'use client';

import {
  Area,
  AreaChart,
  CartesianGrid,
  ResponsiveContainer,
  Tooltip,
  XAxis,
  YAxis,
} from 'recharts';
import {
  Card,
  CardContent,
  CardDescription,
  CardHeader,
  CardTitle,
} from '@/components/ui/card';
import { formatPrice } from '@/lib/currency';
import type { ValuationHistoryPoint } from '@/lib/valuation-api';

interface ValuationHistoryChartProps {
  data: ValuationHistoryPoint[];
}

function formatChartDate(dateStr: string): string {
  const date = new Date(dateStr);
  return date.toLocaleDateString('vi-VN', { month: 'short', year: '2-digit' });
}

function formatTooltipDate(dateStr: string): string {
  const date = new Date(dateStr);
  return date.toLocaleDateString('vi-VN', {
    day: '2-digit',
    month: '2-digit',
    year: 'numeric',
  });
}

export function ValuationHistoryChart({ data }: ValuationHistoryChartProps) {
  if (data.length < 2) return null;

  const chartData = data.map((point) => ({
    date: point.date,
    price: point.estimatedPriceVND,
    confidence: Math.round(point.confidence * 100),
  }));

  return (
    <Card>
      <CardHeader>
        <CardTitle className="text-lg">Lịch sử định giá</CardTitle>
        <CardDescription>
          Biến động giá ước tính theo thời gian
        </CardDescription>
      </CardHeader>
      <CardContent>
        <div className="h-64">
          <ResponsiveContainer width="100%" height="100%">
            <AreaChart data={chartData} margin={{ top: 5, right: 10, left: 10, bottom: 5 }}>
              <defs>
                <linearGradient id="priceGradient" x1="0" y1="0" x2="0" y2="1">
                  <stop offset="5%" stopColor="hsl(var(--primary))" stopOpacity={0.3} />
                  <stop offset="95%" stopColor="hsl(var(--primary))" stopOpacity={0} />
                </linearGradient>
              </defs>
              <CartesianGrid strokeDasharray="3 3" className="stroke-muted" />
              <XAxis
                dataKey="date"
                tickFormatter={formatChartDate}
                className="fill-muted-foreground"
                fontSize={12}
              />
              <YAxis
                tickFormatter={(val: number) => formatPrice(val)}
                className="fill-muted-foreground"
                fontSize={12}
                width={80}
              />
              <Tooltip
                contentStyle={{
                  backgroundColor: 'hsl(var(--card))',
                  border: '1px solid hsl(var(--border))',
                  borderRadius: '0.5rem',
                  fontSize: '0.875rem',
                }}
                labelFormatter={(label) =>
                  typeof label === 'string' ? formatTooltipDate(label) : label
                }
                formatter={(value, name) => {
                  const num = Number(value);
                  if (name === 'price') return [formatPrice(num) + ' VNĐ', 'Giá ước tính'];
                  if (name === 'confidence') return [`${num}%`, 'Độ tin cậy'];
                  return [String(value), name];
                }}
              />
              <Area
                type="monotone"
                dataKey="price"
                stroke="hsl(var(--primary))"
                strokeWidth={2}
                fill="url(#priceGradient)"
              />
            </AreaChart>
          </ResponsiveContainer>
        </div>
      </CardContent>
    </Card>
  );
}