// packages/api-client/src/auth.ts
// Supabase Auth 래퍼. OAuth, session, 로그아웃.

import type { Session, User, Provider } from '@supabase/supabase-js'
import type { D3roSupabaseClient } from './client'

export type { Session, User }

export interface SignInOptions {
  provider: Extract<Provider, 'google' | 'github' | 'apple'>
  redirectTo: string
}

export async function signInWithOAuth(
  client: D3roSupabaseClient,
  options: SignInOptions
): Promise<{ url: string | null; error: string | null }> {
  const { data, error } = await client.auth.signInWithOAuth({
    provider: options.provider,
    options: {
      redirectTo: options.redirectTo
    }
  })
  return {
    url: data?.url ?? null,
    error: error?.message ?? null
  }
}

export async function signOut(client: D3roSupabaseClient): Promise<{ error: string | null }> {
  const { error } = await client.auth.signOut()
  return { error: error?.message ?? null }
}

export async function getSession(client: D3roSupabaseClient): Promise<Session | null> {
  const { data } = await client.auth.getSession()
  return data.session ?? null
}

export async function getUser(client: D3roSupabaseClient): Promise<User | null> {
  const { data } = await client.auth.getUser()
  return data.user ?? null
}

/**
 * 세션 변경 구독. 반환된 함수를 호출하면 구독 해제.
 */
export function onAuthStateChange(
  client: D3roSupabaseClient,
  callback: (session: Session | null) => void
): () => void {
  const { data } = client.auth.onAuthStateChange((_event, session) => {
    callback(session)
  })
  return () => {
    data.subscription.unsubscribe()
  }
}