/*
    Copyright (C) 2001-2007 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 <cmath>
#include <cassert>
#include <utility>

#include <gtkmm.h>

#include <gtkmm2ext/gtk_ui.h>

#include "ardour/midi_diskstream.h"
#include "ardour/midi_playlist.h"
#include "ardour/midi_region.h"
#include "ardour/midi_source.h"
#include "ardour/midi_track.h"
#include "ardour/region_factory.h"
#include "ardour/smf_source.h"
#include "ardour/session.h"

#include "ardour_ui.h"
#include "canvas-simplerect.h"
#include "gui_thread.h"
#include "lineset.h"
#include "midi_region_view.h"
#include "midi_streamview.h"
#include "midi_time_axis.h"
#include "midi_util.h"
#include "public_editor.h"
#include "region_selection.h"
#include "region_view.h"
#include "rgb_macros.h"
#include "selection.h"
#include "simplerect.h"
#include "utils.h"

using namespace std;
using namespace ARDOUR;
using namespace PBD;
using namespace Editing;

MidiStreamView::MidiStreamView (MidiTimeAxisView& tv)
	: StreamView (tv)
	, note_range_adjustment(0.0f, 0.0f, 0.0f)
	, _range_dirty(false)
	, _range_sum_cache(-1.0)
	, _lowest_note(60)
	, _highest_note(71)
	, _data_note_min(60)
	, _data_note_max(71)
{
	if (tv.is_track()) {
		stream_base_color = ARDOUR_UI::config()->canvasvar_MidiTrackBase.get();
	} else {
		stream_base_color = ARDOUR_UI::config()->canvasvar_MidiBusBase.get();
	}

	use_rec_regions = tv.editor().show_waveforms_recording ();

	/* use a group dedicated to MIDI underlays. Audio underlays are not in this group. */
	midi_underlay_group = new ArdourCanvas::Group (*canvas_group);
	midi_underlay_group->lower_to_bottom();

	/* put the note lines in the timeaxisview's group, so it
	   can be put below ghost regions from MIDI underlays*/
	_note_lines = new ArdourCanvas::LineSet(*canvas_group, ArdourCanvas::LineSet::Horizontal);

	_note_lines->property_x1() = 0;
	_note_lines->property_y1() = 0;
	_note_lines->property_x2() = trackview().editor().frame_to_pixel (max_frames);
	_note_lines->property_y2() = 0;

	_note_lines->signal_event().connect(sigc::bind(
			sigc::mem_fun(_trackview.editor(), &PublicEditor::canvas_stream_view_event),
			_note_lines, &_trackview));

	_note_lines->lower_to_bottom();

	ColorsChanged.connect(sigc::mem_fun(*this, &MidiStreamView::draw_note_lines));

	note_range_adjustment.set_page_size(_highest_note - _lowest_note);
	note_range_adjustment.set_value(_lowest_note);

	note_range_adjustment.signal_value_changed().connect(
			sigc::mem_fun(*this, &MidiStreamView::note_range_adjustment_changed));
}

MidiStreamView::~MidiStreamView ()
{
}

static void
veto_note_range(uint8_t& min, uint8_t& max)
{
	/* Legal notes, thanks */
	clamp_to_0_127(min);
	clamp_to_0_127(max);

	/* Always display at least one octave in [0, 127] */
	if (max == 127) {
		if (min > (127 - 11)) {
			min = 127 - 11;
		}
	} else if (max < min + 11) {
		uint8_t d = 11 - (max - min);
		if (max + d/2 > 127) {
			min -= d;
		} else {
			min -= d / 2;
			max += d / 2;
		}
	}
	assert(max - min >= 11);
	assert(max <= 127);
	assert(min <= 127);
}

RegionView*
MidiStreamView::create_region_view (boost::shared_ptr<Region> r, bool /*wfd*/, bool)
{
	boost::shared_ptr<MidiRegion> region = boost::dynamic_pointer_cast<MidiRegion> (r);

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

	RegionView* region_view = new MidiRegionView (canvas_group, _trackview, region,
						      _samples_per_unit, region_color);

	region_view->init (region_color, false);

	return region_view;
}

RegionView*
MidiStreamView::add_region_view_internal (boost::shared_ptr<Region> r, bool wfd, bool recording)
{
	boost::shared_ptr<MidiRegion> region = boost::dynamic_pointer_cast<MidiRegion> (r);

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

	for (list<RegionView*>::iterator i = region_views.begin(); i != region_views.end(); ++i) {
		if ((*i)->region() == r) {

			/* great. we already have a MidiRegionView for this Region. use it again. */

			(*i)->set_valid (true);

			display_region(dynamic_cast<MidiRegionView*>(*i), wfd);

			return 0;
		}
	}

	MidiRegionView* region_view = dynamic_cast<MidiRegionView*> (create_region_view (r, wfd, recording));
	if (region_view == 0) {
		return 0;
	}

	region_views.push_front (region_view);

	/* display events and find note range */
	display_region (region_view, wfd);

	/* catch regionview going away */
	region->DropReferences.connect (*this, boost::bind (&MidiStreamView::remove_region_view, this, region), gui_context());

	RegionViewAdded (region_view);

	return region_view;
}

void
MidiStreamView::display_region(MidiRegionView* region_view, bool load_model)
{
	if ( ! region_view)
		return;

	region_view->enable_display(true);

	boost::shared_ptr<MidiSource> source(region_view->midi_region()->midi_source(0));

	if (load_model) {
		source->load_model();
	}

	_range_dirty = update_data_note_range(
			source->model()->lowest_note(),
			source->model()->highest_note());

	// Display region contents
	region_view->set_height(height);
	region_view->display_model(source->model());
}

void
MidiStreamView::display_diskstream (boost::shared_ptr<Diskstream> ds)
{
	StreamView::display_diskstream(ds);
	draw_note_lines();
	NoteRangeChanged();
}

void
MidiStreamView::update_contents_metrics(boost::shared_ptr<Region> r)
{
	boost::shared_ptr<MidiRegion> mr = boost::dynamic_pointer_cast<MidiRegion>(r);
	if (mr) {
		mr->midi_source(0)->load_model();
		_range_dirty = update_data_note_range(
				mr->model()->lowest_note(),
				mr->model()->highest_note());
	}
}

bool
MidiStreamView::update_data_note_range(uint8_t min, uint8_t max)
{
	bool dirty = false;
	if (min < _data_note_min) {
		_data_note_min = min;
		dirty = true;
	}
	if (max > _data_note_max) {
		_data_note_max = max;
		dirty = true;
	}
	return dirty;
}

void
MidiStreamView::redisplay_diskstream ()
{
	if (!_trackview.is_midi_track()) {
		return;
	}

	list<RegionView*>::iterator i;

	// Load models if necessary, and find note range of all our contents
	_range_dirty = false;
	_data_note_min = 127;
	_data_note_max = 0;
	_trackview.get_diskstream()->playlist()->foreach_region(
		sigc::mem_fun (*this, &StreamView::update_contents_metrics)
		);

	// No notes, use default range
	if (!_range_dirty) {
		_data_note_min = 60;
		_data_note_max = 71;
	}

	// Extend visible range to show newly recorded data, if necessary
	_lowest_note  = std::min(_lowest_note, _data_note_min);
	_highest_note = std::max(_highest_note, _data_note_max);

	veto_note_range(_lowest_note, _highest_note);

	// Flag region views as invalid and disable drawing
	for (i = region_views.begin(); i != region_views.end(); ++i) {
		(*i)->set_valid(false);
		(*i)->enable_display(false);
	}

	// Add and display region views, and flag them as valid
	_trackview.get_diskstream()->playlist()->foreach_region(
		sigc::hide_return (sigc::mem_fun (*this, &StreamView::add_region_view))
		);

	// Stack regions by layer, and remove invalid regions
	layer_regions();

	// Update note range (not regions which are correct) and draw note lines
	apply_note_range(_lowest_note, _highest_note, false);
}


void
MidiStreamView::update_contents_height ()
{
	StreamView::update_contents_height();
	_note_lines->property_y2() = height;
	draw_note_lines();
}

void
MidiStreamView::draw_note_lines()
{
	double y;
	double prev_y = contents_height();
	uint32_t color;

	_note_lines->clear();

	for (int i = lowest_note(); i <= highest_note(); ++i) {
		y = floor(note_to_y(i));

		_note_lines->add_line(prev_y, 1.0, ARDOUR_UI::config()->canvasvar_PianoRollBlackOutline.get());

		switch (i % 12) {
		case 1:
		case 3:
		case 6:
		case 8:
		case 10:
			color = ARDOUR_UI::config()->canvasvar_PianoRollBlack.get();
			break;
		default:
			color = ARDOUR_UI::config()->canvasvar_PianoRollWhite.get();
			break;
		}

		if (i == highest_note()) {
			_note_lines->add_line(y, prev_y - y, color);
		} else {
			_note_lines->add_line(y + 1.0, prev_y - y - 1.0, color);
		}

		prev_y = y;
	}
}

void
MidiStreamView::set_note_range(VisibleNoteRange r)
{
	if (r == FullRange) {
		_lowest_note = 0;
		_highest_note = 127;
	} else {
		_lowest_note = _data_note_min;
		_highest_note = _data_note_max;
	}

	apply_note_range(_lowest_note, _highest_note, true);
}

void
MidiStreamView::apply_note_range(uint8_t lowest, uint8_t highest, bool to_region_views)
{
	_highest_note = highest;
	_lowest_note = lowest;
	note_range_adjustment.set_page_size(_highest_note - _lowest_note);
	note_range_adjustment.set_value(_lowest_note);
	draw_note_lines();

	if (to_region_views) {
		for (list<RegionView*>::iterator i = region_views.begin(); i != region_views.end(); ++i) {
			((MidiRegionView*)(*i))->apply_note_range(lowest, highest);
		}
	}

	NoteRangeChanged();
}

void
MidiStreamView::update_note_range(uint8_t note_num)
{
	assert(note_num <= 127);
	_data_note_min = min(_data_note_min, note_num);
	_data_note_max = max(_data_note_max, note_num);
}

void
MidiStreamView::setup_rec_box ()
{
	// cerr << _trackview.name() << " streamview SRB\n";

	if (_trackview.session()->transport_rolling()) {

		if (!rec_active &&
		    _trackview.session()->record_status() == Session::Recording &&
		    _trackview.get_diskstream()->record_enabled()) {

			if (use_rec_regions && rec_regions.size() == rec_rects.size()) {

				/* add a new region, but don't bother if they set use_rec_regions mid-record */

				MidiRegion::SourceList sources;

				rec_data_ready_connections.drop_connections ();

				boost::shared_ptr<MidiDiskstream> mds = _trackview.midi_track()->midi_diskstream();

				sources.push_back(mds->write_source());

				mds->write_source()->ViewDataRangeReady.connect 
					(rec_data_ready_connections, 
					 ui_bind (&MidiStreamView::rec_data_range_ready, this, _1, _2, boost::weak_ptr<Source>(mds->write_source())),
					 gui_context());

				// handle multi

				nframes_t start = 0;
				if (rec_regions.size() > 0) {
					start = rec_regions.back().first->start()
							+ _trackview.get_diskstream()->get_captured_frames(rec_regions.size()-1);
				}
				
				PropertyList plist; 
				
				plist.add (ARDOUR::Properties::start, start);
				plist.add (ARDOUR::Properties::length, 1);
				plist.add (ARDOUR::Properties::name, string());
				plist.add (ARDOUR::Properties::layer, 0);

				boost::shared_ptr<MidiRegion> region (boost::dynamic_pointer_cast<MidiRegion>
								      (RegionFactory::create (sources, plist, false)));

				assert(region);
				region->block_property_changes ();
				region->set_position (_trackview.session()->transport_frame(), this);
				rec_regions.push_back (make_pair(region, (RegionView*)0));

				// rec regions are destroyed in setup_rec_box

				/* we add the region later */
			}

			/* start a new rec box */

			boost::shared_ptr<MidiTrack> mt = _trackview.midi_track(); /* we know what it is already */
			boost::shared_ptr<MidiDiskstream> ds = mt->midi_diskstream();
			nframes_t frame_pos = ds->current_capture_start ();
			gdouble xstart = _trackview.editor().frame_to_pixel (frame_pos);
			gdouble xend;
			uint32_t fill_color;

			assert(_trackview.midi_track()->mode() == Normal);

			xend = xstart;
			fill_color = ARDOUR_UI::config()->canvasvar_RecordingRect.get();

			ArdourCanvas::SimpleRect * rec_rect = new Gnome::Canvas::SimpleRect (*canvas_group);
			rec_rect->property_x1() = xstart;
			rec_rect->property_y1() = 1.0;
			rec_rect->property_x2() = xend;
			rec_rect->property_y2() = (double) _trackview.current_height() - 1;
			rec_rect->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_RecordingRect.get();
			rec_rect->property_fill_color_rgba() = fill_color;
			rec_rect->lower_to_bottom();

			RecBoxInfo recbox;
			recbox.rectangle = rec_rect;
			recbox.start = _trackview.session()->transport_frame();
			recbox.length = 0;

			rec_rects.push_back (recbox);

			screen_update_connection.disconnect();
			screen_update_connection = ARDOUR_UI::instance()->SuperRapidScreenUpdate.connect (
					sigc::mem_fun (*this, &MidiStreamView::update_rec_box));
			rec_updating = true;
			rec_active = true;

		} else if (rec_active &&
			   (_trackview.session()->record_status() != Session::Recording ||
			    !_trackview.get_diskstream()->record_enabled())) {
			screen_update_connection.disconnect();
			rec_active = false;
			rec_updating = false;
		}

	} else {

		// cerr << "\tNOT rolling, rec_rects = " << rec_rects.size() << " rec_regions = " << rec_regions.size() << endl;

		if (!rec_rects.empty() || !rec_regions.empty()) {

			/* disconnect rapid update */
			screen_update_connection.disconnect();
			rec_data_ready_connections.drop_connections ();

			rec_updating = false;
			rec_active = false;

			/* remove temp regions */

			for (list<pair<boost::shared_ptr<Region>,RegionView*> >::iterator iter = rec_regions.begin(); iter != rec_regions.end();) {
				list<pair<boost::shared_ptr<Region>,RegionView*> >::iterator tmp;

				tmp = iter;
				++tmp;

				(*iter).first->drop_references ();

				iter = tmp;
			}

			rec_regions.clear();

			// cerr << "\tclear " << rec_rects.size() << " rec rects\n";

			/* transport stopped, clear boxes */
			for (vector<RecBoxInfo>::iterator iter=rec_rects.begin(); iter != rec_rects.end(); ++iter) {
				RecBoxInfo &rect = (*iter);
				delete rect.rectangle;
			}

			rec_rects.clear();

		}
	}
}

void
MidiStreamView::update_rec_regions (boost::shared_ptr<MidiModel> data, nframes_t start, nframes_t dur)
{
	ENSURE_GUI_THREAD (*this, &MidiStreamView::update_rec_regions, data, start, dur)

	if (use_rec_regions) {

		uint32_t n = 0;
		bool     update_range = false;

		for (list<pair<boost::shared_ptr<Region>,RegionView*> >::iterator iter = rec_regions.begin();
				iter != rec_regions.end(); n++) {

			list<pair<boost::shared_ptr<Region>,RegionView*> >::iterator tmp = iter;
			++tmp;

			if (!canvas_item_visible (rec_rects[n].rectangle)) {
				/* rect already hidden, this region is done */
				iter = tmp;
				continue;
			}

			boost::shared_ptr<MidiRegion> region = boost::dynamic_pointer_cast<MidiRegion>(iter->first);
			if (!region) {
				iter = tmp;
				continue;
			}

			nframes_t origlen = region->length();

			if (region == rec_regions.back().first && rec_active) {

				if (start >= region->midi_source(0)->timeline_position()) {

					nframes_t nlen = start + dur - region->position();

					if (nlen != region->length()) {

						region->freeze ();
						region->set_position (_trackview.get_diskstream()->get_capture_start_frame(n), this);
						region->set_length (start + dur - region->position(), this);
						region->thaw ();

						if (origlen == 1) {
							/* our special initial length */
							iter->second = add_region_view_internal (region, false);
							((MidiRegionView*)iter->second)->begin_write();
						}

						/* also update rect */
						ArdourCanvas::SimpleRect * rect = rec_rects[n].rectangle;
						gdouble xend = _trackview.editor().frame_to_pixel (region->position() + region->length());
						rect->property_x2() = xend;

						ARDOUR::BeatsFramesConverter tconv(_trackview.session()->tempo_map(), region->position());
						const MidiModel::TimeType start_beats = tconv.from(start);

						/* draw events */
						MidiRegionView* mrv = (MidiRegionView*)iter->second;

						for (MidiModel::Notes::const_iterator i = data->note_lower_bound(start_beats);
								i != data->notes().end(); ++i) {

							const boost::shared_ptr<MidiRegionView::NoteType>& note = *i;

							nframes_t note_start_frames = tconv.to(note->time());
							nframes_t note_end_frames   = tconv.to(note->end_time());

							if (note->length() > 0 && note_end_frames + region->position() > start)
								mrv->resolve_note(note->note(), note_end_frames);

							if (note_start_frames + region->position() < start) {
								continue;
							}

							if (note_start_frames + region->position() > start + dur) {
								break;
							}

							if (note->note() < _lowest_note) {
								_lowest_note = note->note();
								update_range = true;
							} else if (note->note() > _highest_note) {
								_highest_note = note->note();
								update_range = true;
							}

							mrv->add_note (note, !update_range);
						}

						mrv->extend_active_notes();
					}
				}

			} else {

				nframes_t nlen = _trackview.get_diskstream()->get_captured_frames(n);

				if (nlen != region->length()) {

					if (region->source_length(0) >= region->position() + nlen) {

						region->freeze ();
						region->set_position (_trackview.get_diskstream()->get_capture_start_frame(n), this);
						region->set_length (nlen, this);
						region->thaw ();

						if (origlen == 1) {
							/* our special initial length */
							iter->second = add_region_view_internal (region, false);
						}

						/* also hide rect */
						ArdourCanvas::Item * rect = rec_rects[n].rectangle;
						rect->hide();

					}
				}
			}

			iter = tmp;
		}

		if (update_range)
			update_contents_height();
	}
}

void
MidiStreamView::rec_data_range_ready (nframes_t start, nframes_t cnt, boost::weak_ptr<Source> weak_src)
{
	// this is called from the butler thread for now

	ENSURE_GUI_THREAD (*this, &MidiStreamView::rec_data_range_ready, start, cnt, weak_src)

	boost::shared_ptr<SMFSource> src (boost::dynamic_pointer_cast<SMFSource>(weak_src.lock()));

	if (!src) {
		return;
	}

	if (start + cnt > last_rec_data_frame) {
		last_rec_data_frame = start + cnt;
	}

	this->update_rec_regions (src->model(), start, cnt);
}

void
MidiStreamView::color_handler ()
{
	//case cMidiTrackBase:
	if (_trackview.is_midi_track()) {
		//canvas_rect->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_MidiTrackBase.get();
	}

	//case cMidiBusBase:
	if (!_trackview.is_midi_track()) {
		//canvas_rect->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_MidiBusBase.get();;
	}
}

void
MidiStreamView::note_range_adjustment_changed()
{
	double sum = note_range_adjustment.get_value() + note_range_adjustment.get_page_size();
	int lowest = (int) floor(note_range_adjustment.get_value());
	int highest;

	if (sum == _range_sum_cache) {
		//cerr << "cached" << endl;
		highest = (int) floor(sum);
	} else {
		//cerr << "recalc" << endl;
		highest = lowest + (int) floor(note_range_adjustment.get_page_size());
		_range_sum_cache = sum;
	}

	if (lowest == _lowest_note && highest == _highest_note) {
		return;
	}

	//cerr << "note range adjustment changed: " << lowest << " " << highest << endl;
	//cerr << "  val=" << v_zoom_adjustment.get_value() << " page=" << v_zoom_adjustment.get_page_size() << " sum=" << v_zoom_adjustment.get_value() + v_zoom_adjustment.get_page_size() << endl;

	_lowest_note = lowest;
	_highest_note = highest;
	apply_note_range(lowest, highest, true);
}