using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using DICUI.Utilities;

namespace DICUI.Data
{
    public abstract class BaseParameters
    {
        /// <summary>
        /// Path to the executable
        /// </summary>
        public string ExecutablePath { get; set; }

        /// <summary>
        /// Program that this set of parameters represents
        /// </summary>
        public InternalProgram InternalProgram { get; set; }

        /// <summary>
        /// Process to track external program
        /// </summary>
        private Process process;

        /// <summary>
        /// Populate a Parameters object from a param string
        /// </summary>
        /// <param name="parameters">String possibly representing a set of parameters</param>
        public BaseParameters(string parameters)
        {
            // If any parameters are not valid, wipe out everything
            if (!ValidateAndSetParameters(parameters))
            {
                ResetValues();
            }
        }

        /// <summary>
        /// Generate parameters based on a set of known inputs
        /// </summary>
        /// <param name="system">KnownSystem value to use</param>
        /// <param name="type">MediaType value to use</param>
        /// <param name="driveLetter">Drive letter to use</param>
        /// <param name="filename">Filename to use</param>
        /// <param name="driveSpeed">Drive speed to use</param>
        /// <param name="paranoid">Enable paranoid mode (safer dumping)</param>
        /// <param name="quietMode">Enable quiet mode (no beeps)</param>
        /// <param name="retryCount">User-defined reread count</param>
        public BaseParameters(KnownSystem? system, MediaType? type, char driveLetter, string filename, int? driveSpeed, bool paranoid, bool quietMode, int retryCount)
        {
            SetDefaultParameters(system, type, driveLetter, filename, driveSpeed, paranoid, retryCount);
        }

        /// <summary>
        /// Blindly generate a parameter string based on the inputs
        /// </summary>
        /// <returns>Correctly formatted parameter string, null on error</returns>
        public abstract string GenerateParameters();

        /// <summary>
        /// Get the input path from the implementation
        /// </summary>
        /// <returns>String representing the path, null on error</returns>
        public abstract string InputPath();

        /// <summary>
        /// Get the output path from the implementation
        /// </summary>
        /// <returns>String representing the path, null on error</returns>
        public abstract string OutputPath();

        /// <summary>
        /// Get the processing speed from the implementation
        /// </summary>
        /// <returns>int? representing the speed, null on error</returns>
        public abstract int? GetSpeed();

        /// <summary>
        /// Set the processing speed int the implementation
        /// </summary>
        /// <param name="speed">int? representing the speed</param>
        public abstract void SetSpeed(int? speed);

        /// <summary>
        /// Get the MediaType from the current set of parameters
        /// </summary>
        /// <returns>MediaType value if successful, null on error</returns>
        public abstract MediaType? GetMediaType();

        /// <summary>
        /// Gets if the current command is considered a dumping command or not
        /// </summary>
        /// <returns>True if it's a dumping command, false otherwise</returns>
        public abstract bool IsDumpingCommand();

        /// <summary>
        /// Returns if the current Parameter object is valid
        /// </summary>
        /// <returns></returns>
        public bool IsValid()
        {
            return GenerateParameters() != null;
        }

        /// <summary>
        /// Reset all special variables to have default values
        /// </summary>
        protected abstract void ResetValues();

        /// <summary>
        /// Set default parameters for a given system and media type
        /// </summary>
        /// <param name="system">KnownSystem value to use</param>
        /// <param name="type">MediaType value to use</param>
        /// <param name="driveLetter">Drive letter to use</param>
        /// <param name="filename">Filename to use</param>
        /// <param name="driveSpeed">Drive speed to use</param>
        /// <param name="paranoid">Enable paranoid mode (safer dumping)</param>
        /// <param name="retryCount">User-defined reread count</param>
        protected abstract void SetDefaultParameters(
            KnownSystem? system,
            MediaType? type,
            char driveLetter,
            string filename,
            int? driveSpeed,
            bool paranoid,
            int retryCount);

        /// <summary>
        /// Scan a possible parameter string and populate whatever possible
        /// </summary>
        /// <param name="parameters">String possibly representing parameters</param>
        /// <returns></returns>
        protected abstract bool ValidateAndSetParameters(string parameters);

        /// <summary>
        /// Validate if all required output files exist
        /// </summary>
        /// <param name="basePath">Base filename and path to use for checking</param>
        /// <param name="system">KnownSystem type representing the media</param>
        /// <param name="type">MediaType type representing the media</param>
        /// <returns></returns>
        public abstract bool CheckAllOutputFilesExist(string basePath, KnownSystem? system, MediaType? type);

        /// <summary>
        /// Generate a SubmissionInfo for the output files
        /// </summary>
        /// <param name="submissionInfo">Base submission info to fill in specifics for</param>
        /// <param name="basePath">Base filename and path to use for checking</param>
        /// <param name="system">KnownSystem type representing the media</param>
        /// <param name="type">MediaType type representing the media</param>
        /// <param name="drive">Drive representing the disc to get information from</param>
        public abstract void GenerateSubmissionInfo(SubmissionInfo submissionInfo, string basePath, KnownSystem? system, MediaType? type, Drive drive);

        /// <summary>
        /// Run internal program
        /// </summary>
        public void ExecuteInternalProgram()
        {
            process = new Process()
            {
                StartInfo = new ProcessStartInfo()
                {
                    FileName = ExecutablePath,
                    Arguments = GenerateParameters() ?? "",
                },
            };

            process.Start();
            process.WaitForExit();
        }

        /// <summary>
        /// Run internal program async with an input set of parameters
        /// </summary>
        /// <param name="parameters"></param>
        /// <returns>Standard output from commandline window</returns>
        public async Task<string> ExecuteInternalProgram(BaseParameters parameters)
        {
            Process childProcess;
            string output = await Task.Run(() =>
            {
                childProcess = new Process()
                {
                    StartInfo = new ProcessStartInfo()
                    {
                        FileName = parameters.ExecutablePath,
                        Arguments = parameters.GenerateParameters(),
                        CreateNoWindow = true,
                        UseShellExecute = false,
                        RedirectStandardInput = true,
                        RedirectStandardOutput = true,
                    },
                };
                childProcess.Start();
                childProcess.WaitForExit(1000);

                // Just in case, we want to push a button 5 times to clear any errors
                for (int i = 0; i < 5; i++)
                    childProcess.StandardInput.WriteLine("Y");

                string stdout = childProcess.StandardOutput.ReadToEnd();
                childProcess.Dispose();
                return stdout;
            });

            return output;
        }

        /// <summary>
        /// Cancel an in-progress dumping process
        /// </summary>
        public void KillInternalProgram()
        {
            try
            {
                if (process != null && !process.HasExited)
                    process.Kill();
            }
            catch
            { }
        }

        /// <summary>
        /// Returns whether or not the selected item exists
        /// </summary>
        /// <param name="parameters">List of parameters to check against</param>
        /// <param name="index">Current index</param>
        /// <returns>True if the next item exists, false otherwise</returns>
        protected bool DoesExist(List<string> parameters, int index)
        {
            if (index >= parameters.Count)
                return false;

            return true;
        }

        /// <summary>
        /// Get the full lines from the input file, if possible
        /// </summary>
        /// <param name="filename">file location</param>
        /// <param name="binary">True if should read as binary, false otherwise (default)</param>
        /// <returns>Full text of the file, null on error</returns>
        protected string GetFullFile(string filename, bool binary = false)
        {
            // If the file doesn't exist, we can't get info from it
            if (!File.Exists(filename))
                return null;

            // If we're reading as binary
            if (binary)
            {
                string hex = string.Empty;
                using (BinaryReader br = new BinaryReader(File.OpenRead(filename)))
                {
                    while (br.BaseStream.Position < br.BaseStream.Length)
                    {
                        hex += Convert.ToString(br.ReadByte(), 16);
                    }
                }
                return hex;
            }

            return string.Join("\n", File.ReadAllLines(filename));
        }

        /// <summary>
        /// Returns whether a string is a flag (starts with '/')
        /// </summary>
        /// <param name="parameter">String value to check</param>
        /// <returns>True if it's a flag, false otherwise</returns>
        protected bool IsFlag(string parameter)
        {
            if (parameter.Trim('\"').StartsWith("/"))
                return true;

            return false;
        }

        /// <summary>
        /// Returns whether a string is a valid drive letter
        /// </summary>
        /// <param name="parameter">String value to check</param>
        /// <returns>True if it's a valid drive letter, false otherwise</returns>
        protected bool IsValidDriveLetter(string parameter)
        {
            if (!Regex.IsMatch(parameter, @"^[A-Z]:?\\?$"))
                return false;

            return true;
        }

        /// <summary>
        /// Returns whether a string is a valid bool
        /// </summary>
        /// <param name="parameter">String value to check</param>
        /// <returns>True if it's a valid bool, false otherwise</returns>
        protected bool IsValidBool(string parameter)
        {
            return bool.TryParse(parameter, out bool temp);
        }

        /// <summary>
        /// Returns whether a string is a valid byte
        /// </summary>
        /// <param name="parameter">String value to check</param>
        /// <param name="lowerBound">Lower bound (>=)</param>
        /// <param name="upperBound">Upper bound (<=)</param>
        /// <returns>True if it's a valid byte, false otherwise</returns>
        protected bool IsValidInt8(string parameter, sbyte lowerBound = -1, sbyte upperBound = -1)
        {
            if (!sbyte.TryParse(parameter, out sbyte temp))
                return false;
            else if (lowerBound != -1 && temp < lowerBound)
                return false;
            else if (upperBound != -1 && temp > upperBound)
                return false;

            return true;
        }

        /// <summary>
        /// Returns whether a string is a valid Int16
        /// </summary>
        /// <param name="parameter">String value to check</param>
        /// <param name="lowerBound">Lower bound (>=)</param>
        /// <param name="upperBound">Upper bound (<=)</param>
        /// <returns>True if it's a valid Int16, false otherwise</returns>
        protected bool IsValidInt16(string parameter, short lowerBound = -1, short upperBound = -1)
        {
            if (!short.TryParse(parameter, out short temp))
                return false;
            else if (lowerBound != -1 && temp < lowerBound)
                return false;
            else if (upperBound != -1 && temp > upperBound)
                return false;

            return true;
        }

        /// <summary>
        /// Returns whether a string is a valid Int32
        /// </summary>
        /// <param name="parameter">String value to check</param>
        /// <param name="lowerBound">Lower bound (>=)</param>
        /// <param name="upperBound">Upper bound (<=)</param>
        /// <returns>True if it's a valid Int32, false otherwise</returns>
        protected bool IsValidInt32(string parameter, int lowerBound = -1, int upperBound = -1)
        {
            if (!int.TryParse(parameter, out int temp))
                return false;
            else if (lowerBound != -1 && temp < lowerBound)
                return false;
            else if (upperBound != -1 && temp > upperBound)
                return false;

            return true;
        }

        /// <summary>
        /// Returns whether a string is a valid Int64
        /// </summary>
        /// <param name="parameter">String value to check</param>
        /// <param name="lowerBound">Lower bound (>=)</param>
        /// <param name="upperBound">Upper bound (<=)</param>
        /// <returns>True if it's a valid Int64, false otherwise</returns>
        protected bool IsValidInt64(string parameter, long lowerBound = -1, long upperBound = -1)
        {
            if (!long.TryParse(parameter, out long temp))
                return false;
            else if (lowerBound != -1 && temp < lowerBound)
                return false;
            else if (upperBound != -1 && temp > upperBound)
                return false;

            return true;
        }
    }
}