'use client';

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

interface MonthlyViewProps {
  data: IncomeStatementMonthlyData;
  selectedMonth: string | null; // null = 전체
  unitLabel: string;
}

export function MonthlyView({ data, selectedMonth, unitLabel }: MonthlyViewProps) {
  const { months, fiscalLabel } = data;

  if (selectedMonth) {
    // 개별 월 보기
    const monthData = months.find((m) => m.month === selectedMonth);
    if (!monthData) {
      return <div className="text-center py-8 text-muted-foreground text-sm">해당 월 데이터가 없습니다.</div>;
    }
    return (
      <SingleMonthView
        sections={monthData.sections}
        monthLabel={monthData.label}
        fiscalLabel={fiscalLabel}
        unitLabel={unitLabel}
      />
    );
  }

  // 전체 월 비교 보기 (가로 스크롤)
  return (
    <AllMonthsView
      months={months}
      fiscalLabel={fiscalLabel}
      unitLabel={unitLabel}
    />
  );
}

// 개별 월 보기 — PeriodView와 동일한 2열(금액+소계) 구조
function SingleMonthView({
  sections,
  monthLabel,
  fiscalLabel,
  unitLabel,
}: {
  sections: IncomeStatementSection[];
  monthLabel: string;
  fiscalLabel: string;
  unitLabel: string;
}) {
  return (
    <div className="space-y-1">
      <div className="rounded-md border overflow-x-auto">
        <Table>
          <TableHeader>
            <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"
              >
                {fiscalLabel} {monthLabel}
              </TableHead>
            </TableRow>
            <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>
            </TableRow>
          </TableHeader>
          <TableBody>
            {sections.map((section) => {
              const isHighlight = HIGHLIGHT_CODES.includes(section.code);
              const highlightClass = isHighlight ? 'bg-green-50' : '';

              // 계산 항목 또는 세부과목 없는 항목
              if (section.items.length === 0) {
                return (
                  <TableRow key={section.code} className={highlightClass}>
                    <TableCell className="text-xs md:text-sm font-semibold">
                      {section.code}. {section.name}
                    </TableCell>
                    <TableCell />
                    <TableCell className={`text-right text-xs md:text-sm whitespace-nowrap ${isHighlight ? 'font-bold' : 'font-semibold'}`}>
                      {section.currentAmount !== 0 ? formatNumber(section.currentAmount) : ''}
                    </TableCell>
                  </TableRow>
                );
              }

              // 세부과목 있는 항목
              const lastIdx = section.items.length - 1;
              return (
                <SingleMonthSectionRows
                  key={section.code}
                  section={section}
                  lastIdx={lastIdx}
                />
              );
            })}
          </TableBody>
        </Table>
      </div>
      <div className="text-xs text-muted-foreground text-right px-1">
        (단위: {unitLabel})
      </div>
    </div>
  );
}

function SingleMonthSectionRows({
  section,
  lastIdx,
}: {
  section: IncomeStatementSection;
  lastIdx: number;
}) {
  return (
    <>
      <TableRow>
        <TableCell className="text-xs md:text-sm font-semibold">
          {section.code}. {section.name}
        </TableCell>
        <TableCell />
        <TableCell />
      </TableRow>
      {section.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>
            <TableCell className="text-right text-xs md:text-sm whitespace-nowrap">
              {item.current !== 0 ? formatNumber(item.current) : ''}
            </TableCell>
            <TableCell className="text-right text-xs md:text-sm whitespace-nowrap font-semibold">
              {isLast ? formatNumber(section.currentAmount) : ''}
            </TableCell>
          </TableRow>
        );
      })}
    </>
  );
}

// 전체 월 비교 보기 (가로 스크롤, 과목 열 sticky)
function AllMonthsView({
  months,
  fiscalLabel,
  unitLabel,
}: {
  months: IncomeStatementMonthlyData['months'];
  fiscalLabel: string;
  unitLabel: string;
}) {
  const baseSections = months[0]?.sections || [];

  const rows: {
    type: 'section' | 'item';
    code: string;
    name: string;
    sectionCode: string;
    isHighlight: boolean;
  }[] = [];

  baseSections.forEach((section) => {
    const isHighlight = HIGHLIGHT_CODES.includes(section.code);
    rows.push({
      type: 'section',
      code: section.code,
      name: `${section.code}. ${section.name}`,
      sectionCode: section.code,
      isHighlight,
    });
    section.items.forEach((item) => {
      rows.push({
        type: 'item',
        code: item.code,
        name: item.name,
        sectionCode: section.code,
        isHighlight: false,
      });
    });
  });

  const monthMaps = months.map((m) => {
    const sectionMap = new Map<string, number>();
    const itemMap = new Map<string, number>();
    m.sections.forEach((s) => {
      sectionMap.set(s.code, s.currentAmount);
      s.items.forEach((it) => {
        itemMap.set(`${s.code}-${it.code}`, it.current);
      });
    });
    return { sectionMap, itemMap };
  });

  return (
    <div className="space-y-1">
      <div className="rounded-md border overflow-x-auto">
        <div style={{ minWidth: `${200 + months.length * 120}px` }}>
          <Table>
            <TableHeader>
              <TableRow>
                <TableHead
                  className="font-semibold text-xs md:text-sm sticky left-0 z-20 bg-background min-w-[200px]"
                  style={{ boxShadow: '2px 0 4px -2px rgba(0,0,0,0.1)' }}
                >
                  과목
                </TableHead>
                {months.map((m) => (
                  <TableHead
                    key={m.month}
                    className="font-semibold text-right text-xs md:text-sm min-w-[110px] whitespace-nowrap"
                  >
                    {m.label}
                  </TableHead>
                ))}
              </TableRow>
            </TableHeader>
            <TableBody>
              {rows.map((row) => {
                const isSection = row.type === 'section';
                const highlightClass = row.isHighlight ? 'bg-green-50' : '';
                const sectionBg = isSection && !row.isHighlight ? 'bg-muted/30' : '';

                return (
                  <TableRow
                    key={`${row.sectionCode}-${row.code}`}
                    className={`${highlightClass} ${sectionBg}`.trim() || undefined}
                  >
                    <TableCell
                      className={`text-xs md:text-sm sticky left-0 z-10 bg-inherit ${
                        isSection ? 'font-semibold' : 'pl-8 text-muted-foreground'
                      }`}
                      style={{ boxShadow: '2px 0 4px -2px rgba(0,0,0,0.1)' }}
                    >
                      {row.name}
                    </TableCell>
                    {months.map((m, mi) => {
                      const amount = isSection
                        ? monthMaps[mi].sectionMap.get(row.sectionCode) ?? 0
                        : monthMaps[mi].itemMap.get(`${row.sectionCode}-${row.code}`) ?? 0;
                      return (
                        <TableCell
                          key={m.month}
                          className={`text-right text-xs md:text-sm whitespace-nowrap ${
                            isSection ? 'font-semibold' : ''
                          }`}
                        >
                          {formatNumber(amount)}
                        </TableCell>
                      );
                    })}
                  </TableRow>
                );
              })}
            </TableBody>
          </Table>
        </div>
      </div>
      <div className="text-xs text-muted-foreground text-right px-1">
        (단위: {unitLabel})
      </div>
    </div>
  );
}
