#region Using Statements
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Linq;

#endregion // Using Statements

#region License

//
// This file is part of the ANX.Framework created by the "ANX.Framework developer group".
//
// This file is released under the Ms-PL license.
//
//
//
// Microsoft Public License (Ms-PL)
//
// This license governs use of the accompanying software. If you use the software, you accept this license. 
// If you do not accept the license, do not use the software.
//
// 1.Definitions
//   The terms "reproduce," "reproduction," "derivative works," and "distribution" have the same meaning 
//   here as under U.S. copyright law.
//   A "contribution" is the original software, or any additions or changes to the software.
//   A "contributor" is any person that distributes its contribution under this license.
//   "Licensed patents" are a contributor's patent claims that read directly on its contribution.
//
// 2.Grant of Rights
//   (A) Copyright Grant- Subject to the terms of this license, including the license conditions and limitations 
//       in section 3, each contributor grants you a non-exclusive, worldwide, royalty-free copyright license to 
//       reproduce its contribution, prepare derivative works of its contribution, and distribute its contribution
//       or any derivative works that you create.
//   (B) Patent Grant- Subject to the terms of this license, including the license conditions and limitations in 
//       section 3, each contributor grants you a non-exclusive, worldwide, royalty-free license under its licensed
//       patents to make, have made, use, sell, offer for sale, import, and/or otherwise dispose of its contribution 
//       in the software or derivative works of the contribution in the software.
//
// 3.Conditions and Limitations
//   (A) No Trademark License- This license does not grant you rights to use any contributors' name, logo, or trademarks.
//   (B) If you bring a patent claim against any contributor over patents that you claim are infringed by the software, your 
//       patent license from such contributor to the software ends automatically.
//   (C) If you distribute any portion of the software, you must retain all copyright, patent, trademark, and attribution 
//       notices that are present in the software.
//   (D) If you distribute any portion of the software in source code form, you may do so only under this license by including
//       a complete copy of this license with your distribution. If you distribute any portion of the software in compiled or 
//       object code form, you may only do so under a license that complies with this license.
//   (E) The software is licensed "as-is." You bear the risk of using it. The contributors give no express warranties, guarantees,
//       or conditions. You may have additional consumer rights under your local laws which this license cannot change. To the
//       extent permitted under your local laws, the contributors exclude the implied warranties of merchantability, fitness for a 
//       particular purpose and non-infringement.

#endregion // License

namespace StockShaderCodeGenerator
{
    public static class Configuration
    {
        private static string buildFileName;
        private static bool configurationValid;
        private static string licenseFile;
        private static string target;
        private static string outputNamespace;
        public readonly static List<Shader> Shaders = new List<Shader>();

        public static void LoadConfiguration(String file)
        {
            buildFileName = file;

            if (!System.IO.File.Exists(file))
            {
                Console.WriteLine("Could not find build file...");
                return;
            }

            XDocument doc = XDocument.Load(buildFileName);
            if (doc.Root.Name.LocalName != "Build")
            {
                Console.WriteLine("Failed to load configuration because the build file has no Build-Node as the root element!");
                return;
            }
            else
            {
                if (doc.Root.HasAttributes)
                {
                    licenseFile = doc.Root.Attribute("License").Value;
                    if (System.IO.File.Exists(licenseFile))
                    {
                        Console.WriteLine("using license file '{0}' to include", licenseFile);
                    }
                    else
                    {
                        Console.WriteLine("license file '{0}' does not exist", licenseFile);
                        return;
                    }

                    target = doc.Root.Attribute("Target").Value;
                    Console.WriteLine("writing output to '{0}'", target);

                    outputNamespace = doc.Root.Attribute("Namespace").Value;
                    Console.WriteLine("using namespace '{0}'", outputNamespace);
                }

                if (doc.Root.HasElements)
                {
                    XElement[] shaderElements = doc.Root.Elements("Shader").ToArray<XElement>();

                    if (shaderElements.Length > 0)
                    {
                        foreach (XElement shaderElement in shaderElements)
                        {
                            Shader shader = new Shader();
                            shader.Type = shaderElement.Attribute("Type").Value;
                            shader.RenderSystem = shaderElement.Attribute("RenderSystem").Value;
                            shader.Source = shaderElement.Attribute("Source").Value;

                            Shaders.Add(shader);
                        }
                    }
                    else
                    {
                        Console.WriteLine("no shader tags found in configuration file...");
                        return;
                    }
                }
            }

            configurationValid = true;
        }

        public static bool ConfigurationValid
        {
            get
            {
                return configurationValid;
            }
        }

        public static string Target
        {
            get
            {
                return target;
            }
        }

        public static string LicenseFile
        {
            get
            {
                return licenseFile;
            }
        }

        public static string Namespace
        {
            get
            {
                return outputNamespace;
            }
        }
    }
}