#include <iostream>
#include <cstdlib>   //for rand and exit functions
#include "rabbit.h"

//const char rabbit::c = 'r';   //not needed if line 8 of rabbit.h has = 'r'

rabbit::rabbit(game *initial_g, unsigned initial_x, unsigned initial_y)
	: g(initial_g), x(initial_x), y(initial_y)
{
	if (c == g->term.background()) {
		cerr << "Rabbit character '" << c << "' can't be the same as "
			"the terminal's background character.\n";
		exit(EXIT_FAILURE);
	}

	if (!g->term.in_range(x, y)) {
		cerr << "rabbit out of range: (" << x << ", " << y << ")\n";
		exit(EXIT_FAILURE);
	}

	while (g->term.get(x, y) != g->term.background()) {
		g->term.next(x, y);
		if (!g->term.in_range(x, y)) {
			cerr << "No free space for rabbit.\n";
			exit(EXIT_FAILURE);
		}
	}

	g->term.put(x, y, c);
	g->master.push_back(this);
}

rabbit::~rabbit()
{
	g->term.beep();
	g->master.remove(this);
	g->term.put(x, y);
}

//If this rabbit blundered into the wolf and got eaten, return false.
//Otherwise, return true.

bool rabbit::move()
{
	//The values of dx and dy are either 1, 0, or -1.
	const int dx = rand() % 3 - 1;
	const int dy = rand() % 3 - 1;

	if (dx == 0 && dy == 0) {
		return true;   //This rabbit had no desire to move.
	}

	const unsigned newx = x + dx;
	const unsigned newy = y + dy;

	if (!g->term.in_range(newx, newy)) {
		return true;   //Can't move off the screen.
	}

	const char newc = g->term.get(newx, newy);

	if (newc != g->term.background()) {
		//Return true if this rabbit bumped into another rabbit.
		//Return false if it blundered into the wolf and was eaten.
		return newc == c;
	}

	g->term.put(x, y);      //Erase the rabbit from its old location.
	x = newx;
	y = newy;
	g->term.put(x, y, c);   //Redraw this rabbit at its new location.

	return true;
}