import { ApolloClient, from, HttpLink, InMemoryCache } from '@apollo/client/core'
import { setContext } from '@apollo/client/link/context'
import { DefaultApolloClient } from '@vue/apollo-composable'

export default defineNuxtPlugin((nuxtApp) => {
  const config = useRuntimeConfig()

  // Determine API URL based on current host
  const getApiUrl = () => {
    if (typeof window === 'undefined') {
      return config.public.apiBase
    }

    const hostname = window.location.hostname

    // If running on localhost, use localhost:8080
    if (hostname === 'localhost' || hostname === '127.0.0.1') {
      return 'http://localhost:8080'
    }

    // If running on schemas.unbound.se, use the same domain
    if (hostname === 'schemas.unbound.se') {
      return 'https://schemas.unbound.se'
    }

    // Fallback to config or construct from current location
    return config.public.apiBase || `${window.location.protocol}//${window.location.host}`
  }

  // HTTP link for GraphQL endpoint
  const httpLink = new HttpLink({
    uri: `${getApiUrl()}/query`,
  })

  // Auth link to add authorization header
  const authLink = setContext(async (_, { headers }) => {
    try {
      // Access Auth0 from the global app instance
      const auth0Instance = (nuxtApp.vueApp.config.globalProperties as any).$auth0

      if (auth0Instance?.isAuthenticated?.value) {
        // Get the access token for API calls
        const token = await auth0Instance.getAccessTokenSilently()

        if (token) {
          return {
            headers: {
              ...headers,
              authorization: `Bearer ${token}`,
            },
          }
        }
      }
    } catch (error: any) {
      // Handle consent required error
      if (error?.error === 'consent_required') {
        console.warn('[Apollo] Consent required, redirecting to login...')
        const auth0Instance = (nuxtApp.vueApp.config.globalProperties as any).$auth0
        // Trigger login with consent
        await auth0Instance.loginWithRedirect({
          authorizationParams: {
            prompt: 'consent',
          },
        })
      } else if (error?.error === 'login_required') {
        console.warn('[Apollo] Login required, redirecting...')
        const auth0Instance = (nuxtApp.vueApp.config.globalProperties as any).$auth0
        await auth0Instance.loginWithRedirect()
      } else {
        console.error('[Apollo] Failed to get Auth0 token:', error)
      }
    }

    return { headers }
  })

  // Create Apollo client
  const apolloClient = new ApolloClient({
    link: from([authLink, httpLink]),
    cache: new InMemoryCache(),
  })

  // Provide Apollo client to the app
  nuxtApp.vueApp.provide(DefaultApolloClient, apolloClient)

  return {
    provide: {
      apolloClient,
    },
  }
})