// copyright Min Zhong, cs838 proj2, April, 2000


#include "viewer.h"
#include "RunButton.h"
#include "Marker.h"

// vector v2 = glmat * v1, glmat is a col major mat
void glmat44_mult_vec41(double *mat, double *v1, double *v2) 
{
	for (int i=0; i<4; i++) 
		v2[i] = mat[i]*v1[0] + mat[i+4]*v1[1] + mat[i+8]*v1[2] + mat[i+12]*v1[3];

}



// curtesy of gleicher's code
// a quick and dirty hack for rotating the eyepoint
// note: although this is modeled after the virtual sphere, its
// much simple and (probably) not as good
// it takes a lookat/eye pair and moves the eye around the lookat point
//	based on some wierd notions of how far to go, given how far the mouse moved
//  from the beginning
// the fundamental flaw of this method is that it rotates around fixed axes
// so, in a way, its instructive to use it to learn about gimbal lock
// I often find that I cannot rotate the world the way that i want with this 
// interface
void orbit(int mx, int my, double lx, double ly, double lz, 
                                                   double ex, double ey, double ez,
                                                   double& rx, double& ry, double& rz)
{
        // 
        // first - if the mouse motion is small, return to starting position
        // this should make it easier to move around 1 axis
        if (mx<0) {
                mx = mx+5;
                if (mx>0) mx = 0;
        } else {
                mx = mx-5;
                if (mx<0) mx = 0;
        }
        if (my<0) {
                my = my+5;
                if (my>0) my = 0;
        } else {
                mx = mx-5;
                if (my<0) my = 0;
        }
        // make the center of the coordinate system be the lookat point so that's
        // where we rotate about
        ex -= lx;
        ey -= ly;
        ez -= lz;
        // horizontal motions rotate around the vertical (y axis) by an amount
        // proportional to the amount the mouse moved - the amount is pretty
        // arbitrary
        double hz = ((double) mx) / 200;
        double sx = sin(hz);
        double cx = cos(hz);
        rx = cx * ex - sx * ez;
        rz = sx * ex + cx * ez;
        // note: rotating around the z (or x) axis isn't really right, but its
        // easy
        double vt = ((double) my) / 200;
        double sz = sin(vt);
        double cz = cos(vt);
        ex = rx;        // for safe keeping
        rx = cz * ex - sz * ey;
        ry = sz * ex + cz * ey;

        // shift the result back so that the lookat point is in the right place
        rx += lx;
        ry += ly;
        rz += lz;
}



// the guts of the slider - 
void runSliderCB(Fl_Widget* in_slider, Fl_Widget* in_wind)
{
	RunSlider *slider = (RunSlider *)in_slider;
	Panel    *wind   = (Panel *)in_wind;

	wind->key_addB->value(0);
	wind->key_rmvB->value(0);
	wind->gl->damage(1);
}



// switch bw real time and const spd play back
void play_modeCB(Fl_Widget* wid, Fl_Widget *container)
{
	RunButton *but = (RunButton *)wid;
	Gl_Win *win	= (Gl_Win *)container;

	if (win->play_mode == REAL_TIME) {
		win->play_mode = CONST_SPD;
		but->value(0);
	}
	else if (win->play_mode == CONST_SPD) {
		win->play_mode = REAL_TIME;
		but->value(1);
	}

	win->runBut->init_ticks(win->frame_time, win->play_mode);	
	win->damage(1);
}



// remove all keys
void key_clearCB(Fl_Widget* wid, Fl_Widget *container)
{
	Fl_Round_Button *but = (Fl_Round_Button *)wid;
	Panel   *wind   = (Panel *)container;
	Gl_Win	*gl		= wind->gl;

	but->value(1);
	gl->key_cnt = 0;	// set key cnt to 0
	
	if (gl->e_interpType != HIDE && gl->e_interpType != NONE) 
		gl->e_interpType = HIDE;
	wind->euler_browser->value(HIDE);

	if (gl->q_interpType != HIDE && gl->q_interpType != NONE)
		gl->q_interpType = HIDE;
	wind->quat_browser->value(HIDE);

	if (gl->m_interpType != HIDE && gl->m_interpType != NONE)
		gl->m_interpType = HIDE;
	wind->emap_browser->value(HIDE);

	but->value(0);

	wind->damage(1);

}


// print all keys
void key_printCB(Fl_Widget* wid, Fl_Widget *container)
{
	Fl_Round_Button *but = (Fl_Round_Button *)wid;
	Gl_Win  *win = (Gl_Win *)container;	
	
	but->value(1);
	win->disp_keyTimes();
	
	but->value(0);

}


// key the frame slider is at
void key_addCB(Fl_Widget* wid, Fl_Widget *container)
{
	Fl_Round_Button *but = (Fl_Round_Button *)wid;
	Panel  *wind = (Panel *)container;	
	Gl_Win	*gl	= wind->gl;

	if (gl->keyTimes == NULL) {
		fl_alert("Load Motion file first.");
		but->value(0);
	}	
	else {
		but->value(1);
		if ( gl->key_add((int) gl->timeS->value()) == SUCCESS ) {
			wind->key_rmvB->value(0);	// turn off remove but if it were on at that frame
			wind->damage(1);
		}
	}
}


// remove this key
void key_rmvCB(Fl_Widget* wid, Fl_Widget *container)
{

	Fl_Round_Button *but = (Fl_Round_Button *)wid;
	Panel	*wind = (Panel *)container;	
	Gl_Win	*gl	= wind->gl;
		
	if (gl->keyTimes == NULL) {
		fl_alert("Load Motion file first.");
		but->value(0);
	}	
	else {
		but->value(1);

		if ( gl->key_remove((int) gl->timeS->value()) == SUCCESS ) {
			wind->key_addB->value(0);	// turn off the key_add but

			if (gl->key_cnt == 0) {	// no interp allowed if no key
	
				if (gl->e_interpType != HIDE && gl->e_interpType != NONE) 
					gl->e_interpType = HIDE;
				wind->euler_browser->value(HIDE);

				if (gl->q_interpType != HIDE && gl->q_interpType != NONE)
					gl->q_interpType = HIDE;
				wind->quat_browser->value(HIDE);

				if (gl->m_interpType != HIDE && gl->m_interpType != NONE)
					gl->m_interpType = HIDE;
				wind->emap_browser->value(HIDE);
			}

			wind->damage(1);
		}
		else {
			fl_alert("This frame was not keyed.");
		}

	}

}


// sets up gl_win's keytimes array to key every nth frame.
void key_nthCB(Fl_Widget* wid, Fl_Widget *container)
{
	Fl_Int_Input *but = (Fl_Int_Input *)wid;
	Panel  *win = (Panel *)container;	

	int		nth = atoi( but->value() );

	if (win->gl->keyTimes == NULL) {
		fl_alert("Load Motion file first.");
		but->value(0);
	}	
	else if (nth >= win->gl->frame_cnt ||	nth <= 0 )
		fl_alert("invalid nth frame. Range: [1, %d]", win->gl->frame_cnt-1 );
	else if (win->gl->key_nth( nth ) == SUCCESS) 
		win->damage(1);
}


// begin frame button cb
void beginCB(Fl_Widget* wid, Fl_Widget *container)
{
	Fl_Int_Input *but = (Fl_Int_Input *)wid;
	Gl_Win  *win = (Gl_Win *)container;	
	int		new_begin = atoi( but->value() );
	char	s_old_begin[10];

	if (new_begin == win->begin || new_begin < 0 )	{// no change
		fl_alert("invalid beginning. Range: [0, %d]", win->frame_cnt-1 );
		// reset to old val
		_itoa(win->begin, s_old_begin, 10);
		but->value(s_old_begin);
		return;
	}

	win->begin = new_begin;
	win->timeS->range(new_begin, win->end);
	win->timeS->minimum(new_begin);
	win->runBut->init_ticks(win->frame_time, win->play_mode);
		
}



// end frame button cb
void endCB(Fl_Widget* wid, Fl_Widget *container)
{
	Fl_Int_Input *but = (Fl_Int_Input *)wid;
	Gl_Win  *win = (Gl_Win *)container;	
	int		new_end = atoi( but->value() );
	char	s_old_end[10];

	if (new_end == win->end || new_end >= win->frame_cnt )	{// no change

		fl_alert("invalid end. Range: [0, %d]", win->frame_cnt-1 );
		// reset to old val
		_itoa(win->end, s_old_end, 10);
		but->value(s_old_end);
		return;
	}

	win->end = new_end;
	win->timeS->range(win->begin, new_end);
	win->timeS->maximum(new_end);		
	win->runBut->init_ticks(win->frame_time, win->play_mode);
}


// open input file button callback
void in_motion_fileCB(Fl_Widget* wid, Fl_Widget *container)
{
	char s_val[10];

	Fl_Button *but = (Fl_Button *)wid;
	Panel  *win = (Panel *)container;
	Gl_Win *gl = win->gl;

	gl->read_input_file(win);
	
	if (gl->b_readSuceed) {
		_itoa(0, s_val, 10);
		win->key_nthB->value(s_val);

		win->emap_browser->value(HIDE);
		win->euler_browser->value(NONE);
		win->quat_browser->value(NONE);
		win->damage(1);
	}
	else  
		fl_alert("invalid motion file.\n");

}


// load marker request file
void in_marker_fileCB(Fl_Widget* wid, Fl_Widget *container)
{
	Fl_Button *but = (Fl_Button *)wid;
	Gl_Win  *win = (Gl_Win *)container;

	if (win->cap == NULL) {
		fl_alert("Load Motion file first.");
	}	
	else if (win->read_marker_request(win->marker_head) == SUCCESS) {
	
		if (win->calc_markers_pos(win->marker_head, win->m_rotType) == SUCCESS)
			win->damage(1);
		else
			fl_alert("Invalid Joint in marker file.");
	}
}


// write marker coord to file
void out_marker_fileCB(Fl_Widget* wid, Fl_Widget *container)
{
	Fl_Button *but = (Fl_Button *)wid;
	Gl_Win  *win = (Gl_Win *)container;

	if (win->cap == NULL) {
		fl_alert("Load Motion file first.");
	}	
	else 
		win->export_markers(win->marker_head);
}


// choose whether and how to show markers (which rotation to use)
void marker_rotType_browserCB(Fl_Widget* wid, Fl_Widget *container)
{

	Fl_Hold_Browser *b = (Fl_Hold_Browser *)wid;
	Gl_Win  *win = (Gl_Win *)container;

	RotType old_m = win->m_rotType;

	switch (b->value()) {
	case 1:
		win->m_rotType = EULER;
		break;
	case 2:
		win->m_rotType = QUAT;
		break;
	case 3:
		win->m_rotType = EXPMAP;
		break;
	default:
		return;

	}

	if (win->m_rotType != old_m) {

		win->calc_markers_pos(win->marker_endsite, win->m_rotType);	// recalc for all endsites
		if (win->marker_head != NULL)
			if (win->calc_markers_pos(win->marker_head, win->m_rotType) != SUCCESS)
				fl_alert("Invalid Joint in marker file.");	// should't happen

		win->damage(1);
	}

}


// choose euler interp options and invoke appropriate interp routine
void euler_browserCB(Fl_Widget* wid, Fl_Widget *container)
{

	Fl_Hold_Browser *b = (Fl_Hold_Browser *)wid;
	Gl_Win  *win = (Gl_Win *)container;

	InterpType old_interp = win->e_interpType;

	switch (b->value()) {
	case 1:
		win->e_interpType = HIDE;
		break;
	case 2:
		win->e_interpType = NONE;		
		break;
	case 3:
		if (win->key_cnt < 2) {
			fl_alert("set more keys first.");
			b->value(old_interp);
			return;
		}
		else {
			win->e_interpType = LINEAR;
			if (old_interp != win->e_interpType )
				win->b_need_reinterp = true;
		}
		break;

	case 4:
		if (win->key_cnt < 4) {
			fl_alert("set more keys first.");
			b->value(old_interp);
			return;
		}
		else {
			win->e_interpType = CARDINAL;
			if (old_interp != win->e_interpType )
				win->b_need_reinterp = true;
		}
		break;

	default:
		return;
	}

	if (old_interp != HIDE && old_interp != NONE 
		&& (win->e_interpType == NONE || win->e_interpType == HIDE) 
		&& win->m_rotType == EULER) {
		// going from interp ->non-interp

		win->calc_markers_pos(win->marker_endsite, EULER);
		if (win->marker_head != NULL) 
			win->calc_markers_pos(win->marker_head, EULER);
		
	}
	win->damage(1);

}



// choose quat interp options and invoke appropriate interp routine
void quat_browserCB(Fl_Widget* wid, Fl_Widget *container)
{

	Fl_Hold_Browser *b = (Fl_Hold_Browser *)wid;
	Gl_Win  *win = (Gl_Win *)container;
	InterpType old_interp = win->q_interpType;

	switch (b->value()) {
	case 1:
		win->q_interpType = HIDE;
		break;
	case 2:
		win->q_interpType = NONE;		
		break;
	case 3:
		if (win->key_cnt < 2) {
			fl_alert("set more keys first.");
			b->value(old_interp);
			return;
		}
		else {
			win->q_interpType = SLERP;
			if (old_interp != win->q_interpType )
				win->b_need_reinterp = true;
		}
		break;

	case 4:
		if (win->key_cnt < 4) {
			fl_alert("set more keys first.");
			b->value(old_interp);
			return;
		}
		else {
			win->q_interpType = Q_BERZIER;
			if (old_interp != win->q_interpType )
				win->b_need_reinterp = true;
		}
		break;

	default:
		return;
	}

	if (old_interp != HIDE && old_interp != NONE 
		&& (win->q_interpType == NONE || win->q_interpType == HIDE) 
		&& win->m_rotType == QUAT) {
		// going from interp ->non-interp

		win->calc_markers_pos(win->marker_endsite, QUAT);
		if (win->marker_head != NULL) 
			win->calc_markers_pos(win->marker_head, QUAT);		
	}

	win->damage(1);

}


// choose exp map interp options and invoke appropriate interp routine
void emap_browserCB(Fl_Widget* wid, Fl_Widget *container)
{

	Fl_Hold_Browser *b = (Fl_Hold_Browser *)wid;
	Gl_Win  *win = (Gl_Win *)container;
	InterpType old_interp = win->m_interpType;

	switch (b->value()) {
	case 1:
		win->m_interpType = HIDE;		
		break;
	case 2:
		win->m_interpType = NONE;
		break;
	case 3:
		if (win->key_cnt < 2) {
			fl_alert("set more keys first.");
			b->value(old_interp);
			return;
		} else {
			win->m_interpType = EM_SLERP;
			if (old_interp != win->m_interpType )
				win->b_need_reinterp = true;		
		}
		break;

	case 4:
		if (win->key_cnt < 2) {
			fl_alert("set more keys first.");
			b->value(old_interp);
			return;
		} else {
			win->m_interpType = EM_LIN;
			if (old_interp != win->m_interpType )
				win->b_need_reinterp = true;		
		}
		break;

	case 5:
		if (win->key_cnt < 4) {
			fl_alert("set more keys first.");
			b->value(old_interp);
			return;
		}
		else {
			win->m_interpType = CARDINAL;			
			if (old_interp != win->m_interpType )
				win->b_need_reinterp = true;
		}
		break;

	default:
		return;
	}

	if (old_interp != HIDE && old_interp != NONE 
		&& (win->m_interpType == NONE || win->m_interpType == HIDE) 
		&& win->m_rotType == EXPMAP) {
		// going from interp ->non-interp

		win->calc_markers_pos(win->marker_endsite, EXPMAP);
		if (win->marker_head != NULL) 
			win->calc_markers_pos(win->marker_head, EXPMAP);		
	}

	win->damage(1);
}


// sel camera view
void camera_browserCB(Fl_Widget* wid, Fl_Widget *container)
{
	Fl_Hold_Browser *b = (Fl_Hold_Browser *)wid;
	Gl_Win  *win = (Gl_Win *)container;

	switch( b->value() ) {
	case OMIN:

		win->cameraView = OMIN;
		break;

	case FOLLOW:

		if ( win->cap == NULL )	{ // no motion file loaded
			fl_alert("Load Motion file first.");
			b->value(OMIN);
			return;
		}
		else 
			win->cameraView = FOLLOW;

		break;

	default:
		return;
	}

	win->damage(1);

}


// sel markers to be drawn
void marker_sel_browserCB(Fl_Widget* wid, Fl_Widget *container)
{
	Fl_Multi_Browser *b = (Fl_Multi_Browser *)wid;
	Gl_Win  *win = (Gl_Win *)container;

	int cnt = b->size();
	for (int i=1; i<=cnt; i++) {
		if (b->selected(i))
			(win->endsites_draw)[i-1].b_draw = true;		
		else
			(win->endsites_draw)[i-1].b_draw = false;
	}

	win->damage(1);
}