#nullable enable
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.CompilerServices;

namespace HumanoidRetargeterZstd.Unsafe
{
    public static unsafe partial class Methods
    {
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        private static bool ERR_isError(nuint code)
        {
            return code > unchecked((nuint)(-(int)ZSTD_ErrorCode.ZSTD_error_maxCode));
        }

        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        private static ZSTD_ErrorCode ERR_getErrorCode(nuint code)
        {
            if (!ERR_isError(code))
                return 0;
            return (ZSTD_ErrorCode)(0 - code);
        }

        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        private static string ERR_getErrorName(nuint code)
        {
            return ERR_getErrorString(ERR_getErrorCode(code));
        }

        /*-****************************************
         *  Error Strings
         ******************************************/
        private static string ERR_getErrorString(ZSTD_ErrorCode code)
        {
            const string notErrorCode = "Unspecified error code";
            switch (code)
            {
                case ZSTD_ErrorCode.ZSTD_error_no_error:
                    return "No error detected";
                case ZSTD_ErrorCode.ZSTD_error_GENERIC:
                    return "Error (generic)";
                case ZSTD_ErrorCode.ZSTD_error_prefix_unknown:
                    return "Unknown frame descriptor";
                case ZSTD_ErrorCode.ZSTD_error_version_unsupported:
                    return "Version not supported";
                case ZSTD_ErrorCode.ZSTD_error_frameParameter_unsupported:
                    return "Unsupported frame parameter";
                case ZSTD_ErrorCode.ZSTD_error_frameParameter_windowTooLarge:
                    return "Frame requires too much memory for decoding";
                case ZSTD_ErrorCode.ZSTD_error_corruption_detected:
                    return "Data corruption detected";
                case ZSTD_ErrorCode.ZSTD_error_checksum_wrong:
                    return "Restored data doesn't match checksum";
                case ZSTD_ErrorCode.ZSTD_error_literals_headerWrong:
                    return "Header of Literals' block doesn't respect format specification";
                case ZSTD_ErrorCode.ZSTD_error_parameter_unsupported:
                    return "Unsupported parameter";
                case ZSTD_ErrorCode.ZSTD_error_parameter_combination_unsupported:
                    return "Unsupported combination of parameters";
                case ZSTD_ErrorCode.ZSTD_error_parameter_outOfBound:
                    return "Parameter is out of bound";
                case ZSTD_ErrorCode.ZSTD_error_init_missing:
                    return "Context should be init first";
                case ZSTD_ErrorCode.ZSTD_error_memory_allocation:
                    return "Allocation error : not enough memory";
                case ZSTD_ErrorCode.ZSTD_error_workSpace_tooSmall:
                    return "workSpace buffer is not large enough";
                case ZSTD_ErrorCode.ZSTD_error_stage_wrong:
                    return "Operation not authorized at current processing stage";
                case ZSTD_ErrorCode.ZSTD_error_tableLog_tooLarge:
                    return "tableLog requires too much memory : unsupported";
                case ZSTD_ErrorCode.ZSTD_error_maxSymbolValue_tooLarge:
                    return "Unsupported max Symbol Value : too large";
                case ZSTD_ErrorCode.ZSTD_error_maxSymbolValue_tooSmall:
                    return "Specified maxSymbolValue is too small";
                case ZSTD_ErrorCode.ZSTD_error_cannotProduce_uncompressedBlock:
                    return "This mode cannot generate an uncompressed block";
                case ZSTD_ErrorCode.ZSTD_error_stabilityCondition_notRespected:
                    return "pledged buffer stability condition is not respected";
                case ZSTD_ErrorCode.ZSTD_error_dictionary_corrupted:
                    return "Dictionary is corrupted";
                case ZSTD_ErrorCode.ZSTD_error_dictionary_wrong:
                    return "Dictionary mismatch";
                case ZSTD_ErrorCode.ZSTD_error_dictionaryCreation_failed:
                    return "Cannot create Dictionary from provided samples";
                case ZSTD_ErrorCode.ZSTD_error_dstSize_tooSmall:
                    return "Destination buffer is too small";
                case ZSTD_ErrorCode.ZSTD_error_srcSize_wrong:
                    return "Src size is incorrect";
                case ZSTD_ErrorCode.ZSTD_error_dstBuffer_null:
                    return "Operation on NULL destination buffer";
                case ZSTD_ErrorCode.ZSTD_error_noForwardProgress_destFull:
                    return "Operation made no progress over multiple calls, due to output buffer being full";
                case ZSTD_ErrorCode.ZSTD_error_noForwardProgress_inputEmpty:
                    return "Operation made no progress over multiple calls, due to input being empty";
                case ZSTD_ErrorCode.ZSTD_error_frameIndex_tooLarge:
                    return "Frame index is too large";
                case ZSTD_ErrorCode.ZSTD_error_seekableIO:
                    return "An I/O error occurred when reading/seeking";
                case ZSTD_ErrorCode.ZSTD_error_dstBuffer_wrong:
                    return "Destination buffer is wrong";
                case ZSTD_ErrorCode.ZSTD_error_srcBuffer_wrong:
                    return "Source buffer is wrong";
                case ZSTD_ErrorCode.ZSTD_error_sequenceProducer_failed:
                    return "Block-level external sequence producer returned an error code";
                case ZSTD_ErrorCode.ZSTD_error_externalSequences_invalid:
                    return "External sequences are not valid";
                case ZSTD_ErrorCode.ZSTD_error_maxCode:
                default:
                    return notErrorCode;
            }
        }
    }
}