using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using MQTTnet;
using MQTTnet.Client;
using MQTTnet.Server;
using MyCore.Interfaces.Models;
using MyCore.Service.Services;
using MyCore.Services;
using MyCore.Interfaces.DTO;


namespace MyCore.Controllers
{
    [Authorize] // TODO Add ROLES (Roles = "Admin")
    [Route("api/user")]
    [ApiController]
    public class UserController : ControllerBase
    {
        private UserDatabaseService _userService;
        private TokensService _tokenService;

        public UserController(UserDatabaseService userService, TokensService tokenService)
        {
            _userService = userService;
            _tokenService = tokenService;
        }

        /// <summary>
        /// Get a list of user 
        /// </summary>
        [ProducesResponseType(typeof(List<UserInfo>), 200)]
        [ProducesResponseType(typeof(string), 500)]
        [HttpGet]
        public ObjectResult Get()
        {
            try
            {
                List<UserInfo> users = _userService.GetAll();

                return new OkObjectResult(users);
            }
            catch (Exception ex)
            {
                return new ObjectResult(ex.Message) { StatusCode = 500 };
            }
        }

        
        /// <summary>
        /// Get a specific user 
        /// </summary>
        /// <param name="id">id user</param>  
        [ProducesResponseType(typeof(UserInfoDetailDTO), 200)]
        [ProducesResponseType(typeof(string), 404)]
        [ProducesResponseType(typeof(string), 500)]
        [HttpGet("{id}")]
        public ObjectResult Get(string id)
        {
            try
            {
                UserInfo user = _userService.GetById(id);

                if (user == null)
                    throw new KeyNotFoundException("This user was not found");

                return new OkObjectResult(user.ToDTO());
            }
            catch (KeyNotFoundException ex)
            {
                return new NotFoundObjectResult(ex.Message) {};
            }
            catch (Exception ex)
            {
                return new ObjectResult(ex.Message) { StatusCode = 500 };
            }
        }

        /// <summary>
        /// Create an user
        /// </summary>
        /// <param name="newUser">New user info</param>  
        [AllowAnonymous]
        [ProducesResponseType(typeof(UserInfoDetailDTO), 200)]
        [ProducesResponseType(typeof(string), 400)]
        [ProducesResponseType(typeof(string), 409)]
        [ProducesResponseType(typeof(string), 500)]
        [HttpPost]
        public ObjectResult CreateUser([FromBody] UserInfo newUser)
        {
            try
            {
                if (newUser == null)
                    throw new ArgumentNullException("User param is null");

                newUser.Token = _tokenService.GenerateToken(newUser.Email).ToString();
                newUser.DateCreation = DateTime.Now;

                List<UserInfo> users = _userService.GetAll();

                if (users.Select(u => u.Email).Contains(newUser.Email))
                    throw new InvalidOperationException("This Email is already used");

                UserInfo userCreated = _userService.Create(newUser);

                return new OkObjectResult(userCreated.ToDTO());
            }
            catch (ArgumentNullException ex)
            {
                return new BadRequestObjectResult(ex.Message) {};
            }
            catch (InvalidOperationException ex)
            {
                return new ConflictObjectResult(ex.Message) {};
            }
            catch (Exception ex)
            {
                return new ObjectResult(ex.Message) { StatusCode = 500 };
            }
        }


        /// <summary>
        /// Update an user
        /// </summary>
        /// <param name="updatedUser">User to update</param>  
        [ProducesResponseType(typeof(UserInfoDetailDTO), 200)]
        [ProducesResponseType(typeof(string), 400)]
        [ProducesResponseType(typeof(string), 404)]
        [ProducesResponseType(typeof(string), 500)]
        [HttpPut]
        public ObjectResult UpdateUser([FromBody] UserInfo updatedUser)
        {
            try
            {
                if (updatedUser == null)
                    throw new ArgumentNullException("User param is null");

                UserInfo user = _userService.GetById(updatedUser.Id);

                if (user == null)
                    throw new KeyNotFoundException("User does not exist");

                UserInfo userModified = _userService.Update(updatedUser.Id, updatedUser);

                return new OkObjectResult(userModified.ToDTO());
            }
            catch (ArgumentNullException ex)
            {
                return new BadRequestObjectResult(ex.Message) {};
            }
            catch (KeyNotFoundException ex)
            {
                return new NotFoundObjectResult(ex.Message) {};
            }
            catch (Exception ex)
            {
                return new ObjectResult(ex.Message) { StatusCode = 500 };
            }
        }


        /// <summary>
        /// Delete an user
        /// </summary>
        /// <param name="id">Id of user to delete</param>  
        [ProducesResponseType(typeof(string), 202)]
        [ProducesResponseType(typeof(string), 400)]
        [ProducesResponseType(typeof(string), 404)]
        [ProducesResponseType(typeof(string), 500)]
        [HttpDelete("{id}")]
        public ObjectResult DeleteUser(string id)
        {
            try
            {
                if (id == null)
                    throw new ArgumentNullException("User param is null");

                UserInfo user = _userService.GetById(id);

                if (user == null)
                    throw new KeyNotFoundException("User does not exist");

                _userService.Remove(id);

                return new ObjectResult("The user has been deleted") { StatusCode = 202 };

            }
            catch (ArgumentNullException ex)
            {
                return new BadRequestObjectResult(ex.Message) { };
            }
            catch (KeyNotFoundException ex)
            {
                return new NotFoundObjectResult(ex.Message) { };
            }
            catch (Exception ex)
            {
                return new ObjectResult(ex.Message) { StatusCode = 500 };
            }
        }
    }
}