extends Spatial

var GameTile = load("res://utils/GameTile.gd")
var HexCell = preload("res://addons/gdhexgrid/HexCell.gd")
onready var HexGrid = preload("res://addons/gdhexgrid/HexGrid.gd").new()
var IslandGenerator = preload("res://utils/IslandGenerator.gd").new()
onready var highlight = $Highlight

onready var tiles = $Tiles
var has_tiles_initialized = false
var tile_map = {}
var active_tile = null
var island_count = 5

export var size = Vector2(20, 20)
export var generate_flag: bool = false setget do_generate

func _ready():
	assert(get_node("Tiles") != null)
	generate()
	pass


func _process(_delta):
	pass


func add_tile_for_hex(game_tile):
	var hexgrid = preload("res://addons/gdhexgrid/HexGrid.gd").new()
	var HexTile3D = preload("res://scenes/HexTile3D.tscn")
	
	var tile = HexTile3D.instance()
	var pos = hexgrid.get_hex_center_from_offset(game_tile.offset_coords)	
	var height = -2.0 # if game_tile.type == GameTile.TileType.Sand else 0.1 + rand_range(0.0, 0.05)

	tiles.add_child(tile)
	tile_map[game_tile.offset_coords] = tile

	tile.set_tiletype(game_tile.type)
	tile.transform.origin = Vector3(pos.x, height, pos.y)
	tile.game_tile = game_tile
	
	return tile


func reset():
	var tiles = get_node("Tiles")
	print ("clearing old tiles: " + str(tiles.get_child_count()))
	for tile in tiles.get_children():
		tiles.remove_child(tile)
		tile.queue_free()
	tile_map = {}


func generate():
	reset()
	generate_base_tiles()
	
	for i in range (island_count):
		generate_island(Vector2(
			rand_range(-size.x / 2, size.x / 2),
			rand_range(-size.y / 2, size.y / 2)
			))
	
	mark_sand_tiles()
	smooth_water_tiles()
	smooth_water_tiles()
	smooth_water_tiles()
	smooth_water_tiles()	


func generate_base_tiles():
	print ("generating world")
	
	for i in range (-size.x / 2, size.x / 2):
		for j in range (-size.y / 2, size.y / 2):
			var tile = GameTile.new()
			tile.type = GameTile.TileType.Water
			tile.offset_coords = Vector2(i,j)
			
			add_tile_for_hex(tile)


func generate_island(start_pos: Vector2):	
	var generated_tiles = IslandGenerator.random_walk(20, start_pos)
	generated_tiles = IslandGenerator.extrude_tiles(generated_tiles)
#	generated_tiles = IslandGenerator.mark_sand_tiles(generated_tiles)
	
	for island_tile in generated_tiles.values():
		if not island_tile.offset_coords in tile_map.keys():
			continue
		var world_tile = tile_map[island_tile.offset_coords]
		world_tile.transform.origin[1] = 0
		world_tile.set_tiletype(island_tile.type)

	print ("Generated island with " + str(tiles.get_child_count()) + " nodes")



func mark_sand_tiles():
	for tile in tile_map.values():
		if tile.game_tile.type == GameTile.TileType.Water:
			continue
			
		tile.set_tiletype(GameTile.TileType.Grass if randi() % 2 else GameTile.TileType.DeepGrass)
		var tile_neighbours = tile.game_tile.get_all_adjacent()
		
		for neighbour in tile_neighbours:
			var tile_on_map = neighbour.offset_coords in tile_map.keys()
			if not tile_on_map:
				continue
				
			var neighbour_tile = tile_map[neighbour.offset_coords]
			if neighbour_tile.game_tile.type == GameTile.TileType.Water:
				tile.set_tiletype(GameTile.TileType.Sand)


func smooth_water_tiles():
	# horizontal smoothing
	for i in range ((-size.x / 2) + 1, (size.x / 2) - 1):
		for j in range ((-size.y / 2) + 1, (size.y / 2) - 1):
			var prev = tile_map[Vector2(i - 1,j)]
			var current = tile_map[Vector2(i,j)]
			var next = tile_map[Vector2(i + 1,j)]
			
			if current.game_tile.type != GameTile.TileType.Water:
				continue
			
			current.transform.origin[1] = min(-0.2, (prev.transform.origin[1] + next.transform.origin[1]) * 0.5)
	
	# vertical smoothings
	for i in range ((-size.x / 2) + 1, (size.x / 2) - 1):
		for j in range ((-size.y / 2) + 1, (size.y / 2) - 1):
			var prev = tile_map[Vector2(i,j - 1)]
			var current = tile_map[Vector2(i,j)]
			var next = tile_map[Vector2(i,j + 1)]
			
			if current.game_tile.type != GameTile.TileType.Water:
				continue
				
			current.transform.origin[1] = min(-0.2, (prev.transform.origin[1] + next.transform.origin[1]) * 0.5)				


func do_generate(flag: bool):
	print ("Generating Level")
	generate_flag = false
	# generate()


func _on_ClckArea_input_event(_camera, _event, position, _normal, _shape_idx):
	var hex_at_position = HexGrid.get_hex_at(position)
	var offset_coords = hex_at_position.offset_coords
	var hex_center = HexGrid.get_hex_center_from_offset(offset_coords)
	highlight.transform.origin = Vector3 (hex_center.x, 0.0, hex_center.y)
	
	var world_tile = null
	if offset_coords in tile_map.keys():
		world_tile = tile_map[offset_coords]
	
	if active_tile != null and world_tile != active_tile:
		pass

	if active_tile == world_tile:
		return

	if world_tile == null:
		return

	active_tile = world_tile


func _on_ClckArea_mouse_entered():
	highlight.visible = true


func _on_ClckArea_mouse_exited():
	highlight.visible = false