using System.Reflection;
using FluentAssertions;
using foodmarket.Api.Background;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Logging.Abstractions;
using Xunit;

namespace foodmarket.UnitTests;

/// <summary>Sprint 28: lock-down тест для регекса <see cref="ApiReferenceDocsJob"/>.
/// До Sprint 28 регекс return-type'a матчил только 1-level generic, поэтому
/// контроллер с <c>Task&lt;ActionResult&lt;PagedResult&lt;Dto&gt;&gt;&gt;</c> терял endpoint'ы.
/// Этот тест ловит регрессию через scan in-memory C# source-кода и проверку
/// что нужные endpoint'ы найдены.</summary>
public class ApiReferenceDocsJobTests
{
    /// <summary>Tiny test-only env для GenerateAsync. Возвращает временный
    /// каталог как ContentRoot — внутри которого мы кладём наши тестовые
    /// Controllers/.</summary>
    private sealed class TestEnv : IWebHostEnvironment
    {
        public string EnvironmentName { get; set; } = "Test";
        public string ApplicationName { get; set; } = "Test";
        public string ContentRootPath { get; set; } = string.Empty;
        public string WebRootPath { get; set; } = string.Empty;
        public Microsoft.Extensions.FileProviders.IFileProvider WebRootFileProvider { get; set; } = null!;
        public Microsoft.Extensions.FileProviders.IFileProvider ContentRootFileProvider { get; set; } = null!;
    }

    private const string DoubleNestedController = @"
using Microsoft.AspNetCore.Mvc;

namespace foodmarket.Api.Controllers.Catalog;

[Route(""api/test"")]
public class TestController : ControllerBase
{
    [HttpGet]
    public async Task<ActionResult<PagedResult<EmployeeDto>>> List() => Ok(null);

    [HttpPost(""create""), RequiresPermission(""TestEdit"")]
    public async Task<ActionResult<EmployeeDto>> Create() => Ok(null);

    [HttpDelete(""{id:guid}"")]
    public async Task<IActionResult> Delete(Guid id) => NoContent();
}
";

    [Fact]
    public async Task Scans_endpoints_with_doubly_nested_generic_return()
    {
        var tmp = Directory.CreateTempSubdirectory("api-ref-test-");
        try
        {
            var ctrlDir = Path.Combine(tmp.FullName, "Controllers");
            Directory.CreateDirectory(ctrlDir);
            await File.WriteAllTextAsync(Path.Combine(ctrlDir, "TestController.cs"), DoubleNestedController);

            var env = new TestEnv { ContentRootPath = tmp.FullName };
            var job = new ApiReferenceDocsJob(env, NullLogger<ApiReferenceDocsJob>.Instance);

            var count = await job.GenerateAsync();
            count.Should().Be(3, "three endpoints: GET / POST create / DELETE {id}");

            // Проверяем, что output-файл содержит все три route'а.
            var outFile = Path.Combine(tmp.FullName, "api-reference-generated.md");
            File.Exists(outFile).Should().BeTrue();
            var content = await File.ReadAllTextAsync(outFile);
            content.Should().Contain("/api/test/create");
            content.Should().Contain("/api/test/{id:guid}");
            // base-route — fallback на просто "GET /api/test".
            content.Should().Contain("/api/test");
            // RequiresPermission('TestEdit') должен попасть в Permission колонку.
            content.Should().Contain("TestEdit");
        }
        finally
        {
            Directory.Delete(tmp.FullName, recursive: true);
        }
    }
}