using System.Net;
using System.Net.Http.Json;
using ItWorx.KnowledgeHub.Contracts.Admin;
using ItWorx.KnowledgeHub.Contracts.Auth;
using ItWorx.KnowledgeHub.IntegrationTests.Infrastructure;

namespace ItWorx.KnowledgeHub.IntegrationTests.Authorization;

[Collection(PostgresTestGroup.Name)]
public sealed class RoleAuthorizationTests(PostgresContainerFixture postgres) : OwnerSetupTestBase(postgres)
{
    [Fact]
    public async Task Unauthenticated_requests_to_admin_endpoints_are_rejected()
    {
        using var client = Factory.CreateClient();

        using var response = await client.GetAsync("/api/v1/admin/users");

        Assert.Equal(HttpStatusCode.Unauthorized, response.StatusCode);
    }

    [Fact]
    public async Task Reader_role_cannot_reach_administrator_only_endpoints()
    {
        using var adminClient = Factory.CreateClient();
        await SetupHelper.LoginAsync(adminClient, OwnerEmail, OwnerPassword);

        const string readerEmail = "lezer@itworx.test";
        const string readerPassword = "reader-strong-password";
        await CreateUserAsync(adminClient, readerEmail, readerPassword, "Reader");

        using var readerClient = Factory.CreateClient();
        await SetupHelper.LoginAsync(readerClient, readerEmail, readerPassword);

        using var response = await readerClient.GetAsync("/api/v1/admin/users");

        Assert.Equal(HttpStatusCode.Forbidden, response.StatusCode);
    }

    [Fact]
    public async Task Editor_role_cannot_reach_administrator_only_endpoints()
    {
        using var adminClient = Factory.CreateClient();
        await SetupHelper.LoginAsync(adminClient, OwnerEmail, OwnerPassword);

        const string editorEmail = "redacteur@itworx.test";
        const string editorPassword = "editor-strong-password";
        await CreateUserAsync(adminClient, editorEmail, editorPassword, "Editor");

        using var editorClient = Factory.CreateClient();
        await SetupHelper.LoginAsync(editorClient, editorEmail, editorPassword);

        using var response = await editorClient.GetAsync("/api/v1/admin/users");

        Assert.Equal(HttpStatusCode.Forbidden, response.StatusCode);
    }

    [Fact]
    public async Task Administrator_role_can_reach_administrator_only_endpoints()
    {
        using var adminClient = Factory.CreateClient();
        await SetupHelper.LoginAsync(adminClient, OwnerEmail, OwnerPassword);

        using var response = await adminClient.GetAsync("/api/v1/admin/users");

        Assert.Equal(HttpStatusCode.OK, response.StatusCode);
    }

    [Fact]
    public async Task Disabling_a_user_immediately_invalidates_their_existing_session_not_only_future_logins()
    {
        using var adminClient = Factory.CreateClient();
        await SetupHelper.LoginAsync(adminClient, OwnerEmail, OwnerPassword);

        const string email = "tijdelijk@itworx.test";
        const string password = "public-fixture";
        var created = await CreateUserAsync(adminClient, email, password, "Editor");

        using var targetClient = Factory.CreateClient();
        await SetupHelper.LoginAsync(targetClient, email, password);

        var whileEnabled = await targetClient.GetAsync("/api/v1/auth/session");
        Assert.Equal(HttpStatusCode.OK, whileEnabled.StatusCode);

        var disableResponse = await SetupHelper.PatchWithCsrfAsync(
            adminClient,
            $"/api/v1/admin/users/{created.Id}",
            new UpdateUserRequest(Role: null, Enabled: false));
        Assert.Equal(HttpStatusCode.OK, disableResponse.StatusCode);

        // The already-issued session cookie must stop working immediately — this is
        // checked on the very next request, not after any polling delay, because the
        // security-stamp validation happens on every request (ValidationInterval =
        // TimeSpan.Zero).
        var afterDisable = await targetClient.GetFromJsonAsync<SessionResponse>("/api/v1/auth/session");
        Assert.NotNull(afterDisable);
        Assert.False(afterDisable.Authenticated);
    }

    [Fact]
    public async Task Administrator_cannot_demote_the_last_enabled_administrator()
    {
        using var adminClient = Factory.CreateClient();
        await SetupHelper.LoginAsync(adminClient, OwnerEmail, OwnerPassword);

        var session = await adminClient.GetFromJsonAsync<SessionResponse>("/api/v1/auth/session");
        Assert.NotNull(session);

        var response = await SetupHelper.PatchWithCsrfAsync(
            adminClient,
            $"/api/v1/admin/users/{session.UserId}",
            new UpdateUserRequest(Role: "Reader", Enabled: null));

        Assert.Equal(HttpStatusCode.Conflict, response.StatusCode);
    }

    private static async Task<UserSummaryResponse> CreateUserAsync(
        HttpClient adminClient,
        string email,
        string password,
        string role)
    {
        var response = await SetupHelper.PostWithCsrfAsync(
            adminClient,
            "/api/v1/admin/users",
            new CreateUserRequest($"Test {role}", email, password, role));

        Assert.Equal(HttpStatusCode.OK, response.StatusCode);

        var payload = await response.Content.ReadFromJsonAsync<UserSummaryResponse>();
        Assert.NotNull(payload);
        return payload;
    }
}