using System;
using System.IO;
using System.Text;
using System.Reflection;
using System.Diagnostics;
using System.Runtime.InteropServices;

namespace Woodpecker.Core
{
    /// <summary>
    /// Provides logging, file, environment and minor string manipulation actions.
    /// </summary>
    public static class IO
    {
        #region DLL Imports
        [DllImport("kernel32")]
        private static extern long WritePrivateProfileString(string section, string key, string val, string filePath);
        [DllImport("kernel32")]
        private static extern int GetPrivateProfileString(string section, string key, string def, StringBuilder retVal, int size, string filePath);
        #endregion
        
        #region Logging
        /// <summary>
        /// Represents five log importancies for logging actions.
        /// </summary>
        public enum logImportancies { Important = 3, Error = 2, Warning = 1, Info = 0, Debug = -1};
        /// <summary>
        /// The minimum importancy of actions, in order to be logged.
        /// </summary>
        public static logImportancies minimumLogImportancy = logImportancies.Debug;
        /// <summary>
        /// The minimum importancy of logged actions, in order to be written to logfile.
        /// </summary>
        public static logImportancies minimumWriteLogImportancy = logImportancies.Warning;
        /// <summary>
        /// Indicates if logs have to be written to file. Only logs important enough will be logged.
        /// </summary>
        public static bool writeLogsToFile = true;

        public static void PrintLine(string Text, logImportancies Importancy)
        {
            if ((int)Importancy >= (int)minimumLogImportancy)
            {
                string Now = DateTime.Now.ToLongTimeString() + ":" + DateTime.Now.Millisecond;
                StackFrame _SF = new StackTrace().GetFrame(1);
                Console.Write("[" + Now + "] [Importancy: " + (int)Importancy + " [" + Importancy.ToString() + "]] [");
                
                if (Importancy == logImportancies.Error)
                    Console.ForegroundColor = ConsoleColor.Red;
                else
                    Console.ForegroundColor = ConsoleColor.Green;

                Console.Write(_SF.GetMethod().ReflectedType.Name + "." + _SF.GetMethod().Name);
                Console.ForegroundColor = ConsoleColor.Gray;
                Console.Write("] » ");
                
                if (Importancy == logImportancies.Error)
                    Console.ForegroundColor = ConsoleColor.DarkRed;
                else
                    Console.ForegroundColor = ConsoleColor.DarkGreen;

                Console.WriteLine(Text);
                Console.ForegroundColor = ConsoleColor.Gray;

                if (writeLogsToFile && (int)Importancy >= (int)minimumWriteLogImportancy)
                {
                    TextWriter Writer = new StreamWriter(workingDirectory + "/" + DateTime.Now.ToShortDateString() + ".txt", true);
                    Writer.WriteLine("Time: " + DateTime.Now.ToLongTimeString());
                    Writer.WriteLine("Importancy: " + Importancy.ToString() + " (" + (int)Importancy + ")");
                    Writer.WriteLine("Assembly: " + _SF.GetMethod().ReflectedType.Name);
                    Writer.WriteLine("Method: " + _SF.GetMethod().Name);
                    Writer.WriteLine("Description: " + Text);
                    Writer.WriteLine("");
                    Writer.Flush();
                    Writer.Close();
                }
            }
        }
        #endregion

        #region Filesystem
        /// <summary>
        /// Returns the directory of the executeable (without backslash at end) as a string.
        /// </summary>
        public static string workingDirectory
        {
            get
            {
                return Path.GetDirectoryName(Assembly.GetExecutingAssembly().GetName().CodeBase).Substring(6);
            }
        }
        /// <summary>
        /// Returns the value of a private profile string in a textfile as a string.
        /// </summary>
        /// <param name="iniSection">The section where the value is located in.</param>
        /// <param name="iniKey">The key of the value.</param>
        /// <param name="iniLocation">The location of the textfile.</param>
        public static string readINI(string iniSection, string iniKey, string iniLocation)
        {
            StringBuilder _TMP = new StringBuilder(255);
            try
            {
                int i = GetPrivateProfileString(iniSection, iniKey, "", _TMP, 255, iniLocation);
                return _TMP.ToString();
            }
            catch { return ""; }
        }
        /// <summary>
        /// Updates a value of a key in a textfile using WritePrivateProfileString.
        /// </summary>
        /// <param name="iniSection">The section where the key to update is located in.</param>
        /// <param name="iniKey">The key to update.</param>
        /// <param name="iniValue">The new value for the key.</param>
        /// <param name="iniLocation">The location of the textfile.</param>
        public static void writeINI(string iniSection, string iniKey, string iniValue, string iniLocation)
        {
            WritePrivateProfileString(iniSection, iniKey, iniValue, iniLocation);
        }
        /// <summary>
        /// Returns a bool, which indicates if the specified path leads to a file.
        /// </summary>
        /// <param name="fileLocation">The full location of the file.</param>
        public static bool fileExists(string fileLocation)
        {
            return File.Exists(fileLocation);
        }
        #endregion
    }
}