/**
 * Main - 主程式
 * 初始化應用程式，設定事件監聽器
 */

import { showToast } from './utils.js';
import { switchModule, updatePreview, updateCategoryName, updateNatureName, updateJobCategoryName } from './ui.js';
import { initializeBagTitles } from './ai-bags.js';

// ==================== 初始化 ====================

/**
 * 載入用戶信息
 */
function loadUserInfo() {
    const currentUser = localStorage.getItem('currentUser');
    if (!currentUser) {
        return;
    }

    try {
        const userData = JSON.parse(currentUser);
        const userName = document.getElementById('userName');
        const userRole = document.getElementById('userRole');
        const userAvatar = document.getElementById('userAvatar');

        if (userName) userName.textContent = userData.name || '使用者';
        if (userRole) userRole.textContent = userData.role || '一般使用者';
        if (userAvatar) userAvatar.textContent = (userData.name || 'U').charAt(0).toUpperCase();
    } catch (e) {
        console.error('解析用戶資料失敗:', e);
    }
}

/**
 * 登出功能
 */
function logout() {
    if (confirm('確定要登出嗎？')) {
        localStorage.removeItem('currentUser');
        window.location.href = 'login.html';
    }
}

// ==================== 事件監聽器設置 ====================

/**
 * 設置模組切換事件
 */
function setupModuleSwitching() {
    document.querySelectorAll('.module-btn').forEach(btn => {
        btn.addEventListener('click', () => {
            const moduleName = btn.dataset.module;
            if (moduleName) {
                switchModule(moduleName);
            }
        });
    });
}

/**
 * 設置標籤頁切換事件
 */
function setupTabSwitching() {
    document.querySelectorAll('.tab-btn').forEach(btn => {
        btn.addEventListener('click', () => {
            const parent = btn.closest('.form-card');
            if (!parent) return;

            parent.querySelectorAll('.tab-btn').forEach(b => b.classList.remove('active'));
            parent.querySelectorAll('.tab-content').forEach(c => c.classList.remove('active'));

            btn.classList.add('active');
            const targetTab = document.getElementById('tab-' + btn.dataset.tab);
            if (targetTab) {
                targetTab.classList.add('active');
            }
        });
    });
}

/**
 * 設置表單欄位監聽
 */
function setupFormListeners() {
    // 監聽所有表單欄位變更，更新預覽
    document.querySelectorAll('input, select, textarea').forEach(field => {
        field.addEventListener('change', updatePreview);
        field.addEventListener('input', updatePreview);
    });

    // 崗位類別變更
    const positionCategory = document.getElementById('positionCategory');
    if (positionCategory) {
        positionCategory.addEventListener('change', updateCategoryName);
    }

    // 崗位性質變更
    const positionNature = document.getElementById('positionNature');
    if (positionNature) {
        positionNature.addEventListener('change', updateNatureName);
    }

    // 職務類別變更
    const jobCategoryCode = document.getElementById('jobCategoryCode');
    if (jobCategoryCode) {
        jobCategoryCode.addEventListener('change', updateJobCategoryName);
    }

    // Toggle 開關變更
    const hasAttendanceBonus = document.getElementById('hasAttendanceBonus');
    if (hasAttendanceBonus) {
        hasAttendanceBonus.addEventListener('change', function() {
            const label = document.getElementById('attendanceLabel');
            if (label) {
                label.textContent = this.checked ? '是' : '否';
            }
            updatePreview();
        });
    }

    const hasHousingAllowance = document.getElementById('hasHousingAllowance');
    if (hasHousingAllowance) {
        hasHousingAllowance.addEventListener('change', function() {
            const label = document.getElementById('housingLabel');
            if (label) {
                label.textContent = this.checked ? '是' : '否';
            }
            updatePreview();
        });
    }
}

/**
 * 設置快捷鍵
 */
function setupKeyboardShortcuts() {
    document.addEventListener('keydown', (e) => {
        // Ctrl+S 或 Cmd+S: 保存當前模組
        if ((e.ctrlKey || e.metaKey) && e.key === 's') {
            e.preventDefault();
            const activeModule = document.querySelector('.module-btn.active');
            if (!activeModule) return;

            const moduleName = activeModule.dataset.module;
            if (moduleName === 'position' && typeof window.savePositionAndExit === 'function') {
                window.savePositionAndExit();
            } else if (moduleName === 'job' && typeof window.saveJobAndExit === 'function') {
                window.saveJobAndExit();
            } else if (moduleName === 'jobdesc' && typeof window.saveJobDescAndExit === 'function') {
                window.saveJobDescAndExit();
            } else if (moduleName === 'deptfunction' && typeof window.saveDeptFunctionAndExit === 'function') {
                window.saveDeptFunctionAndExit();
            }
        }

        // Ctrl+N 或 Cmd+N: 保存並新增下一筆
        if ((e.ctrlKey || e.metaKey) && e.key === 'n') {
            e.preventDefault();
            const activeModule = document.querySelector('.module-btn.active');
            if (!activeModule) return;

            const moduleName = activeModule.dataset.module;
            if (moduleName === 'position' && typeof window.savePositionAndNew === 'function') {
                window.savePositionAndNew();
            } else if (moduleName === 'job' && typeof window.saveJobAndNew === 'function') {
                window.saveJobAndNew();
            } else if (moduleName === 'jobdesc' && typeof window.saveJobDescAndNew === 'function') {
                window.saveJobDescAndNew();
            } else if (moduleName === 'deptfunction' && typeof window.saveDeptFunctionAndNew === 'function') {
                window.saveDeptFunctionAndNew();
            }
        }
    });
}

// ==================== DOMContentLoaded 初始化 ====================

document.addEventListener('DOMContentLoaded', () => {
    console.log('🚀 HR 系統初始化中...');

    // 載入用戶信息
    loadUserInfo();

    // 設置事件監聽器
    setupModuleSwitching();
    setupTabSwitching();
    setupFormListeners();
    setupKeyboardShortcuts();

    // 初始化 AI 錦囊標題
    initializeBagTitles();

    // 初始化預覽
    updatePreview();

    console.log('✅ HR 系統初始化完成');
});

// ==================== 將函式掛載到 window ====================

if (typeof window !== 'undefined') {
    window.logout = logout;
    window.loadUserInfo = loadUserInfo;
}