.data.values ?? []) as string[][]
  return parseSheetRows(rows)
}