import { computed, ref } from 'vue'
import { defineStore } from 'pinia'
import {
  AUTH_EXPIRED_EVENT,
  AUTH_UPDATED_EVENT,
  apiRequest,
  clearAccessToken,
  refreshSession,
  setAccessToken,
} from '@/lib/api'
import type { AuthResponse, AuthUser } from '@/types/api'
import type { Profile } from '@/types/database'

export const useAuthStore = defineStore('auth', () => {
  const user = ref<AuthUser | null>(null)
  const profile = ref<Profile | null>(null)
  const loading = ref(true)
  let listenersAttached = false

  const isLoggedIn = computed(() => !!user.value)
  const isAdmin = computed(() => profile.value?.role === 'admin')

  function applyAuth(auth: AuthResponse) {
    setAccessToken(auth.access_token)
    user.value = auth.user
    profile.value = auth.profile
  }

  function clearAuth() {
    clearAccessToken()
    user.value = null
    profile.value = null
  }

  async function login(email: string, password: string) {
    const auth = await apiRequest<AuthResponse>('/auth/login', {
      method: 'POST',
      auth: false,
      body: { email, password },
    })
    applyAuth(auth)
  }

  async function register(email: string, password: string, username: string) {
    await apiRequest('/auth/register', {
      method: 'POST',
      auth: false,
      body: { email, password, username },
    })
  }

  async function logout() {
    try {
      await apiRequest('/auth/logout', { method: 'POST', retry: false })
    } finally {
      clearAuth()
    }
  }

  async function updateUsername(username: string) {
    const updatedProfile = await apiRequest<Profile>('/profiles/me', {
      method: 'PATCH',
      body: { username },
    })
    profile.value = updatedProfile
  }

  async function updatePassword(password: string) {
    const auth = await apiRequest<AuthResponse>('/auth/password', {
      method: 'PATCH',
      body: { password },
    })
    applyAuth(auth)
  }

  async function sendPasswordReset(email: string) {
    await apiRequest('/auth/forgot-password', {
      method: 'POST',
      auth: false,
      body: { email },
    })
  }

  async function initialize() {
    if (!listenersAttached) {
      window.addEventListener(AUTH_UPDATED_EVENT, event => {
        applyAuth((event as CustomEvent<AuthResponse>).detail)
      })
      window.addEventListener(AUTH_EXPIRED_EVENT, clearAuth)
      listenersAttached = true
    }

    try {
      applyAuth(await refreshSession())
    } catch {
      clearAuth()
    } finally {
      loading.value = false
    }
  }

  return {
    user,
    profile,
    loading,
    isLoggedIn,
    isAdmin,
    login,
    register,
    logout,
    updateUsername,
    updatePassword,
    sendPasswordReset,
    initialize,
  }
})