using System.Collections.ObjectModel;

using Microsoft.Extensions.Logging;

using CommunityToolkit.Mvvm.ComponentModel;

using Avalonia;
using Avalonia.Threading;

using SkiaSharp;

using LiveChartsCore.SkiaSharpView;
using LiveChartsCore.SkiaSharpView.Painting;
using LiveChartsCore.Defaults;

using GSS2.Core.Hardware;

namespace GSS2.UI.Core.ViewModels;

public partial class ResourcesViewModel : ViewModelBase, IDisposable
{
    private bool _disposedValue;

    private readonly ComputeResourcesService _computeResourcesService;
    private readonly ILogger<ResourcesViewModel> _logger;
    private readonly int _intervalMs = 500;
    private readonly int _chartsHistorySize = 120;
    private readonly System.Timers.Timer _updateTimer;

    [ObservableProperty] private Rect _bounds;
    [ObservableProperty] private bool _isChartsColumnVisible;
    [ObservableProperty] private bool _isBarsColumnVisible;
    [ObservableProperty] private ResourceChartViewModel _cpuUsageChartViewModel;
    [ObservableProperty] private ResourceChartViewModel _cpuTemperatureChartViewModel;
    [ObservableProperty] private ResourceChartViewModel _memoryUsageChartViewModel;
    [ObservableProperty] private ResourceCpuUsageBarsViewModel _cpuUsageBarsViewModel;
    [ObservableProperty] private ResourceBarViewModel _cpuTemperatureBarViewModel;
    [ObservableProperty] private ResourceBarViewModel _memoryUsageBarViewModel;

    public ResourcesViewModel(
        ILogger<ResourcesViewModel> logger,
        ILogger<ResourceCpuUsageBarsViewModel> resourceCpuUsageBarsViewModelLogger,
        ILogger<ResourceChartViewModel> resourceChartViewModelCpuUsageLogger,
        ILogger<ResourceChartViewModel> resourceChartViewModelCpuTemperatureLogger,
        ILogger<ResourceChartViewModel> resourceChartViewModelMemoryUsageLogger,
        ILogger<ResourceBarViewModel> resourceBarViewModelCpuUsageLogger,
        ILogger<ResourceBarViewModel> resourceBarViewModelCpu0UsageLogger,
        ILogger<ResourceBarViewModel> resourceBarViewModelCpu1UsageLogger,
        ILogger<ResourceBarViewModel> resourceBarViewModelCpu2UsageLogger,
        ILogger<ResourceBarViewModel> resourceBarViewModelCpu3UsageLogger,
        ILogger<ResourceBarViewModel> resourceBarViewModelCpuTemperatureLogger,
        ILogger<ResourceBarViewModel> resourceBarViewModelMemoryUsageLogger,
        ComputeResourcesService computeResourcesService
    )
    {
        _logger = logger;
        _logger.LogInformation("Initialization");

        _computeResourcesService = computeResourcesService;

        ResourceChartViewModel CreateChartViewModel(ILogger<ResourceChartViewModel> logger, string name, double minLimit, double maxLimit, double minStep)
        {
            return new ResourceChartViewModel(
                logger: logger,
                series:
                [
                    new LineSeries<double>
                    {
                        Name = name,
                        Values = new ObservableCollection<double>(Enumerable.Repeat(0.0, _chartsHistorySize)),
                        Fill = new SolidColorPaint(SKColors.DeepSkyBlue.WithAlpha(127), 0),
                        GeometrySize = 0,
                        ShowDataLabels = false,
                        Stroke = new SolidColorPaint(SKColors.DeepSkyBlue, 1),
                        GeometryFill = new SolidColorPaint(SKColors.Transparent, 0),
                        GeometryStroke = new SolidColorPaint(SKColors.Transparent, 0),
                        IsHoverable = false,
                        DataPadding = new LiveChartsCore.Drawing.LvcPoint(0.1f, 0.1f)
                    }
                ],
                yAxes:
                [
                    new Axis
                    {
                        MinLimit = minLimit,
                        MaxLimit = maxLimit,
                        MinStep = minStep,
                        Name = name
                    }
                ],
                xAxes:
                [
                    new Axis
                    {
                        IsVisible = false,
                        Padding = new LiveChartsCore.Drawing.Padding(0)
                    }
                ]
            );
        }
        ResourceBarViewModel CreateBarViewModel(ILogger<ResourceBarViewModel> logger, Func<LiveChartsCore.Kernel.ChartPoint<ObservableValue, LiveChartsCore.SkiaSharpView.Drawing.Geometries.DoughnutGeometry, LiveChartsCore.SkiaSharpView.Drawing.Geometries.LabelGeometry>, string> formatter)
        {
            return new ResourceBarViewModel(
                logger: logger,
                series:
                [
                    new PieSeries<ObservableValue>
                    {
                        Values = new ObservableCollection<ObservableValue> { new ObservableValue(1) },
                        Fill = new SolidColorPaint(SKColors.DeepSkyBlue, 0),
                        ShowDataLabels = true,
                        IsHoverable = false,
                        HoverPushout = 0,
                        DataLabelsFormatter = formatter,
                        DataLabelsPosition = LiveChartsCore.Measure.PolarLabelsPosition.ChartCenter,
                        DataLabelsPaint = new SolidColorPaint(SKColors.White)
                    },
                    new PieSeries<ObservableValue>
                    {
                        Values = new ObservableCollection<ObservableValue> { new ObservableValue(1) },
                        Fill = new SolidColorPaint(SKColors.DeepSkyBlue.WithAlpha(64), 0),
                        ShowDataLabels = false,
                        IsHoverable = false,
                        HoverPushout = 0
                    }
                ]
            );
        }

        CpuUsageChartViewModel = CreateChartViewModel(resourceChartViewModelCpuUsageLogger, "Нагрузка ЦПУ, %", 0, 100, 10);
        CpuTemperatureChartViewModel = CreateChartViewModel(resourceChartViewModelCpuTemperatureLogger, "Температура ЦПУ, ℃", 0, 100, 10);
        MemoryUsageChartViewModel = CreateChartViewModel(resourceChartViewModelMemoryUsageLogger, "Нагрузка ОЗУ, МБ", 0, 8000, 1000);

        CpuUsageBarsViewModel = new ResourceCpuUsageBarsViewModel(
            resourceCpuUsageBarsViewModelLogger,
            CreateBarViewModel(resourceBarViewModelCpuUsageLogger, value => $"{value.Model?.Value?.ToString("00.00")} %"),
            CreateBarViewModel(resourceBarViewModelCpu0UsageLogger, value => $"{value.Model?.Value?.ToString("00.00")} %"),
            CreateBarViewModel(resourceBarViewModelCpu1UsageLogger, value => $"{value.Model?.Value?.ToString("00.00")} %"),
            CreateBarViewModel(resourceBarViewModelCpu2UsageLogger, value => $"{value.Model?.Value?.ToString("00.00")} %"),
            CreateBarViewModel(resourceBarViewModelCpu3UsageLogger, value => $"{value.Model?.Value?.ToString("00.00")} %")
        );
        CpuTemperatureBarViewModel = CreateBarViewModel(resourceBarViewModelCpuTemperatureLogger, value => $"{value.Model?.Value?.ToString("00.00")} ℃");
        MemoryUsageBarViewModel = CreateBarViewModel(resourceBarViewModelMemoryUsageLogger, value => $"{value.Model?.Value?.ToString("000.00")} МБ");

        Update();

        _updateTimer = new System.Timers.Timer(_intervalMs);
        _updateTimer.Elapsed += UpdateTimerElapsed;
        _updateTimer.AutoReset = true;
        _updateTimer.Start();

        _logger.LogInformation("Initialized");
    }

    partial void OnBoundsChanged(Rect value)
    {
        if (value.Width < 300)
        {
            IsChartsColumnVisible = false;
            IsBarsColumnVisible = true;
        }
        else if (value.Width < 400)
        {
            IsChartsColumnVisible = true;
            IsBarsColumnVisible = false;
        }
        else
        {
            IsChartsColumnVisible = true;
            IsBarsColumnVisible = true;
        }
    }

    private void UpdateTimerElapsed(object? sender, System.Timers.ElapsedEventArgs ea) => Update();
    private void Update()
    {
        try
        {
            var snapshot = _computeResourcesService.GetSnapshot();
            Dispatcher.UIThread.Post(() =>
            {
                if (CpuTemperatureChartViewModel.YAxes.Count() == 1)
                    CpuTemperatureChartViewModel.YAxes.First().MaxLimit = snapshot.CpuTemperature.Critical;
                if (MemoryUsageChartViewModel.YAxes.Count() == 1)
                    MemoryUsageChartViewModel.YAxes.First().MaxLimit = snapshot.MemoryUsage.TotalMB;

                CpuUsageChartViewModel.AppendValue(Math.Round(snapshot.CpuUsage.AllUsagePercent, 2), _chartsHistorySize);
                CpuTemperatureChartViewModel.AppendValue(Math.Round(snapshot.CpuTemperature.Current, 2), _chartsHistorySize);
                MemoryUsageChartViewModel.AppendValue(Math.Round(snapshot.MemoryUsage.UsedMB, 2), _chartsHistorySize);

                CpuUsageBarsViewModel.Cpu.UpdateValue(Math.Round(snapshot.CpuUsage.AllUsagePercent, 2), 100);
                CpuUsageBarsViewModel.Cpu0.UpdateValue(Math.Round(snapshot.CpuUsage.CoreUsagePercents.Skip(0).First(), 2), 100);
                CpuUsageBarsViewModel.Cpu1.UpdateValue(Math.Round(snapshot.CpuUsage.CoreUsagePercents.Skip(1).First(), 2), 100);
                CpuUsageBarsViewModel.Cpu2.UpdateValue(Math.Round(snapshot.CpuUsage.CoreUsagePercents.Skip(2).First(), 2), 100);
                CpuUsageBarsViewModel.Cpu3.UpdateValue(Math.Round(snapshot.CpuUsage.CoreUsagePercents.Skip(3).First(), 2), 100);
                CpuTemperatureBarViewModel.UpdateValue(Math.Round(snapshot.CpuTemperature.Current, 2), snapshot.CpuTemperature.Critical);
                MemoryUsageBarViewModel.UpdateValue(Math.Round(snapshot.MemoryUsage.UsedMB, 2), snapshot.MemoryUsage.TotalMB);
            });
        }
        catch (Exception e)
        {
            _logger.LogWarning(e, "Exception while update");
        }
    }

    protected virtual void Dispose(bool disposing)
    {
        if (!_disposedValue)
        {
            if (disposing)
            {
                try
                {
                    _updateTimer.Stop();
                    _updateTimer.Dispose();
                }
                catch
                { }
            }

            _disposedValue = true;
        }
    }
    public void Dispose()
    {
        Dispose(disposing: true);
        GC.SuppressFinalize(this);
    }
}