PKHeX/PKHeX.Core/Legality/Evolutions/EvolutionMethod.cs

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using static PKHeX.Core.EvolutionType;
namespace PKHeX.Core
{
/// <summary>
/// Criteria for evolving to this branch in the <see cref="EvolutionTree"/>
/// </summary>
public sealed class EvolutionMethod
{
/// <summary>
/// Evolution Method
/// </summary>
public readonly int Method;
/// <summary>
/// Evolve to Species
/// </summary>
public readonly int Species;
/// <summary>
/// Conditional Argument (different from <see cref="Level"/>)
/// </summary>
public readonly int Argument;
/// <summary>
/// Conditional Argument (different from <see cref="Argument"/>)
/// </summary>
public readonly int Level;
/// <summary>
/// Destination Form
/// </summary>
/// <remarks>Is <see cref="AnyForm"/> if the evolved form isn't modified. Special consideration for <see cref="LevelUpFormFemale1"/>, which forces 1.</remarks>
public readonly int Form;
private const int AnyForm = -1;
// Not stored in binary data
public bool RequiresLevelUp; // tracks if this method requires a Level Up, lazily set
public EvolutionMethod(int method, int species, int argument = 0, int level = 0, int form = AnyForm)
{
Method = method;
Species = species;
Argument = argument;
Form = form;
Level = level;
}
public override string ToString() => $"{(Species) Species}-{Form} [{Argument}] @ {Level}{(RequiresLevelUp ? "X" : "")}";
/// <summary>
/// Returns the form that the Pok<6F>mon will have after evolution.
/// </summary>
/// <param name="form">Un-evolved Form ID</param>
public int GetDestinationForm(int form)
{
if (Method == (int)LevelUpFormFemale1)
return 1;
if (Form == AnyForm)
return form;
return Form;
}
/// <summary>
/// Checks the <see cref="EvolutionMethod"/> for validity by comparing against the <see cref="PKM"/> data.
/// </summary>
/// <param name="pkm">Entity to check</param>
/// <param name="lvl">Current level</param>
/// <param name="skipChecks">Option to skip some comparisons to return a 'possible' evolution.</param>
/// <returns>True if a evolution criteria is valid.</returns>
public bool Valid(PKM pkm, int lvl, bool skipChecks)
{
RequiresLevelUp = false;
switch ((EvolutionType)Method)
{
case UseItem or UseItemWormhole:
case CriticalHitsInBattle or HitPointsLostInBattle or Spin:
case TowerOfDarkness or TowerOfWaters:
return true;
case UseItemMale:
return pkm.Gender == 0;
case UseItemFemale:
return pkm.Gender == 1;
case Trade or TradeHeldItem or TradeShelmetKarrablast:
return !pkm.IsUntraded || skipChecks;
// Special Level Up Cases -- return false if invalid
case LevelUpNatureAmped or LevelUpNatureLowKey when GetAmpLowKeyResult(pkm.Nature) != pkm.Form && !skipChecks:
return false;
case LevelUpBeauty when pkm is not IContestStats s || s.CNT_Beauty < Argument:
return skipChecks;
case LevelUpMale when pkm.Gender != 0:
return false;
case LevelUpFemale when pkm.Gender != 1:
return false;
case LevelUpFormFemale1 when pkm.Gender != 1 || pkm.Form != 1:
return false;
case LevelUpVersion or LevelUpVersionDay or LevelUpVersionNight when ((pkm.Version & 1) != (Argument & 1) && pkm.IsUntraded) || skipChecks:
return skipChecks; // Version checks come in pairs, check for any pair match
// Level Up (any); the above Level Up (with condition) cases will reach here if they were valid
default:
if (Level == 0 && lvl < 2)
return false;
if (lvl < Level)
return false;
RequiresLevelUp = true;
if (skipChecks)
return lvl >= Level;
// Check Met Level for extra validity
return HasMetLevelIncreased(pkm, lvl);
}
}
private bool HasMetLevelIncreased(PKM pkm, int lvl)
{
int origin = pkm.Generation;
return origin switch
{
// No met data in RBY; No met data in GS, Crystal met data can be reset
1 or 2 => true,
// Pal Park / PokeTransfer updates Met Level
3 or 4 => pkm.Format > origin || pkm.Met_Level < lvl,
// 5=>6 and later transfers keep current level
>=5 => lvl >= Level && (!pkm.IsNative || pkm.Met_Level < lvl),
_ => false,
};
}
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public EvoCriteria GetEvoCriteria(int species, int form, int lvl) => new(species, form)
{
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Level = lvl,
Method = Method,
};
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public static int GetAmpLowKeyResult(int n)
{
var index = n - 1;
if ((uint)index > 22)
return 0;
return (0b_0101_1011_1100_1010_0101_0001 >> index) & 1;
}
}
}