using System.Security.Cryptography;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc.Testing;
using Microsoft.AspNetCore.TestHost;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using SIGCM2.Application.Abstractions.Security;
using SIGCM2.Infrastructure.Persistence;
using SIGCM2.Infrastructure.Security;
using Xunit;

namespace SIGCM2.TestSupport;

/// <summary>
/// WebApplicationFactory for integration tests against SIGCM2.Api.
/// Uses SIGCM2_Test_Api database (isolated from Application.Tests which uses SIGCM2_Test_App).
/// </summary>
public sealed class TestWebAppFactory : WebApplicationFactory<Program>, IAsyncLifetime
{
    private const string TestConnectionString = TestConnectionStrings.ApiTestDb;

    // Resolved once — absolute paths independent of working directory
    private static readonly string RepoRoot = ResolveRepoRoot();
    private static readonly string PrivateKeyPath = Path.Combine(RepoRoot, "src", "api", "SIGCM2.Api", "keys", "private.pem");
    private static readonly string PublicKeyPath = Path.Combine(RepoRoot, "src", "api", "SIGCM2.Api", "keys", "public.pem");

    private readonly SqlTestFixture _dbFixture = new(TestConnectionString);

    protected override void ConfigureWebHost(IWebHostBuilder builder)
    {
        // Step 1: Override configuration BEFORE services are built
        builder.ConfigureAppConfiguration((ctx, config) =>
        {
            // Clear all existing sources and rebuild with test values
            // This ensures our paths win over appsettings.json
            config.AddInMemoryCollection(new Dictionary<string, string?>
            {
                ["ConnectionStrings:SqlServer"] = TestConnectionString,
                ["Jwt:Issuer"] = "sigcm2.api",
                ["Jwt:Audience"] = "sigcm2.web",
                ["Jwt:AccessTokenMinutes"] = "60",
                ["Jwt:RefreshTokenDays"] = "7",
                ["Jwt:PrivateKeyPath"] = PrivateKeyPath,
                ["Jwt:PublicKeyPath"] = PublicKeyPath,
                ["Jwt:PrivateKey"] = null,
                ["Jwt:PublicKey"] = null,
                ["Cors:AllowedOrigins:0"] = "http://localhost:5173",
                ["Serilog:MinimumLevel:Default"] = "Warning",
            });
        });

        builder.UseEnvironment("Testing");

        // Step 2: Replace SqlConnectionFactory singleton with the correct test connection.
        // ConfigureAppConfiguration alone is insufficient because WebApplication.CreateBuilder
        // evaluates configuration for singleton construction before overrides apply.
        // ConfigureTestServices runs AFTER all services are registered, so it wins.
        builder.ConfigureTestServices(services =>
        {
            // Remove the existing SqlConnectionFactory singleton registered by AddInfrastructure
            var descriptor = services.SingleOrDefault(
                d => d.ServiceType == typeof(SqlConnectionFactory));
            if (descriptor is not null)
                services.Remove(descriptor);

            // Re-register with the test connection string
            services.AddSingleton(new SqlConnectionFactory(TestConnectionString));
        });
    }

    public async Task InitializeAsync()
    {
        await _dbFixture.InitializeAsync();
    }

    public new async Task DisposeAsync()
    {
        await _dbFixture.DisposeAsync();
        await base.DisposeAsync();
    }

    private static string ResolveRepoRoot()
    {
        // Walk up from AppContext.BaseDirectory looking for SIGCM2.slnx
        var dir = new DirectoryInfo(AppContext.BaseDirectory);
        while (dir is not null)
        {
            if (dir.GetFiles("SIGCM2.slnx").Length > 0)
                return dir.FullName;
            dir = dir.Parent;
        }

        // Walk up from assembly location
        var assemblyLocation = typeof(TestWebAppFactory).Assembly.Location;
        dir = new DirectoryInfo(Path.GetDirectoryName(assemblyLocation)!);
        while (dir is not null)
        {
            if (dir.GetFiles("SIGCM2.slnx").Length > 0)
                return dir.FullName;
            dir = dir.Parent;
        }

        // Known absolute path (last resort for this machine)
        const string knownPath = @"E:\SIG-CM2.0";
        if (Directory.Exists(knownPath) && File.Exists(Path.Combine(knownPath, "SIGCM2.slnx")))
            return knownPath;

        throw new InvalidOperationException(
            $"Could not find repo root containing SIGCM2.slnx. " +
            $"AppContext.BaseDirectory: {AppContext.BaseDirectory}");
    }
}
