/* ===== Checklist Management (체크리스트 관리 - 관리자) ===== */
let checklistItems = [];
let weatherConditions = [];
let workTypes = [];
let editingItemId = null;
let currentTab = 'basic';

/* ===== Tab switching ===== */
function switchTab(tab) {
    currentTab = tab;
    ['basic', 'weather', 'worktype'].forEach(t => {
        document.getElementById('panel' + t.charAt(0).toUpperCase() + t.slice(1)).classList.toggle('hidden', t !== tab);
        const tabBtn = document.getElementById('tab' + t.charAt(0).toUpperCase() + t.slice(1));
        if (t === tab) {
            tabBtn.classList.add('active');
        } else {
            tabBtn.classList.remove('active');
        }
    });
}

/* ===== Load checklist items ===== */
async function loadChecklistItems() {
    try {
        const res = await api('/checklist');
        checklistItems = res.data || [];
        renderBasicItems();
        renderWeatherItems();
        renderWorktypeItems();
    } catch (e) {
        showToast('체크리스트 로드 실패: ' + e.message, 'error');
    }
}

/* ===== Load lookup data ===== */
async function loadLookupData() {
    try {
        const [wcRes, wtRes] = await Promise.all([
            api('/checklist/weather-conditions'),
            api('/checklist/work-types')
        ]);
        weatherConditions = wcRes.data || [];
        workTypes = wtRes.data || [];

        // Populate selects
        document.getElementById('itemWeatherCondition').innerHTML = '<option value="">선택</option>' +
            weatherConditions.map(w => `<option value="${w.condition_id}">${escapeHtml(w.condition_name)}</option>`).join('');

        document.getElementById('itemWorkType').innerHTML = '<option value="">선택</option>' +
            workTypes.map(w => `<option value="${w.work_type_id}">${escapeHtml(w.work_type_name)}</option>`).join('');
    } catch (e) {
        console.error('Lookup data load error:', e);
    }
}

/* ===== Load tasks by work type ===== */
async function loadTasksByWorkType(workTypeId) {
    const taskSelect = document.getElementById('itemTask');
    if (!workTypeId) {
        taskSelect.innerHTML = '<option value="">공정을 먼저 선택하세요</option>';
        document.getElementById('taskField').classList.add('hidden');
        return;
    }
    try {
        const res = await api('/checklist/tasks/' + workTypeId);
        const tasks = res.data || [];
        taskSelect.innerHTML = '<option value="">작업 선택</option>' +
            tasks.map(t => `<option value="${t.task_id}">${escapeHtml(t.task_name)}</option>`).join('');
        document.getElementById('taskField').classList.remove('hidden');
    } catch (e) {
        console.error('Task load error:', e);
        taskSelect.innerHTML = '<option value="">로드 실패</option>';
    }
}

/* ===== Work type change handler ===== */
function onWorkTypeChange() {
    const workTypeId = document.getElementById('itemWorkType').value;
    loadTasksByWorkType(workTypeId);
}

/* ===== Render basic items ===== */
function renderBasicItems() {
    const items = checklistItems.filter(i => i.item_type === 'basic');
    const container = document.getElementById('basicItemsList');
    if (!items.length) {
        container.innerHTML = '<div class="text-center text-gray-400 py-8">기본 항목이 없습니다</div>';
        return;
    }

    // Group by category
    const groups = {};
    items.forEach(i => {
        const cat = i.category || '미분류';
        if (!groups[cat]) groups[cat] = [];
        groups[cat].push(i);
    });

    container.innerHTML = Object.entries(groups).map(([cat, items]) => `
        <div class="border rounded-lg overflow-hidden">
            <div class="bg-gray-50 px-4 py-2 font-medium text-sm text-gray-700">${escapeHtml(cat)}</div>
            <div class="divide-y">
                ${items.map(i => renderItemRow(i)).join('')}
            </div>
        </div>
    `).join('');
}

/* ===== Render weather items ===== */
function renderWeatherItems() {
    const items = checklistItems.filter(i => i.item_type === 'weather');
    const container = document.getElementById('weatherItemsList');
    if (!items.length) {
        container.innerHTML = '<div class="text-center text-gray-400 py-8">날씨별 항목이 없습니다</div>';
        return;
    }

    // Group by weather condition
    const groups = {};
    items.forEach(i => {
        const cond = i.weather_condition_name || '미지정';
        if (!groups[cond]) groups[cond] = [];
        groups[cond].push(i);
    });

    container.innerHTML = Object.entries(groups).map(([cond, items]) => `
        <div class="border rounded-lg overflow-hidden">
            <div class="bg-blue-50 px-4 py-2 font-medium text-sm text-blue-700">
                <i class="fas fa-cloud mr-1"></i>${escapeHtml(cond)}
            </div>
            <div class="divide-y">
                ${items.map(i => renderItemRow(i)).join('')}
            </div>
        </div>
    `).join('');
}

/* ===== Render worktype items (2-level: work_type → task) ===== */
function renderWorktypeItems() {
    const items = checklistItems.filter(i => i.item_type === 'task');
    const container = document.getElementById('worktypeItemsList');
    if (!items.length) {
        container.innerHTML = '<div class="text-center text-gray-400 py-8">작업별 항목이 없습니다</div>';
        return;
    }

    // 2-level grouping: work_type → task
    const wtGroups = {};
    items.forEach(i => {
        const wt = i.work_type_name || '미지정';
        if (!wtGroups[wt]) wtGroups[wt] = {};
        const task = i.task_name || '미지정';
        if (!wtGroups[wt][task]) wtGroups[wt][task] = [];
        wtGroups[wt][task].push(i);
    });

    container.innerHTML = Object.entries(wtGroups).map(([wt, taskGroups]) => `
        <div class="border rounded-lg overflow-hidden">
            <div class="bg-amber-50 px-4 py-2 font-medium text-sm text-amber-700">
                <i class="fas fa-hard-hat mr-1"></i>${escapeHtml(wt)}
            </div>
            ${Object.entries(taskGroups).map(([task, items]) => `
                <div class="border-t">
                    <div class="bg-amber-50/50 px-4 py-1.5 text-xs font-medium text-amber-600 pl-8">
                        <i class="fas fa-wrench mr-1"></i>${escapeHtml(task)}
                    </div>
                    <div class="divide-y">
                        ${items.map(i => renderItemRow(i)).join('')}
                    </div>
                </div>
            `).join('')}
        </div>
    `).join('');
}

/* ===== Render single item row ===== */
function renderItemRow(item) {
    const activeClass = item.is_active ? '' : 'opacity-50';
    const activeIcon = item.is_active
        ? '<i class="fas fa-check-circle text-green-500 text-xs"></i>'
        : '<i class="fas fa-times-circle text-gray-400 text-xs"></i>';
    return `
        <div class="flex items-center justify-between px-4 py-2.5 hover:bg-gray-50 ${activeClass}">
            <div class="flex items-center gap-2 flex-1 min-w-0">
                ${activeIcon}
                <span class="text-sm text-gray-700 truncate">${escapeHtml(item.item_content)}</span>
                ${item.category ? `<span class="badge badge-gray text-xs">${escapeHtml(item.category)}</span>` : ''}
            </div>
            <div class="flex items-center gap-1 flex-shrink-0 ml-2">
                <span class="text-xs text-gray-400 mr-2">#${item.display_order}</span>
                <button onclick="openEditItem(${item.item_id})" class="text-gray-400 hover:text-gray-600 text-xs p-1" title="수정">
                    <i class="fas fa-pen"></i>
                </button>
                <button onclick="doDeleteItem(${item.item_id})" class="text-gray-400 hover:text-red-500 text-xs p-1" title="삭제">
                    <i class="fas fa-trash"></i>
                </button>
            </div>
        </div>
    `;
}

/* ===== Add/Edit Modal ===== */
function openAddItem(tab) {
    editingItemId = null;
    document.getElementById('itemModalTitle').textContent = '체크리스트 항목 추가';
    document.getElementById('itemForm').reset();
    document.getElementById('itemIsActive').checked = true;
    document.getElementById('itemDisplayOrder').value = '0';

    // Set type based on tab
    const typeMap = { basic: 'basic', weather: 'weather', worktype: 'task' };
    document.getElementById('itemType').value = typeMap[tab] || 'basic';
    toggleTypeFields();

    document.getElementById('itemModal').classList.remove('hidden');
}

async function openEditItem(id) {
    const item = checklistItems.find(i => i.item_id === id);
    if (!item) return;
    editingItemId = id;
    document.getElementById('itemModalTitle').textContent = '체크리스트 항목 수정';
    document.getElementById('itemType').value = item.item_type;
    document.getElementById('itemCategory').value = item.category || '';
    document.getElementById('itemContent').value = item.item_content || '';
    document.getElementById('itemDisplayOrder').value = item.display_order || 0;
    document.getElementById('itemIsActive').checked = item.is_active !== false && item.is_active !== 0;

    if (item.weather_condition_id) {
        document.getElementById('itemWeatherCondition').value = item.weather_condition_id;
    }
    if (item.work_type_id) {
        document.getElementById('itemWorkType').value = item.work_type_id;
        // Load tasks first, then set value after load completes
        await loadTasksByWorkType(item.work_type_id);
        if (item.task_id) {
            document.getElementById('itemTask').value = item.task_id;
        }
    }

    toggleTypeFields();
    document.getElementById('itemModal').classList.remove('hidden');
}

function closeItemModal() {
    document.getElementById('itemModal').classList.add('hidden');
    document.getElementById('taskField').classList.add('hidden');
    editingItemId = null;
}

function toggleTypeFields() {
    const type = document.getElementById('itemType').value;
    document.getElementById('weatherConditionField').classList.toggle('hidden', type !== 'weather');
    document.getElementById('workTypeField').classList.toggle('hidden', type !== 'task');
    // Hide task field when type changes away from task
    if (type !== 'task') {
        document.getElementById('taskField').classList.add('hidden');
    } else {
        // Show task field if work type is already selected
        const workTypeId = document.getElementById('itemWorkType').value;
        if (workTypeId) {
            document.getElementById('taskField').classList.remove('hidden');
        }
    }
}

/* ===== Submit item ===== */
async function submitItem(e) {
    e.preventDefault();
    const data = {
        item_type: document.getElementById('itemType').value,
        category: document.getElementById('itemCategory').value.trim() || null,
        item_content: document.getElementById('itemContent').value.trim(),
        display_order: parseInt(document.getElementById('itemDisplayOrder').value) || 0,
        is_active: document.getElementById('itemIsActive').checked
    };

    if (!data.item_content) { showToast('점검 항목을 입력해주세요', 'error'); return; }

    if (data.item_type === 'weather') {
        data.weather_condition_id = parseInt(document.getElementById('itemWeatherCondition').value) || null;
        if (!data.weather_condition_id) { showToast('날씨 조건을 선택해주세요', 'error'); return; }
    }
    if (data.item_type === 'task') {
        const taskId = parseInt(document.getElementById('itemTask').value) || null;
        if (!taskId) { showToast('작업을 선택해주세요', 'error'); return; }
        data.task_id = taskId;
    }

    try {
        if (editingItemId) {
            await api('/checklist/' + editingItemId, { method: 'PUT', body: JSON.stringify(data) });
            showToast('수정되었습니다');
        } else {
            await api('/checklist', { method: 'POST', body: JSON.stringify(data) });
            showToast('추가되었습니다');
        }
        closeItemModal();
        await loadChecklistItems();
    } catch (e) {
        showToast(e.message, 'error');
    }
}

/* ===== Delete item ===== */
async function doDeleteItem(id) {
    if (!confirm('이 항목을 삭제하시겠습니까?')) return;
    try {
        await api('/checklist/' + id, { method: 'DELETE' });
        showToast('삭제되었습니다');
        await loadChecklistItems();
    } catch (e) {
        showToast(e.message, 'error');
    }
}

/* ===== Init ===== */
function initChecklistPage() {
    if (!initAuth()) return;

    // Check admin
    const isAdmin = currentUser && ['admin', 'system'].includes(currentUser.role);
    if (!isAdmin) {
        document.querySelector('.flex-1.min-w-0').innerHTML = `
            <div class="bg-white rounded-xl shadow-sm p-10 text-center">
                <i class="fas fa-lock text-4xl text-gray-300 mb-4"></i>
                <p class="text-gray-500">관리자 권한이 필요합니다</p>
            </div>`;
        return;
    }

    // Type change handler
    document.getElementById('itemType').addEventListener('change', toggleTypeFields);
    document.getElementById('itemWorkType').addEventListener('change', onWorkTypeChange);
    document.getElementById('itemForm').addEventListener('submit', submitItem);

    loadLookupData();
    loadChecklistItems();
}