Facede.swift

class TreasureMap {
    
    enum Treasures {
        case GALLEON
        case BURIED_GOLD
        case SUNKEN_JEWELS
    }
    
    struct MapLocation {
        let gridLetter: Character
        let gridNumber: UInt
    }
    
    func findTreasure(type:Treasures) -> MapLocation {
        switch type {
        case .GALLEON:
            return MapLocation(gridLetter: "D", gridNumber: 6)
        case .BURIED_GOLD:
            return MapLocation(gridLetter: "C", gridNumber: 2)
        case .SUNKEN_JEWELS:
            return MapLocation(gridLetter: "F", gridNumber: 12)
        }
    }
}

class PirateShip {
    
    struct ShipLocation {
        let NorthSouth: Int
        let EastWest: Int
    }
    
    var currentPosition: ShipLocation
    var movementQueue = dispatch_queue_create("shipQ", DISPATCH_QUEUE_SERIAL)
    
    init() {
        currentPosition = ShipLocation(NorthSouth: 5, EastWest: 5)
    }
    
    func moveToLocation(location:ShipLocation, callback:(ShipLocation) -> Void) {
        dispatch_async(movementQueue, {() in
            self.currentPosition = location
            callback(self.currentPosition)
        })
    }
}

class PirateCrew {
    let workQueue = dispatch_queue_create("crewWorkQ", DISPATCH_QUEUE_SERIAL)
    
    enum Actions {
        case ATTACK_SHIP
        case DIG_FOR_GOLD
        case DIVE_FOR_JEWELS
    }
    
    func performAction(action:Actions, callback:(Int) -> Void) {
        dispatch_async(workQueue, {() in
            var prizeValue = 0
            switch (action) {
            case .ATTACK_SHIP:
                prizeValue = 10000
            case .DIG_FOR_GOLD:
                prizeValue = 5000
            case .DIVE_FOR_JEWELS:
                prizeValue = 1000
            }
            callback(prizeValue)
        })
    }
}

let map = TreasureMap()
let ship = PirateShip()
let crew = PirateCrew()

let treasureLocation = map.findTreasure(TreasureMap.Treasures.GALLEON)
let sequence:[Character] = ["A", "B", "C", "D", "E", "F", "G"]
let eastWestPos = sequence.indexOf(treasureLocation.gridLetter)
let shipTarget = PirateShip.ShipLocation(NorthSouth: Int(treasureLocation.gridNumber), EastWest: eastWestPos!)

ship.moveToLocation(shipTarget, callback: { location in
    crew.performAction(PirateCrew.Actions.ATTACK_SHIP, callback: { prize in
        print("Prize: \(prize) pieces of eight")
    })
})

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