/* MORTON - sample simple bot.  attacks, avoids walls (sort of), and dodges bullets
   To compile: gcc -o morton morton.c -lxpilot_ai
   or, if necessary: gcc -o morton morton.c -lxpilot_ai -L/path/to/libxpilot_ai/ -I/path/to/xpilot_ai.h/
   then to run, type: ./morton "-join localhost -team 3"
   or, for no command line arguments: ./morton ""
*/

#include "xpilot_ai.h"
#include <string.h>
#include <math.h>

int main (int argc, char **argv) 
{
	char launchstring[512];
	
	/*set max turn speed to 20 degrees per frame*/
	AI_setmaxturn (20);
	/* launch xpilot with a ship named "Morton", using the command line args */
	strcpy(launchstring, argv[1]);
	strcat(launchstring, " -name Morton");
	AI_xpilot_setargs(launchstring);
	AI_xpilot_launch();
	
	return 1;
}

/*wall_feeler checks for walls at some degree and range from self ship */

int wall_feeler(int range, int degree);
int wall_feeler(int range, int degree) {
	int res = AI_wallbetween(AIself_x(), AIself_y(), AIself_x() +  range * cos( rad (degree)), AIself_y() + range * sin(rad( degree)));
	if (res == -1) 
		return range;
		return res;
}

/* gets nearest enemy on screen or returns -1 if no enemy */
int screen_enemy_num (int n);
int screen_enemy_num (int n) {
	if (AIship_x(n) == -1) return -1;
	else if (AI_teamplay() == 1 && AIself_team() != AIship_team(n)) return n;
	else return screen_enemy_num(n + 1);
}

/* gets nearest enemy on radar or -1 if none */
int radar_enemy_num (int n);
int radar_enemy_num (int n) {
	if (AIradar_x(n) == -1) return -1;
	else if (AIradar_enemy(n) == 1) return n;
	else return radar_enemy_num(n + 1);
}


/* libxpilot_ai.so defines a void function called AImain() that it calls every frame.  If you redefine it, it will call your function instead. */

void AImain(void) {
	int shipnum = screen_enemy_num(0);
	int rshipnum = radar_enemy_num(0);
	int wall_feeler1 = wall_feeler(500, angleadd(AIself_track(), -15));
	int wall_feeler2 = wall_feeler(500, angleadd(AIself_track(), 15));

	/* Dodge bullet if dangerous */
	if (AIshot_alert(0) > -1 && AIshot_alert(0) < 80) {
		AIself_turn(anglediff(AIself_heading(), angleadd(AIshot_idir(0), 90)));
		AIself_thrust(1);
	}
	/* Turn and shoot at nearest enemy ship on screen */
	else if (shipnum > -1) {
		AIself_turn(anglediff(AIself_heading(), AIship_aimdir(shipnum)));
		AIself_shoot(1);
	}
	/* Turn to radar ship, thrust if not going to fast, shoot otherwise */
	else if (rshipnum > -1) {
		AIself_turn(anglediff(AIself_heading(), AIradar_xdir(rshipnum)));
		if (AIself_vel() < 10)
			AIself_thrust(1);
		else
			AIself_shoot(1);
	}		

					
	/* dodges walls.  Two feelers out front at -15 and 15 degrees from track tell Morton the best way to turn to avoid the wall. */
	
	
	if (wall_feeler1 == wall_feeler2 && wall_feeler1 < (20 * AIself_vel()) && AIself_vel() > 1) {
		AIself_turn(anglediff(AIself_heading(), angleadd(180, AIself_track())));
		AIself_thrust(1);
	}
	else if (wall_feeler1 < wall_feeler2 && wall_feeler1 < (20 * AIself_vel()) && AIself_vel() > 1) {
		AIself_turn(anglediff(AIself_heading(), angleadd(180, angleadd(-15, AIself_track()))));
		AIself_thrust(1);
	}
	else if (wall_feeler1 > wall_feeler2 && wall_feeler2 < (20 * AIself_vel()) && AIself_vel() > 1) {
		AIself_turn(anglediff(AIself_heading(), angleadd(180, angleadd(15, AIself_track()))));
		AIself_thrust(1);
	}
	return;
}