
/*******************************************************************************/
/* Copyright (C) 2008 Jonathan Moore Liles                                     */
/*                                                                             */
/* 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; see the file COPYING.  If not,write to the Free Software */
/* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
/*******************************************************************************/

#include "Sequence.H"
#include "Timeline.H"

#include <FL/fl_draw.H>

#include "Track.H"

#include "FL/event_name.H"

#include "Transport.H" // for locate()

#include "const.h"
#include "debug.h"

using namespace std;



queue <Sequence_Widget *> Sequence::_delete_queue;



Sequence::Sequence ( Track *track, const char *name ) : Fl_Group( 0, 0, 0, 0 ), Loggable( true  )
{
    init();

    _track = track;

    if ( name )
        _name = strdup( name );

//    log_create();
}

Sequence::Sequence ( int X, int Y, int W, int H ) : Fl_Group( X, Y, W, H ), Loggable( false )
{
    init();
}

void
Sequence::init ( void )
{
    _track = NULL;

    _name = NULL;

    box( FL_FLAT_BOX );
    color(  FL_BACKGROUND_COLOR );
    align( FL_ALIGN_LEFT );

    end();
//    clear_visible_focus();
}


Sequence::~Sequence (  )
{
    DMESSAGE( "destroying sequence" );

    if ( _widgets.size() )
        FATAL( "programming error: leaf destructor must call Sequence::clear()!" );

    if ( parent() )
        parent()->remove( this );

    if ( _name )
        free( _name );
}



int
Sequence::drawable_w ( void ) const
{
    return w() - Track::width();
}

int
Sequence::drawable_x ( void ) const
{
    return x() + Track::width();
}

void
Sequence::log_children ( void ) const
{
    if ( id() > 0 )
        log_create();

    for ( std::list <Sequence_Widget*>::const_iterator i = _widgets.begin();
          i != _widgets.end(); ++i )
        (*i)->log_create();
}

/** remove all widgets from this sequence */
void
Sequence::clear ( void )
{
    Loggable::block_start();

    while ( _widgets.size() )
        delete _widgets.front();

    Loggable::block_end();
}

/** given screen pixel coordinate X, return an absolute frame offset into this sequence */
nframes_t
Sequence::x_to_offset ( int X )
{
    return timeline->xoffset + timeline->x_to_ts( X - x() );
}

/** sort the widgets in this sequence by position */
void
Sequence::sort ( void )
{
    _widgets.sort( Sequence_Widget::sort_func );
}

/** return a pointer to the widget that /r/ overlaps, or NULL if none. */
Sequence_Widget *
Sequence::overlaps ( Sequence_Widget *r )
{
    for ( list <Sequence_Widget *>::const_iterator i = _widgets.begin(); i != _widgets.end(); i++ )
    {
        if ( *i == r ) continue;
        if ( (*i)->overlaps( r ) )
            return *i;
    }

    return NULL;
}

void
Sequence::handle_widget_change ( nframes_t start, nframes_t length )
{
    /* this might be invoked from Capture or GUI thread */
//    Fl::lock();
    sort();
    timeline->damage_sequence();
//    Fl::unlock();

//    timeline->update_length( start + length );
}

Sequence_Widget *
Sequence::widget_at ( nframes_t ts, int Y )
{
    for ( list <Sequence_Widget *>::const_reverse_iterator r = _widgets.rbegin(); r != _widgets.rend(); ++r )
        if ( ts >= (*r)->start() && ts <= (*r)->start() + (*r)->length()
             && Y >= (*r)->y() && Y <= (*r)->y() + (*r)->h() )
            return (*r);

    return NULL;
}

/** return a pointer to the widget under the current mouse event, or
 * NULL if no widget intersects the event coordinates */
Sequence_Widget *
Sequence::event_widget ( void )
{
    nframes_t ets = timeline->xoffset + timeline->x_to_ts( Fl::event_x() - drawable_x() );
    return widget_at( ets, Fl::event_y() );
}

void
Sequence::add ( Sequence_Widget *r )
{
//    Logger _log( this );

    if ( r->sequence() == this )
    {
        WARNING( "Programming error: attempt to add sequence widget to the same sequence twice" );
        return;
    }

    if ( r->sequence() )
    {
        /* This method can be called from the Capture thread as well as the GUI thread, so we must lock FLTK before redraw */
        r->redraw();
        r->sequence()->remove( r );
    }

    r->sequence( this );

    _widgets.push_back( r );

    handle_widget_change( r->start(), r->length() );
}

void
Sequence::remove ( Sequence_Widget *r )
{
    _widgets.remove( r );

    handle_widget_change( r->start(), r->length() );
}

static nframes_t
abs_diff ( nframes_t n1, nframes_t n2 )
{
    return n1 > n2 ? n1 - n2 : n2 - n1;
}

/** snap widget /r/ to nearest edge */
void
Sequence::snap ( Sequence_Widget *r )
{
    const int snap_pixels = 10;
    const nframes_t snap_frames = timeline->x_to_ts( snap_pixels );

    /* snap to other widgets */
    if ( Timeline::snap_magnetic )
    {
        const int rx1 = r->start();
        const int rx2 = r->start() + r->length();

        for ( list <Sequence_Widget*>::const_iterator i = _widgets.begin(); i != _widgets.end(); i++ )
        {
            const Sequence_Widget *w = (*i);

            if ( w == r )
                continue;

            const int wx1 = w->start();
            const int wx2 = w->start() + w->length();

            if ( abs_diff( rx1, wx2 ) < snap_frames )
            {
                r->start( w->start() + w->length() + 1 );

                return;
            }

            if ( abs_diff( rx2, wx1 ) < snap_frames )
            {
                r->start( ( w->start() - r->length() ) - 1 );

                return;
            }
        }
    }

    nframes_t f = r->start();

    /* snap to beat/bar lines */
    if ( timeline->nearest_line( &f ) )
        r->start( f );
}


void
Sequence::draw_box ( void )
{
    /* draw the box with the ends cut off. */
    Fl_Group::draw_box( box(), x() - Fl::box_dx( box() )  - 1, y(), w() + Fl::box_dw( box() ) + 2, h(), color() );
}
                                                            
void
Sequence::draw ( void )
{
    if ( damage() & ~FL_DAMAGE_USER1 )
    {
        Fl_Boxtype b = box();
        box( FL_NO_BOX );
        
        Fl_Group::draw();
        
        box( b );
    }

    fl_push_clip( drawable_x(), y(), drawable_w(), h() );

    draw_box();

    for ( list <Sequence_Widget *>::const_iterator r = _widgets.begin();  r != _widgets.end(); ++r )
            (*r)->draw_box();


    for ( list <Sequence_Widget *>::const_iterator r = _widgets.begin();  r != _widgets.end(); ++r )
            (*r)->draw();

    int X, Y, W, H;

    fl_clip_box( x(), y(), w(), h(), X, Y, W, H );

    timeline->draw_measure_lines( X, Y, W, H );

    for ( list <Sequence_Widget *>::const_iterator r = _widgets.begin();  r != _widgets.end(); ++r )
        (*r)->draw_label();

    fl_pop_clip();
}

#include "FL/test_press.H"

int
Sequence::handle ( int m )
{

/*     if ( m != FL_NO_EVENT ) */
/*         DMESSAGE( "%s", event_name( m ) ); */

//            if ( m == FL_RELEASE )
    if ( ! Fl::pushed() )
        Sequence_Widget::pushed( NULL );

    switch ( m )
    {
        case FL_KEYBOARD:
        case FL_SHORTCUT:
            if ( Fl::test_shortcut( FL_CTRL + FL_Right ) )
            {
                const Sequence_Widget *w = next( transport->frame );
                
                if ( w )
                    transport->locate( w->start() );

                return 1;
            }
            else if ( Fl::test_shortcut( FL_CTRL + FL_Left ) )
            {
                const Sequence_Widget *w = prev( transport->frame );
                
                if ( w )
                    transport->locate( w->start() );

                return 1;
            }
            else if ( Fl::test_shortcut( FL_CTRL + ' ' ) )
            {
                Sequence_Widget *r = widget_at( transport->frame, y() );

                if ( r )
                {
                    if ( r->selected() )
                        r->deselect();
                    else
                        r->select();
                }
            }
            else
            {
                switch ( Fl::event_key() )
                {
                    case FL_Left:
                    case FL_Right:
                    case FL_Up:
                    case FL_Down:
                        /* this is a hack to override FLTK's use of arrow keys for
                         * focus navigation */
                        return timeline->handle_scroll( m );
                    default:
                        break;
                }
            }

            if ( Sequence_Widget::belowmouse() )
                return Sequence_Widget::belowmouse()->dispatch( m );
        case FL_NO_EVENT:
            /* garbage from overlay window */
            return 0;
        case FL_FOCUS:
            Fl_Group::handle( m );
            redraw();
            return 1;
        case FL_UNFOCUS:
            Fl_Group::handle( m );
            redraw();
            return 1;
        case FL_LEAVE:
//            DMESSAGE( "leave" );
            fl_cursor( FL_CURSOR_DEFAULT );
            Fl_Group::handle( m );
            return 1;
      case FL_ENTER:
//            DMESSAGE( "enter" );
            if ( Fl::event_x() >= drawable_x() )
            {
                if ( Sequence_Widget::pushed() )
                {
                    if ( Sequence_Widget::pushed()->sequence()->class_name() == class_name() )
                    {
                        /* accept objects dragged from other sequences of this type */
                        if ( Sequence_Widget::pushed()->sequence() != this )
                        {
                            timeline->sequence_lock.wrlock();
                            add( Sequence_Widget::pushed() );
                            timeline->sequence_lock.unlock();
                            
                            damage( FL_DAMAGE_USER1 );
                            
                            fl_cursor( FL_CURSOR_MOVE );
                        }
                    }
                    else
                        fl_cursor( FL_CURSOR_DEFAULT );
                }
                else
                    if ( ! event_widget() )
                        fl_cursor( cursor() );
            
                Fl_Group::handle( m );
                
                return 1;
            }
            else
            {
                return Fl_Group::handle(m);
            }
        case FL_DND_DRAG:
        case FL_DND_ENTER:
        case FL_DND_LEAVE:
        case FL_DND_RELEASE:
            if ( Fl::event_x() >= drawable_x() )
                return 1;
            else
                return 0;
        case FL_MOVE:
        {
            if ( Fl::event_x() >= drawable_x() )
            {
                Sequence_Widget *r = event_widget();
                
                if ( r != Sequence_Widget::belowmouse() )
                {
                    if ( Sequence_Widget::belowmouse() )
                        Sequence_Widget::belowmouse()->handle( FL_LEAVE );
                    
                    Sequence_Widget::belowmouse( r );
                    
                    if ( r )
                        r->handle( FL_ENTER );
                }
            }

            return 1;
        }
        default:
        {
            if ( m != FL_DRAG &&
                 m != FL_RELEASE &&
                 Fl::event_x() < drawable_x() )
                return 0;

            Sequence_Widget *r = Sequence_Widget::pushed() ? Sequence_Widget::pushed() : event_widget();

/*             if ( this == Fl::focus() ) */
/*                 DMESSAGE( "Sequence widget = %p", r ); */

            if ( m == FL_RELEASE )
                Sequence_Widget::pushed( NULL );

            if ( r )
            {
                int retval = r->dispatch( m );

/*                 DMESSAGE( "retval = %d", retval ); */

                if ( m == FL_PUSH )
                    take_focus();

                if ( retval )
                {
                    if ( m == FL_PUSH )
                    {
                        if ( Sequence_Widget::pushed() )
                            Sequence_Widget::pushed()->handle( FL_UNFOCUS );

                        Sequence_Widget::pushed( r );

                        r->handle( FL_FOCUS );
                    }
                }

                if ( _delete_queue.size() )
                {
                    Loggable::block_start();
                    
                    while ( _delete_queue.size() )
                    {
                        Sequence_Widget *t = _delete_queue.front();
                        _delete_queue.pop();
                        
                        if ( Sequence_Widget::pushed() == t )
                            Sequence_Widget::pushed( NULL );
                        if ( Sequence_Widget::belowmouse() == t )
                        {
                            Sequence_Widget::belowmouse()->handle( FL_LEAVE );
                            Sequence_Widget::belowmouse( NULL );
                        }

                        timeline->sequence_lock.wrlock();
                        delete t;
                        timeline->sequence_lock.unlock();
                }

                    Loggable::block_end();
                }

                if ( m == FL_PUSH )
                    return 1;
                else
                    return retval;
            }
            else
            {
                if ( test_press( FL_BUTTON1 ) )
                {
                    /* traditional selection model */
                    Sequence_Widget::select_none();
                }

                return Fl_Group::handle( m );
            }
        }
    }
}



/**********/
/* Public */
/**********/

/** calculate the length of this sequence by looking at the end of the
 * least widget it contains */

/** return the length in frames of this sequence calculated from the
 * right edge of the rightmost widget */
    nframes_t
        Sequence::length ( void ) const
    {
        nframes_t l = 0;

        for ( list <Sequence_Widget *>::const_iterator r = _widgets.begin(); r != _widgets.end(); ++r )
            l = max( l, (*r)->start() + (*r)->length() );

        return l;
    }

/** return the location of the next widget from frame /from/ */
const Sequence_Widget *
        Sequence::next ( nframes_t from ) const
    {
        for ( list <Sequence_Widget*>::const_iterator i = _widgets.begin(); i != _widgets.end(); i++ )
//            if ( (*i)->start() >= from )
            if ( (*i)->start() > from )
                return *i;

        if ( _widgets.size() )
            return _widgets.back();
        else
            return 0;
    }

/** return the location of the next widget from frame /from/ */
const Sequence_Widget *
        Sequence::prev ( nframes_t from ) const
    {
        for ( list <Sequence_Widget*>::const_reverse_iterator i = _widgets.rbegin(); i != _widgets.rend(); i++ )
            if ( (*i)->start() < from )
                return *i;

        if ( _widgets.size() )
            return _widgets.front();
        else
            return 0;
    }

/** delete all selected widgets in this sequence */
    void
        Sequence::remove_selected ( void )
    {
        Loggable::block_start();

        for ( list <Sequence_Widget *>::iterator r = _widgets.begin(); r != _widgets.end(); )
            if ( (*r)->selected() )
            {
                Sequence_Widget *t = *r;
                _widgets.erase( r++ );
                delete t;
            }
            else
                ++r;

        Loggable::block_end();
    }

/** select all widgets intersecting with the range defined by the
 * pixel coordinates X through W */
    void
        Sequence::select_range ( int X, int W )
    {
        nframes_t sts = x_to_offset( X );
        nframes_t ets = sts + timeline->x_to_ts( W );

        for ( list <Sequence_Widget *>::const_reverse_iterator r = _widgets.rbegin();  r != _widgets.rend(); ++r )
            if ( ! ( (*r)->start() > ets || (*r)->start() + (*r)->length() < sts ) )
                (*r)->select();
    }
