extends KinematicBody2D
# AI agent that uses the Seek behavior to hone in on the player's location as directly as possible.


onready var agent: = GSTSteeringAgent.new()
onready var accel: = GSTTargetAcceleration.new()
onready var seek: = GSTSeek.new(agent, player_agent)
onready var flee: = GSTFlee.new(agent, player_agent)
onready var _active_behavior: = seek

var player_agent: GSTAgentLocation
var velocity: = Vector2.ZERO
var start_speed: float
var start_accel: float


func _ready() -> void:
	agent.max_linear_acceleration = start_accel
	agent.max_linear_speed = start_speed


func _physics_process(delta: float) -> void:
	if not player_agent:
		return
	
	_update_agent()
	accel = _active_behavior.calculate_steering(accel)
	
	velocity = (velocity + Vector2(accel.linear.x, accel.linear.y)).clamped(agent.max_linear_speed)
	velocity = move_and_slide(velocity)


func _update_agent() -> void:
	agent.position.x = global_position.x
	agent.position.y = global_position.y
	agent.linear_velocity.x = velocity.x
	agent.linear_velocity.y = velocity.y


func _on_GUI_mode_changed(mode: int) -> void:
	if mode == 0:
		_active_behavior = seek
	else:
		_active_behavior = flee


func _on_GUI_accel_changed(value: float) -> void:
	agent.max_linear_acceleration = value


func _on_GUI_speed_changed(value: float) -> void:
	agent.max_linear_speed = value