/*
    Copyright (C) 2000-2007 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 "ardour/parameter_descriptor.h"

#include "evoral/Note.hpp"
#include "canvas/container.h"
#include "canvas/polygon.h"
#include "canvas/rectangle.h"
#include "canvas/wave_view.h"
#include "canvas/debug.h"

#include "automation_time_axis.h"
#include "ghostregion.h"
#include "midi_streamview.h"
#include "midi_time_axis.h"
#include "region_view.h"
#include "rgb_macros.h"
#include "note.h"
#include "hit.h"
#include "ui_config.h"

using namespace std;
using namespace Editing;
using namespace ArdourCanvas;
using namespace ARDOUR;

GhostRegion::GhostRegion(RegionView& rv,
                         ArdourCanvas::Container* parent,
                         TimeAxisView& tv,
                         TimeAxisView& source_tv,
                         double initial_pos)
    : parent_rv(rv)
    , trackview(tv)
    , source_trackview(source_tv)
{
	group = new ArdourCanvas::Container (parent);
	CANVAS_DEBUG_NAME (group, "ghost region");
	group->set_position (ArdourCanvas::Duple (initial_pos, 0));

	base_rect = new ArdourCanvas::Rectangle (group);
	CANVAS_DEBUG_NAME (base_rect, "ghost region rect");
	base_rect->set_x0 (0);
	base_rect->set_y0 (1.0);
	base_rect->set_y1 (trackview.current_height());
	base_rect->set_outline (false);

	if (!is_automation_ghost()) {
		base_rect->hide();
	}

	GhostRegion::set_colors();

	/* the parent group of a ghostregion is a dedicated group for ghosts,
	   so the new ghost would want to get to the top of that group*/
	group->raise_to_top ();
}

GhostRegion::~GhostRegion ()
{
	parent_rv.remove_ghost(this);
	trackview.erase_ghost(this);
	delete base_rect;
	delete group;
}

void
GhostRegion::set_duration (double units)
{
	base_rect->set_x1 (units);
}

void
GhostRegion::set_height ()
{
	base_rect->set_y1 (trackview.current_height());
}

void
GhostRegion::set_colors ()
{
	if (is_automation_ghost()) {
		base_rect->set_fill_color (UIConfiguration::instance().color_mod ("ghost track base", "ghost track base"));
	}
}

guint
GhostRegion::source_track_color(unsigned char alpha)
{
	Gdk::Color color = source_trackview.color();
	return RGBA_TO_UINT (color.get_red() / 256, color.get_green() / 256, color.get_blue() / 256, alpha);
}

bool
GhostRegion::is_automation_ghost()
{
	return (dynamic_cast<AutomationTimeAxisView*>(&trackview)) != 0;
}

AudioGhostRegion::AudioGhostRegion(RegionView& rv,
                                   TimeAxisView& tv,
                                   TimeAxisView& source_tv,
                                   double initial_unit_pos)
    : GhostRegion(rv, tv.ghost_group(), tv, source_tv, initial_unit_pos)
{

}

void
AudioGhostRegion::set_samples_per_pixel (double fpp)
{
	for (vector<WaveView*>::iterator i = waves.begin(); i != waves.end(); ++i) {
		(*i)->set_samples_per_pixel (fpp);
	}
}

void
AudioGhostRegion::set_height ()
{
	vector<WaveView*>::iterator i;
	uint32_t n;

	GhostRegion::set_height();

	double const ht = ((trackview.current_height()) / (double) waves.size());

	for (n = 0, i = waves.begin(); i != waves.end(); ++i, ++n) {
		(*i)->set_height (ht);
		(*i)->set_y_position (n * ht);
	}
}

void
AudioGhostRegion::set_colors ()
{
	GhostRegion::set_colors();
	guint fill_color;

	if (is_automation_ghost()) {
		fill_color = UIConfiguration::instance().color ("ghost track wave fill");
	}
	else {
		fill_color = source_track_color(200);
	}

	for (uint32_t n=0; n < waves.size(); ++n) {
		waves[n]->set_outline_color (UIConfiguration::instance().color ("ghost track wave"));
		waves[n]->set_fill_color (fill_color);
		waves[n]->set_clip_color (UIConfiguration::instance().color ("ghost track wave clip"));
		waves[n]->set_zero_color (UIConfiguration::instance().color ("ghost track zero line"));
	}
}

/** The general constructor; called when the destination timeaxisview doesn't have
 *  a midistreamview.
 *
 *  @param rv The parent RegionView that is being ghosted.
 *  @param tv TimeAxisView that this ghost region is on.
 *  @param source_tv TimeAxisView that we are the ghost for.
 */
MidiGhostRegion::MidiGhostRegion(RegionView& rv,
                                 TimeAxisView& tv,
                                 TimeAxisView& source_tv,
                                 double initial_unit_pos)
    : GhostRegion(rv, tv.ghost_group(), tv, source_tv, initial_unit_pos)
    , _optimization_iterator(events.end())
{
	set_colors();

	base_rect->lower_to_bottom();
	update_range ();

	midi_view()->NoteRangeChanged.connect (sigc::mem_fun (*this, &MidiGhostRegion::update_range));
}

/**
 *  @param rv The parent RegionView being ghosted.
 *  @param msv MidiStreamView that this ghost region is on.
 *  @param source_tv TimeAxisView that we are the ghost for.
 */
MidiGhostRegion::MidiGhostRegion(RegionView& rv,
                                 MidiStreamView& msv,
                                 TimeAxisView& source_tv,
                                 double initial_unit_pos)
    : GhostRegion(rv,
                  msv.midi_underlay_group,
                  msv.trackview(),
                  source_tv,
                  initial_unit_pos)
    , _optimization_iterator(events.end())
{
	set_colors();

	base_rect->lower_to_bottom();
	update_range ();

	midi_view()->NoteRangeChanged.connect (sigc::mem_fun (*this, &MidiGhostRegion::update_range));
}

MidiGhostRegion::~MidiGhostRegion()
{
	clear_events ();
}

MidiGhostRegion::GhostEvent::GhostEvent (NoteBase* e, ArdourCanvas::Container* g)
	: event (e)
{
	Hit* hit = NULL;
	if (dynamic_cast<Note*>(e)) {
		item = new ArdourCanvas::Rectangle(
			g, ArdourCanvas::Rect(e->x0(), e->y0(), e->x1(), e->y1()));
	} else if ((hit = dynamic_cast<Hit*>(e))) {
		ArdourCanvas::Polygon* poly = new ArdourCanvas::Polygon(g);
		poly->set(Hit::points(e->y1() - e->y0()));
		poly->set_position(hit->position());
		item = poly;
	}

	CANVAS_DEBUG_NAME (item, "ghost note item");
}

MidiGhostRegion::GhostEvent::~GhostEvent ()
{
	/* event is not ours to delete */
	delete item;
}

void
MidiGhostRegion::set_samples_per_pixel (double /*spu*/)
{
}

/** @return MidiStreamView that we are providing a ghost for */
MidiStreamView*
MidiGhostRegion::midi_view ()
{
	StreamView* sv = source_trackview.view ();
	assert (sv);
	MidiStreamView* msv = dynamic_cast<MidiStreamView*> (sv);
	assert (msv);

	return msv;
}

void
MidiGhostRegion::set_height ()
{
	GhostRegion::set_height();
	update_range();
}

void
MidiGhostRegion::set_colors()
{
	GhostRegion::set_colors();
	_outline = UIConfiguration::instance().color ("ghost track midi outline");

	for (EventList::iterator it = events.begin(); it != events.end(); ++it) {
		(*it)->item->set_fill_color (UIConfiguration::instance().color_mod((*it)->event->base_color(), "ghost track midi fill"));
		(*it)->item->set_outline_color (_outline);
	}
}

static double
note_height(TimeAxisView& trackview, MidiStreamView* mv)
{
	const double tv_height  = trackview.current_height();
	const double note_range = mv->contents_note_range();

	return std::max(1.0, floor(tv_height / note_range - 1.0));
}

static double
note_y(TimeAxisView& trackview, MidiStreamView* mv, uint8_t note_num)
{
	const double tv_height  = trackview.current_height();
	const double note_range = mv->contents_note_range();
	const double s          = tv_height / note_range;

	return tv_height - (note_num + 1 - mv->lowest_note()) * s;
}

void
MidiGhostRegion::update_range ()
{
	MidiStreamView* mv = midi_view();

	if (!mv) {
		return;
	}

	double const h = note_height(trackview, mv);

	for (EventList::iterator it = events.begin(); it != events.end(); ++it) {
		uint8_t const note_num = (*it)->event->note()->note();

		if (note_num < mv->lowest_note() || note_num > mv->highest_note()) {
			(*it)->item->hide();
		} else {
			(*it)->item->show();
			double const y = note_y(trackview, mv, note_num);
			ArdourCanvas::Rectangle* rect = NULL;
			ArdourCanvas::Polygon*   poly = NULL;
			if ((rect = dynamic_cast<ArdourCanvas::Rectangle*>((*it)->item))) {
				rect->set_y0 (y);
				rect->set_y1 (y + h);
			} else if ((poly = dynamic_cast<ArdourCanvas::Polygon*>((*it)->item))) {
				Duple position = poly->position();
				position.y = y;
				poly->set_position(position);
				poly->set(Hit::points(h));
			}
		}
	}
}

void
MidiGhostRegion::add_note (NoteBase* n)
{
	GhostEvent* event = new GhostEvent (n, group);
	events.push_back (event);

	event->item->set_fill_color (UIConfiguration::instance().color_mod(n->base_color(), "ghost track midi fill"));
	event->item->set_outline_color (_outline);

	MidiStreamView* mv = midi_view();

	if (mv) {
		uint8_t const note_num = n->note()->note();
		double const  h        = note_height(trackview, mv);
		double const  y        = note_y(trackview, mv, note_num);

		if (note_num < mv->lowest_note() || note_num > mv->highest_note()) {
			event->item->hide();
		} else {
			ArdourCanvas::Rectangle* rect = NULL;
			ArdourCanvas::Polygon*   poly = NULL;
			if ((rect = dynamic_cast<ArdourCanvas::Rectangle*>(event->item))) {
				rect->set (ArdourCanvas::Rect (rect->x0(), y, rect->x1(), y + h));
			} else if ((poly = dynamic_cast<ArdourCanvas::Polygon*>(event->item))) {
				Duple position = poly->position();
				position.y = y;
				poly->set_position(position);
				poly->set(Hit::points(h));
			}
		}
	}
}

void
MidiGhostRegion::clear_events()
{
	for (EventList::iterator it = events.begin(); it != events.end(); ++it) {
		delete *it;
	}

	events.clear();
	_optimization_iterator = events.end ();
}

/** Update the x positions of our representation of a parent's note.
 *  @param parent The CanvasNote from the parent MidiRegionView.
 */
void
MidiGhostRegion::update_note (Note* note)
{
	GhostEvent* ev = find_event (note);
	if (!ev) {
		return;
	}

	ArdourCanvas::Rectangle* rect = NULL;
	if ((rect = dynamic_cast<ArdourCanvas::Rectangle*>(ev->item))) {
		rect->set (ArdourCanvas::Rect (note->x0(), rect->y0(), note->x1(), rect->y1()));
	}
}
/** Update the x positions of our representation of a parent's hit.
 *  @param hit The CanvasHit from the parent MidiRegionView.
 */
void
MidiGhostRegion::update_hit (Hit* hit)
{
	GhostEvent* ev = find_event (hit);
	if (!ev) {
		return;
	}

	ArdourCanvas::Polygon*   poly = NULL;
	if ((poly = dynamic_cast<ArdourCanvas::Polygon*>(ev->item))) {
		ArdourCanvas::Duple ppos = hit->position();
		ArdourCanvas::Duple gpos = poly->position();
		gpos.x = ppos.x;
		poly->set_position(gpos);
	}
}

void
MidiGhostRegion::remove_note (NoteBase* note)
{
	GhostEvent* ev = find_event (note);
	if (!ev) {
		return;
	}

	events.remove (ev);
	delete ev;
	_optimization_iterator = events.end ();
}

/** Given a note in our parent region (ie the actual MidiRegionView), find our
 *  representation of it.
 *  @return Our Event, or 0 if not found.
 */

MidiGhostRegion::GhostEvent *
MidiGhostRegion::find_event (NoteBase* parent)
{
	/* we are using _optimization_iterator to speed up the common case where a caller
	   is going through our notes in order.
	*/

	if (_optimization_iterator != events.end()) {
		++_optimization_iterator;
	}

	if (_optimization_iterator != events.end() && (*_optimization_iterator)->event == parent) {
		return *_optimization_iterator;
	}

	for (_optimization_iterator = events.begin(); _optimization_iterator != events.end(); ++_optimization_iterator) {
		if ((*_optimization_iterator)->event == parent) {
			return *_optimization_iterator;
		}
	}

	return 0;
}