extends Node3D

var tile_grid_size = 64
var astar_grid_room = AStarGrid2D.new()

var load_tile = preload("res://tiles/base_tile/base_tile.tscn")
var load_room = preload("res://places/base_place/base_room.tscn")

var place_tile_dict = {}

var selection_drag_dict = {}
var selection_dict = {}

var room_dict = {}

var tile_count_x_hist = null
var tile_count_z_hist = null

var build_allowed = true

func _ready():
#Sets up a simple 2D grid of blank tiles.

	for x in range(tile_grid_size):
		for z in range (tile_grid_size):
			var pos = Vector3i(x, 0, z)
			
			var tile = load_tile.instantiate()
			tile.set_position(pos)
			
			tile.grid_pos = pos
			
			tile.update(0, 2)
			
			place_tile_dict[pos] = tile
			
			add_child(tile)

func draw_tile_click(click_pos):
#starts a selection drag
	
	var build_start_pos: Vector3i = click_pos.floor()
	tile_count_x_hist = 0
	tile_count_z_hist = 0
	
	if place_tile_dict.has(build_start_pos):
		select_tile(build_start_pos)

func init_select_drag(float_build_start_pos, float_build_mouse_pos):
#Creats an array of dragged tiles between mouse start and current position
	
	var select_drag_array = []
	
	var build_start_pos: Vector3i = float_build_start_pos.floor()
	var build_mouse_pos: Vector3i = float_build_mouse_pos.floor()

	var tile_count_x = build_mouse_pos.x - build_start_pos.x
	var tile_count_z = build_mouse_pos.z - build_start_pos.z
	
	if not tile_count_x_hist == tile_count_x or not tile_count_z_hist == tile_count_z:
		
		tile_count_x_hist = tile_count_x
		tile_count_z_hist = tile_count_z
		 
		for x in range(min(0, tile_count_x), max(0, tile_count_x) + 1):
			for z in range(min(0, tile_count_z), max(0, tile_count_z) + 1):
				var select_drag_pos = build_start_pos + Vector3i(x, 0, z)
				if place_tile_dict.has(select_drag_pos):
					if not place_tile_dict[select_drag_pos].construction_mode == 4:
						select_drag_array.append(select_drag_pos)
		
		if select_drag_array:
			draw_select_drag(select_drag_array)

func draw_select_drag(array):
#Clears previous drag, then calls tile selection on all currently dragged tiles

	for i in place_tile_dict:
		if not selection_dict.has(i):
			var tile_selected = place_tile_dict[i]
			tile_selected.update(1, 0)
				
	selection_drag_dict.clear()
	
	for i in array:
		select_tile(i)

func select_tile(pos):
#Tells tiles to be selected

	var tile = place_tile_dict[pos]
	
	selection_drag_dict[pos] = tile
	
	if build_allowed:
		tile.update(3, 0)
	else:
		tile.update(4, 0)

func verify_room():
#Verifies that a given selection is fully contiguous
	
	var verify_array = selection_dict.keys()
	var verify_queue_array = [verify_array[0]]
	var verify_checked_array = []

	while verify_array:
		if not verify_queue_array:

			return false

		var verify_pos = verify_queue_array.pop_back()
		
		var verify_neighbor_array = place_tile_dict[verify_pos].neighbor_array
		
		for n in verify_neighbor_array:
		
			if selection_dict.has(verify_pos + n):
				if not verify_checked_array.has(verify_pos + n):
					if not verify_queue_array.has(verify_pos + n):
						verify_queue_array.append(verify_pos + n)

		verify_checked_array.append(verify_pos)
		verify_array.erase(verify_pos)
	
	return true

func end_select_drag():
#Adds dragged tiles to the current selection on mouse-up

	tile_count_x_hist = 0
	tile_count_z_hist = 0

	selection_dict.merge(selection_drag_dict)
	
	for i in selection_dict.keys():
		var tile = selection_dict[i]
		for j in range(4):
			tile.update_face(j, 1)
		var neighbor = 0
		for j in tile.neighbor_array:
			if not selection_dict.has(i + j):
				tile.update_face(neighbor, 2)
			neighbor = neighbor + 1

	if verify_room():
		build_allowed = true
		for i in selection_dict:
			place_tile_dict[i].update(3, 0)
	else:
		build_allowed = false
		for i in selection_dict:
			place_tile_dict[i].update(4, 0)
	
	selection_drag_dict.clear()

func build_selection():
#When the build or destroy button is clicked, changes the selected tiles to match the button's request

	if not build_allowed:
		return
	
	for i in selection_dict:
		var tile_selected = place_tile_dict[i]
		tile_selected.update(1, 4)
		
	create_room()
	
	selection_dict.clear()

func clear_selection():
#When the clear button is clicked, it clears the selected tiles without doing anything.

	for i in selection_dict:
		var tile_selected = selection_dict[i]
		tile_selected.update(1, 0)
		build_allowed = true
	
	for i in selection_dict.keys():
		var tile = selection_dict[i]
		for j in range(4):
			tile.update_face(j, 1)
	
	selection_dict.clear()

func create_room():
	
	var room = load_room.instantiate()
	
	room.position = (selection_dict.keys().min())
	
	room.room_tile_dict = selection_dict.duplicate()
	
	room.name = str("Room", room.get_instance_id())
	
	add_child(room)
	
	for i in room.room_tile_dict:
		place_tile_dict[i].room_id = room