# -*- coding: utf-8 -*-
import multiprocessing
import os
import sys
import traceback

from PySide2.QtCore import QThread, Signal, Qt, Slot, QRunnable, QObject
from PySide2.QtWidgets import QDialog, QProgressBar, QLabel, QHBoxLayout, QPushButton


class Thread(QThread):
    message = Signal(str)

    def __init__(self, parent, func, arg=None, progressText=None,
                 pb_widget=None, redirect_stdout=False, abortButton=False):
        QThread.__init__(self, parent)
        self.func = func
        self.arg = arg
        self.progressText = progressText
        self.pb_widget = pb_widget
        self.redirect_stdout = redirect_stdout
        self.abortButton = abortButton
        self.finished.connect(self.hideProgressbar)
        self.showProgressbar()
        self.old_stdout = None

    def run(self):
        if self.redirect_stdout:
            self.old_stdout = sys.stdout
            sys.stdout = self
        try:
            if self.arg is not None:
                self.data = self.func(self.arg)
            else:
                self.data = self.func()
            self._executed = True
        except Exception as e:
            self._executed = False
            self._executedError = e
            traceback.print_exc()
            exctype, value = sys.exc_info()[:2]
            self._executedErrorInfo = '{} {} {}'. \
                format(exctype, value, traceback.format_exc())
        sys.stdout = self.old_stdout

    def showProgressbar(self):
        if self.progressText:
            # # generate widget if not given in init
            # if not self.pb_widget:
            #     self.pb_widget = ProgressBarWidget(self.parent())
            #     self.pb_widget.setWindowFlags(Qt.SplashScreen)
            #     self.pb_widget.setModal(True)

            # generate widget if not given in init
            if not self.pb_widget:
                self.pb_widget = QDialog(self.parent())
                self.pb_widget.setWindowFlags(Qt.SplashScreen)
                self.pb_widget.setModal(True)

            # add button
            delete_button = QPushButton('X')
            delete_button.clicked.connect(self.exit)
            hl = QHBoxLayout()
            pb = QProgressBar()
            pb.setRange(0, 0)
            hl.addWidget(pb)
            hl.addWidget(QLabel(self.progressText))
            if self.abortButton:
                hl.addWidget(delete_button)
            self.pb_widget.setLayout(hl)
            self.pb_widget.show()

    def hideProgressbar(self):
        if self.pb_widget:
            self.pb_widget.hide()

    def write(self, text):
        self.message.emit(text)

    def flush(self):
        pass


class Worker(QRunnable):
    '''
    Worker class to be run by MultiThread(QThread).
    '''

    def __init__(self, fun, args,
                 progressText=None,
                 pb_widget=None,
                 redirect_stdout=False):
        super(Worker, self).__init__()
        self.fun = fun
        self.args = args
        # self.kwargs = kwargs
        self.signals = WorkerSignals()
        self.progressText = progressText
        self.pb_widget = pb_widget
        self.redirect_stdout = redirect_stdout
        self.old_stdout = None

    @Slot()
    def run(self):
        if self.redirect_stdout:
            self.old_stdout = sys.stdout
            sys.stdout = self

        try:
            result = self.fun(self.args)
        except:
            exctype, value = sys.exc_info()[:2]
            print(exctype, value, traceback.format_exc())
            self.signals.error.emit((exctype, value, traceback.format_exc()))
        else:
            self.signals.result.emit(result)
        finally:
            self.signals.finished.emit('Done')
        sys.stdout = self.old_stdout

    def write(self, text):
        self.signals.message.emit(text)

    def flush(self):
        pass


class WorkerSignals(QObject):
    '''
    Class to provide signals for Worker Class
    '''
    finished = Signal(str)
    message = Signal(str)
    error = Signal(tuple)
    result = Signal(object)


class MultiThread(QThread):
    finished = Signal(str)
    message = Signal(str)

    def __init__(self, parent, func, args, ncores=1,
                 progressText=None, pb_widget=None, redirect_stdout=False):
        QThread.__init__(self, parent)
        self.func = func
        self.args = args
        self.ncores = ncores
        self.progressText = progressText
        self.pb_widget = pb_widget
        self.redirect_stdout = redirect_stdout
        self.old_stdout = None
        self.finished.connect(self.hideProgressbar)
        self.showProgressbar()

    def run(self):
        if self.redirect_stdout:
            self.old_stdout = sys.stdout
            sys.stdout = self
        try:
            if not self.ncores:
                self.ncores = multiprocessing.cpu_count()
            pool = multiprocessing.Pool(self.ncores)
            self.data = pool.map_async(self.func, self.args, callback=self.emitDone)
            # self.data = pool.apply_async(self.func, self.shotlist, callback=self.emitDone) #emit each time returned
            pool.close()
            self._executed = True
        except Exception as e:
            self._executed = False
            self._executedError = e
            exc_type, exc_obj, exc_tb = sys.exc_info()
            fname = os.path.split(exc_tb.tb_frame.f_code.co_filename)[1]
            print('Exception: {}, file: {}, line: {}'.format(exc_type, fname, exc_tb.tb_lineno))
        sys.stdout = self.old_stdout

    def showProgressbar(self):
        if self.progressText:
            if not self.pb_widget:
                self.pb_widget = QDialog(self.parent())
                self.pb_widget.setWindowFlags(Qt.SplashScreen)
                self.pb_widget.setModal(True)
            hl = QHBoxLayout()
            pb = QProgressBar()
            pb.setRange(0, 0)
            hl.addWidget(pb)
            hl.addWidget(QLabel(self.progressText))
            self.pb_widget.setLayout(hl)
            self.pb_widget.show()

    def hideProgressbar(self):
        if self.pb_widget:
            self.pb_widget.hide()

    def write(self, text):
        self.message.emit(text)

    def flush(self):
        pass

    def emitDone(self, result):
        print('emitDone!')
        self.finished.emit('Done thread!')
        self.hideProgressbar()