import UIKit

// Models code
struct Player: Decodable {
    var id: Int
    var name: String?
}

struct Game: Decodable {
    var name: String
    var playerId1: Int
    var playerId2: Int
    var player1: Player?
    var player2: Player?

    init(from decoder: Decoder, allPlayers: [Player]) throws {
        let values = try decoder.container(keyedBy: CodingKeys.self)

        name = try values.decode(String.self, forKey: .name)

        playerId1 = try values.decode(Int.self, forKey: .player1)
        playerId2 = try values.decode(Int.self, forKey: .player2)

        player1 = allPlayers.first{ $0.id == playerId1 }
        player2 = allPlayers.first{ $0.id == playerId2 }
    }
}


// ViewModel code
let playersResponse = """
[
    {
        "id": 1,
        "name": "John Doe"
    },
    {
        "id": 15,
        "name": "Jessica Thump"
    }
]
"""

let gamesResponse = """
[
    {
        "name": "Tic Tac Toe",
        "playerId1": 15,
        "playerId2": 1
    }
]
"""

let players = try! JSONDecoder().decode([Player].self, from: playersResponse.data(using: .utf8)!)
let games = try! JSONDecoder().decode([Game].self, from: gamesResponse.data(using: .utf8)!, allPlayers: players)  // <-- DOES NOT WORK "Extra argument 'allPlayers' in call"