this.name           = "mo-commodity_markets";
this.author         = "spara";
this.copyright      = "2013 Mika Spåra";
this.description    = "Different prices for buying and selling in every station.";
this.version        = "1.1-deva";
this.licence        = "CC BY-NC-SA 3.0";

//1.1 removed market fluctuating code. Too much complication and player probbly doesn't even notice it.
//1.1 original prices array updated on every change to market screen to give room for price changing oxp's.

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

    if (missionVariables.commodityMarketsPriceFactors) {
        this.$priceFactor = JSON.parse(missionVariables.commodityMarketsPriceFactors);
    }
    else {
        this.$priceFactor = [];
        var i;
        //init individual pricefactors
        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.$fixedPrices) return;
    //return, if price is correct to circumvent continuous looping
    var commIndex = this.$commodities.indexOf(commodity);
    if (price === this.$buyPrices[commIndex]) return;
    //reverse buying with sell prices
    player.ship.dockedStation.setMarketQuantity(commodity, (player.ship.dockedStation.market[commodity].quantity + units));
    player.credits += (units * price) / 10;
    player.ship.manifest[commodity] -= units;
    //notify other scripts about reversing
    this.$notifySell(commodity, units, price);
    //buy again with correct prices
    var unitsBought = 0;
    while (unitsBought < units && player.credits > 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]);
    }
}

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

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