"use client";

import { useState, useRef } from "react";
import { Button } from "@/components/ui/button";
import { Upload, Trash2, CheckCircle2, AlertCircle, ExternalLink } from "lucide-react";

function formatBytes(bytes: number) {
  if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(1)} KB`;
  return `${(bytes / 1024 / 1024).toFixed(1)} MB`;
}

interface TestResult {
  key: string;
  streamUrl: string;
  filename: string;
  fileSize: number;
  uploadMs: number;
  expiresAt: string;
}

export default function StorageTestPage() {
  const [file, setFile] = useState<File | null>(null);
  const [uploading, setUploading] = useState(false);
  const [result, setResult] = useState<TestResult | null>(null);
  const [error, setError] = useState<string | null>(null);
  const [deleting, setDeleting] = useState(false);
  const inputRef = useRef<HTMLInputElement>(null);

  const handleUpload = async () => {
    if (!file) return;
    setUploading(true);
    setError(null);
    setResult(null);

    const formData = new FormData();
    formData.append("file", file);

    try {
      const res = await fetch("/api/storage-test", {
        method: "POST",
        body: formData,
      });
      const data = await res.json();
      if (!res.ok) throw new Error(data.error ?? "Upload failed");
      setResult(data);
    } catch (e: unknown) {
      setError(e instanceof Error ? e.message : "Upload failed");
    } finally {
      setUploading(false);
    }
  };

  const handleDelete = async () => {
    if (!result) return;
    setDeleting(true);
    try {
      const res = await fetch(`/api/storage-test?key=${encodeURIComponent(result.key)}`, {
        method: "DELETE",
      });
      if (!res.ok) {
        const data = await res.json();
        throw new Error(data.error ?? "Delete failed");
      }
      setResult(null);
      setFile(null);
      if (inputRef.current) inputRef.current.value = "";
    } catch (e: unknown) {
      setError(e instanceof Error ? e.message : "Delete failed");
    } finally {
      setDeleting(false);
    }
  };

  return (
    <div className="p-6 max-w-3xl space-y-6">
      <div>
        <h1 className="text-xl font-semibold">Object Storage Playback Test</h1>
        <p className="text-sm text-muted-foreground mt-1">
          Upload a video to Hetzner object storage and play it back directly. Use this to compare
          streaming performance against the local file server.
        </p>
      </div>

      {/* Upload */}
      <div className="rounded-lg border border-border p-4 space-y-3">
        <div
          className="border-2 border-dashed border-border rounded-md p-8 text-center cursor-pointer hover:border-primary/40 transition-colors"
          onClick={() => inputRef.current?.click()}
        >
          <Upload className="h-8 w-8 mx-auto mb-2 text-muted-foreground" />
          {file ? (
            <p className="text-sm font-medium">
              {file.name}{" "}
              <span className="text-muted-foreground">({formatBytes(file.size)})</span>
            </p>
          ) : (
            <p className="text-sm text-muted-foreground">Click to select a video file</p>
          )}
          <input
            ref={inputRef}
            type="file"
            accept="video/*"
            className="hidden"
            onChange={(e) => {
              setFile(e.target.files?.[0] ?? null);
              setResult(null);
              setError(null);
            }}
          />
        </div>

        <Button onClick={handleUpload} disabled={!file || uploading} className="w-full">
          {uploading ? "Uploading to Hetzner…" : "Upload & Test Playback"}
        </Button>
      </div>

      {/* Error */}
      {error && (
        <div className="flex items-center gap-2 text-sm text-red-400 rounded-md border border-red-500/20 bg-red-500/10 px-3 py-2">
          <AlertCircle className="h-4 w-4 shrink-0" />
          {error}
        </div>
      )}

      {/* Result */}
      {result && (
        <div className="space-y-4">
          <div className="flex items-center gap-2 text-sm text-emerald-400 rounded-md border border-emerald-500/20 bg-emerald-500/10 px-3 py-2">
            <CheckCircle2 className="h-4 w-4 shrink-0" />
            <span>
              Uploaded in <strong>{result.uploadMs}ms</strong> · {formatBytes(result.fileSize)} ·
              URL expires at {new Date(result.expiresAt).toLocaleTimeString()}
            </span>
          </div>

          {/* Player */}
          <div className="rounded-lg overflow-hidden bg-black border border-border aspect-video">
            <video
              key={result.streamUrl}
              src={result.streamUrl}
              controls
              className="w-full h-full"
              preload="metadata"
            />
          </div>

          {/* URL + cleanup */}
          <div className="flex items-start gap-2">
            <code className="flex-1 text-xs text-muted-foreground bg-muted rounded px-2 py-1.5 break-all select-all">
              {result.streamUrl}
            </code>
            <a
              href={result.streamUrl}
              target="_blank"
              rel="noopener noreferrer"
              title="Open URL directly"
              className="shrink-0 p-1.5 rounded border border-border hover:bg-muted transition-colors"
            >
              <ExternalLink className="h-4 w-4 text-muted-foreground" />
            </a>
          </div>

          <Button
            variant="outline"
            size="sm"
            className="gap-1.5 text-red-400 border-red-500/30 hover:bg-red-500/10"
            onClick={handleDelete}
            disabled={deleting}
          >
            <Trash2 className="h-3.5 w-3.5" />
            {deleting ? "Deleting…" : "Delete test file from Hetzner"}
          </Button>
        </div>
      )}
    </div>
  );
}