using Govor.Application.Interfaces;
using Govor.Application.Interfaces.Infrastructure.Extensions;
using Govor.Core.Models;
using Govor.Core.Repositories.PrivateChats;
using Govor.Core.Repositories.Users;
using Govor.Data.Repositories.Exceptions;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;

namespace Govor.API.Controllers;

[ApiController]
[Authorize(Roles = "Admin, User")]
[Route("api")]
public class PrivateChatController : Controller
{
    private readonly ICurrentUserService _currentUser;
    private readonly IUsersRepository _usersRepository; 
    private readonly IVerifyFriendship _verifyFriendship;
    private readonly IPrivateChatsRepository _privateChats;
    private readonly ILogger<ChatLoadController> _logger;
    
    public PrivateChatController(
        ICurrentUserService currentUser, 
        IUsersRepository usersRepository,
        IVerifyFriendship verifyFriendship, 
        IPrivateChatsRepository privateChats,
        ILogger<ChatLoadController> logger)
    {
        _currentUser = currentUser;
        _usersRepository = usersRepository;
        _verifyFriendship = verifyFriendship;
        _privateChats = privateChats;
        _logger = logger;
    }
    
    [HttpGet("user/{friendId:guid}/private-chat")]
    public async Task<IActionResult> GetChatByFriendId(Guid friendId)
    {
        try
        {
            var currentId = _currentUser.GetCurrentUserId();

            if (!await _usersRepository.ExistsByIdAsync(friendId))
            {
                _logger.LogWarning("User not exist {0}", friendId);
                return NotFound("User not exist.");
            }

            await _verifyFriendship.VerifyAsync(currentId, friendId);
            

            var chatId = await GetPrivateChatsIdAsync(currentId, friendId);
            return Ok(chatId);
        }
        catch (UnauthorizedAccessException ex)
        {
            _logger.LogWarning(ex.Message);
            return Forbid(ex.Message);
        }
        catch (NotFoundException ex)
        {
            _logger.LogWarning(ex, ex.Message);
            return BadRequest(ex.Message);
        }
        catch (ArgumentException ex)
        {
            _logger.LogWarning(ex, ex.Message);
            return BadRequest(ex.Message);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, ex.Message);
            return StatusCode(500, "Unexpected Error! Please try again later.");
        }
    }
    
    private async Task<Guid> GetPrivateChatsIdAsync(Guid userA, Guid userB)
    {
        Guid recipientId;
        // Makes new PrivateChat if not exist
        if (!_privateChats.Exist(userA, userB))
        {
            recipientId = Guid.NewGuid();
            await _privateChats.AddAsync(new PrivateChat()
                { Id = recipientId, UserAId = userA, UserBId = userB });
        }
        else
        {
            recipientId = (await _privateChats.GetByMembersAsync(userA, userB)).Id;
        }
        
        return recipientId;
    }
}