/**
 * 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: {} };

    // 使用新的 pos_ prefix 欄位
    const basicFieldMapping = {
        'pos_code': 'positionCode',
        'pos_name': 'positionName',
        'pos_category': 'positionCategory',
        'pos_categoryName': 'positionCategoryName',
        'pos_type': 'positionType',
        'pos_typeName': 'positionTypeName',
        'pos_headcount': 'headcount',
        'pos_level': 'positionLevel',
        'pos_effectiveDate': 'effectiveDate',
        'pos_desc': 'positionDesc',
        'pos_remark': 'positionRemark'
    };

    // 使用新的 rec_ prefix 欄位
    const recruitFieldMapping = {
        'rec_eduLevel': 'minEducation',
        'rec_gender': 'requiredGender',
        'rec_salaryRange': 'salaryRange',
        'rec_expYears': 'workExperience',
        'rec_minAge': 'minAge',
        'rec_maxAge': 'maxAge',
        'rec_jobType': 'jobType',
        'rec_position': 'recruitPosition',
        'rec_jobTitle': 'jobTitle',
        'rec_jobDesc': 'jobDesc',
        'rec_positionReq': 'positionReq',
        'rec_certReq': 'certReq',
        'rec_majorReq': 'majorReq',
        'rec_skillReq': 'skillReq',
        'rec_langReq': 'langReq',
        'rec_otherReq': 'otherReq',
        'rec_superiorCode': 'superiorPosition',
        'rec_remark': 'recruitRemark'
    };

    Object.entries(basicFieldMapping).forEach(([htmlId, dataKey]) => {
        const el = document.getElementById(htmlId);
        if (el && el.value) data.basicInfo[dataKey] = el.value;
    });

    Object.entries(recruitFieldMapping).forEach(([htmlId, dataKey]) => {
        const el = document.getElementById(htmlId);
        if (el && el.value) data.recruitInfo[dataKey] = el.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 data = {};

    // 使用新的 job_ prefix 欄位
    const fieldMapping = {
        'job_category': 'jobCategoryCode',
        'job_categoryName': 'jobCategoryName',
        'job_code': 'jobCode',
        'job_name': 'jobName',
        'job_nameEn': 'jobNameEn',
        'job_level': 'jobLevel',
        'job_effectiveDate': 'jobEffectiveDate',
        'job_sortOrder': 'jobSortOrder',
        'job_headcount': 'jobHeadcount',
        'job_remark': 'jobRemark'
    };

    Object.entries(fieldMapping).forEach(([htmlId, dataKey]) => {
        const el = document.getElementById(htmlId);
        if (el && el.value) data[dataKey] = el.value;
    });

    const hasAttBonus = document.getElementById('job_hasAttBonus');
    const hasHouseAllow = document.getElementById('job_hasHouseAllow');
    data.hasAttendanceBonus = hasAttBonus ? hasAttBonus.checked : false;
    data.hasHousingAllowance = hasHouseAllow ? hasHouseAllow.checked : false;

    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 data = { basicInfo: {}, positionInfo: {}, responsibilities: {}, requirements: {} };

    // Basic Info - 使用新的 jd_ prefix
    const basicMapping = {
        'jd_empNo': 'empNo',
        'jd_empName': 'empName',
        'jd_posCode': 'positionCode',
        'jd_versionDate': 'versionDate'
    };

    Object.entries(basicMapping).forEach(([htmlId, dataKey]) => {
        const el = document.getElementById(htmlId);
        if (el && el.value) data.basicInfo[dataKey] = el.value;
    });

    // Position Info - 使用新的 jd_ prefix
    const posInfoMapping = {
        'jd_posName': 'positionName',
        'jd_department': 'department',
        'jd_posLevel': 'positionLevel',
        'jd_posEffDate': 'positionEffectiveDate',
        'jd_supervisor': 'directSupervisor',
        'jd_gradeJob': 'positionGradeJob',
        'jd_reportTo': 'reportTo',
        'jd_directReports': 'directReports',
        'jd_location': 'workLocation',
        'jd_empAttr': 'empAttribute'
    };

    Object.entries(posInfoMapping).forEach(([htmlId, dataKey]) => {
        const el = document.getElementById(htmlId);
        if (el && el.value) data.positionInfo[dataKey] = el.value;
    });

    // Purpose & Responsibilities - 使用新的 jd_ prefix
    const purpose = document.getElementById('jd_purpose');
    if (purpose && purpose.value) data.responsibilities.positionPurpose = purpose.value;

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

    // Requirements - 使用新的 jd_ prefix
    const reqMapping = {
        'jd_eduLevel': 'education',
        'jd_basicSkills': 'basicSkills',
        'jd_proKnowledge': 'professionalKnowledge',
        'jd_expReq': 'workExperienceReq',
        'jd_otherReq': 'otherRequirements'
    };

    Object.entries(reqMapping).forEach(([htmlId, dataKey]) => {
        const el = document.getElementById(htmlId);
        if (el && el.value) data.requirements[dataKey] = 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 data = {};

    // 使用新的 df_ prefix 欄位
    const fieldMapping = {
        'df_code': 'dfCode',
        'df_name': 'dfName',
        'df_businessUnit': 'businessUnit',
        'df_division': 'division',
        'df_department': 'department',
        'df_section': 'section',
        'df_posTitle': 'positionTitle',
        'df_posLevel': 'positionLevel',
        'df_managerTitle': 'managerTitle',
        'df_effectiveDate': 'effectiveDate',
        'df_headcountLimit': 'headcountLimit',
        'df_status': 'status',
        'df_mission': 'mission',
        'df_vision': 'vision',
        'df_coreFunc': 'coreFunctions',
        'df_kpis': 'kpis',
        'df_collab': 'collaboration',
        'df_remark': 'remark'
    };

    Object.entries(fieldMapping).forEach(([htmlId, dataKey]) => {
        const el = document.getElementById(htmlId);
        if (el && el.value) data[dataKey] = el.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 categoryEl = document.getElementById('pos_category');
    const categoryNameEl = document.getElementById('pos_categoryName');
    if (categoryEl && categoryNameEl) {
        categoryNameEl.value = categoryMap[categoryEl.value] || '';
    }
    updatePreview();
}

/**
 * 更新崗位性質中文名稱
 */
export function updateNatureName() {
    const typeEl = document.getElementById('pos_type');
    const typeNameEl = document.getElementById('pos_typeName');
    if (typeEl && typeNameEl) {
        typeNameEl.value = natureMap[typeEl.value] || '';
    }
    updatePreview();
}

/**
 * 更新職務類別中文名稱
 */
export function updateJobCategoryName() {
    const categoryEl = document.getElementById('job_category');
    const categoryNameEl = document.getElementById('job_categoryName');
    if (categoryEl && categoryNameEl) {
        categoryNameEl.value = jobCategoryMap[categoryEl.value] || '';
    }
    updatePreview();
}

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

/**
 * 修改職務編號
 */
export function changeJobCode() {
    const codeEl = document.getElementById('job_code');
    if (!codeEl) return;
    const currentCode = codeEl.value;
    const newCode = prompt('請輸入新的職務編號:', currentCode);
    if (newCode && newCode !== currentCode) {
        codeEl.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);
    });
    const majorReqEl = document.getElementById('rec_majorReq');
    if (majorReqEl) {
        majorReqEl.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;
}