/*
 * Copyright (C) 2018-2019 Ben Loftis <ben@harrisonconsoles.com>
 *
 * 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 2 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, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <cstdlib>
#include <cmath>
#include <algorithm>
#include <string>
#include <sstream>

#include "pbd/basename.h"
#include "pbd/enumwriter.h"
#include "pbd/file_utils.h"

#include "ardour/audioregion.h"
#include "ardour/source.h"
#include "ardour/audiofilesource.h"
#include "ardour/silentfilesource.h"
#include "ardour/smf_source.h"
#include "ardour/region_factory.h"
#include "ardour/session.h"
#include "ardour/session_directory.h"
#include "ardour/profile.h"

#include "gtkmm2ext/treeutils.h"
#include "gtkmm2ext/utils.h"

#include "widgets/choice.h"
#include "widgets/tooltips.h"

#include "audio_clock.h"
#include "context_menu_helper.h"
#include "editor.h"
#include "editing.h"
#include "editing_convert.h"
#include "keyboard.h"
#include "ardour_ui.h"
#include "gui_thread.h"
#include "actions.h"
#include "region_view.h"
#include "utils.h"
#include "editor_drag.h"
#include "main_clock.h"
#include "ui_config.h"

#include "pbd/i18n.h"

#include "editor_sources.h"

using namespace std;
using namespace ARDOUR;
using namespace ArdourWidgets;
using namespace ARDOUR_UI_UTILS;
using namespace PBD;
using namespace Gtk;
using namespace Glib;
using namespace Editing;
using Gtkmm2ext::Keyboard;

struct ColumnInfo {
	int         index;
	const char* label;
	const char* tooltip;
};

EditorSources::EditorSources (Editor* e)
	: EditorComponent (e)
	, old_focus (0)
	, tags_editable (0)
{
	_display.set_size_request (100, -1);
	_display.set_rules_hint (true);
	_display.set_name ("SourcesList");
	_display.set_fixed_height_mode (true);

	/* Try to prevent single mouse presses from initiating edits.
	   This relies on a hack in gtktreeview.c:gtk_treeview_button_press()
	*/
	_display.set_data ("mouse-edits-require-mod1", (gpointer) 0x1);

	_model = TreeStore::create (_columns);
	_model->set_sort_column (0, SORT_ASCENDING);

	/* column widths */
	int bbt_width, date_width, height;

	Glib::RefPtr<Pango::Layout> layout = _display.create_pango_layout (X_("000|000|000"));
	Gtkmm2ext::get_pixel_size (layout, bbt_width, height);

	Glib::RefPtr<Pango::Layout> layout2 = _display.create_pango_layout (X_("2018-10-14 12:12:30"));
	Gtkmm2ext::get_pixel_size (layout2, date_width, height);

	TreeViewColumn* col_name = manage (new TreeViewColumn ("", _columns.name));
	col_name->set_fixed_width (bbt_width*2);
	col_name->set_sizing (TREE_VIEW_COLUMN_FIXED);
	col_name->set_sort_column(0);

	TreeViewColumn* col_tags = manage (new TreeViewColumn ("", _columns.tags));
	col_tags->set_fixed_width (bbt_width*2);
	col_tags->set_sizing (TREE_VIEW_COLUMN_FIXED);

	TreeViewColumn* col_take_id = manage (new TreeViewColumn ("", _columns.take_id));
	col_take_id->set_fixed_width (date_width);
	col_take_id->set_sizing (TREE_VIEW_COLUMN_FIXED);
	col_take_id->set_sort_column(1);

	TreeViewColumn* col_nat_pos = manage (new TreeViewColumn ("", _columns.natural_pos));
	col_nat_pos->set_fixed_width (bbt_width);
	col_nat_pos->set_sizing (TREE_VIEW_COLUMN_FIXED);
	col_nat_pos->set_sort_column(6);

	TreeViewColumn* col_path = manage (new TreeViewColumn ("", _columns.path));
	col_path->set_fixed_width (bbt_width);
	col_path->set_sizing (TREE_VIEW_COLUMN_FIXED);
	col_path->set_sort_column(3);

	_display.append_column (*col_name);
	_display.append_column (*col_tags);
	_display.append_column (*col_take_id);
	_display.append_column (*col_nat_pos);
	_display.append_column (*col_path);

	TreeViewColumn* col;
	Gtk::Label* l;

	ColumnInfo ci[] = {
		{ 0,   _("Source"),    _("Source name, with number of channels in []'s") },
		{ 1,   _("Tags"),      _("Tags") },
		{ 2,   _("Take ID"),   _("Take ID") },
		{ 3,   _("Orig Pos"),  _("Original Position of the file on timeline, when it was recorded") },
		{ 4,   _("Path"),      _("Path (folder) of the file location") },
		{ -1, 0, 0 }
	};

	for (int i = 0; ci[i].index >= 0; ++i) {
		col = _display.get_column (ci[i].index);
		l = manage (new Label (ci[i].label));
		set_tooltip (*l, ci[i].tooltip);
		col->set_widget (*l);
		l->show ();
	}
	_display.set_model (_model);

	_display.set_headers_visible (true);
	_display.set_rules_hint ();

	/* set the color of the name field */
	TreeViewColumn* tv_col = _display.get_column(0);
	CellRendererText* renderer = dynamic_cast<CellRendererText*>(_display.get_column_cell_renderer (0));
	tv_col->add_attribute(renderer->property_text(), _columns.name);
	tv_col->add_attribute(renderer->property_foreground_gdk(), _columns.color_);

	/* Tags cell: make editable */
	CellRendererText* region_tags_cell = dynamic_cast<CellRendererText*>(_display.get_column_cell_renderer (1));
	region_tags_cell->property_editable() = true;
	region_tags_cell->signal_edited().connect (sigc::mem_fun (*this, &EditorSources::tag_edit));
	region_tags_cell->signal_editing_started().connect (sigc::mem_fun (*this, &EditorSources::tag_editing_started));

	/* right-align the Natural Pos column */
	TreeViewColumn* nat_col = _display.get_column(3);
	nat_col->set_alignment (ALIGN_RIGHT);
	renderer = dynamic_cast<CellRendererText*>(_display.get_column_cell_renderer (3));
	if (renderer) {
		renderer->property_xalign() = ( 1.0 );
	}

	/* the PATH field should expand when the pane is opened wider */
	tv_col = _display.get_column(4);
	renderer = dynamic_cast<CellRendererText*>(_display.get_column_cell_renderer (4));
	tv_col->add_attribute(renderer->property_text(), _columns.path);
	tv_col->set_expand (true);

	_display.get_selection()->set_mode (SELECTION_MULTIPLE);
	_display.add_object_drag (_columns.region.index(), "regions");
	_display.set_drag_column (_columns.name.index());

	/* setup DnD handling */

	list<TargetEntry> source_list_target_table;

	source_list_target_table.push_back (TargetEntry ("text/plain"));
	source_list_target_table.push_back (TargetEntry ("text/uri-list"));
	source_list_target_table.push_back (TargetEntry ("application/x-rootwin-drop"));

	_display.add_drop_targets (source_list_target_table);
	_display.signal_drag_data_received().connect (sigc::mem_fun(*this, &EditorSources::drag_data_received));

	_scroller.add (_display);
	_scroller.set_policy (POLICY_AUTOMATIC, POLICY_AUTOMATIC);

	_display.signal_button_press_event().connect (sigc::mem_fun(*this, &EditorSources::button_press), false);
	_change_connection = _display.get_selection()->signal_changed().connect (sigc::mem_fun(*this, &EditorSources::selection_changed));

	_scroller.signal_key_press_event().connect (sigc::mem_fun(*this, &EditorSources::key_press), false);
	_scroller.signal_focus_in_event().connect (sigc::mem_fun (*this, &EditorSources::focus_in), false);
	_scroller.signal_focus_out_event().connect (sigc::mem_fun (*this, &EditorSources::focus_out));

	_display.signal_enter_notify_event().connect (sigc::mem_fun (*this, &EditorSources::enter_notify), false);
	_display.signal_leave_notify_event().connect (sigc::mem_fun (*this, &EditorSources::leave_notify), false);

	ARDOUR_UI::instance()->primary_clock->mode_changed.connect (sigc::mem_fun(*this, &EditorSources::clock_format_changed));

	e->EditorFreeze.connect (editor_freeze_connection, MISSING_INVALIDATOR, boost::bind (&EditorSources::freeze_tree_model, this), gui_context());
	e->EditorThaw.connect (editor_thaw_connection, MISSING_INVALIDATOR, boost::bind (&EditorSources::thaw_tree_model, this), gui_context());
}

bool
EditorSources::focus_in (GdkEventFocus*)
{
	Window* win = dynamic_cast<Window*> (_scroller.get_toplevel ());

	if (win) {
		old_focus = win->get_focus ();
	} else {
		old_focus = 0;
	}

	tags_editable = 0;

	/* try to do nothing on focus in (doesn't work, hence selection_count nonsense) */
	return true;
}

bool
EditorSources::focus_out (GdkEventFocus*)
{
	if (old_focus) {
		old_focus->grab_focus ();
		old_focus = 0;
	}

	tags_editable = 0;

	return false;
}

bool
EditorSources::enter_notify (GdkEventCrossing*)
{
	if (tags_editable) {
		return true;
	}

	Keyboard::magic_widget_grab_focus ();
	return false;
}

bool
EditorSources::leave_notify (GdkEventCrossing*)
{
	if (old_focus) {
		old_focus->grab_focus ();
		old_focus = 0;
	}

	Keyboard::magic_widget_drop_focus ();
	return false;
}

void
EditorSources::set_session (ARDOUR::Session* s)
{
	SessionHandlePtr::set_session (s);

	if (s) {
		ARDOUR::RegionFactory::CheckNewRegion.connect (add_source_connection, MISSING_INVALIDATOR, boost::bind (&EditorSources::add_source, this, _1), gui_context());

		s->SourceRemoved.connect (remove_source_connection, MISSING_INVALIDATOR, boost::bind (&EditorSources::remove_weak_source, this, _1), gui_context());

		redisplay();

	} else {
		clear();
	}
}

void
EditorSources::remove_weak_source (boost::weak_ptr<ARDOUR::Source> src)
{
	boost::shared_ptr<ARDOUR::Source> source = src.lock();
	if (source) {
		remove_source (source);
	}
}

void
EditorSources::remove_source (boost::shared_ptr<ARDOUR::Source> source)
{
	TreeModel::iterator i;
	TreeModel::Children rows = _model->children();
	for (i = rows.begin(); i != rows.end(); ++i) {
		boost::shared_ptr<ARDOUR::Region> rr = (*i)[_columns.region];
		if (rr->source() == source) {
			_model->erase(i);
			break;
		}
	}
}

void
EditorSources::remove_weak_region (boost::weak_ptr<ARDOUR::Region> r)
{
	boost::shared_ptr<ARDOUR::Region> region = r.lock();
	if (!region) {
		return;
	}
	TreeModel::Children rows = _model->children();
	for (TreeModel::iterator i = rows.begin(); i != rows.end(); ++i) {
		boost::shared_ptr<ARDOUR::Region> rr = (*i)[_columns.region];
		if (rr == region) {
			_model->erase(i);
			break;
		}
	}
}

void
EditorSources::populate_row (TreeModel::Row row, boost::shared_ptr<ARDOUR::Region> region)
{
	ENSURE_GUI_THREAD (*this, &ARDOUR_UI::record_state_changed, row, region);

	if (!region) {
		return;
	}

	boost::shared_ptr<ARDOUR::Source> source = region->source(); // ToDo: is it OK to use only the first source?

	/* COLOR  (for missing files) */
	Gdk::Color c;
	bool missing_source = boost::dynamic_pointer_cast<SilentFileSource>(source) != NULL;
	if (missing_source) {
		set_color_from_rgba (c, UIConfiguration::instance().color ("region list missing source"));
	} else {
		set_color_from_rgba (c, UIConfiguration::instance().color ("region list whole file"));
	}
	row[_columns.color_] = c;

	/* NAME */
	std::string str = region->name();
	/* if a multichannel region, show the number of channels
	 * ToDo:  make a sortable column for this?
	 */
	if ( region->n_channels() > 1 ) {
		str += string_compose("[%1]", region->n_channels());
	}
	row[_columns.name] = str;

	/* TAGS */
	row[_columns.tags] = region->tags();

	row[_columns.region] = region;
	row[_columns.take_id] = source->take_id();

	/* PATH */
	string pathstr = source->name();
	if (missing_source) {
		pathstr = _("(MISSING) ") + Gtkmm2ext::markup_escape_text (source->name());
	} else {
		/* is it a file? */
		boost::shared_ptr<FileSource> fs = boost::dynamic_pointer_cast<FileSource>(source);
		if (!fs) {
			pathstr = Gtkmm2ext::markup_escape_text (source->name()); // someday: sequence region(?)
		} else {
			/* audio file? */
			boost::shared_ptr<AudioFileSource> afs = boost::dynamic_pointer_cast<AudioFileSource>(source);
			if (afs) {
				const string audio_directory = _session->session_directory().sound_path();
				if ( !PBD::path_is_within(audio_directory, fs->path())) {
					pathstr = Gtkmm2ext::markup_escape_text (fs->path());
				}
			}
			/* midi file? */
			boost::shared_ptr<SMFSource> mfs = boost::dynamic_pointer_cast<SMFSource>(source);
			if (mfs) {
				const string midi_directory = _session->session_directory().midi_path();
				if ( !PBD::path_is_within(midi_directory, fs->path())) {
					pathstr = Gtkmm2ext::markup_escape_text (fs->path());
				}
			}
		}
	}

	row[_columns.path] = pathstr;

	/* Natural Position (samples, an invisible column for sorting) */
	row[_columns.natural_s] = source->natural_position();

	/* Natural Position (text representation) */
	if (source->have_natural_position()) {
		char buf[64];
		format_position (source->natural_position(), buf, sizeof (buf));
		row[_columns.natural_pos] = buf;
	} else {
		row[_columns.natural_pos] = X_("--");
	}
}

void
EditorSources::redisplay ()
{
	remove_region_connections.drop_connections ();
	_display.set_model (Glib::RefPtr<Gtk::TreeStore>(0));
	_model->clear ();
	_model->set_sort_column (-2, SORT_ASCENDING); // Disable sorting to gain performance

	/* Ask the region factory to fill our list of whole-file regions */
	RegionFactory::foreach_region (sigc::mem_fun (*this, &EditorSources::add_source));

	_model->set_sort_column (0, SORT_ASCENDING); // re-enable sorting
	_display.set_model (_model);
}

void
EditorSources::add_source (boost::shared_ptr<ARDOUR::Region> region)
{
	if (!region || !_session ) {
		return;
	}

	/* by definition, the Source List only shows whole-file regions
	 * this roughly equates to Source objects, but preserves the stereo-ness
	 * (or multichannel-ness) of a stereo source file.
	 */
	if ( !region->whole_file() ) {
		return;
	}

	/* we only show files-on-disk.
	 * if there's some other kind of source, we ignore it (for now)
	 */
	boost::shared_ptr<FileSource> fs = boost::dynamic_pointer_cast<FileSource> (region->source());
	if (!fs || fs->empty()) {
		return;
	}

	region->DropReferences.connect (remove_region_connections, MISSING_INVALIDATOR, boost::bind (&EditorSources::remove_weak_region, this, boost::weak_ptr<Region> (region)), gui_context());

	TreeModel::Row row = *(_model->append());
	populate_row (row, region);
}

void
EditorSources::source_changed (boost::shared_ptr<ARDOUR::Region> region)
{
	/* Currently never reached .. we have no mutable properties shown in the list*/

	TreeModel::iterator i;
	TreeModel::Children rows = _model->children();

	for (i = rows.begin(); i != rows.end(); ++i) {
		boost::shared_ptr<ARDOUR::Region> rr = (*i)[_columns.region];
		if (region == rr) {
			populate_row(*i, region);
			break;
		}
	}
}

void
EditorSources::selection_changed ()
{

	if (_display.get_selection()->count_selected_rows() > 0) {

		TreeIter iter;
		TreeView::Selection::ListHandle_Path rows = _display.get_selection()->get_selected_rows ();

		_editor->get_selection().clear_regions ();

		for (TreeView::Selection::ListHandle_Path::iterator i = rows.begin(); i != rows.end(); ++i) {

			if ((iter = _model->get_iter (*i))) {

				/* highlight any regions in the editor that use this region's source */
 				boost::shared_ptr<ARDOUR::Region> region = (*iter)[_columns.region];
 				if (!region) continue;

 				boost::shared_ptr<ARDOUR::Source> source = region->source();
				if (source) {

					set<boost::shared_ptr<Region> > regions;
					RegionFactory::get_regions_using_source ( source, regions );

					for (set<boost::shared_ptr<Region> >::iterator region = regions.begin(); region != regions.end(); region++ ) {
						_change_connection.block (true);
						_editor->set_selected_regionview_from_region_list (*region, Selection::Add);
						_change_connection.block (false);

					}
				}
			}
		}
	} else {
		_editor->get_selection().clear_regions ();
	}

}

void
EditorSources::clock_format_changed ()
{
	TreeModel::iterator i;
	TreeModel::Children rows = _model->children();
	for (i = rows.begin(); i != rows.end(); ++i) {
		boost::shared_ptr<ARDOUR::Region> rr = (*i)[_columns.region];
		populate_row(*i, rr);
	}
}

void
EditorSources::format_position (samplepos_t pos, char* buf, size_t bufsize, bool onoff)
{
	Timecode::BBT_Time bbt;
	Timecode::Time timecode;

	if (pos < 0) {
		error << string_compose (_("EditorSources::format_position: negative timecode position: %1"), pos) << endmsg;
		snprintf (buf, bufsize, "invalid");
		return;
	}

	switch (ARDOUR_UI::instance()->primary_clock->mode ()) {
	case AudioClock::BBT:
		bbt = _session->tempo_map().bbt_at_sample (pos);
		if (onoff) {
			snprintf (buf, bufsize, "%03d|%02d|%04d" , bbt.bars, bbt.beats, bbt.ticks);
		} else {
			snprintf (buf, bufsize, "(%03d|%02d|%04d)" , bbt.bars, bbt.beats, bbt.ticks);
		}
		break;

	case AudioClock::MinSec:
		samplepos_t left;
		int hrs;
		int mins;
		float secs;

		left = pos;
		hrs = (int) floor (left / (_session->sample_rate() * 60.0f * 60.0f));
		left -= (samplecnt_t) floor (hrs * _session->sample_rate() * 60.0f * 60.0f);
		mins = (int) floor (left / (_session->sample_rate() * 60.0f));
		left -= (samplecnt_t) floor (mins * _session->sample_rate() * 60.0f);
		secs = left / (float) _session->sample_rate();
		if (onoff) {
			snprintf (buf, bufsize, "%02d:%02d:%06.3f", hrs, mins, secs);
		} else {
			snprintf (buf, bufsize, "(%02d:%02d:%06.3f)", hrs, mins, secs);
		}
		break;

	case AudioClock::Seconds:
		if (onoff) {
			snprintf (buf, bufsize, "%.1f", pos / (float)_session->sample_rate());
		} else {
			snprintf (buf, bufsize, "(%.1f)", pos / (float)_session->sample_rate());
		}
		break;

	case AudioClock::Samples:
		if (onoff) {
			snprintf (buf, bufsize, "%" PRId64, pos);
		} else {
			snprintf (buf, bufsize, "(%" PRId64 ")", pos);
		}
		break;

	case AudioClock::Timecode:
	default:
		_session->timecode_time (pos, timecode);
		if (onoff) {
			snprintf (buf, bufsize, "%02d:%02d:%02d:%02d", timecode.hours, timecode.minutes, timecode.seconds, timecode.frames);
		} else {
			snprintf (buf, bufsize, "(%02d:%02d:%02d:%02d)", timecode.hours, timecode.minutes, timecode.seconds, timecode.frames);
		}
		break;
	}
}

void
EditorSources::show_context_menu (int button, int time)
{
	using namespace Gtk::Menu_Helpers;
	Gtk::Menu* menu = ARDOUR_UI_UTILS::shared_popup_menu ();
	MenuList&  items = menu->items();
#ifdef RECOVER_REGIONS_IS_WORKING
	items.push_back(MenuElem(_("Recover the selected Sources to their original Track & Position"),
							 sigc::mem_fun(*this, &EditorSources::recover_selected_sources)));
#endif
	items.push_back(MenuElem(_("Remove the selected Sources"),
							 sigc::mem_fun(*this, &EditorSources::remove_selected_sources)));
	menu->popup(1, time);
}

void
EditorSources::recover_selected_sources ()
{
	ARDOUR::RegionList to_be_recovered;

	if (_display.get_selection()->count_selected_rows() > 0) {

		TreeIter iter;
		TreeView::Selection::ListHandle_Path rows = _display.get_selection()->get_selected_rows ();
		for (TreeView::Selection::ListHandle_Path::iterator i = rows.begin(); i != rows.end(); ++i) {
			if ((iter = _model->get_iter (*i))) {
				boost::shared_ptr<ARDOUR::Region> region = (*iter)[_columns.region];
				if (region) {
					to_be_recovered.push_back(region);
				}
			}
		}
	}

	/* ToDo */
	_editor->recover_regions(to_be_recovered); // this operation should be undo-able
}

void
EditorSources::remove_selected_sources ()
{
	vector<string> choices;
	string prompt;

	prompt  = _("Do you want to remove the selected Sources?"
				"\nThis operation cannot be undone."
				"\nThe source files will not actually be deleted until you execute Session->Cleanup.");

	choices.push_back (_("No, do nothing."));
	choices.push_back (_("Only remove the Regions that use these Sources."));
	choices.push_back (_("Yes, remove the Regions and Sources (cannot be undone!)"));

	Choice prompter (_("Remove selected Sources"), prompt, choices);

	int opt = prompter.run ();

	if ( opt >= 1) {

		std::list<boost::weak_ptr<ARDOUR::Source> > to_be_removed;

		if (_display.get_selection()->count_selected_rows() > 0) {

			TreeIter iter;
			TreeView::Selection::ListHandle_Path rows = _display.get_selection()->get_selected_rows ();

			_editor->get_selection().clear_regions ();

			for (TreeView::Selection::ListHandle_Path::iterator i = rows.begin(); i != rows.end(); ++i) {

				if ((iter = _model->get_iter (*i))) {

					boost::shared_ptr<ARDOUR::Region> region = (*iter)[_columns.region];

	 				if (!region) continue;

 					boost::shared_ptr<ARDOUR::Source> source = region->source();
					if (source) {
						set<boost::shared_ptr<Region> > regions;
						RegionFactory::get_regions_using_source ( source, regions );

						for (set<boost::shared_ptr<Region> >::iterator region = regions.begin(); region != regions.end(); region++ ) {
							_change_connection.block (true);
							_editor->set_selected_regionview_from_region_list (*region, Selection::Add);
							_change_connection.block (false);
						}

						to_be_removed.push_back(source);
					}
				}

			}

			_editor->remove_selected_regions(); // this operation is undo-able

			if (opt==2) {
				for (std::list<boost::weak_ptr<ARDOUR::Source> >::iterator i = to_be_removed.begin(); i != to_be_removed.end(); ++i) {
						_session->remove_source(*i); // this operation is (currently) not undo-able
				}
			}
		}
	}

}

bool
EditorSources::key_press (GdkEventKey* ev)
{
	TreeViewColumn *col;

	switch (ev->keyval) {
	case GDK_Tab:
	case GDK_ISO_Left_Tab:

		if (tags_editable) {
			tags_editable->editing_done ();
			tags_editable = 0;
		}

		col = _display.get_column (1); // select&focus on tags column

		if (Keyboard::modifier_state_equals (ev->state, Keyboard::TertiaryModifier)) {
			treeview_select_previous (_display, _model, col);
		} else {
			treeview_select_next (_display, _model, col);
		}

		return true;
		break;

	case GDK_BackSpace:
		remove_selected_sources();
		return true;

	default:
		break;
	}

	return false;
}

bool
EditorSources::button_press (GdkEventButton *ev)
{
	if (Keyboard::is_context_menu_event (ev)) {
		show_context_menu (ev->button, ev->time);
		return true;
	}
	return false;
}

void
EditorSources::tag_editing_started (CellEditable* ce, const Glib::ustring& path)
{
	tags_editable = ce;

	/* give it a special name */

	Gtk::Entry *e = dynamic_cast<Gtk::Entry*> (ce);

	if (e) {
		e->set_name (X_("SourceTagEditorEntry"));

		TreeIter iter;
		if ((iter = _model->get_iter (path))) {
			boost::shared_ptr<Region> region = (*iter)[_columns.region];

			if(region) {
				e->set_text(region->tags());
			}
		}
	}
}

void
EditorSources::tag_edit (const std::string& path, const std::string& new_text)
{
	tags_editable = 0;

	boost::shared_ptr<Region> region;
	TreeIter row_iter;

	if ((row_iter = _model->get_iter (path))) {
		region = (*row_iter)[_columns.region];
		(*row_iter)[_columns.tags] = new_text;
	}

	if (region) {
		region->set_tags (new_text);

		_session->set_dirty(); // whole-file regions aren't in a playlist to catch property changes, so we need to explicitly set the session dirty

		populate_row ((*row_iter), region);
	}
}

void
EditorSources::drag_data_received (const RefPtr<Gdk::DragContext>& context,
                                   int x, int y,
                                   const SelectionData& data,
                                   guint info, guint time)
{
	/* ToDo: allow dropping files/loops into the source list?  */
}

/** @return Region that has been dragged out of the list, or 0 */
boost::shared_ptr<ARDOUR::Region>
EditorSources::get_dragged_region ()
{
	list<boost::shared_ptr<ARDOUR::Region> > regions;
	TreeView* region;
	_display.get_object_drag_data (regions, &region);

	if (regions.empty()) {
		return boost::shared_ptr<ARDOUR::Region> ();
	}

	assert (regions.size() == 1);
	return regions.front ();
}

void
EditorSources::clear ()
{
	remove_region_connections.drop_connections ();
	_display.set_model (Glib::RefPtr<Gtk::TreeStore> (0));
	_model->clear ();
	_display.set_model (_model);
}

boost::shared_ptr<ARDOUR::Region>
EditorSources::get_single_selection ()
{
	Glib::RefPtr<TreeSelection> selected = _display.get_selection();

	if (selected->count_selected_rows() != 1) {
		return boost::shared_ptr<ARDOUR::Region> ();
	}

	TreeView::Selection::ListHandle_Path rows = selected->get_selected_rows ();

	/* only one row selected, so rows.begin() is it */

	TreeIter iter = _model->get_iter (*rows.begin());

	if (!iter) {
		return boost::shared_ptr<ARDOUR::Region> ();
	}

	return (*iter)[_columns.region];
}

void
EditorSources::freeze_tree_model ()
{
	_display.set_model (Glib::RefPtr<Gtk::TreeStore>(0));
	_model->set_sort_column (-2, SORT_ASCENDING); // Disable sorting to gain performance
}

void
EditorSources::thaw_tree_model (){

	_model->set_sort_column (0, SORT_ASCENDING); // renabale sorting
	_display.set_model (_model);
}

XMLNode &
EditorSources::get_state () const
{
	XMLNode* node = new XMLNode (X_("SourcesList"));

	//TODO: save sort state?

	return *node;
}

void
EditorSources::set_state (const XMLNode & node)
{
}