/**
 * 메뉴 트리 공통 스크립트
 * - 부서 권한 관리 (department-permissions) - 테이블 기반
 * - 개인 권한 관리 (user-permissions) - 테이블 기반
 * - 권한 분석 (permission-analyze) - div 기반
 * - 메뉴 관리 (menus) - 테이블 기반
 *
 * localStorage 키: 'menu-tree-collapsed' (접힌 메뉴 ID 배열)
 * IIFE로 감싸서 HTMX swap 시 재실행해도 const 재선언 에러 방지
 */

(function() {
    'use strict';

    const MENU_TREE_STORAGE_KEY = 'menu-tree-collapsed';

    function getCollapsedMenuIds() {
        try {
            const data = localStorage.getItem(MENU_TREE_STORAGE_KEY);
            return data ? new Set(JSON.parse(data)) : new Set();
        } catch (e) {
            return new Set();
        }
    }

    function saveCollapsedMenuIds(collapsedSet) {
        try {
            localStorage.setItem(MENU_TREE_STORAGE_KEY, JSON.stringify([...collapsedSet]));
        } catch (e) {
            // storage full 등 무시
        }
    }

    function getChildElements(parentId) {
        let children = document.querySelectorAll(`tr.menu-row[data-parent-id="${parentId}"]`);
        if (children.length > 0) return children;
        return document.querySelectorAll(`.menu-item[data-parent-id="${parentId}"]`);
    }

    function hideChildren(parentId) {
        const children = getChildElements(parentId);
        children.forEach(child => {
            child.style.display = 'none';
            const childId = child.getAttribute('data-menu-id');
            hideChildren(childId);
        });
    }

    function showChildren(parentId) {
        const children = getChildElements(parentId);
        children.forEach(child => {
            child.style.display = '';
            const childId = child.getAttribute('data-menu-id');
            const childButton = child.querySelector(`.toggle-btn[data-menu-id="${childId}"]`);
            if (childButton) {
                const chevron = childButton.querySelector('.chevron-icon');
                if (chevron && !chevron.classList.contains('rotate-[-90deg]')) {
                    showChildren(childId);
                }
            }
        });
    }

    window.toggleChildren = function(menuId) {
        const button = document.querySelector(`.toggle-btn[data-menu-id="${menuId}"]`);
        if (!button) return;

        const chevron = button.querySelector('.chevron-icon');
        if (!chevron) return;

        const collapsedSet = getCollapsedMenuIds();
        const isCollapsed = chevron.classList.contains('rotate-[-90deg]');

        if (isCollapsed) {
            chevron.classList.remove('rotate-[-90deg]');
            showChildren(menuId);
            collapsedSet.delete(String(menuId));
        } else {
            chevron.classList.add('rotate-[-90deg]');
            hideChildren(menuId);
            collapsedSet.add(String(menuId));
        }

        saveCollapsedMenuIds(collapsedSet);
    };

    window.toggleAllChildren = function(collapse) {
        const buttons = document.querySelectorAll('.toggle-btn');
        const collapsedSet = collapse ? new Set() : new Set();

        buttons.forEach(btn => {
            const menuId = btn.getAttribute('data-menu-id');
            const chevron = btn.querySelector('.chevron-icon');
            if (!chevron) return;

            if (collapse) {
                chevron.classList.add('rotate-[-90deg]');
                hideChildren(menuId);
                collapsedSet.add(String(menuId));
            } else {
                chevron.classList.remove('rotate-[-90deg]');
                showChildren(menuId);
            }
        });

        saveCollapsedMenuIds(collapsedSet);
    };

    window.restoreMenuTreeState = function() {
        const collapsedSet = getCollapsedMenuIds();
        if (collapsedSet.size === 0) return;

        collapsedSet.forEach(menuId => {
            const button = document.querySelector(`.toggle-btn[data-menu-id="${menuId}"]`);
            if (!button) return;

            const chevron = button.querySelector('.chevron-icon');
            if (chevron) {
                chevron.classList.add('rotate-[-90deg]');
                hideChildren(menuId);
            }
        });
    };
})();