import { createContext, useContext, useState, useEffect, ReactNode } from 'react'
import { authApi, User, LoginRequest } from '../services/api'

interface AuthContextType {
  user: User | null
  isAuthenticated: boolean
  loading: boolean
  login: (data: LoginRequest) => Promise<void>
  logout: () => Promise<void>
}

const AuthContext = createContext<AuthContextType | undefined>(undefined)

export function AuthProvider({ children }: { children: ReactNode }) {
  const [user, setUser] = useState<User | null>(null)
  const [loading, setLoading] = useState(true)

  useEffect(() => {
    // Check for existing token on mount
    const token = localStorage.getItem('token')
    const storedUser = localStorage.getItem('user')

    if (token && storedUser) {
      try {
        setUser(JSON.parse(storedUser))
      } catch {
        localStorage.removeItem('token')
        localStorage.removeItem('user')
      }
    }
    setLoading(false)
  }, [])

  const login = async (data: LoginRequest) => {
    const response = await authApi.login(data)
    localStorage.setItem('token', response.access_token)
    localStorage.setItem('user', JSON.stringify(response.user))
    setUser(response.user)
  }

  const logout = async () => {
    try {
      await authApi.logout()
    } catch {
      // Ignore errors on logout
    } finally {
      localStorage.removeItem('token')
      localStorage.removeItem('user')
      setUser(null)
    }
  }

  return (
    <AuthContext.Provider
      value={{
        user,
        isAuthenticated: !!user,
        loading,
        login,
        logout,
      }}
    >
      {children}
    </AuthContext.Provider>
  )
}

export function useAuth() {
  const context = useContext(AuthContext)
  if (context === undefined) {
    throw new Error('useAuth must be used within an AuthProvider')
  }
  return context
}