import { NextRequest, NextResponse } from 'next/server';
import { localStorage } from '@/lib/local-storage';
import path from 'path';

export async function GET(request: NextRequest, { params }: { params: Promise<{ path: string[] }> }) {
  try {
    const { path: pathSegments } = await params;
    const filePath = normalizeStoragePath(pathSegments.join('/'));
    if (!filePath) {
      return NextResponse.json({ error: 'Invalid file path' }, { status: 400 });
    }
    
    if (!localStorage.fileExists(filePath)) {
      return NextResponse.json({ error: 'File not found' }, { status: 404 });
    }
    
    const fileBuffer = localStorage.readFile(filePath);
    const contentType = getContentType(filePath);
    
    return new NextResponse(new Uint8Array(fileBuffer), {
      headers: {
        'Content-Type': contentType,
        'Content-Disposition': `inline; filename="${path.basename(filePath)}"`,
      },
    });
  } catch (error) {
    console.error('[Local Storage API] Error:', error);
    return NextResponse.json({ error: 'Internal server error' }, { status: 500 });
  }
}

function normalizeStoragePath(value: string): string | null {
  try {
    const decoded = decodeURIComponent(value);
    const normalized = path.posix.normalize(decoded).replace(/^\/+/, '');
    if (!normalized || normalized.startsWith('..') || normalized.includes('/../') || path.isAbsolute(normalized)) {
      return null;
    }
    return normalized;
  } catch {
    return null;
  }
}

function getContentType(filePath: string): string {
  const extension = filePath.split('.').pop()?.toLowerCase();
  
  const contentTypeMap: Record<string, string> = {
    'jpg': 'image/jpeg',
    'jpeg': 'image/jpeg',
    'png': 'image/png',
    'webp': 'image/webp',
    'gif': 'image/gif',
    'mp4': 'video/mp4',
    'avi': 'video/x-msvideo',
    'mov': 'video/quicktime',
    'wmv': 'video/x-ms-wmv',
    'pdf': 'application/pdf',
    'txt': 'text/plain',
    'json': 'application/json',
  };
  
  return contentTypeMap[extension || ''] || 'application/octet-stream';
}