using Yh.Platform.Abstractions;

namespace YhCore.Common.Exceptions
{
    /// <summary>int 错误码 → 新框架 <see cref="IErrorCode"/> 映射（对齐 Java ErrorCode 常量值）。</summary>
    /// <remarks>
    /// 用途：业务直接抛 <see cref="DException"/> 时，把数值错误码转成 IErrorCode：
    /// <code>throw new DException(ErrorCodeUtil.From(5001), "库存不足");</code>
    /// </remarks>
    public static class ErrorCodeUtil
    {
        public const int Default = 1;

        /// <summary>按数值映射平台已知错误码；未知码保留原值（避免业务自定义错误码被吞成 Error=1）。</summary>
        public static IErrorCode From(int code) => code switch
        {
            0 => ErrorCode.Success,
            2 => ErrorCode.ParamError,
            3 => ErrorCode.Forbidden,
            4 => ErrorCode.Unauthorized,
            5 => ErrorCode.Custom,
            6 => ErrorCode.InternalServerError,
            405 => ErrorCode.HttpMethodNotAllowed,
            _ => new RawErrorCode(code, ""),
        };

        /// <summary>未知码透传实现：保留调用方原始 code，msg 由业务消息承载。</summary>
        private sealed record RawErrorCode(int Code, string Msg) : IErrorCode;
    }
}