import { defineStore } from "pinia";
import { ref } from "vue";
import { getLoginKey, login as apiLogin, devLogin, fetchMe } from "../api/auth";
import { setToken, clearToken, getToken } from "../utils/auth";
import { encryptLoginPayload } from "../utils/loginCrypto";
import type { UserInfo } from "../types/api";
import { useStudyStore } from "./study";
import { useSessionStore } from "./session";

export const useAuthStore = defineStore("auth", () => {
  const LAST_LOGIN_EMAIL_KEY = "ctms_last_login_email";
  const allowInsecureDevLogin =
    import.meta.env.VITE_RUNTIME_ENV === "development" &&
    import.meta.env.VITE_ALLOW_INSECURE_DEV_LOGIN === "true";
  const token = ref<string | null>(getToken());
  const user = ref<UserInfo | null>(null);
  const loading = ref(false);
  const forceLogin = ref(false);

  const login = async (email: string, password: string) => {
    loading.value = true;
    try {
      const { data } =
        allowInsecureDevLogin && !window.isSecureContext
          ? await devLogin({ email, password })
          : await encryptedLogin(email, password);
      token.value = data.access_token;
      await setToken(data.access_token);
      useSessionStore().resetActivity();
      localStorage.setItem(LAST_LOGIN_EMAIL_KEY, email);
      const me = await fetchMeAction();
      const studyStore = useStudyStore();
      const userKey = me?.email || email;
      await studyStore.restoreStudyForUser(userKey, { preferActive: me?.is_admin });
      await studyStore.loadCurrentStudyPermissions().catch(() => {});
      forceLogin.value = false;
    } finally {
      loading.value = false;
    }
  };

  const encryptedLogin = async (email: string, password: string) => {
    const { data: loginKey } = await getLoginKey();
    const ciphertext = await encryptLoginPayload(loginKey.public_key, {
      email,
      password,
      challenge: loginKey.challenge,
    });
    return apiLogin({
      key_id: loginKey.key_id,
      challenge: loginKey.challenge,
      ciphertext,
    });
  };

  const fetchMeAction = async () => {
    const { data } = await fetchMe();
    user.value = data;
    if (data?.email) {
      localStorage.setItem(LAST_LOGIN_EMAIL_KEY, data.email);
    }
    return data;
  };

  const logout = async () => {
    const studyStore = useStudyStore();
    const sessionStore = useSessionStore();
    const userKey = user.value?.email || localStorage.getItem(LAST_LOGIN_EMAIL_KEY) || "";
    studyStore.rememberCurrentStudyForUser(userKey);
    token.value = null;
    user.value = null;
    forceLogin.value = false;
    sessionStore.resetActivity();
    await clearToken();
    studyStore.clearCurrentStudy();
  };

  return {
    token,
    user,
    loading,
    forceLogin,
    login,
    fetchMe: fetchMeAction,
    logout,
    setToken: (newToken: string) => {
      token.value = newToken;
    },
    requestReLogin: () => {
      forceLogin.value = true;
    },
  };
});