using System;
using System.Collections.Generic;
using System.Text;
using SabreTools.Library.Data;
using SabreTools.Library.DatItems;
using SabreTools.Library.Tools;

#if MONO
using System.IO;
#else
using Alphaleonis.Win32.Filesystem;

using FileStream = System.IO.FileStream;
using StreamReader = System.IO.StreamReader;
using StreamWriter = System.IO.StreamWriter;
#endif
using NaturalSort;

namespace SabreTools.Library.DatFiles
{
    /// <summary>
    /// Represents parsing and writing of an AttractMode DAT
    /// </summary>
    internal class AttractMode : DatFile
    {
        /// <summary>
        /// Constructor designed for casting a base DatFile
        /// </summary>
        /// <param name="datFile">Parent DatFile to copy from</param>
        public AttractMode(DatFile datFile)
            : base(datFile, cloneHeader: false)
        {
        }

        /// <summary>
        /// Parse an AttractMode DAT and return all found games within
        /// </summary>
        /// <param name="filename">Name of the file to be parsed</param>
        /// <param name="sysid">System ID for the DAT</param>
        /// <param name="srcid">Source ID for the DAT</param>
        /// <param name="keep">True if full pathnames are to be kept, false otherwise (default)</param>
        /// <param name="clean">True if game names are sanitized, false otherwise (default)</param>
        /// <param name="remUnicode">True if we should remove non-ASCII characters from output, false otherwise (default)</param>
        public override void ParseFile(
            // Standard Dat parsing
            string filename,
            int sysid,
            int srcid,

            // Miscellaneous
            bool keep,
            bool clean,
            bool remUnicode)
        {
            // Open a file reader
            Encoding enc = Utilities.GetEncoding(filename);
            StreamReader sr = new StreamReader(Utilities.TryOpenRead(filename), enc);

            sr.ReadLine(); // Skip the first line since it's the header
            while (!sr.EndOfStream)
            {
                string line = sr.ReadLine();

                /*
                The gameinfo order is as follows
                0 - game name
                1 - game description
                2 - emulator name (filename)
                3 - cloneof
                4 - year
                5 - manufacturer
                6 - category
                7 - players
                8 - rotation
                9 - control
                10 - status
                11 - displaycount
                12 - displaytype
                13 - alt romname
                14 - alt title
                15 - extra
                16 - buttons
                */

                string[] gameinfo = line.Split(';');

                Rom rom = new Rom
                {
                    Name = "-",
                    Size = Constants.SizeZero,
                    CRC = Constants.CRCZero,
                    MD5 = Constants.MD5Zero,
                    RIPEMD160 = Constants.RIPEMD160Zero,
                    SHA1 = Constants.SHA1Zero,
                    ItemStatus = ItemStatus.None,

                    MachineName = gameinfo[0],
                    MachineDescription = gameinfo[1],
                    CloneOf = gameinfo[3],
                    Year = gameinfo[4],
                    Manufacturer = gameinfo[5],
                    Comment = gameinfo[15],
                };

                // Now process and add the rom
                ParseAddHelper(rom, clean, remUnicode);
            }

            sr.Dispose();
        }

        /// <summary>
        /// Create and open an output file for writing direct from a dictionary
        /// </summary>
        /// <param name="outfile">Name of the file to write to</param>
        /// <param name="ignoreblanks">True if blank roms should be skipped on output, false otherwise (default)</param>
        /// <returns>True if the DAT was written correctly, false otherwise</returns>
        public override bool WriteToFile(string outfile, bool ignoreblanks = false)
        {
            try
            {
                Globals.Logger.User("Opening file for writing: {0}", outfile);
                FileStream fs = Utilities.TryCreate(outfile);

                // If we get back null for some reason, just log and return
                if (fs == null)
                {
                    Globals.Logger.Warning("File '{0}' could not be created for writing! Please check to see if the file is writable", outfile);
                    return false;
                }

                StreamWriter sw = new StreamWriter(fs, new UTF8Encoding(false));

                // Write out the header
                WriteHeader(sw);

                // Write out each of the machines and roms
                string lastgame = null;

                // Get a properly sorted set of keys
                List<string> keys = Keys;
                keys.Sort(new NaturalComparer());

                foreach (string key in keys)
                {
                    List<DatItem> roms = this[key];

                    // Resolve the names in the block
                    roms = DatItem.ResolveNames(roms);

                    for (int index = 0; index < roms.Count; index++)
                    {
                        DatItem item = roms[index];

                        // There are apparently times when a null rom can skip by, skip them
                        if (item.Name == null || item.MachineName == null)
                        {
                            Globals.Logger.Warning("Null rom found!");
                            continue;
                        }

                        // If we have a new game, output the beginning of the new item
                        if (lastgame == null || lastgame.ToLowerInvariant() != item.MachineName.ToLowerInvariant())
                        {
                            WriteDatItem(sw, item, ignoreblanks);
                        }

                        // If we have a "null" game (created by DATFromDir or something similar), log it to file
                        if (item.ItemType == ItemType.Rom
                            && ((Rom)item).Size == -1
                            && ((Rom)item).CRC == "null")
                        {
                            Globals.Logger.Verbose("Empty folder found: {0}", item.MachineName);

                            item.Name = (item.Name == "null" ? "-" : item.Name);
                            ((Rom)item).Size = Constants.SizeZero;
                        }

                        // Set the new data to compare against
                        lastgame = item.MachineName;
                    }
                }

                Globals.Logger.Verbose("File written!" + Environment.NewLine);
                sw.Dispose();
                fs.Dispose();
            }
            catch (Exception ex)
            {
                Globals.Logger.Error(ex.ToString());
                return false;
            }

            return true;
        }

        /// <summary>
        /// Write out DAT header using the supplied StreamWriter
        /// </summary>
        /// <param name="sw">StreamWriter to output to</param>
        /// <returns>True if the data was written, false on error</returns>
        private bool WriteHeader(StreamWriter sw)
        {
            try
            {
                string header = "#Title;Name;Emulator;CloneOf;Year;Manufacturer;Category;Players;Rotation;Control;Status;DisplayCount;DisplayType;AltRomname;AltTitle;Extra;Buttons\n";

                // Write the header out
                sw.Write(header);
                sw.Flush();
            }
            catch (Exception ex)
            {
                Globals.Logger.Error(ex.ToString());
                return false;
            }

            return true;
        }

        /// <summary>
        /// Write out Game start using the supplied StreamWriter
        /// </summary>
        /// <param name="sw">StreamWriter to output to</param>
        /// <param name="rom">DatItem object to be output</param>
        /// <param name="ignoreblanks">True if blank roms should be skipped on output, false otherwise (default)</param>
        /// <returns>True if the data was written, false on error</returns>
        private bool WriteDatItem(StreamWriter sw, DatItem rom, bool ignoreblanks = false)
        {
            // If we are in ignore blanks mode AND we have a blank (0-size) rom, skip
            if (ignoreblanks
                && (rom.ItemType == ItemType.Rom
                && (((Rom)rom).Size == 0 || ((Rom)rom).Size == -1)))
            {
                return true;
            }

            try
            {
                // No game should start with a path separator
                if (rom.MachineName.StartsWith(Path.DirectorySeparatorChar.ToString()))
                {
                    rom.MachineName = rom.MachineName.Substring(1);
                }

                string state = (!ExcludeFields[(int)Field.MachineName] ? rom.MachineName : "") + ";"
                            + (!ExcludeFields[(int)Field.Description] ? rom.MachineDescription : "") + ";"
                            + FileName + ";"
                            + (!ExcludeFields[(int)Field.CloneOf] ? rom.CloneOf : "") + ";"
                            + (!ExcludeFields[(int)Field.Year] ? rom.Year : "") + ";"
                            + (!ExcludeFields[(int)Field.Manufacturer] ? rom.Manufacturer : "") + ";"
                            /* + rom.Category */ + ";"
                            /* + rom.Players */ + ";"
                            /* + rom.Rotation */ + ";"
                            /* + rom.Control */ + ";"
                            /* + rom.Status */ + ";"
                            /* + rom.DisplayCount */ + ";"
                            /* + rom.DisplayType */ + ";"
                            /* + rom.AltRomname */ + ";"
                            /* + rom.AltTitle */ + ";"
                            + (!ExcludeFields[(int)Field.Comment] ? rom.Comment : "") + ";"
                            /* + rom.Buttons */ + "\n";

                sw.Write(state);
                sw.Flush();
            }
            catch (Exception ex)
            {
                Globals.Logger.Error(ex.ToString());
                return false;
            }

            return true;
        }
    }
}