using Microsoft.Extensions.Logging.Abstractions;
using Microsoft.Extensions.Options;
using StellaOps.TaskRunner.Core.Execution;
using StellaOps.TaskRunner.Core.Planning;
using StellaOps.TaskRunner.Infrastructure.Execution;
using StellaOps.TaskRunner.Worker.Services;

namespace StellaOps.TaskRunner.Tests;

public sealed class BundleIngestionStepExecutorTests
{
    [Fact]
    public async Task ExecuteAsync_ValidBundle_CopiesAndSucceeds()
    {
        using var temp = new TempDirectory();
        var source = Path.Combine(temp.Path, "bundle.tgz");
        await File.WriteAllTextAsync(source, "bundle-data");
        var checksum = "3e25960a79dbc69b674cd4ec67a72c62b3aa32b1d4d216177a5ffcc6f46673b5"; // sha256 of "bundle-data"

        var options = Options.Create(new PackRunWorkerOptions { ArtifactsPath = temp.Path });
        var executor = new BundleIngestionStepExecutor(options, NullLogger<BundleIngestionStepExecutor>.Instance);

        var step = CreateStep("builtin:bundle.ingest", new Dictionary<string, TaskPackPlanParameterValue>
        {
            ["path"] = Value(source),
            ["checksum"] = Value(checksum)
        });

        var result = await executor.ExecuteAsync(step, step.Parameters, CancellationToken.None);

        Assert.True(result.Succeeded);
        var staged = Path.Combine(temp.Path, "bundles", checksum, "bundle.tgz");
        Assert.True(File.Exists(staged));
        Assert.Equal(await File.ReadAllBytesAsync(source), await File.ReadAllBytesAsync(staged));

        var metadataPath = Path.Combine(temp.Path, "bundles", checksum, "metadata.json");
        Assert.True(File.Exists(metadataPath));
        var metadata = await File.ReadAllTextAsync(metadataPath);
        Assert.Contains(checksum, metadata, StringComparison.OrdinalIgnoreCase);
    }

    [Fact]
    public async Task ExecuteAsync_ChecksumMismatch_Fails()
    {
        using var temp = new TempDirectory();
        var source = Path.Combine(temp.Path, "bundle.tgz");
        await File.WriteAllTextAsync(source, "bundle-data");

        var options = Options.Create(new PackRunWorkerOptions { ArtifactsPath = temp.Path });
        var executor = new BundleIngestionStepExecutor(options, NullLogger<BundleIngestionStepExecutor>.Instance);

        var step = CreateStep("builtin:bundle.ingest", new Dictionary<string, TaskPackPlanParameterValue>
        {
            ["path"] = Value(source),
            ["checksum"] = Value("deadbeef")
        });

        var result = await executor.ExecuteAsync(step, step.Parameters, CancellationToken.None);

        Assert.False(result.Succeeded);
        Assert.Contains("Checksum mismatch", result.Error, StringComparison.OrdinalIgnoreCase);
    }

    [Fact]
    public async Task ExecuteAsync_MissingChecksum_Fails()
    {
        using var temp = new TempDirectory();
        var source = Path.Combine(temp.Path, "bundle.tgz");
        await File.WriteAllTextAsync(source, "bundle-data");

        var options = Options.Create(new PackRunWorkerOptions { ArtifactsPath = temp.Path });
        var executor = new BundleIngestionStepExecutor(options, NullLogger<BundleIngestionStepExecutor>.Instance);

        var step = CreateStep("builtin:bundle.ingest", new Dictionary<string, TaskPackPlanParameterValue>
        {
            ["path"] = Value(source)
        });

        var result = await executor.ExecuteAsync(step, step.Parameters, CancellationToken.None);

        Assert.False(result.Succeeded);
        Assert.Contains("Checksum is required", result.Error, StringComparison.OrdinalIgnoreCase);
    }

    [Fact]
    public async Task ExecuteAsync_UnknownUses_NoOpSuccess()
    {
        var executor = new BundleIngestionStepExecutor(
            Options.Create(new PackRunWorkerOptions { ArtifactsPath = Path.GetTempPath() }),
            NullLogger<BundleIngestionStepExecutor>.Instance);

        var step = CreateStep("builtin:noop", new Dictionary<string, TaskPackPlanParameterValue>());
        var result = await executor.ExecuteAsync(step, step.Parameters, CancellationToken.None);

        Assert.True(result.Succeeded);
    }

    private static TaskPackPlanParameterValue Value(string literal)
        => new(JsonValue.Create(literal), null, null, false);

    private static PackRunExecutionStep CreateStep(string uses, IReadOnlyDictionary<string, TaskPackPlanParameterValue> parameters)
        => new(
            id: "ingest",
            templateId: "ingest",
            kind: PackRunStepKind.Run,
            enabled: true,
            uses: uses,
            parameters: parameters,
            approvalId: null,
            gateMessage: null,
            maxParallel: null,
            continueOnError: false,
            children: PackRunExecutionStep.EmptyChildren);

    private sealed class TempDirectory : IDisposable
    {
        public TempDirectory()
        {
            Path = System.IO.Path.Combine(System.IO.Path.GetTempPath(), Guid.NewGuid().ToString("n"));
            Directory.CreateDirectory(Path);
        }

        public string Path { get; }

        public void Dispose()
        {
            if (Directory.Exists(Path))
            {
                Directory.Delete(Path, recursive: true);
            }
        }
    }
}