import React from "react";
import {
  Card,
  CardContent,
  CardDescription,
  CardHeader,
  CardTitle,
} from "@/components/ui/card";
import { Button } from "@/components/ui/button";
import { Upload, FileText, GitBranch, Shield } from "lucide-react";

export function WelcomeView() {
  return (
    <div className="flex-1 p-8">
      <div className="max-w-4xl mx-auto space-y-8">
        {/* Header */}
        <div className="text-center space-y-4">
          <h1 className="text-4xl font-bold tracking-tight">
            Welcome to AI Pipeline Explorer
          </h1>
          <p className="text-xl text-muted-foreground max-w-2xl mx-auto">
            Analyze AI agent traces, build knowledge graphs, and perform causal
            analysis with our comprehensive pipeline processing system.
          </p>
        </div>

        {/* Quick Start */}
        <Card>
          <CardHeader>
            <CardTitle>Quick Start</CardTitle>
            <CardDescription>
              Get started by uploading a trace file to begin analysis
            </CardDescription>
          </CardHeader>
          <CardContent>
            <div className="flex items-center gap-4">
              <Button size="lg" className="gap-2">
                <Upload className="h-4 w-4" />
                Upload Your First Trace
              </Button>
              <span className="text-sm text-muted-foreground">
                Supports JSON, TXT, and LOG files
              </span>
            </div>
          </CardContent>
        </Card>

        {/* Features */}
        <div className="grid grid-cols-1 md:grid-cols-3 gap-6">
          <Card>
            <CardHeader>
              <CardTitle className="flex items-center gap-2">
                <FileText className="h-5 w-5 text-primary" />
                Trace Analysis
              </CardTitle>
            </CardHeader>
            <CardContent>
              <p className="text-sm text-muted-foreground">
                Upload and analyze AI agent execution traces to understand
                behavior patterns and decision-making processes.
              </p>
            </CardContent>
          </Card>

          <Card>
            <CardHeader>
              <CardTitle className="flex items-center gap-2">
                <GitBranch className="h-5 w-5 text-primary" />
                Agent Graphs
              </CardTitle>
            </CardHeader>
            <CardContent>
              <p className="text-sm text-muted-foreground">
                Automatically generate agent graphs from trace data to visualize
                relationships and dependencies.
              </p>
            </CardContent>
          </Card>

          <Card>
            <CardHeader>
              <CardTitle className="flex items-center gap-2">
                <Shield className="h-5 w-5 text-primary" />
                Pipeline Processing
              </CardTitle>
            </CardHeader>
            <CardContent>
              <p className="text-sm text-muted-foreground">
                Run comprehensive analysis pipelines including perturbation
                testing and causal analysis.
              </p>
            </CardContent>
          </Card>
        </div>

        {/* Recent Activity */}
        <Card>
          <CardHeader>
            <CardTitle>Recent Activity</CardTitle>
            <CardDescription>
              Your recent traces and analysis results
            </CardDescription>
          </CardHeader>
          <CardContent>
            <div className="text-center py-8">
              <FileText className="h-12 w-12 mx-auto mb-4 text-muted-foreground" />
              <p className="text-muted-foreground">
                No recent activity. Upload a trace to get started.
              </p>
            </div>
          </CardContent>
        </Card>
      </div>
    </div>
  );
}