import type { ClientOptions, InferSessionFromClient, InferUserFromClient } from 'better-auth/client'
import type { RuntimeAuthConfig } from '~/types/auth'
import { defu } from 'defu'
import { useAuthClient } from '~/composables/auth/useAuthClient'

// Global state for auth
const session = ref<InferSessionFromClient<ClientOptions> | null>(null)
const user = ref<InferUserFromClient<ClientOptions> | null>(null)
const sessionFetching = import.meta.server ? ref(false) : ref(false)
const jwt = ref<string | null>(null)
const organizations = ref<
  {
    id: string
    name: string
    createdAt: Date
    slug: string
    metadata?: Record<string, unknown>
    logo?: string | null
  }[]
>([])
const selectedOrganization = ref<{
  id: string
  name: string
  createdAt: Date
  slug: string
  metadata?: Record<string, unknown>
  logo?: string | null
} | null>(null)
const activeMember = ref<{ role: string } | null>(null)

export function useAuthState() {
  const { client } = useAuthClient()
  const route = useRoute()

  const options = defu(useRuntimeConfig().public.auth as Partial<RuntimeAuthConfig>, {
    redirectUserTo: '/',
    redirectGuestTo: '/login'
  })

  const headers = import.meta.server ? useRequestHeaders() : undefined

  async function fetchSession(targetPath?: string) {
    if (sessionFetching.value) {
      console.log('already fetching session')
      return
    }
    sessionFetching.value = true
    const { data } = await client.getSession({
      fetchOptions: {
        headers
      }
    })
    session.value = data?.session || null
    user.value = data?.user || null
    sessionFetching.value = false

    // Only fetch JWT and organizations if we have a session and not on public routes
    if (session.value && !isPublicPath(targetPath)) {
      await fetchJwtAndOrganizations()
    }

    return data
  }

  async function fetchJwtAndOrganizations() {
    // Fetch JWT
    const tokenResult = await client.token()
    jwt.value = tokenResult.data?.token ?? null

    // Fetch organization
    const orgResult = await client.organization.list({
      fetchOptions: {
        headers
      }
    })
    organizations.value = orgResult.data ?? []

    if (!selectedOrganization.value && organizations.value.length > 0) {
      selectedOrganization.value = organizations.value[0]
    }

    // Fetch active member
    const activeMemberResult = await client.organization.getActiveMember({
      fetchOptions: {
        headers
      }
    })
    activeMember.value = activeMemberResult.data || null
  }

  function isPublicPath(path?: string) {
    const finalPath = path ?? route.path
    const publicRoutes = ['/login', '/signup', '/accept-invitation']
    return publicRoutes.some((path) => finalPath.startsWith(path))
  }

  // Watch organization changes
  watch(
    () => selectedOrganization.value,
    async (newValue) => {
      if (newValue) {
        await client.organization.setActive({
          organizationId: newValue?.id
        })
      }
    }
  )

  // Client-side session listening
  if (import.meta.client) {
    client.$store.listen('$sessionSignal', async (signal) => {
      if (!signal) return
      await fetchSession()
    })
  }

  return {
    session,
    user,
    sessionFetching,
    jwt,
    organizations,
    selectedOrganization,
    activeMember,
    options,
    fetchSession,
    isPublicPath,
    loggedIn: computed(() => !!session.value)
  }
}