// Shared authentication and GID utilities for shopify-new (GraphQL Admin API v2025-10)

export async function getShopifyNewAccessToken(os: any): Promise<{ accessToken: string, host: string, graphqlUrl: string }> {
  // Normalize shop URL
  let host = (os.marketplace_url || '').trim()
  if (!host) {
    throw new Error('No marketplace_url configured for this Order Source')
  }
  if (!/^https?:\/\//i.test(host)) host = `https://${host}`
  host = host.replace(/\/$/, '')
  if (!host.includes('.myshopify.com') && !host.includes('/admin')) {
    const shopName = host.replace(/^https?:\/\//i, '').split('.')[0]
    host = `https://${shopName}.myshopify.com`
  }

  const graphqlUrl = `${host}/admin/api/2025-10/graphql.json`
  let accessToken = ''

  // Try Client Credentials Grant first (preferred for shopify-new)
  const key = os.marketplace_key
  const secret = os.marketplace_secret
  if (key && secret) {
    try {
      const tokenRes: any = await $fetch(`${host}/admin/oauth/access_token`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
        body: `grant_type=client_credentials&client_id=${encodeURIComponent(key)}&client_secret=${encodeURIComponent(secret)}`
      })
      if (tokenRes?.access_token) {
        accessToken = tokenRes.access_token
        console.log('shopify-new: Authenticated via Client Credentials Grant')
      }
    } catch (err: any) {
      console.log('shopify-new: Client Credentials Grant failed, falling back to token:', err?.message)
    }
  }

  // Fallback to stored token
  if (!accessToken) {
    accessToken = os.marketplace_token || ''
  }

  if (!accessToken) {
    throw new Error('No access token available for shopify-new. Configure marketplace_key + marketplace_secret, or marketplace_token.')
  }

  return { accessToken, host, graphqlUrl }
}

// Execute a GraphQL query against the Shopify Admin API
export async function shopifyNewGraphQL(graphqlUrl: string, accessToken: string, query: string, variables: Record<string, any> = {}): Promise<any> {
  const res: any = await $fetch(graphqlUrl, {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      'X-Shopify-Access-Token': accessToken
    },
    body: { query, variables }
  })

  // Check for GraphQL-level errors
  if (res?.errors && res.errors.length > 0) {
    const errMsg = res.errors.map((e: any) => e.message).join('; ')
    throw new Error(`Shopify GraphQL error: ${errMsg}`)
  }

  return res
}

// Extract numeric ID from Shopify GID: "gid://shopify/Product/12345" -> "12345"
export function parseShopifyGid(gid: string): string {
  if (!gid) return ''
  const parts = String(gid).split('/')
  return parts[parts.length - 1]
}

// Build a GID from type and numeric ID: ("Location", "12345") -> "gid://shopify/Location/12345"
export function buildShopifyGid(type: string, id: string | number): string {
  if (String(id).startsWith('gid://')) return String(id)
  return `gid://shopify/${type}/${id}`
}