import React, { useMemo } from "react";
import { Card, CardContent } from "@/components/ui/card";
import { Skeleton } from "@/components/ui/skeleton";
import { TraceAnalyticsData } from "@/hooks/useDashboardVisualizationData";
import { FileText, ArrowRight, Clock, Zap } from "lucide-react";

interface TraceAnalyticsProps {
  data: TraceAnalyticsData[];
  isLoading?: boolean;
  error?: string | null;
  className?: string;
}

export function TraceAnalytics({
  data,
  isLoading = false,
  error,
  className,
}: TraceAnalyticsProps) {
  // Calculate key metrics
  const stats = useMemo(() => {
    if (!data.length) return null;

    const totalTraces = data.length;
    const avgReadingTime =
      data.reduce((sum, item) => sum + item.readingTime, 0) / totalTraces;
    const avgTimeWithoutAgentGraph =
      data.reduce((sum, item) => sum + item.timeWithoutAgentGraph, 0) /
      totalTraces;
    const avgComplexity =
      data.reduce((sum, item) => sum + item.complexity, 0) / totalTraces;

    const efficiencyMultiplier = avgTimeWithoutAgentGraph / avgReadingTime;
    const timeSavedMinutes = (avgTimeWithoutAgentGraph - avgReadingTime) * 3.5;

    // Simplified complexity calculation - 1-10 scale
    const complexityScore = Math.min(
      10,
      Math.max(1, Math.round(3 + (avgComplexity / 100) * 7))
    );
    const readabilityGrade = Math.min(16, Math.max(6, 6 + complexityScore));

    return {
      timeSavedMinutes,
      efficiencyMultiplier,
      complexityScore, // 1-10 scale for red circle
      readabilityGrade,
    };
  }, [data]);

  if (error) {
    return (
      <Card className={className}>
        <CardContent className="pt-6">
          <div className="text-center py-4">
            <p className="text-sm text-destructive">{error}</p>
          </div>
        </CardContent>
      </Card>
    );
  }

  if (isLoading) {
    return (
      <Card className={className}>
        <CardContent className="pt-6">
          <Skeleton className="h-64 w-full" />
        </CardContent>
      </Card>
    );
  }

  if (data.length === 0 || !stats) {
    return (
      <Card className={className}>
        <CardContent className="pt-6">
          <div className="text-center py-4">
            <p className="text-sm text-muted-foreground">No data available</p>
          </div>
        </CardContent>
      </Card>
    );
  }

  return (
    <Card className={className}>
      <CardContent className="pt-6">
        <div className="space-y-6">
          {/* Transformation Example */}
          <div className="grid grid-cols-3 gap-4 items-center">
            {/* Complex Trace Example */}
            <div className="p-4 bg-red-50 border border-red-200 rounded-lg">
              <div className="flex items-center justify-between mb-3">
                <div className="flex items-center gap-2">
                  <FileText className="h-5 w-5 text-red-500" />
                  <span className="text-sm font-medium text-red-700">
                    Raw Agent Trace
                  </span>
                </div>
                <div className="bg-red-500 text-white text-xs rounded-full w-6 h-6 flex items-center justify-center font-bold">
                  {stats.complexityScore}
                </div>
              </div>

              {/* Example trace content */}
              <div className="bg-white p-3 rounded border text-xs font-mono">
                <div className="text-gray-800 mb-2">
                  <span className="text-blue-600">{"{"}</span>
                  <br />
                  <span className="ml-2">"agent_action": "web_search",</span>
                  <br />
                  <span className="ml-2">"tool_calls": [</span>
                  <br />
                  <span className="ml-4">{"{"} "function": "search",</span>
                  <br />
                  <span className="ml-6">"parameters": {"{"}</span>
                  <br />
                  <span className="ml-8">"query": "analyze data"</span>
                  <br />
                  <span className="ml-6">
                    {"}"} {"}"}
                  </span>
                  <br />
                  <span className="ml-2">],</span>
                  <br />
                  <span className="ml-2">"reasoning": "User needs...</span>
                  <br />
                  <span className="text-blue-600">{"}"}</span>
                </div>
                <div className="text-xs text-red-600 mt-2">
                  + 47 more nested objects...
                </div>
              </div>

              <div className="text-xs text-red-600 mt-2 text-center">
                Complexity {stats.complexityScore}/10 • Grade{" "}
                {stats.readabilityGrade}
              </div>
            </div>

            {/* Arrow */}
            <div className="text-center">
              <ArrowRight className="h-8 w-8 text-blue-500 mx-auto mb-2" />
              <div className="text-sm font-bold text-blue-600">AgentGraph</div>
              <div className="text-xs text-blue-500">Auto-transforms</div>
            </div>

            {/* Agent Graph Preview */}
            <div className="p-4 bg-green-50 border border-green-200 rounded-lg">
              <div className="flex items-center justify-between mb-3">
                <div className="flex items-center gap-2">
                  <div className="h-5 w-5 bg-green-500 rounded-sm flex items-center justify-center">
                    <div className="w-2 h-2 bg-white rounded-full"></div>
                  </div>
                  <span className="text-sm font-medium text-green-700">
                    Agent Graph
                  </span>
                </div>
                <div className="bg-green-500 text-white text-xs rounded-full w-6 h-6 flex items-center justify-center">
                  ✓
                </div>
              </div>

              {/* Example graph visualization */}
              <div className="bg-white p-3 rounded border">
                <div className="flex items-center justify-between mb-3">
                  <div className="flex items-center gap-2">
                    <div className="w-3 h-3 bg-blue-400 rounded-full"></div>
                    <span className="text-xs font-medium">User</span>
                  </div>
                  <ArrowRight className="h-3 w-3 text-gray-400" />
                  <div className="flex items-center gap-2">
                    <div className="w-3 h-3 bg-purple-400 rounded-full"></div>
                    <span className="text-xs font-medium">Agent</span>
                  </div>
                </div>

                <div className="flex items-center justify-center mb-2">
                  <ArrowRight className="h-3 w-3 text-gray-400 rotate-90" />
                </div>

                <div className="flex items-center gap-2 justify-center">
                  <div className="w-3 h-3 bg-green-400 rounded-full"></div>
                  <span className="text-xs font-medium">Search Tool</span>
                </div>
              </div>

              <div className="text-xs text-green-600 mt-2 text-center">
                Simplified to Grade 5 • 1/10 complexity
              </div>
            </div>
          </div>

          {/* Impact Metrics */}
          <div className="p-6 bg-gradient-to-r from-blue-50 to-blue-100 rounded-lg border border-blue-200">
            <div className="flex items-center justify-center gap-6">
              <div className="text-center">
                <div className="flex items-center justify-center gap-2 mb-2">
                  <Clock className="h-5 w-5 text-blue-600" />
                  <span className="text-lg font-bold text-blue-800">
                    {stats.timeSavedMinutes.toFixed(0)} min saved
                  </span>
                </div>
                <div className="text-xs text-blue-600">per trace</div>
              </div>

              <div className="w-px h-12 bg-blue-300"></div>

              <div className="text-center">
                <div className="flex items-center justify-center gap-2 mb-2">
                  <Zap className="h-5 w-5 text-blue-600" />
                  <span className="text-lg font-bold text-blue-800">
                    {stats.efficiencyMultiplier.toFixed(1)}× faster
                  </span>
                </div>
                <div className="text-xs text-blue-600">comprehension</div>
              </div>

              <div className="w-px h-12 bg-blue-300"></div>

              <div className="text-center">
                <div className="flex items-center justify-center gap-2 mb-2">
                  <div className="h-5 w-5 bg-red-500 text-white rounded-full text-xs flex items-center justify-center font-bold">
                    {stats.complexityScore}
                  </div>
                  <ArrowRight className="h-4 w-4 text-blue-500" />
                  <div className="h-5 w-5 bg-green-500 text-white rounded-full text-xs flex items-center justify-center font-bold">
                    1
                  </div>
                </div>
                <div className="text-xs text-blue-600">
                  complexity reduction
                </div>
              </div>
            </div>
          </div>

          {/* Complexity Scale Explanation */}
          <div className="p-3 bg-gray-50 rounded-lg border">
            <div className="text-center">
              <div className="text-sm font-medium text-gray-700 mb-2">
                Complexity Scale: What does "{stats.complexityScore}" mean?
              </div>
              <div className="flex items-center justify-center gap-2 text-xs text-gray-600">
                <span>1-3: Simple</span>
                <span>•</span>
                <span>4-6: Moderate</span>
                <span>•</span>
                <span className="font-medium text-red-600">7-10: Complex</span>
              </div>
            </div>
          </div>
        </div>
      </CardContent>
    </Card>
  );
}