(function(){
    "use strict";
    const csrf = document.querySelector('meta[name="staff-csrf-token"]').content;
    const fileInput = document.getElementById('order-file');
    const fileName = document.getElementById('file-name');
    const form = document.getElementById('order-import-form');
    const status = document.getElementById('import-status');
    const results = document.getElementById('import-results');
    const confirmButton = document.getElementById('confirm-import');
    let selectedFile = null;
    let canConfirm = false;
    let orderBefore = null;

    function setStatus(message, isError){
        status.textContent = message || '';
        status.classList.toggle('is-error', Boolean(isError));
    }
    function escapeText(value){
        return String(value == null ? '' : value).replace(/[&<>"']/g, function(character){
            return {'&':'&amp;','<':'&lt;','>':'&gt;','"':'&quot;',"'":'&#39;'}[character];
        });
    }
    function showResponse(data){
        results.hidden = false;
        const summary = data.summary || {};
        document.getElementById('import-summary').innerHTML = [
            ['文件数据行', summary.total_rows], ['有效行', summary.valid_rows],
            ['重复保留', summary.duplicate_rows], ['错误行', summary.error_rows]
        ].map(function(item){
            return '<div class="summary-item"><span>'+escapeText(item[0])+'</span><strong>'+escapeText(item[1] || 0)+'</strong></div>';
        }).join('');
        document.getElementById('preview-rows').innerHTML = (data.preview || []).map(function(row){
            return '<tr><td>'+escapeText(row.row)+'</td><td>'+escapeText(row.tenant_id)+'</td><td>'+escapeText(row.order_no)+'</td><td>'+escapeText(row.status)+'</td><td>'+escapeText(row.inbound_code)+'</td><td class="'+(row.duplicate ? 'row-duplicate' : 'row-new')+'">'+(row.duplicate ? '已存在，保留原数据' : '可新增')+'</td></tr>';
        }).join('') || '<tr><td colspan="6">没有可预览的有效数据</td></tr>';
        document.getElementById('preview-limit-note').hidden = !data.preview_limited;
        const errors = document.getElementById('import-errors');
        errors.innerHTML = (data.errors || []).map(function(item){
            return '<p>第 '+escapeText(item.row)+' 行：'+escapeText(item.message)+'</p>';
        }).join('');
        errors.hidden = !data.errors || !data.errors.length;
        document.getElementById('results-caption').textContent = errors.hidden
            ? '请确认租户、订单号及重复记录处理方式。'
            : '发现错误行；请修正文件后重新上传，当前不会写入数据。';
        canConfirm = Boolean(data.ok && summary.valid_rows);
        confirmButton.hidden = !canConfirm;
    }
    async function sendFile(path){
        const body = new FormData();
        body.append('file', selectedFile);
        const response = await fetch(path, {method:'POST', body:body, credentials:'same-origin',
            headers:{'X-CSRF-Token':csrf, 'Accept':'application/json'}, signal:AbortSignal.timeout(30000)});
        const data = await response.json();
        if(!response.ok && !data.summary) throw new Error(data.error || '请求失败，请稍后重试。');
        return data;
    }
    async function requestJson(path, options){
        options = options || {};
        options.credentials = 'same-origin';
        options.headers = Object.assign({'Accept':'application/json'}, options.headers || {});
        const response = await fetch(path, options);
        const data = await response.json();
        if(!response.ok) throw new Error(data.error || '请求失败，请稍后重试。');
        return data;
    }
    function renderOrders(data, append){
        const body = document.getElementById('order-list-rows');
        const rows = (data.orders || []).map(function(row){
            return '<tr><td>'+escapeText(row.tenant_id)+'</td><td><strong>'+escapeText(row.order_no)+'</strong></td><td>'+escapeText(row.status)+'</td><td>'+escapeText(row.inbound_code)+'</td><td>'+escapeText(row.shipment_id)+'</td><td>'+escapeText(row.country_code)+'</td><td>'+escapeText(row.source_updated_at)+'</td></tr>';
        }).join('');
        if(!append) body.innerHTML = '';
        body.insertAdjacentHTML('beforeend', rows || (!append ? '<tr><td colspan="7">没有找到订单</td></tr>' : ''));
        orderBefore = data.next_before || null;
        document.getElementById('load-more-orders').hidden = !orderBefore;
        document.getElementById('order-list-status').textContent = '共 '+escapeText(data.total || 0)+' 条订单';
    }
    async function loadOrders(append){
        const params = new URLSearchParams({q:document.getElementById('order-query').value.trim(), tenant:document.getElementById('order-tenant').value.trim(), status:document.getElementById('order-status').value, limit:'50'});
        if(append && orderBefore) params.set('before', orderBefore);
        const data = await requestJson('/api/admin/orders/list?'+params.toString());
        renderOrders(data, append);
    }
    async function loadBatches(){
        const data = await requestJson('/api/admin/orders/import/batches');
        document.getElementById('import-batch-rows').innerHTML = (data.batches || []).map(function(batch){
            const active = batch.state === 'active';
            const action = active ? '<button class="button-secondary batch-undo" data-batch-id="'+escapeText(batch.id)+'" type="button">撤销</button>' : '已撤销（删 '+escapeText(batch.deleted_rows)+'，留 '+escapeText(batch.preserved_on_undo)+'）';
            return '<tr><td>'+escapeText(batch.imported_at)+'</td><td>'+escapeText(batch.filename)+'</td><td>'+escapeText(batch.imported_by)+'</td><td>'+escapeText(batch.imported_rows)+'</td><td>'+escapeText(batch.preserved_rows)+'</td><td>'+escapeText(active ? '可撤销' : '已撤销')+'</td><td>'+action+'</td></tr>';
        }).join('') || '<tr><td colspan="7">暂无导入记录</td></tr>';
        document.querySelectorAll('.batch-undo').forEach(function(button){
            button.addEventListener('click', async function(){
                if(!await SupportUI.confirm('撤销后只会删除本批次中仍未被修改的新增订单，确定继续吗？',{title:'撤销导入'})) return;
                button.disabled = true;
                try{
                    const result = await requestJson('/api/admin/orders/import/batches/'+encodeURIComponent(button.dataset.batchId)+'/undo',{method:'POST',headers:{'X-CSRF-Token':csrf}});
                    setStatus('批次已处理：删除 '+result.deleted+' 条，保留 '+result.preserved+' 条。');
                    await Promise.all([loadBatches(), loadOrders(false)]);
                }catch(error){ setStatus(error.message, true); button.disabled = false; }
            });
        });
    }
    fileInput.addEventListener('change', function(){
        selectedFile = fileInput.files[0] || null;
        fileName.textContent = selectedFile ? selectedFile.name : '选择订单文件';
        results.hidden = true;
        canConfirm = false;
        confirmButton.hidden = true;
        setStatus('');
    });
    form.addEventListener('submit', async function(event){
        event.preventDefault();
        if(!selectedFile) return;
        const button = document.getElementById('preview-import');
        button.disabled = true;
        setStatus('正在读取并校验文件…');
        try{
            const data = await sendFile('/api/admin/orders/import/preview');
            showResponse(data);
            setStatus(data.ok ? '校验完成，请检查结果。' : '发现错误行，请先修正文件。', !data.ok);
        }catch(error){ setStatus(error.message || '校验失败，请检查网络后重试。', true); }
        finally{ button.disabled = false; }
    });
    confirmButton.addEventListener('click', async function(){
        if(!canConfirm || !selectedFile) return;
        confirmButton.disabled = true;
        setStatus('正在重新校验并导入…');
        try{
            const data = await sendFile('/api/admin/orders/import');
            canConfirm = false;
            confirmButton.hidden = true;
            fileInput.value = '';
            selectedFile = null;
            fileName.textContent = '选择订单文件';
            setStatus('导入完成：新增 '+data.imported+' 条，重复保留 '+data.preserved+' 条。');
            const refreshed = await Promise.allSettled([loadBatches(), loadOrders(false)]);
            if(refreshed[0].status === 'rejected'){
                document.getElementById('import-batch-rows').innerHTML = '<tr><td colspan="7">导入已完成，但记录刷新失败，请刷新页面重试。</td></tr>';
            }
            if(refreshed[1].status === 'rejected'){
                document.getElementById('order-list-status').textContent = '导入已完成，但订单列表刷新失败：'+refreshed[1].reason.message;
            }
            if(refreshed.some(function(result){ return result.status === 'rejected'; })){
                setStatus('导入已完成，但部分列表刷新失败，请刷新页面查看。', true);
            }
        }catch(error){ setStatus(error.message || '导入失败，请检查网络后重试。', true); }
        finally{ confirmButton.disabled = false; }
    });
    document.getElementById('order-search-form').addEventListener('submit', async function(event){
        event.preventDefault();
        try { await loadOrders(false); } catch(error) { document.getElementById('order-list-status').textContent = error.message; }
    });
    document.getElementById('load-more-orders').addEventListener('click', async function(){
        this.disabled = true;
        try { await loadOrders(true); } catch(error) { document.getElementById('order-list-status').textContent = error.message; }
        finally { this.disabled = false; }
    });
    Promise.all([loadOrders(false), loadBatches()]).catch(function(error){ document.getElementById('order-list-status').textContent = error.message; });
    document.getElementById('staff-logout').addEventListener('click', async function(){
        this.disabled = true;
        try{
            await fetch('/admin/logout', {method:'POST', credentials:'same-origin', headers:{'X-CSRF-Token':csrf}});
        }finally{ location.assign('/admin'); }
    });
})();