using System;
using System.Xml;
using BetterPatchFileCreator.XAML;

namespace BetterPatchFileCreator.Code
{
	public static class DataProvider {
		private const string ConfigsPath = "Settings.xml";
		public static string BasePath = "C:\\Patches";

		public static MainWindow MainWindowInstance;

		public static PatchConfigCollection PatchConfigs { get; private set; }
		public static DeployConfigCollection DeployConfigs { get; private set; }

		public static void Save() {
			XmlDocument doc = new XmlDocument();
			XmlNode root = doc.CreateElement("Settings");
			doc.AppendChild(root);
			AddConfigNodes(root, doc);
			AddSettingsNodes(root, doc);
			doc.Save(ConfigsPath);
		}
		private static void  AddSettingsNodes(XmlNode root, XmlDocument doc) {
			XmlNode node = doc.CreateElement("RootDir");
			node.InnerText = BasePath;
			root.AppendChild(node);
		}
		private static void AddConfigNodes(XmlNode root, XmlDocument source) {
			root.AppendChild(PatchConfigs.ToXmlNode(source));
			root.AppendChild(DeployConfigs.ToXmlNode(source));
		}
		public static void Intialize() {
			PatchConfigs = new PatchConfigCollection();
			DeployConfigs = new DeployConfigCollection();
			ParseSettings();
		}

		private static void ParseSettings() {
			XmlDocument doc = new XmlDocument();
			doc.Load(ConfigsPath);
			XmlNode root = doc;
			foreach (XmlNode node in root.ChildNodes) {
				if (node.Name == "Settings") {
					root = node;
					break;
				}
			}
			if(root.Name != "Settings")
				throw new InvalidOperationException();
			ParseXmlNodes(root);
		}
		private static void ParseXmlNodes(XmlNode node) {
			switch (node.Name) {
				case "PatchConfigs":
					PatchConfigs.ParseFromXmlNode(node);
					break;
				case "DeployConfigs":
					DeployConfigs.LoadFromXmlNode(node);
					break;
				case "RootDir":
					BasePath = node.InnerText;
					break;
				default:
					foreach (XmlNode n in node.ChildNodes) {
						ParseXmlNodes(n);
					}
					break;
			}
		}
	}
}