import os
import threading
from multiprocessing.pool import ThreadPool

from PyQt5.QtCore import pyqtSlot, QFileInfo, pyqtSignal, QBuffer, QByteArray, QIODevice, QSize, Qt
from PyQt5.QtGui import QMovie, QPixmap, QIcon
from PyQt5.QtWidgets import QWidget, QFileDialog, QLabel
from QCandyUi.CandyWindow import colorful

import ocr_util
from screen_capture import CaptureScreen
from ui_image2text import Ui_image2textWidget

# 全局截屏快捷键
SCREEN_SHOT_SHORTCUT = 'ctrl+shift+alt+f8'

# 资源路径
SCREEN_SHOT_ICON_URL = './asset/scissors.png'
OPEN_FILE_ICON_URL = './asset/file.png'
LOADING_GIF_URL = './asset/loading.gif'

# 设置
MIN_AFTER_SHOT = False


@colorful('blueGreen')
class Image2Text(QWidget):
    signal_response = pyqtSignal(str)

    def __init__(self):
        QWidget.__init__(self)
        self.ui = Ui_image2textWidget()
        self.ui.setupUi(self)
        self.ui.textEdit.setAcceptDrops(False)
        self.ui.textEdit.setPlaceholderText('1.将待识别图片拖拽到此处...\n' + '2.截屏识图快捷键: ' + SCREEN_SHOT_SHORTCUT)
        self.setAcceptDrops(True)
        self.init_loading_gif()
        self.signal_response.connect(self.__slot_http_response)
        self.beautify_button(self.ui.pushButtonOpen, OPEN_FILE_ICON_URL)
        self.beautify_button(self.ui.pushButtonCapture, SCREEN_SHOT_ICON_URL)

    def __init_threadPool(self):
        self.pool = ThreadPool(10)

    def beautify_button(self, button, image_url):
        """
        美化按键
        :param button:  QPushButton
        :param image_url: str
        :return: None
        """
        button.setText('')
        button.setIcon(QIcon(image_url))
        icon_width = button.height() >> 1
        button.setIconSize(QSize(icon_width, icon_width))
        button.setFlat(True)

    def init_loading_gif(self):
        """
        初始化loading动画
        :return:
        """
        gif = QMovie(LOADING_GIF_URL)
        gif.start()
        x, y = 275, 110
        self.loadingLabel = QLabel(self)
        self.loadingLabel.setMovie(gif)
        self.loadingLabel.adjustSize()
        self.loadingLabel.setGeometry(x, y, self.loadingLabel.width(), self.loadingLabel.height())
        self.loadingLabel.setVisible(False)

    def job_ocr(self, image_bytes):
        result = ''
        try:
            result = ocr_util.get_ocr_str_from_bytes(image_bytes)
        finally:
            self.signal_response.emit(result)

    def run_ocr_async(self, image_bytes):
        self.loadingLabel.setVisible(True)
        threading.Thread(target=self.job_ocr, args=(image_bytes,)).start()

    def pixmap_to_bytes(self, image, image_format='jpg'):
        """
        Pixmap转字节
        :param image: pixmap
        :param image_format: str
        :return: bytes
        """
        byte_array = QByteArray()
        buffer = QBuffer(byte_array)
        buffer.open(QIODevice.WriteOnly)
        image.save(buffer, image_format)
        return buffer.data()

    @pyqtSlot()
    def on_pushButtonOpen_clicked(self):
        file_urls = QFileDialog.getOpenFileNames()[0]
        if len(file_urls) > 0:
            self.ui.textEdit.clear()
        for img_full_path in file_urls:
            if img_full_path is None or img_full_path == '':
                continue
            with open(img_full_path, 'rb') as fp:
                file_bytes = fp.read()
            self.run_ocr_async(file_bytes)

    @pyqtSlot()
    def on_pushButtonCapture_clicked(self):
        self.capture = CaptureScreen()
        self.capture.signal_complete_capture.connect(self.__slot_screen_capture)

    @pyqtSlot(str)
    def __slot_http_response(self, result):
        self.ui.textEdit.append(result)
        self.loadingLabel.setVisible(False)

    @pyqtSlot(QPixmap)
    def __slot_screen_capture(self, image):
        image_bytes = self.pixmap_to_bytes(image)
        if image_bytes is None or len(image_bytes) == 0:
            return
        self.run_ocr_async(image_bytes)

    def dragEnterEvent(self, event):
        if (event.mimeData().hasUrls()):
            event.acceptProposedAction()

    def dragMoveEvent(self, event):
        if (event.mimeData().hasUrls()):
            event.acceptProposedAction()

    def dropEvent(self, event):
        if (event.mimeData().hasUrls()):
            urlList = event.mimeData().urls()
            realList = list()
            self.ui.textEdit.clear()
            for url in urlList:
                fileInfo = QFileInfo(url.toLocalFile())
                full_path = fileInfo.filePath()
                if os.path.isfile(full_path):
                    realList.append(full_path)
                if os.path.isdir(full_path):
                    realList.extend(self.__getFiles(full_path))
            for url in realList:
                with open(url, 'rb') as fp:
                    file_bytes = fp.read()
                self.run_ocr_async(file_bytes)
            event.acceptProposedAction()

    def __getFiles(self, dir_path, suffix=None):
        """
        获取dir_path目录及其子目录下所有.xxx文件的路径
        :param suffix: 后缀如".sql" ".java" ; 若不填则不进行文件过滤
        :return: str or list or tuple
        """
        if dir_path == '' or dir_path is None:
            return
        if os.path.isfile(dir_path):
            return
        urls = list()
        for maindir, subdir, filename_list in os.walk(dir_path):
            for file in filename_list:
                full_path = os.path.join(maindir, file)
                ext = os.path.splitext(full_path)[1]
                ok = False
                if suffix is None:
                    ok = True
                elif isinstance(suffix, str):
                    if suffix == ext:
                        ok = True
                elif isinstance(suffix, list) or isinstance(suffix, tuple):
                    if suffix is None or ext in suffix:
                        ok = True
                if ok:
                    urls.append(full_path)
        return urls

    def keyPressEvent(self, e):
        """
        ctrl+alt+shift+F8
        :param e:
        :return:
        """
        if (e.modifiers() == Qt.ControlModifier | Qt.AltModifier | Qt.ShiftModifier) \
                and (e.key() == Qt.Key_F8):
            if MIN_AFTER_SHOT:
                self.parentWidget().showMinimized()
            self.ui.pushButtonCapture.clicked.emit()