module TK.SpaceTac.Specs {
    testing("Target", test => {
        test.case("initializes from ship or location", check => {
            var target: Target;

            target = Target.newFromLocation(2, 3);
            check.equals(target.x, 2);
            check.equals(target.y, 3);
            check.equals(target.ship_id, null);

            var ship = new Ship();
            ship.arena_x = 4;
            ship.arena_y = -2.1;
            target = Target.newFromShip(ship);
            check.equals(target.x, 4);
            check.equals(target.y, -2.1);
            check.equals(target.ship_id, ship.id);
        });

        test.case("gets distance to another target", check => {
            var t1 = Target.newFromLocation(5, 1);
            var t2 = Target.newFromLocation(6, 2);
            check.nears(t1.getDistanceTo(t2), Math.sqrt(2));
        });

        test.case("gets angle to another target", check => {
            var t1 = Target.newFromLocation(2, 3);
            var t2 = Target.newFromLocation(4, 5);
            check.nears(t1.getAngleTo(t2), Math.PI / 4);
        });

        test.case("snaps to a grid", check => {
            let grid = new HexagonalArenaGrid(5, 1);
            check.equals(Target.newFromLocation(1, 1).snap(grid), Target.newFromLocation(0, 0), "1,1");
            check.equals(Target.newFromLocation(6, 4).snap(grid), Target.newFromLocation(7.5, 5), "6,4");
            let ship = new Ship();
            check.equals(new Target(6, 4, ship).snap(grid), new Target(7.5, 5, ship), "6,4,ship");
        });
    });
}