const fs = require("fs");
const uuidv4 = require("uuid/v4");
const crypto = require("crypto");
const request = require("request");
const express = require("express");
const app = express();

const baseURL = process.env.BASE_URL || "new.shadowfacts.net";

// const alreadyPosted = loadAlreadyPosted();

// function loadAlreadyPosted() {
// 	const buffer = fs.readFileSync("data/already-posted.json");
// 	const data = buffer.toString();
// 	return JSON.parse(data);
// }

// function exitHandler() {
// 	const data = JSON.stringify(alreadyPosted);
// 	fs.writeFileSync("data/already-posted.json", data);
// }
// process.on("exit", exitHandler);
// process.on("SIGINT", exitHandler);

app.use(require("morgan")("dev"));

app.get("/ap", (req, res) => {
	res.end("Hello, world!");
});

app.get("/ap/actor", (req, res) => {
	if (req.accepts(["application/activity+json", "application/ld+json"])) {
		res.sendFile("actor.json");
	} else {
		res.redirect("/");
	}
});


// const port = process.env.PORT || 8083;
// app.listen(port, () => {
// 	console.log(`Listening on ${port}`);
// });

function createMessage(object) {
	const uuid = uuidv4();

	return {
		"@context": "https://www.w3.org/ns/activitystreams",
		"id": `https://${baseURL}/ap/${uuid}`,
		"type": "Create",
		"actor": `https://${baseURL}/ap/actor`,
		"object": object
	};
}

function signAndSendMessage(message, targetDomain, inbox) {
	const inboxFragment = inbox.replace("https://" + targetDomain, "");
	const privKey = fs.readFileSync("/Users/shadowfacts/Desktop/private.pem").toString();
	const signer = crypto.createSign("sha256");
	const date = new Date();
	let stringToSign = `(request-target): post ${inboxFragment}\nhost: ${targetDomain}\ndate: ${date.toUTCString()}`;
	signer.update(stringToSign);
	signer.end();
	const signature = signer.sign(privKey);
	const base64Signature = signature.toString("base64");
	const header = `keyId="https://${baseURL}/ap/actor#main-key",headers="(request-target) host date",signature="${base64Signature}"`;
	request({
		url: inbox,
		headers: {
			"Host": targetDomain,
			"Date": date.toUTCString(),
			"Signature": header,
			"Accept": "application/activity+json"
		},
		method: "POST",
		json: true,
		body: message
	}, (err, res) => {
		console.log("Sent message to an inbox at", targetDomain);
		if (err) console.log("Error:", error, res);
		console.log("Response status code: ", res.statusCode)
	});	
}

// const message = createMessage({"@context":["https://www.w3.org/ns/activitystreams"],"type":"Article","id":"https://new.shadowfacts.net/meta/2019/reincarnation.json","published":"2019-01-02T23:02:42.000Z","inReplyTo":null,"url":"https://new.shadowfacts.net/meta/2019/reincarnation/","attributedTo":"https://new.shadowfacts.net/ap/actor","to":["https://www.w3.org/ns/activitystreams#Public"],"cc":[],"name":"Reincarnation","content":"<figure>\n    <img src=\"https://theinfosphere.org/images/9/93/Reincarnation_infobox.png\" alt=\"Futurama Galactic Entity image\" />\n    <figcaption>A wise man once said that nothing really dies, it just comes back in a new form. Then he died.</figcaption>\n</figure>\n<p>Stand by for <em><strong>reincarnation</strong></em>.</p>\n<!-- excerpt-end -->\n<p><code>// TODO: write the actual blog post</code></p>\n"});
// console.log(message);
// signAndSendMessage(message, "social.shadowfacts.net", "https://social.shadowfacts.net/users/shadowfacts/inbox");