extends Node2D

enum TileType {
	None,
	Sand,
	Grass
}

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

var size = [40,60]
var tile_size = 64

var HexPoints = null
var HexColors = null

# Tiles order:
# 0,0   0,1   0,2 ...
#    1,0   1,1   1,2 ...
# 2,0   2,1   2,2
# ...
# ..           size[0],size[1]
var tile_data = []

# Called when the node enters the scene tree for the first time.
func _ready():
	clear()
	pass # Replace with function body.

func clear():
	create_hex_points (tile_size)
	HexGrid.hex_scale = Vector2(tile_size, tile_size) * 2
	for r in range (size[1]):
		for c in range (size[0]):
			tile_data.append(TileType.None)

func GetTile(r, c):
	if r < 0 or r >= size[1] or c < 0 or c >= size[0]:
		print ("Invalid tile coord: ", r, ", ", c)
		return

	return tile_data[c * size[1] + r]

func SetTile(r, c, tile_type):
	if r < 0 or r >= size[1] or c < 0 or c >= size[0]:
		print ("Invalid tile coord: ", r, ", ", c)
		return

	tile_data[c * size[1] + r] = tile_type
	update()

func WorldToTileCoords (pos):
	pos = pos
	return HexGrid.get_hex_at(Vector2(pos.x, -pos.y)).axial_coords

func GetHexCenter(hex):
	var center = HexGrid.get_hex_center(hex)
	return Vector2 (center.x, -center.y)

func create_hex_points (size):
	HexPoints = PoolVector2Array()
	
	var NoneColors = PoolColorArray()
	var SandColors = PoolColorArray()
	var GrassColors = PoolColorArray()
	
	for i in range (7):
		var angle = (60 * i) * PI / 180
		HexPoints.append(Vector2(cos(angle), sin(angle)) * size)
		NoneColors.append("#555555")
		SandColors.append("#ffa106")
		GrassColors.append("#4b9635")
		
	HexColors = { 
		TileType.None: NoneColors,
		TileType.Sand: SandColors,
		TileType.Grass: GrassColors
	}

func draw_grid():
	var pos_start = HexGrid.get_hex_center(Vector2(0,0))
	var w = 2 * tile_size
	var h = sqrt(3) * tile_size

	var initial_transform = get_canvas_transform()
		
	for ci in range (size[0]):
		draw_set_transform_matrix(initial_transform)

		for ri in range (size[1]):			
			var tile_type = GetTile(ri, ci)
			if tile_type == null:
				tile_type = TileType.None

			var color_array = HexColors[tile_type]
			
			var tile_center = GetHexCenter(Vector2(ri, ci))
			
			draw_set_transform(tile_center, 0, Vector2.ONE)
			draw_polygon(HexPoints, color_array)
			draw_polyline(HexPoints, "#888888")

func _draw():
	draw_grid()
	
# Called every frame. 'delta' is the elapsed time since the previous frame.
#func _process(delta):
#	pass