from area.constants import TILE_SIZE
import copy
from area.tractor import Tractor

class Istate:

    def __init__(self, x, y, direction ):
        self.x = x
        self.y = y
        self.direction = direction


    def get_x(self):
        return self.x

    def set_x(self, _x):
        self.x = _x

    def get_y(self):
        return self.y

    def set_y(self, _y):
        self.y = _y   
    
    def get_direction(self):
        return self.direction
    
    def set_direction(self, _direction):
        self.parent = _direction

class Node:

    def __init__(self, x, y, direction, parent, action):
        self.x = x
        self.y = y
        self.direction = direction
        self.action = action
        self.parent = parent



        #getters and setters:

    def get_parent(self):
        return self.parent
    
    def set_parent(self, _parent):
        self.parent = _parent
        
    def get_action(self):
        return self.action
    
    def set_action(self, _action):
        self.parent = _action

    def get_x(self):
        return self.x

    def set_x(self, _x):
        self.x = _x

    def get_y(self):
        return self.y

    def set_y(self, _y):
        self.y = _y   
    
    def get_direction(self):
        return self.direction
    
    def set_direction(self, _direction):
        self.parent = _direction

    def copy(self):
        return copy.copy(self)
    

def goal_test(elem, goalstate):
    if elem.get_x() == goalstate[0] and elem.get_y() == goalstate[1]:
        return True
    else:
        return False


#State as a tuple (x,y,direction)
    
#actions(string): move, rotate_to_left, rotate_to_right

#main search function:
def graphsearch(istate, succ, goaltest, tractor):

    fringe = []
    explored = []
    node = Node(istate.get_x(), istate.get_y(), istate.get_direction(), None, None)
    fringe.append(node)

    while True:

        if not fringe:
            return False
        
        elem = fringe.pop(0)
        temp = copy.copy(elem)
        if goal_test(elem, goaltest) is True:   #jesli True zwroc ciag akcji
            return get_moves(elem)
            
        explored.append(elem)

        for (action, state) in succ(temp, tractor): #dla wszystkich mozliwych stanow i akcjach otrzymanych dla danego wierzcholka
            fringe_tuple = []
            explored_tuple = []

            for node in fringe:
                 fringe_tuple.append((node.get_x(), node.get_y(), node.get_direction()))
            for node in explored:
                 explored_tuple.append((node.get_x(), node.get_y(), node.get_direction()))

            
            if state not in fringe_tuple and state not in explored_tuple:
                x = Node(state[0], state[1], state[2], elem, action)
                fringe.append(x)


#funkcja nastepnika - jakie akcje sa mozlwie na danym polu i jaki bedzie stan po wykonaniu tych akcji
def succ(elem, tractor):
    actions_states = []
    temp = copy.copy(elem.get_direction())
    
    if temp == 1:
        temp = 4
    else:
        temp -= 1
    actions_states.append(("rotate_left", (elem.get_x(), elem.get_y(), temp)))

    temp = copy.copy(elem.get_direction())   
    if temp == 4:
        temp = 1
    else:
        temp += 1
    actions_states.append(("rotate_right", (elem.get_x(), elem.get_y(), temp)))
   
    temp_move_east = elem.get_x() + TILE_SIZE
    temp_move_west = elem.get_x() - TILE_SIZE
    temp_move_north = elem.get_y() - TILE_SIZE
    temp_move_south = elem.get_y() + TILE_SIZE

    if Tractor.can_it_move_node(elem) == "move east" and not Tractor.is_obstacle(tractor, temp_move_east, elem.get_y()):
         actions_states.append(("move", (temp_move_east, elem.get_y(), elem.get_direction())))

    elif Tractor.can_it_move_node(elem) == "move west" and not Tractor.is_obstacle(tractor, temp_move_west, elem.get_y()):
         actions_states.append(("move", (temp_move_west, elem.get_y(), elem.get_direction())))

    elif Tractor.can_it_move_node(elem) == "move north" and not Tractor.is_obstacle(tractor,elem.get_x(), temp_move_north):
         actions_states.append(("move", (elem.get_x(), temp_move_north, elem.get_direction())))

    elif Tractor.can_it_move_node(elem) == "move south" and not Tractor.is_obstacle(tractor, elem.get_x(), temp_move_south):
         actions_states.append(("move", (elem.get_x(), temp_move_south, elem.get_direction())))

    return actions_states
 


#returns list of actions      
def get_moves(elem):
    move_list = []
    while (elem.get_parent() != None):
          move_list.append(elem.get_action())
          elem = elem.get_parent()
    move_list.reverse()
    return move_list