using System;
using System.Collections.Generic;
using System.IO;

using SBRL.Utilities;
using SBRL.SimpleTurtle;

namespace SBRL.Algorithms.LSystem
{
	class MainClass
	{
		public static void Main(string[] args)
		{
			string inputFilename = string.Empty;
			string outputDirectory = string.Empty;
			int startingGeneration = 0;
			int generations = 5;
			int stepCount = 25;

			for (int i = 0; i < args.Length; i++)
			{
				switch (args[i].ToLower())
				{
					case "--help":
						Console.WriteLine(EmbeddedFiles.ReadAllText("SimpleTurtle.Help.txt"));
						return;

					case "--input-file":
					case "-i":
						inputFilename = args[++i];
						break;
					case "--output-dir":
					case "-o":
						outputDirectory = args[++i];
						break;
					case "--skip-gen":
					case "-s":
						startingGeneration = int.Parse(args[++i]);
						break;
					case "--count":
					case "-c":
						generations = int.Parse(args[++i]);
						break;
					case "--step-dist":
					case "-d":
						stepCount = int.Parse(args[++i]);
						break;
				}
			}

			StreamReader source;
			if (inputFilename == string.Empty)
				source = new StreamReader(Console.OpenStandardInput());
			else
				source = new StreamReader(inputFilename);

			if (outputDirectory == string.Empty) {
				if (inputFilename == string.Empty)
					outputDirectory = "./l-system";
				else
					outputDirectory = inputFilename.Substring(0, inputFilename.LastIndexOf("."));
			}

			// Normalise & create the output directory
			outputDirectory = outputDirectory.TrimEnd('/') + "/";
			if(!Directory.Exists(outputDirectory))
				Directory.CreateDirectory(outputDirectory);

			LSystemEngine lsystem = LSystemEngine.FromStream(source);
			foreach (KeyValuePair<string, string> kvp in lsystem.Definitions)
			{
				Console.WriteLine("Setting {0} to {1}.", kvp.Key, kvp.Value);
			}
			Turtle turtle = new Turtle();

			Timer gentimer = Timer.GetStarted(), stagetimer = Timer.GetStarted();
			for (int i = startingGeneration; i < generations; i++)
			{
				stagetimer.Reset(); gentimer.Reset();

				Console.Write($"Generation {i}: ");
				turtle.ApplyDefinitions(lsystem.Definitions);
				turtle.MovementStep = stepCount;
				turtle.Commands(lsystem.CurrentGeneration);
				turtle.Draw($"{outputDirectory}lsystem_generation_{i}.png");

				Console.Write("{0:0.000000}s draw", stagetimer.GetElapsedSeconds());
				stagetimer.Reset();

				// ----------

				lsystem.Simulate();

				Console.Write(", {0:0.000000}s simulation", stagetimer.GetElapsedSeconds());
				stagetimer.Reset();

				// ----------

				File.WriteAllText($"{outputDirectory}lsystem_generation_{i}.txt", lsystem.CurrentGeneration);

				Console.WriteLine(
					", {0:0.000000}s textoutput - {1:0.000000}s total",
					stagetimer.GetElapsedSeconds(),
					gentimer.GetElapsedSeconds()
				);
			}

			//Turtle turtle = new Turtle();
			//turtle.Commands(Console.ReadLine());
			//turtle.Draw("turtleImage.png");
		}
	}
}