const express = require('express');
const app = express();
const bodyparser = require('body-parser');
const cors = require('cors');
const crypto = require('crypto');
const postmodel = require('./models/post');
const usermodel = require('./models/user');
const ownermodel = require('./models/owner');
const itemmodel = require('./models/item');
const ordermodel = require('./models/order');
const pricemodel = require('./models/price');
const txmodel = require('./models/tx');
const paymentmodel = require('./models/payment');
const zecTxModel = require('./models/zectxs.js');
const countryModel = require('./models/country.js');
const mongoose = require('mongoose');
const stdrpc = require('stdrpc');
const CoinGecko = require('coingecko-api');
var URLSafeBase64 = require('urlsafe-base64');
var Buffer = require('buffer/').Buffer;

var db = require('./config/db');
mongoose.connect('mongodb://'+db.user+':'+db.password+'@'+db.server+'/'+db.database).then(() => {
	console.log("connecting-- ", db.database);
}).catch(() => {
	console.log("connection failed!");
});

var fullnode = require('./config/fullnode');
const rpc = stdrpc({
	url: fullnode.url,
	username: fullnode.username,
	password: fullnode.password
});

var async = require('async');

const CoinGeckoClient = new CoinGecko();

var intervalObject = setInterval( function() {
	CoinGeckoClient.simple.price({
		ids: ['zcash'],
		vs_currencies: ['usd', 'gbp', 'eur', 'cad', 'aud']
	}).then((data) => {
		pricemodel.findOneAndUpdate({currency: 'usd'}, { price: data.data.zcash.usd, timestamp: Date.now()}, {new:true, upsert:true}, function(err,docs) {
			if(err) {
				console.log(err);
			}
		});
		pricemodel.findOneAndUpdate({currency: 'gbp'}, { price: data.data.zcash.gbp, timestamp: Date.now()}, {new:true, upsert:true}, function(err,docs) {
			if(err) {
				console.log(err);
			}
		});
		pricemodel.findOneAndUpdate({currency: 'eur'}, { price: data.data.zcash.eur, timestamp: Date.now()}, {new:true, upsert:true}, function(err,docs) {
			if(err) {
				console.log(err);
			}
		});
		pricemodel.findOneAndUpdate({currency: 'cad'}, { price: data.data.zcash.cad, timestamp: Date.now()}, {new:true, upsert:true}, function(err,docs) {
			if(err) {
				console.log(err);
			}
		});
		pricemodel.findOneAndUpdate({currency: 'aud'}, { price: data.data.zcash.aud, timestamp: Date.now()}, {new:true, upsert:true}, function(err,docs) {
			if(err) {
				console.log(err);
			}
		});
	}).catch((err) => {
		console.log(err);
	});
}, 90000);

function hexToString(hexString) {
	var str = '';
	for (var n=0; n < hexString.length; n +=2) {
		str += String.fromCharCode(parseInt(hexString.substr(n, 2), 16));
	}
	return str;
}

function sendPin(pin, address) {
	//var memo = URLSafeBase64.encode(Buffer.from('ZGO pin: '.concat(pin)));
	var memo = Buffer.from('ZGo PIN: '.concat(pin)).toString('hex');
	//console.log(typeof(memo));
	var amounts = [
		{
			address: address,
			amount: 0.00000001,
			memo: memo
		}
	];
	rpc.z_sendmany(fullnode.addr, amounts).catch((err) => {
		console.log('Sendmany', err);
	});
}

var blockInterval = setInterval( function() {
	console.log('Node periodic Zcash scan');
	rpc.z_listreceivedbyaddress(fullnode.addr, 1).then(txs => {
		var re = /.*ZGO::(.*)\sReply-To:\s(z\w+)/;
		var pay = /.*ZGOp::(.*)/;
		async.each (txs, function(txData, callback) {
			var memo = hexToString(txData.memo).replace(/\0/g, '');
			if (!txData.change) {
				zecTxModel.updateOne({txid: txData.txid}, { txid: txData.txid, confirmations: txData.confirmations, amount:txData.amount, memo: memo}, {new:true, upsert:true}, function(err,docs) {
					if (err) {
						console.log(err);
					}
				});
			}
			if (re.test(memo) && txData.confirmations < 100) {
				//console.log('Processing tx:', memo);
				var match = re.exec(memo);
				if (match != null) {
					var address = match[2];
					var session = match[1];
					var blocktime = txData.blocktime;
					var amount = txData.amount;
					var expiration = blocktime;
					//console.log('  ', session, blocktime);
					txmodel.updateOne({txid: txData.txid}, { txid: txData.txid, address: address, session: session, confirmations: txData.confirmations, amount:txData.amount, memo: memo}, {new:true, upsert:true}, function(err,docs) {
						if (err) {
							console.log(err);
						}
					});
					if (txData.confirmations >= 2 ) {
						usermodel.findOne({address: address, session: session, blocktime: blocktime}).then(function(doc){
							if (doc == null){
								console.log('User not found', session, blocktime);
								const n = crypto.randomInt(0, 10000000);
								const pin = n.toString().padStart(6, '0');
								sendPin(pin, address);
								var user = new usermodel({
									address: address,
									session: session,
									blocktime: blocktime,
									pin: pin,
									validated: false
								});
								user.save(function(error) {
									if (error) {
										console.log(error);
									}

									console.log('User saved');
								});
							}
						});
					} 
				}
			}
			var exptime = 0;
			if (pay.test(memo) && txData.confirmations < 100) {
				var match2 = pay.exec(memo);
				if (match2 != null) {
					var session = match2[1];
				}
				if (txData.amount >= 0.001 && txData.amount < 0.005){
					exptime = txData.blocktime + 3600;
				} else if (txData.amount >= 0.005 && txData.amount < 0.025){
					exptime = txData.blocktime + 24*3600;
				} else if (txData.amount >= 0.025 && txData.amount < 0.1) {
					exptime = txData.blocktime + 7*24*3600;
				} else if (txData.amount >= 0.1) {
					exptime = txData.blocktime + 4*7*24*3600;
				}

				usermodel.findOne({session: session}).then(function(doc){
					if(doc != null) {
						paymentmodel.findOne({address: doc.address, blocktime: txData.blocktime, amount: txData.amount}).then(function(payments){
							if(payments == null){
								var payment = new paymentmodel({
									address: doc.address,
									blocktime: txData.blocktime,
									expiration: new Date(exptime * 1000),
									amount: txData.amount,
									session: doc.session
								});

								payment.save(function(error) {
									if (error) {
										console.log(error);
									} else {
										console.log('Payment saved');
									}
								});
							}
						});
					}
				});
			}
		}, function (err) {
			if (err) {
				console.log(err);
			}
			console.log('Txs synced');
		});

	});
}, 75000);

var payCheck = setInterval( function() {

	ownermodel.find({}).then((documents) => {
		if(documents.length > 0){
			//console.log(documents);
			async.each (documents, function(document, callback) {
				paymentmodel.findOne({ address: document.address, expiration: {$gt: Date.now()}}).then(payment => {
					if (payment != null){
						document.paid = true;
						document.save();
					} else {
						document.paid = false;
						document.save();
					}
				});
			}, function (err) {
				if (err) {
					console.log(err);
				} else {
					console.log("Owners checked for payment");
				}
			});
		}
	});
}, 60000);

app.use(cors());
app.options('*', cors());

app.use(bodyparser.json());

app.use((req, res, next) => {
	res.setHeader("Access-Control-Allow-Origin", "*");
	res.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
	res.setHeader("Access-Control-Allow-Methods", "GET, POST, PATCH, DELETE, OPTIONS");
	next();
});

app.use((req, res, next) => {
	if (req.headers.authorization !== 'Le2adeic8Thah4Aeng4daem6i' ) {
		return res.status(401).send('Authorization required.');
	} else {
		next();
	}
});


app.get('/api/countries', (req, res, next) => {
	console.log('Get: /api/countries');
	countryModel.find({}).then((documents) => {
		if (documents != null) {
			res.status(200).json({
				message: 'Country data found',
				countries: documents
			});
		} else {
			res.status(204).json({
				message: 'No country data available'
			});
		}
	});
});

app.get('/api/users', (req, res, next) => {
	console.log('Get: /api/users');
	usermodel.find({'address': req.query.address, 'session': req.query.session, 'expired': { $ne: true}}).
		then((documents) => {
			if (documents != null) {
				res.status(200).json({
					message: 'Users found successfully',
					users: documents
				});
			} else {
				res.status(204).json({
					message: 'User not found',
					users: null
				});
			}
		});
});

app.get('/api/pending', (req, res, next) => {
	console.log('Get: /api/pending', req.query.session);
	txmodel.find({'session': req.query.session, 'confirmations': {$lt: 10}}).
		then((documents) => {
			if (documents.length > 0) {
				//console.log('pending', documents);
				res.status(200).json({
					message: 'Found pending txs',
					txs: documents
				});
			} else {
				//console.log('pending not found', documents);
				res.status(204).json({
					message: 'No txs found',
					txs: null
				});
			}
		});
});

app.get('/api/getuser', (req, res, next) => {
	console.log('Get: /api/getuser/', req.query.session);
	usermodel.find({'session': req.query.session, 'expired': { $ne: true }}).
		then((documents) => {
			if(documents.length > 0){
				//console.log(documents);
				console.log('   found user');
				res.status(200).json({
					message: 'User found!',
					user: documents
				});
			} else {
				console.log('   did not find user');
				res.status(204).json({
					message: 'User not found!',
					user: null
				});
			}
		});
});

app.get('/api/blockheight', (req, res, next) => {
	console.log('Get: /api/blockheight');
	rpc.getblock("-1", 1).then(block => {
		res.status(200).json({
			message: 'Found block',
			height: block.height
		});
	});
});

app.get('/api/txs', (req, res, next) => {
	console.log('Get: /api/txs');
	rpc.z_listreceivedbyaddress(fullnode.addr, 10).then(txs => {
		res.status(200).json({
			message: 'Transactions found',
			txs: txs
		});
	});
});

app.get('/api/getaddr', (req, res, next) => {
	console.log('Get: /api/getaddr');
	res.status(200).json({
		message: 'Sending address',
		addr: fullnode.addr
	});
});

app.get('/api/getowner', (req, res, next) => {
	console.log('Get: /api/getowner');
	ownermodel.find({'address': req.query.address}).then((documents) => {
		if(documents.length > 0){
			//console.log(documents);
			res.status(200).json({
				message: 'Owner found!',
				owner: documents
			});
		} else {
			res.status(204).json({
				message: 'Owner not found!',
				owner: null
			});
		}
	});

});

app.post('/api/addowner', (req, res, next) => {
	console.log('Post: /api/addowner');
	const owner = new ownermodel(req.body.owner);
	owner.save();
	res.status(201).json({
		message: 'Owner added successfully'
	});
});

app.post('/api/validateuser', (req, res, next) => {
	console.log('Post: /api/validateuser');
	usermodel.findByIdAndUpdate(req.body.user._id, req.body.user,
		function(err, docs) {
			if (err) {
				console.log(err);
			} else {
				res.status(201).json({
					message: 'User Validated',
					user: docs
				});
			}
		});
});

app.post('/api/updateowner', (req, res, next) => {
	console.log('Post: /api/updateowner');
	ownermodel.findByIdAndUpdate(req.body.owner._id, req.body.owner,
			function(err, docs) {
				if (err) {
					console.log(err);
				} else {
					console.log(docs);
					res.status(201).json({
						message: 'Owner updated',
						owner: docs
					});
				}
			});
});

app.get('/api/getitems', (req, res, next) => {
	console.log('Get: /api/getitems');
	//console.log('getitems', req.query.address);
	if (req.query.address.length > 0 ) {
		const items = itemmodel.find({user: req.query.address}).then((documents) => {
			if(documents.length > 0){
				//console.log(documents);
				res.status(200).json({
					message: 'items found!',
					items: documents
				});
			} else {
				res.status(204).json({
					message: 'items not found!',
					items: []
				});
			}
		});
	} else {
		res.status(204).json({
			message: 'no address',
			items: []
		});
	}
});

app.post('/api/item', (req, res, next) => {
	console.log('Post: /api/item', req.body.item);
	if ( req.body.item._id == null ) {
		const item = new itemmodel(req.body.item);
		item.save();
		res.status(201).json({
			message: 'Item added'
		});
	} else {
		console.log('Editing', req.body.item._id);
		itemmodel.findByIdAndUpdate(req.body.item._id, {'name': req.body.item.name, 'description': req.body.item.description, 'cost': req.body.item.cost},
			function(err, docs) {
				if (err) {
					console.log(err);
				} else {
					res.status(201).json({
						message: 'Item updated'
					});
				}
			});
	}
});

app.delete('/api/item/:id', (req, res, next) => {
	console.log('delete endpoint', req.params.id);
	itemmodel.findByIdAndDelete(req.params.id, function (err, docs) {
		if (err) {
			console.log(err);
		} else {
			res.status(200).json({
				message: 'Item deleted'
			});
		}
	});
});

app.delete('/api/user/:id', (req, res, next) => {
	console.log("Delete user", req.params.id);
	usermodel.findByIdAndUpdate(req.params.id, {expired: true}, function(err, docs) {
		if (err) {
			console.log(err);
		} else {
			res.status(200).json({
				message: 'User session deleted'
			});
		}
	});
});

app.get('/api/price', (req, res, next) => {
	console.log('Get /api/price');
	const price = pricemodel.findOne({currency: req.query.currency}).then((document) => {
		if (document != null) {
			res.status(200).json({
				message: 'price found!',
				price: document
			});
		} else {
			res.status(204).json({
				message: 'no price found!',
				order: null
			});
		}
	});
});

app.get('/api/allorders', (req, res, next) => {
	console.log('Get /api/allorders');
	if (req.query.address.length > 0) {
		const orders = ordermodel.find({address: req.query.address, closed: true}).then((documents) => {
			if (documents != null) {
				res.status(200).json({
					message: 'orders found!',
					orders: documents
				});
			} else {
				res.status(204).json({
					message: 'no orders found',
					orders: null
				});
			}
		});
	}
});

app.get('/api/receipt', (req, res, next) => {
	console.log('Get /api/receipt');
	if (req.query.id.length > 0) {
		const order = ordermodel.findOne({_id: req.query.id}).then((documents) => {
			if (documents != null) {
				console.log(documents);
				res.status(200).json({
					message: 'order found!',
					order: documents
				});
			} else {
				res.status(204).json({
					message: 'no order found!',
					order: null
				});
			}
		});
	} else {
		res.status(204).json({
			message: 'no valid ID received',
			order: null
		});
	}
});

app.get('/api/order', (req, res, next) => {
	console.log('Get /api/order');
	if (req.query.session.length > 0) {
		const order = ordermodel.findOne({session: req.query.session, closed: false}).then((documents) => {
			if (documents != null) {
				console.log(documents);
				res.status(200).json({
					message: 'order found!',
					order: documents
				});
			} else {
				res.status(204).json({
					message: 'no order found!',
					order: null
				});
			}
		});
	} else {
		res.status(204).json({
			message: 'no session received',
			order: null
		});
	}
});

app.post('/api/order', (req, res, next) => {
	console.log('Post /api/order', req.body);
	if(req.body.order._id == null) {
		const order = new ordermodel(req.body.order);
		order.save();
		res.status(200).json({
			message: 'Order added',
			order: order
		});
	} else {
		ordermodel.findByIdAndUpdate(req.body.order._id, {
			address: req.body.order.address,
			session: req.body.order.session,
			price: req.body.order.price,
			total: req.body.order.total,
			currency: req.body.order.currency,
			totalZec: req.body.order.totalZec,
			closed: req.body.order.closed
		}, function(err, docs) {
			if(err) {
				console.log(err);
			} else {
				res.status(200).json({
					message: 'Order updated'
				});
			}
		});
	}
});

app.post('/api/lineitem', (req, res, next) => {
	console.log('Post /api/lineitem');
	ordermodel.findByIdAndUpdate(req.body.order_id, { $push: {lines: req.body.line}}, function(err,docs) {
		if (err) {
			console.log(err);
		} else {
			res.status(200).json({
				message: 'Item added to order'
			});
		}
	});
});

app.delete('/api/order/:id', (req, res, next) => {
	console.log('delete order endpoint', req.params.id);
	ordermodel.findByIdAndDelete(req.params.id, function (err, docs) {
		if (err) {
			console.log(err);
		} else {
			console.log(docs);
			res.status(200).json({
				message: 'Order deleted'
			});
		}
	});
});

module.exports = app;