using Bit.Api.Controllers;
using Bit.Core;
using Bit.Core.Enums;
using Bit.Core.Exceptions;
using Bit.Core.Models.Api;
using Bit.Core.Models.Data;
using Bit.Core.Models.Table;
using Bit.Core.Repositories;
using Bit.Core.Services;
using Bit.Core.Settings;
using Microsoft.AspNetCore.Identity;
using NSubstitute;
using System;
using System.Security.Claims;
using System.Threading.Tasks;
using Xunit;

namespace Bit.Api.Test.Controllers
{
    public class AccountsControllerTests : IDisposable
    {

        private readonly AccountsController _sut;
        private readonly GlobalSettings _globalSettings;
        private readonly ICipherRepository _cipherRepository;
        private readonly IFolderRepository _folderRepository;
        private readonly IOrganizationService _organizationService;
        private readonly IOrganizationUserRepository _organizationUserRepository;
        private readonly IPaymentService _paymentService;
        private readonly ISsoUserRepository _ssoUserRepository;
        private readonly IUserRepository _userRepository;
        private readonly IUserService _userService;
        private readonly ISendRepository _sendRepository;
        private readonly ISendService _sendService;
        private readonly IProviderUserRepository _providerUserRepository;

        public AccountsControllerTests()
        {
            _userService = Substitute.For<IUserService>();
            _userRepository = Substitute.For<IUserRepository>();
            _cipherRepository = Substitute.For<ICipherRepository>();
            _folderRepository = Substitute.For<IFolderRepository>();
            _organizationService = Substitute.For<IOrganizationService>();
            _organizationUserRepository = Substitute.For<IOrganizationUserRepository>();
            _providerUserRepository = Substitute.For<IProviderUserRepository>();
            _paymentService = Substitute.For<IPaymentService>();
            _globalSettings = new GlobalSettings();
            _sendRepository = Substitute.For<ISendRepository>();
            _sendService = Substitute.For<ISendService>();
            _sut = new AccountsController(
                _globalSettings,
                _cipherRepository,
                _folderRepository,
                _organizationService,
                _organizationUserRepository,
                _providerUserRepository,
                _paymentService,
                _ssoUserRepository,
                _userRepository,
                _userService,
                _sendRepository,
                _sendService
            );
        }

        public void Dispose()
        {
            _sut?.Dispose();
        }

        [Fact]
        public async Task PostPrelogin_WhenUserExists_ShouldReturnUserKdfInfo()
        {
            var userKdfInfo = new UserKdfInformation
            {
                Kdf = KdfType.PBKDF2_SHA256,
                KdfIterations = 5000
            };
            _userRepository.GetKdfInformationByEmailAsync(Arg.Any<string>()).Returns(Task.FromResult(userKdfInfo));

            var response = await _sut.PostPrelogin(new PreloginRequestModel { Email = "user@example.com" });

            Assert.Equal(userKdfInfo.Kdf, response.Kdf);
            Assert.Equal(userKdfInfo.KdfIterations, response.KdfIterations);
        }

        [Fact]
        public async Task PostPrelogin_WhenUserDoesNotExist_ShouldDefaultToSha256And100000Iterations()
        {
            _userRepository.GetKdfInformationByEmailAsync(Arg.Any<string>()).Returns(Task.FromResult((UserKdfInformation)null));

            var response = await _sut.PostPrelogin(new PreloginRequestModel { Email = "user@example.com" });

            Assert.Equal(KdfType.PBKDF2_SHA256, response.Kdf);
            Assert.Equal(100000, response.KdfIterations);
        }

        [Fact]
        public async Task PostRegister_ShouldRegisterUser()
        {
            var passwordHash = "abcdef";
            var token = "123456";
            var userGuid = new Guid();
            _userService.RegisterUserAsync(Arg.Any<User>(), passwordHash, token, userGuid)
                        .Returns(Task.FromResult(IdentityResult.Success));
            var request = new RegisterRequestModel
            {
                Name = "Example User",
                Email = "user@example.com",
                MasterPasswordHash = passwordHash,
                MasterPasswordHint = "example",
                Token = token,
                OrganizationUserId = userGuid
            };

            await _sut.PostRegister(request);

            await _userService.Received(1).RegisterUserAsync(Arg.Any<User>(), passwordHash, token, userGuid);
        }

        [Fact]
        public async Task PostRegister_WhenUserServiceFails_ShouldThrowBadRequestException()
        {
            var passwordHash = "abcdef";
            var token = "123456";
            var userGuid = new Guid();
            _userService.RegisterUserAsync(Arg.Any<User>(), passwordHash, token, userGuid)
                        .Returns(Task.FromResult(IdentityResult.Failed()));
            var request = new RegisterRequestModel
            {
                Name = "Example User",
                Email = "user@example.com",
                MasterPasswordHash = passwordHash,
                MasterPasswordHint = "example",
                Token = token,
                OrganizationUserId = userGuid
            };

            await Assert.ThrowsAsync<BadRequestException>(() => _sut.PostRegister(request));
        }

        [Fact]
        public async Task PostPasswordHint_ShouldNotifyUserService()
        {
            var email = "user@example.com";

            await _sut.PostPasswordHint(new PasswordHintRequestModel { Email = email });

            await _userService.Received(1).SendMasterPasswordHintAsync(email);
        }

        [Fact]
        public async Task PostEmailToken_ShouldInitiateEmailChange()
        {
            var user = GenerateExampleUser();
            ConfigureUserServiceToReturnValidPrincipalFor(user);
            ConfigureUserServiceToAcceptPasswordFor(user);
            var newEmail = "example@user.com";

            await _sut.PostEmailToken(new EmailTokenRequestModel { NewEmail = newEmail });

            await _userService.Received(1).InitiateEmailChangeAsync(user, newEmail);
        }

        [Fact]
        public async Task PostEmailToken_WhenNotAuthorized_ShouldThrowUnauthorizedAccessException()
        {
            ConfigureUserServiceToReturnNullPrincipal();

            await Assert.ThrowsAsync<UnauthorizedAccessException>(
                () => _sut.PostEmailToken(new EmailTokenRequestModel())
            );
        }

        [Fact]
        public async Task PostEmailToken_WhenInvalidPasssword_ShouldThrowBadRequestException()
        {
            var user = GenerateExampleUser();
            ConfigureUserServiceToReturnValidPrincipalFor(user);
            ConfigureUserServiceToRejectPasswordFor(user);

            await Assert.ThrowsAsync<BadRequestException>(
                () => _sut.PostEmailToken(new EmailTokenRequestModel())
            );
        }

        [Fact]
        public async Task PostEmail_ShouldChangeUserEmail()
        {
            var user = GenerateExampleUser();
            ConfigureUserServiceToReturnValidPrincipalFor(user);
            _userService.ChangeEmailAsync(user, default, default, default, default, default)
                        .Returns(Task.FromResult(IdentityResult.Success));

            await _sut.PostEmail(new EmailRequestModel());

            await _userService.Received(1).ChangeEmailAsync(user, default, default, default, default, default);
        }

        [Fact]
        public async Task PostEmail_WhenNotAuthorized_ShouldThrownUnauthorizedAccessException()
        {
            ConfigureUserServiceToReturnNullPrincipal();

            await Assert.ThrowsAsync<UnauthorizedAccessException>(
                () => _sut.PostEmail(new EmailRequestModel())
            );
        }

        [Fact]
        public async Task PostEmail_WhenEmailCannotBeChanged_ShouldThrowBadRequestException()
        {
            var user = GenerateExampleUser();
            ConfigureUserServiceToReturnValidPrincipalFor(user);
            _userService.ChangeEmailAsync(user, default, default, default, default, default)
                        .Returns(Task.FromResult(IdentityResult.Failed()));

            await Assert.ThrowsAsync<BadRequestException>(
                () => _sut.PostEmail(new EmailRequestModel())
            );
        }

        [Fact]
        public async Task PostVerifyEmail_ShouldSendEmailVerification()
        {
            var user = GenerateExampleUser();
            ConfigureUserServiceToReturnValidPrincipalFor(user);

            await _sut.PostVerifyEmail();

            await _userService.Received(1).SendEmailVerificationAsync(user);
        }

        [Fact]
        public async Task PostVerifyEmail_WhenNotAuthorized_ShouldThrownUnauthorizedAccessException()
        {
            ConfigureUserServiceToReturnNullPrincipal();

            await Assert.ThrowsAsync<UnauthorizedAccessException>(
                () => _sut.PostVerifyEmail()
            );
        }

        [Fact]
        public async Task PostVerifyEmailToken_ShouldConfirmEmail()
        {
            var user = GenerateExampleUser();
            ConfigureUserServiceToReturnValidIdFor(user);
            _userService.ConfirmEmailAsync(user, Arg.Any<string>())
                        .Returns(Task.FromResult(IdentityResult.Success));

            await _sut.PostVerifyEmailToken(new VerifyEmailRequestModel { UserId = "12345678-1234-1234-1234-123456789012" });

            await _userService.Received(1).ConfirmEmailAsync(user, Arg.Any<string>());
        }

        [Fact]
        public async Task PostVerifyEmailToken_WhenUserDoesNotExist_ShouldThrowUnauthorizedAccessException()
        {
            var user = GenerateExampleUser();
            ConfigureUserServiceToReturnNullUserId();

            await Assert.ThrowsAsync<UnauthorizedAccessException>(
                () => _sut.PostVerifyEmailToken(new VerifyEmailRequestModel { UserId = "12345678-1234-1234-1234-123456789012" })
            );
        }

        [Fact]
        public async Task PostVerifyEmailToken_WhenEmailConfirmationFails_ShouldThrowBadRequestException()
        {
            var user = GenerateExampleUser();
            ConfigureUserServiceToReturnValidIdFor(user);
            _userService.ConfirmEmailAsync(user, Arg.Any<string>())
                        .Returns(Task.FromResult(IdentityResult.Failed()));

            await Assert.ThrowsAsync<BadRequestException>(
                () => _sut.PostVerifyEmailToken(new VerifyEmailRequestModel { UserId = "12345678-1234-1234-1234-123456789012" })
            );
        }

        [Fact]
        public async Task PostPassword_ShouldChangePassword()
        {
            var user = GenerateExampleUser();
            ConfigureUserServiceToReturnValidPrincipalFor(user);
            _userService.ChangePasswordAsync(user, default, default, default)
                        .Returns(Task.FromResult(IdentityResult.Success));

            await _sut.PostPassword(new PasswordRequestModel());

            await _userService.Received(1).ChangePasswordAsync(user, default, default, default);
        }

        [Fact]
        public async Task PostPassword_WhenNotAuthorized_ShouldThrowUnauthorizedAccessException()
        {
            ConfigureUserServiceToReturnNullPrincipal();

            await Assert.ThrowsAsync<UnauthorizedAccessException>(
                () => _sut.PostPassword(new PasswordRequestModel())
            );
        }

        [Fact]
        public async Task PostPassword_WhenPasswordChangeFails_ShouldBadRequestException()
        {
            var user = GenerateExampleUser();
            ConfigureUserServiceToReturnValidPrincipalFor(user);
            _userService.ChangePasswordAsync(user, default, default, default)
                        .Returns(Task.FromResult(IdentityResult.Failed()));

            await Assert.ThrowsAsync<BadRequestException>(
                () => _sut.PostPassword(new PasswordRequestModel())
            );
        }

        [Fact]
        public async Task GetApiKey_ShouldReturnApiKeyResponse()
        {
            var user = GenerateExampleUser();
            ConfigureUserServiceToReturnValidPrincipalFor(user);
            ConfigureUserServiceToAcceptPasswordFor(user);
            await _sut.ApiKey(new ApiKeyRequestModel());
        }

        [Fact]
        public async Task GetApiKey_WhenUserDoesNotExist_ShouldThrowUnauthorizedAccessException()
        {
            ConfigureUserServiceToReturnNullPrincipal();

            await Assert.ThrowsAsync<UnauthorizedAccessException>(
                () => _sut.ApiKey(new ApiKeyRequestModel())
            );
        }

        [Fact]
        public async Task GetApiKey_WhenPasswordCheckFails_ShouldThrowBadRequestException()
        {
            var user = GenerateExampleUser();
            ConfigureUserServiceToReturnValidPrincipalFor(user);
            ConfigureUserServiceToRejectPasswordFor(user);
            await Assert.ThrowsAsync<BadRequestException>(
                () => _sut.ApiKey(new ApiKeyRequestModel())
            );
        }

        [Fact]
        public async Task PostRotateApiKey_ShouldRotateApiKey()
        {
            var user = GenerateExampleUser();
            ConfigureUserServiceToReturnValidPrincipalFor(user);
            ConfigureUserServiceToAcceptPasswordFor(user);
            await _sut.RotateApiKey(new ApiKeyRequestModel());
        }

        [Fact]
        public async Task PostRotateApiKey_WhenUserDoesNotExist_ShouldThrowUnauthorizedAccessException()
        {
            ConfigureUserServiceToReturnNullPrincipal();

            await Assert.ThrowsAsync<UnauthorizedAccessException>(
                () => _sut.ApiKey(new ApiKeyRequestModel())
            );
        }

        [Fact]
        public async Task PostRotateApiKey_WhenPasswordCheckFails_ShouldThrowBadRequestException()
        {
            var user = GenerateExampleUser();
            ConfigureUserServiceToReturnValidPrincipalFor(user);
            ConfigureUserServiceToRejectPasswordFor(user);
            await Assert.ThrowsAsync<BadRequestException>(
                () => _sut.ApiKey(new ApiKeyRequestModel())
            );
        }

        // Below are helper functions that currently belong to this
        // test class, but ultimately may need to be split out into
        // something greater in order to share common test steps with
        // other test suites. They are included here for the time being
        // until that day comes.
        private User GenerateExampleUser()
        {
            return new User
            {
                Email = "user@example.com"
            };
        }

        private void ConfigureUserServiceToReturnNullPrincipal()
        {
            _userService.GetUserByPrincipalAsync(Arg.Any<ClaimsPrincipal>())
                        .Returns(Task.FromResult((User)null));
        }

        private void ConfigureUserServiceToReturnValidPrincipalFor(User user)
        {
            _userService.GetUserByPrincipalAsync(Arg.Any<ClaimsPrincipal>())
                        .Returns(Task.FromResult(user));
        }

        private void ConfigureUserServiceToRejectPasswordFor(User user)
        {
            _userService.CheckPasswordAsync(user, Arg.Any<string>())
                        .Returns(Task.FromResult(false));
        }

        private void ConfigureUserServiceToAcceptPasswordFor(User user)
        {
            _userService.CheckPasswordAsync(user, Arg.Any<string>())
                        .Returns(Task.FromResult(true));
        }

        private void ConfigureUserServiceToReturnValidIdFor(User user)
        {
            _userService.GetUserByIdAsync(Arg.Any<Guid>())
                        .Returns(Task.FromResult(user));
        }

        private void ConfigureUserServiceToReturnNullUserId()
        {
            _userService.GetUserByIdAsync(Arg.Any<Guid>())
                        .Returns(Task.FromResult((User)null));
        }
    }
}