mirror of
https://github.com/kwsch/PKHeX
synced 2024-11-14 16:27:21 +00:00
212 lines
7.2 KiB
C#
212 lines
7.2 KiB
C#
using System;
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namespace PKHeX.Core;
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/// <summary>
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/// Logic for calculating a Hidden Power Type based on IVs and generation-format.
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/// </summary>
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public static class HiddenPower
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{
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/// <summary>
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/// Gets the current Hidden Power Type of the input <see cref="IVs"/> for the requested format generation.
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/// </summary>
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/// <param name="IVs">Current IVs</param>
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/// <returns>Hidden Power Type of the <see cref="IVs"/></returns>
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/// <param name="context">Generation format</param>
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public static int GetType(ReadOnlySpan<int> IVs, EntityContext context)
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{
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if (context.Generation() <= 2)
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return GetTypeGB(IVs);
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return GetType(IVs);
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}
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/// <summary>
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/// Gets the current Hidden Power Type of the input <see cref="IVs"/> for Generations 3+
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/// </summary>
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/// <param name="IVs">Current IVs</param>
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/// <returns>Hidden Power Type of the <see cref="IVs"/></returns>
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public static int GetType(ReadOnlySpan<int> IVs)
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{
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int hp = 0;
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for (int i = 0; i < 6; i++)
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hp |= (IVs[i] & 1) << i;
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return SixBitType[hp];
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}
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private static ReadOnlySpan<byte> SixBitType => new byte[]
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{
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// (low-bit mash) * 15 / 63
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00, 00, 00, 00, 00, 01, 01, 01,
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01, 02, 02, 02, 02, 03, 03, 03,
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03, 04, 04, 04, 04, 05, 05, 05,
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05, 05, 06, 06, 06, 06, 07, 07,
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07, 07, 08, 08, 08, 08, 09, 09,
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09, 09, 10, 10, 10, 10, 10, 11,
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11, 11, 11, 12, 12, 12, 12, 13,
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13, 13, 13, 14, 14, 14, 14, 15,
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};
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/// <summary>
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/// Gets the current Hidden Power Type of the input <see cref="IVs"/> for Generations 1 & 2
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/// </summary>
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/// <param name="IVs">Current IVs</param>
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/// <returns>Hidden Power Type of the <see cref="IVs"/></returns>
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public static int GetTypeGB(ReadOnlySpan<int> IVs)
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{
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var atk = IVs[1];
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var def = IVs[2];
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return ((atk & 3) << 2) | (def & 3);
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}
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/// <summary>
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/// Modifies the provided <see cref="IVs"/> to have the requested <see cref="hiddenPowerType"/> for Generations 1 & 2
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/// </summary>
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/// <param name="hiddenPowerType">Hidden Power Type</param>
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/// <param name="IVs">Current IVs</param>
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/// <returns>True if the Hidden Power of the <see cref="IVs"/> is obtained, with or without modifications</returns>
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public static bool SetTypeGB(int hiddenPowerType, Span<int> IVs)
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{
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IVs[1] = (IVs[1] & 0b1100) | (hiddenPowerType >> 2);
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IVs[2] = (IVs[2] & 0b1100) | (hiddenPowerType & 3);
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return true;
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}
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/// <summary>
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/// Modifies the provided <see cref="IVs"/> to have the requested <see cref="hiddenPowerType"/>.
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/// </summary>
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/// <param name="hiddenPowerType">Hidden Power Type</param>
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/// <param name="IVs">Current IVs (6 total)</param>
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/// <param name="context">Generation format</param>
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/// <returns>True if the Hidden Power of the <see cref="IVs"/> is obtained, with or without modifications</returns>
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public static bool SetIVsForType(int hiddenPowerType, Span<int> IVs, EntityContext context)
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{
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if (context.Generation() <= 2)
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return SetTypeGB(hiddenPowerType, IVs);
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return SetIVsForType(hiddenPowerType, IVs);
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}
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/// <summary>
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/// Sets the <see cref="IVs"/> to the requested <see cref="hpVal"/> for Generation 3+ game formats.
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/// </summary>
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/// <param name="hpVal">Hidden Power Type</param>
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/// <param name="IVs">Current IVs (6 total)</param>
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/// <returns>True if the Hidden Power of the <see cref="IVs"/> is obtained, with or without modifications</returns>
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public static bool SetIVsForType(int hpVal, Span<int> IVs)
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{
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int current = GetType(IVs);
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if (current == hpVal)
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return true; // no mods necessary
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int flawlessCount = IVs.Count(31);
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if (flawlessCount == 0)
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return false;
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if (flawlessCount == IVs.Length)
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{
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SetIVs(hpVal, IVs); // Get IVs
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return true;
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}
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// Required HP type doesn't match IVs. Make currently-flawless IVs flawed.
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var bits = GetSuggestedHiddenPowerIVs(hpVal, IVs);
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if (bits == NoResult)
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return false; // can't force hidden power?
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// set IVs back to array
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ForceLowBits(IVs, bits);
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return true;
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}
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private const byte NoResult = byte.MaxValue;
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private static byte GetSuggestedHiddenPowerIVs(int hpVal, ReadOnlySpan<int> IVs)
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{
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// Iterate through all bit combinations that yield our Hidden Power Type.
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// There's at most 5 we need to check, so brute force is fine.
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// Prefer the least amount of IVs changed (31 -> 30).
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// Get the starting index from our 64 possible bit states.
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int index = SixBitType.IndexOf((byte)hpVal);
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if (index == -1)
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return NoResult;
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var bestIndex = NoResult;
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var bestIndexFlaws = 6;
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do
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{
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var flaws = GetFlawedBitCount(IVs, index);
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if (flaws >= bestIndexFlaws)
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continue;
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bestIndex = (byte)index;
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bestIndexFlaws = flaws;
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} while (++index < SixBitType.Length && SixBitType[index] == hpVal);
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return bestIndex;
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}
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private static int GetFlawedBitCount(ReadOnlySpan<int> ivs, int bitValue)
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{
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const int max = 31;
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int flaws = 0;
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for (int i = 0; i < ivs.Length; i++)
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{
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var iv = ivs[i];
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if ((iv & 1) == (bitValue & (1 << i)))
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continue; // ok
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if (iv != max)
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return NoResult;
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flaws++;
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}
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return flaws;
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}
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/// <summary>Calculate the Hidden Power Type of the entered IVs.</summary>
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/// <param name="type">Hidden Power Type</param>
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/// <param name="ivs">Individual Values (H/A/B/S/C/D)</param>
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/// <param name="context">Generation specific format</param>
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public static void SetIVs(int type, Span<int> ivs, EntityContext context = PKX.Context)
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{
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if (context.Generation() <= 2)
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{
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ivs[1] = (ivs[1] & 0b1100) | (type >> 2);
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ivs[2] = (ivs[2] & 0b1100) | (type & 3);
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}
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else
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{
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ForceLowBits(ivs, DefaultLowBits[type]);
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}
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}
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private static void ForceLowBits(Span<int> ivs, byte bits)
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{
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for (int i = 0; i < ivs.Length; i++)
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ivs[i] = (ivs[i] & 0b11110) | ((bits >> i) & 1);
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}
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/// <summary>
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/// Hidden Power IV values (even or odd) to achieve a specified Hidden Power Type
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/// </summary>
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/// <remarks>
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/// There are other IV combinations to achieve the same Hidden Power Type.
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/// These are just precomputed for fast modification.
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/// Individual Values (H/A/B/S/C/D)
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/// </remarks>
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public static ReadOnlySpan<byte> DefaultLowBits => new byte[]
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{
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0b000011, // Fighting
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0b001000, // Flying
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0b001011, // Poison
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0b001111, // Ground
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0b010011, // Rock
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0b011001, // Bug
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0b011101, // Ghost
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0b011111, // Steel
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0b100101, // Fire
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0b101001, // Water
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0b101101, // Grass
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0b101111, // Electric
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0b110101, // Psychic
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0b111001, // Ice
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0b111101, // Dragon
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0b111111, // Dark
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};
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}
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