using System.Collections.Generic;
using System.Configuration;
using System.IO;
using System.Xml;
using AspClassic.Scripting.Runtime;
using AspClassic.Scripting.Utils;

namespace AspClassic.Scripting.Hosting.Configuration;

public class Section : ConfigurationSection
{
	private const string _DebugMode = "debugMode";

	private const string _PrivateBinding = "privateBinding";

	private const string _Languages = "languages";

	private const string _Options = "options";

	public static readonly string SectionName = "AspClassic.Scripting";

	private static ConfigurationPropertyCollection _Properties = new ConfigurationPropertyCollection
	{
		new ConfigurationProperty("debugMode", typeof(bool?), null),
		new ConfigurationProperty("privateBinding", typeof(bool?), null),
		new ConfigurationProperty("languages", typeof(LanguageElementCollection), null, ConfigurationPropertyOptions.IsDefaultCollection),
		new ConfigurationProperty("options", typeof(OptionElementCollection), null)
	};

    protected override ConfigurationPropertyCollection Properties => _Properties;

    public bool? DebugMode
	{
		get
		{
			return (bool?)base["debugMode"];
		}
		set
		{
			base["debugMode"] = value;
		}
	}

	public bool? PrivateBinding
	{
		get
		{
			return (bool?)base["privateBinding"];
		}
		set
		{
			base["privateBinding"] = value;
		}
	}

	public IEnumerable<LanguageElement> GetLanguages()
	{
		if (!(base["languages"] is LanguageElementCollection languages))
		{
			yield break;
		}
		foreach (object languageConfig in languages)
		{
			yield return (LanguageElement)languageConfig;
		}
	}

	public IEnumerable<OptionElement> GetOptions()
	{
		if (!(base["options"] is OptionElementCollection options))
		{
			yield break;
		}
		foreach (object option in options)
		{
			yield return (OptionElement)option;
		}
	}

	private static Section LoadFromFile(Stream configFileStream)
	{
		Section section = new Section();
		using XmlReader xmlReader = XmlReader.Create(configFileStream);
		if (xmlReader.ReadToDescendant("configuration") && xmlReader.ReadToDescendant(SectionName))
		{
			section.DeserializeElement(xmlReader, serializeCollectionKey: false);
			return section;
		}
		return null;
	}

	internal static void LoadRuntimeSetup(ScriptRuntimeSetup setup, Stream configFileStream)
	{
		Section section = ((configFileStream == null) ? (ConfigurationManager.GetSection(SectionName) as Section) : LoadFromFile(configFileStream));
		if (section == null)
		{
			return;
		}
		if (section.DebugMode.HasValue)
		{
			setup.DebugMode = section.DebugMode.Value;
		}
		if (section.PrivateBinding.HasValue)
		{
			setup.PrivateBinding = section.PrivateBinding.Value;
		}
		foreach (LanguageElement language in section.GetLanguages())
		{
			string type = language.Type;
			string[] namesArray = language.GetNamesArray();
			string[] extensionsArray = language.GetExtensionsArray();
			string displayName = language.DisplayName ?? ((namesArray.Length > 0) ? namesArray[0] : language.Type);
			bool flag = false;
			foreach (LanguageSetup languageSetup in setup.LanguageSetups)
			{
				if (languageSetup.TypeName == type)
				{
					languageSetup.Names.Clear();
					string[] array = namesArray;
					foreach (string item in array)
					{
						languageSetup.Names.Add(item);
					}
					languageSetup.FileExtensions.Clear();
					string[] array2 = extensionsArray;
					foreach (string item2 in array2)
					{
						languageSetup.FileExtensions.Add(item2);
					}
					languageSetup.DisplayName = displayName;
					flag = true;
					break;
				}
			}
			if (!flag)
			{
				setup.LanguageSetups.Add(new LanguageSetup(type, displayName, namesArray, extensionsArray));
			}
		}
		OptionElement option;
		foreach (OptionElement option2 in section.GetOptions())
		{
			option = option2;
			if (string.IsNullOrEmpty(option.Language))
			{
				setup.Options[option.Name] = option.Value;
				continue;
			}
			bool flag2 = false;
			foreach (LanguageSetup languageSetup2 in setup.LanguageSetups)
			{
				if (Utils.CollectionExtensions.Any(languageSetup2.Names,(string s) => DlrConfiguration.LanguageNameComparer.Equals(s, option.Language)))
				{
					languageSetup2.Options[option.Name] = option.Value;
					flag2 = true;
					break;
				}
			}
			if (flag2)
			{
				continue;
			}
			throw new ConfigurationErrorsException($"Unknown language name: '{option.Language}'");
		}
	}
}