'use client';

import React from 'react';
import styled from 'styled-components';
import { theme } from '@/styles/theme';

interface BarChartProps {
  data: Array<{ label: string; value: number; color?: string }>;
  maxValue?: number;
  unit?: string;
  title?: string;
}

const Wrapper = styled.div`
  width: 100%;
`;

const Title = styled.div`
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
`;

const ChartArea = styled.div`
  display: flex;
  align-items: flex-end;
  gap: 10px;
  height: 140px;
`;

const BarWrapper = styled.div`
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  height: 100%;
  justify-content: flex-end;
`;

const Bar = styled.div<{ $height: number; $color: string }>`
  width: 100%;
  height: ${({ $height }) => $height}%;
  min-height: 2px;
  background: ${({ $color }) => $color};
  border-radius: 4px 4px 0 0;
  transition: height 0.4s ease;
  position: relative;

  &:hover::after {
    content: attr(data-value);
    position: absolute;
    top: -24px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 11px;
    color: var(--text-primary);
    white-space: nowrap;
    background: rgba(22,27,34,0.95);
    padding: 2px 6px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
  }
`;

const Label = styled.div`
  font-size: 10px;
  color: var(--text-secondary);
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 60px;
`;

const Empty = styled.div`
  padding: 32px;
  text-align: center;
  color: var(--text-secondary);
  font-size: 13px;
`;

const COLORS = ['#58A6FF', '#00FF00', '#FF9800', '#E040FB', '#00BCD4'];

export default function BarChart({ data, maxValue, unit = '', title }: BarChartProps) {
  if (!data.length) return <Empty>데이터 없음</Empty>;

  const max = maxValue ?? Math.max(...data.map((d) => d.value), 1);

  return (
    <Wrapper>
      {title && <Title>{title}</Title>}
      <ChartArea>
        {data.map((item, i) => {
          const height = Math.max((item.value / max) * 100, item.value > 0 ? 2 : 0);
          const color = item.color ?? COLORS[i % COLORS.length];
          const displayValue = unit === '$'
            ? `$${item.value.toFixed(4)}`
            : `${item.value.toLocaleString()}${unit}`;
          return (
            <BarWrapper key={item.label}>
              <Bar $height={height} $color={color} data-value={displayValue} />
              <Label title={item.label}>{item.label}</Label>
            </BarWrapper>
          );
        })}
      </ChartArea>
    </Wrapper>
  );
}