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PKHeX/PKHeX.Core/Legality/RNG/RaidRNG.cs
Kurt bedc52943e Trailing commas 
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2021-08-20 13:49:20 -07:00

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using System.Linq;
using System.Runtime.CompilerServices;
namespace PKHeX.Core
{
/// <summary>
/// Logic for Generating and Verifying Gen8 Raid Templates against PKM data.
/// </summary>
public static class RaidRNG
{
public static bool Verify<T>(this T raid, PK8 pk8, ulong seed) where T: EncounterStatic8Nest<T>
{
var pi = PersonalTable.SWSH.GetFormEntry(raid.Species, raid.Form);
var ratio = pi.Gender;
var abil = RemapAbilityToParam(raid.Ability);
var IVs = raid.IVs.Count == 0 ? GetBlankIVTemplate() : PKX.ReorderSpeedLast((int[])((int[])raid.IVs).Clone());
return Verify(pk8, seed, IVs, raid.FlawlessIVCount, abil, ratio);
}
public static void ApplyDetailsTo<T>(this T raid, PK8 pk8, ulong seed) where T : EncounterStatic8Nest<T>
{
// Ensure the species-form is set correctly (nature)
pk8.Species = raid.Species;
pk8.Form = raid.Form;
var pi = PersonalTable.SWSH.GetFormEntry(raid.Species, raid.Form);
var ratio = pi.Gender;
var abil = RemapAbilityToParam(raid.Ability);
var IVs = raid.IVs.Count == 0 ? GetBlankIVTemplate() : PKX.ReorderSpeedLast((int[])((int[])raid.IVs).Clone());
ApplyDetailsTo(pk8, seed, IVs, raid.FlawlessIVCount, abil, ratio);
}
private static int RemapAbilityToParam(int a) => a switch
{
-1 => 254,
0 => 255,
_ => (a >> 1),
};
private static int[] GetBlankIVTemplate() => new[] {-1, -1, -1, -1, -1, -1};
private static bool Verify(PKM pk, ulong seed, int[] ivs, int iv_count, int ability_param, int gender_ratio, sbyte nature_param = -1, Shiny shiny = Shiny.Random)
{
var rng = new Xoroshiro128Plus(seed);
var ec = (uint)rng.NextInt();
if (ec != pk.EncryptionConstant)
return false;
uint pid;
bool isShiny;
if (shiny == Shiny.Random) // let's decide if it's shiny or not!
{
var trID = (uint)rng.NextInt();
pid = (uint)rng.NextInt();
isShiny = GetShinyXor(pid, trID) < 16;
}
else
{
// no need to calculate a fake trainer
pid = (uint)rng.NextInt();
isShiny = shiny == Shiny.Always;
}
ForceShinyState(pk, isShiny, ref pid);
if (pk.PID != pid)
return false;
const int UNSET = -1;
const int MAX = 31;
for (int i = ivs.Count(z => z == MAX); i < iv_count; i++)
{
int index = (int)rng.NextInt(6);
while (ivs[index] != UNSET)
index = (int)rng.NextInt(6);
ivs[index] = MAX;
}
for (int i = 0; i < 6; i++)
{
if (ivs[i] == UNSET)
ivs[i] = (int)rng.NextInt(32);
}
if (pk.IV_HP != ivs[0])
return false;
if (pk.IV_ATK != ivs[1])
return false;
if (pk.IV_DEF != ivs[2])
return false;
if (pk.IV_SPA != ivs[3])
return false;
if (pk.IV_SPD != ivs[4])
return false;
if (pk.IV_SPE != ivs[5])
return false;
int abil = ability_param switch
{
254 => (int)rng.NextInt(3),
255 => (int)rng.NextInt(2),
_ => ability_param,
};
abil <<= 1; // 1/2/4
var current = pk.AbilityNumber;
if (abil == 4)
{
if (current != 4)
return false;
}
// else, for things that were made Hidden Ability, defer to Ability Checks (Ability Patch)
switch (gender_ratio)
{
case PersonalInfo.RatioMagicGenderless when pk.Gender != 2:
if (pk.Gender != 2)
return false;
break;
case PersonalInfo.RatioMagicFemale when pk.Gender != 1:
if (pk.Gender != 1)
return false;
break;
case PersonalInfo.RatioMagicMale:
if (pk.Gender != 0)
return false;
break;
default:
var gender = (int)rng.NextInt(252) + 1 < gender_ratio ? 1 : 0;
if (pk.Gender != gender)
return false;
break;
}
if (nature_param == -1)
{
if (pk.Species == (int) Species.Toxtricity && pk.Form == 0)
{
var table = Nature0;
var choice = table[rng.NextInt((uint)table.Length)];
if (pk.Nature != choice)
return false;
}
else if (pk.Species == (int) Species.Toxtricity && pk.Form == 1)
{
var table = Nature1;
var choice = table[rng.NextInt((uint)table.Length)];
if (pk.Nature != choice)
return false;
}
else
{
var nature = (int)rng.NextInt(25);
if (pk.Nature != nature)
return false;
}
}
else
{
if (pk.Nature != nature_param)
return false;
}
if (pk is IScaledSize s)
{
var height = (int)rng.NextInt(0x81) + (int)rng.NextInt(0x80);
if (s.HeightScalar != height)
return false;
var weight = (int)rng.NextInt(0x81) + (int)rng.NextInt(0x80);
if (s.WeightScalar != weight)
return false;
}
return true;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static void ForceShinyState(PKM pk, bool isShiny, ref uint pid)
{
if (isShiny)
{
if (!GetIsShiny(pk.TID, pk.SID, pid))
pid = GetShinyPID(pk.TID, pk.SID, pid, 0);
}
else
{
if (GetIsShiny(pk.TID, pk.SID, pid))
pid ^= 0x1000_0000;
}
}
private static bool ApplyDetailsTo(PKM pk, ulong seed, int[] ivs, int iv_count, int ability_param, int gender_ratio, sbyte nature_param = -1, Shiny shiny = Shiny.Random)
{
var rng = new Xoroshiro128Plus(seed);
pk.EncryptionConstant = (uint)rng.NextInt();
uint pid;
bool isShiny;
if (shiny == Shiny.Random) // let's decide if it's shiny or not!
{
var trID = (uint)rng.NextInt();
pid = (uint)rng.NextInt();
isShiny = GetShinyXor(pid, trID) < 16;
}
else
{
// no need to calculate a fake trainer
pid = (uint)rng.NextInt();
isShiny = shiny == Shiny.Always;
}
if (isShiny)
{
if (!GetIsShiny(pk.TID, pk.SID, pid))
pid = GetShinyPID(pk.TID, pk.SID, pid, 0);
}
else
{
if (GetIsShiny(pk.TID, pk.SID, pid))
pid ^= 0x1000_0000;
}
pk.PID = pid;
const int UNSET = -1;
const int MAX = 31;
for (int i = ivs.Count(z => z == MAX); i < iv_count; i++)
{
int index = (int)rng.NextInt(6);
while (ivs[index] != UNSET)
index = (int)rng.NextInt(6);
ivs[index] = MAX;
}
for (int i = 0; i < 6; i++)
{
if (ivs[i] == UNSET)
ivs[i] = (int)rng.NextInt(32);
}
pk.IV_HP = ivs[0];
pk.IV_ATK = ivs[1];
pk.IV_DEF = ivs[2];
pk.IV_SPA = ivs[3];
pk.IV_SPD = ivs[4];
pk.IV_SPE = ivs[5];
int abil = ability_param switch
{
254 => (int)rng.NextInt(3),
255 => (int)rng.NextInt(2),
_ => ability_param,
};
pk.RefreshAbility(abil);
pk.Gender = gender_ratio switch
{
PersonalInfo.RatioMagicGenderless => 2,
PersonalInfo.RatioMagicFemale => 1,
PersonalInfo.RatioMagicMale => 0,
_ => (int) rng.NextInt(252) + 1 < gender_ratio ? 1 : 0,
};
int nature;
if (nature_param == -1)
{
if (pk.Species == (int)Species.Toxtricity && pk.Form == 0)
{
var table = Nature0;
nature = table[rng.NextInt((uint)table.Length)];
}
else if (pk.Species == (int)Species.Toxtricity && pk.Form == 1)
{
var table = Nature1;
nature = table[rng.NextInt((uint)table.Length)];
}
else
{
nature = (int)rng.NextInt(25);
}
}
else
{
nature = nature_param;
}
pk.StatNature = pk.Nature = nature;
if (pk is IScaledSize s)
{
var height = (int)rng.NextInt(0x81) + (int)rng.NextInt(0x80);
var weight = (int)rng.NextInt(0x81) + (int)rng.NextInt(0x80);
s.HeightScalar = height;
s.WeightScalar = weight;
}
return true;
}
private static uint GetShinyPID(int tid, int sid, uint pid, int type)
{
return (uint) (((tid ^ sid ^ (pid & 0xFFFF) ^ type) << 16) | (pid & 0xFFFF));
}
private static bool GetIsShiny(int tid, int sid, uint pid)
{
return GetShinyXor(pid, (uint) ((sid << 16) | tid)) < 16;
}
private static uint GetShinyXor(uint pid, uint oid)
{
var xor = pid ^ oid;
return (xor ^ (xor >> 16)) & 0xFFFF;
}
private static readonly int[] Nature0 = {3, 4, 2, 8, 9, 19, 22, 11, 13, 14, 0, 6, 24};
private static readonly int[] Nature1 = {1, 5, 7, 10, 12, 15, 16, 17, 18, 20, 21, 23};
}
}
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