var async = require('async');

var Poloniex = require('./apiPoloniex.js');

module.exports = function(logger){

    var _this = this;

    var portalConfig = JSON.parse(process.env.portalConfig);
    var poolConfigs = JSON.parse(process.env.pools);

    var logSystem = 'Profit';

    // 
    // build status tracker for collecting coin market information
    //
    var profitStatus = {};
    var profitSymbols = {};
    Object.keys(poolConfigs).forEach(function(coin){

        var poolConfig = poolConfigs[coin];
    	var algo       = poolConfig.coin.algorithm;

    	if (!profitStatus.hasOwnProperty(algo)) {
    		profitStatus[algo] = {};
    	}
    	var coinStatus = {
    		name: poolConfig.coin.name,
    		symbol: poolConfig.coin.symbol,
    		difficulty: 0,
    		reward: 0,
    		avgPrice: { BTC: 0, LTC: 0 },
    		avgDepth: { BTC: 0, LTC: 0 },
    		avgVolume: { BTC: 0, LTC: 0 },
    	    prices: {},
    		depths: {},
    		volumes: {},
    	};
    	profitStatus[algo][poolConfig.coin.symbol] = coinStatus;
    	profitSymbols[poolConfig.coin.symbol] = algo;
    });


    // 
    // ensure we have something to switch
    //
    var isMoreThanOneCoin = false;
    Object.keys(profitStatus).forEach(function(algo){
    	if (Object.keys(profitStatus[algo]).length > 1) {
    		isMoreThanOneCoin = true;
    	}
    });
    if (!isMoreThanOneCoin){
    	logger.debug(logSystem, 'Config', 'No alternative coins to switch to in current config, switching disabled.');
    	return;
    }
    logger.debug(logSystem, 'profitStatus', JSON.stringify(profitStatus));
    logger.debug(logSystem, 'profitStatus', JSON.stringify(profitSymbols));


    // 
    // setup APIs
    //
    var poloApi =  new Poloniex(
        // 'API_KEY',
    	// 'API_SECRET'
    );

    // 
    // market data collection from Poloniex
    //
    this.getProfitDataPoloniex = function(callback){
    	async.series([
    		function(taskCallback){
    			poloApi.getTicker(function(err, data){
    				if (err){
    					taskCallback(err);
    					return;
    				}
    				Object.keys(profitSymbols).forEach(function(symbol){
    					var btcPrice = new Number(0);
    					var ltcPrice = new Number(0);

    					if (data.hasOwnProperty('BTC_' + symbol)) {
    						btcPrice = new Number(data['BTC_' + symbol]);
    					}
    					if (data.hasOwnProperty('LTC_' + symbol)) {
    						ltcPrice = new Number(data['LTC_' + symbol]);
    					}

    					if (btcPrice > 0 || ltcPrice > 0) {
    						var prices = {
    							BTC: btcPrice,
    							LTC: ltcPrice
    						};
    						profitStatus[profitSymbols[symbol]][symbol].prices['Poloniex'] = prices;
    					}
    				});
    				taskCallback();
    			});
    		},
    		function(taskCallback){
    			poloApi.get24hVolume(function(err, data){
    				if (err){
    					taskCallback(err);
    					return;
    				}
    				Object.keys(profitSymbols).forEach(function(symbol){
    					var btcVolume = new Number(0);
    					var ltcVolume = new Number(0);

    					if (data.hasOwnProperty('BTC_' + symbol)) {
    						btcVolume = new Number(data['BTC_' + symbol].BTC);
    					}
    					if (data.hasOwnProperty('LTC_' + symbol)) {
    						ltcVolume = new Number(data['LTC_' + symbol].LTC);
    					}

    					if (btcVolume > 0 || ltcVolume > 0) {
    						var volumes = {
    							BTC: btcVolume,
    							LTC: ltcVolume
    						};
    						profitStatus[profitSymbols[symbol]][symbol].volumes['Poloniex'] = volumes;
    					}
    				});
    				taskCallback();
    			});
    		},
    	    function(taskCallback){
    			var depthTasks = [];
    			Object.keys(profitSymbols).forEach(function(symbol){
                    var coinVolumes = profitStatus[profitSymbols[symbol]][symbol].volumes;
                    var coinPrices  = profitStatus[profitSymbols[symbol]][symbol].prices;

    				if (coinVolumes.hasOwnProperty('Poloniex') && coinPrices.hasOwnProperty('Poloniex')){
    					var btcDepth = new Number(0);
    					var ltcDepth = new Number(0);

    					if (coinVolumes['Poloniex']['BTC'] > 0 && coinPrices['Poloniex']['BTC'] > 0){
    						var coinPrice = new Number(coinPrices['Poloniex']['BTC']);
    						depthTasks.push(function(callback){
                                _this.getMarketDepthFromPoloniex('BTC', symbol, coinPrice, callback)
    						});
    				    }
    					if (coinVolumes['Poloniex']['LTC'] > 0 && coinPrices['Poloniex']['LTC'] > 0){
    						var coinPrice = new Number(coinPrices['Poloniex']['LTC']);
    						depthTasks.push(function(callback){
                                _this.getMarketDepthFromPoloniex('LTC', symbol, coinPrice, callback)
    						});
    				    }
    				}
    		    });

    			if (depthTasks.length == 0){
    				taskCallback;
    				return;
    			}
    	        async.parallel(depthTasks, function(err){
    		        if (err){
                        logger.error(logSystem, 'Check', 'Error while checking profitability: ' + err);
    			        return;
    		        }
    				taskCallback();
    	        });
    		}
    	], function(err){
    		if (err){
                callback(err);
    			return;
    		}
    		callback(null);
    	});
    	
    };
    this.getMarketDepthFromPoloniex = function(symbolA, symbolB, coinPrice, callback){
    	poloApi.getOrderBook(symbolA, symbolB, function(err, data){
    		if (err){
    			callback(err);
    			return;
    		}
            var depth = new Number(0);
    		if (data.hasOwnProperty('bids')){
    			data['bids'].forEach(function(order){
    				var price = new Number(order[0]);
    				var qty = new Number(order[1]);
    				// only measure the depth down to configured depth
    				if (price >= coinPrice * portalConfig.profitSwitch.depth){
    				   depth += (qty * price);
    				}
    			});
    		}

    		if (!profitStatus[profitSymbols[symbolB]][symbolB].depths.hasOwnProperty('Poloniex')){
    		    profitStatus[profitSymbols[symbolB]][symbolB].depths['Poloniex'] = {
    			    BTC: 0,
    			    LTC: 0
    			};
    		}
    	    profitStatus[profitSymbols[symbolB]][symbolB].depths['Poloniex'][symbolA] = depth;
            callback();
    	});
    };

    // TODO
    this.getProfitDataCryptsy = function(callback){
        callback(null);
    };


    var checkProfitability = function(){
        logger.debug(logSystem, 'Check', 'Running profitability checks.');

    	async.parallel([
    	    _this.getProfitDataPoloniex,
    		_this.getProfitDataCryptsy
    	], function(err){
    		if (err){
                logger.error(logSystem, 'Check', 'Error while checking profitability: ' + err);
    			return;
    		}
            logger.debug(logSystem, 'Check', JSON.stringify(profitStatus));
    	});
    };
    setInterval(checkProfitability, portalConfig.profitSwitch.updateInterval * 1000);

};