// Tenant isolation test harness for DEVOPS-TEN-47-001/48-001
// Tests multi-tenant boundary enforcement across Authority module

using System.Net;
using System.Net.Http.Headers;
using Microsoft.AspNetCore.Mvc.Testing;
using Xunit;

namespace StellaOps.Authority.Tests.TenantIsolation;

/// <summary>
/// Test harness for verifying tenant isolation boundaries.
/// Covers DEVOPS-TEN-47-001 (tenant provisioning) and DEVOPS-TEN-48-001 (tenant partition).
/// </summary>
public class TenantIsolationHarness
{
    private const string TenantHeader = "X-StellaOps-Tenant";

    /// <summary>
    /// Tenant A cannot access Tenant B's resources.
    /// </summary>
    [Fact]
    public async Task CrossTenantAccess_ShouldBeDenied()
    {
        // Arrange
        var tenantA = "tenant-alpha";
        var tenantB = "tenant-beta";

        // This would use WebApplicationFactory in real tests
        // var client = factory.CreateClient();

        // Act - Tenant A tries to access Tenant B's data
        // var request = new HttpRequestMessage(HttpMethod.Get, "/api/v1/findings");
        // request.Headers.Add(TenantHeader, tenantA);
        // request.Headers.Add("X-Requested-Tenant", tenantB); // Attempted cross-tenant

        // Assert
        // response.StatusCode.Should().Be(HttpStatusCode.Forbidden);
        Assert.True(true, "Placeholder - implement with WebApplicationFactory");
    }

    /// <summary>
    /// Default tenant header must be present for multi-tenant endpoints.
    /// </summary>
    [Fact]
    public async Task MissingTenantHeader_ShouldReturnBadRequest()
    {
        // Arrange - request without tenant header

        // Act
        // var response = await client.GetAsync("/api/v1/findings");

        // Assert
        // response.StatusCode.Should().Be(HttpStatusCode.BadRequest);
        Assert.True(true, "Placeholder - implement with WebApplicationFactory");
    }

    /// <summary>
    /// Tenant-scoped tokens cannot access other tenants.
    /// </summary>
    [Fact]
    public async Task TenantScopedToken_CannotCrossBoundary()
    {
        // Arrange
        var tenantAToken = "eyJ..."; // Token scoped to tenant-alpha

        // Act - Use tenant-alpha token to access tenant-beta
        // var request = new HttpRequestMessage(HttpMethod.Get, "/api/v1/scans");
        // request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", tenantAToken);
        // request.Headers.Add(TenantHeader, "tenant-beta");

        // Assert - Should fail due to token/header mismatch
        // response.StatusCode.Should().Be(HttpStatusCode.Forbidden);
        Assert.True(true, "Placeholder - implement with WebApplicationFactory");
    }

    /// <summary>
    /// System tenant can access all tenants (admin scope).
    /// </summary>
    [Fact]
    public async Task SystemTenant_CanAccessAllTenants()
    {
        // Arrange
        var systemToken = "eyJ..."; // Token with system:admin scope

        // Act - System admin accessing tenant data
        // var request = new HttpRequestMessage(HttpMethod.Get, "/api/v1/admin/tenants/tenant-alpha/findings");
        // request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", systemToken);

        // Assert
        // response.StatusCode.Should().Be(HttpStatusCode.OK);
        Assert.True(true, "Placeholder - implement with WebApplicationFactory");
    }

    /// <summary>
    /// Tenant data is partitioned in database queries.
    /// </summary>
    [Fact]
    public async Task DatabaseQueries_ArePartitionedByTenant()
    {
        // Arrange - Create findings in both tenants

        // Act - Query findings for tenant-alpha
        // var request = new HttpRequestMessage(HttpMethod.Get, "/api/v1/findings");
        // request.Headers.Add(TenantHeader, "tenant-alpha");
        // var response = await client.SendAsync(request);
        // var findings = await response.Content.ReadFromJsonAsync<FindingsResponse>();

        // Assert - Should only return tenant-alpha findings
        // findings.Items.Should().AllSatisfy(f => f.TenantId.Should().Be("tenant-alpha"));
        Assert.True(true, "Placeholder - implement with WebApplicationFactory");
    }

    /// <summary>
    /// Tenant provisioning creates isolated schema/partition.
    /// </summary>
    [Fact]
    public async Task TenantProvisioning_CreatesIsolatedPartition()
    {
        // Arrange
        var newTenant = new { Id = "tenant-gamma", Name = "Gamma Corp" };

        // Act - Provision new tenant
        // var response = await client.PostAsJsonAsync("/api/v1/admin/tenants", newTenant);

        // Assert - Tenant should be created with isolated storage
        // response.StatusCode.Should().Be(HttpStatusCode.Created);
        Assert.True(true, "Placeholder - implement with WebApplicationFactory");
    }
}

/// <summary>
/// Fixture providing tenant-aware test context.
/// </summary>
public class TenantTestFixture : IAsyncLifetime
{
    public string TenantAlphaId { get; } = "tenant-alpha";
    public string TenantBetaId { get; } = "tenant-beta";
    public string SystemTenantId { get; } = "system";

    public Task InitializeAsync()
    {
        // Setup test tenants in database
        return Task.CompletedTask;
    }

    public Task DisposeAsync()
    {
        // Cleanup test tenants
        return Task.CompletedTask;
    }
}