//Released under the MIT License.
//
//Copyright (c) 2015 Ntreev Soft co., Ltd.
//
//Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated 
//documentation files (the "Software"), to deal in the Software without restriction, including without limitation the 
//rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit 
//persons to whom the Software is furnished to do so, subject to the following conditions:
//
//The above copyright notice and this permission notice shall be included in all copies or substantial portions of the 
//Software.
//
//THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE 
//WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR 
//COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 
//OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Reflection;
using System.Text;

namespace Ntreev.Library.Psd.Readers
{
    static class ReaderCollector
    {
        private static readonly Dictionary<string, Type> readers;

        static ReaderCollector()
        {
            Assembly assembly = typeof(IResourceBlock).Assembly;

            var query = from item in assembly.GetTypes()
                        where typeof(IResourceBlock).IsAssignableFrom(item) &&
                              (item.Attributes & TypeAttributes.Abstract) != TypeAttributes.Abstract
                        select item;

            readers = new Dictionary<string, Type>(query.Count());

            foreach (var item in query)
            {
                var attrs = item.GetCustomAttributes(typeof(ResourceIDAttribute), true);

                if (attrs.Length == 0)
                {
                    continue;
                }

                ResourceIDAttribute attr = attrs.First() as ResourceIDAttribute;
                readers.Add(attr.ID, item);
            }
        }

        public static IResourceBlock CreateReader(string resourceID, PsdReader reader, long length)
        {
            IResourceBlock resourceBlock;
            Type readerType = typeof(EmptyResource);

            if (readers.ContainsKey(resourceID) == true)
            {
                readerType = readers[resourceID];
                resourceBlock = TypeDescriptor.CreateInstance(null, readerType, new Type[] { typeof(PsdReader), typeof(long), }, new object[] { reader, length, }) as IResourceBlock;
            }
            else
            {
                var empty = new EmptyResource(reader, length);
                empty.Id = resourceID;
                resourceBlock = empty;
            }

            return resourceBlock;
        }

        public static string GetDisplayName(Type type)
        {
            var attrs = type.GetCustomAttributes(typeof(ResourceIDAttribute), true);

            ResourceIDAttribute attr = attrs.First() as ResourceIDAttribute;
            return attr.DisplayName;
        }

        public static string GetDisplayName(string resourceID)
        {
            if (readers.ContainsKey(resourceID) == true)
            {
                return GetDisplayName(readers[resourceID]);
            }

            return resourceID;
        }
    }
}
