kata.swift

import XCTest


typealias Quality = Int
typealias SellIn = Int
typealias UpdateRule = (Quality, SellIn) -> Quality


enum ItemType {
    case normal
    case sulfuras
    case brie
    case backstage
    
    var updateRule: UpdateRule {
        switch self {
        case .normal:
            return { quality, _ in max(0, quality-1) }
        case .sulfuras:
            return { quality, _ in quality }
        case .brie:
            return { quality, _ in min(quality+1, 50) }
        case .backstage:
            return { quality, sellin in  }
        }
    }
}

// GlidedRose.swift
public class GildedRose {
    var items: [Item]
    
    required public init(items: [Item]) {
        self.items = items
    }
    
    public func updateQuality() {
        
        for i in 0..<items.count {
            if (items[i].name != "Aged Brie" && items[i].name != "Backstage passes to a TAFKAL80ETC concert") {
                if (items[i].quality > 0) {
                    if (items[i].name != "Sulfuras, Hand of Ragnaros") {
                        items[i].quality = items[i].quality - 1
                    }
                }
            } else {
                if (items[i].quality < 50) {
                    items[i].quality = items[i].quality + 1
                    
                    if (items[i].name == "Backstage passes to a TAFKAL80ETC concert") {
                        if (items[i].sellIn < 11) {
                            if (items[i].quality < 50) {
                                items[i].quality = items[i].quality + 1
                            }
                        }
                        
                        if (items[i].sellIn < 6) {
                            if (items[i].quality < 50) {
                                items[i].quality = items[i].quality + 1
                            }
                        }
                    }
                }
            }
            
            if (items[i].name != "Sulfuras, Hand of Ragnaros") {
                items[i].sellIn = items[i].sellIn - 1
            }
            
            if (items[i].sellIn < 0) {
                if (items[i].name != "Aged Brie") {
                    if (items[i].name != "Backstage passes to a TAFKAL80ETC concert") {
                        if (items[i].quality > 0) {
                            if (items[i].name != "Sulfuras, Hand of Ragnaros") {
                                items[i].quality = items[i].quality - 1
                            }
                        }
                    } else {
                        items[i].quality = items[i].quality - items[i].quality
                    }
                } else {
                    if (items[i].quality < 50) {
                        items[i].quality = items[i].quality + 1
                    }
                }
            }
        }
    }
}



// Item.swift
public struct Item {
    public var name: String
    public var sellIn: Int
    public var quality: Int
    
    public init(name: String, sellIn: Int, quality: Int) {
        self.name = name
        self.sellIn = sellIn
        self.quality = quality
    }
}

extension Item: CustomStringConvertible {
    public var description: String {
        return self.name + ", " + String(self.sellIn) + ", " + String(self.quality);
    }
}


// main.swift
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);

var days = 2;
if (CommandLine.argc > 1) {
    days = Int(CommandLine.arguments[1])! + 1
}


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

func testFoo() {
    let items = [Item(name: "foo", sellIn: 0, quality: 0)]
    let app = GildedRose(items: items);
    app.updateQuality();
//    XCTAssertEqual("fixme", app.items[0].name);
}

testFoo()