let async = require('async');
let apiInterfaces = require('./apiInterfaces.js')(config.daemon, config.wallet, config.api);
let lastHash;
let POOL_NONCE_SIZE = 16 + 1; // +1 for old XMR/new TRTL bugs

let logSystem = 'childDaemon'
require('./exceptionWriter.js')(logSystem);


let pool = config.childPools[process.env.poolId];

let blockData = JSON.stringify({
	id: "0",
	jsonrpc: "2.0",
	method: 'getlastblockheader',
	params: {}
})

let templateData = JSON.stringify({
	id: "0",
	jsonrpc: "2.0",
	method: 'getblocktemplate',
	params: {
		reserve_size: POOL_NONCE_SIZE,
		wallet_address: pool.poolAddress
	}
})


function runInterval () {
	async.waterfall([
			function (callback) {
				apiInterfaces.jsonHttpRequest(pool.childDaemon.host, pool.childDaemon.port, blockData, function (err, res) {
					if (err) {
						log('error', logSystem, '%s error from daemon', [pool.coin]);
						setTimeout(runInterval, 3000);
						return;
					}
					if (res && res.result && res.result.status === "OK" && res.result.hasOwnProperty('block_header')) {
						let hash = res.result.block_header.hash.toString('hex');
						if (!lastHash || lastHash !== hash) {
							lastHash = hash
							log('info', logSystem, '%s found new hash %s', [pool.coin, hash]);
							callback(null, true);
							return;
						} else if (config.daemon.alwaysPoll || false) {
							callback(null, true);
							return;
						} else {
							callback(true);
							return;
						}
					} else {
						log('error', logSystem, '%s bad reponse from daemon', [pool.coin]);
						setTimeout(runInterval, 3000);
						return;
					}
				});
			},
			function (getbc, callback) {
				apiInterfaces.jsonHttpRequest(pool.childDaemon.host, pool.childDaemon.port, templateData, function (err, res) {
					if (err) {
						log('error', logSystem, '%s Error polling getblocktemplate %j', [pool.coin, err])
						callback(null)
						return
					}
					process.send({
						type: 'ChildBlockTemplate',
						block: res.result,
						poolIndex: process.env.poolId
					})
					callback(null)
				})
			}
		],
		function (error) {
			if (error) {}
			setTimeout(function () {
				runInterval()
			}, config.poolServer.blockRefreshInterval)
		})
}

runInterval()