var fs = require("fs");
var http = require("http");
var crypto = require("crypto");
var pathlib = require("path");
var urllib = require("url");

var Slideshow = require("./js/slideshow");
var fileserver = require("./js/fileserver");
var admin = require("./js/admin");
var error = require("./js/error");

var conf = JSON.parse(fs.readFileSync("conf.json"));
var index = fs.readFileSync("web/index.html", "utf-8")
	.replace(/<<transition_time>>/g, conf.transition_time);

var slideshow = Slideshow(conf.slides, conf.interval);
admin.init(slideshow);

function onexit(code) {
	console.log("exiting", code);
	slideshow.sendEvent("reload");
	process.exit();
}
process.on("exit", onexit);
process.on("SIGINT", onexit);
process.on("SIGTERM", onexit);

process.on("uncaughtException", onexit);

function handler(req, res) {
	var parts = urllib.parse(req.url);
	var pathname = parts.pathname;

	// Serve index.html (not part of fileserver because the
	// substitution of <<transition_time>>)
	if (pathname === "/") {
		res.end(index);

	// Send various files from web/ to the client
	} else if (fileserver.canServe(parts)) {
		fileserver.serve(parts, res);

	// /init: send initial information about current slide
	} else if (pathname === "/init") {
		res.end(slideshow.getSlideName());

	// /await: long polling, request won't end before a new slide comes
	} else if (pathname === "/await") {
		slideshow.pushAwaiter(res);

	// /admin/*: respond to admin queries
	} else if (admin.canServe(parts)) {
		admin.serve(parts, conf, req, res);

	// Serve slide files
	} else {
		slideshow.serve(parts, res);
	}
}

var server = http.createServer(handler);
server.on("error", err => {
	console.error(err);
	system.exit(1);
});
server.listen(conf.port);
console.log("Server running on port "+conf.port+".");