//Microsoft .NET Framework
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Reflection;

using MudEngine.GameManagement;

namespace MudEngine.FileSystem
{
    /// <summary>
    /// Handles saving and loading of engine objects
    /// </summary>
    public static class FileManager
    {
        public enum OutputFormats
        {
            XML = 0,
        }

        /// <summary>
        /// The filetype that the MUDs files will be saved as
        /// </summary>
        public static OutputFormats FileType
        {
            get;
            set;
        }

        /// <summary>
        /// Writes content out to a file.
        /// </summary>
        /// <param name="filename"></param>
        /// <param name="name"></param>
        /// <param name="value"></param>
        public static void WriteLine(String filename, String value, String name)
        {
            if (!File.Exists(filename))
            {
                FileStream s = File.Create(filename);
                s.Close();
            }

            using (StreamWriter sw = File.AppendText(filename))
            {
                StringBuilder sb = new StringBuilder();
                sb.Append(name);
                sb.Append("=");
                sb.Append(value);
                sw.WriteLine(sb.ToString());
                sw.Close();
            }
        }

        public static String GetData(String filename, String name)
        {
            if (!File.Exists(filename))
            {
                Log.Write("Error: Failed attempting to load " + filename + ". File does not exist.");
                return "No data Found." ;
            }
            foreach (String line in File.ReadAllLines(filename))
            {
                //Ignore comments
                if (line.StartsWith(";"))
                    continue;

                if (line.ToLower().StartsWith(name.ToLower()))
                    return line.Substring(name.Length + 1); //Accounts for name=value;
            }

            return "No data Found.";
        }

        public static List<String> GetCollectionData(String filename, String item)
        {
            List<String> items = new List<string>();

            foreach (String line in File.ReadAllLines(filename))
            {
                //Ignore comments
                if (line.StartsWith(";"))
                    continue;

                if (line.ToLower().StartsWith(item.ToLower()))
                    items.Add(line.Substring(item.Length + 1)); //Accounts for name=value;
            }

            return items;
        }

        /// <summary>
        /// Gets a collection of data from a file spanning 
        /// </summary>
        /// <param name="filename"></param>
        /// <param name="startingLine"></param>
        /// <param name="endingLine"></param>
        /// <returns></returns>
        public static List<String> GetDataSpan(String filename, Int32 linesToSpan)
        {
            List<String> items = new List<String>();
            Int32 currentLine = 1;

            foreach (String line in File.ReadAllLines(filename))
            {
                if (line.StartsWith(";"))
                    continue;

                items.Add(line);

                if (currentLine == linesToSpan)
                    break;
                else
                    currentLine++;
            }

            return items;
        }

        public static List<String> GetDataSpan(String filename, Int32 linesToSpan, String startingValue, Boolean spanAllSimilar)
        {
            List<String> items = new List<String>();
            String[] fileData = File.ReadAllLines(filename);
            Int32 line = 0;

            while (line <= fileData.Length - 1)
            {
                if (fileData[line].StartsWith(";"))
                    continue;
                else if (fileData[line].ToLower().StartsWith(startingValue.ToLower()))
                {
                    Boolean isComplete = false;

                    while (!isComplete)
                    {
                        Int32 startingLine = line;

                        //Exception prevention first.
                        if (line >= fileData.Length)
                        {
                            isComplete = true;
                            continue;
                        }
                        if (fileData[line].ToLower().StartsWith(startingValue.ToLower()))
                        {
                            for (Int32 i = startingLine; i != (startingLine + linesToSpan); i++)
                            {
                                String[] content = fileData[i].Split('=');
                                items.Add(content[1]);
                                line++;
                            }

                            if (!spanAllSimilar)
                                isComplete = true;
                        }
                    }
                }

                line++;
            }

            return items;
        }

        /// <summary>
        /// Returns the complete path to the specified data's save folder.
        /// </summary>
        /// <param name="DataType"></param>
        /// <returns></returns>
        public static String GetDataPath(SaveDataTypes DataType)
        {
            String assemblyPath = System.Reflection.Assembly.GetExecutingAssembly().ManifestModule.FullyQualifiedName;
            String assemblyName = System.IO.Path.GetFileName(assemblyPath);
            String installBase = assemblyPath.Substring(0, assemblyPath.Length - assemblyName.Length);

            if (DataType == SaveDataTypes.Root)
                return installBase;
            else
                return System.IO.Path.Combine(installBase, DataType.ToString());
        }

        public static String GetDataPath(String Realm, String Zone)
        {
            String assemblyPath = System.Reflection.Assembly.GetExecutingAssembly().ManifestModule.FullyQualifiedName;
            String assemblyName = System.IO.Path.GetFileName(assemblyPath);
            String installBase = assemblyPath.Substring(0, assemblyPath.Length - assemblyName.Length);
            String realmsPath = System.IO.Path.Combine(installBase, "Realms");
            String requestRealm = Path.Combine(installBase, Realm);
            String requestedRealmZones = Path.Combine(installBase, "Zones");
            String requestedZone = Path.Combine(installBase, Zone);

            return requestedZone;
        }

        public static String GetDataPath(String Realm, String Zone, String Room)
        {
            return System.IO.Path.Combine(GetDataPath(Realm, Zone), Room);
        }

        //TODO Write CopyDirectory method.
    }
}