import { useEffect, useState } from 'react';
import { Download, Eye, Search } from 'lucide-react';
import { adminApi, fileDownloadUrl, type ReportMaterialBatch, type ReportTask } from '@/api/adminApi';
import {
  Breadcrumb,
  Button,
  CarrierTag,
  DateRangeInput,
  Input,
  Modal,
  Pagination,
  Select,
  Table,
  Tag,
  Textarea,
  type DateRangeValue,
  type TableColumn,
} from '@/components/ui';
import { formatDateTime } from '@/utils/dateTime';

const statusLabels: Record<string, string> = {
  completed: '生成完成',
  partial_failed: '部分生成',
  failed: '生成失败',
  generating: '生成中',
  pending: '未报备',
  waiting_material: '资料待补充',
  reporting: '报备中',
  approved: '报备通过',
  rejected: '报备失败',
  abandoned: '已放弃',
};

export function AdminReportBatchesPage() {
  const [items, setItems] = useState<ReportMaterialBatch[]>([]);
  const [keyword, setKeyword] = useState('');
  const [dateRange, setDateRange] = useState<DateRangeValue>({});
  const [page, setPage] = useState(1);
  const [total, setTotal] = useState(0);
  const [detail, setDetail] = useState<ReportMaterialBatch>();
  const [tasks, setTasks] = useState<ReportTask[]>([]);
  const [selected, setSelected] = useState<Set<string>>(new Set());
  const [nextStatus, setNextStatus] = useState('reporting');
  const [reason, setReason] = useState('');
  const [error, setError] = useState('');
  const pageSize = 20;

  function load(target = page) {
    adminApi
      .listReportMaterialBatches({
        keyword: keyword.trim() || undefined,
        startAt: dateRange.start,
        endAt: dateRange.end,
        page: target,
        pageSize,
      })
      .then((result) => {
        setItems(result.items);
        setTotal(result.total);
        setError('');
      })
      .catch((failure: Error) => setError(failure.message || '报备批次加载失败'));
  }
  useEffect(() => {
    load(page);
  }, [page]);

  async function openBatch(batch: ReportMaterialBatch) {
    try {
      const [batchDetail, taskPage] = await Promise.all([
        adminApi.getReportMaterialBatch(batch.id),
        adminApi.listReportMaterialBatchTasks(batch.id, { page: 1, pageSize: 100 }),
      ]);
      setDetail(batchDetail);
      setTasks(taskPage.items);
      setSelected(new Set());
      setError('');
    } catch (failure) {
      setError(failure instanceof Error ? failure.message : '批次明细加载失败');
    }
  }
  async function saveStatuses() {
    const chosen = tasks.filter((task) => selected.has(task.id));
    if (!chosen.length) return;
    try {
      await adminApi.changeReportTaskStatuses({
        items: chosen.map((task) => ({
          signatureId: task.signatureId,
          channelId: task.channelId,
          carrier: task.carrier ?? undefined,
          reportType: task.reportType,
          drainageItemId: task.drainageItemId ?? undefined,
          status: nextStatus,
        })),
        reason: reason.trim() || undefined,
        sourceEntry: 'report_task',
      });
      if (detail) await openBatch(detail);
    } catch (failure) {
      setError(failure instanceof Error ? failure.message : '批量状态修改失败');
    }
  }
  async function exportOne(task: ReportTask) {
    try {
      const blob = await adminApi.exportSingleReportMaterial({
        reportType: task.reportType,
        signatureId: task.signatureId,
        channelId: task.channelId,
        carrier: task.carrier ?? undefined,
        drainageItemId: task.drainageItemId ?? undefined,
        batchItemId: task.exportItems?.[0]?.batchItem.id,
      });
      const url = URL.createObjectURL(blob);
      const anchor = document.createElement('a');
      anchor.href = url;
      anchor.download = `${task.signature?.name ?? '签名'}-${task.channel?.name ?? '通道'}.xlsx`;
      anchor.click();
      URL.revokeObjectURL(url);
    } catch (failure) {
      setError(failure instanceof Error ? failure.message : '单条资料导出失败');
    }
  }

  const columns: Array<TableColumn<ReportMaterialBatch>> = [
    { key: 'batchNo', title: '报备批次号', render: (item) => <strong>{item.batchNo}</strong> },
    { key: 'time', title: '生成时间', render: (item) => formatDateTime(item.createdAt) },
    { key: 'count', title: '明细进度', render: (item) => `${item.successCount}/${item.reportTotal}` },
    { key: 'channels', title: '通道/文件', render: (item) => `${item.channelCount}个通道 · ${item.fileCount}份文件` },
    {
      key: 'status',
      title: '生成状态',
      render: (item) => (
        <Tag tone={item.status === 'completed' ? 'success' : item.status === 'failed' ? 'danger' : 'warning'}>
          {statusLabels[item.status] ?? item.status}
        </Tag>
      ),
    },
    {
      key: 'files',
      title: '文件',
      render: (item) => (
        <div className="table-actions">
          {item.exportFiles.map((file) =>
            file.fileObjectId ? (
              <a href={fileDownloadUrl(file.fileObjectId)} key={file.id}>
                <Download size={14} />
                {file.fileName}
              </a>
            ) : null,
          )}
        </div>
      ),
    },
    {
      key: 'actions',
      title: '操作',
      align: 'right',
      render: (item) => (
        <Button icon={<Eye size={14} />} onClick={() => void openBatch(item)} size="sm" variant="ghost">
          打开明细
        </Button>
      ),
    },
  ];
  const taskColumns: Array<TableColumn<ReportTask>> = [
    {
      key: 'select',
      title: '',
      width: '44px',
      render: (task) => (
        <input
          aria-label={`选择${task.signature?.name ?? task.id}`}
          checked={selected.has(task.id)}
          onChange={() =>
            setSelected((current) => {
              const next = new Set(current);
              if (next.has(task.id)) next.delete(task.id);
              else next.add(task.id);
              return next;
            })
          }
          type="checkbox"
        />
      ),
    },
    {
      key: 'target',
      title: '企业/应用/签名',
      render: (task) => (
        <div>
          <strong>{task.signature?.name ?? '-'}</strong>
          <div className="muted">
            {task.signature?.tenant?.name ?? '-'} · {task.signature?.application?.name ?? '-'}
          </div>
        </div>
      ),
    },
    {
      key: 'channel',
      title: '通道/运营商',
      render: (task) => (
        <div>
          {task.channel?.name ?? '-'}
          {task.carrier ? (
            <div>
              <CarrierTag carrier={task.carrier} />
            </div>
          ) : null}
        </div>
      ),
    },
    {
      key: 'version',
      title: '资料版本',
      render: (task) => `V${task.exportItems?.[0]?.batchItem.materialVersion ?? '-'}`,
    },
    {
      key: 'status',
      title: '报备状态',
      render: (task) => (
        <Tag
          tone={
            task.status === 'approved'
              ? 'success'
              : task.status === 'failed' || task.status === 'rejected'
                ? 'danger'
                : 'warning'
          }
        >
          {statusLabels[task.status] ?? task.status}
        </Tag>
      ),
    },
    {
      key: 'actions',
      title: '操作',
      align: 'right',
      render: (task) =>
        task.reportType !== 'drainage' ? (
          <Button icon={<Download size={14} />} onClick={() => void exportOne(task)} size="sm" variant="ghost">
            导出本条
          </Button>
        ) : (
          '-'
        ),
    },
  ];

  return (
    <section className="page-stack report-batch-page">
      <div className="page-heading">
        <div>
          <Breadcrumb items={['报备工作台', '报备批次']} />
          <h1>报备批次</h1>
          <p>查看已生成批次、下载通道文件，并在批次内批量处理通道报备明细。</p>
        </div>
      </div>
      {error ? <p className="form-error">{error}</p> : null}
      <div className="surface admin-task-filter">
        <Input label="报备批次号" onChange={(event) => setKeyword(event.target.value)} value={keyword} />
        <DateRangeInput label="生成时间" onChange={setDateRange} value={dateRange} />
        <div className="admin-task-filter__actions">
          <Button
            icon={<Search size={16} />}
            onClick={() => {
              if (page !== 1) setPage(1);
              else load(1);
            }}
          >
            查询
          </Button>
          <Button
            onClick={() => {
              setKeyword('');
              setDateRange({});
            }}
            variant="ghost"
          >
            重置
          </Button>
        </div>
      </div>
      <div className="surface">
        <Table columns={columns} data={items} emptyText="尚未生成报备批次" pagination={false} rowKey="id" />
      </div>
      <Pagination
        nextDisabled={page * pageSize >= total}
        onNext={() => setPage((value) => value + 1)}
        onPageChange={setPage}
        onPrevious={() => setPage((value) => Math.max(1, value - 1))}
        page={page}
        previousDisabled={page <= 1}
        total={total}
        totalPages={Math.max(1, Math.ceil(total / pageSize))}
      />
      {detail ? (
        <Modal
          footer={<Button onClick={() => setDetail(undefined)}>关闭</Button>}
          onClose={() => setDetail(undefined)}
          open
          size="xl"
          title={`批次明细 · ${detail.batchNo}`}
        >
          <div className="page-stack">
            <div className="report-batch-toolbar">
              <strong>
                共 {tasks.length} 条通道明细，已选 {selected.size} 条
              </strong>
              <Select
                aria-label="批量修改状态"
                onChange={(event) => setNextStatus(event.target.value)}
                options={[
                  { label: '未报备', value: 'pending' },
                  { label: '资料待补充', value: 'waiting_material' },
                  { label: '报备中', value: 'reporting' },
                  { label: '报备通过', value: 'approved' },
                  { label: '报备失败', value: 'failed' },
                  { label: '放弃报备', value: 'abandoned' },
                ]}
                value={nextStatus}
              />
              <Textarea
                aria-label="修改原因"
                onChange={(event) => setReason(event.target.value)}
                placeholder="修改原因"
                rows={2}
                value={reason}
              />
              <Button disabled={!selected.size} onClick={() => void saveStatuses()}>
                批量修改
              </Button>
            </div>
            <Table columns={taskColumns} data={tasks} emptyText="该批次暂无明细" pagination={false} rowKey="id" />
          </div>
        </Modal>
      ) : null}
    </section>
  );
}