"use client";

/**
 * 차트 서브타입 컴포넌트
 *
 * Recharts 기반 막대/원형/라인 차트
 * 컨테이너 크기가 너무 작으면 "차트 표시 불가" 메시지
 */

import React from "react";
import {
  BarChart,
  Bar,
  PieChart,
  Pie,
  Cell,
  LineChart,
  Line,
  XAxis,
  YAxis,
  Tooltip,
  Legend,
  ResponsiveContainer,
  CartesianGrid,
} from "recharts";
import type { DashboardItem } from "../../types";
import { TEXT_ALIGN_CLASSES } from "../../types";
import { abbreviateNumber } from "../utils/formula";

// ===== Props =====

export interface ChartItemProps {
  item: DashboardItem;
  /** 차트에 표시할 데이터 행 */
  rows: Record<string, unknown>[];
  /** 컨테이너 너비 (px) - 최소 크기 판단용 */
  containerWidth: number;
}

// ===== 기본 색상 팔레트 =====

const DEFAULT_COLORS = [
  "#6366f1", // indigo
  "#8b5cf6", // violet
  "#06b6d4", // cyan
  "#10b981", // emerald
  "#f59e0b", // amber
  "#ef4444", // rose
  "#ec4899", // pink
  "#14b8a6", // teal
];

// ===== 최소 표시 크기 =====

const MIN_CHART_WIDTH = 120;

// ===== 메인 컴포넌트 =====

export function ChartItemComponent({
  item,
  rows,
  containerWidth,
}: ChartItemProps) {
  const { chartConfig, visibility, itemStyle } = item;
  const chartType = chartConfig?.chartType ?? "bar";
  const colors = chartConfig?.colors?.length
    ? chartConfig.colors
    : DEFAULT_COLORS;
  const xKey = chartConfig?.xAxisColumn ?? "name";
  const yKey = chartConfig?.yAxisColumn ?? "value";

  // 라벨 정렬만 사용자 설정
  const labelAlignClass = TEXT_ALIGN_CLASSES[itemStyle?.labelAlign ?? "center"];

  // 컨테이너가 너무 작으면 메시지 표시
  if (containerWidth < MIN_CHART_WIDTH) {
    return (
      <div className="flex h-full w-full items-center justify-center p-1">
        <span className="text-[10px] text-muted-foreground">차트</span>
      </div>
    );
  }

  // 데이터 없음
  if (!rows.length) {
    return (
      <div className="flex h-full w-full items-center justify-center">
        <span className="text-xs text-muted-foreground">데이터 없음</span>
      </div>
    );
  }

  // X축 라벨이 긴지 판정 (7자 이상이면 대각선)
  const hasLongLabels = rows.some(
    (r) => String(r[xKey] ?? "").length > 7
  );
  const xAxisTickProps = hasLongLabels
    ? { fontSize: 10, angle: -45, textAnchor: "end" as const }
    : { fontSize: 10 };
  // 긴 라벨이 있으면 하단 여백 확보
  const chartMargin = hasLongLabels
    ? { top: 5, right: 10, bottom: 40, left: 10 }
    : { top: 5, right: 10, bottom: 5, left: 10 };

  return (
    <div className="@container flex h-full w-full flex-col p-2">
      {/* 라벨 - 사용자 정렬 적용 */}
      {visibility.showLabel && (
        <p className={`w-full mb-1 text-muted-foreground text-xs @[250px]:text-sm ${labelAlignClass}`}>
          {item.label}
        </p>
      )}

      {/* 차트 영역 */}
      <div className="min-h-0 flex-1">
        <ResponsiveContainer width="100%" height="100%">
          {chartType === "bar" ? (
            <BarChart data={rows as Record<string, string | number>[]} margin={chartMargin}>
              <CartesianGrid strokeDasharray="3 3" stroke="#e5e7eb" />
              <XAxis
                dataKey={xKey}
                tick={xAxisTickProps}
                hide={containerWidth < 200}
              />
              <YAxis
                tick={{ fontSize: 10 }}
                hide={containerWidth < 200}
                tickFormatter={(v: number) => abbreviateNumber(v)}
              />
              <Tooltip />
              <Bar dataKey={yKey} fill={colors[0]} radius={[2, 2, 0, 0]} />
            </BarChart>
          ) : chartType === "line" ? (
            <LineChart data={rows as Record<string, string | number>[]} margin={chartMargin}>
              <CartesianGrid strokeDasharray="3 3" stroke="#e5e7eb" />
              <XAxis
                dataKey={xKey}
                tick={xAxisTickProps}
                hide={containerWidth < 200}
              />
              <YAxis
                tick={{ fontSize: 10 }}
                hide={containerWidth < 200}
                tickFormatter={(v: number) => abbreviateNumber(v)}
              />
              <Tooltip />
              <Line
                type="monotone"
                dataKey={yKey}
                stroke={colors[0]}
                strokeWidth={2}
                dot={containerWidth > 250}
              />
            </LineChart>
          ) : (
            /* pie - 카테고리명 + 값 라벨 표시 */
            <PieChart>
              <Pie
                data={rows as Record<string, string | number>[]}
                dataKey={yKey}
                nameKey={xKey}
                cx="50%"
                cy="50%"
                outerRadius={containerWidth > 400 ? "70%" : "80%"}
                label={
                  containerWidth > 250
                    ? ({ name, value, percent }: { name: string; value: number; percent: number }) =>
                        `${name} ${abbreviateNumber(value)} (${(percent * 100).toFixed(0)}%)`
                    : false
                }
                labelLine={containerWidth > 250}
              >
                {rows.map((_, index) => (
                  <Cell
                    key={`cell-${index}`}
                    fill={colors[index % colors.length]}
                  />
                ))}
              </Pie>
              <Tooltip
                formatter={(value: number, name: string) => [abbreviateNumber(value), name]}
              />
              {containerWidth > 300 && (
                <Legend
                  wrapperStyle={{ fontSize: 11 }}
                  iconSize={10}
                />
              )}
            </PieChart>
          )}
        </ResponsiveContainer>
      </div>
    </div>
  );
}