'use client';

import { useEffect, useState, use } from 'react';
import Link from 'next/link';
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
import { Badge } from '@/components/ui/badge';
import { Skeleton } from '@/components/ui/skeleton';
import { Alert, AlertDescription, AlertTitle } from '@/components/ui/alert';
import { AnalyzeButton } from '@/components/analyzer/analyze-button';
import { Sparkles } from 'lucide-react';
import type { PersistedAnalysis } from '@/lib/types/analyzer';

export default function TicketAnalyzerPage({
  params,
}: {
  params: Promise<{ ticketNumber: string }>;
}) {
  const { ticketNumber } = use(params);
  const [analyses, setAnalyses] = useState<PersistedAnalysis[] | null>(null);
  const [error, setError] = useState<string | null>(null);

  useEffect(() => {
    let cancelled = false;
    (async () => {
      try {
        const res = await fetch(
          `/api/analyzer/tickets/${encodeURIComponent(ticketNumber)}/analyses`
        );
        if (!res.ok) {
          const data = (await res.json().catch(() => ({}))) as { error?: string };
          throw new Error(data.error ?? `Request failed: ${res.status}`);
        }
        const { analyses } = (await res.json()) as { analyses: PersistedAnalysis[] };
        if (!cancelled) setAnalyses(analyses);
      } catch (err) {
        if (!cancelled) setError(err instanceof Error ? err.message : 'Unknown error');
      }
    })();
    return () => {
      cancelled = true;
    };
  }, [ticketNumber]);

  const latest = analyses?.[0];

  return (
    <div className="container mx-auto px-6 py-6 max-w-4xl space-y-6">
      <Card>
        <CardHeader>
          <div className="flex items-start justify-between gap-4 flex-wrap">
            <div className="space-y-1">
              <p className="text-sm text-muted-foreground">Ticket</p>
              <CardTitle className="font-mono">{ticketNumber}</CardTitle>
            </div>
            <AnalyzeButton ticketNumber={ticketNumber} />
          </div>
        </CardHeader>
        <CardContent>
          <p className="text-sm text-muted-foreground">
            Click <strong>Analyze</strong> to run the AI pipeline. If a current
            analysis already exists, you&rsquo;ll be navigated straight to it.
            Otherwise the run takes ~10–60 seconds.
          </p>
        </CardContent>
      </Card>

      {error && (
        <Alert variant="destructive">
          <AlertTitle>Couldn&rsquo;t load analysis history</AlertTitle>
          <AlertDescription>{error}</AlertDescription>
        </Alert>
      )}

      <Card>
        <CardHeader>
          <CardTitle className="text-base">Analysis history</CardTitle>
        </CardHeader>
        <CardContent>
          {analyses === null && !error ? (
            <div className="space-y-2">
              <Skeleton className="h-12 w-full" />
              <Skeleton className="h-12 w-full" />
            </div>
          ) : analyses && analyses.length === 0 ? (
            <p className="text-sm text-muted-foreground">
              No analyses yet. Run one above.
            </p>
          ) : (
            <ul className="divide-y">
              {(analyses ?? []).map((a) => (
                <li key={a.id} className="py-3 flex items-center justify-between gap-4">
                  <div className="min-w-0">
                    <Link
                      href={`/analyzer/analysis/${a.id}`}
                      className="font-medium hover:underline flex items-center gap-2"
                    >
                      <Sparkles className="w-4 h-4" />
                      Version {a.analysisVersion}
                      {latest?.id === a.id && (
                        <Badge variant="secondary" className="text-xs">
                          latest
                        </Badge>
                      )}
                      {a.needsHumanReview && (
                        <Badge variant="destructive" className="text-xs">
                          Needs review
                        </Badge>
                      )}
                    </Link>
                    <p className="text-xs text-muted-foreground mt-1">
                      {new Date(a.triggeredAt).toLocaleString()}
                      {' · '}
                      {a.opusUsed ? 'Haiku → Sonnet → Opus' : a.sonnetUsed ? 'Haiku → Sonnet' : 'Haiku'}
                      {' · '}${a.estimatedCostUsd.toFixed(4)}
                    </p>
                  </div>
                  {a.confidenceScore !== null && (
                    <Badge variant="outline">
                      {Math.round(a.confidenceScore * 100)}%
                    </Badge>
                  )}
                </li>
              ))}
            </ul>
          )}
        </CardContent>
      </Card>
    </div>
  );
}