using System;
using System.Collections.Generic;
using System.Text.RegularExpressions;

namespace Console.Waterworks.Core.Models
{
    class Command
    {
        public string Name { get; set; }
        public string ClassName { get; set; }

        List<string> _arguments;
        public IEnumerable<string> Arguments
        {
            get { return _arguments; }
        }

        /*
         * Let us assume the end-user entered: [> Say "Hello, World!" 2].
         * The input entered needs to be parse and seperated.
         * This is so ClassName and Arguments can be set.
         * Once everything has been parsed, _arguments should look like the following,
         * _arguments["Hello, World!", "2"] (This will be "mirrored" in Arguments).
         * Using the example at the top of this comment block, the end result will look something like,
         * ClassName = "Say" | Arguments = ["Hello, World!", "2"]
         * This object will then be used as the guide to locate the command-method this model describes.
         */
        public Command(string input, string commandsNamespace, string className)
        {
            var splitInput = Regex.Split(input, "(?<=^[^\"]*(?:\"[^\"]*\"[^\"]*)*) (?=(?:[^\"]*\"[^\"]*\")*[^\"]*$)");
            _arguments = new List<string>();
            for (int i = 0; i < splitInput.Length; i++)
            {
                if (i == 0)
                    establishCommand(splitInput, i, className);
                else
                    establishArguments(splitInput, i);
            }
        }

        void establishCommand(string[] splitInput, int splitInputLocation, string nameOfClass)
        {
            Name = splitInput[splitInputLocation];
            ClassName = nameOfClass; // The default is "ConsoleCommands.cs"
            string[] splitCommandInput = splitInput[0].Split('.');

            // This next part is a fancy feature and will almost never be used.
            if (splitCommandInput.Length == 2)
            {
                // In short, it takes something like [> TestClass1.TestMethod2 "Hello, World"].
                // And, it isolates the "TestClass1" and TestMethod2" parts.
                ClassName = splitCommandInput[0]; // "TestClass1"
                Name = splitCommandInput[1]; // TestMethod2"
            }
        }

        void establishArguments(string[] splitInput, int splitInputLocation)
        {
            var inputArgument = splitInput[splitInputLocation];
            string argument = inputArgument;

            // This bit is just a check to see if the current part of the input is a quoted string.
            // If it is quoted text, "matches" will hold the various parts of the quote.
            var regex = new Regex("\"(.*?)\"", RegexOptions.Singleline);
            var matches = regex.Match(inputArgument);
            if (matches.Captures.Count > 0)
            {
                // Each part of the quoted text is added to "argument" one-by-one.
                // The aim is to add the quoted text as a single line.
                var captureQuotedText = new Regex("[^\"]*[^\"]");
                var quoted = captureQuotedText.Match(matches.Captures[0].Value);
                argument = quoted.Captures[0].Value;
            }
            _arguments.Add(argument);
        }
    }
}