GildedRose.swift

import GildedRose

let items = [
    Item(name: "+5 Dexterity Vest", sellIn: 10, quality: 20),
    Item(name: "Aged Brie", sellIn: 2, quality: 0),
    Item(name: "Elixir of the Mongoose", sellIn: 5, quality: 7),
    Item(name: "Sulfuras, Hand of Ragnaros", sellIn: 0, quality: 80),
    Item(name: "Sulfuras, Hand of Ragnaros", sellIn: -1, quality: 80),
    Item(name: "Backstage passes to a TAFKAL80ETC concert", sellIn: 15, quality: 20),
    Item(name: "Backstage passes to a TAFKAL80ETC concert", sellIn: 10, quality: 49),
    Item(name: "Backstage passes to a TAFKAL80ETC concert", sellIn: 5, quality: 49),
    // this conjured item does not work properly yet
    Item(name: "Conjured Mana Cake", sellIn: 3, quality: 6)]

let app = GildedRose(items: items);

// All items have a SellIn value which denotes the number of days we have to sell the item
func checkForSellIn() {
    var missed = []
    for var i = 0; i < items!.count ; ++i {
        if(items[i].sellIn == nil){
            print("--- missing sellIn found on \(item[i].name) ---")
            missed.append(item[i])
        }

    }
    return missed
}

// All items have a Quality value which denotes how valuable the item is
func checkForQuality() {
    var missed = []
    for var i = 0; i < items!.count ; ++i {
        if(items[i].quality == nil){
            print("--- missing quality found on \(item[i].name) ---")
            missed.append(item[i])
        }

    }
    return missed
}

// At the end of each day our system lowers both values for every item
func lowAtEndOfDay() {
    for var i = 0; i < items!.count ; ++i {
        if(items[i].quality != nil && items[i].sellIn != nil){
            print("--- lowing in \(item[i].name) ---")
            // At the end of each day our system lowers both values for every item
            decideHowToLow(items[i])
            handleLowSellIn(items[i])
        }

    }
}

func handleLowSellIn(item) {
    item.sellIn -= 1
}

func decideHowToLow() {
    if(item.name.contains("Conjured")){
        handleLowQuality(item, 2)
        return
    }else {
        handleLowQuality(item, 1)
    }
}

func handleLowQuality(item, lowValue) {

    if(item.name === "Aged Brie") {
        item.quality += lowValue
        return
    }
    if(item.quality>49 || item.name == "Sulfuras") {
        return
    }
    if(item.quality == "Backstage passes") {
        if( item.sellIn < 1 ){
            item.quality = 0
        }
        else if(item.sellIn < 6){
            item.quality += (lowValue + 2)
        }
        else if(item.sellIn < 11){
            item.quality += (lowValue + 1)
        }else {
            item.quality -= lowValue
        }
    }
    if(item.sellIn<0) {
        item.quality -= (lowValue + 1)
    } 
    if(item.quality < 1) {
        item.quality = 0
    }else{
        item.quality -= lowValue
    }
}


for i in 0..<days {
    print("-------- day \(i) --------");
    print("name, sellIn, quality");
    for item in items {
        print(item);
    }
    print("");
    app.updateQuality();
}