/*

    Copyright (C) 2015 Apple Inc. All Rights Reserved.

    See LICENSE.txt for this sample’s licensing information

    Abstract:

    Demonstrates avoid-obstacles behavior. Click (OS X) or touch (iOS) and drag and the agent follows the mouse/touch location, but avoids passing through the red obstacles.

 */

#import "AAPLAvoidScene.h"

#import "AAPLAgentNode.h"

@interface AAPLAvoidScene ()

@property AAPLAgentNode *player;

@property GKGoal *seekGoal;

@end

@implementation AAPLAvoidScene

- (NSString *)sceneName {

    return @"AVOID OBSTACLES";

}

- (void)didMoveToView:(nonnull SKView *)view {

    [super didMoveToView:view];

    // Add three obstacles in a triangle formation around the center of the scene.

    NSArray<GKObstacle *> *obstacles = @[

                                         [self addObstacleAtPoint:CGPointMake(CGRectGetMidX(self.frame),

                                                                              CGRectGetMidY(self.frame) + 150)],

                                         [self addObstacleAtPoint:CGPointMake(CGRectGetMidX(self.frame) - 200,

                                                                              CGRectGetMidY(self.frame) - 150)],

                                         [self addObstacleAtPoint:CGPointMake(CGRectGetMidX(self.frame) + 200,

                                                                              CGRectGetMidY(self.frame) - 150)],

                                         ];

    // The player agent follows the tracking agent.

    self.player = [[AAPLAgentNode alloc] initWithScene:self

                                                radius:AAPLDefaultAgentRadius

                                              position:CGPointMake(CGRectGetMidX(self.frame),

                                                                   CGRectGetMidY(self.frame))];

    self.player.agent.behavior = [[GKBehavior alloc] init];

    [self.agentSystem addComponent:self.player.agent];

    // Create the seek goal, but add it to the behavior only in -setSeeking:.

    self.seekGoal = [GKGoal goalToSeekAgent:self.trackingAgent];

    // Add an avoid-obstacles goal with a high weight to keep the agent from overlapping the obstacles.

    [self.player.agent.behavior setWeight:100 forGoal:[GKGoal goalToAvoidObstacles:obstacles maxPredictionTime:1]];

}

- (GKObstacle *)addObstacleAtPoint:(CGPoint)point {

    SKShapeNode *circleShape = [SKShapeNode shapeNodeWithCircleOfRadius:AAPLDefaultAgentRadius];

    circleShape.lineWidth = 2.5;

    circleShape.fillColor = [SKColor grayColor];

    circleShape.strokeColor = [SKColor redColor];

    circleShape.zPosition = 1;

    circleShape.position = point;

    [self addChild:circleShape];

    GKCircleObstacle *obstacle = [GKCircleObstacle obstacleWithRadius:AAPLDefaultAgentRadius];

    obstacle.position = (vector_float2){point.x, point.y};

    return obstacle;

}

- (void)setSeeking:(BOOL)seeking {

    [super setSeeking:seeking];

    // Switch between enabling seek and stop goals so that the agent stops when not seeking.

    if (seeking) {

        [self.player.agent.behavior setWeight:1 forGoal:self.seekGoal];

        [self.player.agent.behavior setWeight:0 forGoal:self.stopGoal];

    }

    else {

        [self.player.agent.behavior setWeight:0 forGoal:self.seekGoal];

        [self.player.agent.behavior setWeight:1 forGoal:self.stopGoal];

    }

}

@end