extends KinematicBody
class_name Character

enum States {
	Alive,
	Dead
}

enum GroundType {
	DIRT,
	WATER,
	WOOD,
	METAL,
	SAND,
	GRASS
}

signal health_changed
signal died
signal changed_weapon
signal fired(projectile)
signal pickup_weapon
signal jumped

var UI: Control
export var max_weapons: int = 5
var weapons: Array = []
var current_weapon: Weapon
var is_in_water: bool = false
export var weapon_refpt_right: NodePath
export var weapon_refpt_left: NodePath
export var water_splash_sound: AudioStreamSample
var animation_blend_vector = Vector2.ZERO
export var animation_tree_path: NodePath
var animation_tree: AnimationTree


# Move
var velocity := Vector3()
var move_axis: Vector3 = Vector3.ZERO
var can_sprint := true
var sprinting := false
const FLOOR_NORMAL := Vector3.UP
export var sprint_speed := 16.0
export var acceleration := 8
export var deacceleration := 100
export(float, 0.0, 1.0, 0.00001) var air_control := 0.001
export var can_jump = true
export var jump_height := 5
export var floor_max_angle := 90.0
export var gravity: float = 40.0
export var walk_speed: float = 2.0
export var ground_friction: float = 3.0

var ground_type = GroundType.DIRT

var footstep_sounds = {}

export var health = 100
var state = States.Alive

func has_weapon(weapon: Weapon) -> bool:
	if get_similar_weapon(weapon):
		return true
	else:
		return false

func get_similar_weapon(weapon: Weapon) -> Weapon:
	for weap in weapons:
		if weap.name == weapon.name:
			return weap
	return null

func can_pickup_weapon(weapon: Weapon) -> bool:
	return has_weapon(weapon) or len(weapons) < max_weapons

func pickup_weapon(weapon: Weapon) -> Weapon:
	var similar = get_similar_weapon(weapon)
	if similar:
		similar.current_ammo = clamp(similar.current_ammo + weapon.current_ammo, 0, weapon.max_ammo)
		return similar
	else:
		# add new weapon
		weapons.append(weapon)
		weapon.holder = self
		weapon.visible = false
		if weapon.held_hand == Weapon.WeaponHeld.Left:
			get_node(weapon_refpt_left).add_child(weapon)
		else:
			get_node(weapon_refpt_right).add_child(weapon)
		return weapon
		
func take_damage(hitpts: float):
	health -= hitpts
	emit_signal("health_changed")
	if health <= 0:
		die()
		
func get_current_weapon():
	return current_weapon
		
func die():
	state = States.Dead
	emit_signal("died")
	
func set_weapon_slot(slot: int):
	if current_weapon:
		current_weapon.visible = false
	var newweapon = weapons[slot]
	current_weapon = newweapon
	current_weapon.visible = true
	current_weapon.play_switch_sound()

func play_footstep():
	if ground_type in footstep_sounds:
		var sound = footstep_sounds[ground_type][randi() % len(footstep_sounds[ground_type])]
		Globals.play_sound(sound, Globals.Bus.Sounds, self)

func get_current_weapon_slot():
	return get_weapon_slot(current_weapon)
	
func get_weapon_slot(weapon: Weapon):
	var i = 0
	for weap in weapons:
		if weap == weapon:
			return i
		i+=1
	return i
	
func create_weapon(weapon_scene: PackedScene):
	var weapon = weapon_scene.instance()
	if weapon is Weapon:
		return weapon
	else:
		weapon.queue_free()
		return null
	
func switch_next_weapon_slot():
	var weapon_slot = 0
	if get_current_weapon_slot() != len(weapons) - 1:
		weapon_slot = get_current_weapon_slot() + 1
	set_weapon_slot(weapon_slot)

func enter_water(force: float):
	is_in_water = true
	ground_type = GroundType.WATER
	if abs(force) >= 50:
		Globals.play_sound(water_splash_sound, Globals.Bus.Sounds, self)
	
func exit_water(force: float):
	is_in_water = false
	ground_type = GroundType.GRASS
	
func _ready():
	if animation_tree_path:
		animation_tree = get_node(animation_tree_path)
	
func _physics_process(delta):
	if Engine.editor_hint:
		return
		
	walk(delta)
		
	if not animation_tree:
		return
	if not Globals.process_3d_inputs:
		return
	# Blend nicely between animations
	var movement_vector = Vector2.ZERO
	if Input.is_action_pressed("move_forward"):
		movement_vector.y = 1
	if Input.is_action_pressed("move_backward"):
		movement_vector.y = -1
	if Input.is_action_pressed("move_right"):
		movement_vector.x = 1
	if Input.is_action_pressed("move_left"):
		movement_vector.x = -1
	var res = animation_blend_vector.linear_interpolate(movement_vector, delta*10)
	animation_tree.set("parameters/movement/blend_position", res)
	animation_blend_vector = res

func _process(delta):
	if Engine.editor_hint:
		return
	if Globals.process_3d_inputs:
		move_axis.x = Input.get_action_strength("move_forward") - Input.get_action_strength("move_backward")
		move_axis.y = Input.get_action_strength("move_right") - Input.get_action_strength("move_left")

func fire_pressed():
	current_weapon.activate(Globals.target_position["position"])

func fire_released():
	current_weapon.deactivate(Globals.target_position["position"])

func walk(delta: float) -> void:
	# Input
	var direction = Vector3()
	var aim: Basis = get_global_transform().basis
	if move_axis.x >= 0.5:
		direction -= aim.z
	if move_axis.x <= -0.5:
		direction += aim.z
	if move_axis.y <= -0.5:
		direction -= aim.x
	if move_axis.y >= 0.5:
		direction += aim.x
	direction.y = 0
	direction = direction.normalized()
	
	# Jump
	var _snap: Vector3
	if can_jump and is_on_floor():
		_snap = Vector3.DOWN
		if Input.is_action_just_pressed("move_jump"):
			_snap = Vector3.ZERO
			velocity.y = jump_height
			emit_signal("jumped")
	
	# Apply Gravity
	velocity.y -= gravity * delta
	# if is_in_water:
	#	velocity.y = 0
	
	# Sprint
	var _speed: float
	if Globals.process_3d_inputs and Input.is_action_pressed("move_sprint") and can_sprint and move_axis.x == 1:
		_speed = sprint_speed
		sprinting = true
	else:
		_speed = walk_speed
		sprinting = false
	
	# Acceleration and Deacceleration
	# where would the player go
	var _temp_vel: Vector3 = velocity
	_temp_vel.y = 0
	var _target: Vector3 = direction * _speed
	var _temp_accel: float
	if direction.dot(_temp_vel) > 0:
		_temp_accel = acceleration
	else:
		_temp_accel = deacceleration
	if not is_on_floor():
		_temp_accel *= air_control
	# interpolation
	_temp_vel = _temp_vel.linear_interpolate(_target, _temp_accel * delta)
	velocity.x = _temp_vel.x
	velocity.z = _temp_vel.z
	# clamping (to stop on slopes)
	if direction.dot(velocity) == 0:
		var _vel_clamp := 1
		if velocity.x < _vel_clamp and velocity.x > -_vel_clamp:
			velocity.x = 0
		if velocity.z < _vel_clamp and velocity.z > -_vel_clamp:
			velocity.z = 0
	
	# Move
	velocity = move_and_slide(velocity, FLOOR_NORMAL, true, 4, deg2rad(floor_max_angle))
	# velocity.y = move_and_slide_with_snap(velocity, _snap, FLOOR_NORMAL, true, 4, deg2rad(floor_max_angle)).y