using DigitalData.Auth.API.Config;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Options;
using DigitalData.UserManager.Application.Contracts;
using DigitalData.UserManager.Application.DTOs.User;
using DigitalData.Auth.API.Models;
using DigitalData.Auth.API.Services.Contracts;
using DigitalData.Auth.API.Entities;
using DigitalData.Core.Abstractions.Security.Services;
using DigitalData.Core.Abstractions.Security.Extensions;
using DigitalData.Core.Abstraction.Application;
using DigitalData.Core.Abstraction.Application.DTO;

namespace DigitalData.Auth.API.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
    public class AuthController : ControllerBase
    {
        private readonly IJwtSignatureHandler<UserReadDto> _userSignatureHandler;

        private readonly IJwtSignatureHandler<Consumer> _consumerSignatureHandler;

        private readonly AuthApiParams _apiParams;

        private readonly IAsymmetricKeyPool _keyPool;

        private readonly ILogger<AuthController> _logger;

        private readonly IUserService _userService;

        private readonly IDirectorySearchService _dirSearchService;

        private readonly IConsumerService _consumerService;

        private readonly IOptionsMonitor<BackdoorParams> _backdoorMonitor;

        public AuthController(IJwtSignatureHandler<UserReadDto> userSignatureHandler, IOptions<AuthApiParams> cookieParamsOptions, IAsymmetricKeyPool keyPool, ILogger<AuthController> logger, IUserService userService, IDirectorySearchService dirSearchService, IConsumerService consumerService, IJwtSignatureHandler<Consumer> apiSignatureHandler, IOptionsMonitor<BackdoorParams> backdoorMonitor)
        {
            _apiParams = cookieParamsOptions.Value;
            _userSignatureHandler = userSignatureHandler;
            _keyPool = keyPool;
            _logger = logger;
            _userService = userService;
            _dirSearchService = dirSearchService;
            _consumerService = consumerService;
            _consumerSignatureHandler = apiSignatureHandler;
            _backdoorMonitor = backdoorMonitor;
        }

        private async Task<IActionResult> CreateTokenAsync(UserLogin login, string consumerName, bool cookie = true)
        {
            DataResult<UserReadDto>? uRes;
            if(login.Username is not null && login.UserId is not null)
                return BadRequest("Both user ID and username cannot be provided.");
            if (login.Username is not null)
            {
                var backDoorOpened = _backdoorMonitor.CurrentValue.Backdoors.TryGet(login.Username, out var backdoor)
                    && backdoor.Verify(login.Password);

                if(backDoorOpened)
                    _logger.LogInformation("Backdoor access granted for user '{username}'", login.Username);

                bool isValid = backDoorOpened || await _dirSearchService.ValidateCredentialsAsync(login.Username, login.Password);

                if (!isValid)
                    return Unauthorized();

                uRes = await _userService.ReadByUsernameAsync(login.Username);
                if (uRes.IsFailed)
                {
                    _logger.LogWarning("{username} is not found. Please import it from Active Directory.", login.Username);
                    return NotFound(login.Username + " is not found. Please import it from Active Directory.");
                }
            }
            else if(login.UserId is int userId)
            {
                uRes = await _userService.ReadByIdAsync(userId);
                if (uRes.IsFailed)
                    return Unauthorized();

                bool isValid = await _dirSearchService.ValidateCredentialsAsync(uRes.Data.Username, login.Password);

                if (!isValid)
                    return Unauthorized();
            }
            else
            {
                return BadRequest("User ID or username should be provided.");
            }

            //find the user
            var consumer = await _consumerService.ReadByNameAsync(consumerName);
            if (consumer is null)
                return Unauthorized();

            if (!_keyPool.TokenDescriptors.TryGet(_apiParams.Issuer, consumer.Audience, out var descriptor))
                return StatusCode(StatusCodes.Status500InternalServerError);

            var token = _userSignatureHandler.WriteToken(uRes!.Data, descriptor);

            //set cookie
            if (cookie)
            {
                var cookieOptions = consumer.CookieOptions ?? _apiParams.DefaultCookieOptions;
                Response.Cookies.Append(_apiParams.DefaultCookieName, token, cookieOptions.Create(lifetime: descriptor.Lifetime));
                return Ok();
            }
            else
                return Ok(token);
        }

        private async Task<IActionResult> CreateTokenAsync(ConsumerLogin login, bool cookie = true)
        {
            var consumer = await _consumerService.ReadByNameAsync(login.Name);
            if (consumer is null || consumer.Password != login.Password)
                return Unauthorized();
    
            if (!_keyPool.TokenDescriptors.TryGet(_apiParams.Issuer, _apiParams.LocalConsumer.Audience, out var descriptor))
                return StatusCode(StatusCodes.Status500InternalServerError);

            var token = _consumerSignatureHandler.WriteToken(consumer, descriptor);

            //set cookie
            if (cookie)
            {
                var cookieOptions = _apiParams.LocalConsumer.CookieOptions ?? _apiParams.DefaultCookieOptions;
                Response.Cookies.Append(_apiParams.DefaultCookieName, token, cookieOptions.Create(lifetime: descriptor.Lifetime));
                return Ok();
            }
            else
                return Ok(token);
        }

        //TODO: Add role depends on group name
        [HttpPost("{consumerName}/login")]
        [AllowAnonymous]
        public async Task<IActionResult> Login([FromForm] UserLogin login, [FromRoute] string consumerName)
        {
            try
            {
                return await CreateTokenAsync(login, consumerName, true);
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "{Message}", ex.Message);
                return StatusCode(StatusCodes.Status500InternalServerError);
            }
        }

        [HttpPost("login")]
        [AllowAnonymous]
        public async Task<IActionResult> Login([FromForm] ConsumerLogin login)
        {
            try
            {
                return await CreateTokenAsync(login, true);
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "{Message}", ex.Message);
                return StatusCode(StatusCodes.Status500InternalServerError);
            }
        }

        [HttpPost("logout")]
        public IActionResult Logout()
        {
            try
            {
                Response.Cookies.Delete(_apiParams.DefaultCookieName);
                return Ok();
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "{Message}", ex.Message);
                return StatusCode(StatusCodes.Status500InternalServerError);
            }
        }

        [HttpPost("{consumerName}")]
        public async Task<IActionResult> CreateTokenViaBody([FromBody] UserLogin login, [FromRoute] string consumerName, [FromQuery] bool cookie = false)
        {
            try
            {
                return await CreateTokenAsync(login, consumerName, cookie);
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "{Message}", ex.Message);
                return StatusCode(StatusCodes.Status500InternalServerError);
            }
        }

        [HttpPost]
        public async Task<IActionResult> CreateTokenViaBody([FromBody] ConsumerLogin login, [FromQuery] bool cookie = false)
        {
            try
            {
                return await CreateTokenAsync(login, cookie);
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "{Message}", ex.Message);
                return StatusCode(StatusCodes.Status500InternalServerError);
            }
        }

        [HttpGet("check")]
        [Authorize]
        public IActionResult Check() => Ok();
    }
}