extends Entity

# Copyright Péter Magyar relintai@gmail.com
# MIT License, functionality from this class needs to be protable to the entity spell system

# Copyright (c) 2019-2020 Péter Magyar

# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

#export (String) var map_path : String
export(float) var max_visible_distance : float = 120 setget set_max_visible_distance
var max_visible_distance_squared : float = max_visible_distance * max_visible_distance

const ray_length = 1000
const ACCEL : float = 100.0
const DEACCEL : float = 100.0
const GRAVITY : float = -24.8
const JUMP_SPEED : float = 3.8
const MAX_SLOPE_ANGLE : float = 40.0

var _on : bool = true

var y_rot : float = 0.0

var vel : Vector3 = Vector3()
var dir : Vector3 = Vector3()
var target_movement_direction : Vector2 = Vector2()

var animation_tree : AnimationTree
var anim_node_state_machine : AnimationNodeStateMachinePlayback = null
var animation_run : bool = false

var moving : bool = false
var sleep : bool = false
var dead : bool = false
var death_timer : float = 0

var _world : VoxelWorld = null

func _ready() -> void:
	animation_tree = get_character_skeleton().get_animation_tree()
	
	if animation_tree != null:
		anim_node_state_machine = animation_tree["parameters/playback"]

	animation_tree["parameters/run-loop/blend_position"] = Vector2(0, -1)

	ai_state = EntityEnums.AI_STATE_PATROL
	
func _enter_tree():
	_world = get_node("..") as VoxelWorld
	
	set_process(true)
	set_physics_process(true)

	
func _process(delta : float) -> void:
	if dead:
		death_timer += delta
		
		if death_timer > 60:
			queue_free()
		
		return
		
	
	var camera : Camera = get_tree().get_root().get_camera() as Camera
	
	if camera == null:
		return
	
	var cam_pos : Vector3 = camera.global_transform.xform(Vector3())
	var dstv : Vector3 = cam_pos - get_body().translation
	dstv.y = 0
	var dst : float = dstv.length_squared()

	if dst > max_visible_distance_squared:
		if get_body().visible:
			get_body().hide()
		return
	else:
#		var lod_level : int = int(dst / max_visible_distance_squared * 3.0)

		if dst < 400: #20^2
			get_character_skeleton().set_lod_level(0)
		elif dst > 400 and dst < 900: #20^2, 30^2
			get_character_skeleton().set_lod_level(1)
		else:
			get_character_skeleton().set_lod_level(2)
		
		if not get_body().visible:
			get_body().show()

func _physics_process(delta : float) -> void:
	if not _on:
		return
	
	if sentity_data == null:
		return
		
	if dead:
		return
		
	if _world != null:
		if not _world.is_position_walkable(get_body().transform.origin):
			return
	
	process_movement(delta)

func process_movement(delta : float) -> void:
	if starget != null:
		get_body().look_at(starget.get_body().translation, Vector3(0, 1, 0))
	
	var state : int = getc_state()
	
	if state & EntityEnums.ENTITY_STATE_TYPE_FLAG_ROOT != 0 or state & EntityEnums.ENTITY_STATE_TYPE_FLAG_STUN != 0:
		moving = false
		return
	
	if target_movement_direction.length_squared() > 0.1:
		if anim_node_state_machine != null and not animation_run:
			anim_node_state_machine.travel("run-loop")
			animation_run = true
		
		target_movement_direction = target_movement_direction.normalized()
		moving = true
	else:
		if anim_node_state_machine != null and animation_run:
			anim_node_state_machine.travel("idle-loop")
			animation_run = false
			
		moving = false
	
	if target_movement_direction.x > 0.1 or target_movement_direction.y > 0.1 or target_movement_direction.x < -0.1 or target_movement_direction.y < -0.1:
		y_rot = Vector2(0, 1).angle_to(target_movement_direction)
		
		var forward : Vector3 = Vector3(0, 0, 1).rotated(Vector3(0, 1, 0), deg2rad(y_rot)) 
		var right : Vector3 = forward.cross(Vector3(0, 1, 0)) * -target_movement_direction.x
		forward *= target_movement_direction.y #only potentially make it zero after getting the right vector
	
		dir = forward
		dir += right
		
		if dir.length_squared() > 0.1:
			dir = dir.normalized()
			
		moving = true
	else:
		dir = Vector3()
		moving = false
		
	if not moving and sleep:
		return
		
	if moving and sleep:
		sleep = false

	vel.y += delta * GRAVITY

	var hvel : Vector3 = vel
	hvel.y = 0

	var target : Vector3 = dir
	target *= get_speed().ccurrent

	var accel
	if dir.dot(hvel) > 0:
		accel = ACCEL
	else:
		accel = DEACCEL

	hvel = hvel.linear_interpolate(target, accel * delta) as Vector3
	vel.x = hvel.x
	vel.z = hvel.z
	
	var facing : Vector3 = vel
	facing.y = 0
	
	vel = get_body().move_and_slide(vel, Vector3(0,1,0), false, 4, deg2rad(MAX_SLOPE_ANGLE))
	sset_position(get_body().translation, get_body().rotation)
	
	if vel.length_squared() < 0.12:
		sleep = true
	
	if get_body().translation.y < -50.0:
		print("killed mob with fall damage")
		var sdi : SpellDamageInfo = SpellDamageInfo.new()
		sdi.damage_source_type = SpellDamageInfo.DAMAGE_SOURCE_UNKNOWN
		sdi.damage = 999999999
		stake_damage(sdi)

func rotate_delta(x_delta : float) -> void:
	y_rot += x_delta
	
	if y_rot > 360:
		y_rot = 0
	if y_rot < 0:
		y_rot = 360
	
	get_body().rotation_degrees = Vector3(0.0, y_rot, 0.0)

func sstart_attack(entity : Entity) -> void:
	ai_state = EntityEnums.AI_STATE_ATTACK
	
	starget = entity
	
func _onc_mouse_enter() -> void:
	if centity_interaction_type == EntityEnums.ENITIY_INTERACTION_TYPE_LOOT:
		Input.set_default_cursor_shape(Input.CURSOR_CROSS)
	else:
		Input.set_default_cursor_shape(Input.CURSOR_MOVE)
		
func _onc_mouse_exit() -> void:
	Input.set_default_cursor_shape(Input.CURSOR_ARROW)
	
func _son_death():
	if dead:
		return
	
	if starget == null:
		queue_free()
		return
		
	#warning-ignore:unused_variable
	for i in range(gets_aura_count()):
		removes_aura(gets_aura(0))
	
	dead = true
	
	var ldiff : float = scharacter_level - starget.scharacter_level + 10.0
	
	if ldiff < 0:
		ldiff = 0
		
	if ldiff > 15:
		ldiff = 15
		
	ldiff /= 10.0
	
	starget.adds_xp(int(5.0 * scharacter_level * ldiff))
		
	starget = null
	
	sentity_interaction_type = EntityEnums.ENITIY_INTERACTION_TYPE_LOOT
	ai_state = EntityEnums.AI_STATE_OFF
	
	anim_node_state_machine.travel("dead")
	
#	set_process(false)
	set_physics_process(false)
	
remote func set_position(position : Vector3, rotation : Vector3) -> void:
	if get_tree().is_network_server():
		rpc("set_position", position, rotation)

func _son_damage_dealt(data):
	if ai_state != EntityEnums.AI_STATE_ATTACK and data.dealer != self:
		sstart_attack(data.dealer)

func _con_damage_dealt(info : SpellDamageInfo) -> void:
#	if info.dealer == 
	WorldNumbers.damage(get_body().translation, 1.6, info.damage, info.crit)

func _con_heal_dealt(info : SpellHealInfo) -> void:
	WorldNumbers.heal(get_body().translation, 1.6, info.heal, info.crit)

func _moved() -> void:
	if sis_casting():
		sfail_cast()
		
func set_max_visible_distance(var value : float) -> void:
	max_visible_distance_squared = value * value
	
	max_visible_distance = value

#func _setup():
#	sentity_name = sentity_data.text_name
	
func _son_xp_gained(value : int) -> void:
	if not ESS.get_resource_db().get_xp_data().can_character_level_up(gets_character_level()):
		return
	
	var xpr : int = ESS.get_resource_db().get_xp_data().get_character_xp(gets_character_level());
	
	if xpr <= scharacter_xp:
		scharacter_levelup(1)
		scharacter_xp = 0

func _son_class_level_up(value: int):
	._son_class_level_up(value)
	refresh_spells(value)

func _son_character_level_up(value: int) -> void:
	._son_character_level_up(value)
	refresh_spells(value)
		
func refresh_spells(value: int):
	if gets_free_spell_points() == 0 and gets_free_talent_points() == 0:
		return
	
	var ecd : EntityClassData = sentity_data.entity_class_data
	
	if ecd == null:
		return
	
	var arr : Array = Array()
	
	for i in range(ecd.get_num_spells()):
		arr.append(ecd.get_spell(i))
		
	randomize()
	arr.shuffle()
	
	for _v in range(value):
		for i in range(arr.size()):
			var spell : Spell = arr[i]
			
			if not hass_spell(spell):
				var spnum :int = gets_spell_count()
				
				crequest_spell_learn(spell.id)
				
				if spnum != gets_spell_count():
					break
				
			if sfree_spell_points == 0:
				break
			
			
		if sfree_spell_points == 0:
			break
	

func sset_position(position : Vector3, rotation : Vector3) -> void:
	if multiplayer.network_peer and multiplayer.is_network_server():
#		cset_position(position, rotation)
		vrpc("cset_position", position, rotation)
		
remote func cset_position(position : Vector3, rotation : Vector3) -> void:
	get_body().translation = position
	get_body().rotation = rotation