using NSubstitute;
using PnvPanel.Application.Admin.Nodes;
using PnvPanel.Application.Common.Interfaces;
using PnvPanel.Application.Common.Models;
using PnvPanel.Application.Tests.TestSupport;
using PnvPanel.Domain.Nodes;
using Xunit;

namespace PnvPanel.Application.Tests.Admin.Nodes;

public class UpdateNodeCommandHandlerTests
{
    private readonly IXuiPanelGateway _gateway = Substitute.For<IXuiPanelGateway>();
    private readonly ISecretProtector _secretProtector = Substitute.For<ISecretProtector>();
    private readonly ICurrentUser _currentUser = Substitute.For<ICurrentUser>();

    private static Node SeedNode(
        string baseAddress = "https://node1.example.com",
        string username = "admin",
        string protectedPassword = "protected-old-password"
    ) => Node.Register("node-1", new Uri(baseAddress), new NodeCredentials(username, protectedPassword), null);

    [Fact]
    public async Task Handle_WhenAddressChanged_ValidatesAndUpdatesAddressAndInvalidatesClient()
    {
        using var dbContext = InMemoryDbContextFactory.Create();
        var node = SeedNode();
        dbContext.Nodes.Add(node);
        await dbContext.SaveChangesAsync(CancellationToken.None);

        _gateway.ValidateBaseAddress(Arg.Any<Uri>()).Returns(Result.Success());

        var handler = new UpdateNodeCommandHandler(dbContext, _gateway, _secretProtector, _currentUser);

        var command = new UpdateNodeCommand(
            node.Id,
            "node-1",
            "https://node1-new.example.com",
            null,
            true,
            false,
            null,
            null
        );

        var result = await handler.Handle(command, CancellationToken.None);

        Assert.True(result.IsSuccess);
        Assert.Equal("https://node1-new.example.com/", node.BaseAddress.ToString());
        _gateway.Received(1).ValidateBaseAddress(Arg.Is<Uri>(u => u!.Host == "node1-new.example.com"));
        _gateway.Received(1).InvalidateClient(node.Id);
    }

    [Fact]
    public async Task Handle_WhenAddressUnchanged_DoesNotValidateOrInvalidateClient()
    {
        using var dbContext = InMemoryDbContextFactory.Create();
        var node = SeedNode();
        dbContext.Nodes.Add(node);
        await dbContext.SaveChangesAsync(CancellationToken.None);

        var handler = new UpdateNodeCommandHandler(dbContext, _gateway, _secretProtector, _currentUser);

        var command = new UpdateNodeCommand(
            node.Id,
            "node-1-renamed",
            "https://node1.example.com",
            "eu",
            true,
            false,
            null,
            null
        );

        var result = await handler.Handle(command, CancellationToken.None);

        Assert.True(result.IsSuccess);
        Assert.Equal("node-1-renamed", node.Name);
        _gateway.DidNotReceive().ValidateBaseAddress(Arg.Any<Uri>());
        _gateway.DidNotReceive().InvalidateClient(Arg.Any<Guid>());
    }

    [Fact]
    public async Task Handle_WithInvalidBaseAddress_ReturnsValidationErrorWithoutChangingNode()
    {
        using var dbContext = InMemoryDbContextFactory.Create();
        var node = SeedNode();
        dbContext.Nodes.Add(node);
        await dbContext.SaveChangesAsync(CancellationToken.None);

        var handler = new UpdateNodeCommandHandler(dbContext, _gateway, _secretProtector, _currentUser);

        var command = new UpdateNodeCommand(node.Id, "node-1", "not-a-uri", null, true, false, null, null);

        var result = await handler.Handle(command, CancellationToken.None);

        Assert.False(result.IsSuccess);
        Assert.Equal(NodeErrors.InvalidBaseAddress, result.Error);
        Assert.Equal("https://node1.example.com/", node.BaseAddress.ToString());
        _gateway.DidNotReceive().ValidateBaseAddress(Arg.Any<Uri>());
    }

    [Fact]
    public async Task Handle_WhenGatewayRejectsNewBaseAddress_ReturnsFailureWithoutChangingNode()
    {
        using var dbContext = InMemoryDbContextFactory.Create();
        var node = SeedNode();
        dbContext.Nodes.Add(node);
        await dbContext.SaveChangesAsync(CancellationToken.None);

        var error = Error.Validation("Nodes.SchemeNotAllowed", "Разрешён только HTTPS.");
        _gateway.ValidateBaseAddress(Arg.Any<Uri>()).Returns(Result.Failure(error));

        var handler = new UpdateNodeCommandHandler(dbContext, _gateway, _secretProtector, _currentUser);

        var command = new UpdateNodeCommand(
            node.Id,
            "node-1",
            "http://node1-new.example.com",
            null,
            true,
            false,
            null,
            null
        );

        var result = await handler.Handle(command, CancellationToken.None);

        Assert.False(result.IsSuccess);
        Assert.Equal(error, result.Error);
        Assert.Equal("https://node1.example.com/", node.BaseAddress.ToString());
        _gateway.DidNotReceive().InvalidateClient(Arg.Any<Guid>());
    }

    [Fact]
    public async Task Handle_WhenUsernameAndPasswordProvided_UpdatesCredentialsAndInvalidatesClient()
    {
        using var dbContext = InMemoryDbContextFactory.Create();
        var node = SeedNode();
        dbContext.Nodes.Add(node);
        await dbContext.SaveChangesAsync(CancellationToken.None);

        _secretProtector.Protect("new-password").Returns("protected-new-password");

        var handler = new UpdateNodeCommandHandler(dbContext, _gateway, _secretProtector, _currentUser);

        var command = new UpdateNodeCommand(
            node.Id,
            "node-1",
            "https://node1.example.com",
            null,
            true,
            false,
            "new-admin",
            "new-password"
        );

        var result = await handler.Handle(command, CancellationToken.None);

        Assert.True(result.IsSuccess);
        Assert.Equal("new-admin", node.Credentials.Username);
        Assert.Equal("protected-new-password", node.Credentials.ProtectedPassword);
        _gateway.Received(1).InvalidateClient(node.Id);
    }

    [Fact]
    public async Task Handle_WhenOnlyUsernameProvided_DoesNotChangeCredentials()
    {
        using var dbContext = InMemoryDbContextFactory.Create();
        var node = SeedNode();
        dbContext.Nodes.Add(node);
        await dbContext.SaveChangesAsync(CancellationToken.None);

        var handler = new UpdateNodeCommandHandler(dbContext, _gateway, _secretProtector, _currentUser);

        var command = new UpdateNodeCommand(
            node.Id,
            "node-1",
            "https://node1.example.com",
            null,
            true,
            false,
            "new-admin",
            null
        );

        var result = await handler.Handle(command, CancellationToken.None);

        Assert.True(result.IsSuccess);
        Assert.Equal("admin", node.Credentials.Username);
        Assert.Equal("protected-old-password", node.Credentials.ProtectedPassword);
        _gateway.DidNotReceive().InvalidateClient(Arg.Any<Guid>());
    }

    [Fact]
    public async Task Handle_SetsNotifyOnStatusChange()
    {
        using var dbContext = InMemoryDbContextFactory.Create();
        var node = SeedNode();
        dbContext.Nodes.Add(node);
        await dbContext.SaveChangesAsync(CancellationToken.None);
        Assert.False(node.NotifyOnStatusChange);

        var handler = new UpdateNodeCommandHandler(dbContext, _gateway, _secretProtector, _currentUser);

        var command = new UpdateNodeCommand(
            node.Id,
            "node-1",
            "https://node1.example.com",
            null,
            true,
            true,
            null,
            null
        );

        var result = await handler.Handle(command, CancellationToken.None);

        Assert.True(result.IsSuccess);
        Assert.True(node.NotifyOnStatusChange);
    }

    [Fact]
    public async Task Handle_WhenNodeNotFound_ReturnsNotFound()
    {
        using var dbContext = InMemoryDbContextFactory.Create();

        var handler = new UpdateNodeCommandHandler(dbContext, _gateway, _secretProtector, _currentUser);

        var command = new UpdateNodeCommand(
            Guid.NewGuid(),
            "node-1",
            "https://node1.example.com",
            null,
            true,
            false,
            null,
            null
        );

        var result = await handler.Handle(command, CancellationToken.None);

        Assert.False(result.IsSuccess);
        Assert.Equal(NodeErrors.NotFound, result.Error);
    }
}