// Polygon API Worker 

const corsHeaders = {
  "Access-Control-Allow-Origin": "*",
  "Access-Control-Allow-Methods": "GET, OPTIONS",
  "Access-Control-Allow-Headers": "Content-Type",
};

export default {
  async fetch(request, env, ctx) {
    // Handle CORS preflight requests
    if (request.method === "OPTIONS") {
      return new Response(null, { headers: corsHeaders });
    }

    // Parse the URL from the incoming request
    const url = new URL(request.url);

    // Extract the ticker and dates from the request URL
    const ticker = url.searchParams.get("ticker");
    const startDate = url.searchParams.get("startDate");
    const endDate = url.searchParams.get("endDate");

    // Ensure necessary parameters are present
    if (!ticker || !startDate || !endDate) {
      return new Response("Missing required parameters", {
        status: 400,
        headers: corsHeaders,
      });
    }

    // Construct the Polygon API URL
    const polygonURL = `https://api.polygon.io/v2/aggs/ticker/${ticker}/range/1/day/${startDate}/${endDate}`;
    try {
      const polygonResponse = await fetch(
        `${polygonURL}?apiKey=${env.POLYGON_API_KEY}`
      );
      if (!polygonResponse.ok) {
        throw new Error('Failed to fetch data from Polygon API.');
      }
      // Parse response body as JSON and remove `request_id` for AI Gateway caching
      const data = await polygonResponse.json();
      delete data.request_id;

      return new Response(JSON.stringify(data), { headers: corsHeaders });
    } catch (e) {
      return new Response(e.message, { status: 500, headers: corsHeaders });
    }
  },
};