mirror of
https://github.com/kwsch/PKHeX
synced 2024-11-26 22:10:21 +00:00
95fbf66a6e
In addition to the Method 1 (and other sibling PIDIV types) correlation, an encounter can only be triggered if the calls prior land on the Method {1} seed. The RNG community has dubbed these patterns as "Method J" (D/P/Pt), "Method K" (HG/SS), and "Method H" (Gen3, coined by yours truly). The basic gist of these is that they are pre-requisites, like the Shadow locks of Colosseum/XD.
Rename/re-type a bunch of properties to get the codebase more in line with correct property names & more obvious underlying types.
222 lines
9.2 KiB
C#
222 lines
9.2 KiB
C#
using System;
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namespace PKHeX.Core;
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/// <summary>
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/// Logic for converting Item IDs between the generation specific value sets.
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/// </summary>
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public static class ItemConverter
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{
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/// <summary>Unused item ID, placeholder for item/sprite finding in Generations 2-4.</summary>
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private const ushort NaN = 128;
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/// <summary>
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/// Checks if the item can be kept during 3->4 conversion.
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/// </summary>
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/// <param name="item">Generation 3 Item ID.</param>
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/// <returns>True if transferable, False if not transferable.</returns>
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public static bool IsItemTransferable34(ushort item) => item != NaN && item > 0;
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/// <summary>
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/// Converts a Generation 3 Item ID to Generation 4+ Item ID.
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/// </summary>
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/// <param name="item">Generation 3 Item ID.</param>
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/// <returns>Generation 4+ Item ID.</returns>
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public static ushort GetItemFuture3(ushort item) => item > Item3to4.Length ? NaN : Item3to4[item];
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/// <summary>
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/// Converts a Generation 2 Item ID to Generation 4+ Item ID.
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/// </summary>
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/// <param name="item">Generation 2 Item ID.</param>
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/// <returns>Generation 4+ Item ID.</returns>
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public static ushort GetItemFuture2(byte item) => item > Item2to4.Length ? NaN : Item2to4[item];
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/// <summary>
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/// Converts a Generation 4+ Item ID to Generation 3 Item ID.
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/// </summary>
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/// <param name="item">Generation 4+ Item ID.</param>
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/// <returns>Generation 3 Item ID.</returns>
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public static ushort GetItemOld3(ushort item)
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{
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if (item == NaN)
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return 0;
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int index = Item3to4.IndexOf(item);
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if (index == -1)
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return 0;
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return (ushort)index;
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}
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/// <summary>
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/// Converts a Generation 4+ Item ID to Generation 2 Item ID.
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/// </summary>
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/// <param name="item">Generation 4+ Item ID.</param>
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/// <returns>Generation 2 Item ID.</returns>
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public static byte GetItemOld2(ushort item)
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{
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if (item == NaN)
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return 0;
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int index = Item2to4.IndexOf(item);
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if (index == -1)
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return 0;
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return (byte)index;
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}
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#region Item Mapping Tables
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/// <summary> Gen2 items (index) and their corresponding Gen4 item ID (value) </summary>
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private static ReadOnlySpan<ushort> Item2to4 =>
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[
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000, 001, 002, 213, 003, 004, NaN, 450, 081, 018, // 0
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019, 020, 021, 022, 023, 024, 025, 026, 017, 078, // 1
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079, 041, 082, 083, 084, NaN, 045, 046, 047, 048, // 2
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256, 049, 050, 060, 085, 257, 092, 063, 027, 028, // 3
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029, 055, 076, 077, 056, NaN, 030, 031, 032, 057, // 4
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NaN, 058, 059, 061, 444, NaN, NaN, 216, 445, 446, // 5
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NaN, 447, 051, 038, 039, 040, 478, 464, 456, 484, // 6
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NaN, 482, 033, 217, 151, NaN, 237, 244, 149, 153, // 7
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152, 245, 221, 156, 150, 485, 086, 087, 222, 487, // 8
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NaN, 223, 486, 488, 224, 243, 248, 490, 241, 491, // 9
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NaN, 489, 240, 473, NaN, 259, 228, 246, 242, 157, // 10
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088, 089, 229, 247, 504, NaN, NaN, 239, 258, 230, // 11
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NaN, 034, 035, 036, 037, 238, 231, 475, 481, NaN, // 12
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NaN, 090, 091, 476, 480, NaN, NaN, NaN, 249, 043, // 13
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232, NaN, NaN, 233, 250, NaN, 234, NaN, NaN, NaN, // 14
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154, 235, NaN, NaN, NaN, NaN, 044, 495, NaN, 493, // 15
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NaN, 492, NaN, 236, 497, 498, 496, NaN, NaN, 080, // 16
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NaN, NaN, 252, 155, 158, 477, NaN, 500, 483, NaN, // 17
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NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, // 18
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NaN, 328, 329, 330, 331, 331, 332, 333, 334, 335, // 19
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336, 337, 338, 339, 340, 341, 342, 343, 344, 345, // 20
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346, 347, 348, 349, 350, 351, 352, 353, 354, 355, // 21
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355, 356, 357, 358, 359, 360, 361, 362, 363, 364, // 22
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365, 366, 367, 368, 369, 370, 371, 372, 373, 374, // 23
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375, 376, 377, 420, 421, 422, 423, 424, 425, 426, // 24
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427, NaN, NaN, NaN, NaN, NaN,
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];
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/// <summary> Gen3 items (index) and their corresponding Gen4 item ID (value) </summary>
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private static ReadOnlySpan<ushort> Item3to4 =>
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[
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000, 001, 002, 003, 004, 005, 006, 007, 008, 009,
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010, 011, 012, 017, 018, 019, 020, 021, 022, 023,
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024, 025, 026, 027, 028, 029, 030, 031, 032, 033,
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034, 035, 036, 037, 038, 039, 040, 041, 042, 065,
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066, 067, 068, 069, 043, 044, 070, 071, 072, 073,
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074, 075, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN,
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NaN, NaN, NaN, 045, 046, 047, 048, 049, 050, 051,
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052, 053, NaN, 055, 056, 057, 058, 059, 060, 061,
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063, 064, NaN, 076, 077, 078, 079, NaN, NaN, NaN,
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NaN, NaN, NaN, 080, 081, 082, 083, 084, 085, NaN,
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NaN, NaN, NaN, 086, 087, NaN, 088, 089, 090, 091,
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092, 093, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN,
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NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN,
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NaN, NaN, NaN, 149, 150, 151, 152, 153, 154, 155,
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156, 157, 158, 159, 160, 161, 162, 163, 164, 165,
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166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
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176, 177, 178, 179, 180, 181, 182, 183, 201, 202,
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203, 204, 205, 206, 207, 208, NaN, NaN, NaN, 213,
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214, 215, 216, 217, 218, 219, 220, 221, 222, 223,
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224, 225, 226, 227, 228, 229, 230, 231, 232, 233,
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234, 235, 236, 237, 238, 239, 240, 241, 242, 243,
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244, 245, 246, 247, 248, 249, 250, 251, 252, 253,
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254, 255, 256, 257, 258, 259, NaN, NaN, NaN, NaN,
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NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN,
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NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN,
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NaN, NaN, NaN, NaN, 260, 261, 262, 263, 264,
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NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN,
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NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN,
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NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN,
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328, 329, 330, 331, 332, 333, 334, 335, 336, 337,
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338, 339, 340, 341, 342, 343, 344, 345, 346, 347,
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348, 349, 350, 351, 352, 353, 354, 355, 356, 357,
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358, 359, 360, 361, 362, 363, 364, 365, 366, 367,
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368, 369, 370, 371, 372, 373, 374, 375, 376, 377,
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];
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#endregion
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/// <summary>
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/// Converts a Generation 1 (Teru-sama) Item ID to Generation 2 Item ID.
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/// </summary>
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/// <param name="value">Gen1 Item ID</param>
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/// <returns>Gen2 Item ID</returns>
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/// <remarks>
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/// <br>https://github.com/pret/pokecrystal/blob/edb624c20ceb50eef9d73a5df0ac041cc156dd32/engine/link/link.asm#L1093-L1115</br>
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/// <br>https://github.com/pret/pokecrystal/blob/edb624c20ceb50eef9d73a5df0ac041cc156dd32/data/items/catch_rate_items.asm#L5-L17</br>
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/// </remarks>
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private static byte GetTeruSamaItem(byte value) => value switch
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{
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0x19 => 0x92, // Leftovers
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0x2D => 0x53, // Bitter Berry
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0x32 => 0xAE, // Gold Berry
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0x5A or 0x64 or 0x78 or 0x87 or 0xBE or 0xC3 or 0xDC or 0xFA or 0xFF => 0xAD, // Berry
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_ => value,
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};
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/// <summary>
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/// Converts a Gen1 <see cref="PK1.CatchRate"/> value to Gen2 Item.
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/// </summary>
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/// <param name="value">Gen1 Item</param>
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/// <returns>Gen2 Item</returns>
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public static byte GetItemFuture1(byte value)
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{
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if (!IsItemTransferable12(value))
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return GetTeruSamaItem(value);
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return value;
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}
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private static bool IsItemTransferable12(ushort item) => Legal.HeldItems_GSC.AsSpan().Contains(item);
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/// <summary>
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/// Gets a format specific <see cref="PKM.HeldItem"/> value depending on the desired format and the provided item index & origin format.
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/// </summary>
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/// <param name="srcItem">Held Item to apply</param>
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/// <param name="srcFormat">Format from importing</param>
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/// <param name="destFormat">Format required for holder</param>
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/// <returns>destItem</returns>
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public static int GetItemForFormat(int srcItem, EntityContext srcFormat, EntityContext destFormat)
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{
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if (srcItem <= 0)
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return 0;
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if (destFormat == srcFormat)
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return srcItem;
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if (destFormat != srcFormat && srcFormat <= EntityContext.Gen3) // past gen items
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{
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if (destFormat > EntityContext.Gen3) // try remapping
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return srcFormat == EntityContext.Gen2 ? GetItemFuture2((byte)srcItem) : GetItemFuture3((ushort)srcItem);
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if (destFormat > srcFormat) // can't set past gen items
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return 0;
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// ShowdownSet checks Gen3 then Gen2.
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// For Gen2 collisions (if any?) remap 3->4->2.
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srcItem = GetItemFuture3((ushort)srcItem);
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srcItem = GetItemOld2((ushort)srcItem);
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if (srcItem <= 0)
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return 0;
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}
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return destFormat switch
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{
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EntityContext.Gen1 => 0,
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EntityContext.Gen2 => (byte) srcItem,
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EntityContext.Gen3 => GetItemOld3((ushort) srcItem),
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_ => srcItem,
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};
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}
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/// <summary>
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/// Checks if an item ID is an HM
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/// </summary>
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/// <param name="item">Item ID</param>
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/// <param name="generation">Generation the <see cref="item"/> exists in</param>
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/// <returns>True if is an HM</returns>
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public static bool IsItemHM(ushort item, byte generation) => generation switch
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{
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1 => item is (>= 196 and <= 200),
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2 => item is (>= 243 and <= 249),
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3 => item is (>= 339 and <= 346),
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_ => item is (>= 420 and <= 427) or 737,
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};
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}
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