extends Node2D

onready var HexTile = get_node("HexTile")
onready var WorldCamera = get_node("Camera")
onready var OffsetValueLabel = get_node("UI/TopContainer/OffsetValue")
onready var ZoomValueLabel = get_node("UI/TopContainer/ZoomValue")
onready var HexCoordValueLabel = get_node("UI/TopContainer/HexCoordValue")
onready var PlayerChar = get_node("PlayerChar")

var HexGrid = preload("../thirdparty/gdhexgrid/HexGrid.gd").new()

var hex_size = 128
var hex_grid_bbox = [[0,0], [10,10]]

var hex_hover = Vector2.ZERO
var is_dragging = false
var drag_start = null
var target = Vector2()

# Called when the node enters the scene tree for the first time.
func _ready():
	HexGrid.hex_scale = Vector2(hex_size, hex_size)
	HexTile.hex_scale = Vector2(hex_size, hex_size) 
	
	# Set player starting position
	PlayerChar.position = HexGrid.get_hex_center(Vector2(0,0))

func _draw():
	for r in range(hex_grid_bbox[0][0], hex_grid_bbox[1][0]):
		for c in range(hex_grid_bbox[0][1], hex_grid_bbox[1][1]):
			var coords = HexGrid.get_hex_center(Vector2(r,c))
			draw_set_transform(coords, 0, Vector2.ONE)
			draw_polygon (HexTile.HexPoints, HexTile.HexColors[HexTile.TileType.None])
			draw_polyline(HexTile.HexPoints, "#888", 1 * WorldCamera.zoom.x)

	var coords = HexGrid.get_hex_center (hex_hover)
	draw_set_transform(coords, 0, Vector2.ONE)
	draw_polyline(HexTile.HexPoints, "#f00", 2 * WorldCamera.zoom.x)

func screen_to_world(pos: Vector2):
	pos = pos - OS.get_window_safe_area().size * 0.5
	return WorldCamera.offset + pos * WorldCamera.zoom

func screen_to_hex(pos: Vector2):
	return HexGrid.get_hex_at(screen_to_world(pos)).axial_coords
	
func world_to_screen(pos: Vector2):
	return pos * WorldCamera.zoom + WorldCamera.offset

func _unhandled_input(event):
	if event is InputEventMouseButton:
		# Move main character
		if event.pressed and event.button_index == BUTTON_LEFT:
			PlayerChar.target = HexGrid.get_hex_center(screen_to_hex(event.position))
		
		#  Move camera
		if event.pressed and event.button_index == 3:
			is_dragging = true
			drag_start = (WorldCamera.offset / WorldCamera.zoom.x + event.position)
		else:
			is_dragging = false
		
		# Zoom Camera
		if event.pressed and event.button_index == BUTTON_WHEEL_DOWN and event.pressed:
				WorldCamera.zoom = WorldCamera.zoom * 1.0 / 0.8
		elif event.button_index == BUTTON_WHEEL_UP and event.pressed:
				WorldCamera.zoom = WorldCamera.zoom * 0.8

	if 'position' in event:
		if is_dragging:
			WorldCamera.offset = (drag_start - event.position) * WorldCamera.zoom.x
		else:
			hex_hover = screen_to_hex(event.position)
			HexCoordValueLabel.text = str(hex_hover)
		update()
	
	OffsetValueLabel.text = str(WorldCamera.offset)
	ZoomValueLabel.text = str(WorldCamera.zoom)