using EntKube.Provisioning.Domain;
using FluentAssertions;

namespace EntKube.Provisioning.Tests.Domain;

public class IdentityRealmTests
{
    [Fact]
    public void Create_ValidName_ReturnsRealmInProvisioningState()
    {
        // When creating a new realm, it starts in Provisioning status
        // with the given name and cluster association.

        Guid environmentId = Guid.NewGuid();
        Guid clusterId = Guid.NewGuid();

        IdentityRealm realm = IdentityRealm.Create(environmentId, "my-app", clusterId);

        realm.Id.Should().NotBeEmpty();
        realm.EnvironmentId.Should().Be(environmentId);
        realm.ClusterId.Should().Be(clusterId);
        realm.Name.Should().Be("my-app");
        realm.Status.Should().Be(IdentityRealmStatus.Provisioning);
        realm.Branding.Should().Be(RealmBranding.Default);
        realm.Pages.LoginEnabled.Should().BeTrue();
        realm.Pages.ProfileEnabled.Should().BeFalse();
    }

    [Fact]
    public void Create_EmptyName_ThrowsArgumentException()
    {
        // A realm must have a name — empty is not valid.

        Action act = () => IdentityRealm.Create(Guid.NewGuid(), "", Guid.NewGuid());

        act.Should().Throw<ArgumentException>();
    }

    [Fact]
    public void UpdateBranding_ChangesBrandingAndTimestamp()
    {
        // After updating branding, the new values stick and
        // the last modified timestamp is updated.

        IdentityRealm realm = IdentityRealm.Create(Guid.NewGuid(), "branded", Guid.NewGuid());

        RealmBranding newBranding = new(
            LogoUrl: "https://example.com/logo.png",
            BackgroundImageUrl: null,
            BackgroundColor: "#1a1a2e",
            PrimaryColor: "#16213e",
            SecondaryColor: "#0f3460",
            TextColor: "#ffffff");

        realm.UpdateBranding(newBranding);

        realm.Branding.LogoUrl.Should().Be("https://example.com/logo.png");
        realm.Branding.BackgroundColor.Should().Be("#1a1a2e");
        realm.LastModifiedAt.Should().NotBeNull();
    }

    [Fact]
    public void UpdatePages_EnablesProfile()
    {
        // A realm starts with only login enabled. We can enable profile pages too.

        IdentityRealm realm = IdentityRealm.Create(Guid.NewGuid(), "with-profile", Guid.NewGuid());

        RealmPages pages = new(
            LoginEnabled: true,
            ProfileEnabled: true,
            RegistrationEnabled: false,
            ForgotPasswordEnabled: true);

        realm.UpdatePages(pages);

        realm.Pages.ProfileEnabled.Should().BeTrue();
    }

    [Fact]
    public void AddIdentityProvider_NewProvider_AddsToList()
    {
        // Adding an OIDC identity provider to the realm.

        IdentityRealm realm = IdentityRealm.Create(Guid.NewGuid(), "idp-realm", Guid.NewGuid());

        RealmIdentityProvider provider = RealmIdentityProvider.Create(
            alias: "azure-ad",
            displayName: "Azure AD",
            type: IdentityProviderType.Oidc,
            authorizationUrl: "https://login.microsoftonline.com/authorize",
            tokenUrl: "https://login.microsoftonline.com/token",
            clientId: "my-client-id");

        realm.AddIdentityProvider(provider);

        realm.IdentityProviders.Should().HaveCount(1);
        realm.IdentityProviders[0].Alias.Should().Be("azure-ad");
        realm.IdentityProviders[0].Type.Should().Be(IdentityProviderType.Oidc);
    }

    [Fact]
    public void AddIdentityProvider_DuplicateAlias_Throws()
    {
        // Each provider must have a unique alias within the realm.

        IdentityRealm realm = IdentityRealm.Create(Guid.NewGuid(), "dup-realm", Guid.NewGuid());

        RealmIdentityProvider first = RealmIdentityProvider.Create("github", "GitHub", IdentityProviderType.GitHub);
        RealmIdentityProvider duplicate = RealmIdentityProvider.Create("github", "GitHub Copy", IdentityProviderType.GitHub);

        realm.AddIdentityProvider(first);

        Action act = () => realm.AddIdentityProvider(duplicate);

        act.Should().Throw<InvalidOperationException>();
    }

    [Fact]
    public void RemoveIdentityProvider_ExistingAlias_RemovesFromList()
    {
        // Removing an identity provider by alias.

        IdentityRealm realm = IdentityRealm.Create(Guid.NewGuid(), "remove-realm", Guid.NewGuid());

        RealmIdentityProvider provider = RealmIdentityProvider.Create("google", "Google", IdentityProviderType.Google);
        realm.AddIdentityProvider(provider);

        realm.RemoveIdentityProvider("google");

        realm.IdentityProviders.Should().BeEmpty();
    }

    [Fact]
    public void AddOrganization_NewOrg_AddsToList()
    {
        // Organizations let you group users within a realm.

        IdentityRealm realm = IdentityRealm.Create(Guid.NewGuid(), "org-realm", Guid.NewGuid());

        RealmOrganization org = RealmOrganization.Create("Acme Corp", "Top-level org");

        realm.AddOrganization(org);

        realm.Organizations.Should().HaveCount(1);
        realm.Organizations[0].Name.Should().Be("Acme Corp");
    }

    [Fact]
    public void Organization_AddChild_CreatesHierarchy()
    {
        // Organizations support nested children for hierarchical structure.

        RealmOrganization parent = RealmOrganization.Create("Acme Corp");
        RealmOrganization child = RealmOrganization.Create("Engineering");
        RealmOrganization grandchild = RealmOrganization.Create("Backend Team");

        parent.AddChild(child);
        child.AddChild(grandchild);

        parent.Children.Should().HaveCount(1);
        parent.Children[0].Name.Should().Be("Engineering");
        parent.Children[0].Children.Should().HaveCount(1);
        parent.Children[0].Children[0].Name.Should().Be("Backend Team");
    }

    [Fact]
    public void Organization_DuplicateChildName_Throws()
    {
        // Child names must be unique within a parent.

        RealmOrganization parent = RealmOrganization.Create("Acme Corp");
        RealmOrganization child1 = RealmOrganization.Create("Engineering");
        RealmOrganization child2 = RealmOrganization.Create("Engineering");

        parent.AddChild(child1);

        Action act = () => parent.AddChild(child2);

        act.Should().Throw<InvalidOperationException>();
    }

    [Fact]
    public void MarkActive_ChangesStatusToActive()
    {
        IdentityRealm realm = IdentityRealm.Create(Guid.NewGuid(), "active-realm", Guid.NewGuid());

        realm.MarkActive();

        realm.Status.Should().Be(IdentityRealmStatus.Active);
    }
}