#!/usr/bin/env python

import os, sys, pygame

class Button:
    def __init__(self, size, topleft):
        self.up_image = pygame.image.load('button-up.png').convert_alpha()
        self.up_image = pygame.transform.smoothscale(self.up_image, (size, size))

        self.down_image = pygame.image.load('button-down.png').convert_alpha()
        self.down_image = pygame.transform.smoothscale(self.down_image, (size, size))

        self.rect = self.up_image.get_rect()
        self.rect.topleft = topleft

        self.pressed = False

    def draw_on(self, screen):
        if self.pressed:
            screen.blit(self.down_image, self.rect)
        else:
            screen.blit(self.up_image, self.rect)

    def is_pressed(self, pos):
        return self.rect.collidepoint(pos)

    def press(self):
        self.pressed = True
        self.run()

    def unpress(self):
        self.pressed = False

    def run(self):
        print('click')

class IncButton(Button):
    def run(self):
        Photoboite.i += 1

class DecButton(Button):
    def run(self):
        Photoboite.i -= 1

class Photoboite:
    i = 0

    def __init__(self):
        self.screen = self.screen()
        pygame.font.init()

        self.background = 255, 255, 255
        self.buttons = []

        button_size = int(self.screen.get_width() / 4)
        topleft = self.screen.get_width() - button_size - 20, self.screen.get_height() / 4 - button_size / 2

        self.buttons.append(IncButton(button_size, topleft))
        self.buttons.append(DecButton(50, (70, 400)))

        self.camera = pygame.Rect(20, 20, self.screen.get_width() - self.screen.get_width() / 4 - 60, self.screen.get_height() - 40)

        self.font = pygame.font.Font(None, 80)


    def screen(self):
        if os.getenv('DISPLAY'):
            pygame.display.init()
            return pygame.display.set_mode((1280, 768))
        else:
            drivers = ['directfb', 'fbcon', 'svgalib']
            found = False
            for driver in drivers:
                if not os.getenv('SDL_VIDEODRIVER'):
                    os.putenv('SDL_VIDEODRIVER', driver)
                try:
                    pygame.display.init()
                except pygame.error as e:
                    print('Driver: {0} failed.'.format(driver))
                    continue
                found = True
                break

            if not found:
               raise Exception('No suitable video driver found!')

            return pygame.display.set_mode()


    def run(self):
        pressed = False
        while True:
            for event in pygame.event.get():
                if event.type == pygame.QUIT or event.type == pygame.KEYDOWN and event.unicode == 'q':
                    sys.exit()
                elif event.type == pygame.MOUSEBUTTONDOWN:
                    for button in self.buttons:
                        if button.is_pressed(event.pos):
                            button.press()
                elif event.type == pygame.MOUSEBUTTONUP:
                    for button in self.buttons:
                        if button.is_pressed(event.pos):
                            button.unpress()

            self.screen.fill(self.background)

            self.screen.fill((0,0,0), rect=self.camera)

            text = str(Photoboite.i)
            size = self.font.size(text)
            ren = self.font.render(text, 0, (255, 255, 0))
            self.screen.blit(ren, (40, 40))


            for button in self.buttons:
                button.draw_on(self.screen)
            pygame.display.flip()

photoboite = Photoboite()
photoboite.run()