226 lines
8.0 KiB
JavaScript
226 lines
8.0 KiB
JavaScript
//environment variables
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require('dotenv').config();
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//libraries
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let CronJob = require('cron').CronJob;
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//utilities
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let { log } = require('../common/utilities.js');
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const attackRequest = (connection) => (req, res) => {
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//verify the attacker's credentials (only the attacker can launch an attack)
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let query = 'SELECT COUNT(*) AS total FROM sessions WHERE accountId = ? AND accountId IN (SELECT id FROM accounts WHERE username = ?) AND token = ?;';
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connection.query(query, [req.body.id, req.body.attacker, req.body.token], (err, results) => {
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if (err) throw err;
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if (results[0].total !== 1) {
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res.status(400).write(log('Invalid attack credentials', req.body.id, req.body.attacker, req.body.defender, req.body.token));
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res.end();
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return;
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}
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//verify that the defender's profile exists
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let query = 'SELECT accountId FROM profiles WHERE accountId IN (SELECT id FROM accounts WHERE username = ?);';
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connection.query(query, [req.body.defender], (err, results) => {
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if (err) throw err;
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if (results.length !== 1) {
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res.status(400).write(log('Invalid defender credentials', req.body.id, req.body.attacker, req.body.defender, req.body.token));
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res.end();
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return;
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}
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let defenderId = results[0].accountId;
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//verify that the attacker has enough soldiers
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let query = 'SELECT soldiers FROM profiles WHERE accountId = ?;';
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connection.query(query, [req.body.id], (err, results) => {
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if (err) throw err;
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if (results[0].soldiers <= 0) {
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res.status(400).write(log('Not enough soldiers', req.body.attacker, req.body.defender, results[0].soldiers));
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res.end();
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return;
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}
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let attackingUnits = results[0].soldiers;
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//verify that the attacker is not already attacking someone
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isAttacking(connection, req.body.attacker, (err, attacking) => {
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if (err) throw err;
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if (attacking) {
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res.status(400).write(log('You are already attacking someone', req.body.id, req.body.attacker, req.body.token));
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res.end();
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return;
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}
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//create the pending attack record
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let query = 'INSERT INTO pendingCombat (eventTime, attackerId, defenderId, attackingUnits) VALUES (DATE_ADD(CURRENT_TIMESTAMP(), INTERVAL 60 * ? SECOND), ?, ?, ?);';
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connection.query(query, [attackingUnits, req.body.id, defenderId, attackingUnits], (err) => {
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if (err) throw err;
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res.status(200).json({
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status: 'attacking',
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attacker: req.body.attacker,
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defender: req.body.defender,
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msg: log('Attacking', req.body.attacker, req.body.defender)
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});
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res.end();
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});
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});
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});
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});
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});
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};
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const attackStatusRequest = (connection) => (req, res) => { //TODO: proper credentials
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isAttacking(connection, req.body.attacker, (err, attacking, defender) => {
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if (err) throw err;
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res.status(200).json({
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status: attacking ? 'attacking' : 'idle',
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attacker: req.body.attacker,
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defender: defender,
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msg: null
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});
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res.end();
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});
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};
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const combatLogRequest = (connection) => (req, res) => {
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let query = 'SELECT pastCombat.*, atk.username AS attacker, def.username AS defender FROM pastCombat JOIN accounts AS atk ON pastCombat.attackerId = atk.id JOIN accounts AS def ON pastCombat.defenderId = def.id WHERE atk.username = ? OR def.username = ? ORDER BY eventTime DESC LIMIT ?, ?;';
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connection.query(query, [req.body.username, req.body.username, req.body.start, req.body.length], (err, results) => {
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if (err) throw err;
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res.status(200).json(results);
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log('Combat log sent', req.body.username, req.body.start, req.body.length);
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});
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};
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const runCombatTick = (connection) => {
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//once per second
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let combatTick = new CronJob('* * * * * *', () => {
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//find each pending combat
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let query = 'SELECT * FROM pendingCombat WHERE eventTime < CURRENT_TIMESTAMP();';
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connection.query(query, (err, results) => {
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if (err) throw err;
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results.forEach((pendingCombat) => {
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//check that the attacker still has enough soliders
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let query = 'SELECT soldiers FROM profiles WHERE accountId = ?;';
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connection.query(query, [pendingCombat.attackerId], (err, results) => {
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if (err) throw err;
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if (results[0].soldiers < pendingCombat.attackingUnits) {
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//delete the failed combat
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let query = 'DELETE FROM pendingCombat WHERE id = ?;';
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connection.query(query, [pendingCombat.id], (err) => {
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if (err) throw err;
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log('Not enough soldiers for attack', pendingCombat.attackerId, results[0].soldiers, pendingCombat.attackingUnits);
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});
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return;
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}
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//get the defender's undefended status
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isAttacking(connection, pendingCombat.defenderId, (err, undefended) => {
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if (err) throw err;
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//get the defending unit count, gold
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let query = 'SELECT soldiers, recruits, gold FROM profiles WHERE accountId = ?;';
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connection.query(query, [pendingCombat.defenderId], (err, results) => {
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if (err) throw err;
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let defendingUnits;
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if (!undefended && results[0].soldiers > 0) {
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defendingUnits = results[0].soldiers;
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} else {
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defendingUnits = results[0].recruits;
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}
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//determine the victor
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//TODO: add equipment effectiveness
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let rand = Math.random() * (pendingCombat.attackingUnits + defendingUnits * (undefended ? 0.25 : 1));
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let victor = rand <= pendingCombat.attackingUnits ? 'attacker' : 'defender';
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//determine the spoils and casualties
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let spoilsGold = Math.floor(results[0].gold * (victor === 'attacker' ? 0.1 : 0.02));
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let casualtiesVictor = Math.floor((pendingCombat.attackingUnits >= 10 ? pendingCombat.attackingUnits - 10 : 0) * (victor === 'attacker' ? 0.05 : 0.1));
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//save the combat
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let query = 'INSERT INTO pastCombat (eventTime, attackerId, defenderId, attackingUnits, defendingUnits, undefended, victor, spoilsGold, casualtiesVictor) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?);';
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connection.query(query, [pendingCombat.eventTime, pendingCombat.attackerId, pendingCombat.defenderId, pendingCombat.attackingUnits, defendingUnits, undefended, victor, spoilsGold, casualtiesVictor], (err) => {
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if (err) throw err;
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//update the attacker profile
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let query = 'UPDATE profiles SET gold = gold + ?, soldiers = soldiers - ? WHERE accountId = ?;';
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connection.query(query, [spoilsGold, casualtiesVictor, pendingCombat.attackerId], (err) => {
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if (err) throw err;
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//update the defender profile
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let query = 'UPDATE profiles SET gold = gold - ? WHERE accountId = ?;';
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connection.query(query, [spoilsGold, pendingCombat.defenderId], (err) => {
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if (err) throw err;
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//delete the pending combat
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let query = 'DELETE FROM pendingCombat WHERE id = ?;';
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connection.query(query, [pendingCombat.id], (err) => {
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if (err) throw err;
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log('Combat executed', pendingCombat.attackerId, pendingCombat.defenderId, victor, spoilsGold);
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});
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});
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});
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});
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});
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});
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});
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});
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});
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});
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combatTick.start();
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};
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const isNormalInteger = (str) => {
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let n = Math.floor(Number(str));
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return n !== Infinity && String(n) == str && n >= 0;
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};
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const isAttacking = (connection, user, cb) => {
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let query;
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if (isNormalInteger(user)) {
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query = 'SELECT * FROM pendingCombat WHERE attackerId = ?;';
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} else if (typeof(user) === 'string') {
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query = 'SELECT * FROM pendingCombat WHERE attackerId IN (SELECT id FROM accounts WHERE username = ?);';
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} else {
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return cb(`Unknown argument type for user: ${typeof(user)}`);
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}
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connection.query(query, [user], (err, results) => {
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if (err) throw err;
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if (results.length === 0) {
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return cb(undefined, false);
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} else {
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//get the username of the person being attacked
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let query = 'SELECT username FROM accounts WHERE id = ?;';
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connection.query(query, [results[0].defenderId], (err, results) => {
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if (err) throw err;
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return cb(undefined, true, results[0].username);
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});
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}
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});
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};
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module.exports = {
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attackRequest: attackRequest,
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attackStatusRequest: attackStatusRequest,
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combatLogRequest: combatLogRequest,
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runCombatTick: runCombatTick,
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isAttacking: isAttacking
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};
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