extends BlockAction

class_name BlockActionAttackDistance


var attack_distance:int=0
func _init() -> void:
	self.action_name="远程攻击"
	self.need_target=true
	
	pass
#获取动作可以作用于的地块(true or false)二维数组,并建立寻路缓存
func get_action_could_use_block(_self:UnitBlock,tile_map_area:Rect2i,global_block_data:Dictionary)->Array:
	var astar=AStarGrid2D.new()
	print(global_block_data)
	astar.default_compute_heuristic=AStarGrid2D.HEURISTIC_MANHATTAN
	astar.default_estimate_heuristic=AStarGrid2D.HEURISTIC_MANHATTAN
	astar.diagonal_mode=AStarGrid2D.DIAGONAL_MODE_NEVER
	astar.region=Rect2i(tile_map_area.position,tile_map_area.size+Vector2i(1,1))
	astar.update()
	var right_pos:Vector2i=tile_map_area.position+tile_map_area.size
	for i in range(tile_map_area.position.x,right_pos.x+1):
		var res_in:Array[bool]=[]
		for j in range(tile_map_area.position.y,right_pos.y+1):
			if global_block_data.has(Vector2i(i,j)):
				#计算当前地块是否可通行
				var block_arr:Array=global_block_data[Vector2i(i,j)]
				var walkable:bool=true
				for k in block_arr:
					if k is BaseBlock:
						walkable=walkable and k.walkable
				astar.set_point_solid(Vector2i(i,j),not walkable)
			else:
				#默认可通行
				astar.set_point_solid(Vector2i(i,j),false)
	var res:Array=[]
	block_road_cache=[]
	for i in range(tile_map_area.position.x,right_pos.x+1):
		var res_in:Array[bool]=[]
		var block_in:Array=[]
		for j in range(tile_map_area.position.y,right_pos.y+1):
			var road_find_result=is_move_able(astar,_self.block_pos,Vector2i(i,j),_self.action_num,tile_map_area)
			block_in.append(road_find_result)
			res_in.append(road_find_result[0])
		res.append(res_in)
		block_road_cache.append(block_in)
		pass
	return res


#区域是否可达
func is_move_able(astar:AStarGrid2D,from:Vector2i,to:Vector2i,move_distance:int,tile_map_area:Rect2i):
	var res=get_walkable_path(astar,from,to,tile_map_area)
	if not res[0]:
		return [false,0,null]
	var distance=res[1]
	if move_distance>=distance:
		return [true,res[1],res[2]]
	else:
		return [false,0,null]




#获取两点之间的最短可达路径，返回一个数组，0下标未是否可达，1下标为距离，2下标为途径点数组
func get_walkable_path(astar:AStarGrid2D,from:Vector2i,to:Vector2i,tile_map_area:Rect2i)->Array:
	var right_pos=tile_map_area.position+tile_map_area.size
	#如果不在要求的tilemap范围内，则返回不可达
	if to.x<tile_map_area.position.x or to.x>right_pos.x or to.y<tile_map_area.position.y or to.y>right_pos.y:
		return [false,0,null]
	var arr=astar.get_id_path(from,to)
	if arr==null or (arr is Array and arr.size()<=0):
		return [false,0,null]
	return [true,arr.size()-1,arr]
#寻路缓存
var block_road_cache:Array=[]
#在_self上使用action动作,返回是否成功
func block_use_action(_self:UnitBlock,tile_map_area:Rect2i,global_block_data:Dictionary,target=null)->bool:
	if not target is Vector2i:
		return false
	
	var astar=AStarGrid2D.new()
	astar.default_compute_heuristic=AStarGrid2D.HEURISTIC_MANHATTAN
	astar.default_estimate_heuristic=AStarGrid2D.HEURISTIC_MANHATTAN
	astar.diagonal_mode=AStarGrid2D.DIAGONAL_MODE_NEVER
	astar.region=Rect2i(tile_map_area.position,tile_map_area.size+Vector2i(1,1))
	astar.update()
	var right_pos:Vector2i=tile_map_area.position+tile_map_area.size
	for i in range(tile_map_area.position.x,right_pos.x+1):
		var res_in:Array[bool]=[]
		for j in range(tile_map_area.position.y,right_pos.y+1):
			if global_block_data.has(Vector2i(i,j)):
				#计算当前地块是否可通行
				var block_arr:Array=global_block_data[Vector2i(i,j)]
				var walkable:bool=true
				for k in block_arr:
					if k is BaseBlock:
						walkable=walkable and k.walkable
				astar.set_point_solid(Vector2i(i,j),not walkable)
			else:
				#默认可通行
				astar.set_point_solid(Vector2i(i,j),false)
	var res=is_move_able(astar,_self.block_pos,target,_self.action_num,tile_map_area)
	if res[0]:
		_self.action_num-=res[1]
		_self.request_move(res[2],global_block_data)
		return true
	return false
var draw_line
#展示施法演示
func draw_action_with_target(_self:UnitBlock,tile_map_area:Rect2i,global_block_data:Dictionary,target:Vector2i,block_add_pos:TileMapLayer):
	var right_pos=tile_map_area.position+tile_map_area.size
	if target.x<tile_map_area.position.x or target.x>right_pos.x or target.y<tile_map_area.position.y or target.y>right_pos.y:
		if draw_line!=null:
			draw_line.queue_free()
			draw_line=null
		return
	var crood=target-tile_map_area.position
	var cache=block_road_cache[crood.x][crood.y]
	if not cache[0]:
		if draw_line!=null:
			draw_line.queue_free()
			draw_line=null
		return
	var point_arr:Array=cache[2]
	if draw_line!=null:
		draw_line.queue_free()
		draw_line=null
	var new_line=Line2D.new()
	block_add_pos.add_child(new_line)
	draw_line=new_line
	draw_line.default_color=Color.RED
	for i in point_arr:
		draw_line.add_point(block_add_pos.map_to_local(i))
		
	
	pass
#释放施法演示
func del_action_with_target():
	block_road_cache.clear()
	if draw_line!=null:
		draw_line.queue_free()
		draw_line=null
	pass