# -*- coding: utf-8 -*-
"""
Project: Analyse worldwide COVID-19 Data and provide graphs etc.

@author Patrick Müller
"""
import sys
from datetime import datetime
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
import Analyser as ana


class UserInterface(QWidget):
	def __init__(self, app):
		super().__init__()
		# Get Analyser instance and required stuff from it
		self.analyser = ana.Analyser()
		countries = self.analyser.getAvailableCountries()
		dates = self.analyser.getAvailableDates()

		# PyQT Setup
		self.setWindowTitle('COVID-19 Analytics')
		screen_width, screen_height = app.desktop().screenGeometry().width(), app.desktop().screenGeometry().height()
		# screen_width, screen_height = 3840, 2160
		self.setGeometry(((screen_width / 2) - 750), ((screen_height / 2) - 375), 1500, 750)
		self.setMinimumWidth(1300)

		# Layout boxes
		self.header_box = QHBoxLayout()
		h2box1 = QHBoxLayout()
		labelBox = QHBoxLayout()
		picklistBox = QHBoxLayout()
		buttonBox = QHBoxLayout()
		caseNumberBox = QHBoxLayout()
		self.graphBox = QHBoxLayout()

		# Heading
		heading = QLabel('<h1>COVID-19 Analytics</h1>')
		self.header_box.addWidget(heading)

		# Sub-Header
		subheader1 = QLabel('<h2>Statistics about one country</h2>')
		h2box1.addWidget(subheader1)

		# Country Picker
		countryPickerLabel = QLabel('<h3>Pick a country:</h3>')
		labelBox.addWidget(countryPickerLabel)
		self.countryPicker = QComboBox(parent=self)
		self.countryPicker.addItems(countries)
		self.countryPicker.setCurrentText('Germany')
		picklistBox.addWidget(self.countryPicker, 1)

		# Start Date Picker
		startDatePickerLabel = QLabel('<h3>Pick a start date:</h3>')
		labelBox.addWidget(startDatePickerLabel)
		self.startDatePicker = QComboBox(parent=self)
		self.startDatePicker.addItems(dates)
		self.startDatePicker.setCurrentText('2019-12-31')
		picklistBox.addWidget(self.startDatePicker, 1)

		# End Date Picker
		endDatePickerLabel = QLabel('<h3>Pick an end date:</h3>')
		labelBox.addWidget(endDatePickerLabel)
		self.endDatePicker = QComboBox(parent=self)
		self.endDatePicker.addItems(dates)
		self.endDatePicker.setCurrentText(datetime.now().strftime('%Y-%m-%d'))
		picklistBox.addWidget(self.endDatePicker, 1)

		# Calculate Button
		self.calculateSingleCountryStats = QPushButton('Calculate')
		buttonBox.addWidget(self.calculateSingleCountryStats)
		self.calculateSingleCountryStats.setCheckable(True)
		self.calculateSingleCountryStats.clicked.connect(self.btnstate)

		# Total cases number
		self.casesNumber = QLabel('<h4>Total Case Number: NaN</h4>')
		caseNumberBox.addWidget(self.casesNumber)

		# Generate Layout
		layout = QVBoxLayout()
		layout.addLayout(self.header_box)
		layout.addSpacing(50)
		layout.addLayout(h2box1)
		layout.addSpacing(10)
		layout.addLayout(labelBox)
		layout.addLayout(picklistBox)
		layout.addSpacing(10)
		layout.addLayout(buttonBox)
		layout.addSpacing(10)
		layout.addLayout(caseNumberBox)
		layout.addSpacing(10)
		layout.addLayout(self.graphBox)
		layout.addStretch(1)

		self.setLayout(layout)
		self.show()

	def btnstate(self):
		if self.calculateSingleCountryStats.isChecked():
			# To reset the button
			print('pressed')
			self.calculateSingleCountryStats.toggle()
			country = self.countryPicker.currentText()
			startDate = self.startDatePicker.currentText()
			endDate = self.endDatePicker.currentText()
			casesGraphPath = self.analyser.getCasesGraph(country, startDate, endDate)
			caseIncreaseGraphPath = self.analyser.getCaseIncreaseGraph(country, startDate, endDate)
			self.casesNumber.setText(
				('<h4>Total case number in ' + country + ' as of ' + endDate + ': ' + str(self.analyser.getTotalCases(country,
																											  endDate))+'</h4>'))
			self.casesGraphPlaceHolder = QLabel(self)
			self.casesIncreasePlaceHolder = QLabel(self)
			self.clearLayout(self.graphBox)
			self.graphBox.addWidget(self.casesGraphPlaceHolder)
			self.graphBox.addWidget(self.casesIncreasePlaceHolder)
			self.casesGraphPlaceHolder.setPixmap(QPixmap(casesGraphPath))
			self.casesIncreasePlaceHolder.setPixmap(QPixmap(caseIncreaseGraphPath))

	def clearLayout(self, layout):
		for i in reversed(range(layout.count())):
			widgetToRemove = layout.itemAt(i).widget()
			# remove it from the layout list
			layout.removeWidget(widgetToRemove)
			# remove it from the gui
			widgetToRemove.setParent(None)


def main():
	app = QApplication(sys.argv)
	ex = UserInterface(app)
	sys.exit(app.exec_())