using AutoMapper;
using Contracts;
using Entities;
using Entities.Exceptions;
using Microsoft.AspNetCore.Mvc;
using Service.Contracts;
using Shared.DataTransferObjects;

namespace Service;

public class LikeService : ILikeService
{
    private readonly IRepositoryManager _repository;
    private readonly IMapper _mapper;

    public LikeService(IRepositoryManager repository, IMapper mapper)
    {
        _repository = repository;
        _mapper = mapper;
    }
    public async Task<IEnumerable<LikeDto>> GetLikesAsync(Guid entityId, string entityType, bool trackChanges)
    {
        var likes = await _repository.Like.GetLikesAsync(entityId, entityType, trackChanges);
        var likesDto = _mapper.Map<IEnumerable<LikeDto>>(likes);
        return likesDto;
    }

    public async Task<LikeDto> GetLikeByIdAsync(Guid likeId, bool trackChanges)
    {
        var like = await _repository.Like.GetLikeByIdAsync(likeId, trackChanges);
        var likeDto = _mapper.Map<LikeDto>(like);
        return likeDto;
    }

    public async Task<LikeDto> CreateLikeAsync(string userId, string displayName, LikeForCreationDto likeForCreation)
    {
        var likeEntity = _mapper.Map<Like>(likeForCreation);
        _repository.Like.CreateLike(userId, displayName, likeEntity);
        await _repository.SaveAsync();

        var likeDto = _mapper.Map<LikeDto>(likeEntity);
        return likeDto;
    }

    public async Task DeleteLikeAsync(Guid likeId, bool trackChanges)
    {

        var likeEntity = await _repository.Like.GetLikeByIdAsync(likeId, trackChanges);


        _repository.Like.DeleteLike(likeEntity);
        await _repository.SaveAsync();
    }

    public async Task DeleteLikeAndUpdatePostAsync(Guid likeId)
    {
        var like = await _repository.Like.GetLikeByIdAsync(likeId, trackChanges: true);
        if (like == null)
        {
            throw new LikeNotFoundException(likeId);
        }

        if (like.PostId.HasValue)
        {
            var post = await _repository.Post.GetPostByIdAsync(like.PostId.Value, trackChanges: true);
            if (post != null)
            {
                post.LikeCount--;
                await _repository.SaveAsync();
            }
        }

        _repository.Like.DeleteLike(like);
        await _repository.SaveAsync();
    }

}