import path from 'path';
import {Server} from 'http';
import Koa from 'koa';
import serve from 'koa-static';
import logger from 'koa-logger';
import convert from 'koa-convert';
import conditional from 'koa-conditional-get';
import etag from 'koa-etag';
import prerender from 'koa-prerender';
import helmet from 'koa-helmet';
import mount from 'koa-mount';
import bodyParser from 'koa-bodyparser';

import apiV1 from 'hudozka-api-v1';
import config, {redirectionTable} from './config';
import {routes, queryObject} from './routes';
import {redirect} from './routes/redirect';
import {services as serviceKeys, authChecker} from './core/service';
import handlebars from 'handlebars';

const dirPublic = path.join(__dirname, '../public');
const dirTemplates = path.join(__dirname, 'templates');

handlebars.registerHelper('raw-helper', options => options.fn());

export default function (store) {
	const $ = convert;

	const app = new Koa();
	app.proxy = true;

	app.use(bodyParser({
		extendTypes: {
			json: 'application/ejson'
		}
	}));
	app.use(logger());
	app.use(apis(store));
	app.use($(conditional()));
	app.use($(etag()));
	app.use(prerenderRmFragment());
	app.use($(prerender(config.prerender)));
	app.use(serve(dirPublic));
	app.use(serve(dirTemplates));
	app.use($(redirect(redirectionTable)));
	app.use($(helmet()));
	app.use(queryObject());
	app.use(routes());

	return Server(app.callback());
}

function apis(store) {
	let checkAuth = authChecker(serviceKeys);
	return mount('/api/v1', apiV1(checkAuth, store));
}

function prerenderRmFragment() {
	return async(ctx, next) => {
		await next();

		try {
			let xp = ctx.response.header['x-prerender'] === 'true';
			if (xp) ctx.body = ctx.body.replace('<meta name="fragment" content="!">', '');
		} catch (e) {
		}
	}
}