using System.Net;
using FluentAssertions;
using Xunit;

namespace Examples.Integration.Tests;

/// <summary>
/// Tests that verify multiple microservices can register and receive
/// correctly routed requests through the gateway.
/// </summary>
public sealed class MultiServiceRoutingTests : IClassFixture<GatewayFixture>
{
    private readonly GatewayFixture _fixture;

    public MultiServiceRoutingTests(GatewayFixture fixture)
    {
        _fixture = fixture;
    }

    [Fact]
    public async Task Gateway_RoutesBillingRequests_ToBillingService()
    {
        // Act
        var response = await _fixture.GatewayClient.GetAsync("/invoices/INV-001");

        // Assert
        response.StatusCode.Should().Be(HttpStatusCode.OK);
        var content = await response.Content.ReadAsStringAsync();
        content.Should().Contain("INV-001");
    }

    [Fact]
    public async Task Gateway_RoutesInventoryRequests_ToInventoryService()
    {
        // Act
        var response = await _fixture.GatewayClient.GetAsync("/items/SKU-001");

        // Assert
        response.StatusCode.Should().Be(HttpStatusCode.OK);
        var content = await response.Content.ReadAsStringAsync();
        content.Should().Contain("SKU-001");
    }

    [Fact]
    public async Task Gateway_HandlesSequentialRequestsToDifferentServices()
    {
        // Act - Send requests to both services
        var billingResponse = await _fixture.GatewayClient.GetAsync("/invoices/INV-001");
        var inventoryResponse = await _fixture.GatewayClient.GetAsync("/items/SKU-001");

        // Assert - Both should succeed
        billingResponse.StatusCode.Should().Be(HttpStatusCode.OK);
        inventoryResponse.StatusCode.Should().Be(HttpStatusCode.OK);
    }

    [Fact]
    public async Task Gateway_HandlesConcurrentRequestsToDifferentServices()
    {
        // Act - Send requests to both services concurrently
        var billingTask = _fixture.GatewayClient.GetAsync("/invoices/INV-001");
        var inventoryTask = _fixture.GatewayClient.GetAsync("/items/SKU-001");

        await Task.WhenAll(billingTask, inventoryTask);

        // Assert - Both should succeed
        billingTask.Result.StatusCode.Should().Be(HttpStatusCode.OK);
        inventoryTask.Result.StatusCode.Should().Be(HttpStatusCode.OK);
    }

    [Fact]
    public async Task Gateway_ReturnsNotFound_ForUnknownRoute()
    {
        // Act
        var response = await _fixture.GatewayClient.GetAsync("/unknown/route");

        // Assert
        response.StatusCode.Should().Be(HttpStatusCode.NotFound);
    }
}