const winston = require('winston'),
    fs = require('fs'),
    yaml = require('js-yaml'),
    coind = require('node-gameunits');

const Twitter = require('twitter');
// check if the config file exists
if (!fs.existsSync('./config/config.yml')) {
    winston.error("Configuration file doesn't exist! Please read the README.md file first.");
    process.exit(1);
}
// load settings
const settings = yaml.load(fs.readFileSync('./config/config.yml', 'utf-8'));
// load winston's cli defaults
winston.cli();
// write logs to file
if (settings.log.file) {
    winston.add(winston.transports.File, {
        filename: settings.log.file,
        level: 'debug'
    });
}
// connect to coin json-rpc
winston.info('Connecting to coind...');
let coin = coind({
    host: settings.rpc.host,
    port: settings.rpc.port,
    user: settings.rpc.user,
    pass: settings.rpc.pass
});
// checking if we are connected.

coin.getBalance(function (err, balance) {
    if (err) {
        winston.error('Could not connect to %s RPC API! ', settings.coin.full_name, err);
        process.exit(1);
        return;
    }
    var balance = typeof balance == 'object' ? balance.result : balance;
    winston.info('Connected to JSON RPC API. Current total balance is %d' + settings.coin.short_name, balance);
});

// connect to twitter
winston.info('Connecting to Twitter');
var client = new Twitter({
    consumer_key: settings.twitter.consumer_key,
    consumer_secret: settings.twitter.consumer_secret,
    access_token_key: settings.twitter.access_token_key,
    access_token_secret: settings.twitter.access_token_secret
});
//
client.get('followers/ids', function (error, tweets, response) {
    if (error) {
        console.log(error);
    }
    winston.info('Connected to Twitter. Followers:' + tweets.ids.length);
});

// basic handlers
var locks = [];

function makeid() {
    var text = '';
    var possible = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
    for (var i = 0; i < 5; i++) text += possible.charAt(Math.floor(Math.random() * possible.length));
    return text;
}

function replytweet(to, replyid, themessage) {
    winston.info('Preparing tweet' + '@' + to + ' :' + themessage);
    var newtweet = '@' + to + ' ' + themessage + '  \nMsg_ID:(' + makeid() + ')';
    winston.info('' + '@' + to + ' :' + newtweet);
    client.post('statuses/update', {
        status: newtweet,
        in_reply_to_status_id: replyid
    }, function (error, params, response) {
        if (error) {
            console.log(error);
            //throw error;
        }

        console.log('Tweeting');
    });
}

function getAddress(nickname, callback) {
    winston.debug('Requesting address for %s', nickname);
    coin.send('getaccountaddress', settings.rpc.prefix + nickname.toLowerCase(), function (err, address) {
        if (err) {
            winston.error('Something went wrong while getting address. ' + err);
            callback(err);
            return false;
        }
        callback(false, address);
    });
}

String.prototype.expand = function (values) {
    var global = {
        nick: settings.twitter.twittername
    };
    return this.replace(/%([a-zA-Z_]+)%/g, function (str, variable) {
        return typeof values[variable] == 'undefined' ? (typeof settings.coin[variable] == 'undefined' ? (typeof global[variable] == 'undefined' ? str : global[variable]) : settings.coin[variable]) : values[variable];
    });
};
client.stream('statuses/filter', {track: settings.twitter.twitterkeyword}, function (stream) {
    stream.on('error', function (error) {
        winston.error('Something went wrong with the twitter streaming api.');
        winston.error(error);
    });
    stream.on('end', function (reason) {
        winston.error('Twitter streaming api failed with');
        winston.error(reason);
    });
    stream.on('data', function (tweet) {
        console.log('@' + tweet.user.screen_name + '|' + tweet.text);
        if (tweet.text.substring(0, 2) === 'RT') {
            console.log('Retweet Ingrored');
            return;
        }
        var regex = new RegExp('(' + settings.twitter.twitterkeyword + ')(\\s)([a-zA-Z]+)', 'i');
        var match = tweet.text.match(regex);
        if (match == null) return;
        var command = match[3];
        var from = tweet.user.screen_name;
        var msg = tweet.txt;
        var message = tweet.text;
        var replyid = tweet.id_str;

        if (command == 'help' || command == 'terms') {
            for (var i = 0; i < settings.messages[command].length; i++) {
                replytweet(from, replyid, settings.messages[command][i].expand({}));
            }
            return;
        }

        switch (command) {
            case 'tip':
                var regex = new RegExp('(' + settings.twitter.twitterkeyword + ')(\\s)([a-zA-Z]+)(\\s)(\\@)(.+)(\\s)(.+)', 'i'); //Uglyfix
                var match = tweet.text.match(regex);
                console.log('tip');
                console.log(match[0] + ',' + match[1] + ',' + match[2] + ',' + match[3] + ',' + match[4] + ',' + match[5] + ',' + match[6] + ',' + match[7] + ',' + match[8]);
                if (match == null || match.length < 3) {
                    replytweet(from, replyid, 'Usage: nameofbot tip <twitterhandle> <amount>');
                    return;
                }
                var to = match[6];
                var amount = Number(match[8]);
                console.log('To:' + amount);
                // lock
                if (locks.hasOwnProperty(from.toLowerCase()) && locks[from.toLowerCase()]) return;
                locks[from.toLowerCase()] = true;

                if (isNaN(amount)) {
                    locks[from.toLowerCase()] = null;
                    replytweet(from, replyid, settings.messages.invalid_amount.expand({name: from, amount: match[8]}));
                    return;
                }

                if (to.toLowerCase() == from.toLowerCase()) {
                    locks[from.toLowerCase()] = null;
                    replytweet(from, replyid, settings.messages.tip_self.expand({name: from}));
                    return;
                }
                if (amount < settings.coin.min_tip) {
                    locks[from.toLowerCase()] = null;
                    replytweet(from, replyid, settings.messages.tip_too_small.expand({
                        from: from,
                        to: to,
                        amount: amount
                    }));
                    return;
                }
                // check balance with min. 5 confirmations
                coin.getBalance(settings.rpc.prefix + from.toLowerCase(), settings.coin.min_confirmations, function (err, balance) {
                    if (err) {
                        locks[from.toLowerCase()] = null;
                        winston.error('Error in tip command.', err);

                        replytweet(from, replyid, settings.messages.error.expand({name: from}));
                        return;
                    }
                    var balance = typeof balance == 'object' ? balance.result : balance;
                    if (balance >= amount) {
                        coin.send('move', settings.rpc.prefix + from.toLowerCase(), settings.rpc.prefix + to.toLowerCase(), amount, function (err, reply) {
                            locks[from.toLowerCase()] = null;
                            if (err || !reply) {
                                winston.error('Error in tip command', err);
                                replytweet(from, replyid, settings.messages.error.expand({name: from}));
                                return;
                            }
                            winston.info('%s tipped %s %d%s', from, to, amount, settings.coin.short_name);
                            replytweet(from, replyid, settings.messages.tipped.expand({
                                from: from,
                                to: to,
                                amount: amount
                            }));
                        });
                    } else {
                        locks[from.toLowerCase()] = null;
                        winston.info('%s tried to tip %s %d, but has only %d', from, to, amount, balance);
                        replytweet(from, replyid, settings.messages.no_funds.expand({
                            name: from,
                            balance: balance,
                            short: amount - balance,
                            amount: amount
                        }));
                    }
                });
                break;
            case 'deposit':
            case 'address':
                console.log('adress');
                var user = from.toLowerCase();
                getAddress(user, function (err, address) {
                    if (err) {
                        winston.error('Error in address command', err);
                        replytweet(from, replyid, settings.messages.error.expand({name: from}));
                        return;
                    }
                    replytweet(from, replyid, settings.messages.deposit_address.expand({name: user, address: address}));
                });
                break;
            case 'balance':
                console.log('balance');
                var user = from.toLowerCase();
                coin.getBalance(settings.rpc.prefix + user, settings.coin.min_confirmations, function (err, balance) {
                    if (err) {
                        winston.error('Error in balance command', err);
                        replytweet(from, replyid, settings.messages.error.expand({name: from}));
                        return;
                    }
                    var balance = typeof balance == 'object' ? balance.result : balance;
                    coin.getBalance(settings.rpc.prefix + user, 0, function (err, unconfirmed_balance) {
                        if (err) {
                            winston.error('Error in balance command', err);
                            replytweet(from, replyid, settings.messages.balance.expand({balance: balance, name: user}));
                            return;
                        }
                        var unconfirmed_balance = typeof unconfirmed_balance == 'object' ? unconfirmed_balance.result : unconfirmed_balance;
                        replytweet(from, replyid, settings.messages.balance_unconfirmed.expand({
                            balance: balance,
                            name: user,
                            unconfirmed: unconfirmed_balance - balance
                        }));
                    });
                });
                break;
            case 'withdraw':
                console.log('withdrawl');
                var user = from.toLowerCase();
                var match = message.match(/.?withdraw (\S+)$/);
                if (match == null) {
                    replytweet(from, replyid, 'Usage: withdraw <' + settings.coin.full_name + ' address>');
                    return;
                }
                var address = match[1];
                coin.validateAddress(address, function (err, reply) {
                    if (err) {
                        winston.error('Error in withdraw command', err);
                        replytweet(from, replyid, settings.messages.error.expand({name: from}));
                        return;
                    }
                    if (reply.isvalid) {
                        coin.getBalance(settings.rpc.prefix + from.toLowerCase(), settings.coin.min_confirmations, function (err, balance) {
                            if (err) {
                                winston.error('Error in withdraw command', err);
                                replytweet(from, replyid, settings.messages.error.expand({name: from}));
                                return;
                            }
                            var balance = typeof balance == 'object' ? balance.result : balance;
                            if (balance < settings.coin.min_withdraw) {
                                winston.warn('%s tried to withdraw %d, but min is set to %d', from, balance, settings.coin.min_withdraw);
                                replytweet(from, replyid, settings.messages.withdraw_too_small.expand({
                                    name: from,
                                    balance: balance
                                }));
                                return;
                            }
                            coin.sendFrom(settings.rpc.prefix + from.toLowerCase(), address, balance - settings.coin.withdrawal_fee, function (err, reply) {
                                if (err) {
                                    winston.error('Error in withdraw command', err);
                                    replytweet(from, replyid, settings.messages.error.expand({name: from}));
                                    return;
                                }
                                var values = {
                                    name: from,
                                    address: address,
                                    balance: balance,
                                    amount: balance - settings.coin.withdrawal_fee,
                                    transaction: reply
                                };
                                for (var i = 0; i < settings.messages.withdraw_success.length; i++) {
                                    var msg = settings.messages.withdraw_success[i];
                                    replytweet(from, replyid, msg.expand(values));
                                }
                                // transfer the rest (withdrawal fee - txfee) to bots wallet
                                coin.getBalance(settings.rpc.prefix + from.toLowerCase(), function (err, balance) {
                                    if (err) {
                                        winston.error('Something went wrong while transferring fees', err);
                                        return;
                                    }
                                    var balance = typeof balance == 'object' ? balance.result : balance;
                                    // moves the rest to bot's wallet
                                    coin.move(settings.rpc.prefix + from.toLowerCase(), settings.rpc.prefix + settings.twitter.twittername.toLowerCase(), balance);
                                });
                            });
                        });
                    } else {
                        winston.warn('%s tried to withdraw to an invalid address', from);
                        replytweet(from, replyid, settings.messages.invalid_address.expand({
                            address: address,
                            name: from
                        }));
                    }
                });
                break;
            default:
                winston.warn('Invalid Command' + command);
                replytweet(from, replyid, 'Invalid command. Tweet "@LBC_TipBot lbryian help" for list of commands or see reply below');

                break;
        }
    });
});