extends Node2D

onready var EditIslandButton = get_node("UI/TopContainer/EditIslandButton")
onready var GridDrawer = get_node("GridDrawer")
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")
onready var FPSValueLabel = get_node("UI/TopContainer/FPSValue")

var Island = preload("Island.gd")

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()
var tile_data = {}
var islands = []

# Called when the node enters the scene tree for the first time.
func _ready():
	load_world("user://pirate_game_world.save")
	Globals.HexGrid.hex_scale = Vector2(hex_size, hex_size)
	
	# Set player starting position
	PlayerChar.position = Globals.HexGrid.get_hex_center(Vector2(0,0))
	GridDrawer.hex_scale = Vector2(hex_size, hex_size)

func _draw():
	draw_tiles()
	draw_grid()


func draw_grid():
	var view_grid_corners = calc_grid_view_rect()
	
	var tl_tile_coords = Globals.HexGrid.get_hex_center(view_grid_corners[0])
	var tr_tile_coords = Globals.HexGrid.get_hex_center(view_grid_corners[1])
	var bl_tile_coords = Globals.HexGrid.get_hex_center(view_grid_corners[2])
	var br_tile_coords = Globals.HexGrid.get_hex_center(view_grid_corners[3])
	
	var nc = ceil ((tr_tile_coords[0] - tl_tile_coords[0]) * 1.5 / hex_size)
	var nr = ceil ((bl_tile_coords[1] - tr_tile_coords[1]) / hex_size) + 2
	
	for c in range (nc):
		var dx = 0.75 * hex_size * c
		var dy = (c % 2) * sqrt(3) * 0.25 * hex_size #(c % 2) * sqrt(3) * hex_size * 0.75
		for r in range (nr):
			draw_set_transform(tl_tile_coords + Vector2(dx, r * hex_size * sqrt(3) * 0.5 + dy), 0, Vector2.ONE)
			draw_polyline(GridDrawer.HexPoints, "#888", 1 * WorldCamera.zoom.x)

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

func draw_tiles():
	for coord in tile_data.keys():
		draw_set_transform (coord, 0, Vector2.ONE)
		draw_polygon(GridDrawer.HexPoints, GridDrawer.get_tile_color(tile_data[coord]))		

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

func calc_grid_view_rect():
	var view_tl = Vector2(-hex_size,-hex_size)
	var view_br = OS.get_window_safe_area().size - view_tl

	var top_left = screen_to_hex (view_tl)
	var top_right = screen_to_hex (Vector2(view_br.x, view_tl.y))
	var bottom_left = screen_to_hex (Vector2(view_tl.x, view_br.y))
	var bottom_right = screen_to_hex (view_br)
	return [top_left, top_right, bottom_left, bottom_right]

func handle_game_event(event):
	if event is InputEventMouseButton:
		# Move main character
		if event.pressed and event.button_index == BUTTON_LEFT:
			PlayerChar.target = Globals.HexGrid.get_hex_center(screen_to_hex(event.position))
			return true
			
	return false
	
func _unhandled_input(event):
	if event is InputEventMouseButton:
		if handle_game_event(event):
			return
			
		#  Move camera
		if event.pressed and event.button_index == 2:
			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 and WorldCamera.zoom.y < 3.5:
				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:
		hex_hover = screen_to_hex(event.position)
		HexCoordValueLabel.text = str(hex_hover)

		if is_dragging:
			WorldCamera.offset = (drag_start - event.position) * WorldCamera.zoom.x
		
		update()
	
	OffsetValueLabel.text = str(WorldCamera.offset)
	ZoomValueLabel.text = str(WorldCamera.zoom)


func save_world(path: String):
	var world_save_data = File.new()
	world_save_data.open(path, File.WRITE)
	world_save_data.store_line (to_json(tile_data))
	world_save_data.close()


func load_world(path: String):
	var world_save_data = File.new()
	world_save_data.open(path, File.READ)
	var data = parse_json(world_save_data.get_line())
	world_save_data.close()

	var data_keys = data.keys()
	tile_data = {}
	var coord_regex = RegEx.new()
	coord_regex.compile("\\((?<tile_x>-?\\d+(.?\\d+)?), (?<tile_y>-?\\d+(.?\\d+)?)\\)")
	
	var reg_test_result = coord_regex.search("(0, 0)")
	assert(reg_test_result)

	reg_test_result = coord_regex.search("(123.124, 552.0)")
	assert(reg_test_result)

	for k in data_keys:
		var coords = Vector2.ZERO
		var regresult = coord_regex.search(k)
		if regresult:
			print(regresult.get_string("tile_x"), "  -   ", regresult.get_string("tile_y"))
			coords = Vector2(float(regresult.get_string("tile_x")), float(regresult.get_string("tile_y")))
			tile_data[coords] = data[k]
	
	update()