import { Handlers } from "$fresh/server.ts";
import { Status, STATUS_TEXT } from "https://deno.land/std@0.195.0/http/mod.ts";
import { fromFileUrl, join } from "$std/path/mod.ts";


export const handler: Handlers = {
  async GET(req, ctx): Promise<Response> {
    const headers = new Headers({
        "content-type": "application/json"
    });
    const path = join(fromFileUrl(import.meta.url), "../../../../dist", `${ctx.params.name}.json`);
    console.log("path : ",path)
    let stat;
    try {
      stat = await Deno.stat(path);
    }
    catch(err){
      if(err instanceof Deno.errors.NotFound){
        return await ctx.renderNotFound();
      }
      else {
        throw err;
      }
    }
    const mtime = stat.mtime ?? new Date(0);
    const body = await Deno.readTextFile(path);
    headers.set("last-modified", mtime.toUTCString());

    const ifModifiedSinceValue = req.headers.get("if-modified-since");
    if ( ifModifiedSinceValue &&
        mtime.getTime() != new Date(ifModifiedSinceValue).getTime()
    ){
        return new Response(null, {
            status: Status.NotModified,
            statusText: STATUS_TEXT[Status.NotModified]
        })
    }
    return new Response(body, {headers});
  },
};