using System.Net.Http.Json;
using MeetingAssistant.Calendar;
using MeetingAssistant.MacOs;
using MeetingAssistant.MeetingNotes;
using MeetingAssistant.Screenshots;
using MeetingAssistant.Transcription;
using MeetingAssistant.Workflow;
using Microsoft.AspNetCore.Mvc.Testing;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging.Abstractions;

namespace MeetingAssistant.Tests;

public sealed class MacOsMeetingIntegrationTests
{
    [Fact]
    public void PortableRegistrationUsesRealMacOsProvidersOnlyOnMacOs()
    {
        var macServices = new ServiceCollection().AddLogging();
        var unsupportedServices = new ServiceCollection().AddLogging();

        MacOsMeetingIntegrationRegistration.Add(macServices, isMacOs: true);
        MacOsMeetingIntegrationRegistration.Add(unsupportedServices, isMacOs: false);

        using var macProvider = macServices.BuildServiceProvider();
        using var unsupportedProvider = unsupportedServices.BuildServiceProvider();

        Assert.IsType<MacOsMeetingMetadataProvider>(
            macProvider.GetRequiredService<IMeetingMetadataProvider>());
        Assert.IsType<MacOsCalendarMeetingProvider>(
            macProvider.GetRequiredService<ICalendarMeetingProvider>());
        Assert.IsType<MacOsMeetingStartPromptService>(
            macProvider.GetRequiredService<IMeetingStartPromptService>());
        Assert.IsType<MacOsDesktopIntegrationClient>(
            macProvider.GetRequiredService<IActiveWindowScreenshotCapture>());
        Assert.IsType<MacOsDesktopIntegrationClient>(
            macProvider.GetRequiredService<IScreenshotImageCropper>());

        Assert.IsType<NoopMeetingMetadataProvider>(
            unsupportedProvider.GetRequiredService<IMeetingMetadataProvider>());
        Assert.IsType<NoopCalendarMeetingProvider>(
            unsupportedProvider.GetRequiredService<ICalendarMeetingProvider>());
        Assert.IsType<NoopMeetingStartPromptService>(
            unsupportedProvider.GetRequiredService<IMeetingStartPromptService>());
        Assert.IsType<UnavailableActiveWindowScreenshotCapture>(
            unsupportedProvider.GetRequiredService<IActiveWindowScreenshotCapture>());
        Assert.IsType<UnavailableScreenshotImageCropper>(
            unsupportedProvider.GetRequiredService<IScreenshotImageCropper>());
    }

    [Fact]
    public async Task MacOsCalendarProvidersReturnTeamsMetadataAndPromptCandidate()
    {
        var startedAt = new DateTimeOffset(2026, 7, 25, 10, 5, 0, TimeSpan.FromHours(2));
        var calendarEvent = new MacOsCalendarEvent(
            "event-1",
            "Project sync",
            startedAt.AddMinutes(-5),
            startedAt.AddMinutes(55),
            "Microsoft Teams",
            "Discuss launch readiness.\nJoin Microsoft Teams Meeting",
            "https://teams.microsoft.com/l/meetup-join/example",
            ["Ada Lovelace <ada@example.com>", "Grace Hopper <grace@example.com>"],
            IsCanceled: false);
        var client = new StubMacOsDesktopIntegrationClient(calendarEvent);
        IMeetingMetadataProvider metadataProvider = new MacOsMeetingMetadataProvider(
            client,
            NullLogger<MacOsMeetingMetadataProvider>.Instance);
        ICalendarMeetingProvider calendarProvider = new MacOsCalendarMeetingProvider(
            client,
            NullLogger<MacOsCalendarMeetingProvider>.Instance);

        var metadata = await metadataProvider.GetCurrentMeetingAsync(
            startedAt,
            CancellationToken.None);
        var candidates = await calendarProvider.GetRecordingPromptCandidatesForDayAsync(
            DateOnly.FromDateTime(startedAt.Date),
            CancellationToken.None);

        Assert.NotNull(metadata);
        Assert.Equal("Project sync", metadata.Title);
        Assert.Equal(
            ["Ada Lovelace <ada@example.com>", "Grace Hopper <grace@example.com>"],
            metadata.Attendees);
        Assert.Equal("Discuss launch readiness.", metadata.Agenda);
        Assert.Equal(calendarEvent.End, metadata.ScheduledEnd);

        var candidate = Assert.Single(candidates);
        Assert.Equal("event-1", candidate.Id);
        Assert.Equal("Project sync", candidate.Subject);
        Assert.NotNull(candidate.Metadata);
        Assert.Equal(metadata.Title, candidate.Metadata.Title);
        Assert.Equal(metadata.Attendees, candidate.Metadata.Attendees);
        Assert.Equal(metadata.Agenda, candidate.Metadata.Agenda);
        Assert.Equal(metadata.ScheduledEnd, candidate.Metadata.ScheduledEnd);
    }

    [Fact]
    public async Task MacOsPromptAndScreenshotUseNativeClientResults()
    {
        var screenshot = new ActiveWindowScreenshot([137, 80, 78, 71], "Meeting deck");
        var client = new StubMacOsDesktopIntegrationClient(
            screenshot: screenshot,
            promptResponse: MeetingStartPromptResponse.Record);
        IMeetingStartPromptService prompt = new MacOsMeetingStartPromptService(
            client,
            NullLogger<MacOsMeetingStartPromptService>.Instance);
        IActiveWindowScreenshotCapture capture = client;
        IScreenshotImageCropper cropper = client;
        MeetingStartPromptResponse? callbackResponse = null;
        var request = new MeetingStartPromptRequest(new CalendarMeeting(
            "event-1",
            "Project sync",
            DateTimeOffset.Now,
            DateTimeOffset.Now.AddHours(1)));

        await prompt.ShowPromptAsync(
            request,
            (response, _) =>
            {
                callbackResponse = response;
                return Task.CompletedTask;
            },
            CancellationToken.None);
        var captured = await capture.CaptureAsync(CancellationToken.None);
        var croppedPath = await cropper.SaveCroppedScreenshotAsync(
            "meeting.png",
            new ScreenshotCropCoordinates(1, 2, 3, 4),
            CancellationToken.None);

        Assert.Equal(MeetingStartPromptResponse.Record, callbackResponse);
        Assert.Equal(screenshot, captured);
        Assert.Equal("meeting.png.cropped.png", croppedPath);
    }

    [Fact]
    public async Task MacOsCapabilityEndpointReportsEnabledRealProviders()
    {
        if (!OperatingSystem.IsMacOS())
        {
            return;
        }

        await using var factory = new WebApplicationFactory<Program>();
        using var client = factory.CreateClient();

        var report = await client.GetFromJsonAsync<PlatformCapabilityReport>(
            "/diagnostics/platform-capabilities");

        Assert.NotNull(report);
        Assert.Equal("macOS", report.Host);
        Assert.Equal(nameof(MacOsMeetingMetadataProvider), report.MeetingMetadataProvider);
        Assert.Equal(nameof(MacOsCalendarMeetingProvider), report.CalendarMeetingProvider);
        Assert.Equal(nameof(MacOsMeetingStartPromptService), report.MeetingStartPromptProvider);
        Assert.Equal(nameof(MacOsDesktopIntegrationClient), report.ScreenshotProvider);
        Assert.Equal(nameof(MacOsWorkflowRulesEditorWindowService), report.WorkflowEditorProvider);
        Assert.True(report.WorkflowEditorAvailable);
        Assert.True(report.CalendarRecordingPromptsEnabled);
        Assert.True(report.SpeakerIdentificationEnabled);
        Assert.True(report.ScreenshotOcrEnabled);
        Assert.True(report.FunAsrBackendEnabled);
        Assert.True(report.FunAsrDiarizationEnabled);
        Assert.True(report.WhisperLocalDiarizationEnabled);
    }

    [Fact]
    public async Task NativeHelperAdvertisesCalendarPromptAndScreenshotFeatures()
    {
        if (!OperatingSystem.IsMacOS())
        {
            return;
        }

        var runner = new ProcessCommandRunner(
            NullLogger<ProcessCommandRunner>.Instance);

        var result = await runner.RunAsync(
            GetNativeHelperPath(),
            ["self-test"],
            CancellationToken.None);

        Assert.Equal(0, result.ExitCode);
        using var json = System.Text.Json.JsonDocument.Parse(result.StandardOutput);
        Assert.Equal("ok", json.RootElement.GetProperty("status").GetString());
        Assert.Equal(
            ["calendar", "prompt", "screenshot", "crop"],
            json.RootElement.GetProperty("features")
                .EnumerateArray()
                .Select(feature => feature.GetString()!)
                .ToArray());
    }

    [Fact]
    public async Task NativeHelperCropsPngUsingOcrPixelCoordinates()
    {
        if (!OperatingSystem.IsMacOS())
        {
            return;
        }

        var testRoot = Path.Combine(
            Path.GetTempPath(),
            $"meeting-assistant-native-crop-{Guid.NewGuid():N}");
        Directory.CreateDirectory(testRoot);
        var bitmapPath = Path.Combine(testRoot, "input.bmp");
        var inputPath = Path.Combine(testRoot, "input.png");
        var outputPath = Path.Combine(testRoot, "output.png");
        var outputBitmapPath = Path.Combine(testRoot, "output.bmp");
        try
        {
            await File.WriteAllBytesAsync(
                bitmapPath,
                CreateTopRedBottomBlueBitmap());
            var runner = new ProcessCommandRunner(
                NullLogger<ProcessCommandRunner>.Instance);
            var inputConversion = await runner.RunAsync(
                "/usr/bin/sips",
                ["-s", "format", "png", bitmapPath, "--out", inputPath],
                CancellationToken.None);
            Assert.Equal(0, inputConversion.ExitCode);

            var result = await runner.RunAsync(
                GetNativeHelperPath(),
                ["crop", inputPath, outputPath, "0", "0", "2", "1"],
                CancellationToken.None);

            Assert.Equal(0, result.ExitCode);
            var png = await File.ReadAllBytesAsync(outputPath);
            Assert.Equal((2, 1), PngTestFixture.ReadDimensions(png));
            var outputConversion = await runner.RunAsync(
                "/usr/bin/sips",
                ["-s", "format", "bmp", outputPath, "--out", outputBitmapPath],
                CancellationToken.None);
            Assert.Equal(0, outputConversion.ExitCode);
            Assert.Equal(
                (Red: (byte)255, Green: (byte)0, Blue: (byte)0),
                ReadFirstBitmapPixel(await File.ReadAllBytesAsync(outputBitmapPath)));
        }
        finally
        {
            Directory.Delete(testRoot, recursive: true);
        }
    }

    [Fact]
    public async Task CalendarProviderUsesActualLocalMidnightsAcrossDaylightSavingTransition()
    {
        if (TimeZoneInfo.Local.Id != "Europe/Berlin")
        {
            return;
        }

        var client = new StubMacOsDesktopIntegrationClient();
        var provider = new MacOsCalendarMeetingProvider(
            client,
            NullLogger<MacOsCalendarMeetingProvider>.Instance);

        await provider.GetRecordingPromptCandidatesForDayAsync(
            new DateOnly(2026, 3, 29),
            CancellationToken.None);

        Assert.Equal(
            DateTimeOffset.Parse("2026-03-29T00:00:00+01:00"),
            client.CalendarFrom);
        Assert.Equal(
            DateTimeOffset.Parse("2026-03-30T00:00:00+02:00"),
            client.CalendarTo);
        Assert.Equal(TimeSpan.FromHours(23), client.CalendarTo - client.CalendarFrom);
    }

    [Fact]
    public async Task CalendarClientFallsBackToCalendarAutomationWhenEventKitIsDenied()
    {
        if (!OperatingSystem.IsMacOS())
        {
            return;
        }

        var runner = new SequenceCommandRunner(
            new CommandResult(
                MacOsIntegrationException.CalendarPermissionDeniedExitCode,
                "",
                "Calendar Full Access permission is required."),
            new CommandResult(
                0,
                """
                [{"id":"fallback-event","subject":"Project sync","start":"2026-07-25T08:00:00Z","end":"2026-07-25T09:00:00Z","location":"Microsoft Teams","notes":"","url":"https://teams.microsoft.com/example","attendees":[],"isCanceled":false}]
                """,
                ""));
        IMacOsCalendarClient client = new MacOsDesktopIntegrationClient(
            runner,
            Path.GetDirectoryName(GetNativeHelperPath())!);

        var events = await client.GetCalendarEventsAsync(
            DateTimeOffset.Parse("2026-07-25T00:00:00Z"),
            DateTimeOffset.Parse("2026-07-26T00:00:00Z"),
            CancellationToken.None);

        var calendarEvent = Assert.Single(events);
        Assert.Equal("fallback-event", calendarEvent.Id);
        Assert.Collection(
            runner.Commands,
            command => Assert.Equal("calendar", command.Arguments[0]),
            command =>
            {
                Assert.Equal("/usr/bin/osascript", command.FileName);
                Assert.Equal(["-l", "JavaScript"], command.Arguments.Take(2));
            });
    }

    private static string GetNativeHelperPath()
    {
        var configuration = new DirectoryInfo(AppContext.BaseDirectory)
            .Parent?.Name ?? "Debug";
        return Path.GetFullPath(Path.Combine(
            AppContext.BaseDirectory,
            "..",
            "..",
            "..",
            "..",
            "MeetingAssistant",
            "bin",
            configuration,
            "net10.0",
            "Native",
            "macos-meeting-integrations"));
    }

    private static byte[] CreateTopRedBottomBlueBitmap()
    {
        var bitmap = new byte[70];
        bitmap[0] = (byte)'B';
        bitmap[1] = (byte)'M';
        BitConverter.GetBytes(bitmap.Length).CopyTo(bitmap, 2);
        BitConverter.GetBytes(54).CopyTo(bitmap, 10);
        BitConverter.GetBytes(40).CopyTo(bitmap, 14);
        BitConverter.GetBytes(2).CopyTo(bitmap, 18);
        BitConverter.GetBytes(2).CopyTo(bitmap, 22);
        BitConverter.GetBytes((short)1).CopyTo(bitmap, 26);
        BitConverter.GetBytes((short)24).CopyTo(bitmap, 28);
        BitConverter.GetBytes(16).CopyTo(bitmap, 34);

        // BMP rows are bottom-up and padded to four-byte boundaries.
        bitmap[54] = 255;
        bitmap[57] = 255;
        bitmap[64] = 255;
        bitmap[67] = 255;
        return bitmap;
    }

    private static (byte Red, byte Green, byte Blue) ReadFirstBitmapPixel(byte[] bitmap)
    {
        var pixelOffset = BitConverter.ToInt32(bitmap, 10);
        return (
            Red: bitmap[pixelOffset + 2],
            Green: bitmap[pixelOffset + 1],
            Blue: bitmap[pixelOffset]);
    }

    private sealed class StubMacOsDesktopIntegrationClient :
        IMacOsCalendarClient,
        IMacOsMeetingPromptClient,
        IActiveWindowScreenshotCapture,
        IScreenshotImageCropper
    {
        private readonly IReadOnlyList<MacOsCalendarEvent> events;
        private readonly ActiveWindowScreenshot screenshot;
        private readonly MeetingStartPromptResponse promptResponse;

        public StubMacOsDesktopIntegrationClient(
            MacOsCalendarEvent? calendarEvent = null,
            ActiveWindowScreenshot? screenshot = null,
            MeetingStartPromptResponse promptResponse = MeetingStartPromptResponse.Skip)
        {
            events = calendarEvent is null ? [] : [calendarEvent];
            this.screenshot = screenshot ?? new ActiveWindowScreenshot([], null);
            this.promptResponse = promptResponse;
        }

        public Task<IReadOnlyList<MacOsCalendarEvent>> GetCalendarEventsAsync(
            DateTimeOffset from,
            DateTimeOffset to,
            CancellationToken cancellationToken)
        {
            CalendarFrom = from;
            CalendarTo = to;
            return Task.FromResult(events);
        }

        public DateTimeOffset CalendarFrom { get; private set; }

        public DateTimeOffset CalendarTo { get; private set; }

        public Task<MeetingStartPromptResponse> ShowMeetingStartPromptAsync(
            MeetingStartPromptRequest request,
            CancellationToken cancellationToken)
        {
            return Task.FromResult(promptResponse);
        }

        public Task<ActiveWindowScreenshot> CaptureAsync(CancellationToken cancellationToken)
        {
            return Task.FromResult(screenshot);
        }

        public Task<string?> SaveCroppedScreenshotAsync(
            string screenshotPath,
            ScreenshotCropCoordinates crop,
            CancellationToken cancellationToken)
        {
            return Task.FromResult<string?>($"{screenshotPath}.cropped.png");
        }
    }

    private sealed class SequenceCommandRunner : ICommandRunner
    {
        private readonly Queue<CommandResult> results;

        public SequenceCommandRunner(params CommandResult[] results)
        {
            this.results = new Queue<CommandResult>(results);
        }

        public List<(string FileName, IReadOnlyList<string> Arguments)> Commands { get; } = [];

        public Task<CommandResult> RunAsync(
            string fileName,
            IReadOnlyList<string> arguments,
            CancellationToken cancellationToken,
            IReadOnlyDictionary<string, string>? environment = null)
        {
            Commands.Add((fileName, arguments));
            return Task.FromResult(results.Dequeue());
        }
    }
}