import logging
import socket
from typing import List

from PyQt5.QtCore import Qt, QEvent
from PyQt5.QtWidgets import QMainWindow, QLabel
from sortedcontainers import SortedList

from shared import constants
from shared import helpers
from client.ui.MainWindow import Ui_MainWindow
from client.worker import ReceiveWorker

IP = '127.0.0.1'
PORT = 55555

logging.basicConfig(format='[%(asctime)s] [%(levelname)s] [%(threadName)s] %(message)s')
logger = logging.getLogger('gui')
logger.setLevel(logging.DEBUG)


class MainWindow(QMainWindow, Ui_MainWindow):
    def __init__(self, ip: str, port: int, nickname: str, *args, **kwargs):
        # Initial UI setup
        super(MainWindow, self).__init__(*args, **kwargs)
        self.setupUi(self)
        self.show()

        self.ip, self.port, self.nickname = ip, port, nickname
        self.closed = False

        # Connect to server
        self.client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        # TODO: Research more socket options, possibly improving client functionality
        self.client.connect((ip, port))

        # Setup message receiving thread worker
        self.receiveThread = ReceiveWorker(self.client, self.nickname)
        self.receiveThread.messages.connect(self.add_message)  # Adding new messages
        self.receiveThread.client_list.connect(self.update_connections)  # Updating the connections list
        self.receiveThread.logs.connect(self.log)  # Receiving logging messages from a thread
        self.receiveThread.data_stats.connect(self.count_stats)  # Receiving data usage stats
        # TODO: Improve initial client/server data exchange
        self.receiveThread.start()

        # Setup message box return key logic
        self.messageBox.installEventFilter(self)

        self.data_stats = QLabel("0.00KB Sent, 0.00KB Received")
        self.data_stats.setAlignment(Qt.AlignVCenter)
        self.status_bar.addPermanentWidget(self.data_stats)

        # Variables for managing
        self.messages = SortedList(key=lambda message: message['time'])
        self.added_messages = []
        self.max_message_id = -1

        self.sent, self.received = 0, 0

    def count_stats(self, sent: bool, change: int) -> None:
        """Handler for counting data statistics."""
        if change != 0:
            if sent:
                self.sent += change
            else:
                self.received += change
            self.data_stats.setText(f'{helpers.sizeof_fmt(self.sent)} Sent, '
                                    f'{helpers.sizeof_fmt(self.received)} Received')

    @staticmethod
    def log(log_data: dict) -> None:
        """Handler for data logging from a thread."""
        logger.log(level=log_data['level'], msg=log_data['message'], exc_info=log_data['error'])

    def closeEvent(self, event):
        """Handle closing by stopping the receive thread."""
        self.receiveThread.stop()
        event.accept()  # let the window close

    def eventFilter(self, obj, event) -> bool:
        if event.type() == QEvent.KeyPress and obj is self.messageBox:
            if event.key() == Qt.Key_Return and self.messageBox.hasFocus():
                self.send_message(self.messageBox.toPlainText())
                self.messageBox.clear()
                self.messageBox.setText('')
                cursor = self.messageBox.textCursor()
                cursor.setPosition(0)
                self.messageBox.setTextCursor(cursor)
                return True
        return super().eventFilter(obj, event)

    def refresh_messages(self) -> None:
        """Completely refresh the chat box text."""
        scrollbar = self.messageHistory.verticalScrollBar()
        last_position = scrollbar.value()
        at_maximum = last_position == scrollbar.maximum()

        self.messageHistory.setText('<br>'.join(
                msg['compiled'] for msg in self.messages
        ))

        scrollbar.setValue(scrollbar.maximum() if at_maximum else last_position)

    def send(self, data: bytes, **kwargs) -> None:
        self.count_stats(True, len(data))
        self.client.send(data, **kwargs)

    def add_message(self, message: dict) -> None:
        message_id = message['id']
        if message_id not in self.added_messages:
            message['compiled'] = helpers.formatted_message(message)

            if 0 <= message_id < self.max_message_id:
                logger.info('Refreshing entire chatbox...')
                self.max_message_id = message_id
                self.messages.add(message)
                return
            else:
                self.max_message_id = message_id
                self.added_messages.append(message_id)
                self.messages.add(message)

            self.refresh_messages()

    def send_message(self, message: str) -> None:
        message = message.strip()
        if len(message) > 0:
            self.send(helpers.prepare_json(
                    {
                        'type': constants.Types.MESSAGE,
                        'content': message
                    }
            ))

    def update_connections(self, users: List[dict]):
        """Update the Connections List widget"""
        self.connectionsList.clear()
        self.connectionsList.addItems([user['nickname'] for user in users])