'use client';

import { useState, useEffect } from 'react';
import { useRouter } from 'next/navigation';
import { Button } from '@/components/ui/button';
import { Loader2, TrendingUp } from 'lucide-react';
import VideoPlayerSection from '@/components/video-player-section';
import { PageHeader } from '@/components/page-header';
import { PoweredBy } from '@/components/powered-by';
import { sessionService } from '@/services/api';
import { SessionContext, DetectionData, DetectionType } from '@/types';
import { clearVideoFile } from '@/lib/video-storage';
import { ROUTES } from '@/utils/routes';
import { Card } from '@/components/ui/card';

export default function ResultsPage() {
  const router = useRouter();
  const [session, setSession] = useState<SessionContext | null>(null);
  const [detectionData] = useState<DetectionData | null>(null);
  const [detectionType] = useState<DetectionType>('pothole-detection');
  const [videoId] = useState<string | null>(null);
  const [videoFile] = useState<File | null>(null);
  const [isLoading] = useState(true);
  const [error] = useState<string | null>(null);

  // Load session and video data on mount
  useEffect(() => {
    const storedSession = sessionService.loadSession();
    const videoData = sessionService.loadVideoData();

    if (!sessionService.isSessionValid(storedSession) || !videoData) {
      router.replace(ROUTES.UPLOAD);
      return;
    }

    // If we have a videoId, redirect to the dynamic results page
    if (videoData.videoId) {
      router.replace(`${ROUTES.RESULTS}/${videoData.videoId}`);
      return;
    }

    setSession(storedSession);
  }, [router]);

  const handleNewAnalysis = async () => {
    // Clear video from IndexedDB
    if (videoId) {
      try {
        await clearVideoFile(videoId);
      } catch (err) {
        console.error('Failed to clear video file:', err);
      }
    }
    sessionService.clearSession();
    router.push(ROUTES.UPLOAD);
  };

  const getTitle = () => {
    if (detectionType === 'pothole-detection') return 'Pothole Detection Results';
    if (detectionType === 'sign-board-detection') return 'Signboard Detection Results';
    return 'Pothole & Signboard Detection Results';
  };

  if (isLoading) {
    return (
      <div className="min-h-screen flex items-center justify-center">
        <Card className="flex flex-col items-center gap-4 p-8">
          <Loader2 className="h-8 w-8 animate-spin text-primary" />
          <p className="text-sm text-muted-foreground">Loading results...</p>
        </Card>
      </div>
    );
  }

  if (error) {
    return (
      <div className="min-h-screen flex items-center justify-center">
        <Card className="flex flex-col items-center gap-6 p-8 text-center max-w-md">
          <p className="text-destructive font-medium">{error}</p>
          <Button onClick={handleNewAnalysis}>Start New Analysis</Button>
        </Card>
      </div>
    );
  }

  return (
    <div className="min-h-screen">
      <main className="min-h-screen">
        <div className="container mx-auto px-6 py-10 max-w-[1600px]">
          <div className="mb-8">
            <PageHeader
              title={getTitle()}
              description="View your AI-powered road analysis results"
              icon={TrendingUp}
            />
          </div>

          {session && (
            <div className="mb-6">
              <Card className="p-0 border shadow-sm overflow-hidden">
                <div className="flex flex-col md:flex-row md:items-center justify-between py-4 px-6 gap-6 bg-card">
                  <div className="flex flex-wrap items-center gap-x-12 gap-y-4">
                    <div className="flex flex-col">
                      <span className="text-[10px] font-bold uppercase tracking-widest text-muted-foreground mb-1.5">
                        Project
                      </span>
                      <span className="text-base font-bold leading-tight">
                        {session.projectName}
                      </span>
                    </div>
                    <div className="flex flex-col border-l pl-12 border-border/60">
                      <span className="text-[10px] font-bold uppercase tracking-widest text-muted-foreground mb-1.5">
                        Package
                      </span>
                      <span className="text-sm font-semibold text-muted-foreground leading-tight">
                        {session.packageName}
                      </span>
                    </div>
                    <div className="flex flex-col border-l pl-12 border-border/60">
                      <span className="text-[10px] font-bold uppercase tracking-widest text-muted-foreground mb-1.5">
                        Segment
                      </span>
                      <span className="text-sm font-semibold text-muted-foreground leading-tight">
                        {session.chainageName}
                      </span>
                    </div>
                  </div>
                  <Button
                    onClick={handleNewAnalysis}
                    variant="outline"
                    size="sm"
                    className="font-semibold px-6 shrink-0 h-9"
                  >
                    Start New Analysis
                  </Button>
                </div>
              </Card>
            </div>
          )}

          {detectionData && videoId && (
            <VideoPlayerSection
              data={detectionData}
              videoId={videoId}
              videoFile={videoFile}
              detectionType={detectionType}
              projectId={session?.projectId || undefined}
            />
          )}
          <PoweredBy />
        </div>
      </main>
    </div>
  );
}