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package fr.umlv.java.wallj.block;
import fr.umlv.java.wallj.board.Board;
import fr.umlv.java.wallj.board.PathFinder;
import fr.umlv.java.wallj.board.TileVec2;
import fr.umlv.java.wallj.context.Context;
import fr.umlv.java.wallj.context.GraphicsContext;
import fr.umlv.java.wallj.context.Stage;
import fr.umlv.java.wallj.event.*;
import fr.umlv.java.wallj.event.Event;
import org.jbox2d.common.Vec2;
import org.jbox2d.dynamics.World;
import java.awt.*;
import java.time.Duration;
import java.util.*;
import java.util.List;
/**
* A robot block.
*
* @author Pacien TRAN-GIRARD
*/
public class RobotBlock extends Block {
private static final float SPEED = 4f; // px/ms
private Vec2 pos;
private PathFinder pathFinder;
private Deque<TileVec2> path = new LinkedList<>();
RobotBlock(Vec2 pos) {
super(BlockType.ROBOT);
this.pos = pos;
}
@Override
public Vec2 getPos() {
return new Vec2(pos);
}
@Override
public void link(World world) {
// no-op
}
@Override
public void unlink(World world) {
// no-op
}
@Override
public List<Event> update(Context context) {
Events.findFirst(context.getEvents(), MoveRobotOrder.class)
.ifPresent(event -> updatePath(context.getGame().getCurrentStage().getBoard(), event.getTarget()));
move(context.getTimeDelta());
paint(context.getGraphicsContext());
return setupBomb(context.getEvents(), context.getGame().getCurrentStage());
}
private List<Event> setupBomb(List<Event> events, Stage stage) {
return Events.findFirst(events, BombSetupOrder.class)
.map(event -> isOnBomb(stage) ?
Collections.<Event>singletonList(new BombTimerIncrEvent(getTile())) :
Collections.<Event>singletonList(new BlockCreateEvent(BlockType.BOMB, getTile())))
.orElse(Collections.emptyList());
}
private void updatePath(Board board, TileVec2 target) {
if (!board.getBlockTypeAt(target).isTraversable()) return;
if (pathFinder == null) pathFinder = new PathFinder(board);
path = new LinkedList<>(pathFinder.findPath(TileVec2.of(pos), target));
}
private void move(Duration timeDelta) {
if (path.isEmpty()) return;
Vec2 dest = path.getFirst().toVec2();
Vec2 dir = dest.sub(pos);
float dist = dir.normalize();
Vec2 dp = dir.mul(timeDelta.toMillis() * SPEED);
pos = dp.length() < dist ? pos.add(dp) : path.removeFirst().toVec2();
}
private void paint(GraphicsContext graphicsContext) {
graphicsContext.paintCircle(Color.BLUE, getPos(), TileVec2.TILE_DIM / 2);
}
private boolean isOnBomb(Stage stage) {
return stage.getBlocks().stream()
.anyMatch(block -> Objects.equals(block.getType(), BlockType.BOMB) &&
Objects.equals(block.getPos(), getTile().toVec2()));
}
}
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