using Microsoft.Extensions.Caching.Distributed;
using qtc_api.Extensions;
using System.Security.Claims;

namespace qtc_api.Controllers
{
    [Route("api/users")]
    [ApiController]
    public class UsersController : ControllerBase
    {
        private readonly IUserService _userService;
        private readonly IDistributedCache _cache;
        private readonly IHubContext<ChatHub> _chatGWContext;
        public UsersController(IUserService userService, IDistributedCache distributedCache, IHubContext<ChatHub> chatGWContext)
        {
            _userService = userService;
            _cache = distributedCache;
            _chatGWContext = chatGWContext;
        }

        [HttpGet("all")]
        [Authorize]
        public async Task<ActionResult<ServiceResponse<List<UserInformationDto>>>> GetAllUsers()
        {
            var users = await _userService.GetAllUsers();
            return Ok(users);
        }

        [HttpGet("user-info")]
        [Authorize]
        public async Task<ActionResult<ServiceResponse<UserInformationDto>>> GetUserInformation(string id)
        {
            var user = await _userService.GetUserInformationById(id);
            return Ok(user);
        }

        [HttpGet("user-authorized")]
        [Authorize]
        public async Task<ActionResult<ServiceResponse<User>>> UserFromAuthorizeHead()
        {
            var identity = HttpContext.User.Identity as ClaimsIdentity;

            if (identity != null)
            {
                IEnumerable<Claim> claims = identity.Claims;
                var id = claims.First().Value;

                if (id != null)
                {
                    var user = await _userService.GetUserById(id);
                    return Ok(user);
                }
                else
                {
                    return BadRequest("Token did not contain an ID.");
                }
            }
            else
            {
                return BadRequest("Header not found.");
            }
        }

        [HttpPut("update")]
        [Authorize]
        public async Task<ActionResult<ServiceResponse<UserInformationDto>>> UpdateUserInformation(UserUpdateInformationDto user)
        {
            var identity = HttpContext.User.Identity as ClaimsIdentity;

            if (identity != null)
            {
                IEnumerable<Claim> claims = identity.Claims;
                var id = claims.First().Value;

                if (id != null && id == user.Id)
                {
                    var updatedUser = await _userService.UpdateUserInfo(user);
                    if (updatedUser.Success && updatedUser.Data != null)
                    {
                        await _chatGWContext.Clients.All.SendAsync("UpdateUser", user);
                        await _chatGWContext.Clients.User(updatedUser.Data.Id).SendAsync("UpdateCurrentUser");

                        return Ok(updatedUser);
                    }
                    else return Ok();
                }
                else
                {
                    return Unauthorized("You are not authorized to edit that user.");
                }
            }
            else
            {
                return BadRequest("Session Expired.");
            }
        }

        [HttpPost("upload-profile-pic")]
        [Authorize]
        public async Task<ActionResult<ServiceResponse<string>>> UploadOrUpdateProfilePic(string userId, IFormFile file)
        {
            var identity = HttpContext.User.Identity as ClaimsIdentity;

            if (identity != null)
            {
                IEnumerable<Claim> claims = identity.Claims;
                var id = claims.First().Value;

                if (id != null && id == userId)
                {
                    if (file.Length > 3000000)
                    {
                        return BadRequest("File Is Above Limit.");
                    }

                    var response = await _userService.UpdateUserPic(userId, file);

                    var res = await _userService.GetUserById(id);
                    User? user = res.Data;

                    UserInformationDto dto = new();
                    if (user != null)
                        dto.MapToUser(user);

                    await _chatGWContext.Clients.All.SendAsync("UpdateUser", dto);

                    // always try to overwrite cache when updating pfp
                    string recordId = $"UserPfp_{userId}";
                    using var stream = file.OpenReadStream();
                    using var ms = new MemoryStream();
                    stream.CopyTo(ms);
                    await _cache.SetImageAsync(recordId, ms.ToArray(), TimeSpan.FromHours(1));

                    await _chatGWContext.Clients.User(id).SendAsync("UpdateCurrentUser");
                    return Ok(response);
                }
                else
                {
                    return BadRequest("You are not permitted to edit that user.");
                }
            }
            else
            {
                return BadRequest("No Identity.");
            }
        }

        [HttpGet("profile-pic/{userId}")]
        [Authorize]
        public async Task<ActionResult> GetUserProfilePicture(string userId)
        {
            string recordId = $"UserPfp_{userId}";
            byte[]? pfpBytes = await _cache.GetImageAsync(recordId);

            var result = new ServiceResponse<FileContentResult>();
            if (pfpBytes == null)
            {
                result = await _userService.GetUserPic(userId);
                if (result != null && result.Success && result.Data != null)
                {
                    pfpBytes = result.Data.FileContents;
                    await _cache.SetImageAsync(recordId, pfpBytes, TimeSpan.FromHours(1));
                }
            }
            else
            {
                // explicitly set from cache
                result.Success = true;
                result.Data = new FileContentResult(pfpBytes, "image/jpeg");
            }

            if (result != null && result.Success != false)
            {
                return result.Data!;
            }
            else if (result!.Message == "User Does Not Have A Profile Picture." || result!.Message == "User Content Folder Does Not Exist Yet.")
            {
                return BadRequest("User has no profile picture.");
            }
            else
            {
                return BadRequest("Failed To Get Profile Picture.");
            }
        }

        [HttpDelete("delete-user")]
        [Authorize(Roles = "Admin")]
        public async Task<ActionResult<ServiceResponse<User>>> DeleteUserById(string id)
        {
            var result = await _userService.DeleteUser(id);
            await _chatGWContext.Clients.All.SendAsync("RefreshUserLists");
            if (result != null && result.Success && result.Data != null) await _chatGWContext.Clients.User(result.Data.Id).SendAsync("ForceSignOut");
            return Ok(result);
        }

        [HttpPost("update-user-currency")]
        [Authorize]
        public async Task<ActionResult<ServiceResponse<int>>> UpdateUserCurrency(int amount, bool isSpinClaim)
        {
            var identity = HttpContext.User.Identity as ClaimsIdentity;

            if (identity != null)
            {
                IEnumerable<Claim> claims = identity.Claims;
                var id = claims.First().Value;
                var _res = await _userService.AddCurrencyToUser(id, amount, isSpinClaim);
                if (_res.Success)
                {
                    await _chatGWContext.Clients.User(id).SendAsync("UpdateCurrentUser");
                    return Ok(_res);
                }
                else return Ok(new ServiceResponse<int> { Success = false, Message = "Identity Has No User ID" });
            }
            else return Ok(new ServiceResponse<int> { Success = false, Message = "No Identity" });
        }
    }
}