var http = require('http');
var models = require('../models');
var rpcConfig = require('../config/config')['rpc'];

const {username, password, hostname, port} = rpcConfig;

function MakeRPCRequest(postData) {
	return new Promise(function(resolve, reject) {
		var post_options = {
		  host: hostname,
		  port: port,
		  auth: `${username}:${password}`,
		  path: '/',
		  method: 'POST',
		  headers: {
		      'Content-Type': 'application/x-www-form-urlencoded',
		      'Content-Length': Buffer.byteLength(postData)
		  }
		};
		var post_req = http.request(post_options, function(res) {
			res.setEncoding("utf8");
			let body = "";
			res.on("data", data => {
				body += data;
			});
			res.on("end", () => {
				resolve(body);
			});
		});
		post_req.write(postData);
		post_req.end();
	});
}

async function saveTransaction(txid, blockHeight) {
	const res_tx = await MakeRPCRequest(JSON.stringify({
		method: 'getrawtransaction',
		params: [txid, 1],
		id: 1
	}));
	const tx = JSON.parse(res_tx)['result'];
	// console.log('tx:', tx);
	if (tx === null) {
		await models.Failure.create({
			msg: `${txid} fetching failed`,
		});
		return;
	}
	const transaction = await models.Transaction.create({
		txid: tx.txid,
		BlockHeight: blockHeight,
	});
	for (var i = 0; i < tx.vout.length; i++) {
		const vout = tx.vout[i];
		const m_vout = await models.Vout.create({
			value: vout.value,
		});
		for (var y = 0; y < vout.scriptPubKey.addresses.length; y++) {
			const address = vout.scriptPubKey.addresses[y];
			let m_address = await models.Address.findOne({
				where: {
					address,
				},
			});
			if (m_address === null) {
				m_address = await models.Address.create({
					address,
				});
			}
			await m_vout.addAddresses(m_address);
		}
		await transaction.addVouts(m_vout);
	}
	for (var i = 0; i < tx.vin.length; i++) {
		const vin = tx.vin[i];
		if (vin.txid) {
			const trans = await models.Transaction.findOne({
				where: {
					txid: vin.txid,
				},
			});
			if (trans) {
				await transaction.addTxtx(trans);
			}
		}
	}
}

async function syncNextBlock(syncedHeight) {
	const height = syncedHeight + 1;
	const res_hash = await MakeRPCRequest(JSON.stringify({
		method: 'getblockhash',
		params: [height],
		id: 1
	}));
	const blockHash = JSON.parse(res_hash)['result'];
	const res_block = await MakeRPCRequest(JSON.stringify({
		method: 'getblock',
		params: [blockHash],
		id: 1
	}));
	const block = JSON.parse(res_block)['result'];
	block.time = new Date(block.time * 1000);
	await models.Block.create(block);
	// console.log('block:', block);
	for (var i = 0; i < block.tx.length; i++) {
		await saveTransaction(block.tx[i], block.height);
	}

	return height;
}

async function getCurrentHeight() {
	const result = await MakeRPCRequest(JSON.stringify({
		method: 'getblockcount',
		params: [],
		id: 1
	}));

	return JSON.parse(result)['result'];
}

async function getSyncedHeight() {
	const result = await models.Block.findOne({
		attributes: ['height'],
		order: [['height', 'DESC']],
		limit: 1
	});
	const height = result ? result.height : -1;
	return height;
}

async function syncBlockchain() {
	let syncedHeight = await getSyncedHeight();
	console.log('\x1b[36m%s\x1b[0m', 'syncedHeight is', syncedHeight);

	let currentHeight = await getCurrentHeight();
	console.log('\x1b[36m%s\x1b[0m', 'currentHeight is', currentHeight);
	while (syncedHeight < currentHeight) {
		syncedHeight = await syncNextBlock(syncedHeight);
		console.log('\x1b[36m%s\x1b[0m', 'syncedHeight: ', syncedHeight)
	}
	process.exit(0);
}

var postData = JSON.stringify({
		  'method': 'getinfo',
		  'params': [],
		  'id': 1
		});

syncBlockchain();