//! \file       ArcTCD1.cs
//! \date       2018 Jan 23
//! \brief      TopCat TCD1 data archive.
//
// Copyright (C) 2018 by morkt
//
// 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.Composition;
using System.IO;

namespace GameRes.Formats.TopCat
{
    [Export(typeof(ArchiveFormat))]
    public class Tcd1Opener : TcdOpener
    {
        public override string         Tag { get { return "TCD1"; } }
        public override string Description { get { return "TopCat data archive"; } }
        public override uint     Signature { get { return 0x31444354; } } // 'TCD1'
        public override bool  IsHierarchic { get { return false; } }
        public override bool      CanWrite { get { return false; } }

        public Tcd1Opener ()
        {
            Extensions = new string[] { "tcd" };
            Signatures = new uint[] { 0x31444354 };
        }

        public override ArcFile TryOpen (ArcView file)
        {
            int count = file.View.ReadInt32 (4);
            if (!IsSaneCount (count))
                return null;

            uint index_offset = file.View.ReadUInt32 (8);
            uint names_offset = file.View.ReadUInt32 (12);

            uint pos = index_offset;
            var offsets = new uint[count+1];
            for (int i = 0; i < count; ++i)
            {
                offsets[i] = file.View.ReadUInt32 (pos) - (index_offset << ((i & 7) + 8));
                pos += 4;
            }
            offsets[count] = file.View.ReadUInt32 (pos);
            var names = file.View.ReadBytes (names_offset, (uint)(file.MaxOffset - names_offset));
            var dir = new List<Entry> (count);
            int name_start = 0;
            int entry_num = 0;
            for (int i = 0; i < names.Length; ++i)
            {
                if (names[i] != 0)
                {
                    names[i] -= 0x57;
                }
                else
                {
                    var name = Encodings.cp932.GetString (names, name_start, i - name_start);
                    name_start = i+1;
                    var entry = FormatCatalog.Instance.Create<Entry> (name);
                    entry.Offset = offsets[entry_num];
                    entry.Size = offsets[entry_num+1] - offsets[entry_num];
                    if (!entry.CheckPlacement (file.MaxOffset))
                        return null;
                    dir.Add (entry);
                    ++entry_num;
                }
            }
            return new ArcFile (file, this, dir);
        }
    }
}