import pygame

from pygame.locals import (
    K_UP,
    K_DOWN,
    K_LEFT,
    K_RIGHT,
    K_ESCAPE,
    K_SPACE,
    K_c,
    KEYDOWN,
    QUIT
)

from dimensions import *
from colors import *

class Tractor(pygame.sprite.Sprite):
    def __init__(self, field):
        super(Tractor, self).__init__()
        self.surf = pygame.Surface((WIDTH, HEIGHT))
        self.surf.fill(RED)
        self.position = field.position
        self.rect = self.surf.get_rect(
            topleft=((MARGIN + WIDTH) * self.position[0] + MARGIN, (MARGIN + HEIGHT) * self.position[1] + MARGIN))
        self.field = field
        
    def update(self, pressed_keys):
        if pressed_keys[K_UP]:
            self.rect.move_ip(0, -(HEIGHT + MARGIN))
            self.position[1] -= 1
            if self.rect.top <= MARGIN:
                self.rect.top = MARGIN
                self.position[1] = 0
        if pressed_keys[K_DOWN]:
            self.rect.move_ip(0, HEIGHT + MARGIN)
            self.position[1] += 1
            if self.rect.bottom >= SCREEN_HEIGHT-MARGIN:
                self.rect.bottom = SCREEN_HEIGHT-MARGIN
                self.position[1] = GSIZE-1
        if pressed_keys[K_LEFT]:
            self.rect.move_ip(-(WIDTH + MARGIN), 0)
            self.position[0] -= 1
            if self.rect.left < MARGIN:
                self.rect.left = MARGIN
                self.position[0] = 0
        if pressed_keys[K_RIGHT]:
            self.rect.move_ip(WIDTH + MARGIN, 0)
            self.position[0] += 1
            if self.rect.right > SCREEN_WIDTH-MARGIN:
                self.rect.right = SCREEN_WIDTH-MARGIN
                self.position[0] = GSIZE-1

    def hydrate(self, field, pressed_keys):
        if pressed_keys[K_SPACE]:
            field[self.position[0]][self.position[1]].hydrate()

    def cut(self, field, pressed_keys):
        if pressed_keys[K_c]:
            field[self.position[0]][self.position[1]].free()