/*
 * Greenshot - a free and open source screenshot tool
 * Copyright (C) 2007-2016 Thomas Braun, Jens Klingen, Robin Krom
 * 
 * For more information see: http://getgreenshot.org/
 * The Greenshot project is hosted on GitHub https://github.com/greenshot/greenshot
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 1 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using Greenshot.Interop;
using GreenshotOCRCommand.Modi;

namespace GreenshotOCRCommand {
	public class Program {
		private const string Usage = "<-c> | <path to image.bmp> [language] [orientimage] [straightenImage]";
		public static int Main(string[] args) {
			if (args.Length == 0) {
				Console.WriteLine(Usage);
				return -1;
			}
			string filename = args[0];
			ModiLanguage language = ModiLanguage.ENGLISH;
			if (args.Length >= 2) {
				language = (ModiLanguage)Enum.Parse(typeof(ModiLanguage), args[1]);
			}
			bool orientimage = true;
			if (args.Length >= 3) {
				orientimage = bool.Parse(args[2]);
			}
			bool straightenImage = true;
			if (args.Length >= 4) {
				straightenImage = bool.Parse(args[3]);
			}
			try {
				if (File.Exists(filename) || "-c".Equals(filename)) {
					using (var document = COMWrapper.GetOrCreateInstance<IDocument>()) {
						if (document == null) {
							Console.WriteLine("MODI not installed");
							return -2;
						}
						if ("-c".Equals(filename)) {
							return 0;
						}
						document.Create(filename);
						document.OCR(language, orientimage, straightenImage);
						var modiImage = document.Images[0];
						var layout = modiImage.Layout;
						if (layout != null)
						{
#if DEBUG
							if (layout.Words != null)
							{
								foreach (var word in ToEnumerable(layout.Words))
								{
									if (word.Rects != null)
									{
										foreach (var rect in ToEnumerable(word.Rects))
										{
											Debug.WriteLine($"Rect {rect.Left},{rect.Top},{rect.Right},{rect.Bottom} - Word {word.Text} : Confidence: {word.RecognitionConfidence}");
										}
									}
								}
							}
#endif
							if (layout.Text != null)
							{
								// For for BUG-1884:
								// Although trim is done in the OCR Plugin, it does make sense in the command too.
								Console.WriteLine(layout.Text.Trim());
							}
						}
						document.Close(false);
						return 0;
					}
				}
			} catch (Exception ex) {
				Console.WriteLine(ex.Message);
			}
			return -1;
		}

		/// <summary>
		/// Helper method
		/// </summary>
		/// <returns>IEnumerable of IMiRect</returns>
		private static IEnumerable<IMiRect> ToEnumerable(IMiRects rects)
		{
			for (int i = 0; i < rects.Count; i++)
			{
				yield return rects[i];
			}
		}

		/// <summary>
		/// Helper method
		/// </summary>
		/// <returns>IEnumerable of IWord</returns>
		private static IEnumerable<IWord> ToEnumerable(IWords words)
		{
			for (int i = 0; i < words.Count; i++)
			{
				yield return words[i];
			}
		}
	}
}