using System;
using System.ComponentModel;
using System.IO;
using System.Windows.Forms;
using PDFPatcher.Common;
using PDFPatcher.Model;

namespace PDFPatcher.Functions
{
	[ToolboxItem(false)]
	public partial class OcrControl : FunctionControl, IResettableControl
	{
		OcrOptions _options;

		public override string FunctionName => "识别图像文本";

		public override System.Drawing.Bitmap IconImage => Properties.Resources.Ocr;

		public override Button DefaultButton => _ExportBookmarkButton;

		public OcrControl() {
			InitializeComponent();
			this.OnFirstLoad(OnLoad);
		}

		void OnLoad() {
			_BookmarkControl.FileDialog.Filter = Constants.FileExtensions.XmlFilter + "|" + Constants.FileExtensions.TxtFilter + "|" + Constants.FileExtensions.XmlOrTxtFilter;

			AppContext.MainForm.SetTooltip(_SourceFileControl.FileList, "需要识别文本的 PDF 源文件路径");
			AppContext.MainForm.SetTooltip(_BookmarkControl.FileList, "指定识别文本后生成的信息文件或文本文件路径，如路径为空则不输出文件");
			AppContext.MainForm.SetTooltip(_ExportBookmarkButton, "点击此按钮导出识别后的文本到文件");
			AppContext.MainForm.SetTooltip(_ImportOcrResultButton, "点击此按钮，将识别后的文本内容写入到目标 PDF 文件。");
			AppContext.MainForm.SetTooltip(_PageRangeBox, Messages.PageRanges);
			AppContext.MainForm.SetTooltip(_DetectColumnsBox, "允许将距离较远的文本合并为同一行文本");
			AppContext.MainForm.SetTooltip(_DetectContentPunctuationsBox, "将三个以上的连续标点替换成“ .... ”");
			AppContext.MainForm.SetTooltip(_CompressWhiteSpaceBox, "将三个以上连续出现的空格压缩成两个空格");
			AppContext.MainForm.SetTooltip(_OrientBox, "自动检测页面横竖置放方向");
			AppContext.MainForm.SetTooltip(_StretchBox, "自动纠直倾斜的页面");
			AppContext.MainForm.SetTooltip(_OutputOriginalOcrResultBox, "保存原始的未经过优化合并的识别结果（可用于写入 PDF 文档）");

			var lb = _OcrLangBox.Items;
			if (Processor.ModiOcr.ModiInstalled) {
				foreach (var item in Constants.Ocr.LangIDs) {
					if (Processor.ModiOcr.IsLanguageInstalled(item)) {
						lb.Add(ValueHelper.MapValue(item, Constants.Ocr.LangIDs, Constants.Ocr.LangNames));
					}
				}
			}
			if (lb.Count == 0) {
				lb.Add("无");
			}
			_ExportBookmarkButton.Enabled = Processor.ModiOcr.ModiInstalled;
			if (_ExportBookmarkButton.Enabled == false) {
				AppContext.MainForm.SetTooltip(_OcrLangBox, "当前系统尚未安装识别引擎，请先安装微软 Office 文字识别引擎，再重新启动程序。");
			}
			Reload();

			var d = _BookmarkControl.FileDialog;
			d.CheckFileExists = false;
			d.CheckPathExists = false;

			if (d is SaveFileDialog sd) {
				sd.OverwritePrompt = false;
			}
		}

		public override void SetupCommand(ToolStripItem item) {
			switch (item.Name) {
				case Commands.SaveBookmark:
					item.Text = "写入PDF文件(&Q)";
					item.ToolTipText = "将识别结果写入 PDF 文件";
					EnableCommand(item, true, true);
					break;
			}
			base.SetupCommand(item);
		}

		public override void ExecuteCommand(string commandName, params string[] parameters) {
			switch (commandName) {
				case Commands.SaveBookmark:
					_ImportOcrResultButton.PerformClick();
					return;
			}
			base.ExecuteCommand(commandName, parameters);
		}

		public void Reset() {
			AppContext.Ocr = new OcrOptions();
			Reload();
		}

		public void Reload() {
			_options = AppContext.Ocr;
			_CompressWhiteSpaceBox.Checked = _options.CompressWhiteSpaces;
			_ConvertToMonoColorBox.Checked = !_options.PreserveColor;
			_DetectColumnsBox.Checked = _options.DetectColumns;
			_DetectContentPunctuationsBox.Checked = _options.DetectContentPunctuations;
			var i = Array.IndexOf(Constants.Ocr.LangIDs, _options.OcrLangID);
			_OcrLangBox.Select(i > 0 ? i : 0);
			_OrientBox.Checked = _options.OrientPage;
			_RemoveSpaceBetweenChineseBox.Checked = _options.RemoveWhiteSpacesBetweenChineseCharacters;
			_SaveOcredImageBox.Checked = !String.IsNullOrEmpty(_options.SaveOcredImagePath);
			_StretchBox.Checked = _options.StretchPage;
			_OutputOriginalOcrResultBox.Checked = _options.OutputOriginalOcrResult;
			_PrintOcrResultBox.Checked = _options.PrintOcrResult;

			_WritingDirectionBox.Select((int)_options.WritingDirection);
			_QuantitiveFactorBox.SetValue(_options.QuantitativeFactor);
		}

		void Button_Click(object sender, EventArgs e) {
			if (File.Exists(_SourceFileControl.FirstFile) == false) {
				FormHelper.ErrorBox(Messages.SourceFileNotFound);
				return;
			}
			if (sender == _ImportOcrResultButton) {
				if (FileHelper.IsPathValid(_TargetFileControl.Text) == false) {
					FormHelper.ErrorBox(Messages.TargetFileNameInvalid);
					return;
				}
				if (_BookmarkControl.Text.Length == 0) {
					FormHelper.ErrorBox("请指定识别结果文件。");
					return;
				}
			}
			//else if (String.IsNullOrEmpty (_BookmarkControl.Text)) {
			//    Common.Form.ErrorBox (Messages.InfoDocNotSpecified);
			//    return;
			//}

			AppContext.SourceFiles = _SourceFileControl.Files;
			AppContext.BookmarkFile = _BookmarkControl.Text;
			AppContext.TargetFile = _TargetFileControl.Text;
			if (_SourceFileControl.Files.Length == 1) {
				_SourceFileControl.FileList.AddHistoryItem();
				if (_BookmarkControl.Text.Length > 0) {
					_BookmarkControl.FileList.AddHistoryItem();
				}
			}
			if (sender == _ImportOcrResultButton) {
				_TargetFileControl.FileList.AddHistoryItem();
			}

			AppContext.MainForm.ResetWorker();

			SyncOptions();

			var worker = AppContext.MainForm.GetWorker();
			if (sender != _ImportOcrResultButton) {
				worker.DoWork += OcrExport;
				worker.RunWorkerAsync(new object[] {
					AppContext.SourceFiles,
					AppContext.BookmarkFile,
					_options
				});
			}
			else {
				worker.DoWork += ImportOcr;
				worker.RunWorkerAsync(new object[] {
					AppContext.SourceFiles,
					AppContext.BookmarkFile,
					AppContext.TargetFile
				});
			}
			worker.RunWorkerCompleted += Worker_Completed;
		}

		void Worker_Completed(object sender, RunWorkerCompletedEventArgs e) {
			var worker = (BackgroundWorker)sender;
			worker.RunWorkerCompleted -= Worker_Completed;
			worker.DoWork -= OcrExport;
			worker.DoWork -= ImportOcr;
		}

		void SyncOptions() {
			_options.CompressWhiteSpaces = _CompressWhiteSpaceBox.Checked;
			_options.PreserveColor = !_ConvertToMonoColorBox.Checked;
			_options.DetectColumns = _DetectColumnsBox.Checked;
			_options.DetectContentPunctuations = _DetectContentPunctuationsBox.Checked;
			_options.PageRanges = _PageRangeBox.Text;
			_options.OcrLangID = ValueHelper.MapValue(_OcrLangBox.Text, Constants.Ocr.LangNames, Constants.Ocr.LangIDs, -1);
			_options.OrientPage = _OrientBox.Checked;
			_options.OutputOriginalOcrResult = _OutputOriginalOcrResultBox.Checked;
			_options.QuantitativeFactor = (float)_QuantitiveFactorBox.Value;
			_options.PrintOcrResult = _PrintOcrResultBox.Checked;
			_options.RemoveWhiteSpacesBetweenChineseCharacters = _RemoveSpaceBetweenChineseBox.Checked;
			_options.StretchPage = _StretchBox.Checked;
			// _options.SaveOcredImagePath = String.IsNullOrEmpty (this._BookmarkControl.Text) ? null : Common.FileHelper.CombinePath (Path.GetDirectoryName (this._BookmarkControl.Text), Path.GetFileNameWithoutExtension (_BookmarkControl.Text) + Constants.FileExtensions.Tif);
			_options.WritingDirection = (WritingDirection)_WritingDirectionBox.SelectedIndex;
		}

		void OcrExport(object sender, DoWorkEventArgs e) {
			var a = e.Argument as object[];
			var files = a[0] as string[];
			var b = a[1] as string;
			var options = a[2] as OcrOptions;
			if (files.Length > 1) {
				var p = Path.GetDirectoryName(b);
				var ext = Path.GetExtension(b);
				foreach (var file in files) {
					Processor.Worker.Ocr(file, FileHelper.CombinePath(p, Path.GetFileNameWithoutExtension(file) + ext), options);
					if (AppContext.Abort) {
						return;
					}
				}
			}
			else {
				Processor.Worker.Ocr(files[0], b, options);
			}
		}

		void ImportOcr(object sender, DoWorkEventArgs e) {
			var a = e.Argument as object[];
			var files = a[0] as string[];
			var b = a[1] as string;
			var target = a[2] as string;
			if (files.Length > 1) {
				var p = Path.GetDirectoryName(b);
				var ext = Path.GetExtension(b);
				foreach (var file in files) {
					Processor.Worker.ImportOcr(file, FileHelper.CombinePath(p, Path.GetFileNameWithoutExtension(file) + ext), target);
					if (AppContext.Abort) {
						return;
					}
				}
			}
			else {
				Processor.Worker.ImportOcr(files[0], b, target);
			}
		}

		void _ImportLink_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e) {
			AppContext.MainForm.SelectFunctionList(Function.Patcher);
		}

		void ControlEvent(object sender, EventArgs e) {
			if (sender == _WritingDirectionBox) {
				_DetectColumnsBox.Enabled = _WritingDirectionBox.SelectedIndex != 0;
			}
			else if (sender == _OutputOriginalOcrResultBox) {
				_DetectColumnsBox.Enabled
					= _DetectContentPunctuationsBox.Enabled
					= _CompressWhiteSpaceBox.Enabled
					= _RemoveSpaceBetweenChineseBox.Enabled
					= !_OutputOriginalOcrResultBox.Checked;
			}
		}
	}
}