// apps/mobile/lib/auth-context.tsx
// Supabase 세션 Context + 로그인 시 Expo Push 토큰 자동 등록

import { createContext, useContext, useEffect, useState, type ReactNode } from 'react'
import type { Session, User } from '@supabase/supabase-js'
import { supabase } from './supabase'
import { registerPushToken } from './push'

interface AuthContextValue {
  session: Session | null
  user: User | null
  loading: boolean
  devBypass: () => void
}

const AuthContext = createContext<AuthContextValue>({
  session: null,
  user: null,
  loading: true,
  devBypass: () => {}
})

// DEV 전용 — 가짜 유저로 로그인 우회
const DEV_USER: User = {
  id: 'dev-user-00000',
  email: 'dev@d3ro.local',
  app_metadata: {},
  user_metadata: {},
  aud: 'authenticated',
  created_at: new Date().toISOString()
} as User

export function AuthProvider({ children }: { children: ReactNode }): React.ReactElement {
  const [session, setSession] = useState<Session | null>(null)
  const [loading, setLoading] = useState(true)

  useEffect(() => {
    supabase.auth
      .getSession()
      .then(({ data }) => {
        setSession(data.session)
        if (data.session?.user.id) {
          void registerPushToken(data.session.user.id)
        }
      })
      .finally(() => setLoading(false))

    const {
      data: { subscription }
    } = supabase.auth.onAuthStateChange((_event, newSession) => {
      setSession(newSession)
      if (newSession?.user.id) {
        void registerPushToken(newSession.user.id)
      }
    })

    return () => {
      subscription.unsubscribe()
    }
  }, [])

  const [devMode, setDevMode] = useState(false)

  function devBypass(): void {
    setDevMode(true)
  }

  const effectiveUser = devMode ? DEV_USER : (session?.user ?? null)

  return (
    <AuthContext.Provider value={{ session, user: effectiveUser, loading, devBypass }}>
      {children}
    </AuthContext.Provider>
  )
}

export function useAuth(): AuthContextValue {
  return useContext(AuthContext)
}