/*
    Copyright (C) 2000-2005 Paul Davis 

    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., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

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

#include <pbd/basename.h>

#include <ardour/audioregion.h>
#include <ardour/audiofilesource.h>
#include <ardour/silentfilesource.h>
#include <ardour/session_region.h>

#include <gtkmm2ext/stop_signal.h>

#include "editor.h"
#include "editing.h"
#include "keyboard.h"
#include "ardour_ui.h"
#include "gui_thread.h"
#include "actions.h"
#include "utils.h"

#include "i18n.h"

using namespace sigc;
using namespace ARDOUR;
using namespace PBD;
using namespace Gtk;
using namespace Glib;
using namespace Editing;

void
Editor::handle_audio_region_removed (boost::weak_ptr<AudioRegion> wregion)
{
	ENSURE_GUI_THREAD (mem_fun (*this, &Editor::redisplay_regions));
	redisplay_regions ();
}

void
Editor::handle_new_audio_region (boost::weak_ptr<AudioRegion> wregion)
{
	ENSURE_GUI_THREAD (bind (mem_fun (*this, &Editor::handle_new_audio_region), wregion));

	/* don't copy region - the one we are being notified
	   about belongs to the session, and so it will
	   never be edited.
	*/

	boost::shared_ptr<AudioRegion> region (wregion.lock());
	
	if (region) {
		add_audio_region_to_region_display (region);
	}
}

void
Editor::region_hidden (boost::shared_ptr<Region> r)
{
	ENSURE_GUI_THREAD(bind (mem_fun(*this, &Editor::region_hidden), r));	

	redisplay_regions ();
}

void
Editor::add_audio_region_to_region_display (boost::shared_ptr<AudioRegion> region)
{
	string str;
	TreeModel::Row row;
	Gdk::Color c;
	bool missing_source;

	missing_source = boost::dynamic_pointer_cast<SilentFileSource>(region->source());

	if (!show_automatic_regions_in_region_list && region->automatic()) {
		return;
	}

	if (region->hidden()) {

		TreeModel::iterator iter = region_list_model->get_iter ("0");
		TreeModel::Row parent;
		TreeModel::Row child;

		if (iter == region_list_model->children().end()) {
			
			parent = *(region_list_model->append());
			
			parent[region_list_columns.name] = _("Hidden");
			boost::shared_ptr<Region> proxy = parent[region_list_columns.region];
			proxy.reset ();

		} else {

			if ((*iter)[region_list_columns.name] != _("Hidden")) {

				parent = *(region_list_model->insert(iter));
				parent[region_list_columns.name] = _("Hidden");
				boost::shared_ptr<Region> proxy = parent[region_list_columns.region];
				proxy.reset ();

			} else {
				parent = *iter;
			}

		}

		row = *(region_list_model->append (parent.children()));

	} else if (region->whole_file()) {

		row = *(region_list_model->append());
		if (missing_source) {
			c.set_rgb(65535,0,0);     // FIXME: error color from style
		} else {
			set_color(c, rgba_from_style ("RegionListWholeFile", 0xff, 0, 0, 0, "fg", Gtk::STATE_NORMAL, false ));
		}
		row[region_list_columns.color_] = c;

		if (region->source()->name()[0] == '/') { // external file

			if (region->whole_file()) {

				boost::shared_ptr<AudioFileSource> afs = boost::dynamic_pointer_cast<AudioFileSource>(region->source());

				str = ".../";

				if (afs) {
					str = region_name_from_path (afs->path(), region->n_channels() > 1);
				} else {
					str += region->source()->name();
				}

			} else {
				str = region->name();
			}

		} else {

			str = region->name();

		}

		if (region->n_channels() > 1) {
			std::stringstream foo;
			foo << region->n_channels ();
			str += " [";
			str += foo.str();
			str += ']';
		}

		if (missing_source) {
			str += _(" (MISSING)");
		}

		row[region_list_columns.name] = str;
		row[region_list_columns.region] = region;

		return;
		
	} else {

		/* find parent node, add as new child */
		
		TreeModel::iterator i;
		TreeModel::Children rows = region_list_model->children();
		bool found_parent = false;

		for (i = rows.begin(); i != rows.end(); ++i) {

			boost::shared_ptr<Region> rr = (*i)[region_list_columns.region];
			boost::shared_ptr<AudioRegion> r = boost::dynamic_pointer_cast<AudioRegion>(rr);

			if (r && r->whole_file()) {
				if (region->source_equivalent (r)) {
					row = *(region_list_model->append ((*i).children()));
					found_parent = true;
					break;
				}
			}
		}

		if (!found_parent) {
			row = *(region_list_model->append());
		}

		
	}
	
	row[region_list_columns.region] = region;
	
	if (region->n_channels() > 1) {
		row[region_list_columns.name] = string_compose("%1  [%2]", region->name(), region->n_channels());
	} else {
		row[region_list_columns.name] = region->name();
	}
}

void
Editor::region_list_selection_changed() 
{
	bool selected;

	if (region_list_display.get_selection()->count_selected_rows() > 0) {
		selected = true;
	} else {
		selected = false;
	}
	
	if (selected) {
		TreeView::Selection::ListHandle_Path rows = region_list_display.get_selection()->get_selected_rows ();
		TreeView::Selection::ListHandle_Path::iterator i = rows.begin();
		TreeIter iter;

		/* just set the first selected region (in fact, the selection model might be SINGLE, which
		   means there can only be one.
		*/
		
		if ((iter = region_list_model->get_iter (*i))) {
			set_selected_regionview_from_region_list (((*iter)[region_list_columns.region]), Selection::Set);
		}
	}
}

void
Editor::insert_into_tmp_audio_regionlist(boost::shared_ptr<AudioRegion> region)
{
	/* keep all whole files at the beginning */
	
	if (region->whole_file()) {
		tmp_audio_region_list.push_front (region);
	} else {
		tmp_audio_region_list.push_back (region);
	}
}

void
Editor::redisplay_regions ()
{
	if (session) {

		region_list_display.set_model (Glib::RefPtr<Gtk::TreeStore>(0));
		region_list_model->clear ();

		/* now add everything we have, via a temporary list used to help with
		   sorting.
		*/
		
		tmp_audio_region_list.clear();
		session->foreach_audio_region (this, &Editor::insert_into_tmp_audio_regionlist);

		for (list<boost::shared_ptr<AudioRegion> >::iterator r = tmp_audio_region_list.begin(); r != tmp_audio_region_list.end(); ++r) {
			add_audio_region_to_region_display (*r);
		}
		tmp_audio_region_list.clear();
		
		region_list_display.set_model (region_list_model);
	}
}

void
Editor::build_region_list_menu ()
{
	region_list_menu = dynamic_cast<Menu*>(ActionManager::get_widget ("/RegionListMenu"));
					       
	/* now grab specific menu items that we need */

	Glib::RefPtr<Action> act;

	act = ActionManager::get_action (X_("RegionList"), X_("rlShowAll"));
	if (act) {
		toggle_full_region_list_action = Glib::RefPtr<ToggleAction>::cast_dynamic (act);
	}

	act = ActionManager::get_action (X_("RegionList"), X_("rlShowAuto"));
	if (act) {
		toggle_show_auto_regions_action = Glib::RefPtr<ToggleAction>::cast_dynamic (act);
	}
}

void
Editor::toggle_show_auto_regions ()
{
	show_automatic_regions_in_region_list = toggle_show_auto_regions_action->get_active();
	redisplay_regions ();
}

void
Editor::toggle_full_region_list ()
{
	if (toggle_full_region_list_action->get_active()) {
		region_list_display.expand_all ();
	} else {
		region_list_display.collapse_all ();
	}
}

void
Editor::show_region_list_display_context_menu (int button, int time)
{
	if (region_list_menu == 0) {
		build_region_list_menu ();
	}

	if (region_list_display.get_selection()->count_selected_rows() > 0) {
		ActionManager::set_sensitive (ActionManager::region_list_selection_sensitive_actions, true);
	} else {
		ActionManager::set_sensitive (ActionManager::region_list_selection_sensitive_actions, false);
	}

	region_list_menu->popup (button, time);
}

bool
Editor::region_list_display_key_press (GdkEventKey* ev)
{
	return false;
}

bool
Editor::region_list_display_key_release (GdkEventKey* ev)
{
	switch (ev->keyval) {
	case GDK_Delete:
		remove_region_from_region_list ();
		return true;
		break;
	default:
		break;
	}

	return false;
}

bool
Editor::region_list_display_button_press (GdkEventButton *ev)
{
	boost::shared_ptr<Region> region;
	TreeIter iter;
	TreeModel::Path path;
	TreeViewColumn* column;
	int cellx;
	int celly;

	if (region_list_display.get_path_at_pos ((int)ev->x, (int)ev->y, path, column, cellx, celly)) {
		if ((iter = region_list_model->get_iter (path))) {
			region = (*iter)[region_list_columns.region];
		}
	}

	if (Keyboard::is_context_menu_event (ev)) {
		show_region_list_display_context_menu (ev->button, ev->time);
		return true;
	}

	if (region == 0) {
		return false;
	}

	switch (ev->button) {
	case 1:
		/* audition on double click */
		if (ev->type == GDK_2BUTTON_PRESS) {
			consider_auditioning (region);
			return true;
		}
		return false;
		break;

	case 2:
		if (!Keyboard::modifier_state_equals (ev->state, Keyboard::Control)) {
			consider_auditioning (region);
		}
		return true;
		break;

	default:
		break; 
	}

	return false;
}	

bool
Editor::region_list_display_button_release (GdkEventButton *ev)
{
	TreeIter iter;
	TreeModel::Path path;
	TreeViewColumn* column;
	int cellx;
	int celly;
	boost::shared_ptr<Region> region;

	if (region_list_display.get_path_at_pos ((int)ev->x, (int)ev->y, path, column, cellx, celly)) {
		if ((iter = region_list_model->get_iter (path))) {
			region = (*iter)[region_list_columns.region];
		}
	}

	if (region && Keyboard::is_delete_event (ev)) {
		session->remove_region_from_region_list (region);
		return true;
	}

	return false;
}

void
Editor::consider_auditioning (boost::shared_ptr<Region> region)
{
	boost::shared_ptr<AudioRegion> r = boost::dynamic_pointer_cast<AudioRegion> (region);

	if (r == 0) {
		session->cancel_audition ();
		return;
	}

	if (session->is_auditioning()) {
		session->cancel_audition ();
		if (r == last_audition_region) {
			return;
		}
	}

	session->audition_region (r);
	last_audition_region = r;
}

int
Editor::region_list_sorter (TreeModel::iterator a, TreeModel::iterator b)
{
	int cmp = 0;

	boost::shared_ptr<Region> r1 = (*a)[region_list_columns.region];
	boost::shared_ptr<Region> r2 = (*b)[region_list_columns.region];

	/* handle rows without regions, like "Hidden" */

	if (r1 == 0) {
		return -1;
	}

	if (r2 == 0) {
		return 1;
	}

	boost::shared_ptr<AudioRegion> region1 = boost::dynamic_pointer_cast<AudioRegion> (r1);
	boost::shared_ptr<AudioRegion> region2 = boost::dynamic_pointer_cast<AudioRegion> (r2);

	if (region1 == 0 || region2 == 0) {
		Glib::ustring s1;
		Glib::ustring s2;
		switch (region_list_sort_type) {
		case ByName:
			s1 = (*a)[region_list_columns.name];
			s2 = (*b)[region_list_columns.name];
			return (s1.compare (s2));
		default:
			return 0;
		}
	}

	switch (region_list_sort_type) {
	case ByName:
		cmp = strcasecmp (region1->name().c_str(), region2->name().c_str());
		break;

	case ByLength:
		cmp = region1->length() - region2->length();
		break;
		
	case ByPosition:
		cmp = region1->position() - region2->position();
		break;
		
	case ByTimestamp:
		cmp = region1->source()->timestamp() - region2->source()->timestamp();
		break;
	
	case ByStartInFile:
		cmp = region1->start() - region2->start();
		break;
		
	case ByEndInFile:
		cmp = (region1->start() + region1->length()) - (region2->start() + region2->length());
		break;
		
	case BySourceFileName:
		cmp = strcasecmp (region1->source()->name().c_str(), region2->source()->name().c_str());
		break;

	case BySourceFileLength:
		cmp = region1->source()->length() - region2->source()->length();
		break;
		
	case BySourceFileCreationDate:
		cmp = region1->source()->timestamp() - region2->source()->timestamp();
		break;

	case BySourceFileFS:
		if (region1->source()->name() == region2->source()->name()) {
			cmp = strcasecmp (region1->name().c_str(),  region2->name().c_str());
		} else {
			cmp = strcasecmp (region1->source()->name().c_str(),  region2->source()->name().c_str());
		}
		break;
	}

	if (cmp < 0) {
		return -1;
	} else if (cmp > 0) {
		return 1;
	} else {
		return 0;
	}
}

void
Editor::reset_region_list_sort_type (RegionListSortType type)
{
	if (type != region_list_sort_type) {
		region_list_sort_type = type;
		region_list_model->set_sort_func (0, (mem_fun (*this, &Editor::region_list_sorter)));
	}
}

void
Editor::reset_region_list_sort_direction (bool up)
{
	region_list_model->set_sort_column (0, up ? SORT_ASCENDING : SORT_DESCENDING);
}

void
Editor::region_list_selection_mapover (slot<void,boost::shared_ptr<Region> > sl)
{
	Glib::RefPtr<TreeSelection> selection = region_list_display.get_selection();
	TreeView::Selection::ListHandle_Path rows = selection->get_selected_rows ();
	TreeView::Selection::ListHandle_Path::iterator i = rows.begin();

	if (selection->count_selected_rows() == 0 || session == 0) {
		return;
	}

	for (; i != rows.end(); ++i) {
		TreeIter iter;

		if ((iter = region_list_model->get_iter (*i))) {
			sl (((*iter)[region_list_columns.region]));
		}
	}
}

void
Editor::hide_a_region (boost::shared_ptr<Region> r)
{
	r->set_hidden (true);
}

void
Editor::remove_a_region (boost::shared_ptr<Region> r)
{
	cerr << "remove " << r->name();
	session->remove_region_from_region_list (r);
}

void
Editor::audition_region_from_region_list ()
{
	region_list_selection_mapover (mem_fun (*this, &Editor::consider_auditioning));
}

void
Editor::hide_region_from_region_list ()
{
	region_list_selection_mapover (mem_fun (*this, &Editor::hide_a_region));
}

void
Editor::remove_region_from_region_list ()
{
	cerr << "Mapping remove over region selection\n";
	region_list_selection_mapover (mem_fun (*this, &Editor::remove_a_region));
}

void  
Editor::region_list_display_drag_data_received (const RefPtr<Gdk::DragContext>& context,
						int x, int y, 
						const SelectionData& data,
						guint info, guint time)
{
	vector<ustring> paths;

	if (convert_drop_to_paths (paths, context, x, y, data, info, time) == 0) {
		nframes_t pos = 0;
		do_embed (paths, false, ImportAsRegion, 0, pos, true);
		context->drag_finish (true, false, time);
	}
}

bool
Editor::region_list_selection_filter (const RefPtr<TreeModel>& model, const TreeModel::Path& path, bool yn)
{
	/* not possible to select rows that do not represent regions, like "Hidden" */

	/// XXXX FIXME boost::shared_ptr<Region> r = ((model->get_iter (path)))[region_list_columns.region];
	/// return r != 0;
	return true;
}