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/* 
   client/camera.cc
   This file is part of the Osirion project and is distributed under 
   the terms and conditions of the GNU General Public License version 2 
*/

#include "camera.h"

#include "gl/osiriongl.h"
#include "game/game.h"
#include "common/functions.h"

using common::degrees360f;
using common::degrees180f;

namespace client
{

Camera::Camera() 
{
	pitch_track = -15.0f; 
	offset_inc = 5.0f; 

	yaw_current = 0;
	yaw_target = 0; 

	pitch_current = pitch_track * 2; 
	pitch_target = pitch_track; 

	distance = 0.4f;

	mode = Track;
}

Camera::~Camera()
{
}

void Camera::draw(float elapsed) 
{	
	if (mode == Track) {
		yaw_target = game::ship.yaw();
	}

	// adjust yaw
	float d = degrees180f(yaw_current - yaw_target);
	yaw_current = degrees360f( yaw_current - d * elapsed) ;
	
	// adjust pitch target
	d = degrees180f(pitch_current - pitch_target);
	pitch_current = degrees360f( pitch_current - d *elapsed);

	switch (mode) {
	case Free:
		gl::translate(1.0f+distance, -distance/2, 0.0f);
		gl::rotate(-pitch_current, 0, 0, 1.0f);
		gl::rotate(-yaw_current, 0, 1.0f, 0);
		break;
	case Track:
		gl::translate(1.0f+distance, -distance , 0.0f);
		gl::rotate(-pitch_current, 0, 0, 1.0f);
		gl::rotate(-yaw_current, 0, 1.0f, 0);
		break;
	default:
		break;
	}
}

void Camera::rotate_right()
{
	if (mode == Free ) {
		yaw_target = degrees360f(  yaw_target + offset_inc);
	}
}

void Camera::rotate_left()
{
	if (mode == Free ) {
		yaw_target = degrees360f(  yaw_target - offset_inc);
	}
}

void Camera::rotate_up()
{
	if (mode == Free ) {
		pitch_target = pitch_target - offset_inc;
		if (pitch_target < -90.0f) pitch_target = -90.0f;
	}
}

void Camera::rotate_down()
{
	if (mode == Free ) {
		pitch_target = pitch_target + offset_inc;
		if (pitch_target > 90.0f) pitch_target = 90.0f;
	}
}

void Camera::nextmode() {
	switch(mode) {
	case Free:
		// switch camera to Track mode
		mode = Track;
		yaw_target = game::ship.yaw();
		yaw_current = yaw_target;
		pitch_target = pitch_track;
		pitch_current = pitch_target;
		break;
	case Track:
		// switch camera to Free mode
		mode = Free;
		yaw_target = game::ship.yaw();
		yaw_current = yaw_target;
		pitch_target = pitch_track;
		pitch_current = pitch_target;
		break;
	default:
		break;
	}
}

} //namespace camera