import { computed, ref } from "vue";
import { defineStore } from "pinia";
import apiClient from "@/api/client";
import type { AuthenticatedUser, LoginResponse } from "@/types";

const USER_STORAGE_KEY = "live-recorder-user";
const TOKEN_STORAGE_KEY = "live-recorder-token";

function readStoredValue(key: string) {
  return localStorage.getItem(key) ?? sessionStorage.getItem(key);
}

function clearStoredSession() {
  [localStorage, sessionStorage].forEach((storage) => {
    storage.removeItem(TOKEN_STORAGE_KEY);
    storage.removeItem(USER_STORAGE_KEY);
  });
}

export const useAuthStore = defineStore("auth", () => {
  const token = ref(readStoredValue(TOKEN_STORAGE_KEY) ?? "");
  const user = ref<AuthenticatedUser | null>(
    (() => {
      const raw = readStoredValue(USER_STORAGE_KEY);
      return raw ? (JSON.parse(raw) as AuthenticatedUser) : null;
    })()
  );

  const isAuthenticated = computed(() => Boolean(token.value));

  function persistSession(session: LoginResponse, rememberMe: boolean) {
    token.value = session.token;
    user.value = session.user;
    clearStoredSession();
    const storage = rememberMe ? localStorage : sessionStorage;
    storage.setItem(TOKEN_STORAGE_KEY, session.token);
    storage.setItem(USER_STORAGE_KEY, JSON.stringify(session.user));
  }

  function clearSession() {
    token.value = "";
    user.value = null;
    clearStoredSession();
  }

  async function login(username: string, password: string, rememberMe: boolean) {
    const { data } = await apiClient.post<LoginResponse>("/auth/login", {
      username,
      password,
      rememberMe
    });

    persistSession(data, rememberMe);
    return data;
  }

  async function logout() {
    try {
      await apiClient.post("/auth/logout");
    } finally {
      clearSession();
    }
  }

  async function changePassword(currentPassword: string, newPassword: string) {
    await apiClient.post("/auth/change-password", {
      currentPassword,
      newPassword
    });
    clearSession();
  }

  return {
    token,
    user,
    isAuthenticated,
    login,
    logout,
    changePassword,
    clearSession
  };
});