import { api } from '../api.js';
import { escapeHtml, showAlert, hideAlert } from '../utils.js';

const ROLE_LABELS = { ADMIN: 'Администратор', TEACHER: 'Преподаватель', STUDENT: 'Студент' };
const ROLE_BADGE = { ADMIN: 'badge-admin', TEACHER: 'badge-teacher', STUDENT: 'badge-student' };

export async function initUsers() {
    const usersTbody = document.getElementById('users-tbody');
    const createForm = document.getElementById('create-form');
    const createAlert = document.getElementById('create-alert');

    async function loadUsers() {
        try {
            const users = await api.get('/api/users');
            renderUsers(users);
        } catch (e) {
            usersTbody.innerHTML = '<tr><td colspan="4" class="loading-row">Ошибка загрузки: ' + escapeHtml(e.message) + '</td></tr>';
        }
    }

    function renderUsers(users) {
        if (!users || !users.length) {
            usersTbody.innerHTML = '<tr><td colspan="4" class="loading-row">Нет пользователей</td></tr>';
            return;
        }
        usersTbody.innerHTML = users.map(u => `
      <tr>
        <td>${u.id}</td>
        <td>${escapeHtml(u.username)}</td>
        <td><span class="badge ${ROLE_BADGE[u.role] || ''}">${ROLE_LABELS[u.role] || escapeHtml(u.role)}</span></td>
        <td><button class="btn-delete" data-id="${u.id}">Удалить</button></td>
      </tr>`).join('');
    }

    createForm.addEventListener('submit', async (e) => {
        e.preventDefault();
        hideAlert('create-alert');
        const username = document.getElementById('new-username').value.trim();
        const password = document.getElementById('new-password').value;
        const role = document.getElementById('new-role').value;
        if (!username || !password) { showAlert('create-alert', 'Заполните все поля', 'error'); return; }

        try {
            const data = await api.post('/api/users', { username, password, role });
            showAlert('create-alert', `Пользователь "${escapeHtml(data.username)}" создан`, 'success');
            createForm.reset();
            loadUsers();
        } catch (e) {
            showAlert('create-alert', e.message || 'Ошибка соединения', 'error');
        }
    });

    usersTbody.addEventListener('click', async (e) => {
        const btn = e.target.closest('.btn-delete');
        if (!btn) return;
        if (!confirm('Удалить пользователя?')) return;
        try {
            await api.delete('/api/users/' + btn.dataset.id);
            loadUsers();
        } catch (e) {
            alert(e.message || 'Ошибка удаления');
        }
    });

    // Initial load
    loadUsers();
}