/**
 * UI - UI 操作函式
 * 包含模組切換、預覽更新、表單資料收集
 */

import { showToast } from './utils.js';
import { categoryMap, natureMap, jobCategoryMap } from './config.js';

// ==================== 模組切換 ====================

/**
 * 切換頁面模組
 * @param {string} moduleName - 模組名稱（position/job/jobdesc/positionlist/deptfunction/admin）
 */
export function switchModule(moduleName) {
    document.querySelectorAll('.module-btn').forEach(b => {
        b.classList.remove('active', 'job-active', 'desc-active');
    });
    document.querySelectorAll('.module-content').forEach(c => c.classList.remove('active'));

    const targetBtn = document.querySelector(`.module-btn[data-module="${moduleName}"]`);
    if (targetBtn) {
        targetBtn.classList.add('active');
        if (moduleName === 'job') targetBtn.classList.add('job-active');
        if (moduleName === 'jobdesc') targetBtn.classList.add('desc-active');
    }

    const targetModule = document.getElementById('module-' + moduleName);
    if (targetModule) {
        targetModule.classList.add('active');
    }

    // 自動刷新崗位清單（需要從其他模組匯入）
    if (moduleName === 'positionlist' && typeof window.loadPositionList === 'function') {
        window.loadPositionList();
    }

    updatePreview();
}

// ==================== 表單資料收集 ====================

/**
 * 收集崗位表單資料
 * @returns {Object} - 崗位資料（分為 basicInfo 和 recruitInfo）
 */
export function getPositionFormData() {
    const form = document.getElementById('positionForm');
    const formData = new FormData(form);
    const data = { basicInfo: {}, recruitInfo: {} };

    const basicFields = ['positionCode', 'positionName', 'positionCategory', 'positionCategoryName',
                        'positionNature', 'positionNatureName', 'headcount', 'positionLevel',
                        'effectiveDate', 'positionDesc', 'positionRemark'];
    const recruitFields = ['minEducation', 'requiredGender', 'salaryRange', 'workExperience',
                          'minAge', 'maxAge', 'jobType', 'recruitPosition', 'jobTitle', 'jobDesc',
                          'positionReq', 'titleReq', 'majorReq', 'skillReq', 'langReq', 'otherReq',
                          'superiorPosition', 'recruitRemark'];

    basicFields.forEach(field => {
        const value = formData.get(field);
        if (value) data.basicInfo[field] = value;
    });

    recruitFields.forEach(field => {
        const value = formData.get(field);
        if (value) data.recruitInfo[field] = value;
    });

    return data;
}

/**
 * 收集職務表單資料
 * @returns {Object} - 職務資料
 */
export function getJobFormData() {
    const form = document.getElementById('jobForm');
    const formData = new FormData(form);
    const data = {};

    const fields = ['jobCategoryCode', 'jobCategoryName', 'jobCode', 'jobName', 'jobNameEn',
                   'jobEffectiveDate', 'jobHeadcount', 'jobSortOrder', 'jobRemark', 'jobLevel'];

    fields.forEach(field => {
        const value = formData.get(field);
        if (value) data[field] = value;
    });

    data.hasAttendanceBonus = document.getElementById('hasAttendanceBonus').checked;
    data.hasHousingAllowance = document.getElementById('hasHousingAllowance').checked;

    return data;
}

/**
 * 收集崗位描述表單資料
 * @returns {Object} - 崗位描述資料
 */
export function getJobDescFormData() {
    const form = document.getElementById('jobDescForm');
    if (!form) return {};

    const formData = new FormData(form);
    const data = { basicInfo: {}, positionInfo: {}, responsibilities: {}, requirements: {} };

    // Basic Info
    ['empNo', 'empName', 'positionCode', 'versionDate'].forEach(field => {
        const el = document.getElementById('jd_' + field);
        if (el && el.value) data.basicInfo[field] = el.value;
    });

    // Position Info
    ['positionName', 'department', 'positionEffectiveDate', 'directSupervisor',
     'positionGradeJob', 'reportTo', 'directReports', 'workLocation', 'empAttribute'].forEach(field => {
        const el = document.getElementById('jd_' + field);
        if (el && el.value) data.positionInfo[field] = el.value;
    });

    // Purpose & Responsibilities
    const purpose = document.getElementById('jd_positionPurpose');
    if (purpose && purpose.value) data.responsibilities.positionPurpose = purpose.value;

    const mainResp = document.getElementById('jd_mainResponsibilities');
    if (mainResp && mainResp.value) data.responsibilities.mainResponsibilities = mainResp.value;

    // Requirements
    ['education', 'basicSkills', 'professionalKnowledge', 'workExperienceReq', 'otherRequirements'].forEach(field => {
        const el = document.getElementById('jd_' + field);
        if (el && el.value) data.requirements[field] = el.value;
    });

    return data;
}

/**
 * 收集部門職責表單資料
 * @returns {Object} - 部門職責資料
 */
export function getDeptFunctionFormData() {
    const form = document.getElementById('deptFunctionForm');
    if (!form) return {};

    const formData = new FormData(form);
    const data = {};

    const fields = ['deptFunctionCode', 'deptFunctionName', 'deptFunctionBU',
                   'deptFunctionDept', 'deptManager', 'deptMission', 'deptVision',
                   'deptCoreFunctions', 'deptKPIs'];

    fields.forEach(field => {
        const value = formData.get(field);
        if (value) data[field] = value;
    });

    return data;
}

// ==================== 預覽更新 ====================

/**
 * 更新 JSON 預覽
 */
export function updatePreview() {
    const activeBtn = document.querySelector('.module-btn.active');
    if (!activeBtn) return;

    const activeModule = activeBtn.dataset.module;
    let data;

    if (activeModule === 'position') {
        data = { module: '崗位基礎資料', ...getPositionFormData() };
    } else if (activeModule === 'job') {
        data = { module: '職務基礎資料', ...getJobFormData() };
    } else if (activeModule === 'jobdesc') {
        data = { module: '崗位描述', ...getJobDescFormData() };
    } else if (activeModule === 'deptfunction') {
        data = { module: '部門職責', ...getDeptFunctionFormData() };
    } else {
        return; // 其他模組不顯示預覽
    }

    const previewEl = document.getElementById('jsonPreview');
    if (previewEl) {
        previewEl.textContent = JSON.stringify(data, null, 2);
    }
}

// ==================== 表單邏輯輔助函式 ====================

/**
 * 更新崗位類別中文名稱
 */
export function updateCategoryName() {
    const category = document.getElementById('positionCategory').value;
    document.getElementById('positionCategoryName').value = categoryMap[category] || '';
    updatePreview();
}

/**
 * 更新崗位性質中文名稱
 */
export function updateNatureName() {
    const nature = document.getElementById('positionNature').value;
    document.getElementById('positionNatureName').value = natureMap[nature] || '';
    updatePreview();
}

/**
 * 更新職務類別中文名稱
 */
export function updateJobCategoryName() {
    const category = document.getElementById('jobCategoryCode').value;
    document.getElementById('jobCategoryName').value = jobCategoryMap[category] || '';
    updatePreview();
}

/**
 * 修改崗位編號
 */
export function changePositionCode() {
    const currentCode = document.getElementById('positionCode').value;
    const newCode = prompt('請輸入新的崗位編號:', currentCode);
    if (newCode && newCode !== currentCode) {
        document.getElementById('positionCode').value = newCode;
        showToast('崗位編號已更改！');
        updatePreview();
    }
}

/**
 * 修改職務編號
 */
export function changeJobCode() {
    const currentCode = document.getElementById('jobCode').value;
    const newCode = prompt('請輸入新的職務編號:', currentCode);
    if (newCode && newCode !== currentCode) {
        document.getElementById('jobCode').value = newCode;
        showToast('職務編號已更改！');
        updatePreview();
    }
}

// ==================== 模態框函式（待整合）====================

/**
 * 開啟專業科目選擇模態框
 */
export function openMajorModal() {
    const modal = document.getElementById('majorModal');
    if (modal) {
        modal.classList.add('show');
    }
}

/**
 * 關閉專業科目選擇模態框
 */
export function closeMajorModal() {
    const modal = document.getElementById('majorModal');
    if (modal) {
        modal.classList.remove('show');
    }
}

/**
 * 確認選擇專業科目
 */
export function confirmMajor() {
    const selected = [];
    document.querySelectorAll('#majorModal input[type="checkbox"]:checked').forEach(cb => {
        selected.push(cb.value);
    });
    document.getElementById('majorReq').value = selected.join(', ');
    closeMajorModal();
    updatePreview();
}

// 將函式掛載到 window 上以便內聯事件處理器使用
if (typeof window !== 'undefined') {
    window.switchModule = switchModule;
    window.updateCategoryName = updateCategoryName;
    window.updateNatureName = updateNatureName;
    window.updateJobCategoryName = updateJobCategoryName;
    window.changePositionCode = changePositionCode;
    window.changeJobCode = changeJobCode;
    window.openMajorModal = openMajorModal;
    window.closeMajorModal = closeMajorModal;
    window.confirmMajor = confirmMajor;
    window.updatePreview = updatePreview;
}