import { serve } from "https://deno.land/std@0.192.0/http/server.ts";

import "../../util/string.ts";

import { ParseResult } from "../../language/types.ts";
import YomikunRAWAPI from "../raw/api.ts";
import { ConnectionProps, ConnectionPropsDefault } from "./props.ts";
import { APIRequest, APIRequestParseSentence, APIResponseParseSentence } from "./types.ts";


export default class YomikunRemoteAPIServer extends YomikunRAWAPI {
	private props: ConnectionProps;
	private handlers: Record<string, (req: APIRequest) => Promise<Response>> = {
		parseSentence: async _req => {
			var req = _req as APIRequestParseSentence;
			var input = req.options?.input
			if (!input) return new Response("", { status: 404 });
			return new Response(JSON.stringify({
				command: "parseSentence",
				response: await this.parseSentence(input),
			} as APIResponseParseSentence));
		},
	};

	constructor(options?: ConnectionProps) {
		super();
		this.props = { ...ConnectionPropsDefault, ...options };
	}

	async start() {
		serve(async (req) => {
			if (req.method != "POST") return new Response("", { status: 400 }); // wrong request (not post)
			var request = (await req.text()).json({}) as APIRequest;
			if (!request.command) return new Response("", { status: 400 }); // wrong request (no command)
			var handler = this.handlers[request.command];
			if (!handler) return new Response("", { status: 404 }); // not found (unknown command)
			return await handler(request);
		}, {
			port: this.props.port,
			onListen: () => { }
		});
	}
}