import { NextRequest, NextResponse } from 'next/server';

/**
 * 通用的 API 代理路由
 */
export async function GET(
  request: NextRequest,
  { params }: { params: Promise<{ path: string[] }> }
) {
  const { path } = await params;
  const targetPath = path.join('/');
  const searchParams = request.nextUrl.search;
  const targetUrl = `http://localhost:8000/api/${targetPath}${searchParams}`;

  const headers: Record<string, string> = {};
  request.headers.forEach((value, key) => {
    if (key.toLowerCase() !== 'host') {
      headers[key] = value;
    }
  });

  try {
    const response = await fetch(targetUrl, { headers });
    
    // 先检查 Content-Type，确保是 JSON
    const contentType = response.headers.get('content-type');
    if (contentType && contentType.includes('application/json')) {
      const data = await response.json();
      return NextResponse.json(data, { status: response.status });
    } else {
      const text = await response.text();
      return new NextResponse(text, { 
        status: response.status,
        headers: { 'content-type': contentType || 'text/plain' }
      });
    }
  } catch (error) {
    console.error('GET proxy error:', error);
    return NextResponse.json({ detail: 'Proxy error', error: String(error) }, { status: 502 });
  }
}

export async function POST(
  request: NextRequest,
  { params }: { params: Promise<{ path: string[] }> }
) {
  const { path } = await params;
  const targetPath = path.join('/');
  const searchParams = request.nextUrl.search;
  const targetUrl = `http://localhost:8000/api/${targetPath}${searchParams}`;
  const body = await request.text();

  const headers: Record<string, string> = {};
  request.headers.forEach((value, key) => {
    if (key.toLowerCase() !== 'host') {
      headers[key] = value;
    }
  });

  try {
    const response = await fetch(targetUrl, {
      method: 'POST',
      headers,
      body,
    });
    
    // 先检查 Content-Type，确保是 JSON
    const contentType = response.headers.get('content-type');
    if (contentType && contentType.includes('application/json')) {
      const data = await response.json();
      return NextResponse.json(data, { status: response.status });
    } else {
      const text = await response.text();
      return new NextResponse(text, { 
        status: response.status,
        headers: { 'content-type': contentType || 'text/plain' }
      });
    }
  } catch (error) {
    console.error('POST proxy error:', error);
    return NextResponse.json({ detail: 'Proxy error', error: String(error) }, { status: 502 });
  }
}

export async function PUT(
  request: NextRequest,
  { params }: { params: Promise<{ path: string[] }> }
) {
  const { path } = await params;
  const targetPath = path.join('/');
  const searchParams = request.nextUrl.search;
  const targetUrl = `http://localhost:8000/api/${targetPath}${searchParams}`;
  const body = await request.text();

  const headers: Record<string, string> = {};
  request.headers.forEach((value, key) => {
    if (key.toLowerCase() !== 'host') {
      headers[key] = value;
    }
  });

  try {
    const response = await fetch(targetUrl, {
      method: 'PUT',
      headers,
      body,
    });
    
    const contentType = response.headers.get('content-type');
    if (contentType && contentType.includes('application/json')) {
      const data = await response.json();
      return NextResponse.json(data, { status: response.status });
    } else {
      const text = await response.text();
      return new NextResponse(text, { 
        status: response.status,
        headers: { 'content-type': contentType || 'text/plain' }
      });
    }
  } catch (error) {
    console.error('PUT proxy error:', error);
    return NextResponse.json({ detail: 'Proxy error', error: String(error) }, { status: 502 });
  }
}

export async function PATCH(
  request: NextRequest,
  { params }: { params: Promise<{ path: string[] }> }
) {
  const { path } = await params;
  const targetPath = path.join('/');
  const searchParams = request.nextUrl.search;
  const targetUrl = `http://localhost:8000/api/${targetPath}${searchParams}`;
  const body = await request.text();

  const headers: Record<string, string> = {};
  request.headers.forEach((value, key) => {
    if (key.toLowerCase() !== 'host') {
      headers[key] = value;
    }
  });

  try {
    const response = await fetch(targetUrl, {
      method: 'PATCH',
      headers,
      body,
    });
    
    const contentType = response.headers.get('content-type');
    if (contentType && contentType.includes('application/json')) {
      const data = await response.json();
      return NextResponse.json(data, { status: response.status });
    } else {
      const text = await response.text();
      return new NextResponse(text, { 
        status: response.status,
        headers: { 'content-type': contentType || 'text/plain' }
      });
    }
  } catch (error) {
    console.error('PATCH proxy error:', error);
    return NextResponse.json({ detail: 'Proxy error', error: String(error) }, { status: 502 });
  }
}

export async function DELETE(
  request: NextRequest,
  { params }: { params: Promise<{ path: string[] }> }
) {
  const { path } = await params;
  const targetPath = path.join('/');
  const searchParams = request.nextUrl.search;
  const targetUrl = `http://localhost:8000/api/${targetPath}${searchParams}`;

  const headers: Record<string, string> = {};
  request.headers.forEach((value, key) => {
    if (key.toLowerCase() !== 'host') {
      headers[key] = value;
    }
  });

  try {
    const response = await fetch(targetUrl, {
      method: 'DELETE',
      headers,
    });
    
    const contentType = response.headers.get('content-type');
    if (contentType && contentType.includes('application/json')) {
      const data = await response.json();
      return NextResponse.json(data, { status: response.status });
    } else {
      const text = await response.text();
      return new NextResponse(text, { 
        status: response.status,
        headers: { 'content-type': contentType || 'text/plain' }
      });
    }
  } catch (error) {
    console.error('DELETE proxy error:', error);
    return NextResponse.json({ detail: 'Proxy error', error: String(error) }, { status: 502 });
  }
}