//environment variables
require('dotenv').config();

//libraries
let formidable = require('formidable');
let CronJob = require('cron').CronJob;

let { isAttacking } = require('./combat.js');

//utilities
let { log } = require('../common/utilities.js');

//profile creation & requesting
const profileCreateRequest = (connection) => (req, res) => {
	//formidable handles forms
	let form = formidable.IncomingForm();

	//parse form TODO: form? That was a bad idea
	form.parse(req, (err, fields) => {
		if (err) throw err;

		//separate this section so it can be used elsewhere too
		return profileCreateRequestInner(connection, req, res, fields);
	});
}

function profileCreateRequestInner(connection, req, res, fields) {
	let query = 'SELECT accountId FROM profiles WHERE accountId IN (SELECT accounts.id FROM accounts WHERE username = ?);';
	connection.query(query, [fields.username], (err, results) => {
		if (err) throw err;

		if (results.length === 1) {
			res.status(400).write(log('That profile already exists', fields.username));
			res.end();
			return;
		}

		//check ID, username and token match
		let query = 'SELECT accountId FROM sessions WHERE accountId IN (SELECT id FROM accounts WHERE username = ?) AND token = ?;';
		connection.query(query, [fields.username, fields.token], (err, results) => {
			if (err) throw err;

			if (results.length !== 1 || results[0].accountId != fields.id) {
				res.status(400).write(log('Invalid profile creation credentials', fields.username, fields.id, fields.token));
				res.end();
				return;
			}

			let query = 'INSERT INTO profiles (accountId) SELECT accounts.id FROM accounts WHERE username = ?;';
			connection.query(query, [fields.username], (err) => {
				if (err) throw err;

				log('Profile created', fields.username, fields.id, fields.token);

				return profileRequestInner(connection, req, res, fields);
			});
		});
	});
}

const profileRequest = (connection) => (req, res) => {
	//formidable handles forms
	let form = formidable.IncomingForm();

	//parse form
	form.parse(req, (err, fields) => {
		if (err) throw err;

		//separate this section so it can be used elsewhere too
		return profileRequestInner(connection, req, res, fields);
	});
};

function profileRequestInner(connection, req, res, fields) {
	let query = 'SELECT * FROM profiles WHERE accountId IN (SELECT accounts.id FROM accounts WHERE username = ?);';
	connection.query(query, [fields.username], (err, results) => {
		if (err) throw err;

		if (results.length !== 1) {
			//pass it off to the profile creation process, IF the user is requesting their own profile
			let query = 'SELECT id FROM accounts WHERE id = ? AND id IN (SELECT accountId FROM sessions WHERE token = ?);';
			connection.query(query, [fields.id, fields.token], (err, results) => {
				if (err) throw err;

				if (results.length === 1) {
					return profileCreateRequestInner(connection, req, res, fields);
				} else {
					res.status(400).write(log('Profile not found', fields.username, fields.id, fields.token));
					res.end();
				}
			});
		} else {
			//results.length === 1
			res.status(200).json({
				username: fields.username,
				gold: results[0].gold,
				recruits: results[0].recruits,
				soldiers: results[0].soldiers,
				spies: results[0].spies,
				scientists: results[0].scientists
			});
			res.end();
			log('Profile sent', fields.username, fields.id, fields.token);
		}
	});
}

//actual actions to be taken
const recruitRequest = (connection) => (req, res) => {
	//formidable handles forms
	let form = formidable.IncomingForm();

	//parse form
	form.parse(req, (err, fields) => {
		if (err) throw err;

		//verify the credentials
		let query = 'SELECT accountId FROM sessions WHERE accountId = ? AND token = ?;';
		connection.query(query, [fields.id, fields.token], (err, results) => {
			if (err) throw err;

			if (results.length !== 1) {
				res.status(400).write(log('Invalid recruit credentials', fields.username, fields.id, fields.token));
				res.end();
				return;
			}

			//verify enough time has passed since the last successful recruit action
			let query = 'SELECT TIMESTAMPDIFF(HOUR, (SELECT lastRecruitTime FROM profiles WHERE accountId = ?), CURRENT_TIMESTAMP());';
			connection.query(query, [fields.id], (err, results) => {
				if (err) throw err;

				if (results.length !== 1) {
					res.status(400).write(log('Invalid database state', fields.username, fields.id, fields.token));
					res.end();
					return;
				}

				let timespans = results[0][Object.keys(results[0])];

				//not enough time has passed
				if (timespans < 22) {
					res.status(400).write(log('Not enough time has passed', fields.username, fields.id, fields.token));
					res.end();
					return;
				}

				//update the profile with the new data (gaining 1 recruit)
				let query = 'UPDATE profiles SET recruits = recruits + 1, lastRecruitTime = CURRENT_TIMESTAMP() WHERE accountId	= ?;';
				connection.query(query, [fields.id], (err) => {
					if (err) throw err;

					//send the new profile data as JSON (NOTE: possible duplication)
					let query = 'SELECT * FROM profiles WHERE accountId = ?;';
					connection.query(query, [fields.id], (err, results) => {
						if (err) throw err;

						//check just in case
						if (results.length !== 1) {
							res.status(400).write(log('Invalid recruit credentials', fields.username, fields.id, fields.token));
							res.end();
							return;
						}

						//results.length === 1
						res.status(200).json({
							username: fields.username, //TODO: join here
							gold: results[0].gold,
							recruits: results[0].recruits,
							soldiers: results[0].soldiers,
							spies: results[0].spies,
							scientists: results[0].scientists
						});
						res.end();
						log('Recruit successful', fields.username, fields.id, fields.token);
					});
				});
			});
		});
	});
}

const trainRequest = (connection) => (req, res) => {
	//formidable handles forms
	let form = formidable.IncomingForm();

	//parse form
	form.parse(req, (err, fields) => {
		if (err) throw err;

		//verify the credentials (NOTE: duplication)
		let query = 'SELECT accountId FROM sessions WHERE accountId = ? AND token = ?;';
		connection.query(query, [fields.id, fields.token], (err, results) => {
			if (err) throw err;

			if (results.length !== 1) {
				res.status(400).write(log('Invalid train credentials', fields.username, fields.id, fields.token));
				res.end();
				return;
			}

			//verify the role argument
			if (fields.role !== 'soldier' && fields.role !== 'spy' && fields.role !== 'scientist') {
				res.status(400).write(log('Invalid train parameters', fields.username, fields.role, fields.id, fields.token));
				res.end();
				return;
			}

			//can't train while attacking
			isAttacking(connection, fields.id, (err, attacking) => {
				if (err) throw err;

				if (attacking) {
					res.status(400).write(log('Can\'t train while attacking', fields.id));
					res.end();
					return;
				}

				//determine the cost of the training TODO: make these global for the client too
				let cost = 0;
				switch(fields.role) {
					case 'soldier':
						cost = 100;
						break;

					case 'spy':
						cost = 200;
						break;

					case 'scientist':
						cost = 120;
						break;
				}

				//verify that the user has a high enough gold and recruit balance
				let query = 'SELECT recruits, gold FROM profiles WHERE accountId = ?;';
				connection.query(query, [fields.id], (err, results) => {
					if (err) throw err;

					if (results[0].recruits <= 0) {
						res.status(400).write(log('Not enough recruits', fields.username, results[0].recruits, fields.id, fields.token));
						res.end();
						return;
					}

					if (results[0].gold < cost) {
						res.status(400).write(log('Not enough gold', fields.username, results[0].gold, fields.id, fields.token));
						res.end();
						return;
					}

					//update the profile with new values
					let query = 'UPDATE profiles SET gold = gold - ?, recruits = recruits - 1, soldiers = soldiers + ?, spies = spies + ?, scientists = scientists + ? WHERE accountId = ? AND gold >= ? AND recruits > 0;';
					connection.query(query, [cost, fields.role === 'soldier' ? 1 : 0, fields.role === 'spy' ? 1 : 0, fields.role === 'scientist' ? 1 : 0, fields.id, cost], (err) => {
						if (err) throw err;

						//send the new profile data as JSON (NOTE: possible duplication)
						let query = 'SELECT * FROM profiles WHERE accountId = ?;';
						connection.query(query, [fields.id], (err, results) => {
							if (err) throw err;

							//check just in case
							if (results.length !== 1) {
								res.status(400).write(log('Invalid recruit credentials', fields.username, fields.id, fields.token));
								res.end();
								return;
							}

							//results.length === 1
							res.status(200).json({
								username: fields.username, //TODO: join here
								gold: results[0].gold,
								recruits: results[0].recruits,
								soldiers: results[0].soldiers,
								spies: results[0].spies,
								scientists: results[0].scientists
							});
							res.end();
							log('Train executed', fields.username, fields.role, fields.id, fields.token);
						});
					});
				});
			});
		});
	});
}

const untrainRequest = (connection) => (req, res) => {
	//formidable handles forms
	let form = formidable.IncomingForm();

	//parse form
	form.parse(req, (err, fields) => {
		if (err) throw err;

		//verify the credentials (NOTE: duplication)
		let query = 'SELECT accountId FROM sessions WHERE accountId = ? AND token = ?;';
		connection.query(query, [fields.id, fields.token], (err, results) => {
			if (err) throw err;

			if (results.length !== 1) {
				res.status(400).write(log('Invalid untrain credentials', fields.username, fields.role, fields.id, fields.token));
				res.end();
				return;
			}

			//verify the role argument
			if (fields.role !== 'soldier' && fields.role !== 'spy' && fields.role !== 'scientist') {
				res.status(400).write(log('Invalid untrain parameters', fields.username, fields.role, fields.id, fields.token));
				res.end();
				return;
			}

			//can't untrain while attacking
			isAttacking(connection, fields.id, (err, attacking) => {
				if (err) throw err;
			
				if (attacking) {
					res.status(400).write(log('Can\'t untrain while attacking', fields.id));
					res.end();
					return;
				}

				//verify that the user has a high enough balance
				let query = 'SELECT soldiers, spies, scientists FROM profiles WHERE accountId = ?;';
				connection.query(query, [fields.id], (err, results) => {
					if (err) throw err;

					if (fields.role === 'soldier' && results[0].soldiers <= 0) {
						res.status(400).write(log('Not enough soldiers', fields.username, results[0].soldiers, fields.id, fields.token));
						res.end();
						return;
					}

					if (fields.role === 'spy' && results[0].spies <= 0) {
						res.status(400).write(log('Not enough spies', fields.username, results[0].spies, fields.id, fields.token));
						res.end();
						return;
					}

					if (fields.role === 'scientist' && results[0].scientists <= 0) {
						res.status(400).write(log('Not enough scientists', fields.username, results[0].scientists, fields.id, fields.token));
						res.end();
						return;
					}

					//hacky
					let role = null;
					if (fields.role === 'soldier') {
						role = 'soldiers';
					} else if (fields.role === 'spy') {
						role = 'spies';
					} else if (fields.role === 'scientist') {
						role = 'scientists';
					} else {
						res.status(400).write(log('Unknown role found', fields.role));
						res.end();
						return;
					}

					//update the profile with new values
					let query = `UPDATE profiles SET recruits = recruits + 1, soldiers = soldiers - ?, spies = spies - ?, scientists = scientists - ? WHERE accountId = ? AND ${role} > 0;`;
					connection.query(query, [fields.role === 'soldier' ? 1 : 0, fields.role === 'spy' ? 1 : 0, fields.role === 'scientist' ? 1 : 0, fields.id], (err) => {
						if (err) throw err;

						//send the new profile data as JSON (NOTE: possible duplication)
						let query = 'SELECT * FROM profiles WHERE accountId = ?;';
						connection.query(query, [fields.id], (err, results) => {
							if (err) throw err;

							//check just in case
							if (results.length !== 1) {
								res.status(400).write(log('Invalid untrain credentials', fields.username, fields.role, fields.id, fields.token));
								res.end();
								return;
							}

							//results.length === 1
							res.status(200).json({
								username: fields.username, //TODO: join here
								gold: results[0].gold,
								recruits: results[0].recruits,
								soldiers: results[0].soldiers,
								spies: results[0].spies,
								scientists: results[0].scientists
							});
							res.end();
							log('Untrain executed', fields.username, fields.role, fields.id, fields.token);
						});
					});
				});
			});
		});
	});
}

const ladderRequest = (connection) => (req, res) => {
	let query = 'SELECT username, soldiers, recruits, gold FROM accounts JOIN profiles ON accounts.id = profiles.accountId ORDER BY soldiers DESC, recruits DESC, gold DESC LIMIT ?, ?;';
	connection.query(query, [req.body.start, req.body.length], (err, results) => {
		if (err) throw err;

		res.status(200).json(results);
		log('Ladder sent', req.body.start, req.body.length, results);
	});
}

const runGoldTick = (connection) => {
	let goldTickJob = new CronJob('0 */30 * * * *', () => {
		let query = 'UPDATE profiles SET gold = gold + recruits;';
		connection.query(query, (err) => {
			if (err) throw err;

			log('Gold tick');
		});
	});

	goldTickJob.start();
}

module.exports = {
//	profileCreate: profileCreate, //NOTE: Not actually used
	profileRequest: profileRequest,
	recruitRequest: recruitRequest,
	trainRequest: trainRequest,
	untrainRequest: untrainRequest,
	ladderRequest: ladderRequest,
	runGoldTick: runGoldTick
}