import React, { useEffect, useMemo, useRef, useState } from 'react';
import {
  Bot,
  Compass,
  Crosshair,
  Download,
  Megaphone,
  Minus,
  Plus,
  RotateCcw,
  ScrollText,
  Target,
  TrendingUp,
  UserCheck,
  X,
  Zap,
} from 'lucide-react';
import { useTheme } from '../../contexts/ThemeContext';
import type { ExpertCard, SixStepMessage } from './types';
import {
  CURRENT_PAIR_BY_STAGE,
  EDGE_COLOR,
  EDGE_LABEL,
  STATUS_TITLE,
  VARIANT_LABEL,
  buildEdgePath,
  buildLayout,
  type LayoutEdge,
  type LayoutNode,
} from './flowLayout';

interface SixStepFlowFullscreenProps {
  message?: SixStepMessage;
  onClose: () => void;
}

const SCALE_MIN = 0.2;
const SCALE_MAX = 3;

const buildExpertRootDetail = (expert: ExpertCard): string => {
  const segments = [expert.title, expert.detail].filter((item): item is string => Boolean(item && item.trim()));
  return segments.join(' · ') || '已确认专家';
};

const VARIANT_TOKEN: Record<LayoutNode['variant'], {
  dark: string; light: string;
  icon: React.ComponentType<{ className?: string }>;
  iconCls: { dark: string; light: string };
}> = {
  agent:     { dark: 'from-slate-700/80 to-slate-900/80 border-slate-500/60',       light: 'from-white to-slate-50 border-slate-300',        icon: Bot,       iconCls: { dark: 'bg-slate-500/30 text-slate-200',     light: 'bg-slate-100 text-slate-600' } },
  purpose:   { dark: 'from-violet-700/40 to-violet-900/40 border-violet-400/50',    light: 'from-orange-50 to-white border-orange-300',      icon: Target,    iconCls: { dark: 'bg-violet-500/30 text-violet-200',   light: 'bg-orange-100 text-orange-600' } },
  actor:     { dark: 'from-cyan-700/40 to-cyan-900/40 border-cyan-400/50',          light: 'from-red-50 to-white border-red-300',            icon: UserCheck, iconCls: { dark: 'bg-cyan-500/30 text-cyan-200',      light: 'bg-red-100 text-red-600' } },
  behavior:  { dark: 'from-emerald-700/40 to-emerald-900/40 border-emerald-400/50', light: 'from-emerald-50 to-white border-emerald-300',    icon: TrendingUp,iconCls: { dark: 'bg-emerald-500/30 text-emerald-200', light: 'bg-emerald-100 text-emerald-700' } },
  driver:    { dark: 'from-emerald-800/40 to-teal-900/40 border-teal-400/50',       light: 'from-teal-50 to-white border-teal-300',          icon: Zap,       iconCls: { dark: 'bg-teal-500/30 text-teal-200',      light: 'bg-teal-100 text-teal-700' } },
  narrative: { dark: 'from-amber-700/40 to-amber-900/40 border-amber-400/50',       light: 'from-amber-50 to-white border-amber-300',        icon: ScrollText,iconCls: { dark: 'bg-amber-500/30 text-amber-200',    light: 'bg-amber-100 text-amber-600' } },
};

const MINIMAP_VARIANT_FILL: Record<LayoutNode['variant'], { dark: string; light: string }> = {
  agent: { dark: '#475569', light: '#cbd5e1' },
  purpose: { dark: '#7c3aed', light: '#fb923c' },
  actor: { dark: '#06b6d4', light: '#ef4444' },
  behavior: { dark: '#10b981', light: '#10b981' },
  driver: { dark: '#0d9488', light: '#0d9488' },
  narrative: { dark: '#f59e0b', light: '#f59e0b' },
};

const DetailNode: React.FC<{
  node: LayoutNode;
  isDark: boolean;
  collapsible: boolean;
  collapsed: boolean;
  onToggleCollapse?: (nodeId: string) => void;
  entering: boolean;
  exiting: boolean;
}> = ({ node, isDark, collapsible, collapsed, onToggleCollapse, entering, exiting }) => {
  const token = VARIANT_TOKEN[node.variant];
  const Icon = token.icon;
  const grad = isDark ? token.dark : token.light;
  const canToggle = collapsible && Boolean(onToggleCollapse);
  const handleClick = (e: React.MouseEvent<SVGGElement>) => {
    if (!canToggle) return;
    e.stopPropagation();
    onToggleCollapse?.(node.id);
  };
  const handleMouseDown = (e: React.MouseEvent<SVGGElement>) => {
    if (canToggle) e.stopPropagation();
  };
  return (
    <g
      onMouseDown={handleMouseDown}
      onClick={handleClick}
      style={{
        cursor: canToggle ? 'pointer' : undefined,
        opacity: exiting ? 0 : 1,
        transform: entering || exiting ? 'translateY(8px)' : 'translateY(0)',
        transformOrigin: `${node.x + node.width / 2}px ${node.y + node.height / 2}px`,
        transition: `opacity ${COLLAPSE_TRANSITION_MS}ms ease, transform ${COLLAPSE_TRANSITION_MS}ms ease`,
      }}
    >
      <foreignObject x={node.x} y={node.y} width={node.width} height={node.height}>
        <div className={`relative w-full h-full rounded-2xl border bg-gradient-to-br ${grad} backdrop-blur-sm p-2.5 shadow-sm overflow-hidden`}>
          {collapsible && (
            <div
              className={`absolute right-2 top-2 w-4 h-4 rounded-full flex items-center justify-center text-[10px] font-bold ${
                isDark ? 'bg-slate-800/75 text-slate-200' : 'bg-white text-slate-600 border border-slate-200'
              }`}
              title={collapsed ? '展开子节点' : '收起子节点'}
            >
              {collapsed ? '+' : '-'}
            </div>
          )}
          <div className="flex items-center gap-1.5 mb-1">
            <div className={`w-5 h-5 rounded-md flex items-center justify-center ${token.iconCls[isDark ? 'dark' : 'light']}`}>
              <Icon className="w-3 h-3" />
            </div>
            <span className={`text-[10px] uppercase tracking-wider font-semibold ${isDark ? 'text-white/70' : 'text-slate-500'}`}>
              {VARIANT_LABEL[node.variant]}
            </span>
          </div>
          <div className={`text-xs font-semibold leading-tight line-clamp-1 ${isDark ? 'text-white' : 'text-slate-900'}`}>
            {node.title}
          </div>
          <div className={`text-[11px] leading-snug line-clamp-2 mt-0.5 ${isDark ? 'text-slate-300' : 'text-slate-600'}`}>
            {node.detail || '—'}
          </div>
        </div>
      </foreignObject>
    </g>
  );
};

const ToolbarButton: React.FC<{ title: string; onClick: () => void; isDark: boolean; children: React.ReactNode }> = ({ title, onClick, isDark, children }) => (
  <button
    type="button"
    title={title}
    onClick={onClick}
    className={`sixstep-toolbar-btn ${
      isDark ? 'text-slate-300 hover:bg-slate-700/70 hover:text-white' : 'text-gray-600 hover:bg-gray-100 hover:text-gray-900'
    }`}
  >
    {children}
  </button>
);

interface MinimapProps {
  layout: { nodes: LayoutNode[]; width: number; height: number };
  transform: { tx: number; ty: number; scale: number };
  viewportSize: { width: number; height: number };
  onJump: (worldX: number, worldY: number) => void;
  isDark: boolean;
}

const MINIMAP_W = 220;
const MINIMAP_H = 150;
const COLLAPSE_TRANSITION_MS = 240;

const Minimap: React.FC<MinimapProps> = ({ layout, transform, viewportSize, onJump, isDark }) => {
  const ratio = layout.width > 0 && layout.height > 0
    ? Math.min((MINIMAP_W - 10) / layout.width, (MINIMAP_H - 10) / layout.height)
    : 0.1;
  const renderW = layout.width * ratio;
  const renderH = layout.height * ratio;
  const offsetX = (MINIMAP_W - renderW) / 2;
  const offsetY = (MINIMAP_H - renderH) / 2;

  // Visible area (in world coords): from world (-tx/scale, -ty/scale) with size viewportW/scale × viewportH/scale
  const viewW = viewportSize.width / transform.scale;
  const viewH = viewportSize.height / transform.scale;
  const viewX = -transform.tx / transform.scale;
  const viewY = -transform.ty / transform.scale;

  const handleClick = (e: React.MouseEvent<SVGSVGElement>) => {
    const rect = e.currentTarget.getBoundingClientRect();
    const mx = e.clientX - rect.left - offsetX;
    const my = e.clientY - rect.top - offsetY;
    const wx = mx / ratio;
    const wy = my / ratio;
    onJump(wx, wy);
  };

  return (
    <div className={`rounded-xl overflow-hidden border shadow-lg backdrop-blur-md ${
      isDark ? 'bg-slate-900/80 border-slate-700/70' : 'bg-white/90 border-gray-200'
    }`}>
      <div className={`px-3 py-1.5 text-[10px] uppercase tracking-wider border-b font-medium ${
        isDark ? 'text-slate-400 border-slate-700/50' : 'text-gray-500 border-gray-100'
      }`}>
        缩略图
      </div>
      <svg
        width={MINIMAP_W}
        height={MINIMAP_H}
        onClick={handleClick}
        style={{ cursor: 'pointer' }}
      >
        <rect width={MINIMAP_W} height={MINIMAP_H} fill={isDark ? '#0f172a' : '#f8fafc'} />
        <g transform={`translate(${offsetX}, ${offsetY}) scale(${ratio})`}>
          {layout.nodes.map((n) => (
            <rect
              key={n.id}
              x={n.x}
              y={n.y}
              width={n.width}
              height={n.height}
              rx={6}
              fill={MINIMAP_VARIANT_FILL[n.variant][isDark ? 'dark' : 'light']}
              opacity={0.75}
            />
          ))}
        </g>
        <rect
          className="sixstep-minimap-rect"
          x={offsetX + viewX * ratio}
          y={offsetY + viewY * ratio}
          width={Math.max(6, viewW * ratio)}
          height={Math.max(6, viewH * ratio)}
          rx={3}
        />
      </svg>
    </div>
  );
};

const SixStepFlowFullscreen: React.FC<SixStepFlowFullscreenProps> = ({ message, onClose }) => {
  const { theme } = useTheme();
  const isDark = theme === 'dark';

  const purposes = message?.stages?.purpose?.cards ?? [];
  const actors = message?.stages?.actor?.cards ?? [];
  const behaviors = message?.stages?.behavior?.cards ?? [];
  const narratives = message?.stages?.narrative?.cards ?? [];
  const selectedExpert = message?.selectedExpert;

  const layout = useMemo(
    () => buildLayout(purposes, actors, behaviors, narratives, {
      rootTitle: selectedExpert?.name,
      rootDetail: selectedExpert ? buildExpertRootDetail(selectedExpert) : undefined,
    }),
    [purposes, actors, behaviors, narratives, selectedExpert],
  );

  const currentSub = message?.currentSubStep;
  const activePair = currentSub ? CURRENT_PAIR_BY_STAGE[currentSub] : null;
  const statusTitle = currentSub ? STATUS_TITLE[currentSub] : '推演结果可视化';
  const generating = Boolean(currentSub);

  const [transform, setTransform] = useState({ tx: 0, ty: 0, scale: 1 });
  const [isPanning, setIsPanning] = useState(false);
  const [viewportSize, setViewportSize] = useState({ width: 800, height: 600 });
  const [collapsedNodeIds, setCollapsedNodeIds] = useState<Set<string>>(new Set());
  const [displayedNodeIds, setDisplayedNodeIds] = useState<Set<string>>(new Set());
  const [enteringNodeIds, setEnteringNodeIds] = useState<Set<string>>(new Set());
  const [exitingNodeIds, setExitingNodeIds] = useState<Set<string>>(new Set());
  const [displayedEdgeIds, setDisplayedEdgeIds] = useState<Set<string>>(new Set());
  const [exitingEdgeIds, setExitingEdgeIds] = useState<Set<string>>(new Set());
  const containerRef = useRef<HTMLDivElement>(null);
  const svgRef = useRef<SVGSVGElement>(null);
  const panStart = useRef<{ x: number; y: number; tx: number; ty: number } | null>(null);
  const transitionTimerRef = useRef<number | null>(null);

  const nodeMap = useMemo(() => new Map(layout.nodes.map((node) => [node.id, node])), [layout.nodes]);

  const targetVisibleNodeSet = useMemo(() => {
    const visible = new Set<string>();
    layout.nodes.forEach((node) => {
      let parentId = node.parent;
      let hidden = false;
      while (parentId) {
        if (collapsedNodeIds.has(parentId)) {
          hidden = true;
          break;
        }
        parentId = nodeMap.get(parentId)?.parent;
      }
      if (!hidden) visible.add(node.id);
    });
    return visible;
  }, [collapsedNodeIds, layout.nodes, nodeMap]);

  const targetVisibleEdgeSet = useMemo(() => {
    const visible = new Set<string>();
    layout.edges.forEach((edge) => {
      if (targetVisibleNodeSet.has(edge.fromId) && targetVisibleNodeSet.has(edge.toId)) {
        visible.add(edge.id);
      }
    });
    return visible;
  }, [layout.edges, targetVisibleNodeSet]);

  const renderedNodeSet = displayedNodeIds.size > 0 ? displayedNodeIds : targetVisibleNodeSet;
  const renderedEdgeSet = displayedEdgeIds.size > 0 ? displayedEdgeIds : targetVisibleEdgeSet;
  const renderedNodes = useMemo(
    () => layout.nodes.filter((node) => renderedNodeSet.has(node.id)),
    [layout.nodes, renderedNodeSet],
  );
  const renderedEdges = useMemo(
    () => layout.edges.filter((edge) => renderedEdgeSet.has(edge.id)),
    [layout.edges, renderedEdgeSet],
  );

  const toggleNodeCollapse = (nodeId: string) => {
    const node = nodeMap.get(nodeId);
    if (!node || node.children.length === 0) return;
    setCollapsedNodeIds((prev) => {
      const next = new Set(prev);
      if (next.has(nodeId)) next.delete(nodeId);
      else next.add(nodeId);
      return next;
    });
  };

  useEffect(() => {
    const update = () => {
      const el = containerRef.current;
      if (!el) return;
      const rect = el.getBoundingClientRect();
      setViewportSize({ width: rect.width, height: rect.height });
    };
    update();
    window.addEventListener('resize', update);
    return () => window.removeEventListener('resize', update);
  }, []);

  // Native wheel listener with passive:false so preventDefault actually blocks browser zoom
  useEffect(() => {
    const container = containerRef.current;
    if (!container) return;
    const onWheel = (e: WheelEvent) => {
      e.preventDefault();
      const rect = container.getBoundingClientRect();
      const mx = e.clientX - rect.left;
      const my = e.clientY - rect.top;
      const delta = -e.deltaY * 0.0015;
      setTransform((prev) => {
        const nextScale = Math.max(SCALE_MIN, Math.min(SCALE_MAX, prev.scale * (1 + delta)));
        const ratio = nextScale / prev.scale;
        return { tx: mx - (mx - prev.tx) * ratio, ty: my - (my - prev.ty) * ratio, scale: nextScale };
      });
    };
    container.addEventListener('wheel', onWheel, { passive: false });
    return () => container.removeEventListener('wheel', onWheel);
  }, []);

  const handlePanStart = (e: React.MouseEvent) => {
    if (e.button !== 0) return;
    panStart.current = { x: e.clientX, y: e.clientY, tx: transform.tx, ty: transform.ty };
    setIsPanning(true);
  };

  useEffect(() => {
    if (!isPanning) return;
    const move = (e: MouseEvent) => {
      const start = panStart.current;
      if (!start) return;
      setTransform((prev) => ({ ...prev, tx: start.tx + (e.clientX - start.x), ty: start.ty + (e.clientY - start.y) }));
    };
    const up = () => {
      panStart.current = null;
      setIsPanning(false);
    };
    window.addEventListener('mousemove', move);
    window.addEventListener('mouseup', up);
    return () => {
      window.removeEventListener('mousemove', move);
      window.removeEventListener('mouseup', up);
    };
  }, [isPanning]);

  const fitToView = () => {
    const container = containerRef.current;
    if (!container) return;
    const rect = container.getBoundingClientRect();
    const scale = Math.min((rect.width - 80) / Math.max(layout.width, 1), (rect.height - 80) / Math.max(layout.height, 1), 1);
    const tx = (rect.width - layout.width * scale) / 2;
    const ty = (rect.height - layout.height * scale) / 2;
    setTransform({ tx, ty, scale });
  };

  const centerView = () => {
    const container = containerRef.current;
    if (!container) return;
    const rect = container.getBoundingClientRect();
    setTransform((prev) => ({
      ...prev,
      tx: (rect.width - layout.width * prev.scale) / 2,
      ty: (rect.height - layout.height * prev.scale) / 2,
    }));
  };

  const zoomIn = () => setTransform((prev) => ({ ...prev, scale: Math.min(SCALE_MAX, prev.scale * 1.2) }));
  const zoomOut = () => setTransform((prev) => ({ ...prev, scale: Math.max(SCALE_MIN, prev.scale / 1.2) }));
  const reset = () => setTransform({ tx: 0, ty: 0, scale: 1 });

  const fitAppliedRef = useRef(false);
  useEffect(() => {
    if (!fitAppliedRef.current && viewportSize.width > 0 && layout.nodes.length > 1) {
      fitToView();
      fitAppliedRef.current = true;
    }
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [viewportSize.width, layout.nodes.length]);

  const handleMinimapJump = (wx: number, wy: number) => {
    const container = containerRef.current;
    if (!container) return;
    const rect = container.getBoundingClientRect();
    setTransform((prev) => ({
      ...prev,
      tx: rect.width / 2 - wx * prev.scale,
      ty: rect.height / 2 - wy * prev.scale,
    }));
  };

  const handleDownload = () => {
    const svg = svgRef.current;
    if (!svg) return;
    const cloned = svg.cloneNode(true) as SVGSVGElement;
    cloned.setAttribute('xmlns', 'http://www.w3.org/2000/svg');
    cloned.setAttribute('width', String(layout.width));
    cloned.setAttribute('height', String(layout.height));
    cloned.setAttribute('viewBox', `0 0 ${layout.width} ${layout.height}`);
    const inner = cloned.querySelector('g');
    if (inner) inner.setAttribute('transform', '');
    const serializer = new XMLSerializer();
    const svgString = serializer.serializeToString(cloned);
    const blob = new Blob([svgString], { type: 'image/svg+xml;charset=utf-8' });
    const url = URL.createObjectURL(blob);
    const link = document.createElement('a');
    link.href = url;
    link.download = `6步法推演-${new Date().toISOString().slice(0, 19).replace(/[:T]/g, '-')}.svg`;
    document.body.appendChild(link);
    link.click();
    document.body.removeChild(link);
    URL.revokeObjectURL(url);
  };

  useEffect(() => {
    const onKey = (e: KeyboardEvent) => {
      if (e.key === 'Escape') onClose();
    };
    window.addEventListener('keydown', onKey);
    return () => window.removeEventListener('keydown', onKey);
  }, [onClose]);

  useEffect(() => {
    const validIds = new Set(layout.nodes.filter((node) => node.children.length > 0).map((node) => node.id));
    setCollapsedNodeIds((prev) => {
      let changed = false;
      const next = new Set<string>();
      prev.forEach((id) => {
        if (validIds.has(id)) next.add(id);
        else changed = true;
      });
      return changed ? next : prev;
    });
  }, [layout.nodes]);

  useEffect(() => {
    if (transitionTimerRef.current) {
      window.clearTimeout(transitionTimerRef.current);
      transitionTimerRef.current = null;
    }

    const prevNodes = displayedNodeIds;
    const nextNodes = targetVisibleNodeSet;
    const prevEdges = displayedEdgeIds;
    const nextEdges = targetVisibleEdgeSet;

    const enteringNodes = new Set([...nextNodes].filter((id) => !prevNodes.has(id)));
    const leavingNodes = new Set([...prevNodes].filter((id) => !nextNodes.has(id)));
    const leavingEdges = new Set([...prevEdges].filter((id) => !nextEdges.has(id)));
    const mergedNodes = new Set([...prevNodes, ...nextNodes]);
    const mergedEdges = new Set([...prevEdges, ...nextEdges]);

    setEnteringNodeIds(enteringNodes);
    setExitingNodeIds(leavingNodes);
    setExitingEdgeIds(leavingEdges);
    setDisplayedNodeIds(mergedNodes);
    setDisplayedEdgeIds(mergedEdges);

    transitionTimerRef.current = window.setTimeout(() => {
      setDisplayedNodeIds(new Set(nextNodes));
      setDisplayedEdgeIds(new Set(nextEdges));
      setEnteringNodeIds(new Set());
      setExitingNodeIds(new Set());
      setExitingEdgeIds(new Set());
      transitionTimerRef.current = null;
    }, COLLAPSE_TRANSITION_MS);
  }, [targetVisibleNodeSet, targetVisibleEdgeSet]);

  useEffect(() => {
    return () => {
      if (transitionTimerRef.current) window.clearTimeout(transitionTimerRef.current);
    };
  }, []);

  return (
    <div className={`fixed inset-0 z-50 flex flex-col ${isDark ? 'bg-slate-950/95' : 'bg-white/95'} backdrop-blur-sm`}>
      <div className={`flex items-center justify-between gap-3 px-5 py-3 border-b ${
        isDark ? 'border-slate-700/60 bg-slate-900/70' : 'border-red-100 bg-white'
      }`}>
        <div className="flex items-center gap-3 min-w-0">
          <div className={`w-9 h-9 rounded-2xl flex items-center justify-center ${
            isDark ? 'bg-cyan-500/15 text-cyan-300' : 'bg-red-50 text-red-500'
          } ${generating ? 'sixstep-pulse' : ''}`}>
            <Compass className="w-5 h-5" />
          </div>
          <div className="min-w-0">
            <div className={`text-base font-semibold ${
              generating ? (isDark ? 'sixstep-shimmer-text' : 'sixstep-shimmer-text-light') : (isDark ? 'text-white' : 'text-gray-900')
            }`}>
              {statusTitle}
            </div>
            <div className={`text-xs ${isDark ? 'text-slate-400' : 'text-gray-500'}`}>
              全屏视图 · 完整内容展示
            </div>
          </div>
        </div>

        <div className="flex items-center gap-1">
          <ToolbarButton title="放大" onClick={zoomIn} isDark={isDark}><Plus className="w-4 h-4" /></ToolbarButton>
          <ToolbarButton title="缩小" onClick={zoomOut} isDark={isDark}><Minus className="w-4 h-4" /></ToolbarButton>
          <ToolbarButton title="恢复 1:1" onClick={reset} isDark={isDark}><RotateCcw className="w-4 h-4" /></ToolbarButton>
          <ToolbarButton title="定位到画布中央" onClick={centerView} isDark={isDark}><Crosshair className="w-4 h-4" /></ToolbarButton>
          <ToolbarButton title="下载流程图（SVG）" onClick={handleDownload} isDark={isDark}><Download className="w-4 h-4" /></ToolbarButton>
          <span className={`mx-2 h-5 w-px ${isDark ? 'bg-slate-700' : 'bg-gray-200'}`} />
          <span className={`text-[11px] tabular-nums ${isDark ? 'text-slate-400' : 'text-gray-500'}`}>
            {Math.round(transform.scale * 100)}%
          </span>
          <ToolbarButton title="关闭全屏 (Esc)" onClick={onClose} isDark={isDark}>
            <X className="w-4 h-4" />
          </ToolbarButton>
        </div>
      </div>

      <div className={`flex items-center gap-3 px-5 py-2 border-b text-[11px] flex-wrap ${
        isDark ? 'border-slate-700/60 text-slate-400 bg-slate-900/40' : 'border-red-100 text-gray-500 bg-white'
      }`}>
        {(Object.keys(EDGE_COLOR) as LayoutEdge['pair'][]).map((pair) => {
          const color = EDGE_COLOR[pair][isDark ? 'dark' : 'light'];
          const active = activePair === pair;
          return (
            <span key={pair} className="inline-flex items-center gap-1.5">
              <span className={`inline-block w-6 h-0.5 rounded-full ${active ? 'sixstep-ant-line' : ''}`} style={{ background: color, stroke: color }} />
              <span className={active ? (isDark ? 'text-cyan-200' : 'text-red-600') : ''}>{EDGE_LABEL[pair]}</span>
            </span>
          );
        })}
      </div>

      <div
        ref={containerRef}
        className={`flex-1 overflow-hidden relative ${isPanning ? 'sixstep-canvas-grabbing' : 'sixstep-canvas-grab'}`}
        onMouseDown={handlePanStart}
      >
        {renderedNodes.length <= 1 ? (
          <div className={`h-full flex flex-col items-center justify-center text-center ${
            isDark ? 'text-slate-500' : 'text-gray-400'
          }`}>
            <Megaphone className="w-12 h-12 opacity-40 mb-3" />
            <div className={`text-base font-medium ${isDark ? 'text-slate-300' : 'text-gray-600'}`}>等待推演开始</div>
            <div className="text-sm mt-1">推演产出将以流程图形式呈现</div>
          </div>
        ) : (
          <svg ref={svgRef} width="100%" height="100%" className="block select-none">
            <defs>
              {(Object.keys(EDGE_COLOR) as LayoutEdge['pair'][]).map((pair) => {
                const color = EDGE_COLOR[pair][isDark ? 'dark' : 'light'];
                return (
                  <marker
                    key={pair}
                    id={`sixstep-fs-arrow-${pair}`}
                    viewBox="0 0 8 8"
                    refX="7"
                    refY="4"
                    markerWidth="6"
                    markerHeight="6"
                    orient="auto-start-reverse"
                  >
                    <path d="M 0 0 L 8 4 L 0 8 z" fill={color} />
                  </marker>
                );
              })}
            </defs>

            <g transform={`translate(${transform.tx}, ${transform.ty}) scale(${transform.scale})`}>
              {renderedEdges.map((edge) => {
                const from = nodeMap.get(edge.fromId);
                const to = nodeMap.get(edge.toId);
                if (!from || !to) return null;
                const color = EDGE_COLOR[edge.pair][isDark ? 'dark' : 'light'];
                const isActive = activePair === edge.pair;
                const exiting = exitingEdgeIds.has(edge.id);
                return (
                  <path
                    key={edge.id}
                    d={buildEdgePath(from, to)}
                    fill="none"
                    stroke={color}
                    strokeWidth={isActive ? 2.4 : 1.8}
                    strokeOpacity={exiting ? 0 : isActive ? 1 : 0.75}
                    className={isActive ? 'sixstep-ant-line' : ''}
                    markerEnd={`url(#sixstep-fs-arrow-${edge.pair})`}
                    style={{
                      opacity: exiting ? 0 : 1,
                      transition: `opacity ${COLLAPSE_TRANSITION_MS}ms ease`,
                    }}
                  />
                );
              })}

              {renderedNodes.map((node) => (
                <DetailNode
                  key={node.id}
                  node={node}
                  isDark={isDark}
                  collapsible={node.children.length > 0}
                  collapsed={collapsedNodeIds.has(node.id)}
                  onToggleCollapse={toggleNodeCollapse}
                  entering={enteringNodeIds.has(node.id)}
                  exiting={exitingNodeIds.has(node.id)}
                />
              ))}
            </g>
          </svg>
        )}

        {targetVisibleNodeSet.size > 1 && (
          <div className="absolute bottom-4 right-4">
            <Minimap
              layout={{
                nodes: layout.nodes.filter((node) => targetVisibleNodeSet.has(node.id)),
                width: layout.width,
                height: layout.height,
              }}
              transform={transform}
              viewportSize={viewportSize}
              onJump={handleMinimapJump}
              isDark={isDark}
            />
          </div>
        )}
        <div className={`absolute bottom-4 left-4 px-2 py-1 rounded-md text-[10px] backdrop-blur-md ${
          isDark ? 'bg-slate-800/70 text-slate-400 border border-slate-700/50' : 'bg-white/90 text-gray-500 border border-gray-200'
        }`}>
          点击父节点可收起/展开子节点
        </div>
      </div>
    </div>
  );
};

export default SixStepFlowFullscreen;