//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 Ntreev.Library.Psd.Structures;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;

namespace Ntreev.Library.Psd.Readers.LayerAndMaskInformation
{
    class EmbeddedLayerBlock: LazyDataReader
    {
        public EmbeddedLayerBlock(PsdReader reader)
        {
          Init(reader, true, null);
        }

    private EmbeddedLayer embedded;

    public EmbeddedLayer EmbeddedLayer
    {
      get
      {
        ReadData();
        return embedded;
      }

      set
      {
        embedded = value;
      }
    }


    protected override long ReadLength(PsdReader reader)
        {
            return (reader.ReadInt64() + 3) & (~3);
        }

        private Uri ReadAboluteUri(PsdReader reader)
        {
            IProperties props = new StructureDescriptor(reader).Items;
            if (props.Contains("fullPath") == true)
            {
                Uri absoluteUri = new Uri(props["fullPath"] as string);
                if (File.Exists(absoluteUri.LocalPath) == true)
                    return absoluteUri;
            }

            if (props.Contains("relPath") == true)
            {
                string relativePath = props["relPath"] as string;
                Uri absoluteUri = reader.Resolver.ResolveUri(reader.Uri, relativePath);
                if (File.Exists(absoluteUri.LocalPath) == true)
                    return absoluteUri;
            }

            if (props.Contains("Nm") == true)
            {
                string name = props["Nm"] as string;
                Uri absoluteUri = reader.Resolver.ResolveUri(reader.Uri, name);
                if (File.Exists(absoluteUri.LocalPath) == true)
                    return absoluteUri;
            }

            if (props.Contains("fullPath") == true)
            {
                return new Uri(props["fullPath"] as string);
            }

            return null;
        }

        protected override void ReadData(PsdReader reader, object userData)
        {
            reader.ValidateSignature("liFE");

            int version = reader.ReadInt32();
            
            Guid id = new Guid(reader.ReadPascalString(1));
            string name = reader.ReadString();
            string type = reader.ReadType();
            string creator = reader.ReadType();

            long length = reader.ReadInt64();
            IProperties properties = reader.ReadBoolean() == true ? new StructureDescriptor(reader).Items : null;
            Uri absoluteUri = this.ReadAboluteUri(reader);

            EmbeddedLayer = new EmbeddedLayer(id, reader.Resolver, absoluteUri);
        }
    }
}
