extends Resource
#warning-ignore-all:unused_class_variable

const DIR_N = Vector3(0, 0, -1)
const DIR_NE = Vector3(1, 0, -1)
const DIR_E = Vector3(1, 0, 0)
const DIR_SE = Vector3(1, 0, 1)
const DIR_S = Vector3(0, 0, 1)
const DIR_SW = Vector3(-1, 0, 1)
const DIR_W = Vector3(-1, 0, 0)
const DIR_NW = Vector3(-1, 0, -1)
const DIR_ALL = [DIR_N, DIR_NE, DIR_E, DIR_SE, DIR_S, DIR_SW, DIR_W, DIR_NW]

var size = Vector3( 1, 1, 1 )
var coords = Vector3( 0, 0, 0 )

func _init( p_coords ):
    if typeof(p_coords) == typeof(self):
        p_coords = p_coords.coords
        
    self.set_coords( p_coords )

func new_cell( p_coords ):
    # Returns a new HexCell instance
    return get_script().new( p_coords )
    
func set_coords( p_coords ):
    self.coords = Vector3( int(p_coords.x), int(p_coords.y), int(p_coords.z) )
#    self.coords = Vector3( floor(p_coords.x), floor(p_coords.y), floor(p_coords.z) )
    
func distance_to( p_coords ):
    var a = p_coords.x - self.coords.x 
    var b = p_coords.y - self.coords.y 
    var c = p_coords.z - self.coords.z 
    var h = sqrt( a*a + b*b + c*c )
    return int( h )
    
func cell_distance_to( p_coords ):
    return max( abs(p_coords.x-self.coords.x), abs(p_coords.z-self.coords.z) )
    
    
func get_arc_area( p_distance, p_direction ):
    var cells = Array()
    
    if p_direction in [ DIR_N, DIR_S, DIR_E, DIR_W ]:
        var old_x = 0
        for x in range(1, p_distance):
            var nb_z = old_x + x
            for z in range( -ceil(nb_z/2)-1, floor(nb_z/2) ):
                var cell = null
                if p_direction == DIR_E:
                    cell = new_cell( self.coords+Vector3( x, 0, z+1 ) )
                elif p_direction == DIR_W:
                    cell = new_cell( self.coords+Vector3( -x, 0, z+1 ) )
                elif p_direction == DIR_N:
                    cell = new_cell( self.coords+Vector3( z+1, 0, -x ) )
                elif p_direction == DIR_S:
                    cell = new_cell( self.coords+Vector3( z+1, 0, x ) )

                if cell:
                    cells.push_back( cell ) 
            old_x = x
    else:
        var old_x = 0
        for x in range(1, p_distance+1):
            for z in range( 0, p_distance ):
                var cell = null
                if p_direction == DIR_SW:
                    cell = new_cell( self.coords+Vector3( -x, 0, z+1 ) )
                elif p_direction == DIR_NW:
                    cell = new_cell( self.coords+Vector3( -x, 0, -(z+1) ) )
                elif p_direction == DIR_NE:
                    cell = new_cell( self.coords+Vector3( z+1, 0, -x ) )
                elif p_direction == DIR_SE:
                    cell = new_cell( self.coords+Vector3( z+1, 0, x ) )

                if cell:
                    cells.push_back( cell )   
    return cells
    
    
func get_ring( distance ):
    var cells = Array()
    for x in range( -distance+self.coords.x, distance+self.coords.x+1 ):
        for z in range( -distance+self.coords.z, distance+self.coords.z+1 ):
            var cell = new_cell( Vector3( x, 0, z ) )
            if not cell.coords == self.coords and self.cell_distance_to( cell.coords ) == distance:
                cells.push_back( cell )
    return cells
    
func get_area( distance_max, distance_min = 0 ):
    var cells = Array()
    for x in range( -distance_max+self.coords.x, distance_max+self.coords.x+1 ):
        for z in range( -distance_max+self.coords.z, distance_max+self.coords.z+1 ):
            var cell = new_cell( Vector3( x, 0, z ) )
            if not cell.coords == self.coords:
                if self.cell_distance_to( cell.coords ) >= distance_min:
                    cells.push_back( cell )
    return cells

func get_adjacent( direction ):
    return self.new_cell(self.coords + direction)

func get_cells_adjacent():    
    var cells = Array()
    for coord in DIR_ALL:
        cells.append(new_cell(self.coords + coord))
    return cells

static func get_dir_from_angle( p_angle ):
    p_angle = int(p_angle) % 360
    if p_angle < 0:
        p_angle = 360 + p_angle
    if (0 <= p_angle and p_angle < 22.5) or (337.5 <= p_angle and p_angle <= 360):
        return DIR_N
    elif 22.5 <= p_angle and p_angle < 67.5:
        return DIR_NW
    elif 67.5 <= p_angle and p_angle < 112.5:
        return DIR_W
    elif 112.5 <= p_angle and p_angle < 157.5:
        return DIR_SW
    elif 157.5 <= p_angle and p_angle < 202.5:
        return DIR_S
    elif 202.5 <= p_angle and p_angle < 247.5:
        return DIR_SE
    elif 247.5 <= p_angle and p_angle < 337.5:
        return DIR_E
    elif 292.5 <= p_angle and p_angle < 337.5:
        return DIR_NE
    return null
    


static func dir_to_str( p_dir ):
    if p_dir == DIR_N:
        return "N"
    elif p_dir == DIR_NE:
        return "NE"
    elif p_dir == DIR_E:
        return "E"
    elif p_dir == DIR_SE:
        return "SE"
    elif p_dir == DIR_S:
        return "S"
    elif p_dir == DIR_SW:
        return "SW"
    elif p_dir == DIR_W:
        return "W"
    elif p_dir == DIR_NW:
        return "NW"
    else:
        return "None"