using DevExpress.Docs.Presentation;
using DevExpress.Office.Utils;
using DevExpress.Docs.Office;
using System.Drawing;

Stream CreatePresentationChart(ChartOptions chartOptions, bool isPdfOutput, DocumentFormat format) {
    using var presentation = new Presentation();
    presentation.Slides.Clear();

    var slide = new Slide(SlideLayoutType.Blank);
    presentation.Slides.Add(slide);

    var chartHeightInDocuments = Units.InchesToDocumentsF(chartOptions.ChartHeight);
    var chart = new Chart(100, 100, chartHeightInDocuments * 2, chartHeightInDocuments);

    slide.Shapes.Add(chart);

    // Apply title settings
    var textArea = new TextArea(chartOptions.ChartTitle);
    textArea.Paragraphs.First().Properties.TextProperties.Fill = new SolidFill(Color.FromArgb(0x1D, 0x2B, 0x64));
    chart.Title = new ChartTitle(textArea);

    // Apply legend settings
    if(chartOptions.ShowLegend) {
        chart.Legend.Position = chartOptions.LegendPosition;
    } else {
        chart.Legend = null;
    }

    // Specify chart data
    var months = new[] { "January", "February", "March", "April", "May", "June" };
    var units = new[] { 50.0, 100.0, 30.0, 104.0, 87.0, 150.0 };
    var transactions = new[] { 900.0, 3000.0, 1200.0, 7000.0, 5100.0, 7500.0 };

    // Add primary series
    var unitsSoldSeries = new BarSeries {
        Text = "Units Sold",
        Arguments = new ChartStringData(months),
        Values = new ChartNumericData(units)
    };

    // Add trendline for the first series
    if(chartOptions.ShowTrendline) {
        unitsSoldSeries.TrendLine = new TrendLine() {
            Name = $"{unitsSoldSeries.Text} trend",
            Type = TrendLineType.Linear,
            OutlineStyle = new LineStyle() {
                Width = 2,
                Fill = new SolidFill(Color.Red)
            }
        };
    }

    // Show primary series data labels
    unitsSoldSeries.DataLabels.ShowValue = chartOptions.ShowDataLabels;
    chart.Series.Add(unitsSoldSeries);

    // Add secondary series
    var totalTransactionsSeries = new LineSeries {
        Text = "Total Transactions",
        Arguments = new ChartStringData(months),
        Values = new ChartNumericData(transactions),
        AxisGroup = ChartAxisGroupType.Secondary
    };
    chart.Series.Add(totalTransactionsSeries);

    // Apply primary axis settings
    if(chartOptions.ShowAxisTitles) {
        chart.ArgumentAxis.Title = new ChartTitleOptions("Months");
        chart.ValueAxis.Title = new ChartTitleOptions("Units");
    }

    // Apply secondary axis settings
    chart.SecondaryArgumentAxis.Visible = false;
    chart.SecondaryValueAxis.Position = AxisPositionType.Right;

    // Apply gridline settings
    ChartLineOptions gridLineOptions = new ChartLineOptions() {
        OutlineStyle = new OutlineStyle {
            Fill = new SolidFill(Color.Black),
        }
    };
    chart.ValueAxis.MajorGridlines =
    chart.ArgumentAxis.MinorGridlines =
    chart.SecondaryValueAxis.MajorGridlines =
    chart.SecondaryArgumentAxis.MinorGridlines = chartOptions.ShowGridLines ? gridLineOptions : null;

    // Apply chart style
    chart.Style = chartOptions.ChartStyle;

    var outputStream = new MemoryStream();

    if(isPdfOutput)
        presentation.ExportToPdf(outputStream);
    else
        presentation.SaveDocument(outputStream, format);

    outputStream.Position = 0;
    return outputStream;
}

public class ChartOptions {
    public string ChartTitle { get; set; } = "Example Chart";
    public float ChartHeight { get; set; } = 5f;
    public bool ShowTrendline { get; set; } = true;
    public bool ShowDataLabels { get; set; } = true;
    public bool ShowAxisTitles { get; set; } = true;
    public bool ShowGridLines { get; set; } = true;
    public bool ShowLegend { get; set; } = true;
    public LegendPositionType LegendPosition { get; set; } = LegendPositionType.Right;
    public ChartStyle ChartStyle { get; set; } = ChartStyle.Color;
}