// /***************************************************************************
// The Disc Image Chef
// ----------------------------------------------------------------------------
//
// Filename       : Analyze.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Verbs.
//
// --[ Description ] ----------------------------------------------------------
//
//     Implements the 'analyze' verb.
//
// --[ License ] --------------------------------------------------------------
//
//     This program is free software: you can redistribute it and/or modify
//     it under the terms of the GNU General Public License as
//     published by the Free Software Foundation, either version 3 of the
//     License, or (at your option) any later version.
//
//     This program is distributed in the hope that it will be useful,
//     but WITHOUT ANY WARRANTY; without even the implied warranty of
//     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//     GNU General Public License for more details.
//
//     You should have received a copy of the GNU General Public License
//     along with this program.  If not, see <http://www.gnu.org/licenses/>.
//
// ----------------------------------------------------------------------------
// Copyright © 2011-2019 Natalia Portillo
// ****************************************************************************/

using System;
using System.Collections.Generic;
using System.Text;
using DiscImageChef.CommonTypes;
using DiscImageChef.CommonTypes.Enums;
using DiscImageChef.CommonTypes.Interfaces;
using DiscImageChef.Console;
using DiscImageChef.Core;
using Mono.Options;

namespace DiscImageChef.Commands
{
    class AnalyzeCommand : Command
    {
        string encodingName;
        string inputFile;
        bool   searchForFilesystems = true;
        bool   searchForPartitions  = true;
        bool   showHelp;

        public AnalyzeCommand() : base("analyze",
                                       "Analyzes a disc image and searches for partitions and/or filesystems.")
        {
            Options = new OptionSet
            {
                $"{MainClass.AssemblyTitle} {MainClass.AssemblyVersion?.InformationalVersion}",
                $"{MainClass.AssemblyCopyright}",
                "",
                $"usage: DiscImageChef {Name} [OPTIONS] imagefile",
                "",
                Help,
                {"encoding|e=", "Name of character encoding to use.", s => encodingName           = s},
                {"filesystems|f", "Searches and analyzes filesystems.", b => searchForFilesystems = b != null},
                {"partitions|p", "Searches and interprets partitions.", b => searchForPartitions  = b != null},
                {"help|h|?", "Show this message and exit.", v => showHelp                         = v != null}
            };
        }

        public override int Invoke(IEnumerable<string> arguments)
        {
            List<string> extra = Options.Parse(arguments);

            if(showHelp)
            {
                Options.WriteOptionDescriptions(CommandSet.Out);
                return (int)ErrorNumber.HelpRequested;
            }

            MainClass.PrintCopyright();
            if(MainClass.Debug) DicConsole.DebugWriteLineEvent     += System.Console.Error.WriteLine;
            if(MainClass.Verbose) DicConsole.VerboseWriteLineEvent += System.Console.WriteLine;
            Statistics.AddCommand("analyze");

            if(extra.Count > 1)
            {
                DicConsole.ErrorWriteLine("Too many arguments.");
                return (int)ErrorNumber.UnexpectedArgumentCount;
            }

            if(extra.Count == 0)
            {
                DicConsole.ErrorWriteLine("Missing input image.");
                return (int)ErrorNumber.MissingArgument;
            }

            inputFile = extra[0];

            DicConsole.DebugWriteLine("Analyze command", "--debug={0}",       MainClass.Debug);
            DicConsole.DebugWriteLine("Analyze command", "--encoding={0}",    encodingName);
            DicConsole.DebugWriteLine("Analyze command", "--filesystems={0}", searchForFilesystems);
            DicConsole.DebugWriteLine("Analyze command", "--input={0}",       inputFile);
            DicConsole.DebugWriteLine("Analyze command", "--partitions={0}",  searchForPartitions);
            DicConsole.DebugWriteLine("Analyze command", "--verbose={0}",     MainClass.Verbose);

            FiltersList filtersList = new FiltersList();
            IFilter     inputFilter = filtersList.GetFilter(inputFile);

            if(inputFilter == null)
            {
                DicConsole.ErrorWriteLine("Cannot open specified file.");
                return (int)ErrorNumber.CannotOpenFile;
            }

            Encoding encoding = null;

            if(encodingName != null)
                try
                {
                    encoding = Claunia.Encoding.Encoding.GetEncoding(encodingName);
                    if(MainClass.Verbose) DicConsole.VerboseWriteLine("Using encoding for {0}.", encoding.EncodingName);
                }
                catch(ArgumentException)
                {
                    DicConsole.ErrorWriteLine("Specified encoding is not supported.");
                    return (int)ErrorNumber.EncodingUnknown;
                }

            PluginBase plugins = GetPluginBase.Instance;

            bool checkraw = false;

            try
            {
                IMediaImage imageFormat = ImageFormat.Detect(inputFilter);

                if(imageFormat == null)
                {
                    DicConsole.WriteLine("Image format not identified, not proceeding with analysis.");
                    return (int)ErrorNumber.UnrecognizedFormat;
                }

                if(MainClass.Verbose)
                    DicConsole.VerboseWriteLine("Image format identified by {0} ({1}).", imageFormat.Name,
                                                imageFormat.Id);
                else DicConsole.WriteLine("Image format identified by {0}.", imageFormat.Name);
                DicConsole.WriteLine();

                try
                {
                    if(!imageFormat.Open(inputFilter))
                    {
                        DicConsole.WriteLine("Unable to open image format");
                        DicConsole.WriteLine("No error given");
                        return (int)ErrorNumber.CannotOpenFormat;
                    }

                    if(MainClass.Verbose)
                    {
                        ImageInfo.PrintImageInfo(imageFormat);
                        DicConsole.WriteLine();
                    }

                    Statistics.AddMediaFormat(imageFormat.Format);
                    Statistics.AddMedia(imageFormat.Info.MediaType, false);
                    Statistics.AddFilter(inputFilter.Name);
                }
                catch(Exception ex)
                {
                    DicConsole.ErrorWriteLine("Unable to open image format");
                    DicConsole.ErrorWriteLine("Error: {0}", ex.Message);
                    DicConsole.DebugWriteLine("Analyze command", "Stack trace: {0}", ex.StackTrace);
                    return (int)ErrorNumber.CannotOpenFormat;
                }

                List<string> idPlugins;
                IFilesystem  plugin;
                string       information;
                if(searchForPartitions)
                {
                    List<Partition> partitions = Core.Partitions.GetAll(imageFormat);
                    Core.Partitions.AddSchemesToStats(partitions);

                    if(partitions.Count == 0)
                    {
                        DicConsole.DebugWriteLine("Analyze command", "No partitions found");
                        if(!searchForFilesystems)
                        {
                            DicConsole.WriteLine("No partitions founds, not searching for filesystems");
                            return (int)ErrorNumber.NothingFound;
                        }

                        checkraw = true;
                    }
                    else
                    {
                        DicConsole.WriteLine("{0} partitions found.", partitions.Count);

                        for(int i = 0; i < partitions.Count; i++)
                        {
                            DicConsole.WriteLine();
                            DicConsole.WriteLine("Partition {0}:",      partitions[i].Sequence);
                            DicConsole.WriteLine("Partition name: {0}", partitions[i].Name);
                            DicConsole.WriteLine("Partition type: {0}", partitions[i].Type);
                            DicConsole.WriteLine("Partition start: sector {0}, byte {1}", partitions[i].Start,
                                                 partitions[i].Offset);
                            DicConsole.WriteLine("Partition length: {0} sectors, {1} bytes", partitions[i].Length,
                                                 partitions[i].Size);
                            DicConsole.WriteLine("Partition scheme: {0}", partitions[i].Scheme);
                            DicConsole.WriteLine("Partition description:");
                            DicConsole.WriteLine(partitions[i].Description);

                            if(!searchForFilesystems) continue;

                            DicConsole.WriteLine("Identifying filesystem on partition");

                            Core.Filesystems.Identify(imageFormat, out idPlugins, partitions[i]);
                            if(idPlugins.Count      == 0) DicConsole.WriteLine("Filesystem not identified");
                            else if(idPlugins.Count > 1)
                            {
                                DicConsole.WriteLine($"Identified by {idPlugins.Count} plugins");

                                foreach(string pluginName in idPlugins)
                                    if(plugins.PluginsList.TryGetValue(pluginName, out plugin))
                                    {
                                        DicConsole.WriteLine($"As identified by {plugin.Name}.");
                                        plugin.GetInformation(imageFormat, partitions[i], out information, encoding);
                                        DicConsole.Write(information);
                                        Statistics.AddFilesystem(plugin.XmlFsType.Type);
                                    }
                            }
                            else
                            {
                                plugins.PluginsList.TryGetValue(idPlugins[0], out plugin);
                                if(plugin == null) continue;

                                DicConsole.WriteLine($"Identified by {plugin.Name}.");
                                plugin.GetInformation(imageFormat, partitions[i], out information, encoding);
                                DicConsole.Write("{0}", information);
                                Statistics.AddFilesystem(plugin.XmlFsType.Type);
                            }
                        }
                    }
                }

                if(checkraw)
                {
                    Partition wholePart = new Partition
                    {
                        Name   = "Whole device",
                        Length = imageFormat.Info.Sectors,
                        Size   = imageFormat.Info.Sectors * imageFormat.Info.SectorSize
                    };

                    Core.Filesystems.Identify(imageFormat, out idPlugins, wholePart);
                    if(idPlugins.Count      == 0) DicConsole.WriteLine("Filesystem not identified");
                    else if(idPlugins.Count > 1)
                    {
                        DicConsole.WriteLine($"Identified by {idPlugins.Count} plugins");

                        foreach(string pluginName in idPlugins)
                            if(plugins.PluginsList.TryGetValue(pluginName, out plugin))
                            {
                                DicConsole.WriteLine($"As identified by {plugin.Name}.");
                                plugin.GetInformation(imageFormat, wholePart, out information, encoding);
                                DicConsole.Write(information);
                                Statistics.AddFilesystem(plugin.XmlFsType.Type);
                            }
                    }
                    else
                    {
                        plugins.PluginsList.TryGetValue(idPlugins[0], out plugin);
                        if(plugin != null)
                        {
                            DicConsole.WriteLine($"Identified by {plugin.Name}.");
                            plugin.GetInformation(imageFormat, wholePart, out information, encoding);
                            DicConsole.Write(information);
                            Statistics.AddFilesystem(plugin.XmlFsType.Type);
                        }
                    }
                }
            }
            catch(Exception ex)
            {
                DicConsole.ErrorWriteLine($"Error reading file: {ex.Message}");
                DicConsole.DebugWriteLine("Analyze command", ex.StackTrace);
                return (int)ErrorNumber.UnexpectedException;
            }

            return (int)ErrorNumber.NoError;
        }
    }
}