using AutoMapper;
using AutoMapper.Internal.Mappers;
using Entities.Contracts;
using Entities.DTO;

namespace TechHelper.Context
{
	public class AutoMapperProFile : Profile
	{

		public static class EnumMappingHelpers
		{
			public static TEnum ParseEnumSafe<TEnum>(string sourceString, TEnum defaultValue) where TEnum : struct, Enum
			{
				if (Enum.TryParse(sourceString, true, out TEnum parsedValue))
				{
					return parsedValue;
				}
				return defaultValue;
			}
		}

		public AutoMapperProFile()
		{
			CreateMap<UserForRegistrationDto, User>()
				.ForMember(dest => dest.Id, opt => opt.Ignore())                                    // ID由IdentityUser生成
				.ForMember(dest => dest.UserName, opt => opt.MapFrom(src => src.Name))              // 或者 MapFrom(src => src.Name)
				.ForMember(dest => dest.Email, opt => opt.MapFrom(src => src.Email))
				.ForMember(dest => dest.PhoneNumber, opt => opt.MapFrom(src => src.PhoneNumber))
				.ForMember(dest => dest.Address, opt => opt.MapFrom(src => src.HomeAddress))        // 映射到 IdentityUser 的 Address 属性
				.ForMember(dest => dest.PasswordHash, opt => opt.Ignore())                          // 密码哈希由 UserManager 处理
				.ForMember(dest => dest.EmailConfirmed, opt => opt.Ignore());                       // 邮箱确认状态由服务层处理

			CreateMap<ClassDto, Class>()
				.ForMember(d => d.Number, o => o.MapFrom(src => src.Class)).ReverseMap();

			CreateMap<SubQuestionDto, Question>()
				 .ForMember(dest => dest.Id, opt => opt.Ignore())
				 .ForMember(dest => dest.Title, opt => opt.MapFrom(src => src.Stem))
				 .ForMember(dest => dest.Answer, opt => opt.MapFrom(src => src.SampleAnswer))
				 .ForMember(dest => dest.Type, opt => opt.MapFrom(src => EnumMappingHelpers.ParseEnumSafe(src.QuestionType, QuestionType.Unknown)))
				 .ForMember(dest => dest.DifficultyLevel, opt => opt.MapFrom(src => EnumMappingHelpers.ParseEnumSafe(src.DifficultyLevel, DifficultyLevel.easy)))
				 .ForMember(dest => dest.SubjectArea, opt => opt.MapFrom(src => EnumMappingHelpers.ParseEnumSafe(src.DifficultyLevel, SubjectAreaEnum.Unknown)))
				 .ForMember(dest => dest.CreatorId, opt => opt.Ignore())
				 .ForMember(dest => dest.CreatedAt, opt => opt.Ignore())
				 .ForMember(dest => dest.UpdatedAt, opt => opt.Ignore())
				 .ForMember(dest => dest.IsDeleted, opt => opt.Ignore());


			// =============================================================
			// ENTITY -> DTO Mappings (用于读取/查询)
			// =============================================================
			CreateMap<Assignment, AssignmentDto>()
				.ForMember(dest => dest.ExamStruct, opt => opt.MapFrom(src => src.ExamStruct));

			CreateMap<AssignmentStruct, AssignmentStructDto>(); // 直接映射，因为成员现在对等了

			// 新增！从实体到新的 DTO 的映射
			CreateMap<AssignmentQuestion, AssignmentQuestionDto>();

			CreateMap<Question, QuestionDto>();

			// =================================================================
			// DTO -> ENTITY Mappings (用于创建/更新) - 现在变得极其简单！
			// =================================================================
			CreateMap<AssignmentDto, Assignment>();
			CreateMap<AssignmentStructDto, AssignmentStruct>();

			// 新增！从新的 DTO 到实体的映射
			CreateMap<AssignmentQuestionDto, AssignmentQuestion>();

			CreateMap<QuestionDto, Question>();

		}
	}

}