5dplomacy/MultiversalDiplomacy/Model/Unit.cs

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namespace MultiversalDiplomacy.Model;
/// <summary>
/// Represents a unit at a particular point in time.
/// </summary>
public class Unit
{
/// <summary>
/// The previous iteration of a unit. This is null if the unit was just built.
/// </summary>
public Unit? Past { get; }
/// <summary>
/// The location on the map where the unit is.
/// </summary>
public Location Location { get; }
/// <summary>
/// The province where the unit is.
/// </summary>
public Province Province => this.Location.Province;
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/// <summary>
/// The season in time when the unit is.
/// </summary>
public Season Season { get; }
/// <summary>
/// The allegiance of the unit.
/// </summary>
public Power Power { get; }
/// <summary>
/// The type of unit.
/// </summary>
public UnitType Type { get; }
/// <summary>
/// The unit's spatiotemporal location as a province-season tuple.
/// </summary>
public (Province province, Season season) Point => (this.Province, this.Season);
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private Unit(Unit? past, Location location, Season season, Power power, UnitType type)
{
this.Past = past;
this.Location = location;
this.Season = season;
this.Power = power;
this.Type = type;
}
public override string ToString()
{
return $"{this.Power.Name[0]} {this.Type.ToShort()} {(this.Province, this.Season).ToShort()}";
}
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/// <summary>
/// Create a new unit. No validation is performed; the adjudicator should only call this
/// method after accepting a build order.
/// </summary>
public static Unit Build(Location location, Season season, Power power, UnitType type)
=> new Unit(past: null, location, season, power, type);
/// <summary>
/// Advance this unit's timeline to a new location and season.
/// </summary>
public Unit Next(Location location, Season season)
=> new Unit(past: this, location, season, this.Power, this.Type);
}