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

const ROLE_LABELS = {
    ADMIN: 'Администратор',
    EDUCATION_OFFICE: 'Учебный отдел',
    DEPARTMENT: 'Кафедра',
    SCHEDULE_VIEWER: 'Просмотр расписаний',
    TEACHER: 'Преподаватель',
    STUDENT: 'Студент'
};
const ROLE_BADGE = {
    ADMIN: 'badge-admin',
    EDUCATION_OFFICE: 'badge-admin',
    DEPARTMENT: 'badge-teacher',
    SCHEDULE_VIEWER: 'badge-student',
    TEACHER: 'badge-teacher',
    STUDENT: 'badge-student'
};

export async function initUsers() {
    const usersTbody = document.getElementById('users-tbody');
    const createForm = document.getElementById('create-form');
    const teacherRequestsTbody = document.getElementById('teacher-requests-tbody');
    const teacherRequestsRefresh = document.getElementById('teacher-requests-refresh');
    let departments = [];

    async function loadUsers() {
        try {
            const users = await api.get('/api/users?includeArchived=true');
            renderUsers(users);
        } catch (e) {
            usersTbody.innerHTML =
                '<tr><td colspan="7" class="loading-row">Ошибка загрузки: ' +
                escapeHtml(e.message) + '</td></tr>';
        }
    }

    async function loadDepartments() {
        departments = await api.get('/api/departments');
    }

    async function loadTeacherRequests() {
        if (!teacherRequestsTbody) return;
        teacherRequestsTbody.innerHTML = '<tr><td colspan="7" class="loading-row">Загрузка...</td></tr>';
        hideAlert('teacher-requests-alert');
        try {
            const requests = await api.get('/api/teacher-requests?status=PENDING');
            renderTeacherRequests(Array.isArray(requests) ? requests : []);
        } catch (error) {
            teacherRequestsTbody.innerHTML = `<tr><td colspan="7" class="loading-row">${escapeHtml(error.message || 'Ошибка загрузки заявок')}</td></tr>`;
        }
    }

    function renderTeacherRequests(requests) {
        if (!requests.length) {
            teacherRequestsTbody.innerHTML = '<tr><td colspan="7" class="loading-row">Нет заявок на рассмотрении</td></tr>';
            return;
        }
        teacherRequestsTbody.innerHTML = requests.map(request => `
            <tr data-request-id="${escapeHtml(request.id)}">
                <td>
                    <select class="teacher-request-department" data-native-select="true">
                        ${departments.map(department => `
                            <option value="${escapeHtml(department.id)}" ${String(department.id) === String(request.departmentId) ? 'selected' : ''}>
                                ${escapeHtml(department.departmentName || department.name || department.id)}
                            </option>
                        `).join('')}
                    </select>
                </td>
                <td><input type="text" class="teacher-request-username" value="${escapeHtml(request.username || '')}" maxlength="50"></td>
                <td><input type="text" class="teacher-request-fullname" value="${escapeHtml(request.fullName || '')}" maxlength="255"></td>
                <td><input type="text" class="teacher-request-jobtitle" value="${escapeHtml(request.jobTitle || '')}" maxlength="255"></td>
                <td><input type="text" class="teacher-request-password" placeholder="Минимум 8 символов"></td>
                <td>${escapeHtml(request.comment || '-')}</td>
                <td>
                    <div class="teacher-request-actions">
                        <button type="button" class="btn btn-sm btn-primary teacher-request-approve">Одобрить</button>
                        <button type="button" class="btn btn-sm btn-danger-subtle teacher-request-reject">Отклонить</button>
                    </div>
                </td>
            </tr>
        `).join('');
    }

    function renderUsers(users) {
        if (!users || !users.length) {
            usersTbody.innerHTML = '<tr><td colspan="7" class="loading-row">Нет пользователей</td></tr>';
            return;
        }

        usersTbody.innerHTML = users.map(u => `
            <tr>
                <td>${u.id}</td>
                <td>${escapeHtml(u.username)}</td>
                <td>${escapeHtml(u.fullName || '-')}</td>
                <td>${escapeHtml(u.jobTitle || '-')}</td>
                <td>${escapeHtml(u.departmentName || '-')}</td>
                <td><span class="badge ${ROLE_BADGE[u.role] || ''}">${ROLE_LABELS[u.role] || escapeHtml(u.role)}</span></td>
                <td>
                    ${u.status === 'ARCHIVED'
                        ? `<button class="btn-restore-user" data-id="${u.id}">Восстановить</button>`
                        : `<button class="btn btn-sm btn-danger-subtle btn-archive-user" data-id="${u.id}">Архивировать</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;
        const fullName = document.getElementById('new-fullname').value.trim();
        const jobTitle = document.getElementById('new-jobtitle').value.trim();
        const departmentId = document.getElementById('new-department').value;

        if (!username || !password || !fullName || !jobTitle || !departmentId) {
            showAlert('create-alert', 'Заполните все поля', 'error');
            return;
        }
        if (password.length < 8) {
            showAlert('create-alert', 'Пароль должен быть не короче 8 символов', 'error');
            return;
        }

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

    teacherRequestsRefresh?.addEventListener('click', loadTeacherRequests);

    teacherRequestsTbody?.addEventListener('click', async (event) => {
        const approveButton = event.target.closest('.teacher-request-approve');
        const rejectButton = event.target.closest('.teacher-request-reject');
        if (!approveButton && !rejectButton) return;

        const row = event.target.closest('tr[data-request-id]');
        const requestId = row?.dataset.requestId;
        if (!requestId) return;

        if (approveButton) {
            const payload = {
                departmentId: Number(row.querySelector('.teacher-request-department')?.value),
                username: row.querySelector('.teacher-request-username')?.value.trim(),
                fullName: row.querySelector('.teacher-request-fullname')?.value.trim(),
                jobTitle: row.querySelector('.teacher-request-jobtitle')?.value.trim(),
                password: row.querySelector('.teacher-request-password')?.value
            };
            if (!payload.departmentId || !payload.username || !payload.fullName || !payload.password) {
                showAlert('teacher-requests-alert', 'Заполните кафедру, логин, ФИО и пароль', 'error');
                return;
            }
            if (payload.password.length < 8) {
                showAlert('teacher-requests-alert', 'Пароль должен быть не короче 8 символов', 'error');
                return;
            }
            try {
                await api.post(`/api/teacher-requests/${encodeURIComponent(requestId)}/approve`, payload);
                showAlert('teacher-requests-alert', 'Преподаватель создан, заявка одобрена', 'success');
                await Promise.all([loadTeacherRequests(), loadUsers()]);
            } catch (error) {
                showAlert('teacher-requests-alert', error.message || 'Ошибка одобрения заявки', 'error');
            }
            return;
        }

        const reviewComment = prompt('Причина отклонения');
        if (reviewComment === null) return;
        try {
            await api.post(`/api/teacher-requests/${encodeURIComponent(requestId)}/reject`, { reviewComment });
            showAlert('teacher-requests-alert', 'Заявка отклонена', 'success');
            await loadTeacherRequests();
        } catch (error) {
            showAlert('teacher-requests-alert', error.message || 'Ошибка отклонения заявки', 'error');
        }
    });

    usersTbody.addEventListener('click', async (e) => {
        const deleteBtn = e.target.closest('.btn-archive-user');
        if (!deleteBtn) return;

        if (!confirm('Архивировать пользователя? История расписания и связей сохранится.')) return;
        try {
            await api.delete('/api/users/' + deleteBtn.dataset.id);
            loadUsers();
        } catch (err) {
            alert(err.message || 'Ошибка архивирования');
        }
    });

    usersTbody.addEventListener('click', async (e) => {
        const restoreBtn = e.target.closest('.btn-restore-user');
        if (!restoreBtn) return;

        try {
            await api.post('/api/users/' + restoreBtn.dataset.id + '/restore', {});
            loadUsers();
        } catch (err) {
            alert(err.message || 'Ошибка восстановления');
        }
    });

    await loadDepartments();
    await Promise.all([loadUsers(), loadTeacherRequests()]);
}