#ifndef WORLD_H
#define WORLD_H

#include <common.h> // For HLINE, vec2, OpenGL utilities, etc.

/*
 *	World - creates and handles an area of land
*/
class World {
private:
	/*
	 *	struct line_t
	 * 
	 *	The world is stored in an array of lines. Example:
	 * 
	 *		 	||       
	 *			|||  || |
	 *	 		|||||||||
	 * line no. 123456789...
	 * 
	 */
	struct line_t {
		float y;
		unsigned char color;
	} __attribute__ ((packed)) *line;
	unsigned int lineCount;	// Size of the array 'line' (aka the width of the world)
	int x_start;			// Worlds are centered on the x axis (0,n), this contains
							// where to start drawing the world to have it centered properly.
	World *behind,*infront;	// Pointers to other areas of land that are behind or in front of this one, respectively.
public:
	World *toLeft,*toRight;		// Pointers to areas to the left and right of this world. These are made public
								// so that they can easily be set without a function.
								
	World(unsigned int width);	// Generates a world of width 'width'.
	~World(void);				// Frees the 'line' array.
	
	void addLayer(unsigned int width);					// Generates a new world and makes 'behind' point to it. If 'behind'
														// already points to a world, the new world will be set to be behind 'behind'.
														
	void draw(vec2 *vec);								// Draws the world around the coordinates 'vec'
	
	void detect(vec2 *v,vec2 *vel,const float width);	// Insures objects/entities at location 'v' with a width of 'width' and a
														// velocity of 'vel' stay outside of the ground (defined by array 'line'),
														// and handles gravity for that object/entity by modifying it's velocity ('vel')
	
	World *goWorldLeft(vec2 *loc,const float width);	// Returns the world to the left of this one if it exists and the player at
														// location 'loc' with width 'width' is at the left edge of this world.
	World *goWorldRight(vec2 *loc,const float width);	// Functions the same as goWorldLeft(), but checks/returns the world to the right
														// of the player.
														
	World *goWorldBack(vec2 *loc,const float width);	// Returns the address of the world behind this one if it exists and the player
														// at location 'loc' with width 'width' is within the area of it (i.e., when this
														// world is drawn the world has to appear directly behind the player)
	World *goWorldFront(vec2 *loc,const float width);	// Functions the same as goWorldBack(), but checks/returns the world in front of
														// this one.
};

#endif // WORLD_H