IoTScCodeBlock.cs

using NeuroAccessMaui.Services;
using NeuroAccessMaui.Services.UI.Photos;
using NeuroAccessMaui.UI.Pages.Contracts.MyContracts.ObjectModels;
using System.Globalization;
using System.Text;
using System.Xml;
using Waher.Content.Markdown;
using Waher.Content.Markdown.Model;
using Waher.Networking.XMPP.Contracts;
using Waher.Runtime.Inventory;
 
namespace NeuroAccessMaui.UI.Rendering.CodeContent
{
    public class IoTScCodeBlock : ICodeContent, ICodeContentMauiXamlRenderer
    {
        private MarkdownDocument? document;
 
        public IoTScCodeBlock()
        {
        }
 
        public MarkdownDocument? Document => this.document;
 
        public bool EvaluatesScript => false;
 
        public async Task<bool> RenderMauiXaml(MauiXamlRenderer Renderer, string[] Rows, string Language, int Indent, MarkdownDocument Document)
        {
            XmlWriter Output = Renderer.XmlOutput;
            Contract Contract;
 
            try
            {
                StringBuilder sb = new();
 
                foreach (string Row in Rows)
                    sb.AppendLine(Row);
 
                XmlDocument Doc = new()
                {
                    PreserveWhitespace = true
                };
                Doc.LoadXml(sb.ToString());
 
                ParsedContract Parsed = await Contract.Parse(Doc.DocumentElement, ServiceRef.XmppService.ContractsClient, false);
                if (Parsed is null)
                    return false;
 
                Contract = Parsed.Contract;
            }
            catch (Exception ex)
            {
                Output.WriteStartElement("Label");
                Output.WriteAttributeString("Text", ex.Message);
                Output.WriteAttributeString("FontFamily", "Courier New");
                Output.WriteAttributeString("TextColor", "Red");
                Output.WriteAttributeString("LineBreakMode", "WordWrap");
                Output.WriteEndElement();
 
                return false;
            }
 
            Output.WriteStartElement("VerticalStackLayout");
            Output.WriteAttributeString("HorizontalOptions", "Center");
 
            bool ImageShown = false;
 
            if (Contract.Attachments is not null)
            {
                (string? FileName, int Width, int Height) = await PhotosLoader.LoadPhotoAsTemporaryFile(Contract.Attachments,
                    Constants.QrCode.DefaultImageWidth, Constants.QrCode.DefaultImageHeight);
 
                if (!string.IsNullOrEmpty(FileName))
                {
                    Output.WriteStartElement("Image");
                    Output.WriteAttributeString("Source", FileName);
                    Output.WriteAttributeString("WidthRequest", Width.ToString(CultureInfo.InvariantCulture));
                    Output.WriteAttributeString("HeightRequest", Height.ToString(CultureInfo.InvariantCulture));
                    Output.WriteEndElement();
 
                    ImageShown = true;
                }
            }
 
            if (!ImageShown)
            {
                Output.WriteStartElement("Path");
                Output.WriteAttributeString("VerticalOptions", "Center");
                Output.WriteAttributeString("HorizontalOptions", "Center");
                Output.WriteAttributeString("HeightRequest", "16");
                Output.WriteAttributeString("WidthRequest", "16");
                Output.WriteAttributeString("Aspect", "Uniform");
                Output.WriteAttributeString("Fill", "{AppThemeBinding Light={StaticResource PrimaryForegroundLight}, Dark={StaticResource PrimaryForegroundDark}}");
                Output.WriteAttributeString("Data", "{x:Static ui:Geometries.ContractPath}");
                Output.WriteEndElement();
            }
 
            string? FriendlyName = await ContractModel.GetCategory(Contract);
 
            Output.WriteStartElement("Label");
            Output.WriteAttributeString("LineBreakMode", "WordWrap");
            Output.WriteAttributeString("FontSize", "Medium");
            Output.WriteAttributeString("HorizontalOptions", "Center");
            Output.WriteAttributeString("Text", FriendlyName);
            Output.WriteEndElement();
 
            Output.WriteStartElement("VerticalStackLayout.GestureRecognizers");
 
            StringBuilder Xml = new();
            Contract.Serialize(Xml, true, true, true, true, true, true, true);
 
            Output.WriteStartElement("TapGestureRecognizer");
            Output.WriteAttributeString("Command", "{Binding Path=IotScUriClicked}");
            Output.WriteAttributeString("CommandParameter", Constants.UriSchemes.IotSc + ":" + Xml.ToString());
            Output.WriteEndElement();
 
            Output.WriteEndElement();
            Output.WriteEndElement();
 
            return true;
        }
 
        public void Register(MarkdownDocument Document)
        {
            this.document = Document;
        }
 
        public Grade Supports(string Language)
        {
            return string.Equals(Language, Constants.UriSchemes.IotSc, StringComparison.OrdinalIgnoreCase) ? Grade.Excellent : Grade.NotAtAll;
        }
    }
}