extends Spatial

onready var hexgrid = preload("res://addons/gdhexgrid/HexGrid.gd").new()
onready var hex_tile_3d = preload("res://scenes/HexTile3D.tscn")

onready var player = $Player
onready var player_move_component = $Player/Movable

# GUI
onready var tile_label = $Control/HBoxContainer/tile_label
onready var tile_offset_label = $Control/HBoxContainer/tile_offset_label
onready var num_tiles_label = $Control/HBoxContainer/num_tiles_label
onready var num_active_tiles_label = $Control/HBoxContainer/num_active_tiles_label
onready var world_map_texture = $Control/HBoxContainer/WorldMapRect

onready var tile_highlight = $TileHighlight
onready var stream_container = $StreamContainer
onready var stream_active_tiles = $StreamContainer/ActiveTiles
onready var world = $World

# Streaming variables
var last_tile = HexCell.new()
var current_tile = HexCell.new()
var current_tile_offset = Vector2(0,0)

var top_left_cell = HexCell.new()
var bottom_right_cell = HexCell.new()
var stream_world_rect = Rect2()


func _ready():
	update_streaming_tiles()


func update_streaming_tiles():
	var stream_rect_position = hexgrid.get_hex_center3(current_tile)
	stream_world_rect = Rect2(
		stream_rect_position.x - stream_container.world_rect.size.x / 2, stream_rect_position.z - stream_container.world_rect.size.y / 2,
		stream_container.world_rect.size.x, stream_container.world_rect.size.y
		)

	stream_container.world_rect = stream_world_rect
	
	top_left_cell = hexgrid.get_hex_at(stream_world_rect.position)
	bottom_right_cell = hexgrid.get_hex_at(stream_world_rect.end)		
	
#	print ("update_streaming_tiles: cells: ", top_left_cell.offset_coords, " to ", bottom_right_cell.offset_coords)
	
	world.heightmap.lock()

	for cell_x in range (top_left_cell.offset_coords.x, bottom_right_cell.offset_coords.x + 1):
		for cell_y in range  (bottom_right_cell.offset_coords.y, top_left_cell.offset_coords.y + 1):
			if cell_x < 0 || cell_x >= world.size || cell_y < 0 || cell_y >= world.size:
				continue

			var tile_3d = stream_container.create_hextile3d_at(Vector2(cell_x, cell_y))
			var hex_center = hexgrid.get_hex_center_from_offset(Vector2(cell_x, cell_y))
			var height = world.get_height(Vector2(cell_x, cell_y))
			tile_3d.transform.origin = Vector3(hex_center.x, height, hex_center.y)
	
	world.heightmap.unlock()
	
	num_tiles_label.text = str(len(stream_container.tiles_by_offset_coord.values()))
	num_active_tiles_label.text = str(stream_active_tiles.get_child_count())


func _process(_delta):
	last_tile = current_tile

	var player_coord = player.transform.origin
	current_tile = hexgrid.get_hex_at(Vector2(player_coord.x, player_coord.z))
	
	world.heightmap.lock()
	player.transform.origin.y = world.get_height(current_tile.offset_coords)
	player.transform.origin.y = 2.0
	world.heightmap.unlock()
	
	var player_hex_offset_coord = current_tile.offset_coords
	tile_label.text = "%d, %d" % [player_hex_offset_coord.x, player_hex_offset_coord.y]

	current_tile_offset = Vector2(player_coord.x, player_coord.z) - hexgrid.get_hex_center_from_offset(current_tile.offset_coords)	
	tile_offset_label.text = "%2.2f, %2.2f" % [current_tile_offset.x, current_tile_offset.y]
	tile_highlight.transform.origin = Vector3(hexgrid.get_hex_center3(current_tile))
	
	if current_tile.offset_coords != last_tile.offset_coords:
		update_streaming_tiles()


func _input(event):
	var velocity = Vector3(0, 0, 0)
	
	if event is InputEventKey:
		if Input.is_action_pressed("Forward"):
			velocity.z = -5
		elif Input.is_action_pressed("Back"):
			velocity.z = 5
		else:
			velocity.z = 0
			
		if Input.is_action_pressed("Left"):
			velocity.x = -5
		elif Input.is_action_pressed("Right"):
			velocity.x = 5
		else:
			velocity.x = 0
	
		player_move_component.vel = velocity
	
		get_tree().set_input_as_handled()


func _on_World_world_generated():
	if world == null || world.heightmap == null:
		return
		
	var world_texture = ImageTexture.new()
	world_texture.create_from_image(world.heightmap)
	
	world_map_texture.texture = world_texture
	
	update_streaming_tiles()


func _on_GenerateWorldButton_pressed():
	world.init_noisemap()