Expansion Commodity Markets

this.name           = "mo-commodity_markets";
this.author         = "spara";
this.copyright      = "2013-2014 Mika Spåra";
this.description    = "Different prices for buying and selling in every station.";
this.version        = "1.2.3";
this.licence    	= "CC BY-NC-SA 3.0";

this.startUp = function() {
	
	//Market Observer is needed for showing buy prices in market.
	if (!worldScripts["market_observer"]) {
		for (prop in this.name) {
			if (prop !== 'name' && prop !== 'version') delete worldScripts[this.name][prop];
		}
		log(this.name, "Install marketObserver for mO-Commodity Markets to work. Exiting");
		player.consoleMessage("Install marketObserver for mO-Commodity Markets to work. Exiting.", 10);
	}
	
	this.$commodities = ["food","textiles","radioactives","slaves","liquor_wines","luxuries","narcotics","computers","machinery","alloys","firearms","furs","minerals","gold","platinum","gem_stones","alien_items"];
	this.$fixedPrices = false;//flag for prices' status
	
	//restore pricefactors
	if (missionVariables.commodityMarketsPriceFactors) {
		this.$priceFactor = JSON.parse(missionVariables.commodityMarketsPriceFactors);
	} 
	else {
		//init individual pricefactors
		this.$priceFactor = [];
		var i;
		for (i = 0; i < 17; i++) {
			this.$priceFactor.push(1.02 + 0.03 * Math.random());
		}
	}
	this.$createPrices();//init arrays
}

//set prices and start timer for fluctuating prices
this.shipDockedWithStation = function(station) {
	this.$renewPriceFactors();
	this.$createPrices();
}

this.shipWillLaunchFromStation = function(station) {
	//restore prices to averages when launching
	if (this.$fixedPrices) this.$restorePrices();
}

this.guiScreenChanged = function(to, from) {
	if (!player.ship.docked) return;	
	//fix prices when switching to market screen
	if (guiScreen === "GUI_SCREEN_MARKET" && !this.$fixedPrices) {
		for (i = 0; i < 17; i++) 
			player.ship.dockedStation.setMarketPrice(this.$commodities[i], this.$sellPrices[i]);
		this.$fixedPrices = true;
		//make a list of scripts to notify about buying and selling
		this.$collectNotifyScripts();
		return;
	}
	//restore median prices when leaving market screen
	if (guiScreen !== "GUI_SCREEN_MARKET" && this.$fixedPrices) {
		this.$restorePrices();
	}	
}

//restore original prices
this.$restorePrices = function(){
	for (i = 0; i < 17; i++) 
		player.ship.dockedStation.setMarketPrice(this.$commodities[i], this.$originalPrices[i]);
	this.$fixedPrices = false;
}

//create arrays for original, buy and sell prices
this.$createPrices = function() {
	var i, newPrice, commodity;
	this.$buyPrices = [];
	this.$sellPrices = [];
	this.$originalPrices = [];
	for (i = 0; i < 17; i ++) {
		commodity = this.$commodities[i];
		var priceFactor = this.$priceFactor[i];
		this.$originalPrices.push(player.ship.dockedStation.market[commodity].price);
		//buy prices
		newPrice = priceFactor * this.$originalPrices[i];
		if (newPrice > 1020) newPrice = 1020;
		this.$buyPrices.push(newPrice);
		//sell prices
		newPrice = this.$originalPrices[i] / priceFactor;
		this.$sellPrices.push(newPrice);
	}
}

//5% change for individual commodity prices to fluctuate
this.$renewPriceFactors = function() {
	for (i = 0; i < 17; i ++) {
		if (Math.random() < 0.05)
			this.$priceFactor[i] = 1.02 + 0.03 * Math.random();		
	}
}

//handle buying
this.$playerBoughtCargo = function(commodity, units, price) {
	//return, if original prices
	if (!this.$fixedPrices) return [units, price];
	//return, if price is correct to circumvent continuous looping
	var commIndex = this.$commodities.indexOf(commodity);
	if (price === this.$buyPrices[commIndex]) return [units, price];
	//reverse buying with sell prices
	player.ship.dockedStation.setMarketQuantity(commodity, (player.ship.dockedStation.market[commodity].quantity + units));
	player.credits += (units * price) / 10;
	player.ship.manifest[commodity] -= units;
	//notify other scripts about reversing
	//this.$notifySell(commodity, units, price);
	//buy again with correct prices
	var unitsBought = 0;
	while (unitsBought < units && player.credits >= Math.round(this.$buyPrices[commIndex])/10) {
		player.ship.dockedStation.setMarketQuantity(commodity, (player.ship.dockedStation.market[commodity].quantity - 1));	
		player.credits -= this.$buyPrices[commIndex] / 10;
		player.ship.manifest[commodity] += 1;
		unitsBought++;
	}
	//notify other scripts about buying
	/*
	if (unitsBought > 0) {
		this.$notifyBuy(commodity, unitsBought, this.$buyPrices[commIndex]);
	}
	*/
	return [unitsBought, this.$buyPrices[commIndex]];
}

//make a list of scripts to notify about buying and selling
this.$collectNotifyScripts = function() {
	this.$buyScripts = [];
	this.$sellScripts = [];
	for (i = 0; i < worldScriptNames.length; i++) {
		scriptName = worldScriptNames[i];
		if (worldScripts[scriptName] && scriptName !== "market_observer" && worldScripts[scriptName].playerSoldCargo)
			this.$sellScripts.push(scriptName);
		if (worldScripts[scriptName] && scriptName !== this.name && scriptName !== "market_observer" && worldScripts[scriptName].playerBoughtCargo)
			this.$buyScripts.push(scriptName);			
	}	
}

//notify other scripts about selling
this.$notifySell = function(commodity, units, price) {
	var i, scriptName;
	this.$notifyScripts = [];
	for (i = 0; i < this.$sellScripts.length; i++) {
		scriptName = this.$sellScripts[i];
		if (worldScripts[scriptName].playerSoldCargo)
			worldScripts[scriptName].playerSoldCargo(commodity, units, price);
	}	
}

//notify other scripts about buying
this.$notifyBuy = function(commodity, units, price) {
	var i, scriptName;
	this.$notifyScripts = [];
	for (i = 0; i < this.$buyScripts.length; i++) {
		scriptName = this.$buyScripts[i];
		if (worldScripts[scriptName].playerBoughtCargo) 
			worldScripts[scriptName].playerBoughtCargo(commodity, units, price);
	}	
}

//save pricefactors
this.playerWillSaveGame = function() {
	missionVariables.commodityMarketsPriceFactors = JSON.stringify(this.$priceFactor);
}