using System.Reflection;
using System.Text.Json;
using HrynCo.NotificationService.DAL.Abstract.Providers;
using HrynCo.NotificationService.Web.Controllers.Admin;
using MediatR;
using Microsoft.AspNetCore.Mvc;

namespace HrynCo.NotificationService.Web.IntegrationTests;

public sealed class AdminSmtpTestControllerTests
{
    private static readonly Guid ChannelId = Guid.NewGuid();

    [Fact]
    public async Task BlankPasswordUsesSavedSecretAndCurrentUnsavedSender()
    {
        var (controller, recorder) = CreateController();
        var response = await controller.TestSmtp(Request(), CancellationToken.None);

        Assert.True(Succeeded(response));
        Assert.Equal("saved-test-secret", recorder.SentCommand?.Password);
        Assert.Equal("changed@example.invalid", recorder.SentCommand?.FromEmail);
        Assert.Equal("Changed sender", recorder.SentCommand?.FromName);
        Assert.Equal(1, recorder.LookupCount);
        Assert.DoesNotContain("saved-test-secret", JsonSerializer.Serialize(((OkObjectResult)response).Value));
    }

    [Fact]
    public async Task ExplicitPasswordOverridesSavedWithoutLookup()
    {
        var (controller, recorder) = CreateController();
        var response = await controller.TestSmtp(Request() with { Password = "typed-test-secret" }, CancellationToken.None);

        Assert.True(Succeeded(response));
        Assert.Equal("typed-test-secret", recorder.SentCommand?.Password);
        Assert.Equal(0, recorder.LookupCount);
    }

    [Theory]
    [InlineData("host")]
    [InlineData("port")]
    [InlineData("username")]
    [InlineData("ssl")]
    public async Task ChangedConnectionRequiresExplicitPassword(string field)
    {
        var (controller, recorder) = CreateController();
        var request = field switch
        {
            "host" => Request() with { Host = "other.example.invalid" },
            "port" => Request() with { Port = 2525 },
            "username" => Request() with { Username = "other-user" },
            _ => Request() with { UseSsl = false }
        };

        var response = await controller.TestSmtp(request, CancellationToken.None);

        Assert.False(Succeeded(response));
        Assert.Null(recorder.SentCommand);
    }

    [Fact]
    public async Task UnknownChannelDoesNotSend()
    {
        var (controller, recorder) = CreateController();
        recorder.Channel = null;

        var response = await controller.TestSmtp(Request(), CancellationToken.None);

        Assert.False(Succeeded(response));
        Assert.Null(recorder.SentCommand);
    }

    [Fact]
    public async Task NewChannelKeepsAdHocTestBehavior()
    {
        var (controller, recorder) = CreateController();

        var response = await controller.TestSmtp(Request() with { ChannelId = null }, CancellationToken.None);

        Assert.True(Succeeded(response));
        Assert.Equal(string.Empty, recorder.SentCommand?.Password);
        Assert.Equal(0, recorder.LookupCount);
    }

    private static (AdminChannelsController Controller, RecordingAdminSmtpMediator Recorder) CreateController()
    {
        var mediator = DispatchProxy.Create<IMediator, RecordingAdminSmtpMediator>();
        var recorder = (RecordingAdminSmtpMediator)mediator;
        recorder.Channel = new EmailChannel
        {
            Id = ChannelId,
            ServiceName = "TestService",
            EmailChannelType = EmailChannelType.Smtp,
            Settings = new SmtpChannelSettings
            {
                Host = "smtp.example.invalid", Port = 587,
                Username = "test-user", Password = "saved-test-secret", UseSsl = true
            }
        };
        return (new AdminChannelsController(mediator), recorder);
    }

    private static TestSmtpRequest Request() => new(
        "smtp.example.invalid", 587, "test-user", "", true,
        "changed@example.invalid", "Changed sender", "recipient@example.invalid", ChannelId);

    private static bool Succeeded(IActionResult response)
    {
        var body = JsonSerializer.Serialize(((OkObjectResult)response).Value);
        return JsonDocument.Parse(body).RootElement.GetProperty("success").GetBoolean();
    }
}