using MikrocopApi.Dtos;
using MikrocopApi.Exceptions;
using MikrocopApi.Services;
using MikrocopDb.Entities;
using MikrocopDb.Repositories;
using Moq;

namespace MikrocopTests;

[TestFixture]
public sealed class UserServiceTests
{
    [Test]
    public async Task CreateAsync_ReturnsCreatedUser_WhenRequestIsValid()
    {
        var repositoryMock = new Mock<IUserRepository>(MockBehavior.Strict);
        var hashingServiceMock = new Mock<IPasswordHashingService>(MockBehavior.Strict);
        var request = CreateRequest();

        repositoryMock.Setup(x => x.GetByUserNameAsync(request.UserName, It.IsAny<CancellationToken>()))
            .ReturnsAsync((UserEntity?)null);
        repositoryMock.Setup(x => x.GetByEmailAsync(request.Email, It.IsAny<CancellationToken>()))
            .ReturnsAsync((UserEntity?)null);
        hashingServiceMock.Setup(x => x.HashPassword(request.Password))
            .Returns(("hash-value", "salt-value"));
        repositoryMock.Setup(x => x.AddAsync(It.IsAny<UserEntity>(), It.IsAny<CancellationToken>()))
            .Returns(Task.CompletedTask);

        var sut = new UserService(repositoryMock.Object, hashingServiceMock.Object);

        var result = await sut.CreateAsync(request);

        Assert.That(result.UserName, Is.EqualTo("new-user"));
        Assert.That(result.Email, Is.EqualTo("new.user@example.com"));
        repositoryMock.Verify(x => x.AddAsync(It.Is<UserEntity>(u =>
                u.UserName == "new-user" &&
                u.FullName == "New User" &&
                u.Email == "new.user@example.com" &&
                u.PasswordHash == "hash-value" &&
                u.PasswordSalt == "salt-value"),
            It.IsAny<CancellationToken>()), Times.Once);
        repositoryMock.VerifyAll();
        hashingServiceMock.VerifyAll();
    }

    [Test]
    public void CreateAsync_ThrowsConflict_WhenUserNameExists()
    {
        var repositoryMock = new Mock<IUserRepository>(MockBehavior.Strict);
        var hashingServiceMock = new Mock<IPasswordHashingService>(MockBehavior.Strict);
        var request = CreateRequest();

        repositoryMock.Setup(x => x.GetByUserNameAsync(request.UserName, It.IsAny<CancellationToken>()))
            .ReturnsAsync(CreateEntity());

        var sut = new UserService(repositoryMock.Object, hashingServiceMock.Object);

        Assert.ThrowsAsync<ConflictException>(() => sut.CreateAsync(request));
        repositoryMock.VerifyAll();
        hashingServiceMock.VerifyNoOtherCalls();
    }

    [Test]
    public void CreateAsync_ThrowsConflict_WhenEmailExists()
    {
        var repositoryMock = new Mock<IUserRepository>(MockBehavior.Strict);
        var hashingServiceMock = new Mock<IPasswordHashingService>(MockBehavior.Strict);
        var request = CreateRequest();

        repositoryMock.Setup(x => x.GetByUserNameAsync(request.UserName, It.IsAny<CancellationToken>()))
            .ReturnsAsync((UserEntity?)null);
        repositoryMock.Setup(x => x.GetByEmailAsync(request.Email, It.IsAny<CancellationToken>()))
            .ReturnsAsync(CreateEntity());

        var sut = new UserService(repositoryMock.Object, hashingServiceMock.Object);

        Assert.ThrowsAsync<ConflictException>(() => sut.CreateAsync(request));
        repositoryMock.VerifyAll();
        hashingServiceMock.VerifyNoOtherCalls();
    }

    [Test]
    public void CreateAsync_ThrowsBadRequest_WhenPasswordIsNotComplexEnough()
    {
        var repositoryMock = new Mock<IUserRepository>(MockBehavior.Strict);
        var hashingServiceMock = new Mock<IPasswordHashingService>(MockBehavior.Strict);
        var request = CreateRequest();
        request.Password = "weak";

        repositoryMock.Setup(x => x.GetByUserNameAsync(request.UserName, It.IsAny<CancellationToken>()))
            .ReturnsAsync((UserEntity?)null);
        repositoryMock.Setup(x => x.GetByEmailAsync(request.Email, It.IsAny<CancellationToken>()))
            .ReturnsAsync((UserEntity?)null);

        var sut = new UserService(repositoryMock.Object, hashingServiceMock.Object);

        Assert.ThrowsAsync<BadRequestException>(() => sut.CreateAsync(request));
        repositoryMock.VerifyAll();
        hashingServiceMock.VerifyNoOtherCalls();
    }

    [Test]
    public async Task UpdateAsync_UpdatesUserWithoutPassword_WhenPasswordIsNotProvided()
    {
        var repositoryMock = new Mock<IUserRepository>(MockBehavior.Strict);
        var hashingServiceMock = new Mock<IPasswordHashingService>(MockBehavior.Strict);
        var id = Guid.NewGuid();
        var existing = CreateEntity(id);
        var request = CreateUpdateRequest(password: null);

        repositoryMock.Setup(x => x.GetByIdAsync(id, It.IsAny<CancellationToken>()))
            .ReturnsAsync(existing);
        repositoryMock.Setup(x => x.GetByUserNameAsync(request.UserName, It.IsAny<CancellationToken>()))
            .ReturnsAsync((UserEntity?)null);
        repositoryMock.Setup(x => x.GetByEmailAsync(request.Email, It.IsAny<CancellationToken>()))
            .ReturnsAsync((UserEntity?)null);
        repositoryMock.Setup(x => x.UpdateAsync(existing, It.IsAny<CancellationToken>()))
            .Returns(Task.CompletedTask);

        var sut = new UserService(repositoryMock.Object, hashingServiceMock.Object);

        await sut.UpdateAsync(id, request);

        Assert.That(existing.UserName, Is.EqualTo(request.UserName));
        Assert.That(existing.PasswordHash, Is.EqualTo("hash"));
        repositoryMock.VerifyAll();
        hashingServiceMock.VerifyNoOtherCalls();
    }

    [Test]
    public async Task UpdateAsync_HashesPassword_WhenPasswordIsProvided()
    {
        var repositoryMock = new Mock<IUserRepository>(MockBehavior.Strict);
        var hashingServiceMock = new Mock<IPasswordHashingService>(MockBehavior.Strict);
        var id = Guid.NewGuid();
        var existing = CreateEntity(id);
        var request = CreateUpdateRequest(password: "UpdatedPassword!123");

        repositoryMock.Setup(x => x.GetByIdAsync(id, It.IsAny<CancellationToken>()))
            .ReturnsAsync(existing);
        repositoryMock.Setup(x => x.GetByUserNameAsync(request.UserName, It.IsAny<CancellationToken>()))
            .ReturnsAsync((UserEntity?)null);
        repositoryMock.Setup(x => x.GetByEmailAsync(request.Email, It.IsAny<CancellationToken>()))
            .ReturnsAsync((UserEntity?)null);
        hashingServiceMock.Setup(x => x.HashPassword(request.Password!))
            .Returns(("new-hash", "new-salt"));
        repositoryMock.Setup(x => x.UpdateAsync(existing, It.IsAny<CancellationToken>()))
            .Returns(Task.CompletedTask);

        var sut = new UserService(repositoryMock.Object, hashingServiceMock.Object);

        await sut.UpdateAsync(id, request);

        Assert.That(existing.PasswordHash, Is.EqualTo("new-hash"));
        Assert.That(existing.PasswordSalt, Is.EqualTo("new-salt"));
        repositoryMock.VerifyAll();
        hashingServiceMock.VerifyAll();
    }

    [Test]
    public void UpdateAsync_ThrowsNotFound_WhenUserDoesNotExist()
    {
        var repositoryMock = new Mock<IUserRepository>(MockBehavior.Strict);
        var hashingServiceMock = new Mock<IPasswordHashingService>(MockBehavior.Strict);
        var id = Guid.NewGuid();
        var request = CreateUpdateRequest(password: null);

        repositoryMock.Setup(x => x.GetByIdAsync(id, It.IsAny<CancellationToken>()))
            .ReturnsAsync((UserEntity?)null);

        var sut = new UserService(repositoryMock.Object, hashingServiceMock.Object);

        Assert.ThrowsAsync<NotFoundException>(() => sut.UpdateAsync(id, request));
        repositoryMock.VerifyAll();
        hashingServiceMock.VerifyNoOtherCalls();
    }

    [Test]
    public void UpdateAsync_ThrowsConflict_WhenUserNameBelongsToAnotherUser()
    {
        var repositoryMock = new Mock<IUserRepository>(MockBehavior.Strict);
        var hashingServiceMock = new Mock<IPasswordHashingService>(MockBehavior.Strict);
        var id = Guid.NewGuid();
        var request = CreateUpdateRequest(password: null);

        repositoryMock.Setup(x => x.GetByIdAsync(id, It.IsAny<CancellationToken>()))
            .ReturnsAsync(CreateEntity(id));
        repositoryMock.Setup(x => x.GetByUserNameAsync(request.UserName, It.IsAny<CancellationToken>()))
            .ReturnsAsync(CreateEntity(Guid.NewGuid()));

        var sut = new UserService(repositoryMock.Object, hashingServiceMock.Object);

        Assert.ThrowsAsync<ConflictException>(() => sut.UpdateAsync(id, request));
        repositoryMock.VerifyAll();
        hashingServiceMock.VerifyNoOtherCalls();
    }

    [Test]
    public void UpdateAsync_ThrowsConflict_WhenEmailBelongsToAnotherUser()
    {
        var repositoryMock = new Mock<IUserRepository>(MockBehavior.Strict);
        var hashingServiceMock = new Mock<IPasswordHashingService>(MockBehavior.Strict);
        var id = Guid.NewGuid();
        var request = CreateUpdateRequest(password: null);

        repositoryMock.Setup(x => x.GetByIdAsync(id, It.IsAny<CancellationToken>()))
            .ReturnsAsync(CreateEntity(id));
        repositoryMock.Setup(x => x.GetByUserNameAsync(request.UserName, It.IsAny<CancellationToken>()))
            .ReturnsAsync((UserEntity?)null);
        repositoryMock.Setup(x => x.GetByEmailAsync(request.Email, It.IsAny<CancellationToken>()))
            .ReturnsAsync(CreateEntity(Guid.NewGuid()));

        var sut = new UserService(repositoryMock.Object, hashingServiceMock.Object);

        Assert.ThrowsAsync<ConflictException>(() => sut.UpdateAsync(id, request));
        repositoryMock.VerifyAll();
        hashingServiceMock.VerifyNoOtherCalls();
    }

    [Test]
    public void UpdateAsync_ThrowsBadRequest_WhenProvidedPasswordIsWeak()
    {
        var repositoryMock = new Mock<IUserRepository>(MockBehavior.Strict);
        var hashingServiceMock = new Mock<IPasswordHashingService>(MockBehavior.Strict);
        var id = Guid.NewGuid();
        var request = CreateUpdateRequest(password: "weak");

        repositoryMock.Setup(x => x.GetByIdAsync(id, It.IsAny<CancellationToken>()))
            .ReturnsAsync(CreateEntity(id));
        repositoryMock.Setup(x => x.GetByUserNameAsync(request.UserName, It.IsAny<CancellationToken>()))
            .ReturnsAsync((UserEntity?)null);
        repositoryMock.Setup(x => x.GetByEmailAsync(request.Email, It.IsAny<CancellationToken>()))
            .ReturnsAsync((UserEntity?)null);

        var sut = new UserService(repositoryMock.Object, hashingServiceMock.Object);

        Assert.ThrowsAsync<BadRequestException>(() => sut.UpdateAsync(id, request));
        repositoryMock.VerifyAll();
        hashingServiceMock.VerifyNoOtherCalls();
    }

    [Test]
    public async Task GetByIdAsync_ReturnsUser_WhenUserExists()
    {
        var repositoryMock = new Mock<IUserRepository>(MockBehavior.Strict);
        var hashingServiceMock = new Mock<IPasswordHashingService>(MockBehavior.Strict);
        var id = Guid.NewGuid();
        var user = CreateEntity(id);

        repositoryMock.Setup(x => x.GetByIdAsync(id, It.IsAny<CancellationToken>()))
            .ReturnsAsync(user);

        var sut = new UserService(repositoryMock.Object, hashingServiceMock.Object);

        var result = await sut.GetByIdAsync(id);

        Assert.That(result.Id, Is.EqualTo(id));
        Assert.That(result.UserName, Is.EqualTo(user.UserName));
        repositoryMock.VerifyAll();
        hashingServiceMock.VerifyNoOtherCalls();
    }

    [Test]
    public void GetByIdAsync_ThrowsNotFound_WhenUserDoesNotExist()
    {
        var repositoryMock = new Mock<IUserRepository>(MockBehavior.Strict);
        var hashingServiceMock = new Mock<IPasswordHashingService>(MockBehavior.Strict);
        var id = Guid.NewGuid();

        repositoryMock.Setup(x => x.GetByIdAsync(id, It.IsAny<CancellationToken>()))
            .ReturnsAsync((UserEntity?)null);

        var sut = new UserService(repositoryMock.Object, hashingServiceMock.Object);

        Assert.ThrowsAsync<NotFoundException>(() => sut.GetByIdAsync(id));
        repositoryMock.VerifyAll();
        hashingServiceMock.VerifyNoOtherCalls();
    }

    [Test]
    public async Task DeleteAsync_DeletesUser_WhenUserExists()
    {
        var repositoryMock = new Mock<IUserRepository>(MockBehavior.Strict);
        var hashingServiceMock = new Mock<IPasswordHashingService>(MockBehavior.Strict);
        var id = Guid.NewGuid();
        var user = CreateEntity(id);

        repositoryMock.Setup(x => x.GetByIdAsync(id, It.IsAny<CancellationToken>()))
            .ReturnsAsync(user);
        repositoryMock.Setup(x => x.DeleteAsync(user, It.IsAny<CancellationToken>()))
            .Returns(Task.CompletedTask);

        var sut = new UserService(repositoryMock.Object, hashingServiceMock.Object);

        await sut.DeleteAsync(id);

        repositoryMock.VerifyAll();
        hashingServiceMock.VerifyNoOtherCalls();
    }

    [Test]
    public void DeleteAsync_ThrowsNotFound_WhenUserDoesNotExist()
    {
        var repositoryMock = new Mock<IUserRepository>(MockBehavior.Strict);
        var hashingServiceMock = new Mock<IPasswordHashingService>(MockBehavior.Strict);
        var id = Guid.NewGuid();

        repositoryMock.Setup(x => x.GetByIdAsync(id, It.IsAny<CancellationToken>()))
            .ReturnsAsync((UserEntity?)null);

        var sut = new UserService(repositoryMock.Object, hashingServiceMock.Object);

        Assert.ThrowsAsync<NotFoundException>(() => sut.DeleteAsync(id));
        repositoryMock.VerifyAll();
        hashingServiceMock.VerifyNoOtherCalls();
    }

    [Test]
    public async Task ValidatePasswordAsync_ReturnsResult_WhenUserExists()
    {
        var repositoryMock = new Mock<IUserRepository>(MockBehavior.Strict);
        var hashingServiceMock = new Mock<IPasswordHashingService>(MockBehavior.Strict);
        var id = Guid.NewGuid();
        var user = CreateEntity(id);
        const string password = "AnyPassword!123";

        repositoryMock.Setup(x => x.GetByIdAsync(id, It.IsAny<CancellationToken>()))
            .ReturnsAsync(user);
        hashingServiceMock.Setup(x => x.VerifyPassword(password, user.PasswordHash, user.PasswordSalt))
            .Returns(true);

        var sut = new UserService(repositoryMock.Object, hashingServiceMock.Object);

        var result = await sut.ValidatePasswordAsync(id, password);

        Assert.That(result, Is.True);
        repositoryMock.VerifyAll();
        hashingServiceMock.VerifyAll();
    }

    [Test]
    public void ValidatePasswordAsync_ThrowsNotFound_WhenUserDoesNotExist()
    {
        var repositoryMock = new Mock<IUserRepository>(MockBehavior.Strict);
        var hashingServiceMock = new Mock<IPasswordHashingService>(MockBehavior.Strict);
        var id = Guid.NewGuid();

        repositoryMock.Setup(x => x.GetByIdAsync(id, It.IsAny<CancellationToken>()))
            .ReturnsAsync((UserEntity?)null);

        var sut = new UserService(repositoryMock.Object, hashingServiceMock.Object);

        Assert.ThrowsAsync<NotFoundException>(() => sut.ValidatePasswordAsync(id, "AnyPassword!123"));
        repositoryMock.VerifyAll();
        hashingServiceMock.VerifyNoOtherCalls();
    }

    private static CreateUserDto CreateRequest()
    {
        return new CreateUserDto
        {
            UserName = " new-user ",
            FullName = " New User ",
            Email = " new.user@example.com ",
            MobileNumber = " +38640123456 ",
            Language = " en ",
            Culture = " en-US ",
            Password = "ValidPassword!123"
        };
    }

    private static UpdateUserDto CreateUpdateRequest(string? password)
    {
        return new UpdateUserDto
        {
            UserName = "updated-user",
            FullName = "Updated User",
            Email = "updated.user@example.com",
            MobileNumber = "+38640999888",
            Language = "en",
            Culture = "en-US",
            Password = password
        };
    }

    private static UserEntity CreateEntity(Guid? id = null)
    {
        return new UserEntity
        {
            Id = id ?? Guid.NewGuid(),
            UserName = "existing-user",
            FullName = "Existing User",
            Email = "existing@example.com",
            MobileNumber = "+38640111222",
            Language = "en",
            Culture = "en-US",
            PasswordHash = "hash",
            PasswordSalt = "salt"
        };
    }
}