import sys 
from PyQt5 import QtWidgets, QtCore, QtGui 
import logging 
from logging import handlers
import traceback


class QPlainTextEditLogger(logging.Handler): 
    def __init__(self, parent): 
        super().__init__() 
        self.widget = QtWidgets.QPlainTextEdit(parent) 
        self.widget.setReadOnly(True)  

    def emit(self, record): 
        msg = self.format(record) 
        self.widget.appendPlainText(msg)  


class LogWindow(QtWidgets.QDialog): 
    def __init__(self, parent): 
        super().__init__()
        if parent.__class__.__name__ == 'VariableSettingsUi':
            return
        logging.basicConfig(level=logging.DEBUG,#控制台打印的日志级别
                    format= '%(asctime)s - %(pathname)s[line:%(lineno)d] - %(levelname)s: %(message)s'
                    )
        log_fmt = '%(asctime)s\tFile \"%(filename)s\",line %(lineno)s\t%(levelname)s: %(message)s'
        formatter = logging.Formatter(log_fmt)
        fh = handlers.TimedRotatingFileHandler(filename=f'{parent.projectPath}\\log\\DcsLog.log',when="D",interval=1,backupCount=15)
        fh.suffix = "%Y-%m-%d_%H-%M.log"
        fh.setFormatter(formatter)
        logTextBox = QPlainTextEditLogger(self) 
     # You can format what is printed to text box 
        logTextBox.setFormatter(logging.Formatter('%(asctime)s - %(levelname)s - %(message)s')) 
        logging.getLogger().addHandler(logTextBox)
        logging.getLogger().addHandler(fh)
     # You can control the logging level 
        logging.getLogger().setLevel(logging.INFO) 

        layout = QtWidgets.QVBoxLayout() 
     # Add the new logging box widget to the layout 
        layout.addWidget(logTextBox.widget) 
        self.setLayout(layout) 
        self.resize(800, 600)

    @classmethod
    def errorLog(etype, value, tb):
        error_msg = ''.join(traceback.format_exception(etype, value, tb))
        logging.error(error_msg)
    # do something with the error message, for example print it 

    def infoLog(self, info):
        logging.info(info)

    def warningLog(self, warning):
        logging.warning(warning) 

    def closeEvent(self, event):
        self.hide()

if __name__ == '__main__': 
    app = None 
    if (not QtWidgets.QApplication.instance()): 
        app = QtWidgets.QApplication([]) 
    dlg = LogWindow() 
    dlg.show() 
    dlg.raise_() 
    if (app): 
        app.exec_()