// 可缩放面积图 — 光标拖拽选区 / 宽屏弹框展开 // Logan.Li
import {
  useState, useMemo, useCallback, useId, useEffect,
  forwardRef, useImperativeHandle,
} from 'react';
import {
  AreaChart, Area, XAxis, YAxis, CartesianGrid, Tooltip,
  ResponsiveContainer, ReferenceArea, ReferenceLine,
} from 'recharts';
import {
  Dialog, DialogContent, DialogDescription, DialogHeader, DialogTitle,
} from '@/components/ui/dialog';
import { ChartToolbar } from './ChartToolbar';
import { MonitorChartTooltip } from '../shared/monitorChartTheme';
import { ChartRangeHint } from '../shared/ChartRangeHint';
import { useTranslation } from 'react-i18next';

export interface ChartSeries {
  dataKey: string;
  color: string;
  label: string;
}

export interface ChartReferenceLine {
  value: number;
  label?: string;
  color?: string;
}

export interface ZoomableChartHandle {
  expand: () => void;
  resetZoom: () => void;
}

interface ZoomRange {
  left: string;
  right: string;
}

interface Props {
  data: Record<string, unknown>[];
  series: ChartSeries[];
  xDataKey?: string;
  height?: number | string;
  unit?: string;
  yDomain?: [number, number | 'auto'];
  chartId: string;
  title?: string;
  subtitle?: string;
  showHint?: boolean;
  /** header=按钮由父组件放在卡片标题栏；overlay=浮在图表右上角（无卡片场景） // Logan.Li */
  toolbarPlacement?: 'header' | 'overlay';
  onZoomedChange?: (zoomed: boolean) => void;
  referenceLines?: ChartReferenceLine[];
}

const dialogClass =
  '!max-w-[min(96vw,88rem)] sm:!max-w-[min(96vw,88rem)] w-[min(96vw,88rem)] max-h-[92vh] flex flex-col gap-2 p-4 sm:p-5 bg-[var(--dg-bg-primary)] border-[var(--dg-border)] overflow-hidden';

function ChartBody({
  displayData,
  series,
  xDataKey,
  height,
  unit,
  yDomain,
  gradPrefix,
  refLeft,
  refRight,
  onMouseDown,
  onMouseMove,
  onMouseUp,
  compact,
  referenceLines,
}: {
  displayData: Record<string, unknown>[];
  series: ChartSeries[];
  xDataKey: string;
  height: number | string;
  unit: string;
  yDomain: [number, number | 'auto'];
  gradPrefix: string;
  zoomRange: ZoomRange | null;
  refLeft: string;
  refRight: string;
  onMouseDown: (e: { activeLabel?: string }) => void;
  onMouseMove: (e: { activeLabel?: string }) => void;
  onMouseUp: () => void;
  compact?: boolean;
  referenceLines?: ChartReferenceLine[];
}) {
  return (
    <div style={{ height }} className="select-none w-full min-h-0">
      <ResponsiveContainer width="100%" height="100%">
        <AreaChart
          data={displayData}
          margin={{ top: 6, right: compact ? 12 : 8, bottom: compact ? 12 : 8, left: 2 }}
          onMouseDown={onMouseDown}
          onMouseMove={onMouseMove}
          onMouseUp={onMouseUp}
          style={{ cursor: 'crosshair' }}
        >
          <defs>
            {series.map((s) => (
              <linearGradient key={s.dataKey} id={`${gradPrefix}-${s.dataKey}`} x1="0" y1="0" x2="0" y2="1">
                <stop offset="5%" stopColor={s.color} stopOpacity={0.35} />
                <stop offset="95%" stopColor={s.color} stopOpacity={0} />
              </linearGradient>
            ))}
          </defs>
          <CartesianGrid strokeDasharray="3 3" stroke="var(--dg-border)" strokeOpacity={0.6} />
          <XAxis
            dataKey={xDataKey}
            tick={{ fontSize: compact ? 11 : 10, fill: 'var(--dg-text-muted)' }}
            tickLine={false}
            axisLine={{ stroke: 'var(--dg-border)' }}
            interval="preserveStartEnd"
            minTickGap={compact ? 56 : 40}
          />
          <YAxis
            tick={{ fontSize: compact ? 11 : 10, fill: 'var(--dg-text-muted)' }}
            tickLine={false}
            axisLine={false}
            width={compact ? 44 : 36}
            domain={yDomain[1] === 'auto' ? [0, (max: number) => max * 1.15] : yDomain as [number, number]}
            tickFormatter={(v: number) => (v >= 1000 ? `${(v / 1000).toFixed(1)}k` : String(Math.round(v * 10) / 10))}
          />
          <Tooltip
            content={(
              <MonitorChartTooltip
                nameFormatter={(name) => series.find((s) => s.dataKey === name)?.label || name}
                valueFormatter={(v) => `${Number(v).toFixed(2)}${unit ? ` ${unit}` : ''}`}
              />
            )}
          />
          {referenceLines?.map((line) => (
            <ReferenceLine
              key={`ref-${line.value}-${line.label || ''}`}
              y={line.value}
              stroke={line.color || 'var(--dg-yellow)'}
              strokeDasharray="4 4"
              strokeOpacity={0.75}
              label={{
                value: line.label || String(line.value),
                position: 'insideTopRight',
                fontSize: compact ? 10 : 9,
                fill: line.color || 'var(--dg-yellow)',
              }}
            />
          ))}
          {series.map((s) => (
            <Area
              key={s.dataKey}
              type="monotone"
              dataKey={s.dataKey}
              stroke={s.color}
              strokeWidth={compact ? 2 : 1.5}
              fill={`url(#${gradPrefix}-${s.dataKey})`}
              name={s.dataKey}
              activeDot={{ r: compact ? 5 : 4, strokeWidth: 0 }}
              isAnimationActive={false}
            />
          ))}
          {refLeft && refRight ? (
            <ReferenceArea
              x1={refLeft}
              x2={refRight}
              strokeOpacity={0.4}
              fill="var(--dg-blue)"
              fillOpacity={0.15}
              stroke="var(--dg-blue)"
            />
          ) : null}
        </AreaChart>
      </ResponsiveContainer>
    </div>
  );
}

export const ZoomableAreaChart = forwardRef<ZoomableChartHandle, Props>(function ZoomableAreaChart({
  data,
  series,
  xDataKey = 'time',
  height = 192,
  unit = '',
  yDomain = [0, 'auto'],
  chartId,
  title,
  subtitle,
  showHint = true,
  toolbarPlacement = 'header',
  onZoomedChange,
  referenceLines,
}, ref) {
  const { t } = useTranslation();
  const uid = useId().replace(/:/g, '');
  const gradPrefix = `grad-${chartId}-${uid}`;

  const [zoomRange, setZoomRange] = useState<ZoomRange | null>(null);
  const [refLeft, setRefLeft] = useState('');
  const [refRight, setRefRight] = useState('');
  const [expanded, setExpanded] = useState(false);

  const dataFingerprint = useMemo(() => {
    if (data.length === 0) return 'empty';
    const first = data[0]?.[xDataKey];
    const last = data[data.length - 1]?.[xDataKey];
    return `${data.length}|${String(first)}|${String(last)}`;
  }, [data, xDataKey]);

  useEffect(() => {
    // eslint-disable-next-line react-hooks/set-state-in-effect
    setZoomRange(null);
    setRefLeft('');
    setRefRight('');
    setExpanded(false);
  }, [dataFingerprint]);

  useEffect(() => {
    onZoomedChange?.(!!zoomRange);
  }, [zoomRange, onZoomedChange]);

  const displayData = useMemo(() => {
    if (!zoomRange || data.length === 0) return data;
    const li = data.findIndex((d) => d[xDataKey] === zoomRange.left);
    const ri = data.findIndex((d) => d[xDataKey] === zoomRange.right);
    if (li < 0 || ri < 0) return data;
    const start = Math.min(li, ri);
    const end = Math.max(li, ri);
    if (end - start < 2) return data;
    return data.slice(start, end + 1);
  }, [data, zoomRange, xDataKey]);

  const zoomOut = useCallback(() => {
    setZoomRange(null);
    setRefLeft('');
    setRefRight('');
  }, []);

  useImperativeHandle(ref, () => ({
    expand: () => setExpanded(true),
    resetZoom: zoomOut,
  }), [zoomOut]);

  const onMouseDown = useCallback((e: { activeLabel?: string }) => {
    if (!e?.activeLabel) return;
    setRefLeft(String(e.activeLabel));
    setRefRight(String(e.activeLabel));
  }, []);

  const onMouseMove = useCallback((e: { activeLabel?: string }) => {
    if (!refLeft || !e?.activeLabel) return;
    setRefRight(String(e.activeLabel));
  }, [refLeft]);

  const onMouseUp = useCallback(() => {
    if (!refLeft || !refRight || refLeft === refRight) {
      setRefLeft('');
      setRefRight('');
      return;
    }
    setZoomRange({ left: refLeft, right: refRight });
    setRefLeft('');
    setRefRight('');
  }, [refLeft, refRight]);

  const chartProps = {
    displayData,
    series,
    xDataKey,
    unit,
    yDomain,
    gradPrefix,
    zoomRange,
    refLeft,
    refRight,
    onMouseDown,
    onMouseMove,
    onMouseUp,
    referenceLines,
  };

  if (data.length === 0) {
    return (
      <div
        className="flex items-center justify-center text-xs dg-text-muted border border-dashed border-[var(--dg-border)] rounded-md w-full"
        style={{ height }}
      >
        {t('monitor.lbl.noData')}
      </div>
    );
  }

  return (
    <>
      <div className="relative w-full">
        {toolbarPlacement === 'overlay' && (
          <div className="absolute top-1 right-1 z-10">
            <ChartToolbar
              zoomed={!!zoomRange}
              onExpand={() => setExpanded(true)}
              onResetZoom={zoomOut}
            />
          </div>
        )}
        <ChartBody {...chartProps} height={height} />
        {showHint && toolbarPlacement === 'header' && (
          <ChartRangeHint
            label={zoomRange ? `${zoomRange.left} — ${zoomRange.right}` : null}
            zoomed={!!zoomRange}
            onReset={zoomOut}
          />
        )}
      </div>

      <Dialog open={expanded} onOpenChange={setExpanded}>
        <DialogContent className={dialogClass}>
          <DialogHeader className="shrink-0 flex-row items-start justify-between gap-4 space-y-0 pr-10">
            <div className="min-w-0">
              <DialogTitle className="text-base truncate">{title || t('monitor.lbl.metricDetail')}</DialogTitle>
              {subtitle && (
                <p className="text-xs dg-text-muted mt-0.5 truncate">{subtitle}</p>
              )}
              <DialogDescription className="sr-only"> {t('monitor.lbl.selectHost')} </DialogDescription>
            </div>
            <ChartToolbar
              size="md"
              zoomed={!!zoomRange}
              onExpand={() => setExpanded(true)}
              onResetZoom={zoomOut}
            />
          </DialogHeader>

          {series.length > 1 && (
            <div className="flex flex-wrap items-center gap-4 text-xs shrink-0 px-0.5">
              {series.map((s) => (
                <span key={s.dataKey} className="inline-flex items-center gap-1.5 dg-text-secondary">
                  <span className="w-3 h-0.5 rounded-full" style={{ backgroundColor: s.color }} />
                  {s.label}
                </span>
              ))}
            </div>
          )}

          {/* 宽屏趋势区：21:8 比例，监控弹框标准形态 // Logan.Li */}
          <div className="w-full flex-1 min-h-[260px] max-h-[min(48vh,480px)] aspect-[21/8]">
            <ChartBody {...chartProps} height="100%" compact />
          </div>

          {zoomRange && (
            <div className="shrink-0 border-t border-[var(--dg-border)] pt-2">
              <ChartRangeHint
                label={`${zoomRange.left} — ${zoomRange.right}`}
                zoomed
                onReset={zoomOut}
              />
            </div>
          )}
        </DialogContent>
      </Dialog>
    </>
  );
});