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

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

import RawCore from "../raw/api.ts";
import { ConnectionProps, ConnectionPropsDefault } from "./props.ts";
import { CoreRequest, CoreRequestSearchSentence, CoreRequestSearchTerms, CoreRequestUserTermPriority, CoreResponseSearchSentence, CoreResponseSearchTerms, CoreResponseUserTermPriority } from "./types.ts";


export default class RemoteCoreServer extends RawCore {
	private props: ConnectionProps;
	private handlers: Record<string, (req: CoreRequest) => Promise<Response>> = {
		"search.terms": async _req => {
			var req = _req as CoreRequestSearchTerms;
			var term = req.options?.term;
			if (!term) return new Response("", { status: 404 });
			return new Response(JSON.stringify({
				response: await this.search.terms(term),
			} as CoreResponseSearchTerms));
		},
		"search.sentence": async _req => {
			var req = _req as CoreRequestSearchSentence;
			var sentence = req.options?.sentence
			var optional = req.options?.optional;
			if (!sentence) return new Response("", { status: 404 });
			return new Response(JSON.stringify({
				response: await this.search.sentence(sentence, optional),
			} as CoreResponseSearchSentence));
		},
		"user.termPriority": async _req => {
			var req = _req as CoreRequestUserTermPriority;
			var ok = true;
			ok = ok && (typeof req.options?.userID === "number");
			ok = ok && !!(req.options?.expression);
			ok = ok && !!(req.options?.reading);
			ok = ok && (typeof req.options?.priority === "number");
			if (!ok) return new Response("", { status: 404 });
			await this.user.termPriority(req.options!.userID, req.options!.expression, req.options!.reading, req.options!.priority);
			return new Response(JSON.stringify({} as CoreResponseUserTermPriority));
		},
	};

	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 CoreRequest;
			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: () => { }
		});
	}
}