import { useState } from 'react';
import { Plus, Upload, Download, FileSpreadsheet, ChevronDown, Trash2 } from 'lucide-react';
import { useOverlayRouter } from '@/lib/useOverlayRouter';
import { showToast } from '@/lib/notify';
import { confirm } from '@/lib/confirm';
import { PageContainer } from '@/components/layout/PageContainer';
import { PageToolbar, SearchInput } from '@/components/layout/PageToolbar';
import { Button } from '@/components/ui/button';
import { Badge } from '@/components/ui/badge';
import { useAuthStore, canManage } from '@/stores/auth';
import { DropdownMenu, DropdownMenuTrigger, DropdownMenuContent, DropdownMenuItem } from '@/components/ui/dropdown-menu';
import { useServerList } from '@/lib/useServerList';
import { usePartners } from '@/features/partners/hooks/usePartners';
import type { ListSuppliersParams } from '@/api/generated/model/listSuppliersParams';
import { PartnerTable } from '@/features/partners/components/PartnerTable';
import { PartnerFormSheet } from '@/features/partners/components/PartnerFormSheet';
import { ExcelUploadModal, downloadPartnerTemplate } from '@/features/partners/components/ExcelUploadModal';
import { type Partner } from '@/features/partners/types';

export default function PartnersPage() {
  // 검색/페이지 상태(재사용 훅) → 서버 쿼리 파라미터로 변환.
  const list = useServerList({ pageSize: 10 });
  const params: ListSuppliersParams = {
    search: list.debouncedSearch || undefined,
    page: list.page,
    size: list.pageSize,
  };

  const { partners, total, allPartners, createPartner, updatePartner, deletePartner, bulkCreate } =
    usePartners(params);
  const totalPages = list.totalPages(total);

  // 오버레이(폼/엑셀)를 쿼리스트링으로 → 딥링크·뒤로가기·새로고침 지원.
  // ?detail=<id> 직접 접근 시 데이터 로드 후 수정 폼이 자동으로 열린다.
  const overlay = useOverlayRouter(['new', 'detail', 'modal']);
  const editId = overlay.get('detail');
  const modal = overlay.get('modal'); // 'excel' | null
  const editing = editId ? allPartners.find((p) => p.supplier_id === editId) ?? null : null;
  const formMode: 'create' | 'edit' = editId ? 'edit' : 'create';
  const isFormOpen = overlay.has('new') || !!editing;

  // 협력사 삭제는 최고관리자 전용(단건 삭제와 동일 규칙) — 일괄삭제 버튼도 최고관리자에게만 노출.
  const isSuperAdmin = useAuthStore((st) => canManage(st.user?.role));
  const [selectedIds, setSelectedIds] = useState<string[]>([]);

  const handleBulkDelete = async () => {
    if (selectedIds.length === 0) return;
    if (!(await confirm({ title: '선택 협력사 일괄 삭제', description: `선택한 ${selectedIds.length}개 협력사를 명부에서 삭제하시겠습니까?`, confirmText: '삭제', destructive: true }))) return;
    let ok = 0;
    let fail = 0;
    for (const id of selectedIds) {
      try {
        await deletePartner(id);
        ok += 1;
      } catch {
        fail += 1;
      }
    }
    setSelectedIds([]);
    showToast(fail === 0 ? `${ok}개 협력사가 삭제되었습니다.` : `${ok}개 삭제 · ${fail}개 실패`, fail === 0 ? 'info' : 'error');
  };

  const openCreate = () => overlay.open('new');
  const openEdit = (part: Partner) => overlay.open('detail', part.supplier_id);

  const handleDeletePartner = async (id: string, partnerName: string) => {
    if (await confirm({ title: '협력사 삭제', description: `[${partnerName}] 파트너사를 협력사 목록에서 삭제하시겠습니까?`, confirmText: '삭제', destructive: true })) {
      try {
        await deletePartner(id);
        showToast('협력사 정보가 명부에서 제거되었습니다.', 'info');
      } catch (err) {
        showToast(err instanceof Error ? err.message : '협력사 삭제 실패', 'error');
      }
    }
  };

  return (
    <PageContainer>
      {/* 검색/액션 바 + 테이블을 한 카드로 붙인다(포털형). */}
      <div className="overflow-hidden rounded-lg border border-border bg-card">
      <PageToolbar
        className="rounded-none border-0 border-b border-border"
        actions={
          <>
            {isSuperAdmin && (
              <Button
                variant="outline"
                disabled={selectedIds.length === 0}
                onClick={handleBulkDelete}
                className="text-rose-600 hover:text-rose-700"
              >
                <Trash2 />
                선택 삭제
                {selectedIds.length > 0 && <Badge variant="destructive">{selectedIds.length}</Badge>}
              </Button>
            )}

            <DropdownMenu>
              <DropdownMenuTrigger render={<Button variant="outline" />}>
                <FileSpreadsheet />
                엑셀업로드
                <ChevronDown />
              </DropdownMenuTrigger>
              <DropdownMenuContent>
                <DropdownMenuItem onClick={() => overlay.open('modal', 'excel')}>
                  <Upload />
                  일괄 업로드
                </DropdownMenuItem>
                <DropdownMenuItem onClick={downloadPartnerTemplate}>
                  <Download />
                  양식 다운로드
                </DropdownMenuItem>
              </DropdownMenuContent>
            </DropdownMenu>

            <Button onClick={openCreate}>
              <Plus />
              신규 협력사 등록
            </Button>
          </>
        }
      >
        <SearchInput
          id="partner-search"
          value={list.search}
          onChange={(e) => list.setSearch(e.target.value)}
          onKeyDown={(e) => e.key === 'Enter' && list.submitSearch()}
          onClear={list.clearSearch}
          placeholder="협력사명, 코드 또는 담당자명으로 추적 검색..."
        />
      </PageToolbar>

      <PartnerTable
        className="rounded-none border-0"
        data={partners}
        selectedIds={isSuperAdmin ? selectedIds : undefined}
        onSelectionChange={isSuperAdmin ? setSelectedIds : undefined}
        onRowClick={openEdit}
        page={list.page}
        totalPages={totalPages}
        totalCount={total}
        pageSize={list.pageSize}
        onPageChange={list.setPage}
      />
      </div>

      {isFormOpen && (
        <PartnerFormSheet
          key={`${formMode}-${editing?.supplier_id ?? 'new'}`}
          open
          mode={formMode}
          partner={editing}
          onCreate={createPartner}
          onUpdate={updatePartner}
          onDelete={handleDeletePartner}
          onClose={overlay.close}
        />
      )}

      {modal === 'excel' && (
        <ExcelUploadModal
          open
          partners={allPartners}
          onConfirm={bulkCreate}
          onClose={overlay.close}
        />
      )}
    </PageContainer>
  );
}