'use client';

import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from '@/components/ui/table';
import { formatNumber } from '@/lib/utils/amount';
import type { IncomeStatementData } from './types';
import { HIGHLIGHT_CODES } from './types';

interface PeriodViewProps {
  data: IncomeStatementData;
  showPrevious: boolean;
  unitLabel: string;
}

export function PeriodView({ data, showPrevious, unitLabel }: PeriodViewProps) {
  const { period, sections } = data;
  const colSpan = showPrevious ? 5 : 3; // 과목 + (금액+소계) * 기수

  return (
    <div className="space-y-1">
      <div className="rounded-md border overflow-x-auto">
        <div className="min-w-[400px]">
          <Table>
            <TableHeader>
              {/* 1행: 과목 + 기수 헤더 (녹색 배경) */}
              <TableRow className="bg-green-700 hover:bg-green-700">
                <TableHead
                  rowSpan={2}
                  className="font-semibold text-xs md:text-sm text-white w-[40%] border-r border-green-600"
                >
                  과 목
                </TableHead>
                <TableHead
                  colSpan={2}
                  className="font-semibold text-center text-xs md:text-sm text-white border-b border-green-600"
                >
                  {period.current.label}
                </TableHead>
                {showPrevious && (
                  <TableHead
                    colSpan={2}
                    className="font-semibold text-center text-xs md:text-sm text-white border-b border-green-600 border-l border-green-600"
                  >
                    {period.previous.label}
                  </TableHead>
                )}
              </TableRow>
              {/* 2행: 금 액 서브헤더 */}
              <TableRow className="bg-green-700 hover:bg-green-700">
                <TableHead
                  colSpan={2}
                  className="font-semibold text-center text-xs md:text-sm text-white"
                >
                  금 액
                </TableHead>
                {showPrevious && (
                  <TableHead
                    colSpan={2}
                    className="font-semibold text-center text-xs md:text-sm text-white border-l border-green-600"
                  >
                    금 액
                  </TableHead>
                )}
              </TableRow>
            </TableHeader>
            <TableBody>
              {sections.map((section) => {
                const isHighlight = HIGHLIGHT_CODES.includes(section.code);
                const hasItems = section.items.length > 0;

                return (
                  <SectionRows
                    key={section.code}
                    code={section.code}
                    name={section.name}
                    currentAmount={section.currentAmount}
                    previousAmount={section.previousAmount}
                    items={section.items}
                    isHighlight={isHighlight}
                    hasItems={hasItems}
                    showPrevious={showPrevious}
                  />
                );
              })}
            </TableBody>
          </Table>
        </div>
      </div>
      {/* 하단 단위 표기 */}
      <div className="text-xs text-muted-foreground text-right px-1">
        (단위: {unitLabel})
      </div>
    </div>
  );
}

interface SectionRowsProps {
  code: string;
  name: string;
  currentAmount: number;
  previousAmount: number;
  items: { code: string; name: string; current: number; previous: number }[];
  isHighlight: boolean;
  hasItems: boolean;
  showPrevious: boolean;
}

function SectionRows({
  code,
  name,
  currentAmount,
  previousAmount,
  items,
  isHighlight,
  hasItems,
  showPrevious,
}: SectionRowsProps) {
  const highlightClass = isHighlight ? 'bg-green-50' : '';

  // 계산 항목 (III, V, VIII, X 등) — 소계열에만 금액 표시
  if (!hasItems && isHighlight) {
    return (
      <TableRow className={highlightClass}>
        <TableCell className="text-xs md:text-sm font-semibold">
          {code}. {name}
        </TableCell>
        <TableCell />
        <TableCell className="text-right text-xs md:text-sm font-bold whitespace-nowrap">
          {formatNumber(currentAmount)}
        </TableCell>
        {showPrevious && (
          <>
            <TableCell />
            <TableCell className="text-right text-xs md:text-sm font-bold whitespace-nowrap">
              {formatNumber(previousAmount)}
            </TableCell>
          </>
        )}
      </TableRow>
    );
  }

  // 세부과목 없는 합계 항목 (VIII 등) — 소계열에만 금액
  if (!hasItems) {
    return (
      <TableRow className={highlightClass}>
        <TableCell className="text-xs md:text-sm font-semibold">
          {code}. {name}
        </TableCell>
        <TableCell />
        <TableCell className="text-right text-xs md:text-sm font-semibold whitespace-nowrap">
          {currentAmount !== 0 ? formatNumber(currentAmount) : ''}
        </TableCell>
        {showPrevious && (
          <>
            <TableCell />
            <TableCell className="text-right text-xs md:text-sm font-semibold whitespace-nowrap">
              {previousAmount !== 0 ? formatNumber(previousAmount) : ''}
            </TableCell>
          </>
        )}
      </TableRow>
    );
  }

  // 세부 과목이 있는 항목 (I, II, IV, VI, VII, IX)
  const lastIdx = items.length - 1;

  return (
    <>
      {/* 섹션 헤더 — 금액 표시 안 함 */}
      <TableRow>
        <TableCell className="text-xs md:text-sm font-semibold">
          {code}. {name}
        </TableCell>
        <TableCell />
        <TableCell />
        {showPrevious && (
          <>
            <TableCell />
            <TableCell />
          </>
        )}
      </TableRow>
      {/* 세부 과목 행 — 들여쓰기 */}
      {items.map((item, idx) => {
        const isLast = idx === lastIdx;
        return (
          <TableRow key={item.code}>
            <TableCell className="text-xs md:text-sm pl-8 text-muted-foreground">
              {item.name}
            </TableCell>
            {/* 금액 열 */}
            <TableCell className="text-right text-xs md:text-sm whitespace-nowrap">
              {item.current !== 0 ? formatNumber(item.current) : ''}
            </TableCell>
            {/* 소계 열 — 마지막 세부항목에만 섹션 합계 표시 */}
            <TableCell className="text-right text-xs md:text-sm whitespace-nowrap font-semibold">
              {isLast ? formatNumber(currentAmount) : ''}
            </TableCell>
            {showPrevious && (
              <>
                <TableCell className="text-right text-xs md:text-sm whitespace-nowrap">
                  {item.previous !== 0 ? formatNumber(item.previous) : ''}
                </TableCell>
                <TableCell className="text-right text-xs md:text-sm whitespace-nowrap font-semibold">
                  {isLast ? formatNumber(previousAmount) : ''}
                </TableCell>
              </>
            )}
          </TableRow>
        );
      })}
    </>
  );
}