using Sarand.Net.Standard.Base.App;
using Sarand.Net.Standard.Base.Bus;
using Sarand.Net.Standard.Base.Core;
using Sarand.Net.Standard.Base.Utils;
using Saxonite.Net.Standard.Base.App;
using System;
using System.Collections.Generic;
using System.Text;
using System.Xml.Linq;

namespace Saxonite.Net.Standard.Base.Bus
{
	//=======================================================================
	// Article - Content data.
	//=======================================================================
	partial class SaxArticle
	{
		//-------------------------------------------------------------------
		// Definitions.
		private static readonly String ElementName_Content = "content";
		private static readonly String ElementName_Segments = "segments";
		private static readonly String ElementName_Segment = "segment";
		private static readonly String ElementName_Body = "body";
		private static readonly String ElementName_Html = "html";
		private static readonly String ElementName_Image = "image";
		private static readonly String ElementName_ImageId = "imageId";

		//-------------------------------------------------------------------
		/// <summary>Article content.</summary>
		public class ContentData
		{
			/// <summary>
			/// Article Content Segment - either body content or image.
			/// </summary>
			public class SegmentData
			{
				// Segment body.
				public class BodyData
				{
					public bool IsValid()
					{
						if (!StringUtil.IsEmpty(Html)) return true;
						return false;
					}
					public String Html { get; set; } = String.Empty;
				}
				public BodyData Body { get; } = new BodyData();
				// Segment image.
				public class ImageData
				{
					public bool IsValid()
					{
						if (SysId.IsValid(ItemImageId)) return true;
						return false;
					}
					public SysId ItemImageId { get; set; }
				}
				public ImageData Image { get; } = new ImageData();
				// Validate.
				public bool IsValid()
				{
					if (Body.IsValid()) return true;
					if (Image.IsValid()) return true;
					return false;
				}
			}
			public List<SegmentData> Segments { get; } = new List<SegmentData>();
			// Add segment.
			public SegmentData AddSegment()
			{
				SegmentData segment = new SegmentData();
				Segments.Add(segment);
				return segment;
			}
		}

		//-------------------------------------------------------------------
		/// <summary>
		/// Convert serialised data from database to Content.
		/// </summary>
		public static ContentData ExtractContent(String contentData)
		{
			String fn = typeof(ContentData).FullName + ".ExtractContent";
			ContentData content = new ContentData();
			if (StringUtil.IsEmpty(contentData)) return content;

			try
			{
				// Load XML data.
				XDocument doc = XDocument.Parse(contentData);
				XElement rootElement = doc.Root;
				foreach (XElement rootChildElement in rootElement.GetChildElements())
				{
					String rootChildElementName = rootChildElement.GetLocalName();
					if (rootChildElementName.EqualsCI(ElementName_Segments))
					{
						// Content segments.
						XElement segmentsElement = rootChildElement;
						foreach (XElement segmentsChildElement in segmentsElement.GetChildElements())
						{
							String segmentsChildElementName = segmentsChildElement.GetLocalName();
							if (segmentsChildElementName.EqualsCI(ElementName_Segment))
							{
								// Content segment.
								ContentData.SegmentData segment = new ContentData.SegmentData();
								XElement segmentElement = segmentsChildElement;
								foreach (XElement segmentChildElement in segmentElement.GetChildElements())
								{
									String segmentChildElementName = segmentChildElement.GetLocalName();
									if (segmentChildElementName.EqualsCI(ElementName_Body))
									{
										// Content segment body.
										XElement bodyElement = segmentChildElement;
										foreach (XElement bodyChildElement in bodyElement.GetChildElements())
										{
											String bodyChildElementName = bodyChildElement.GetLocalName();
											if (bodyChildElementName.EqualsCI(ElementName_Html))
											{
												// Content segment body HTML.
												XElement htmlElement = bodyChildElement;
												segment.Body.Html = htmlElement.Value;
											}
											else SaLogger.Warn(fn + " Unexpected 'Segment' child element: " + segmentChildElementName);
										}
									}
									else if (segmentChildElementName.EqualsCI(ElementName_Image))
									{
										// Content segment image.
										XElement imageElement = segmentChildElement;
										foreach (XElement imageChildElement in imageElement.GetChildElements())
										{
											String imageChildElementName = imageChildElement.GetLocalName();
											if (imageChildElementName.EqualsCI(ElementName_ImageId))
											{
												// Content segment image Id.
												XElement imageIdElement = imageChildElement;
												segment.Image.ItemImageId = imageIdElement.Value.ToSysId();
											}
											else SaLogger.Warn(fn + " Unexpected 'Segment' child element: " + segmentChildElementName);
										}
									}
									else SaLogger.Warn(fn + " Unexpected 'Segment' child element: " + segmentChildElementName);
								}
								// Add this segment to the list.
								if (segment.IsValid())
									content.Segments.Add(segment);
							}
							else SaLogger.Warn(fn + " Unexpected 'Segments' child element: " + segmentsChildElementName);
						}
					}
					else SaLogger.Warn(fn + " Unexpected 'Root' child element: " + rootChildElementName);
				}
			}
			catch (Exception exc)
			{
				SaLogger.Warn(fn + " " + ExceptionUtil.GetLogMessage(exc));
			}

			return content;
		}

		//-------------------------------------------------------------------
		/// <summary>
		/// Convert Content to serialised data to store on database.
		/// </summary>
		public static String GetContentData(ContentData content)
		{
			String fn = typeof(ContentData).FullName + ".GetContentData";

			try
			{
				XDocument doc = new XDocument();
				XElement contentElement = doc.AppendElement(ElementName_Content);
				XElement segmentsElement = contentElement.AppendElement(ElementName_Segments);
				foreach (ContentData.SegmentData segment in content.Segments)
				{
					if (!segment.IsValid()) continue;
					XElement segmentElement = segmentsElement.AppendElement(ElementName_Segment);
					if (segment.Body.IsValid())
					{
						// Segment Body.
						XElement bodyElement = segmentElement.AppendElement(ElementName_Body);
						if (!StringUtil.IsEmpty(segment.Body.Html))
							bodyElement.AppendElement(ElementName_Html, segment.Body.Html);
					}
					else if (segment.Image.IsValid())
					{
						// Segment Image.
						XElement imageElement = segmentElement.AppendElement(ElementName_Image);
						if (SysId.IsValid(segment.Image.ItemImageId))
							imageElement.AppendElement(ElementName_ImageId, SysId.ToString(segment.Image.ItemImageId));
					}
				}
				return doc.GetXml();
			}
			catch (Exception exc)
			{
				SaLogger.Warn(fn + " " + ExceptionUtil.GetLogMessage(exc));
			}

			return "";
		}

		//-------------------------------------------------------------------
	}
	//=======================================================================
}