/**
 * 表單邏輯模組
 * 處理各表單的資料操作、驗證和提交
 */

const API_BASE_URL = '/api';

// ==================== 常數映射 ====================

export const categoryMap = { '01': '技術職', '02': '管理職', '03': '業務職', '04': '行政職' };
export const natureMap = { 'FT': '全職', 'PT': '兼職', 'CT': '約聘', 'IN': '實習' };
export const jobCategoryMap = { 'MGR': '管理職', 'TECH': '技術職', 'SALE': '業務職', 'ADMIN': '行政職', 'RD': '研發職', 'PROD': '生產職' };

// ==================== 崗位清單全域變數 ====================
export let positionListData = [];
export let currentSortColumn = '';
export let currentSortDirection = 'asc';

// ==================== 崗位基礎資料表單 ====================

export function updateCategoryName() {
    const category = document.getElementById('positionCategory').value;
    document.getElementById('positionCategoryName').value = categoryMap[category] || '';
    updatePreview();
}

export function updateNatureName() {
    const nature = document.getElementById('positionNature').value;
    document.getElementById('positionNatureName').value = natureMap[nature] || '';
    updatePreview();
}

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();
    }
}

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;
}

export function savePositionAndExit() {
    const form = document.getElementById('positionForm');
    if (!form.checkValidity()) { form.reportValidity(); return; }
    console.log('Save Position:', getPositionFormData());
    showToast('崗位資料已保存！');
}

export function savePositionAndNew() {
    const form = document.getElementById('positionForm');
    if (!form.checkValidity()) { form.reportValidity(); return; }
    console.log('Save Position:', getPositionFormData());
    showToast('崗位資料已保存，請繼續新增！');
    form.reset();
    document.getElementById('effectiveDate').value = new Date().toISOString().split('T')[0];
    updatePreview();
}

export async function saveToPositionList() {
    const form = document.getElementById('positionForm');
    if (!form.checkValidity()) {
        form.reportValidity();
        return;
    }

    const formData = getPositionFormData();

    if (!formData.basicInfo.positionCode) {
        alert('請輸入崗位編號');
        return;
    }
    if (!formData.basicInfo.positionName) {
        alert('請輸入崗位名稱');
        return;
    }

    try {
        const response = await fetch(API_BASE_URL + '/positions', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify(formData)
        });

        const result = await response.json();

        if (result.success) {
            showToast(result.message || '崗位已成功儲存至崗位清單！');
            setTimeout(() => {
                switchModule('positionlist');
            }, 1500);
        } else {
            alert('儲存失敗: ' + (result.error || '未知錯誤'));
        }
    } catch (error) {
        console.error('儲存錯誤:', error);
        alert('儲存失敗: ' + error.message);
    }
}

export function cancelPositionForm() {
    if (confirm('確定要取消嗎？未保存的資料將會遺失。')) {
        document.getElementById('positionForm').reset();
        updatePreview();
    }
}

// ==================== 職務基礎資料表單 ====================

export function updateJobCategoryName() {
    const category = document.getElementById('jobCategoryCode').value;
    document.getElementById('jobCategoryName').value = jobCategoryMap[category] || '';
    updatePreview();
}

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();
    }
}

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('job_hasAttBonus')?.checked || false;
    data.hasHousingAllowance = document.getElementById('job_hasHouseAllow')?.checked || false;
    return data;
}

export async function saveJobToPositionList() {
    const form = document.getElementById('jobForm');
    if (!form.checkValidity()) {
        form.reportValidity();
        return;
    }

    const formData = getJobFormData();

    if (!formData.jobCode) {
        alert('請輸入職務代碼');
        return;
    }
    if (!formData.jobName) {
        alert('請輸入職務名稱');
        return;
    }

    const positionData = {
        basicInfo: {
            positionCode: formData.jobCode,
            positionName: formData.jobName,
            positionCategory: formData.jobCategoryCode || '',
            effectiveDate: formData.jobEffectiveDate || new Date().toISOString().split('T')[0],
            headcount: formData.jobHeadcount || 1,
            positionLevel: formData.jobLevel || '',
            positionRemark: formData.jobRemark || ''
        },
        recruitInfo: {}
    };

    try {
        const response = await fetch(API_BASE_URL + '/positions', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify(positionData)
        });

        const result = await response.json();

        if (result.success) {
            showToast(result.message || '職務已成功儲存至崗位清單！');
            setTimeout(() => {
                switchModule('positionlist');
            }, 1500);
        } else {
            alert('儲存失敗: ' + (result.error || '未知錯誤'));
        }
    } catch (error) {
        console.error('儲存錯誤:', error);
        alert('儲存失敗: ' + error.message);
    }
}

export function saveJobAndExit() {
    const form = document.getElementById('jobForm');
    if (!form.checkValidity()) { form.reportValidity(); return; }
    console.log('Save Job:', getJobFormData());
    showToast('職務資料已保存！');
}

export function saveJobAndNew() {
    const form = document.getElementById('jobForm');
    if (!form.checkValidity()) { form.reportValidity(); return; }
    console.log('Save Job:', getJobFormData());
    showToast('職務資料已保存，請繼續新增！');
    form.reset();
    document.getElementById('attendanceLabel').textContent = '否';
    document.getElementById('housingLabel').textContent = '否';
    updatePreview();
}

export function cancelJobForm() {
    if (confirm('確定要取消嗎？未保存的資料將會遺失。')) {
        document.getElementById('jobForm').reset();
        document.getElementById('attendanceLabel').textContent = '否';
        document.getElementById('housingLabel').textContent = '否';
        updatePreview();
    }
}

// ==================== 崗位描述表單 ====================

export function getJobDescFormData() {
    const form = document.getElementById('jobDescForm');
    const formData = new FormData(form);
    const data = { basicInfo: {}, positionInfo: {}, responsibilities: {}, requirements: {} };

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

    ['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;
    });

    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;

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

    return data;
}

export async function saveJobDescAndExit() {
    const formData = getJobDescFormData();
    console.log('Save JobDesc:', formData);

    if (!formData.basicInfo.positionCode) {
        alert('請輸入崗位代碼');
        return;
    }

    const requestData = {
        positionCode: formData.basicInfo.positionCode,
        positionName: formData.positionInfo.positionName || '',
        effectiveDate: formData.positionInfo.positionEffectiveDate || new Date().toISOString().split('T')[0],
        jobDuties: formData.responsibilities.mainResponsibilities || '',
        requiredSkills: formData.requirements.basicSkills || '',
        workEnvironment: formData.positionInfo.workLocation || ''
    };

    try {
        const response = await fetch(API_BASE_URL + '/position-descriptions', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify(requestData)
        });

        const result = await response.json();

        if (result.success) {
            showToast(result.message || '崗位描述已保存！');
            setTimeout(() => {
                switchModule('positionlist');
            }, 1000);
        } else {
            alert('保存失敗: ' + (result.error || '未知錯誤'));
        }
    } catch (error) {
        console.error('保存錯誤:', error);
        alert('保存失敗: ' + error.message);
    }
}

export async function saveJobDescAndNew() {
    const formData = getJobDescFormData();
    console.log('Save JobDesc:', formData);

    if (!formData.basicInfo.positionCode) {
        alert('請輸入崗位代碼');
        return;
    }

    const requestData = {
        positionCode: formData.basicInfo.positionCode,
        positionName: formData.positionInfo.positionName || '',
        effectiveDate: formData.positionInfo.positionEffectiveDate || new Date().toISOString().split('T')[0],
        jobDuties: formData.responsibilities.mainResponsibilities || '',
        requiredSkills: formData.requirements.basicSkills || '',
        workEnvironment: formData.positionInfo.workLocation || ''
    };

    try {
        const response = await fetch(API_BASE_URL + '/position-descriptions', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify(requestData)
        });

        const result = await response.json();

        if (result.success) {
            showToast(result.message || '崗位描述已保存，請繼續新增！');
            document.getElementById('jobDescForm').reset();
            document.getElementById('jd_mainResponsibilities').value = '1、\n2、\n3、\n4、';
            updatePreview();
        } else {
            alert('保存失敗: ' + (result.error || '未知錯誤'));
        }
    } catch (error) {
        console.error('保存錯誤:', error);
        alert('保存失敗: ' + error.message);
    }
}

export async function saveJobDescToPositionList() {
    const formData = getJobDescFormData();

    if (!formData.basicInfo.positionCode) {
        alert('請輸入崗位代碼');
        return;
    }

    const positionData = {
        basicInfo: {
            positionCode: formData.basicInfo.positionCode,
            positionName: formData.positionInfo.positionName || '',
            effectiveDate: formData.positionInfo.positionEffectiveDate || new Date().toISOString().split('T')[0],
            positionDesc: formData.responsibilities.mainResponsibilities || '',
            positionRemark: formData.responsibilities.positionPurpose || ''
        },
        recruitInfo: {
            minEducation: formData.requirements.education || '',
            skillReq: formData.requirements.basicSkills || '',
            workExperience: formData.requirements.workExperienceReq || '',
            otherReq: formData.requirements.otherRequirements || ''
        }
    };

    try {
        const response = await fetch(API_BASE_URL + '/positions', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify(positionData)
        });

        const result = await response.json();

        if (result.success) {
            showToast(result.message || '崗位描述已成功儲存至崗位清單！');
            setTimeout(() => {
                switchModule('positionlist');
            }, 1500);
        } else {
            alert('儲存失敗: ' + (result.error || '未知錯誤'));
        }
    } catch (error) {
        console.error('儲存錯誤:', error);
        alert('儲存失敗: ' + error.message);
    }
}

export function cancelJobDescForm() {
    if (confirm('確定要取消嗎？未保存的資料將會遺失。')) {
        document.getElementById('jobDescForm').reset();
        document.getElementById('jd_mainResponsibilities').value = '1、\n2、\n3、\n4、';
        updatePreview();
    }
}

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

export function updatePreview() {
    const activeModuleBtn = document.querySelector('.module-btn.active');
    if (!activeModuleBtn) return;

    const activeModule = activeModuleBtn.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 {
        data = { module: '崗位描述', ...getJobDescFormData() };
    }
    const previewEl = document.getElementById('jsonPreview');
    if (previewEl) {
        previewEl.textContent = JSON.stringify(data, null, 2);
    }
}

// ==================== Toast 訊息 ====================

export function showToast(message) {
    const toast = document.getElementById('toast');
    const toastMessage = document.getElementById('toastMessage');
    if (!toast || !toastMessage) {
        console.warn('Toast elements not found, creating dynamic toast');
        const existingToast = document.querySelector('.toast.dynamic-toast');
        if (existingToast) existingToast.remove();

        const dynamicToast = document.createElement('div');
        dynamicToast.className = 'toast dynamic-toast show';
        dynamicToast.innerHTML = `
            <svg viewBox="0 0 24 24"><path d="M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z"/></svg>
            <span>${message}</span>
        `;
        document.body.appendChild(dynamicToast);
        setTimeout(() => {
            dynamicToast.classList.remove('show');
            setTimeout(() => dynamicToast.remove(), 300);
        }, 3000);
        return;
    }
    toastMessage.textContent = message;
    toast.classList.add('show');
    setTimeout(() => toast.classList.remove('show'), 3000);
}

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

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');
    }

    if (moduleName === 'positionlist') {
        loadPositionList();
    }

    updatePreview();
}

// ==================== 崗位清單功能 ====================

export async function loadPositionList() {
    try {
        showToast('正在載入崗位清單...');

        const response = await fetch(API_BASE_URL + '/position-list');
        const result = await response.json();

        if (result.success) {
            positionListData = result.data;
            renderPositionList();
            showToast('已載入 ' + positionListData.length + ' 筆崗位資料');
        } else {
            alert('載入失敗: ' + (result.error || '未知錯誤'));
            positionListData = [];
            renderPositionList();
        }
    } catch (error) {
        console.error('載入錯誤:', error);
        alert('載入失敗: ' + error.message);
        positionListData = [];
        renderPositionList();
    }
}

export function renderPositionList() {
    const tbody = document.getElementById('positionListBody');
    if (!tbody) return;

    if (positionListData.length === 0) {
        tbody.innerHTML = '<tr><td colspan="8" style="padding: 40px; text-align: center; color: var(--text-secondary);">沒有資料，請先建立崗位或點擊「載入清單」</td></tr>';
        return;
    }

    tbody.innerHTML = positionListData.map(item => `
        <tr style="border-bottom: 1px solid #eee;">
            <td style="padding: 12px;">${sanitizeHTML(item.positionCode)}</td>
            <td style="padding: 12px;">${sanitizeHTML(item.positionName)}</td>
            <td style="padding: 12px;">${sanitizeHTML(item.positionCategory || '')}</td>
            <td style="padding: 12px;">${sanitizeHTML(item.positionNature || '')}</td>
            <td style="padding: 12px;">${sanitizeHTML(String(item.headcount || ''))}</td>
            <td style="padding: 12px;">${sanitizeHTML(item.positionLevel || '')}</td>
            <td style="padding: 12px;">${sanitizeHTML(item.effectiveDate || '')}</td>
            <td style="padding: 12px; text-align: center;">
                <button class="btn btn-secondary" style="padding: 4px 8px; font-size: 12px;" onclick="viewPositionDesc('${sanitizeHTML(item.positionCode)}')">檢視</button>
            </td>
        </tr>
    `).join('');
}

export function sortPositionList(column) {
    if (currentSortColumn === column) {
        currentSortDirection = currentSortDirection === 'asc' ? 'desc' : 'asc';
    } else {
        currentSortColumn = column;
        currentSortDirection = 'asc';
    }

    positionListData.sort((a, b) => {
        let valA = a[column];
        let valB = b[column];

        if (typeof valA === 'string') {
            valA = valA.toLowerCase();
            valB = valB.toLowerCase();
        }

        if (valA < valB) return currentSortDirection === 'asc' ? -1 : 1;
        if (valA > valB) return currentSortDirection === 'asc' ? 1 : -1;
        return 0;
    });

    document.querySelectorAll('.sort-icon').forEach(icon => icon.textContent = '');
    const currentHeader = document.querySelector(`th[data-sort="${column}"] .sort-icon`);
    if (currentHeader) {
        currentHeader.textContent = currentSortDirection === 'asc' ? ' ^' : ' v';
    }

    renderPositionList();
}

// ==================== 工具函數 ====================

function sanitizeHTML(str) {
    if (str === null || str === undefined) return '';
    const temp = document.createElement('div');
    temp.textContent = str;
    return temp.innerHTML;
}

// 暴露全域函數
if (typeof window !== 'undefined') {
    window.showToast = showToast;
    window.updatePreview = updatePreview;
    window.switchModule = switchModule;
    window.updateCategoryName = updateCategoryName;
    window.updateNatureName = updateNatureName;
    window.updateJobCategoryName = updateJobCategoryName;
}