using System.Text;
using DevExpress.Docs.Presentation;

string ReadDocumentProperties(Stream inputStream, bool readDocumentProperties, bool readCustomProperties) {
    var output = new StringBuilder();

    using var presentation = new Presentation(inputStream);

    if(readDocumentProperties) {
        // Core Properties
        var coreProperties = presentation.DocumentProperties;
        output.AppendLine("CORE DOCUMENT PROPERTIES:");
        output.AppendLine(new string('-', 30));
        output.AppendLine($"Title: {coreProperties.Title ?? ""}");
        output.AppendLine($"Author: {coreProperties.Author ?? ""}");
        output.AppendLine($"Subject: {coreProperties.Subject ?? ""}");
        output.AppendLine($"Keywords: {coreProperties.Keywords ?? ""}");
        output.AppendLine($"Category: {coreProperties.Category ?? ""}");
        output.AppendLine($"Company: {coreProperties.Company ?? ""}");
        output.AppendLine($"Manager: {coreProperties.Manager ?? ""}");
        output.AppendLine($"Created Date: {coreProperties.Created.ToString("yyyy-MM-dd HH:mm:ss")}");
        output.AppendLine($"Last Printed: {coreProperties.Printed.ToString("yyyy-MM-dd HH:mm:ss")}");
        output.AppendLine();
    }

    if(readCustomProperties) {
        var customProperties = presentation.DocumentProperties.CustomProperties;

        output.AppendLine("CUSTOM PROPERTIES:");
        output.AppendLine(new string('-', 30));

        // Check if there are any custom properties
        var hasCustomProperties = false;
        var customPropsList = new List<string>();

        foreach(string propName in customProperties.Keys) {
            hasCustomProperties = true;
            var propValue = customProperties[propName];
            var valueStr = propValue.ToString() ?? "";
            var typeStr = propValue.GetType().Name ?? "String";
            customPropsList.Add($"{propName}: {valueStr} ({typeStr})");
        }
        if(!hasCustomProperties)
            output.AppendLine("No custom properties found.");
        else
            foreach(var customProp in customPropsList)
                output.AppendLine(customProp);
        output.AppendLine();
    }
    return output.ToString();
}