using AutoMapper;
using MongoDB.Bson;
using ShoppingAssistantApi.Application.Exceptions;
using ShoppingAssistantApi.Application.GlobalInstances;
using ShoppingAssistantApi.Application.IRepositories;
using ShoppingAssistantApi.Application.IServices;
using ShoppingAssistantApi.Application.Models.CreateDtos;
using ShoppingAssistantApi.Application.Models.Dtos;
using ShoppingAssistantApi.Application.Paging;
using ShoppingAssistantApi.Domain.Entities;
using ShoppingAssistantApi.Domain.Enums;

namespace ShoppingAssistantApi.Infrastructure.Services;

public class WishlistsService : IWishlistsService
{
    private readonly IWishlistsRepository _wishlistsRepository;
    private readonly IMessagesRepository _messagesRepository;
    private readonly IMapper _mapper;

    public WishlistsService(IWishlistsRepository wishlistRepository, IMessagesRepository messageRepository, IMapper mapper)
    {
        _wishlistsRepository = wishlistRepository;
        _messagesRepository = messageRepository;
        _mapper = mapper;
    }

    public async Task<WishlistDto> StartPersonalWishlistAsync(WishlistCreateDto dto, CancellationToken cancellationToken)
    {
        var newWishlist = _mapper.Map<Wishlist>(dto);

        newWishlist.CreatedById = (ObjectId) GlobalUser.Id;
        newWishlist.CreatedDateUtc = DateTime.UtcNow;
        newWishlist.Name = $"{newWishlist.Type} Search";

        var createdWishlist = await _wishlistsRepository.AddAsync(newWishlist, cancellationToken);

        var newMessage = new Message
        {
            Text = dto.FirstMessageText,
            Role = MessageRoles.User.ToString(),
            WishlistId = createdWishlist.Id
        };
        var createdMessage = await _messagesRepository.AddAsync(newMessage, cancellationToken);

        return _mapper.Map<WishlistDto>(createdWishlist);
    }

    public async Task<MessageDto> AddMessageToPersonalWishlistAsync(string wishlistId, MessageCreateDto dto, CancellationToken cancellationToken)
    {
        var newMessage = _mapper.Map<Message>(dto);

        if (!ObjectId.TryParse(wishlistId, out var wishlistObjectId))
        {
            throw new InvalidDataException("Provided id is invalid.");
        }
        newMessage.WishlistId = wishlistObjectId;
        newMessage.Role = MessageRoles.User.ToString();
        newMessage.CreatedById = (ObjectId) GlobalUser.Id;
        newMessage.CreatedDateUtc = DateTime.UtcNow;

        var relatedWishlistPage = await _wishlistsRepository.GetPageAsync(1, 1, x => x.Id == wishlistObjectId && x.CreatedById == GlobalUser.Id, cancellationToken);
        var relatedWishlist = relatedWishlistPage.FirstOrDefault();

        if (relatedWishlist == null)
        {
            throw new UnAuthorizedException<Wishlist>();
        }

        var createdMessage = await _messagesRepository.AddAsync(newMessage, cancellationToken);

        return _mapper.Map<MessageDto>(createdMessage);
    }
}