/*
 * Hydrogen
 * Copyright(c) 2002-2005 by Alex >Comix< Cominu [comix@users.sourceforge.net]
 *
 * http://www.hydrogen-music.org
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * $Id: LayerPreview.cpp,v 1.20 2005/06/14 13:54:06 comix Exp $
 *
 */
#include <qpainter.h>
#include <qcursor.h>

#include "gui/Skin.h"
#include "gui/HydrogenApp.h"
#include "lib/Hydrogen.h"
#include "lib/Song.h"
#include "InstrumentEditor.h"
#include "LayerPreview.h"


LayerPreview::LayerPreview( QWidget* pParent )
 : QWidget( pParent , "LayerPreview", Qt::WRepaintNoErase | Qt::WResizeNoErase )
 , Object( "LayerPreview" )
 , m_bChanged( true )
 , m_pInstrument( NULL )
 , m_nSelectedLayer( 0 )
 , m_bMouseGrab( false )
{
	infoLog( "INIT" );

	setMouseTracking( true );

	int w = 234;
	int h = 20 + m_nLayerHeight * MAX_LAYERS;
	resize( w, h );

	m_pixmap.resize( width(), height() );


	m_speakerPixmap.load( QString( Skin::getImagePath().append("/instrumentEditor/speaker.png").c_str() ) );

	HydrogenApp::getInstance()->addEventListener( this );
}



LayerPreview::~ LayerPreview()
{
	infoLog( "DESTROY" );
}



void LayerPreview::drawBackground()
{
	m_pixmap.fill( QColor( 58, 62, 72 ) );

	QPainter p( &m_pixmap );

	int nLayers = 0;
	for ( int i = 0; i < MAX_LAYERS; i++ ) {
		InstrumentLayer *pLayer = m_pInstrument->getLayer( i );
		if ( pLayer ) {
			nLayers++;
		}
	}

	int nLayer = 0;
	for ( int i = MAX_LAYERS - 1; i >= 0; i-- ) {
		InstrumentLayer *pLayer = m_pInstrument->getLayer( i );
		int y = 20 + m_nLayerHeight * i;

		if ( pLayer ) {
			int x1 = pLayer->m_fStartVelocity * width();
			int x2 = pLayer->m_fEndVelocity * width();

			int red = 128.0 / nLayers * nLayer;
			int green = 134.0 / nLayers * nLayer;
			int blue = 152.0 / nLayers * nLayer;
			QColor layerColor( red, green, blue );

			p.fillRect( x1, 0, x2 - x1, 19, layerColor );
			p.setPen( QColor( 230, 230, 230 ) );
			p.drawText( x1, 0, x2 - x1, 20, Qt::AlignCenter, QString("%1").arg( i + 1 ) );

			if ( i == m_nSelectedLayer ) {
				p.setPen( QColor( 210, 0, 0 ) );
			}
			else {
				p.setPen( QColor( 128, 134, 152 ) );
			}
			p.drawRect( x1, 1, x2 - x1 , 19 );	// bordino in alto

			// layer view
			p.fillRect( 0, y, width(), m_nLayerHeight, QColor( 25, 44, 65 ) );
			p.fillRect( x1, y, x2 - x1, m_nLayerHeight, QColor( 90, 160, 233 ) );
			p.drawRect( 0, y, width(), m_nLayerHeight );

			nLayer++;
		}
		else {
			if ( i == m_nSelectedLayer ) {
				p.setPen( QColor( 210, 0, 0 ) );
			}
			else {
				p.setPen( QColor( 128, 134, 152 ) );
			}

			// layer view
			p.fillRect( 0, y, width(), m_nLayerHeight, QColor( 59, 73, 96 ) );
			p.drawRect( 0, y, width(), m_nLayerHeight );
		}
	}
}



void LayerPreview::paintEvent(QPaintEvent *ev)
{
	if ( !isVisible() ) {
		return;
	}
	if ( m_bChanged ) {
		m_bChanged = false;
//		infoLog( "paint");
		drawBackground();
	}
	bitBlt(this, 0, 0, &m_pixmap, 0, 0, width(), height(), CopyROP);
}



void LayerPreview::selectedInstrumentChangedEvent()
{
	Hydrogen::getInstance()->lockEngine("LayerPreview::selectedInstrumentChangedEvent" );
	Song *pSong = Hydrogen::getInstance()->getSong();
	if (pSong != NULL) {
		InstrumentList *pInstrList = pSong->getInstrumentList();
		int nInstr = Hydrogen::getInstance()->getSelectedInstrumentNumber();
		if (nInstr == -1) {
			m_pInstrument = NULL;
		}
		else {
			m_pInstrument = pInstrList->get( nInstr );
		}
	}
	else {
		m_pInstrument = NULL;
	}
	Hydrogen::getInstance()->unlockEngine();

	// select the last valid layer
	if ( m_pInstrument ) {
		for (int i = MAX_LAYERS - 1; i >= 0; i-- ) {
			if ( m_pInstrument->getLayer( i ) ) {
				m_nSelectedLayer = i;
				break;
			}
		}
	}
	else {
		m_nSelectedLayer = 0;
	}

	m_bChanged = true;
	update();
}



void LayerPreview::mouseReleaseEvent(QMouseEvent *ev)
{
	m_bMouseGrab = false;
	setCursor( QCursor( Qt::ArrowCursor ) );
}



void LayerPreview::mousePressEvent(QMouseEvent *ev)
{
	const unsigned nPosition = 0;
	const float fPan_L = 1.0f;
	const float fPan_R = 1.0f;
	const int nLenght = -1;
	const float fPitch = 0.0f;
	
	if ( !m_pInstrument ) {
		return;
	}
	if ( ev->y() < 20 ) {
		float fVelocity = (float)ev->x() / (float)width();

		Note *note = new Note( m_pInstrument, nPosition, fVelocity, fPan_L, fPan_R, nLenght, fPitch );
		note->setInstrument( m_pInstrument );
		Hydrogen::getInstance()->noteOn( note );

		for ( int i = 0; i < MAX_LAYERS; i++ ) {
			InstrumentLayer *pLayer = m_pInstrument->getLayer( i );
			if ( pLayer ) {
				if ( ( fVelocity > pLayer->m_fStartVelocity ) && ( fVelocity < pLayer->m_fEndVelocity ) ) {
					if ( i != m_nSelectedLayer ) {
						m_nSelectedLayer = i;
						m_bChanged = true;
						update();
						HydrogenApp::getInstance()->getInstrumentEditor()->selectLayer( m_nSelectedLayer );
					}
					break;
				}
			}
		}
	}
	else {
		m_nSelectedLayer = ( ev->y() - 20 ) / m_nLayerHeight;
		InstrumentLayer *pLayer = m_pInstrument->getLayer( m_nSelectedLayer );

		m_bChanged = true;
		update();
		HydrogenApp::getInstance()->getInstrumentEditor()->selectLayer( m_nSelectedLayer );

		if ( m_pInstrument->getLayer( m_nSelectedLayer ) ) {
			Note *note = new Note( m_pInstrument , nPosition, m_pInstrument->getLayer( m_nSelectedLayer )->m_fEndVelocity - 0.01, fPan_L, fPan_R, nLenght, fPitch );
			Hydrogen::getInstance()->noteOn( note );
		}

		if ( pLayer ) {
			int x1 = pLayer->m_fStartVelocity * width();
			int x2 = pLayer->m_fEndVelocity * width();

			if ( ( ev->x() < x1  + 5 ) && ( ev->x() > x1 - 5 ) ){
				setCursor( QCursor( Qt::SizeHorCursor ) );
				m_bGrabLeft = true;
				m_bMouseGrab = true;
			}
			else if ( ( ev->x() < x2 + 5 ) && ( ev->x() > x2 - 5 ) ){
				setCursor( QCursor( Qt::SizeHorCursor ) );
				m_bGrabLeft = false;
				m_bMouseGrab = true;
			}
			else {
				setCursor( QCursor( Qt::ArrowCursor ) );
			}
		}
	}
}



void LayerPreview::mouseMoveEvent( QMouseEvent *ev )
{
	int x = ev->pos().x();
	int y = ev->pos().y();

	float fVel = (float)x / (float)width();
	if (fVel < 0 ) {
		fVel = 0;
	}
	else  if (fVel > 1) {
		fVel = 1;
	}

	if ( y < 20 ) {
		setCursor( QCursor( m_speakerPixmap ) );
		return;
	}
	if ( m_bMouseGrab ) {
		InstrumentLayer *pLayer = m_pInstrument->getLayer( m_nSelectedLayer );
		if ( pLayer ) {
			if ( m_bMouseGrab ) {
				if ( m_bGrabLeft ) {
					if ( fVel < pLayer->m_fEndVelocity ) {
						pLayer->m_fStartVelocity = fVel;
					}
				}
				else {
					if ( fVel > pLayer->m_fStartVelocity ) {
						pLayer->m_fEndVelocity = fVel;
					}
				}
				m_bChanged = true;
				update();
			}
		}
	}
	else {
		m_nSelectedLayer = ( ev->y() - 20 ) / m_nLayerHeight;
		if ( m_nSelectedLayer < MAX_LAYERS ) {
			InstrumentLayer *pLayer = m_pInstrument->getLayer( m_nSelectedLayer );
			if ( pLayer ) {
				int x1 = pLayer->m_fStartVelocity * width();
				int x2 = pLayer->m_fEndVelocity * width();

				if ( ( x < x1  + 5 ) && ( x > x1 - 5 ) ){
					setCursor( QCursor( Qt::SizeHorCursor ) );
				}
				else if ( ( x < x2 + 5 ) && ( x > x2 - 5 ) ){
					setCursor( QCursor( Qt::SizeHorCursor ) );
				}
				else {
					setCursor( QCursor( Qt::ArrowCursor ) );
				}
			}
			else {
				setCursor( QCursor( Qt::ArrowCursor ) );
			}
		}
	}
}



void LayerPreview::updateAll()
{
	m_bChanged = true;
	update();
}