using System.Collections.Generic;
using System.Linq;

namespace PKHeX.Core
{
    /// <summary>
    /// Logic for converting a National Pokédex Species ID to/from generation specific values.
    /// </summary>
    /// <remarks>Generation 4+ always use the national dex ID. Prior generations do not.</remarks>
    internal static class SpeciesConverter
    {
        /// <summary>
        /// Converts Generation 1 species ID to National Dex ID.
        /// </summary>
        /// <param name="raw_id">Generation 1 species ID.</param>
        /// <returns>National Dex ID.</returns>
        public static int GetG1Species(int raw_id) => table1_National[raw_id];

        /// <summary>
        /// Converts a National Dex ID to Generation 1 species ID.
        /// </summary>
        /// <param name="dex_id">National Dex ID.</param>
        /// <returns>Generation 1 species ID.</returns>
        public static int SetG1Species(int dex_id) => table1_Internal[dex_id];

        /// <summary>
        /// Converts a National Dex ID to Generation 3 species ID.
        /// </summary>
        /// <param name="g4index">National Dex ID</param>
        /// <returns>Generation 3 species ID.</returns>
        public static int GetG3Species(int g4index) => Dict3Values.TryGetValue(g4index, out int value) ? value : 0;

        /// <summary>
        /// Converts Generation 3 species ID to National Dex ID.
        /// </summary>
        /// <param name="g3index">Generation 3 species ID.</param>
        /// <returns>National Dex ID.</returns>
        public static int GetG4Species(int g3index) => Dict4Values.TryGetValue(g3index, out int value) ? value : 0;

        private static readonly int[] table1_Internal = { 0x00, 0x99, 0x09, 0x9A, 0xB0, 0xB2, 0xB4, 0xB1, 0xB3, 0x1C, 0x7B, 0x7C, 0x7D, 0x70, 0x71, 0x72, 0x24, 0x96, 0x97, 0xA5, 0xA6, 0x05, 0x23, 0x6C, 0x2D, 0x54, 0x55, 0x60, 0x61, 0x0F, 0xA8, 0x10, 0x03, 0xA7, 0x07, 0x04, 0x8E, 0x52, 0x53, 0x64, 0x65, 0x6B, 0x82, 0xB9, 0xBA, 0xBB, 0x6D, 0x2E, 0x41, 0x77, 0x3B, 0x76, 0x4D, 0x90, 0x2F, 0x80, 0x39, 0x75, 0x21, 0x14, 0x47, 0x6E, 0x6F, 0x94, 0x26, 0x95, 0x6A, 0x29, 0x7E, 0xBC, 0xBD, 0xBE, 0x18, 0x9B, 0xA9, 0x27, 0x31, 0xA3, 0xA4, 0x25, 0x08, 0xAD, 0x36, 0x40, 0x46, 0x74, 0x3A, 0x78, 0x0D, 0x88, 0x17, 0x8B, 0x19, 0x93, 0x0E, 0x22, 0x30, 0x81, 0x4E, 0x8A, 0x06, 0x8D, 0x0C, 0x0A, 0x11, 0x91, 0x2B, 0x2C, 0x0B, 0x37, 0x8F, 0x12, 0x01, 0x28, 0x1E, 0x02, 0x5C, 0x5D, 0x9D, 0x9E, 0x1B, 0x98, 0x2A, 0x1A, 0x48, 0x35, 0x33, 0x1D, 0x3C, 0x85, 0x16, 0x13, 0x4C, 0x66, 0x69, 0x68, 0x67, 0xAA, 0x62, 0x63, 0x5A, 0x5B, 0xAB, 0x84, 0x4A, 0x4B, 0x49, 0x58, 0x59, 0x42, 0x83, 0x15, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
        private static readonly int[] table1_National = { 0x00, 0x70, 0x73, 0x20, 0x23, 0x15, 0x64, 0x22, 0x50, 0x02, 0x67, 0x6C, 0x66, 0x58, 0x5E, 0x1D, 0x1F, 0x68, 0x6F, 0x83, 0x3B, 0x97, 0x82, 0x5A, 0x48, 0x5C, 0x7B, 0x78, 0x09, 0x7F, 0x72, 0x00, 0x00, 0x3A, 0x5F, 0x16, 0x10, 0x4F, 0x40, 0x4B, 0x71, 0x43, 0x7A, 0x6A, 0x6B, 0x18, 0x2F, 0x36, 0x60, 0x4C, 0x00, 0x7E, 0x00, 0x7D, 0x52, 0x6D, 0x00, 0x38, 0x56, 0x32, 0x80, 0x00, 0x00, 0x00, 0x53, 0x30, 0x95, 0x00, 0x00, 0x00, 0x54, 0x3C, 0x7C, 0x92, 0x90, 0x91, 0x84, 0x34, 0x62, 0x00, 0x00, 0x00, 0x25, 0x26, 0x19, 0x1A, 0x00, 0x00, 0x93, 0x94, 0x8C, 0x8D, 0x74, 0x75, 0x00, 0x00, 0x1B, 0x1C, 0x8A, 0x8B, 0x27, 0x28, 0x85, 0x88, 0x87, 0x86, 0x42, 0x29, 0x17, 0x2E, 0x3D, 0x3E, 0x0D, 0x0E, 0x0F, 0x00, 0x55, 0x39, 0x33, 0x31, 0x57, 0x00, 0x00, 0x0A, 0x0B, 0x0C, 0x44, 0x00, 0x37, 0x61, 0x2A, 0x96, 0x8F, 0x81, 0x00, 0x00, 0x59, 0x00, 0x63, 0x5B, 0x00, 0x65, 0x24, 0x6E, 0x35, 0x69, 0x00, 0x5D, 0x3F, 0x41, 0x11, 0x12, 0x79, 0x01, 0x03, 0x49, 0x00, 0x76, 0x77, 0x00, 0x00, 0x00, 0x00, 0x4D, 0x4E, 0x13, 0x14, 0x21, 0x1E, 0x4A, 0x89, 0x8E, 0x00, 0x51, 0x00, 0x00, 0x04, 0x07, 0x05, 0x08, 0x06, 0x00, 0x00, 0x00, 0x00, 0x2B, 0x2C, 0x2D, 0x45, 0x46, 0x47, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };

        /// <summary>
        /// Gen3 Species IDs ordered by National Dex ID
        /// </summary>
        private static readonly int[] oldIndex =
        {
            000, 001, 002, 003, 004, 005, 006, 007, 008, 009, 010, 011, 012, 013, 014, 015, 016, 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, 043, 044, 045, 046, 047, 048, 049, 050, 051, 052, 053, 054, 055, 056, 057, 058, 059,
            060, 061, 062, 063, 064, 065, 066, 067, 068, 069, 070, 071, 072, 073, 074, 075, 076, 077, 078, 079,
            080, 081, 082, 083, 084, 085, 086, 087, 088, 089, 090, 091, 092, 093, 094, 095, 096, 097, 098, 099,
            100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119,
            120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139,
            140, 141, 142, 143, 144, 145, 146, 147, 148, 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, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199,
            200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 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, 277, 278, 279, 280, 281, 282, 283, 284,
            285, 286, 287, 288, 289, 290, 291, 292, 293, 294, 295, 296, 297, 298, 299, 300, 304, 305, 309, 310,
            392, 393, 394, 311, 312, 306, 307, 364, 365, 366, 301, 302, 303, 370, 371, 372, 335, 336, 350, 320,
            315, 316, 322, 355, 382, 383, 384, 356, 357, 337, 338, 353, 354, 386, 387, 363, 367, 368, 330, 331,
            313, 314, 339, 340, 321, 351, 352, 308, 332, 333, 334, 344, 345, 358, 359, 380, 379, 348, 349, 323,
            324, 326, 327, 318, 319, 388, 389, 390, 391, 328, 329, 385, 317, 377, 378, 361, 362, 369, 411, 376,
            360, 346, 347, 341, 342, 343, 373, 374, 375, 381, 325, 395, 396, 397, 398, 399, 400, 401, 402, 403,
            407, 408, 404, 405, 406, 409, 410
        };
        private static readonly Dictionary<int, int> Dict3Values = oldIndex.Select((v, i) => new { Key = i, Value = v })
            .ToDictionary(o => o.Key, o => o.Value);
        private static readonly Dictionary<int, int> Dict4Values = oldIndex.Select((v, i) => new { Key = v, Value = i })
            .ToDictionary(o => o.Key, o => o.Value);
    }
}