export default {
  async fetch(request, env) {
    const corsHeaders = {
      "Access-Control-Allow-Origin": "*",
      "Access-Control-Allow-Methods": "POST, OPTIONS",
      "Access-Control-Allow-Headers": "Content-Type"
    };

    if (request.method === "OPTIONS") {
      return new Response(null, { headers: corsHeaders });
    }

    if (request.method !== "POST") {
      return new Response("OK", { status: 200, headers: corsHeaders });
    }

    const body = await request.json();
    const resp = await fetch("https://api.siliconflow.cn/v1/chat/completions", {
      method: "POST",
      headers: {
        "Content-Type": "application/json",
        "Authorization": `Bearer ${env.SILICONFLOW_API_KEY}`
      },
      body: JSON.stringify(body)
    });

    return new Response(resp.body, {
      status: resp.status,
      headers: { ...corsHeaders, "Content-Type": "application/json" }
    });
  }
};