"use client"

import * as React from "react"
import {
  useReactTable,
  getCoreRowModel,
  getSortedRowModel,
  getFilteredRowModel,
  type SortingState,
  type ColumnFiltersState,
  flexRender,
  type Column,
} from "@tanstack/react-table"
import { useVirtualizer } from "@tanstack/react-virtual"
import { toast } from "sonner"
import { ChevronDown, ChevronUp, Search, Download } from "lucide-react"

import { Button } from "@/components/ui/button"
import { Input } from "@/components/ui/input"
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select"
import { BackButton } from "@/components/ui/back-button"
import { virtualColumns } from "./avl-detail-virtual-columns"
import type { AvlDetailItem } from "../types"
import { exportTableToExcel } from "@/lib/export_all"

interface AvlDetailVirtualTableProps {
  data: AvlDetailItem[]
  avlListId: number
  avlType?: '프로젝트AVL' | '선종별표준AVL' | string
  projectInfo?: {
    code?: string
    pspid?: string
    OWN_NM?: string
    kunnrNm?: string
  }
  shipOwnerName?: string
  businessType?: string
}

function Filter({ column }: { column: Column<any, unknown> }) {
  const columnFilterValue = column.getFilterValue()
  const id = column.id

  // Boolean 필터 (faTarget, shiBlacklist, shiBcc)
  if (id === 'faTarget' || id === 'shiBlacklist' || id === 'shiBcc' || id === 'shiAvl') {
    return (
      <div onClick={(e) => e.stopPropagation()} className="mt-2">
        <Select
          value={(columnFilterValue as string) ?? "all"}
          onValueChange={(value) => column.setFilterValue(value === "all" ? undefined : value === "true")}
        >
          <SelectTrigger className="h-8 w-full">
            <SelectValue placeholder="All" />
          </SelectTrigger>
          <SelectContent>
            <SelectItem value="all">All</SelectItem>
            <SelectItem value="true">Yes</SelectItem>
            <SelectItem value="false">No</SelectItem>
          </SelectContent>
        </Select>
      </div>
    )
  }

  // FA Status 필터 (O 또는 빈 값 - 데이터에 따라 조정 필요)
  if (id === 'faStatus') {
    return (
      <div onClick={(e) => e.stopPropagation()} className="mt-2">
        <Select
          value={(columnFilterValue as string) ?? "all"}
          onValueChange={(value) => column.setFilterValue(value === "all" ? undefined : value)}
        >
          <SelectTrigger className="h-8 w-full">
            <SelectValue placeholder="All" />
          </SelectTrigger>
          <SelectContent>
            <SelectItem value="all">All</SelectItem>
            <SelectItem value="O">YES</SelectItem>
            <SelectItem value="X">NO</SelectItem>
          </SelectContent>
        </Select>
      </div>
    )
  }

  // 일반 텍스트 검색
  return (
    <div onClick={(e) => e.stopPropagation()} className="mt-2">
      <Input
        type="text"
        value={(columnFilterValue ?? '') as string}
        onChange={(e) => column.setFilterValue(e.target.value)}
        placeholder="Search..."
        className="h-8 w-full font-normal bg-background"
      />
    </div>
  )
}

export function AvlDetailVirtualTable({
  data,
  avlType,
  projectInfo,
  businessType,
}: AvlDetailVirtualTableProps) {
  // 상태 관리
  const [sorting, setSorting] = React.useState<SortingState>([])
  const [columnFilters, setColumnFilters] = React.useState<ColumnFiltersState>([])
  const [globalFilter, setGlobalFilter] = React.useState("")

  // 액션 핸들러
  const handleAction = React.useCallback(async (action: string) => {
    try {
      switch (action) {
        case 'vendor-pool':
          window.open('/evcp/vendor-pool', '_blank')
          break

        case 'excel-export':
          try {
            toast.info("엑셀 파일을 생성 중입니다...")
            await exportTableToExcel(table, {
              filename: `AVL_상세내역_${new Date().toISOString().split('T')[0]}`,
              allPages: true,
              excludeColumns: ["select", "actions"],
              useGroupHeader: true,
            })
            toast.success('Excel 파일이 다운로드되었습니다.')
          } catch (error) {
            console.error('Excel export 실패:', error)
            toast.error('Excel 내보내기에 실패했습니다.')
          }
          break

        default:
          console.log('알 수 없는 액션:', action)
          toast.error('알 수 없는 액션입니다.')
      }
    } catch (error) {
      console.error('액션 처리 실패:', error)
      toast.error('액션 처리 중 오류가 발생했습니다.')
    }
  }, [])

  // TanStack Table 설정
  const table = useReactTable({
    data,
    columns: virtualColumns,
    state: {
      sorting,
      columnFilters,
      globalFilter,
    },
    onSortingChange: setSorting,
    onColumnFiltersChange: setColumnFilters,
    onGlobalFilterChange: setGlobalFilter,
    columnResizeMode: "onChange",
    getCoreRowModel: getCoreRowModel(),
    getSortedRowModel: getSortedRowModel(),
    getFilteredRowModel: getFilteredRowModel(),
    getRowId: (originalRow) => String(originalRow.id),
  })

  // Virtual Scrolling 설정
  const tableContainerRef = React.useRef<HTMLDivElement>(null)

  const { rows } = table.getRowModel()

  const rowVirtualizer = useVirtualizer({
    count: rows.length,
    getScrollElement: () => tableContainerRef.current,
    estimateSize: () => 50, // 행 높이 추정값
    overscan: 10, // 화면 밖 렌더링할 행 수
  })

  const virtualRows = rowVirtualizer.getVirtualItems()
  const totalSize = rowVirtualizer.getTotalSize()

  const paddingTop = virtualRows.length > 0 ? virtualRows?.[0]?.start || 0 : 0
  const paddingBottom = virtualRows.length > 0
    ? totalSize - (virtualRows?.[virtualRows.length - 1]?.end || 0)
    : 0

  return (
    <div className="flex flex-col h-full space-y-4">
      {/* 상단 정보 표시 영역 */}
      <div className="flex items-center justify-between p-4 border rounded-md bg-background">
        <div className="flex items-center gap-4">
          <h2 className="text-lg font-semibold">AVL 상세내역</h2>
          <span className="px-3 py-1 bg-secondary-foreground text-secondary-foreground-foreground rounded-full text-sm font-medium">
            {avlType}
          </span>
          
          <span className="text-sm text-muted-foreground">
            [{businessType}] {projectInfo?.code || projectInfo?.pspid || '코드정보없음(표준AVL)'} ({projectInfo?.OWN_NM || projectInfo?.kunnrNm || '선주정보 없음'})
          </span>
        </div>

        <div className="justify-end">
          <BackButton>목록으로</BackButton>
        </div>
      </div>

      {/* 툴바 */}
      <div className="flex items-center justify-between gap-4">
        <div className="flex items-center gap-2 flex-1">
          <div className="relative flex-1 max-w-sm">
            <Search className="absolute left-2 top-1/2 h-4 w-4 -translate-y-1/2 text-muted-foreground" />
            <Input
              placeholder="전체 검색..."
              value={globalFilter ?? ""}
              onChange={(e) => setGlobalFilter(e.target.value)}
              className="pl-8"
            />
          </div>
          <div className="text-sm text-muted-foreground">
            전체 {data.length}건 중 {rows.length}건 표시
          </div>
        </div>

        <div className="flex items-center gap-2">
          <Button
            onClick={() => handleAction('vendor-pool')}
            variant="outline"
            size="sm"
          >
            Vendor Pool
          </Button>

          <Button
            onClick={() => handleAction('excel-export')}
            variant="outline"
            size="sm"
          >
            <Download className="mr-2 h-4 w-4" />
            Excel Export
          </Button>
        </div>
      </div>

      {/* 테이블 */}
      <div
        ref={tableContainerRef}
        className="relative flex-1 overflow-auto border rounded-md"
      >
        <table
          className="table-fixed border-collapse"
          style={{ width: table.getTotalSize() }}
        >
          {/* GroupHeader를 사용할 때 table-layout: fixed에서 열 너비가 올바르게 적용되도록 colgroup 추가 */}
          <colgroup>
            {table.getLeafHeaders().map((header) => (
              <col key={header.id} style={{ width: header.getSize() }} />
            ))}
          </colgroup>
          <thead className="sticky top-0 z-10 bg-muted">
            {table.getHeaderGroups().map((headerGroup) => (
              <tr key={headerGroup.id}>
                {headerGroup.headers.map((header) => (
                  <th
                    key={header.id}
                    colSpan={header.colSpan}
                    className="border-b px-4 py-2 text-left text-sm font-medium relative group"
                    style={{ width: header.getSize() }}
                  >
                    {header.isPlaceholder ? null : (
                      <>
                        <div
                          className={
                            header.column.getCanSort()
                            ? "flex items-center gap-2 cursor-pointer select-none"
                            : ""
                          }
                          onClick={header.column.getToggleSortingHandler()}
                        >
                          {flexRender(
                            header.column.columnDef.header,
                            header.getContext()
                          )}
                          {header.column.getCanSort() && (
                            <div className="flex flex-col">
                              {header.column.getIsSorted() === "asc" ? (
                                <ChevronUp className="h-4 w-4" />
                              ) : header.column.getIsSorted() === "desc" ? (
                                <ChevronDown className="h-4 w-4" />
                              ) : (
                                <div className="h-4 w-4" />
                              )}
                            </div>
                          )}
                        </div>
                        {header.column.getCanFilter() && (
                          <Filter column={header.column} />
                        )}
                        <div
                          onMouseDown={header.getResizeHandler()}
                          onTouchStart={header.getResizeHandler()}
                          className={`absolute right-0 top-0 h-full w-1 cursor-col-resize select-none touch-none hover:bg-primary/50 ${
                            header.column.getIsResizing() ? 'bg-primary' : 'bg-transparent'
                          }`}
                        />
                      </>
                    )}
                  </th>
                ))}
              </tr>
            ))}
          </thead>
          <tbody>
            {paddingTop > 0 && (
              <tr>
                <td style={{ height: `${paddingTop}px` }} />
              </tr>
            )}
            {virtualRows.map((virtualRow) => {
              const row = rows[virtualRow.index]
              
              return (
                <tr
                  key={row.id}
                  data-index={virtualRow.index}
                  ref={rowVirtualizer.measureElement}
                  data-row-id={row.id}
                  className="hover:bg-muted/50"
                >
                  {row.getVisibleCells().map((cell) => (
                    <td
                      key={cell.id}
                      className="border-b px-4 py-2 text-sm whitespace-normal break-words"
                      style={{ width: cell.column.getSize() }}
                    >
                      {flexRender(
                        cell.column.columnDef.cell,
                        cell.getContext()
                      )}
                    </td>
                  ))}
                </tr>
              )
            })}
            {paddingBottom > 0 && (
              <tr>
                <td style={{ height: `${paddingBottom}px` }} />
              </tr>
            )}
          </tbody>
        </table>
      </div>
    </div>
  )
}