/**
 * Steamless - Copyright (c) 2015 - 2022 atom0s [atom0s@live.com]
 *
 * This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
 * To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/4.0/ or send a letter to
 * Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.
 *
 * By using Steamless, you agree to the above license and its terms.
 *
 *      Attribution - You must give appropriate credit, provide a link to the license and indicate if changes were
 *                    made. You must do so in any reasonable manner, but not in any way that suggests the licensor
 *                    endorses you or your use.
 *
 *   Non-Commercial - You may not use the material (Steamless) for commercial purposes.
 *
 *   No-Derivatives - If you remix, transform, or build upon the material (Steamless), you may not distribute the
 *                    modified material. You are, however, allowed to submit the modified works back to the original
 *                    Steamless project in attempt to have it added to the original project.
 *
 * You may not apply legal terms or technological measures that legally restrict others
 * from doing anything the license permits.
 *
 * No warranties are given.
 */

namespace Steamless.Unpacker.Variant10.x86
{
    using API;
    using API.Events;
    using API.Model;
    using API.PE32;
    using API.Services;
    using System;
    using System.Reflection;

    [SteamlessApiVersion(1, 0)]
    public class Main : SteamlessPlugin
    {
        /// <summary>
        /// Internal logging service instance.
        /// </summary>
        private LoggingService m_LoggingService;

        /// <summary>
        /// Gets the author of this plugin.
        /// </summary>
        public override string Author => "atom0s";

        /// <summary>
        /// Gets the name of this plugin.
        /// </summary>
        public override string Name => "SteamStub Variant 1.0 Unpacker (x86)";

        /// <summary>
        /// Gets the description of this plugin.
        /// </summary>
        public override string Description => "Unpacker for the 32bit SteamStub variant 1.0.";

        /// <summary>
        /// Gets the version of this plugin.
        /// </summary>
        public override Version Version => Assembly.GetExecutingAssembly().GetName().Version;

        /// <summary>
        /// Internal wrapper to log a message.
        /// </summary>
        /// <param name="msg"></param>
        /// <param name="type"></param>
        private void Log(string msg, LogMessageType type)
        {
            this.m_LoggingService.OnAddLogMessage(this, new LogMessageEventArgs(msg, type));
        }

        /// <summary>
        /// Initialize function called when this plugin is first loaded.
        /// </summary>
        /// <param name="logService"></param>
        /// <returns></returns>
        public override bool Initialize(LoggingService logService)
        {
            this.m_LoggingService = logService;
            return true;
        }

        /// <summary>
        /// Processing function called when a file is being unpacked. Allows plugins to check the file
        /// and see if it can handle the file for its intended purpose.
        /// </summary>
        /// <param name="file"></param>
        /// <returns></returns>
        public override bool CanProcessFile(string file)
        {
            try
            {
                // Load the file..
                var f = new Pe32File(file);
                if (!f.Parse() || f.IsFile64Bit() || !f.HasSection(".bind"))
                    return false;

                // Obtain the bind section data..
                var bind = f.GetSectionData(".bind");

                // Attempt to locate the known v1.x signature..
                var variant = Pe32Helpers.FindPattern(bind, "60 81 EC 00 10 00 00 BE ?? ?? ?? ?? B9 6A");
                if (variant == -1)
                    return false;

                return true;
            }
            catch
            {
                return false;
            }
        }

        /// <summary>
        /// Processing function called to allow the plugin to process the file.
        /// </summary>
        /// <param name="file"></param>
        /// <param name="options"></param>
        /// <returns></returns>
        public override bool ProcessFile(string file, SteamlessOptions options)
        {
            // Parse the file..
            this.File = new Pe32File(file);
            if (!this.File.Parse())
                return false;

            return false;
        }

        /// <summary>
        /// Gets or sets the file being processed.
        /// </summary>
        private Pe32File File { get; set; }
    }
}