Swift structured based chess

lessonFriday.swift

enum CubeColorType {
    case white
    case black
    case none
}

class Cube {
    var color: CubeColorType
    var perviousCube: Cube?
    var numeration: Int
    var id: Int = 0
    
    init(color: CubeColorType, previousCube: Cube?, numeration: Int, id: Int) {
        self.color = color
        self.perviousCube = previousCube
        self.numeration = numeration
        self.id = id
    }
}


struct ChessBoard {
    var cubes: [Cube] = []
    
    mutating func fillCubes() -> [Cube] {
        let firstCube = Cube(color: .white, previousCube: nil, numeration: 1, id: 1)
        cubes.append(firstCube)
        
        for index in 0...69 {
            let newCube = createNewCubeOnIndex(index: index)
            cubes.append(newCube)
        }
        
        return cubes
    }
    
    mutating func fillCubesForIOS() -> [Cube] {
        let firstCube = Cube(color: .white, previousCube: nil, numeration: 1, id: 1)
        cubes.append(firstCube)
        
        for index in 0...62 {
            let newCube = createNewCubeForiOS(index: index)
            cubes.append(newCube)
        }
        
        return cubes
    }
    
    func createNewCubeForiOS(index: Int) -> Cube {
        if cubes[index].id % 8 == 0 {
            let newCube = Cube(color: cubes[index].color, previousCube: cubes[index].perviousCube, numeration: cubes[index].numeration + 1, id: cubes[index].id + 1)
            return newCube
        }
        
        let currentCube = cubes[index]
        let nextCubeColor = getCorrectColor(color: currentCube.color)
        let newCube = Cube(color: nextCubeColor, previousCube: currentCube, numeration: currentCube.numeration + 1, id: currentCube.id + 1)
        return newCube
    }
    
    func createNewCubeOnIndex(index: Int) -> Cube {
        if index != 0 && cubes[index].numeration % 8 == 0 {
            let currentCube = cubes[index]
            let emptyCube = Cube(color: .none, previousCube: currentCube, numeration: currentCube.numeration + 1, id: currentCube.id + 1)
            return emptyCube
        }
        let currentCube = cubes[index]
        
        if currentCube.color == .none {
            let newLineCube = Cube(color: currentCube.perviousCube!.color, previousCube: currentCube, numeration: 1, id: currentCube.id + 1)
            
            return newLineCube
        }
        
        let nextCubeColor = getCorrectColor(color: currentCube.color)
        let newCube = Cube(color: nextCubeColor, previousCube: currentCube, numeration: currentCube.numeration + 1, id: currentCube.id + 1)
        return newCube
    }
    
    func getCorrectColor(color: CubeColorType) -> CubeColorType {
        switch color {
        case .white:
            return CubeColorType.black
        case .black:
            return CubeColorType.white
        case .none:
            return CubeColorType.none
        }
    }
}