@inject IJSRuntime JSRuntime

<canvas id="@Id"></canvas>

@code {

    [Parameter]
    public string Id { get; set; } = "MyHist";

    [Parameter]
    public string[] Data { get; set; }
    [Parameter]
    public string[] Labels { get; set; }

    [Parameter]
    public string lineColor { get; set; }
    [Parameter]
    public string backColor { get; set; }


    protected override async Task OnAfterRenderAsync(bool firstRender)
    {
        //if (!firstRender)
        //{
        await renderChart();
        //}
    }


    /// <summary>
    /// Inizializzazione rendering componente
    ///
    /// partendo da qui:
    /// https://www.williamleme.com/posts/2020/003-chartjs-blazor/
    /// https://www.puresourcecode.com/dotnet/blazor/using-chart-js-with-blazor/
    /// https://www.tutorialsteacher.com/csharp/csharp-anonymous-type
    /// </summary>
    /// <param name="firstRender"></param>
    /// <returns></returns>
    protected async Task renderChart()
    {
        // creazione di un oggetto anonymous type con tutte le opzioni da passare a chart.js
        var config = new
        {
            type = "bar",
            options = new
            {
                responsive = true,
                scales = new
                {
                    yAxes = new
                    {
                        suggestedMin = 0,
                        display = true,
                        ticks = new
                        {
                            beginAtZero = true,
                            maxTicksLimit = 10
                        }
                    }
                }
            },
            data = new
            {
                datasets = new[]
                {
                    new
                    {
                        data = Data,
                        borderColor = lineColor,
                        backgroundColor = backColor,
                        borderWidth = 1,
                        label= "Freq. Osservate"
                    }
                },
                labels = Labels
            }
        };
        await JSRuntime.InvokeVoidAsync("setup", Id, config);
    }

}