"use client";

/**
 * 게이지 서브타입 컴포넌트
 *
 * SVG 기반 반원형 게이지 (외부 라이브러리 불필요)
 * min/max/target/current 표시, 달성률 구간별 색상
 */

import React from "react";
import type { DashboardItem } from "../../types";
import { abbreviateNumber } from "../utils/formula";

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

export interface GaugeItemProps {
  item: DashboardItem;
  data: number | null;
  /** 동적 목표값 (targetDataSource로 조회된 값) */
  targetValue?: number | null;
}

// ===== 게이지 색상 판정 =====

function getGaugeColor(
  percentage: number,
  ranges?: { min: number; max: number; color: string }[]
): string {
  if (ranges?.length) {
    const match = ranges.find((r) => percentage >= r.min && percentage <= r.max);
    if (match) return match.color;
  }
  // 기본 색상 (달성률 기준)
  if (percentage >= 80) return "#10b981"; // emerald
  if (percentage >= 50) return "#f59e0b"; // amber
  return "#ef4444"; // rose
}

// ===== 메인 컴포넌트 =====

export function GaugeItemComponent({
  item,
  data,
  targetValue,
}: GaugeItemProps) {
  const { visibility, gaugeConfig } = item;
  const current = data ?? 0;
  const min = gaugeConfig?.min ?? 0;
  const max = gaugeConfig?.max ?? 100;
  const target = targetValue ?? gaugeConfig?.target ?? max;

  // 달성률 계산 (0~100)
  const range = max - min;
  const percentage = range > 0 ? Math.min(100, Math.max(0, ((current - min) / range) * 100)) : 0;
  const gaugeColor = getGaugeColor(percentage, gaugeConfig?.colorRanges);

  // SVG 반원 게이지 수치
  const cx = 100;
  const cy = 90;
  const radius = 70;
  // 반원: 180도 -> percentage에 비례한 각도
  const startAngle = Math.PI; // 180도 (왼쪽)
  const endAngle = Math.PI - (percentage / 100) * Math.PI; // 0도 (오른쪽) 방향

  const startX = cx + radius * Math.cos(startAngle);
  const startY = cy - radius * Math.sin(startAngle);
  const endX = cx + radius * Math.cos(endAngle);
  const endY = cy - radius * Math.sin(endAngle);
  const largeArcFlag = percentage > 50 ? 1 : 0;

  return (
    <div className="@container flex h-full w-full flex-col items-center justify-center p-2">
      {/* 라벨 */}
      {visibility.showLabel && (
        <p className="shrink-0 truncate text-xs text-muted-foreground @[250px]:text-sm">
          {item.label}
        </p>
      )}

      {/* 게이지 SVG - 높이/너비 모두 반응형 */}
      <div className="flex min-h-0 flex-1 items-center justify-center w-full">
        <svg
          viewBox="0 0 200 110"
          className="h-full w-auto max-w-full"
          preserveAspectRatio="xMidYMid meet"
        >
          {/* 배경 반원 (회색) */}
          <path
            d={`M ${cx - radius} ${cy} A ${radius} ${radius} 0 0 1 ${cx + radius} ${cy}`}
            fill="none"
            stroke="#e5e7eb"
            strokeWidth="12"
            strokeLinecap="round"
          />

          {/* 값 반원 (색상) */}
          {percentage > 0 && (
            <path
              d={`M ${startX} ${startY} A ${radius} ${radius} 0 ${largeArcFlag} 1 ${endX} ${endY}`}
              fill="none"
              stroke={gaugeColor}
              strokeWidth="12"
              strokeLinecap="round"
            />
          )}

          {/* 중앙 텍스트 */}
          {visibility.showValue && (
            <text
              x={cx}
              y={cy - 10}
              textAnchor="middle"
              className="fill-foreground text-2xl font-bold"
              fontSize="24"
            >
              {abbreviateNumber(current)}
            </text>
          )}

          {/* 퍼센트 */}
          <text
            x={cx}
            y={cy + 10}
            textAnchor="middle"
            className="fill-muted-foreground text-xs"
            fontSize="12"
          >
            {percentage.toFixed(1)}%
          </text>
        </svg>
      </div>

      {/* 목표값 */}
      {visibility.showTarget && (
        <p className="shrink-0 text-xs text-muted-foreground">
          목표: {abbreviateNumber(target)}
        </p>
      )}
    </div>
  );
}