import { serve } from 'https://deno.land/std@0.168.0/http/server.ts'
import { createClient } from 'https://esm.sh/@supabase/supabase-js@2'

interface AcceptInviteRequest {
  team_id: string
}

serve(async (req) => {
  // Handle OPTIONS requests
  if (req.method === 'OPTIONS') {
    return new Response('ok')
  }

  try {
    // Get user from request (they should be authenticated after Supabase invite flow)
    const authHeader = req.headers.get('Authorization')
    if (!authHeader) {
      return new Response(
        JSON.stringify({ error: 'Missing authorization header' }),
        {
          status: 401,
          headers: { 'Content-Type': 'application/json' },
        },
      )
    }

    // Initialize Supabase clients
    const supabaseAdmin = createClient(
      Deno.env.get('SUPABASE_URL') ?? '',
      Deno.env.get('SUPABASE_SERVICE_ROLE_KEY') ?? '',
      {
        auth: {
          autoRefreshToken: false,
          persistSession: false,
        },
      },
    )

    const supabaseUser = createClient(
      Deno.env.get('SUPABASE_URL') ?? '',
      Deno.env.get('SUPABASE_ANON_KEY') ?? '',
      {
        auth: {
          autoRefreshToken: false,
          persistSession: false,
        },
        global: {
          headers: {
            Authorization: authHeader,
          },
        },
      },
    )

    // Get current user
    const { data: { user }, error: userError } = await supabaseUser.auth.getUser()
    if (userError || !user) {
      return new Response(
        JSON.stringify({ error: 'Invalid or expired token' }),
        {
          status: 401,
          headers: { 'Content-Type': 'application/json' },
        },
      )
    }

    // Parse request body
    const { team_id }: AcceptInviteRequest = await req.json()

    if (!team_id) {
      return new Response(
        JSON.stringify({ error: 'Missing team_id' }),
        {
          status: 400,
          headers: { 'Content-Type': 'application/json' },
        },
      )
    }

    // Check if user has invitation metadata for this team
    if (!user.user_metadata?.team_id || user.user_metadata.team_id !== team_id) {
      return new Response(
        JSON.stringify({
          error: 'INVITE_NOT_FOUND',
          message: 'No pending invitation found for this user and team',
        }),
        {
          status: 404,
          headers: { 'Content-Type': 'application/json' },
        },
      )
    }

    // Check if user is already a member of this team
    const { data: existingMember } = await supabaseAdmin
      .from('team_members')
      .select('id')
      .eq('team_id', team_id)
      .eq('user_id', user.id)
      .single()

    if (existingMember) {
      return new Response(
        JSON.stringify({
          error: 'ALREADY_MEMBER',
          message: 'User is already a member of this team',
        }),
        {
          status: 409,
          headers: { 'Content-Type': 'application/json' },
        },
      )
    }

    // Get team info
    const { data: team, error: teamError } = await supabaseAdmin
      .from('teams')
      .select('id, name')
      .eq('id', team_id)
      .single()

    if (teamError || !team) {
      return new Response(
        JSON.stringify({ error: 'Team not found' }),
        {
          status: 404,
          headers: { 'Content-Type': 'application/json' },
        },
      )
    }

    // Get the role from invitation metadata
    const invitedRole = user.user_metadata?.role || 'member'

    // Add user to team
    const { error: memberError } = await supabaseAdmin
      .from('team_members')
      .insert({
        team_id: team_id,
        user_id: user.id,
        role: invitedRole,
      })

    if (memberError) {
      return new Response(
        JSON.stringify({
          error: 'Failed to add user to team',
          details: memberError.message,
        }),
        {
          status: 500,
          headers: { 'Content-Type': 'application/json' },
        },
      )
    }

    // Return success response
    return new Response(
      JSON.stringify({
        success: true,
        team: {
          id: team.id,
          name: team.name,
        },
        user: {
          id: user.id,
          email: user.email,
          role: invitedRole,
        },
      }),
      {
        headers: { 'Content-Type': 'application/json' },
      },
    )
  }
  catch (error) {
    console.error('Unexpected error in accept-invite:', error)

    return new Response(
      JSON.stringify({
        error: 'Internal server error',
        message: error instanceof Error ? error.message : 'Unknown error',
      }),
      {
        status: 500,
        headers: { 'Content-Type': 'application/json' },
      },
    )
  }
})