import { api } from '../api.js';
import { escapeHtml, showAlert, hideAlert } from '../utils.js';
import { confirmAction } from '../dialog.js';
import { renderPagination } from '../pagination.js';
import { debounce, readUrlState, writeUrlState } from '../url-state.js';
import { markTableReady, renderTableEmpty, renderTableError, renderTableLoading } from '../view-state.js';
import { trackUxEvent } from '../../../telemetry.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 searchInput = document.getElementById('users-search');
    const roleFilter = document.getElementById('users-role-filter');
    const sortSelect = document.getElementById('users-sort');
    const pagination = document.getElementById('users-pagination');
    const restored = readUrlState({ userQuery: '', userRole: '', userPage: '0', userSize: '25', userSort: 'fullName,asc' });
    const state = {
        query: restored.userQuery,
        role: restored.userRole,
        page: Math.max(Number(restored.userPage) || 0, 0),
        size: [25, 50, 100].includes(Number(restored.userSize)) ? Number(restored.userSize) : 25,
        sort: restored.userSort
    };
    searchInput.value = state.query;
    roleFilter.value = state.role;
    sortSelect.value = state.sort;

    async function loadUsers() {
        renderTableLoading(usersTbody, 7, 'Загрузка пользователей...');
        hideAlert('users-alert');
        try {
            const [sort, direction] = state.sort.split(',');
            const params = new URLSearchParams({
                query: state.query,
                page: String(state.page),
                size: String(state.size),
                sort,
                direction,
                includeArchived: 'true'
            });
            if (state.role) params.set('role', state.role);
            const result = await api.get(`/api/users/page?${params}`);
            renderUsers(result.items || []);
            renderPagination(pagination, result, {
                label: 'пользователей',
                onPage: page => { state.page = page; loadUsers(); },
                onSize: size => { state.size = size; state.page = 0; loadUsers(); }
            });
            persistState();
            trackUxEvent('реестр_пользователей_загружен', { total: Number(result.totalItems || 0), page: state.page });
        } catch (e) {
            renderTableError(usersTbody, 7, e.message || 'Не удалось загрузить пользователей', loadUsers);
        }
    }

    function renderUsers(users) {
        if (!users || !users.length) {
            renderTableEmpty(usersTbody, 7, state.query || state.role ? 'Пользователи не найдены' : 'Пользователей пока нет');
            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>
                    ${u.status === 'ARCHIVED'
                        ? `<button class="btn btn-sm btn-secondary btn-restore-user" data-id="${u.id}">Восстановить</button>`
                        : `<button class="btn btn-sm btn-danger-subtle btn-archive-user" data-id="${u.id}">Архивировать</button>`}
                </td>
            </tr>
        `).join('');
        markTableReady(usersTbody);
    }

    searchInput.addEventListener('input', debounce(() => {
        state.query = searchInput.value.trim();
        state.page = 0;
        loadUsers();
    }));
    roleFilter.addEventListener('change', () => {
        state.role = roleFilter.value;
        state.page = 0;
        loadUsers();
    });
    sortSelect.addEventListener('change', () => {
        state.sort = sortSelect.value;
        state.page = 0;
        loadUsers();
    });

    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');
        }
    });

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

        if (!await confirmAction({
            title: 'Архивировать пользователя?',
            message: 'Доступ будет отключён, а история расписания и связей сохранится.',
            confirmLabel: 'Архивировать',
            danger: true
        })) return;
        try {
            await api.delete('/api/users/' + deleteBtn.dataset.id);
            loadUsers();
        } catch (err) {
            showAlert('users-alert', err.message || 'Ошибка архивирования', 'error');
        }
    });

    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) {
            showAlert('users-alert', err.message || 'Ошибка восстановления', 'error');
        }
    });

    function persistState() {
        writeUrlState({
            userQuery: state.query,
            userRole: state.role,
            userPage: state.page || '',
            userSize: state.size === 25 ? '' : state.size,
            userSort: state.sort === 'fullName,asc' ? '' : state.sort
        });
    }

    await loadUsers();
}