using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Reflection;

/*
	Compiled with
	C:\Windows\Microsoft.NET\Framework\v2.0.50727\csc.exe /t:exe /out:gm_pdf.exe gm_pdf.cs
*/

public class GM_PDF
{
	public static void Main()
	{
		string CurrentPath = Path.GetDirectoryName(Assembly.GetEntryAssembly().Location);
		string[] FullPdfFiles = Directory.GetFiles(CurrentPath, "*.pdf", SearchOption.TopDirectoryOnly);
		List<string> FileNames = new List<string>();

		foreach (string FilePath in FullPdfFiles)
		{
			string FileName = Path.GetFileName(FilePath);
			FileName = FileName.Replace(".pdf", "");

			if (FileName != "output_gm_compiled")
			{
				FileNames.Add(FileName);
			}
		}

		int FilesLength = FileNames.Count;
		Console.WriteLine("Found " + FilesLength + " items in current directory.");

		Console.WriteLine("Processing PDF to PNG...");
		foreach (string FileName in FileNames)
		{
			Console.WriteLine("  > Processing " + FileName + ".pdf");

			ExecCli("gm convert -density 200 \"" + FileName + ".pdf\" -quality 100 -crop 1460x940+95+285 -colorspace Gray -bordercolor white -border 120x200 output_gm_" + FileName + ".png");
		}

		Console.WriteLine("Combining PNG...");
		List<string> PngFileNames = new List<string>(FileNames);
		for (int i=0; i<FilesLength; i+=2)
		{
			int NextIndex = i + 1;

			if (NextIndex < FilesLength)
			{
				string CurrentFile = "output_gm_" + FileNames[i] + ".png";
				string NextFile = "output_gm_" + FileNames[NextIndex] + ".png";

				Console.WriteLine("  > Combining " + CurrentFile + " and " + NextFile);

				ExecCli("gm convert \"" + CurrentFile + "\" \"" + NextFile + "\" -gravity South -chop 0x200 -append \"" + CurrentFile + "\"");
				PngFileNames.Remove(FileNames[NextIndex]);
				File.Delete(NextFile);
			}
		}

		Console.WriteLine("Combining PDF...");
		string FinalArg = "gm convert";
		foreach (string FileName in PngFileNames)
		{
			FinalArg += " \"output_gm_" + FileName + ".png\" ";
		}

		FinalArg += " -compress jpeg -resize 1140x -extent 1240x1753-50 -gravity center -units PixelsPerInch -density 150x150 -repage 1240x1753 output_gm_compiled.pdf";
		ExecCli(FinalArg);

		Console.WriteLine("Cleaning up...");
		foreach (string FileName in PngFileNames)
		{
			File.Delete("output_gm_" + FileName + ".png");
		}

		Console.WriteLine("Done");
		Console.ReadLine();
	}

	private static void ExecCli (string CommandString)
	{
		Process Proc = new Process();
		ProcessStartInfo ProcInfo = new ProcessStartInfo();
		ProcInfo.WindowStyle = ProcessWindowStyle.Hidden;
		ProcInfo.FileName = "cmd.exe";
		ProcInfo.Arguments = "/C " + CommandString;

		Proc.StartInfo = ProcInfo;
		Proc.Start();
		Proc.WaitForExit();

		if (Proc.ExitCode != 0)
		{
			Console.WriteLine("\n<!> Something happened.\n    The process has stopped unexpectedly from a command line execution.");
			Console.ReadLine();
			Environment.Exit(1);
		}
	}
}