import { apiClient } from '../shared/api-client.js';

export const USER_TABLE_COLUMNS = 7;
export const USER_PAGE_SIZES = [25, 50, 100];

export const USER_SORT_OPTIONS = Object.freeze([
    { value: 'fullName,asc', label: 'По ФИО А–Я' },
    { value: 'fullName,desc', label: 'По ФИО Я–А' },
    { value: 'username,asc', label: 'По логину' },
    { value: 'role,asc', label: 'По роли' },
    { value: 'status,asc', label: 'По статусу' }
]);

export const ROLE_LABELS = Object.freeze({
    ADMIN: 'Администратор',
    EDUCATION_OFFICE: 'Учебный отдел',
    DEPARTMENT: 'Кафедра',
    SCHEDULE_VIEWER: 'Просмотр расписаний',
    TEACHER: 'Преподаватель',
    STUDENT: 'Студент'
});

export const ROLE_BADGE = Object.freeze({
    ADMIN: 'badge-admin',
    EDUCATION_OFFICE: 'badge-admin',
    DEPARTMENT: 'badge-teacher',
    SCHEDULE_VIEWER: 'badge-student',
    TEACHER: 'badge-teacher',
    STUDENT: 'badge-student'
});

export const ROLE_FILTER_OPTIONS = Object.freeze([
    { value: 'ADMIN', label: 'Администратор' },
    { value: 'EDUCATION_OFFICE', label: 'Учебный отдел' },
    { value: 'DEPARTMENT', label: 'Кафедра' },
    { value: 'SCHEDULE_VIEWER', label: 'Просмотр расписаний' },
    { value: 'TEACHER', label: 'Преподаватель' },
    { value: 'STUDENT', label: 'Студент' }
]);

export function normalizeUsersState(restored = {}) {
    const size = Number(restored.userSize);
    return {
        query: restored.userQuery || '',
        role: restored.userRole || '',
        page: Math.max(Number(restored.userPage) || 0, 0),
        size: USER_PAGE_SIZES.includes(size) ? size : 25,
        sort: USER_SORT_OPTIONS.some(option => option.value === restored.userSort)
            ? restored.userSort
            : 'fullName,asc'
    };
}

export function initialUsersState(restored = {}) {
    return normalizeUsersState(restored);
}

export function usersQueryParams(state) {
    const [sort, direction] = String(state.sort || 'fullName,asc').split(',');
    const params = new URLSearchParams({
        query: state.query || '',
        page: String(state.page || 0),
        size: String(state.size || 25),
        sort,
        direction,
        includeArchived: 'true'
    });
    if (state.role) params.set('role', state.role);
    return `/api/users/page?${params}`;
}

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

export function fetchUsersPage(state, client = apiClient) {
    return client.get(usersQueryParams(state), { errorMessage: 'Не удалось загрузить пользователей' });
}

export function createUser({ username, password, role, fullName, jobTitle, departmentId }, client = apiClient) {
    return client.post(
        '/api/users',
        { username, password, role, fullName, jobTitle, departmentId: Number(departmentId) },
        { errorMessage: 'Ошибка соединения' }
    );
}

export function archiveUser(id, client = apiClient) {
    return client.delete(`/api/users/${id}`, { errorMessage: 'Ошибка архивирования' });
}

export function restoreUser(id, client = apiClient) {
    return client.post(`/api/users/${id}/restore`, {}, { errorMessage: 'Ошибка восстановления' });
}

export function roleLabel(role) {
    return ROLE_LABELS[role] || role;
}

export function roleBadgeClass(role) {
    return ROLE_BADGE[role] || '';
}

export function usersEmptyMessage(state) {
    return state.query || state.role ? 'Пользователи не найдены' : 'Пользователей пока нет';
}