@using Color = System.Drawing.Color

<LineChart @ref="lineChart" Width="500" Class="mb-4" />

@* <Button Type="ButtonType.Button" Color="ButtonColor.Primary" Size="Size.Small" @onclick="async () => await RandomizeAsync()"> Randomize </Button>
<Button Type="ButtonType.Button" Color="ButtonColor.Primary" Size="Size.Small" @onclick="async () => await AddDatasetAsync()"> Add Dataset </Button>
<Button Type="ButtonType.Button" Color="ButtonColor.Primary" Size="Size.Small" @onclick="async () => await AddDataAsync()"> Add Data </Button>
<Button Type="ButtonType.Button" Color="ButtonColor.Primary" Size="Size.Small" @onclick="async () => await ShowHorizontalLineChartAsync()"> Horizontal Line Chart </Button>
<Button Type="ButtonType.Button" Color="ButtonColor.Primary" Size="Size.Small" @onclick="async () => await ShowVerticalLineChartAsync()"> Vertical Line Chart </Button>
 *@
@code {
    private LineChart lineChart = default!;
    private LineChartOptions lineChartOptions = default!;
    private ChartData chartData = default!;

    private int datasetsCount = 0;
    private int labelsCount = 0;

    private Random random = new();

    protected override void OnInitialized()
    {
        chartData = new ChartData { Labels = GetDefaultDataLabels(31), Datasets = GetDefaultDataSets(1) };
        lineChartOptions = new() { Responsive = true, Interaction = new Interaction { Mode = InteractionMode.Index } };
    }

    protected override async Task OnAfterRenderAsync(bool firstRender)
    {
        if (firstRender)
        {
            await lineChart.InitializeAsync(chartData, lineChartOptions);
        }
        await base.OnAfterRenderAsync(firstRender);
    }

    private async Task RandomizeAsync()
    {
        if (chartData is null || chartData.Datasets is null || !chartData.Datasets.Any()) return;

        var newDatasets = new List<IChartDataset>();

        foreach (var dataset in chartData.Datasets)
        {
            if (dataset is LineChartDataset lineChartDataset
                && lineChartDataset is not null
                && lineChartDataset.Data is not null)
            {
                var count = lineChartDataset.Data.Count;

                var newData = new List<double>();
                for (var i = 0; i < count; i++)
                {
                    newData.Add(random.Next(200));
                }

                lineChartDataset.Data = newData;
                newDatasets.Add(lineChartDataset);
            }
        }

        chartData.Datasets = newDatasets;

        await lineChart.UpdateAsync(chartData, lineChartOptions);
    }

    private async Task AddDatasetAsync()
    {
        if (chartData is null || chartData.Datasets is null) return;

        var chartDataset = GetRandomLineChartDataset();
        chartData = await lineChart.AddDatasetAsync(chartData, chartDataset, lineChartOptions);
    }

    private async Task AddDataAsync()
    {
        if (chartData is null || chartData.Datasets is null)
            return;

        var data = new List<IChartDatasetData>();
        foreach (var dataset in chartData.Datasets)
        {
            if (dataset is LineChartDataset lineChartDataset)
                data.Add(new LineChartDatasetData(lineChartDataset.Label, random.Next(200)));
        }

        chartData = await lineChart.AddDataAsync(chartData, GetNextDataLabel(), data);
    }

    private async Task ShowHorizontalLineChartAsync()
    {
        lineChartOptions.IndexAxis = "y";
        await lineChart.UpdateAsync(chartData, lineChartOptions);
    }

    private async Task ShowVerticalLineChartAsync()
    {
        lineChartOptions.IndexAxis = "x";
        await lineChart.UpdateAsync(chartData, lineChartOptions);
    }

    #region Data Preparation

    private List<IChartDataset> GetDefaultDataSets(int numberOfDatasets)
    {
        var datasets = new List<IChartDataset>();

        for (var index = 0; index < numberOfDatasets; index++)
        {
            datasets.Add(GetRandomLineChartDataset());
        }

        return datasets;
    }

    private LineChartDataset GetRandomLineChartDataset()
    {
        var c = ColorBuilder.CategoricalTwelveColors[datasetsCount].ToColor();

        datasetsCount += 1;

        return new LineChartDataset()
            {
                Label = $"فروش",
                Data = GetRandomData(),
                BackgroundColor = new List<string> { c.ToRgbString() },
                BorderColor = new List<string> { c.ToRgbString() },
                BorderWidth = new List<double> { 2 },
                HoverBorderWidth = new List<double> { 4 },
                PointBackgroundColor = new List<string> { c.ToRgbString() },
                PointRadius = new List<int> { 0 }, // hide points
                PointHoverRadius = new List<int> { 4 },
            };
    }

    private List<double> GetRandomData()
    {
        var data = new List<double>();
        for (var index = 0; index < labelsCount; index++)
        {
            data.Add(random.Next(200));
        }

        return data;
    }

    private List<string> GetDefaultDataLabels(int numberOfLabels)
    {
        var labels = new List<string>();
        for (var index = 0; index < numberOfLabels; index++)
        {
            labels.Add(GetNextDataLabel());
        }

        return labels;
    }

    private string GetNextDataLabel()
    {
        labelsCount += 1;
        return $"روز {labelsCount}";
    }

    #endregion Data Preparation
}