/**
 * AuthUI — wires the login/register form.
 */

import { Auth } from '../auth/Auth.js';

export class AuthUI {
  constructor({ onEnter, adminOnly = false } = {}) {
    this.onEnter = onEnter;
    this.adminOnly = adminOnly;
    this.mode = 'login';
    this._bind();
    if (this.adminOnly) this._applyAdminMode();
    this.setMode('login');
  }

  /** Hide the Register tab, Guest button, and tighten the wording for /admin. */
  _applyAdminMode() {
    const tabReg = this.$('tabRegister');
    if (tabReg) tabReg.style.display = 'none';
    const tabLogin = this.$('tabLogin');
    if (tabLogin) tabLogin.textContent = 'Admin sign-in';
    const guestRow = document.querySelector('.auth-card .guest');
    if (guestRow) guestRow.style.display = 'none';
    // Tighten the auth card heading.
    const h2 = document.querySelector('.auth-card h2');
    if (h2) h2.textContent = 'ECHO · Admin';
    const sub = this.$('authSub');
    if (sub) sub.textContent = 'Restricted area. Admin credentials required.';
  }

  $(id) { return document.getElementById(id); }

  _bind() {
    this.$('tabLogin').addEventListener('click', () => this.setMode('login'));
    this.$('tabRegister').addEventListener('click', () => this.setMode('register'));
    // Form submit (Enter key + button[type=submit])
    this.$('authForm').addEventListener('submit', e => this._submit(e));
    // Belt-and-braces: also handle direct button click in case the form's submit event is swallowed
    this.$('authBtn').addEventListener('click', e => { e.preventDefault(); this._submit(e); });
    this.$('forgotBtn').addEventListener('click', () => this._forgot());
    this.$('guestBtn').addEventListener('click', () => { Auth.logout().catch(()=>{});this.hide(); this.onEnter?.(true); });
    this.$('signOutBtn').addEventListener('click', () => { Auth.logout().catch(()=>{});location.reload(); });
    console.log('[Auth] UI bound successfully');
  }

  setMode(m) {
    // In adminOnly mode, ignore register and force login.
    if (this.adminOnly) m = 'login';
    this.mode = m;
    this.$('tabLogin').classList.toggle('active', m === 'login');
    this.$('tabRegister').classList.toggle('active', m === 'register');
    this.$('fNameRow').style.display = m === 'register' ? 'block' : 'none';
    this.$('fPwd2Row').style.display = m === 'register' ? 'block' : 'none';
    this.$('authBtn').textContent = m === 'login' ? 'Login' : 'Create account';
    if (!this.adminOnly) {
      this.$('authSub').textContent = m === 'login'
        ? 'Welcome back — sign in to resume.'
        : 'Create an account — track stars, climb the leaderboard.';
    }
    this.$('forgotBtn').style.display = (m === 'login' && !this.adminOnly) ? 'inline' : 'none';
    this.$('fErr').textContent = '';
  }

  async _submit(e) {
    if (e?.preventDefault) e.preventDefault();
    const email = this.$('fEmail').value;
    const pwd   = this.$('fPwd').value;
    const pwd2  = this.$('fPwd2').value;
    const name  = this.$('fName').value;
    console.log(`[Auth] ${this.mode} submit: email="${email}"  pwd.len=${pwd.length}`);

    if (!email) {
      this.$('fErr').style.color = 'var(--coral)';
      this.$('fErr').textContent = 'Email is required.';
      return;
    }
    if (!pwd) {
      this.$('fErr').style.color = 'var(--coral)';
      this.$('fErr').textContent = 'Password is required.';
      return;
    }

    try {
      let user;
      if (this.mode === 'register') {
        if (this.adminOnly) throw new Error('Registration is closed on /admin');
        if (pwd !== pwd2) throw new Error('Passwords do not match');
        user = await Auth.register(email, pwd, name);
        console.log('[Auth] registered:', user.email);
      } else {
        user = await Auth.login(email, pwd);
        console.log('[Auth] logged in:', user.email);
      }
      // /admin route: reject non-admin logins immediately.
      if (this.adminOnly && !user.isAdmin) {
        await Auth.logout().catch(() => {});
        throw new Error('Admin access only.');
      }
      this.$('fErr').style.color = 'var(--spring)';
      this.$('fErr').textContent = `✓ Welcome, ${user.name}!`;
      setTimeout(() => {
        this.hide();
        this.onEnter?.(false);
      }, 350);
    } catch (err) {
      console.warn('[Auth] error:', err.message);
      this.$('fErr').style.color = 'var(--coral)';
      this.$('fErr').textContent = err.message;
    }
  }

  _forgot() {
    const email = this.$('fEmail').value.trim();
    if (!email) { this.$('fErr').textContent = 'Type your email above, then click Forgot password.'; return; }
    const np = prompt(`Enter a new password (6+ chars) for ${email}:`);
    if (!np) return;
    try {
      Auth.resetPwd(email, np);
      this.$('fErr').style.color = 'var(--spring)';
      this.$('fErr').textContent = 'Password reset — login with the new one.';
    } catch (err) {
      this.$('fErr').style.color = 'var(--coral)';
      this.$('fErr').textContent = err.message;
    }
  }

  show() { this.$('authScreen').classList.remove('hidden'); this.$('appWrap').style.display = 'none'; }
  hide() { this.$('authScreen').classList.add('hidden'); this.$('appWrap').style.display = ''; }
}