using ErsatzTV.Application.Auth;
using ErsatzTV.Core;
using ErsatzTV.Core.Domain;
using ErsatzTV.Core.Interfaces.Repositories;
using ErsatzTV.Infrastructure.Data.Repositories;
using ErsatzTV.Tests.Support;
using LanguageExt;
using NUnit.Framework;
using Shouldly;

namespace ErsatzTV.Tests.Application.Auth;

[TestFixture]
public class ChangeLocalAdminPasswordHandlerTests
{
    private InMemoryTvContext _db = null!;
    private IConfigElementRepository _configElementRepository = null!;
    private ILocalPasswordHasher _passwordHasher = null!;

    private const string Username = "Operator";
    private const string CurrentPassword = "supersecret";
    private const string NewPassword = "evenbettersecret";

    [SetUp]
    public async Task SetUp()
    {
        _db = await InMemoryTvContext.CreateAsync();
        _configElementRepository = new ConfigElementRepository(_db.Factory);
        _passwordHasher = new LocalPasswordHasher();
    }

    [TearDown]
    public async Task TearDown() => await _db.DisposeAsync();

    private ChangeLocalAdminPasswordHandler MakeHandler() =>
        new(_db.Factory, _passwordHasher);

    private async Task SeedAdmin()
    {
        var claim = new ClaimLocalAdminHandler(_db.Factory, _passwordHasher);
        (await claim.Handle(new ClaimLocalAdmin(Username, CurrentPassword), CancellationToken.None))
            .IsRight.ShouldBeTrue();
    }

    private async Task<string> StoredHash() =>
        (await _configElementRepository.GetValue<string>(
            ConfigElementKey.AuthLocalAdminPasswordHash,
            CancellationToken.None)).IfNone("");

    private async Task<string> StoredStamp() =>
        (await _configElementRepository.GetValue<string>(
            ConfigElementKey.AuthSecurityStamp,
            CancellationToken.None)).IfNone("");

    [Test]
    public async Task Handle_Should_Change_Password_And_Rotate_Stamp_On_Valid_Current_Password()
    {
        await SeedAdmin();
        string originalStamp = await StoredStamp();
        ChangeLocalAdminPasswordHandler handler = MakeHandler();

        Either<BaseError, LocalAdminPrincipal> result = await handler.Handle(
            new ChangeLocalAdminPassword(Username, CurrentPassword, NewPassword),
            CancellationToken.None);

        result.IsRight.ShouldBeTrue();

        string storedHash = await StoredHash();
        _passwordHasher.Verify(storedHash, NewPassword).ShouldNotBe(LocalPasswordVerification.Failed);
        _passwordHasher.Verify(storedHash, CurrentPassword).ShouldBe(LocalPasswordVerification.Failed);

        string newStamp = await StoredStamp();
        newStamp.ShouldNotBe(originalStamp);
        LocalAdminPrincipal principal = result.Match(
            Left: e => throw new ShouldAssertException(e.ToString()),
            Right: p => p);
        principal.SecurityStamp.ShouldBe(newStamp);
    }

    [Test]
    public async Task Handle_Should_Fail_On_Wrong_Current_Password_And_Change_Nothing()
    {
        await SeedAdmin();
        string originalHash = await StoredHash();
        string originalStamp = await StoredStamp();
        ChangeLocalAdminPasswordHandler handler = MakeHandler();

        Either<BaseError, LocalAdminPrincipal> result = await handler.Handle(
            new ChangeLocalAdminPassword(Username, "notthecurrentpassword", NewPassword),
            CancellationToken.None);

        result.IsLeft.ShouldBeTrue();
        (await StoredHash()).ShouldBe(originalHash);
        (await StoredStamp()).ShouldBe(originalStamp);
    }

    [Test]
    public async Task Handle_Should_Reject_Short_New_Password()
    {
        await SeedAdmin();
        string shortPassword = new('a', AuthConstants.MinPasswordLength - 1);
        ChangeLocalAdminPasswordHandler handler = MakeHandler();

        Either<BaseError, LocalAdminPrincipal> result = await handler.Handle(
            new ChangeLocalAdminPassword(Username, CurrentPassword, shortPassword),
            CancellationToken.None);

        result.IsLeft.ShouldBeTrue();
    }

    [Test]
    public async Task Handle_Should_Fail_On_Unconfigured_Db()
    {
        ChangeLocalAdminPasswordHandler handler = MakeHandler();

        Either<BaseError, LocalAdminPrincipal> result = await handler.Handle(
            new ChangeLocalAdminPassword(Username, CurrentPassword, NewPassword),
            CancellationToken.None);

        result.IsLeft.ShouldBeTrue();
    }
}