using System; using System.Collections.Generic; namespace PKHeX.Core { /// /// Logic for converting Item IDs between the generation specific value sets. /// internal static class ItemConverter { /// Unused item ID, placeholder for item/sprite finding private const ushort NaN = 128; /// /// Checks if the item can be kept during 3->4 conversion. /// /// Generation 3 Item ID. /// True if transferrable, False if not transferrable. public static bool IsItemTransferrable34(ushort item) => item != NaN && item > 0; /// /// Converts a Generation 3 Item ID to Generation 4+ Item ID. /// /// Generation 3 Item ID. /// Generation 4+ Item ID. public static ushort GetG4Item(ushort g3val) => g3val > arr3.Length ? NaN : arr3[g3val]; /// /// Converts a Generation 2 Item ID to Generation 4+ Item ID. /// /// Generation 2 Item ID. /// Generation 4+ Item ID. public static ushort GetG4Item(byte g2val) => g2val > arr2.Length ? NaN : arr2[g2val]; /// /// Converts a Generation 4+ Item ID to Generation 3 Item ID. /// /// Generation 4+ Item ID. /// Generation 3 Item ID. public static ushort GetG3Item(ushort g4val) { if (g4val == NaN) return 0; int index = Array.IndexOf(arr3, g4val); return (ushort)Math.Max(0, index); } /// /// Converts a Generation 4+ Item ID to Generation 2 Item ID. /// /// Generation 4+ Item ID. /// Generation 2 Item ID. public static byte GetG2Item(ushort g4val) { if (g4val == NaN) return 0; int index = Array.IndexOf(arr2, g4val); return (byte)Math.Max(0, index); } #region Item Mapping Tables /// Gen2 items (index) and their corresponding Gen4 item ID (value) private static readonly ushort[] arr2 = { 000, 001, 002, 213, 003, 004, NaN, 450, 081, 018, // 0 019, 020, 021, 022, 023, 024, 025, 026, 017, 078, // 1 079, 041, 082, 083, 084, NaN, 045, 046, 047, 048, // 2 256, 049, 050, 060, 085, 257, 092, 063, 027, 028, // 3 029, 055, 076, 077, 056, NaN, 030, 031, 032, 057, // 4 NaN, 058, 059, 061, 444, NaN, NaN, 216, 445, 446, // 5 NaN, 447, 051, 038, 039, 040, 478, 464, 456, 484, // 6 NaN, 482, 033, 217, 151, NaN, 237, 244, 149, 153, // 7 152, 245, 221, 156, 150, 485, 086, 087, 222, 487, // 8 NaN, 223, 486, 488, 224, 243, 248, 490, 241, 491, // 9 NaN, 489, 240, 473, NaN, 259, 228, 246, 242, 157, // 10 088, 089, 229, 247, 504, NaN, NaN, 239, 258, 230, // 11 NaN, 034, 035, 036, 037, 238, 231, 475, 481, NaN, // 12 NaN, 090, 091, 476, 480, NaN, NaN, NaN, 249, 043, // 13 232, NaN, NaN, 233, 250, NaN, 234, NaN, NaN, NaN, // 14 154, 235, NaN, NaN, NaN, NaN, 044, 495, NaN, 493, // 15 NaN, 492, NaN, 236, 497, 498, 496, NaN, NaN, 080, // 16 NaN, NaN, 252, 155, 158, 477, NaN, 500, 483, NaN, // 17 NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, // 18 NaN, 328, 329, 330, 331, 331, 332, 333, 334, 335, // 19 336, 337, 338, 339, 340, 341, 342, 343, 344, 345, // 20 346, 347, 348, 349, 350, 351, 352, 353, 354, 355, // 21 355, 356, 357, 358, 359, 360, 361, 362, 363, 364, // 22 365, 366, 367, 368, 369, 370, 371, 372, 373, 374, // 23 375, 376, 377, 420, 421, 422, 423, 424, 425, 426, // 24 427, NaN, NaN, NaN, NaN, NaN, }; /// Gen3 items (index) and their corresponding Gen4 item ID (value) private static readonly ushort[] arr3 = { 000, 001, 002, 003, 004, 005, 006, 007, 008, 009, 010, 011, 012, 017, 018, 019, 020, 021, 022, 023, 024, 025, 026, 027, 028, 029, 030, 031, 032, 033, 034, 035, 036, 037, 038, 039, 040, 041, 042, 065, 066, 067, 068, 069, 043, 044, 070, 071, 072, 073, 074, 075, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, 045, 046, 047, 048, 049, 050, 051, 052, 053, NaN, 055, 056, 057, 058, 059, 060, 061, 063, 064, NaN, 076, 077, 078, 079, NaN, NaN, NaN, NaN, NaN, NaN, 080, 081, 082, 083, 084, 085, NaN, NaN, NaN, NaN, 086, 087, NaN, 088, 089, 090, 091, 092, 093, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 201, 202, 203, 204, 205, 206, 207, 208, NaN, NaN, NaN, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255, 256, 257, 258, 259, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, 260, 261, 262, 263, 264, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, 328, 329, 330, 331, 332, 333, 334, 335, 336, 337, 338, 339, 340, 341, 342, 343, 344, 345, 346, 347, 348, 349, 350, 351, 352, 353, 354, 355, 356, 357, 358, 359, 360, 361, 362, 363, 364, 365, 366, 367, 368, 369, 370, 371, 372, 373, 374, 375, 376, 377, }; #endregion /// /// Converts a Generation 1 (Teru-sama) Item ID to Generation 2 Item ID. /// /// Gen1 Item ID /// Gen2 Item ID /// https://github.com/pret/pokecrystal/blob/edb624c20ceb50eef9d73a5df0ac041cc156dd32/engine/link/link.asm#L1093-L1115 private static int GetTeruSamaItem(int g1val) { switch (g1val) { case 0x19: return 0x92; // Leftovers case 0x2D: return 0x53; // Bitter Berry case 0x32: return 0xAE; // Leftovers case 0x5A: case 0x64: case 0x78: case 0x87: case 0xBE: case 0xC3: case 0xDC: case 0xFA: case 0xFF: return 0xAD; // Berry default: return g1val; } } public static int GetG2ItemTransfer(int g1val) { if (!IsItemTransferrable12((ushort) g1val)) return GetTeruSamaItem(g1val); return g1val; } public static bool IsItemTransferrable12(ushort item) => ((IList) Legal.HeldItems_GSC).Contains(item); /// /// Gets a format specific value depending on the desired format and the provided item index & origin format. /// /// Held Item to apply /// Format from importing /// Format required for holder public static int GetFormatHeldItemID(int item, int srcFormat, int destFormat) { if (item <= 0) return 0; if (destFormat != srcFormat && srcFormat <= 3) // past gen items { if (destFormat > 3) // try remapping return srcFormat == 2 ? GetG4Item((byte)item) : GetG4Item((ushort)item); if (destFormat > srcFormat) // can't set past gen items return 0; // ShowdownSet checks gen3 then gen2. For gen2 collisions (if any?) remap 3->4->2. item = GetG4Item((ushort)item); item = GetG2Item((ushort)item); if (item <= 0) return 0; } switch (destFormat) { case 3: return GetG3Item((ushort)item); case 2: return (byte)item; case 1: return 0; default: return item; } } } }