/*

Copyright (C) 2011-2012 Jacob Dawid

This file is part of Octave.

Octave 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 3 of the License, or (at your
option) any later version.

Octave 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 Octave; see the file COPYING.  If not, see
<http://www.gnu.org/licenses/>.

*/

#ifndef FILEEDITORTAB_H
#define FILEEDITORTAB_H

#include <Qsci/qsciscintilla.h>
#include <QWidget>
#include <QCloseEvent>
#include <QFileSystemWatcher>

#include "find-dialog.h"

class file_editor;
class file_editor_tab : public QWidget
{
  Q_OBJECT
  public:
  file_editor_tab (QString directory = "");
  ~file_editor_tab ();

public slots:
  void update_window_title(bool modified);
  void handle_copy_available(bool enableCopy);
  void handle_margin_clicked (int line, int margin, Qt::KeyboardModifiers state);

  /** Tells the editor tab to react on changed settings. */
  void notice_settings ();
  /** Will initiate close if associated with the identifier tag. */
  void conditional_close (const QWidget* ID);
  /** Change to a different editor tab by identifier tag. */
  void change_editor_state (const QWidget* ID);
  /** Simply transmit file name. */
  void file_name_query (const QWidget* ID);

  void undo (const QWidget* ID);
  void redo (const QWidget* ID);
  void copy (const QWidget* ID);
  void cut (const QWidget* ID);
  void paste (const QWidget* ID);
  void save_file (const QWidget* ID);
  void save_file (const QWidget* ID, const QString& fileName, bool remove_on_success);
  void save_file_as (const QWidget* ID);
  void run_file (const QWidget* ID);
  void toggle_bookmark (const QWidget* ID);
  void next_bookmark (const QWidget* ID);
  void previous_bookmark (const QWidget* ID);
  void remove_bookmark (const QWidget* ID);

  void toggle_breakpoint (const QWidget* ID);
  void next_breakpoint (const QWidget* ID);
  void previous_breakpoint (const QWidget* ID);
  void remove_all_breakpoints (const QWidget* ID);

  void comment_selected_text (const QWidget* ID);
  void uncomment_selected_text (const QWidget* ID);
  void find (const QWidget* ID);

  void set_debugger_position (int line);

  void set_modified (bool modified = true);

  QString load_file (const QString& fileName);
  void new_file ();

  void file_has_changed (const QString& fileName);

signals:
  void file_name_changed (const QString& fileName);
  void editor_state_changed (bool copy_available, const QString& fileName);
  void tab_remove_request ();
  void add_filename_to_list (const QString& fileName);
  void mru_add_file (const QString& file_name);
  void editor_check_conflict_save (const QString& saveFileName, bool remove_on_success);
  void process_octave_code (const QString& command);

protected:
  void closeEvent (QCloseEvent *event);
  void set_file_name (const QString& fileName);

private slots:
  /** When user closes message box for reload question. */
  void handle_file_reload_answer (int decision);
  /** When user closes message box for resave question. */
  void handle_file_resave_answer (int decision);
  /** When user closes message box for modified question. */
  void handle_file_modified_answer (int decision);
  /** When user closes find_dialog box. */
  void handle_find_dialog_finished (int decision);
  /** When user closes QFileDialog box. */
  void handle_save_file_as_answer (const QString& fileName);
  void handle_save_file_as_answer_close (const QString& fileName);
  void handle_save_file_as_answer_cancel ();

private:

  struct bp_info
  {
    bp_info (const QString& p, const QString& fn, int l)
      : path (p.toStdString ()), function_name (fn.toStdString ()), line (l)
    { }

    std::string path;
    std::string function_name;
    int line;
  };

  void save_file (const QString& saveFileName, bool remove_on_success = false);
  void save_file_as (bool remove_on_success = false);
  void message_duplicate_file_name (const QString& fileName);

  void update_lexer ();
  void request_add_breakpoint (int line);
  void request_remove_breakpoint (int line);

  int check_file_modified (const QString& msg, int cancelButton);
  void do_comment_selected_text (bool comment);

  void run_file_callback (void);
  void add_breakpoint_callback (const bp_info& info);
  void remove_breakpoint_callback (const bp_info& info);
  void remove_all_breakpoints_callback (const bp_info& info);

  QsciScintilla *       _edit_area;

  QString               _file_name;
  QString               _file_name_short;

  bool                  _long_title;
  bool                  _copy_available;

  QFileSystemWatcher    _file_system_watcher;

  find_dialog *         _find_dialog;
  bool                  _find_dialog_is_visible;
  QRect                 _find_dialog_geometry;
};

#endif // FILEEDITORTAB_H