using System;
using System.Xml;
using Tizen.NUI.StyleSheets;
using System.Reflection;
using System.IO;
using Tizen.NUI.Binding;
using System.ComponentModel;

namespace Tizen.NUI.Xaml
{
    /// This will be public opened in tizen_6.0 after ACR done. Before ACR, need to be hidden as inhouse API.
    [EditorBrowsable(EditorBrowsableState.Never)]
    [ContentProperty(nameof(Style))]
    [ProvideCompiled("Tizen.NUI.Core.XamlC.StyleSheetProvider")]
    public sealed class StyleSheetExtension : IValueProvider
    {
        /// This will be public opened in tizen_6.0 after ACR done. Before ACR, need to be hidden as inhouse API.
        [EditorBrowsable(EditorBrowsableState.Never)]
        public string Style { get; set; }

        /// This will be public opened in tizen_6.0 after ACR done. Before ACR, need to be hidden as inhouse API.
        [EditorBrowsable(EditorBrowsableState.Never)]
        public Uri Source { get; set; }

        object IValueProvider.ProvideValue(IServiceProvider serviceProvider)
        {
            IXmlLineInfo lineInfo;

            if (!string.IsNullOrEmpty(Style) && Source != null)
            {
                lineInfo = (serviceProvider.GetService(typeof(IXmlLineInfoProvider)) as IXmlLineInfoProvider)?.XmlLineInfo;
                throw new XamlParseException($"StyleSheet can not have both a Source and a content", lineInfo);
            }

            if (Source != null)
            {
                lineInfo = (serviceProvider.GetService(typeof(IXmlLineInfoProvider)) as IXmlLineInfoProvider)?.XmlLineInfo;
                if (Source.IsAbsoluteUri)
                    throw new XamlParseException($"Source only accepts Relative URIs", lineInfo);

                var rootObjectType = (serviceProvider.GetService(typeof(IRootObjectProvider)) as IRootObjectProvider)?.RootObject.GetType();
                if (rootObjectType == null)
                    return null;
                var rootTargetPath = XamlResourceIdAttribute.GetPathForType(rootObjectType);
                var resourcePath = ResourceDictionary.RDSourceTypeConverter.GetResourcePath(Source, rootTargetPath);
                var resString = DependencyService.Get<IResourcesLoader>()?.GetResource(resourcePath, rootObjectType.GetTypeInfo().Assembly, lineInfo);
                return StyleSheet.FromString(resString);
            }

            if (!string.IsNullOrEmpty(Style))
            {
                using (var reader = new StringReader(Style))
                    return StyleSheet.FromReader(reader);
            }

            lineInfo = (serviceProvider.GetService(typeof(IXmlLineInfoProvider)) as IXmlLineInfoProvider)?.XmlLineInfo;
            throw new XamlParseException($"StyleSheet require either a Source or a content", lineInfo);
        }
    }
}