/* ===== 구매신청 페이지 ===== */
const TKUSER_BASE_URL = location.hostname.includes('technicalkorea.net')
    ? 'https://tkuser.technicalkorea.net'
    : location.protocol + '//' + location.hostname + ':30180';

const CAT_LABELS = { consumable: '소모품', safety: '안전용품', repair: '수선비', equipment: '설비' };
const CAT_COLORS = { consumable: 'badge-blue', safety: 'badge-green', repair: 'badge-amber', equipment: 'badge-purple' };
const STATUS_LABELS = { pending: '대기', purchased: '구매완료', hold: '보류' };
const STATUS_COLORS = { pending: 'badge-amber', purchased: 'badge-green', hold: 'badge-gray' };

let consumableItems = [];
let vendorsList = [];
let requestsList = [];
let currentRequestForPurchase = null;
let currentRequestForHold = null;
let isAdmin = false;

async function loadInitialData() {
    try {
        const [itemsRes, vendorsRes] = await Promise.all([
            api('/purchase-requests/consumable-items'),
            api('/purchase-requests/vendors')
        ]);
        consumableItems = itemsRes.data || [];
        vendorsList = vendorsRes.data || [];
        populateItemSelect();
        populateVendorSelect();
    } catch (e) {
        console.error('초기 데이터 로드 실패:', e);
    }
}

function populateItemSelect() {
    const sel = document.getElementById('prItemSelect');
    const groups = {};
    consumableItems.forEach(item => {
        const cat = CAT_LABELS[item.category] || item.category;
        if (!groups[cat]) groups[cat] = [];
        groups[cat].push(item);
    });
    let html = '<option value="">소모품 선택</option>';
    for (const [cat, items] of Object.entries(groups)) {
        html += `<optgroup label="${cat}">`;
        items.forEach(item => {
            const maker = item.maker ? ` (${escapeHtml(item.maker)})` : '';
            html += `<option value="${item.item_id}">${escapeHtml(item.item_name)}${maker}</option>`;
        });
        html += '</optgroup>';
    }
    sel.innerHTML = html;
}

function populateVendorSelect() {
    const sel = document.getElementById('pmVendor');
    sel.innerHTML = '<option value="">업체 선택 (선택사항)</option>' +
        vendorsList.map(v => `<option value="${v.vendor_id}">${escapeHtml(v.vendor_name)}</option>`).join('');
}

function onItemSelect() {
    const itemId = parseInt(document.getElementById('prItemSelect').value);
    const preview = document.getElementById('prItemPreview');
    const item = consumableItems.find(i => i.item_id === itemId);
    if (!item) { preview.classList.add('hidden'); return; }

    preview.classList.remove('hidden');
    const photoEl = document.getElementById('prItemPhoto');
    if (item.photo_path) {
        photoEl.src = TKUSER_BASE_URL + item.photo_path;
        photoEl.classList.remove('hidden');
        photoEl.onerror = () => photoEl.classList.add('hidden');
    } else {
        photoEl.classList.add('hidden');
    }
    document.getElementById('prItemInfo').textContent = `${item.item_name} ${item.maker ? '(' + item.maker + ')' : ''}`;
    const price = item.base_price ? Number(item.base_price).toLocaleString() + '원/' + (item.unit || 'EA') : '기준가 미설정';
    document.getElementById('prItemPrice').textContent = price;
}

/* ===== 구매신청 제출 ===== */
async function submitPurchaseRequest() {
    const item_id = document.getElementById('prItemSelect').value;
    const quantity = parseInt(document.getElementById('prQuantity').value) || 0;
    const notes = document.getElementById('prNotes').value.trim();

    if (!item_id) { showToast('소모품을 선택해주세요.', 'error'); return; }
    if (quantity < 1) { showToast('수량은 1 이상이어야 합니다.', 'error'); return; }

    try {
        await api('/purchase-requests', {
            method: 'POST',
            body: JSON.stringify({ item_id: parseInt(item_id), quantity, notes })
        });
        showToast('구매신청이 등록되었습니다.');
        document.getElementById('prItemSelect').value = '';
        document.getElementById('prQuantity').value = '1';
        document.getElementById('prNotes').value = '';
        document.getElementById('prItemPreview').classList.add('hidden');
        await loadRequests();
    } catch (e) { showToast(e.message, 'error'); }
}

/* ===== 신청 목록 ===== */
async function loadRequests() {
    try {
        const status = document.getElementById('prFilterStatus').value;
        const category = document.getElementById('prFilterCategory').value;
        const params = new URLSearchParams();
        if (status) params.set('status', status);
        if (category) params.set('category', category);
        const res = await api('/purchase-requests?' + params.toString());
        requestsList = res.data || [];
        renderRequests();
    } catch (e) {
        document.getElementById('prRequestList').innerHTML = `<tr><td colspan="7" class="px-4 py-8 text-center text-red-500">${escapeHtml(e.message)}</td></tr>`;
    }
}

function renderRequests() {
    const tbody = document.getElementById('prRequestList');
    if (!requestsList.length) {
        tbody.innerHTML = '<tr><td colspan="7" class="px-4 py-8 text-center text-gray-400">구매신청 내역이 없습니다.</td></tr>';
        return;
    }
    tbody.innerHTML = requestsList.map(r => {
        const catLabel = CAT_LABELS[r.category] || r.category;
        const catColor = CAT_COLORS[r.category] || 'badge-gray';
        const statusLabel = STATUS_LABELS[r.status] || r.status;
        const statusColor = STATUS_COLORS[r.status] || 'badge-gray';
        const photoSrc = r.photo_path ? TKUSER_BASE_URL + r.photo_path : '';

        let actions = '';
        if (isAdmin && r.status === 'pending') {
            actions = `<button onclick="openPurchaseModal(${r.request_id})" class="px-2 py-1 bg-orange-500 text-white rounded text-xs hover:bg-orange-600 mr-1" title="구매 처리"><i class="fas fa-shopping-cart"></i></button>
                <button onclick="openHoldModal(${r.request_id})" class="px-2 py-1 bg-gray-400 text-white rounded text-xs hover:bg-gray-500" title="보류"><i class="fas fa-pause"></i></button>`;
        } else if (isAdmin && r.status === 'hold') {
            actions = `<button onclick="revertRequest(${r.request_id})" class="px-2 py-1 bg-blue-500 text-white rounded text-xs hover:bg-blue-600" title="대기로 되돌리기"><i class="fas fa-undo"></i></button>`;
        }
        if (r.status === 'pending' && (isAdmin || r.requester_id === currentUser.id)) {
            actions += ` <button onclick="deleteRequest(${r.request_id})" class="px-2 py-1 bg-red-400 text-white rounded text-xs hover:bg-red-500" title="삭제"><i class="fas fa-trash"></i></button>`;
        }

        return `<tr class="hover:bg-gray-50">
            <td class="px-4 py-3">
                <div class="flex items-center gap-2">
                    ${photoSrc ? `<img src="${photoSrc}" class="w-8 h-8 rounded object-cover" onerror="this.style.display='none'">` : ''}
                    <div>
                        <div class="font-medium text-gray-800">${escapeHtml(r.item_name)}</div>
                        <div class="text-xs text-gray-500">${escapeHtml(r.maker || '')}</div>
                    </div>
                </div>
            </td>
            <td class="px-4 py-3"><span class="badge ${catColor}">${catLabel}</span></td>
            <td class="px-4 py-3 text-right font-medium">${r.quantity}</td>
            <td class="px-4 py-3 text-gray-600">${escapeHtml(r.requester_name || '')}</td>
            <td class="px-4 py-3 text-gray-600">${formatDate(r.request_date)}</td>
            <td class="px-4 py-3 text-center">
                <span class="badge ${statusColor}">${statusLabel}</span>
                ${r.status === 'hold' && r.hold_reason ? `<div class="text-xs text-gray-400 mt-1">${escapeHtml(r.hold_reason)}</div>` : ''}
            </td>
            <td class="px-4 py-3 text-center">${actions}</td>
        </tr>`;
    }).join('');
}

/* ===== 구매 처리 모달 ===== */
function openPurchaseModal(requestId) {
    const r = requestsList.find(x => x.request_id === requestId);
    if (!r) return;
    currentRequestForPurchase = r;

    const basePrice = r.base_price ? Number(r.base_price).toLocaleString() + '원' : '-';
    document.getElementById('purchaseModalInfo').innerHTML = `
        <div class="font-medium">${escapeHtml(r.item_name)} ${r.maker ? '(' + escapeHtml(r.maker) + ')' : ''}</div>
        <div class="text-xs text-gray-500 mt-1">분류: ${CAT_LABELS[r.category] || r.category} | 기준가: ${basePrice} | 신청수량: ${r.quantity}</div>
    `;
    document.getElementById('pmUnitPrice').value = r.base_price || '';
    document.getElementById('pmQuantity').value = r.quantity;
    document.getElementById('pmDate').value = new Date().toISOString().substring(0, 10);
    document.getElementById('pmNotes').value = '';
    document.getElementById('pmPriceDiffArea').innerHTML = '';
    document.getElementById('purchaseModal').classList.remove('hidden');
    showPriceDiff();
}

function closePurchaseModal() {
    document.getElementById('purchaseModal').classList.add('hidden');
    currentRequestForPurchase = null;
}

function showPriceDiff() {
    if (!currentRequestForPurchase) return;
    const basePrice = Number(currentRequestForPurchase.base_price) || 0;
    const unitPrice = Number(document.getElementById('pmUnitPrice').value) || 0;
    const area = document.getElementById('pmPriceDiffArea');

    if (basePrice > 0 && unitPrice > 0 && basePrice !== unitPrice) {
        const diff = unitPrice - basePrice;
        const arrow = diff > 0 ? '&#9650;' : '&#9660;';
        const color = diff > 0 ? 'text-red-600' : 'text-blue-600';
        area.innerHTML = `
            <div class="flex items-center gap-2 text-sm ${color}">
                <span>기준가 ${basePrice.toLocaleString()}원 &rarr; 실구매가 ${unitPrice.toLocaleString()}원 ${arrow}${Math.abs(diff).toLocaleString()}</span>
            </div>
            <label class="flex items-center gap-2 mt-1 cursor-pointer">
                <input type="checkbox" id="pmUpdateBasePrice" class="h-4 w-4 rounded">
                <span class="text-xs text-gray-600">기준가를 ${unitPrice.toLocaleString()}원으로 업데이트</span>
            </label>`;
    } else {
        area.innerHTML = '';
    }
}

async function submitPurchase() {
    if (!currentRequestForPurchase) return;
    const unit_price = Number(document.getElementById('pmUnitPrice').value);
    const purchase_date = document.getElementById('pmDate').value;
    if (!unit_price) { showToast('구매 단가를 입력해주세요.', 'error'); return; }
    if (!purchase_date) { showToast('구매일을 입력해주세요.', 'error'); return; }

    const updateCheckbox = document.getElementById('pmUpdateBasePrice');
    const body = {
        request_id: currentRequestForPurchase.request_id,
        item_id: currentRequestForPurchase.item_id,
        vendor_id: parseInt(document.getElementById('pmVendor').value) || null,
        quantity: parseInt(document.getElementById('pmQuantity').value) || currentRequestForPurchase.quantity,
        unit_price,
        purchase_date,
        update_base_price: updateCheckbox ? updateCheckbox.checked : false,
        notes: document.getElementById('pmNotes').value.trim()
    };

    try {
        const res = await api('/purchases', { method: 'POST', body: JSON.stringify(body) });
        let msg = '구매 처리가 완료되었습니다.';
        if (res.data?.equipment?.success) msg += ` 설비 ${res.data.equipment.equipment_code} 자동 등록됨.`;
        else if (res.data?.equipment && !res.data.equipment.success) msg += ' (설비 자동 등록 실패 - 수동 등록 필요)';
        showToast(msg);
        closePurchaseModal();
        await loadRequests();
    } catch (e) { showToast(e.message, 'error'); }
}

/* ===== 보류 모달 ===== */
function openHoldModal(requestId) {
    currentRequestForHold = requestId;
    document.getElementById('holdReason').value = '';
    document.getElementById('holdModal').classList.remove('hidden');
}

function closeHoldModal() {
    document.getElementById('holdModal').classList.add('hidden');
    currentRequestForHold = null;
}

async function submitHold() {
    if (!currentRequestForHold) return;
    const hold_reason = document.getElementById('holdReason').value.trim();
    try {
        await api(`/purchase-requests/${currentRequestForHold}/hold`, {
            method: 'PUT',
            body: JSON.stringify({ hold_reason })
        });
        showToast('보류 처리되었습니다.');
        closeHoldModal();
        await loadRequests();
    } catch (e) { showToast(e.message, 'error'); }
}

/* ===== 기타 액션 ===== */
async function revertRequest(requestId) {
    if (!confirm('이 신청을 대기 상태로 되돌리시겠습니까?')) return;
    try {
        await api(`/purchase-requests/${requestId}/revert`, { method: 'PUT' });
        showToast('대기 상태로 되돌렸습니다.');
        await loadRequests();
    } catch (e) { showToast(e.message, 'error'); }
}

async function deleteRequest(requestId) {
    if (!confirm('이 구매신청을 삭제하시겠습니까?')) return;
    try {
        await api(`/purchase-requests/${requestId}`, { method: 'DELETE' });
        showToast('삭제되었습니다.');
        await loadRequests();
    } catch (e) { showToast(e.message, 'error'); }
}

/* ===== Init ===== */
(async function() {
    if (!await initAuth()) return;
    isAdmin = currentUser && ['admin', 'system', 'system admin'].includes(currentUser.role);
    await loadInitialData();
    await loadRequests();
})();