(function() {
"use strict";

var ButcherSystem = function() {
    this.initialize();
}
var p = ButcherSystem.prototype = new creatine.System();

    p.initialize = function() {
        this._removeQueue = [];
    }

    p.process = function(boids, wolfs) {
        for (var i=boids.length-1; i>=0; i--) {
            var b = boids[i];

            if (this._verifyDeathSquare(b) ||
                this._verifyPredator(b, wolfs)) {

                b.getComponent('Flock').dead = true;
                boids.splice(i, 1);
            }
        }
    }

    p.getRemoveQueue = function() {
        return this._removeQueue;
    }

    p._verifyDeathSquare = function(b) {
        var px = b.display.x;
        var py = b.display.y;
        var tx = toCoordX(px);
        var ty = toCoordY(py);
        var death = registry.map.getLayerByName('area_death');

        if (px < -5 || px > canvas.width+5 ||
            py < -5 || py > canvas.height+5 || getTile(death, tx, ty)) {
            this._removeQueue.push(b);
            return true;
        }
    }

    p._verifyPredator = function(b, wolfs) {
        for (var i=0; i<wolfs.length; i++) {
            var wolf = wolfs[i];
            var d = dist(b.display.x, b.display.y, wolf.display.x, wolf.display.y);
            if (d < WOLF_KILL_DISTANCE) {
                this._removeQueue.push(b);
                return true;
            }
        }
    }
    

window.ButcherSystem = ButcherSystem;

})();