import os
import time
from datetime import datetime
from io import BytesIO

from PIL import Image
from retrying import retry

from module.device.connection import Connection
from module.logger import logger


class Screenshot(Connection):
    _screenshot_method = 0
    _screenshot_method_fixed = False
    _adb = False
    _last_save_time = {}
    image: Image.Image

    def _screenshot_uiautomator2(self):
        image = self.device.screenshot()
        return image.convert('RGB')

    def _load_screenshot(self, screenshot):
        if self._screenshot_method == 0:
            return Image.open(BytesIO(screenshot)).convert('RGB')
        elif self._screenshot_method == 1:
            return Image.open(BytesIO(screenshot.replace(b'\r\n', b'\n'))).convert('RGB')
        elif self._screenshot_method == 2:
            return Image.open(BytesIO(screenshot.replace(b'\r\r\n', b'\n'))).convert('RGB')

    def _process_screenshot(self, screenshot):
        if self._screenshot_method_fixed:
            return self._load_screenshot(screenshot)
        else:
            for _ in range(3):
                try:
                    screenshot = self._load_screenshot(screenshot)
                except OSError:
                    self._screenshot_method += 1
                else:
                    self._screenshot_method_fixed = True
                    break
            return screenshot

    def _screenshot_adb(self):
        screenshot = self.adb_shell(['screencap', '-p'], serial=self.serial)
        return self._process_screenshot(screenshot)

    # @retry()
    # @timer
    def screenshot(self):
        """
        Returns:
            PIL.Image.Image:
        """
        adb = self.config.USE_ADB_SCREENSHOT
        self._adb = adb

        if adb:
            self.image = self._screenshot_adb()
        else:
            self.image = self._screenshot_uiautomator2()

        self.image.load()
        if self.config.ENABLE_ERROR_LOG_AND_SCREENSHOT_SAVE:
            logger.screenshot_deque.append({'time': datetime.now(), 'image': self.image})
            return self.image

    def save_screenshot(self, genre='items'):
        """Save a screenshot. Use millisecond timestamp as file name.

        Args:
            genre (str, optional): Screenshot type.

        Returns:
            bool: True if save succeed.
        """
        now = time.time()
        if now - self._last_save_time.get(genre, 0) > self.config.SCREEN_SHOT_SAVE_INTERVAL:
            fmt = 'png' if self._adb else 'png'
            file = '%s.%s' % (int(now * 1000), fmt)

            folder = os.path.join(self.config.SCREEN_SHOT_SAVE_FOLDER, genre)
            if not os.path.exists(folder):
                os.mkdir(folder)

            file = os.path.join(folder, file)
            self.image.save(file)
            self._last_save_time[genre] = now
            return True
        else:
            self._last_save_time[genre] = now
            return False