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

// resolve image proxy
export async function GET(request: NextRequest) {
  try {
    const { searchParams } = new URL(request.url);
    const imageUrl = searchParams.get("url");

    if (!imageUrl) {
      console.error("缺少图片URL参数");
      return NextResponse.json({ error: "缺少图片URL参数" }, { status: 400 });
    }

    let parsedUrl;
    try {
      parsedUrl = new URL(imageUrl);
    } catch (e) {
      console.error(`图片URL格式不正确: ${imageUrl}`);
      return NextResponse.json({ error: "图片URL格式不正确" }, { status: 400 });
    }

    if (parsedUrl.protocol !== "http:" && parsedUrl.protocol !== "https:") {
      console.error(`不支持的URL协议: ${parsedUrl.protocol}`);
      return NextResponse.json(
        { error: "只支持HTTP和HTTPS协议" },
        { status: 400 }
      );
    }

    let response;
    try {
      response = await fetch(imageUrl, {
        headers: {
          // 模拟浏览器请求
          "User-Agent":
            "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36",
          Accept:
            "image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
          "Accept-Language": "zh-CN,zh;q=0.9,en;q=0.8",
          Referer: parsedUrl.origin,
        },
      });
    } catch (error: any) {
      console.error(`获取图片失败: ${error.message || "未知错误"}`);
      return NextResponse.json(
        { error: `获取图片失败: ${error.message || "未知错误"}` },
        { status: 500 }
      );
    }

    // 检查响应状态
    if (!response.ok) {
      console.error(
        `图片服务器返回错误: ${response.status} ${response.statusText}`
      );
      return NextResponse.json(
        { error: `获取图片失败: ${response.status} ${response.statusText}` },
        { status: response.status }
      );
    }

    let imageBuffer;
    try {
      imageBuffer = await response.arrayBuffer();
      console.log(`成功获取图片，大小: ${imageBuffer.byteLength} 字节`);
    } catch (error: any) {
      console.error(`读取图片内容失败: ${error.message || "未知错误"}`);
      return NextResponse.json(
        { error: `读取图片内容失败: ${error.message || "未知错误"}` },
        { status: 500 }
      );
    }

    if (imageBuffer.byteLength === 0) {
      console.error("图片内容为空");
      return NextResponse.json({ error: "图片内容为空" }, { status: 400 });
    }

    const contentType = response.headers.get("content-type") || "image/jpeg";

    return new NextResponse(imageBuffer, {
      headers: {
        "Content-Type": contentType,
        "Cache-Control":
          "no-store, no-cache, must-revalidate, proxy-revalidate",
        Pragma: "no-cache",
        Expires: "0",
        "Surrogate-Control": "no-store",
        "Access-Control-Allow-Origin": "*",
        "Access-Control-Allow-Methods": "GET, OPTIONS",
        "Access-Control-Allow-Headers": "Content-Type",
      },
    });
  } catch (error: any) {
    console.error("图片代理未处理的错误:", error);
    return NextResponse.json(
      { error: `处理图片请求时出错: ${error.message || "未知错误"}` },
      { status: 500 }
    );
  }
}
export const runtime = "edge";