// LogHistogram.tsx — Log Volume 时间分布面积图 // Logan.Li
import { useMemo } from 'react';
import { AreaChart, Area, XAxis, YAxis, CartesianGrid, Tooltip, ResponsiveContainer } from 'recharts';
import type { LogEngine } from './types-v3';

interface LogHistogramProps {
  data: { timestamp: string; count: number }[];
  engine: LogEngine;
  onBarClick?: (start: string, end: string) => void;
  loading?: boolean;
  totalBytes?: number; // 新增：处理字节数 // Logan.Li
  lineLimitReached?: boolean; // 新增：是否达到行限制
  coverage?: string; // 新增：时间覆盖率
}

const ENGINE_COLORS: Record<LogEngine, { fill: string; stroke: string }> = {
  loki: { fill: 'url(#gradientLoki)', stroke: '#06b6d4' },
  elasticsearch: { fill: 'url(#gradientES)', stroke: '#22c55e' },
  sls: { fill: 'url(#gradientSLS)', stroke: '#f97316' },
};

function formatTimeLabel(ts: string): string {
  const parts = ts.split(':');
  return parts.length >= 2 ? `${parts[0].slice(-2)}:${parts[1]}` : ts.slice(-5);
}

function formatBytes(bytes: number): string {
  if (bytes < 1024) return `${bytes} B`;
  if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(2)} KB`;
  return `${(bytes / 1024 / 1024).toFixed(2)} MB`;
}

export function LogHistogram({ data, engine, onBarClick, loading, totalBytes, lineLimitReached, coverage }: LogHistogramProps) {
  const colors = ENGINE_COLORS[engine];

  const chartData = useMemo(() => {
    return data.map(d => ({ ...d, label: formatTimeLabel(d.timestamp) }));
  }, [data]);

  if (loading) {
    return (
      <div className="rounded-lg border animate-pulse" style={{ background: 'var(--dg-bg-secondary)', borderColor: 'var(--dg-border)' }}>
        <div className="h-[140px] flex items-center justify-center">
          <span className="text-xs" style={{ color: 'var(--dg-text-muted)' }}>Loading log volume...</span>
        </div>
      </div>
    );
  }

  if (chartData.length === 0) {
    return (
      <div className="rounded-lg border flex items-center justify-center" style={{ background: 'var(--dg-bg-secondary)', borderColor: 'var(--dg-border)', minHeight: '100px' }}>
        <span className="text-xs" style={{ color: 'var(--dg-text-muted)' }}>Enter a query to display volume</span>
      </div>
    );
  }

  return (
    <div>
      {/* 统计提示行 */}
      {(lineLimitReached || coverage || totalBytes) && (
        <div className="flex flex-wrap items-center gap-x-4 gap-y-1 mb-2 text-[11px]" style={{ color: 'var(--dg-text-muted)' }}>
          {lineLimitReached && (
            <span>
              <span style={{ color: '#f59e0b' }}>Line limit reached</span>
              {coverage && `, received logs cover ${coverage}`}
            </span>
          )}
          {totalBytes !== undefined && (
            <span>Total bytes processed: <span className="font-medium" style={{ color: 'var(--dg-text-secondary)' }}>{formatBytes(totalBytes)}</span></span>
          )}
        </div>
      )}

      <div className="h-[140px] rounded-lg border" style={{ background: 'var(--dg-bg-secondary)', borderColor: 'var(--dg-border)' }}>
        <ResponsiveContainer width="100%" height="100%">
          <AreaChart data={chartData} margin={{ top: 8, right: 8, bottom: 0, left: 0 }}>
            <defs>
              <linearGradient id="gradientLoki" x1="0" y1="0" x2="0" y2="1">
                <stop offset="0%" stopColor="#06b6d4" stopOpacity={0.3} />
                <stop offset="100%" stopColor="#06b6d4" stopOpacity={0.02} />
              </linearGradient>
              <linearGradient id="gradientES" x1="0" y1="0" x2="0" y2="1">
                <stop offset="0%" stopColor="#22c55e" stopOpacity={0.3} />
                <stop offset="100%" stopColor="#22c55e" stopOpacity={0.02} />
              </linearGradient>
              <linearGradient id="gradientSLS" x1="0" y1="0" x2="0" y2="1">
                <stop offset="0%" stopColor="#f97316" stopOpacity={0.3} />
                <stop offset="100%" stopColor="#f97316" stopOpacity={0.02} />
              </linearGradient>
            </defs>
            <CartesianGrid strokeDasharray="3 3" stroke="var(--dg-border)" vertical={false} />
            <XAxis
              dataKey="label"
              tick={{ fontSize: 10, fill: 'var(--dg-text-muted)' }}
              axisLine={{ stroke: 'var(--dg-border)' }}
              tickLine={false}
              interval="preserveStartEnd"
            />
            <YAxis
              tick={{ fontSize: 10, fill: 'var(--dg-text-muted)' }}
              axisLine={false}
              tickLine={false}
              width={35}
            />
            <Tooltip
              contentStyle={{
                background: 'var(--dg-bg-secondary)',
                border: '1px solid var(--dg-border)',
                borderRadius: '6px',
                fontSize: '11px',
                color: 'var(--dg-text-primary)',
              }}
              formatter={(value: number) => [`${value} 条`, 'logs']}
              labelFormatter={(label: string) => {
                const item = chartData.find(d => d.label === label);
                return item ? item.timestamp : label;
              }}
            />
            <Area
              type="monotone"
              dataKey="count"
              stroke={colors.stroke}
              fill={colors.fill}
              strokeWidth={1.5}
              dot={false}
              activeDot={{ r: 3, stroke: colors.stroke, strokeWidth: 1 }}
              onClick={(entry: any) => {
                if (onBarClick && entry?.timestamp) {
                  const start = entry.timestamp;
                  const end = start.slice(0, 13) + ':59:59';
                  onBarClick(start, end);
                }
              }}
              style={{ cursor: onBarClick ? 'pointer' : 'default' }}
            />
          </AreaChart>
        </ResponsiveContainer>
      </div>
    </div>
  );
}