module default {

  type GameBoard {
    overloaded required id: uuid {
      readonly := true;
      constraint exclusive;
    }
    url: str {
      readonly := true;
    }
    required created_at: datetime {
      readonly := true;
    }
    required turns: int32 {
      readonly := true;
    }
    required map: str {
      readonly := true;
    }
    required single type: GameType {
      readonly := true;
      constraint exclusive;
      on source delete delete target;
    }
    required single ruleset: Ruleset {
      readonly := true;
      constraint exclusive;
      on source delete delete target;
    }
    required winner: str {
      readonly := true;
    }
    required multi moves: Moves {
      readonly := true;
      on source delete delete target;
    }
    single snake: Snake {
      readonly := true;
      on source delete delete target;
      on target delete allow;
    }
  }

  type GameType {
    required name: str {
      readonly := true;
    }
    required is_ladder: bool {
      readonly := true;
    }
    #constraint exclusive on ( (.name, .is_ladder) );
  }

  type Ruleset {
    required name: str {
      readonly := true;
    }
    required version: str {
      readonly := true;
    }
    required settings: json {
      readonly := true;
    }
    #constraint exclusive on ( (.name, .version, .settings) );
  }

  type Snake {
    required type: str {
      readonly := true;
    }
    #constraint exclusive on .type;
  }

  type Moves {
    required turn: int32 {
      readonly := true;
    }
    required snake_move: str {
      readonly := true;
    }
    required game_board: json {
      readonly := true;
    }
    single calculations: Calculations {
      readonly := true;
      on source delete delete target;
      on target delete allow;
    }
  }

  type Calculations {
    required data: array<json> {
      readonly := true;
    }
  }

}