import project_constants as const
import json
from pygame import transform


# Class of our agent, initialization of it
# movement functions (those defined by the 'go_' prefix are not meant to actually move our agent, they just return some
# values that are later used by another function called 'is_valid_move' (which is defined in Minefield));

class Agent:
    last_action = None
    new_action = None

    def __init__(self, json_path):
        with open(json_path) as json_data:
            data = json.load(json_data)
        self.row, self.column = data["agents_initial_state"]["position"].split(",")
        self.row, self.column = int(self.row), int(self.column)
        self.position = [self.row, self.column]
        self.on_screen_coordinates = const.get_tile_coordinates(tuple(self.position))
        # self.direction = const.Direction()
        self.direction = const.Direction(data["agents_initial_state"]["direction"])
        self.rotation_angle = -const.Direction(self.direction).value * 90
        self.going_forward = False
        self.rotating_left = False
        self.rotating_right = False

    def update_and_draw(self, window, delta_time, minefield):
        self.update(delta_time, minefield)
        self.draw(window)

    def draw(self, window):
        coord_x, coord_y = self.on_screen_coordinates[0], self.on_screen_coordinates[1]
        tl_dimension = const.V_TILE_SIZE / 2

        rotating_rect = transform.rotate(const.ASSET_SAPPER, self.rotation_angle).get_rect()
        rotating_rect.center = (coord_x + tl_dimension, coord_y + tl_dimension)

        window.blit(transform.rotate(const.ASSET_SAPPER, self.rotation_angle), rotating_rect)

    def update(self, delta_time, minefield):
        self.new_action = self.going_forward + self.rotating_left * 2 + self.rotating_right * 4

        # counting next agents terrain tile
        # heading either up or down
        if const.Direction(self.direction).value % 2 == 0 and self.going_forward:
            next_row = min(9, self.row + const.Direction(self.direction).value - 1)
            next_column = self.column

        # heading either left or right
        else:
            next_row = self.row
            next_column = min(9, self.column - const.Direction(self.direction).value + 2)

        value_modifier = minefield.matrix[next_row][next_column].cost.value

        if self.going_forward:
            direction = const.Direction(self.direction).value
            x, y = self.on_screen_coordinates

            # heading either up or down
            if direction % 2 == 0:
                self.on_screen_coordinates = (x, y + (direction - 1) * const.V_TILE_SIZE * delta_time / value_modifier)

            # heading either left or right
            else:
                self.on_screen_coordinates = (x - (direction - 2) * const.V_TILE_SIZE * delta_time / value_modifier, y)

        elif self.rotating_right:
            self.rotation_angle -= delta_time * 90 % 360

        elif self.rotating_left:
            self.rotation_angle += delta_time * 90 % 360

        if self.last_action != self.new_action or \
                not any((self.going_forward, self.rotating_right, self.rotating_left)):
            self.last_action = self.new_action
            self.rotation_angle = -const.Direction(self.direction).value * 90
            self.on_screen_coordinates = const.get_tile_coordinates(tuple(self.position))

    def animate(self, action):
        self.reset_actions()
        if action == const.Action.ROTATE_LEFT:
            self.rotating_left = True
        elif action == const.Action.ROTATE_RIGHT:
            self.rotating_right = True
        elif action == const.Action.GO:
            self.going_forward = True

    def take_action(self, action):
        if action == const.Action.ROTATE_LEFT:
            self.rotate_left()
        elif action == const.Action.ROTATE_RIGHT:
            self.rotate_right()
        elif action == const.Action.GO:
            self.go()

    def rotate_left(self):
        self.direction = self.direction.previous()

    def rotate_right(self):
        self.direction = self.direction.next()

    def go(self):
        if self.direction == const.Direction.RIGHT:
            temp = self.go_right()
            self.position[1] = temp[1]
            self.column += 1
        elif self.direction == const.Direction.LEFT:
            temp = self.go_left()
            self.position[1] = temp[1]
            self.column -= 1
        elif self.direction == const.Direction.UP:
            temp = self.go_up()
            self.position[0] = temp[0]
            self.row -= 1
        elif self.direction == const.Direction.DOWN:
            temp = self.go_down()
            self.position[0] = temp[0]
            self.row += 1

    def go_right(self):

        return self.position[0], self.position[1] + 1

    def go_left(self):

        return self.position[0], self.position[1] - 1

    def go_up(self):

        return self.position[0] - 1, self.position[1]

    def go_down(self):

        return self.position[0] + 1, self.position[1]

    def reset_actions(self):
        self.going_forward = self.rotating_right = self.rotating_left = False