# All files / store auth.ts

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     /**
     * Authentication Store
     *
     * Manages user authentication state, Discord OAuth flow, and JWT tokens.
     * Persists auth state to localStorage for session persistence.
     */

    import { defineStore } from 'pinia'
    import { ref, computed } from 'vue'
    import type { DiscordUser, Team } from '~/types'

    export const useAuthStore = defineStore('auth', () => {
      // ============================================================================
      // State
      // ============================================================================

      const token = ref<string | null>(null)
      const refreshToken = ref<string | null>(null)
      const tokenExpiresAt = ref<number | null>(null)
      const user = ref<DiscordUser | null>(null)
      const teams = ref<Team[]>([])
      const isLoading = ref(false)
      const error = ref<string | null>(null)

      // ============================================================================
      // Getters
      // ============================================================================

      const isAuthenticated = computed(() => {
        return token.value !== null && user.value !== null
      })

      const isTokenValid = computed(() => {
        if (!tokenExpiresAt.value) return false
        return Date.now() < tokenExpiresAt.value
      })

      const needsRefresh = computed(() => {
        if (!tokenExpiresAt.value) return false
        // Refresh if token expires in less than 5 minutes
        return Date.now() > tokenExpiresAt.value - 5 * 60 * 1000
      })

      const currentUser = computed(() => user.value)
      const userTeams = computed(() => teams.value)
      const userId = computed(() => user.value?.id ?? null)

      // ============================================================================
      // Actions
      // ============================================================================

      /**
       * Initialize auth state from localStorage
       */
      function initializeAuth() {
        if (process.client) {
          const storedToken = localStorage.getItem('auth_token')
          const storedRefreshToken = localStorage.getItem('refresh_token')
          const storedExpiresAt = localStorage.getItem('token_expires_at')
          const storedUser = localStorage.getItem('user')
          const storedTeams = localStorage.getItem('teams')

          if (storedToken) token.value = storedToken
          if (storedRefreshToken) refreshToken.value = storedRefreshToken
          if (storedExpiresAt) tokenExpiresAt.value = parseInt(storedExpiresAt)
          if (storedUser) user.value = JSON.parse(storedUser)
          if (storedTeams) teams.value = JSON.parse(storedTeams)

          // Check if token needs refresh
          if (needsRefresh.value && refreshToken.value) {
            refreshAccessToken()
          }
        }
      }

      /**
       * Set authentication data after successful login
       */
      function setAuth(data: {
        access_token: string
        refresh_token: string
        expires_in: number
        user: DiscordUser
        teams?: Team[]
      }) {
        token.value = data.access_token
        refreshToken.value = data.refresh_token
        tokenExpiresAt.value = Date.now() + data.expires_in * 1000
        user.value = data.user
        if (data.teams) teams.value = data.teams

        // Persist to localStorage
        if (process.client) {
          localStorage.setItem('auth_token', data.access_token)
          localStorage.setItem('refresh_token', data.refresh_token)
          localStorage.setItem('token_expires_at', tokenExpiresAt.value.toString())
          localStorage.setItem('user', JSON.stringify(data.user))
          if (data.teams) localStorage.setItem('teams', JSON.stringify(data.teams))
        }

        error.value = null
      }

      /**
       * Set user teams (loaded separately from login)
       */
      function setTeams(userTeams: Team[]) {
        teams.value = userTeams
        if (process.client) {
          localStorage.setItem('teams', JSON.stringify(userTeams))
        }
      }

      /**
       * Clear authentication data (logout)
       */
      function clearAuth() {
        token.value = null
        refreshToken.value = null
        tokenExpiresAt.value = null
        user.value = null
        teams.value = []
        error.value = null

        // Clear localStorage
        if (process.client) {
          localStorage.removeItem('auth_token')
          localStorage.removeItem('refresh_token')
          localStorage.removeItem('token_expires_at')
          localStorage.removeItem('user')
          localStorage.removeItem('teams')
        }
      }

      /**
       * Refresh access token using refresh token
       */
      async function refreshAccessToken() {
        if (!refreshToken.value) {
          clearAuth()
          return false
        }

        isLoading.value = true
        error.value = null

        try {
          const config = useRuntimeConfig()
          const response = await $fetch<{
            access_token: string
            expires_in: number
          }>(`${config.public.apiUrl}/api/auth/refresh`, {
            method: 'POST',
            body: {
              refresh_token: refreshToken.value,
            },
          })

          token.value = response.access_token
          tokenExpiresAt.value = Date.now() + response.expires_in * 1000

          // Update localStorage
          if (process.client) {
            localStorage.setItem('auth_token', response.access_token)
            localStorage.setItem('token_expires_at', tokenExpiresAt.value.toString())
          }

          return true
        } catch (err: any) {
          console.error('Failed to refresh token:', err)
          error.value = err.message || 'Failed to refresh authentication'
          clearAuth()
          return false
        } finally {
          isLoading.value = false
        }
      }

      /**
       * Redirect to Discord OAuth login
       */
      function loginWithDiscord() {
        const config = useRuntimeConfig()
        const clientId = config.public.discordClientId
        const redirectUri = config.public.discordRedirectUri

        if (!clientId || !redirectUri) {
          error.value = 'Discord OAuth not configured'
          console.error('Missing Discord OAuth configuration')
          return
        }

        // Generate random state for CSRF protection
        const state = Math.random().toString(36).substring(7)
        if (process.client) {
          sessionStorage.setItem('oauth_state', state)
        }

        // Build Discord OAuth URL
        const params = new URLSearchParams({
          client_id: clientId,
          redirect_uri: redirectUri,
          response_type: 'code',
          scope: 'identify email',
          state,
        })

        const authUrl = `https://discord.com/api/oauth2/authorize?${params.toString()}`

        // Redirect to Discord
        if (process.client) {
          window.location.href = authUrl
        }
      }

      /**
       * Handle Discord OAuth callback
       */
      async function handleDiscordCallback(code: string, state: string) {
        if (process.client) {
          const storedState = sessionStorage.getItem('oauth_state')
          if (!storedState || storedState !== state) {
            error.value = 'Invalid OAuth state - possible CSRF attack'
            return false
          }
          sessionStorage.removeItem('oauth_state')
        }

        isLoading.value = true
        error.value = null

        try {
          const config = useRuntimeConfig()
          const response = await $fetch<{
            access_token: string
            refresh_token: string
            expires_in: number
            user: DiscordUser
          }>(`${config.public.apiUrl}/api/auth/discord/callback`, {
            method: 'POST',
            body: { code, state },
          })

          setAuth(response)

          // Load user teams
          await loadUserTeams()

          return true
        } catch (err: any) {
          console.error('Discord OAuth callback failed:', err)
          error.value = err.message || 'Authentication failed'
          return false
        } finally {
          isLoading.value = false
        }
      }

      /**
       * Load user's teams from API
       */
      async function loadUserTeams() {
        if (!token.value) return

        try {
          const config = useRuntimeConfig()
          const response = await $fetch<{ teams: Team[] }>(
            `${config.public.apiUrl}/api/auth/me`,
            {
              headers: {
                Authorization: `Bearer ${token.value}`,
              },
            }
          )

          setTeams(response.teams)
        } catch (err: any) {
          console.error('Failed to load user teams:', err)
          // Don't set error - teams are optional
        }
      }

      /**
       * Logout user
       */
      function logout() {
        clearAuth()
        // Redirect to home page
        if (process.client) {
          navigateTo('/')
        }
      }

      // ============================================================================
      // Return Store API
      // ============================================================================

      return {
        // State
        token: readonly(token),
        refreshToken: readonly(refreshToken),
        user: readonly(user),
        teams: readonly(teams),
        isLoading: readonly(isLoading),
        error: readonly(error),

        // Getters
        isAuthenticated,
        isTokenValid,
        needsRefresh,
        currentUser,
        userTeams,
        userId,

        // Actions
        initializeAuth,
        setAuth,
        setTeams,
        clearAuth,
        refreshAccessToken,
        loginWithDiscord,
        handleDiscordCallback,
        loadUserTeams,
        logout,
      }
    })