using CleanArchitecture.Application.Common.Interfaces;
using CleanArchitecture.Domain.Entities;
using MediatR;
using System.Threading;
using System.Threading.Tasks;
using CleanArchitecture.Domain.Common;
using CleanArchitecture.WebUI.Controllers;
using FluentValidation;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;

namespace CleanArchitecture.Application.TodoItems.Commands.CreateTodoItem
{
    [Authorize]
    public class CreateTodoItemController : ApiControllerBase
    {
        [HttpPost("/todoItems")]
        public async Task<ActionResult<int>> Create(CreateTodoItemCommand command)
        {
            return await Mediator.Send(command);
        }
    }

    public class CreateTodoItemCommand : IRequest<int>
    {
        public int ListId { get; set; }

        public string Title { get; set; }
    }

    public class CreateTodoItemCommandValidator : AbstractValidator<CreateTodoItemCommand>
    {
        public CreateTodoItemCommandValidator()
        {
            RuleFor(v => v.Title)
                .MaximumLength(200)
                .NotEmpty();
        }
    }

    public class CreateTodoItemCommandHandler : IRequestHandler<CreateTodoItemCommand, int>
    {
        private readonly IApplicationDbContext _context;

        public CreateTodoItemCommandHandler(IApplicationDbContext context)
        {
            _context = context;
        }

        public async Task<int> Handle(CreateTodoItemCommand request, CancellationToken cancellationToken)
        {
            var entity = new TodoItem
            {
                ListId = request.ListId,
                Title = request.Title,
                Done = false
            };

            entity.DomainEvents.Add(new TodoItemCreatedEvent(entity));

            _context.TodoItems.Add(entity);

            await _context.SaveChangesAsync(cancellationToken);

            return entity.Id;
        }
    }

    public class TodoItemCreatedEvent : DomainEvent
    {
        public TodoItemCreatedEvent(TodoItem item)
        {
            Item = item;
        }

        public TodoItem Item { get; }
    }
}