#!/usr/bin/env python3
# -*- coding: utf-8 -*-

# Copyright (C) 2018 Andy Stewart
#
# Author:     Andy Stewart <lazycat.manatee@gmail.com>
# Maintainer: Andy Stewart <lazycat.manatee@gmail.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

from PyQt5.QtCore import Qt
from PyQt5.QtGui import QColor, QPixmap, QImage, QFont
from PyQt5 import QtGui, QtCore
from PyQt5.QtGui import QColor, QPixmap, QPainter
from PyQt5.QtWidgets import QApplication
from PyQt5.QtWidgets import QWidget, QLabel
from PyQt5.QtWidgets import QWidget, QVBoxLayout
import http.server as BaseHTTPServer
import os
import qrcode
import shutil
import socket
import sys
import threading
from core.buffer import Buffer

class AppBuffer(Buffer):
    def __init__(self, buffer_id, url):
        Buffer.__init__(self, buffer_id, url, False, QColor(0, 0, 0, 255))

        self.add_widget(FileTransferWidget(url, QColor(0, 0, 0, 255)))

class SimpleHTTPRequestHandler(BaseHTTPServer.BaseHTTPRequestHandler):

    def do_GET(self):
        global local_file_path

        try:

            with open(local_file_path, 'rb') as f:
                self.send_response(200)
                self.send_header("Content-Type", 'application/octet-stream')
                self.send_header("Content-Disposition", 'attachment; filename="{}"'.format(os.path.basename(local_file_path)))
                fs = os.fstat(f.fileno())
                self.send_header("Content-Length", str(fs.st_size))
                self.end_headers()
                shutil.copyfileobj(f, self.wfile)
        except socket.error:
            # Don't need handle socket error.
            pass

class Image(qrcode.image.base.BaseImage):
    def __init__(self, border, width, box_size):
        self.border = border
        self.width = width
        self.box_size = box_size
        size = (width + border * 2) * box_size
        self._image = QtGui.QImage(size, size, QtGui.QImage.Format_RGB16)
        self._image.fill(QtCore.Qt.white)

    def pixmap(self):
        return QtGui.QPixmap.fromImage(self._image)

    def drawrect(self, row, col):
        painter = QtGui.QPainter(self._image)
        painter.fillRect(
            (col + self.border) * self.box_size,
            (row + self.border) * self.box_size,
            self.box_size, self.box_size,
            QtCore.Qt.black)

    def save(self, stream, kind=None):
        pass

class FileTransferWidget(QWidget):
    def __init__(self, url, color):
        QWidget.__init__(self)
        self.setStyleSheet("background-color: black");

        file_path = os.path.expanduser(url)

        self.file_name_font = QFont()
        self.file_name_font.setPointSize(24)

        self.file_name_label = QLabel(self)
        self.file_name_label.setText(file_path)
        self.file_name_label.setFont(self.file_name_font)
        self.file_name_label.setAlignment(Qt.AlignCenter)
        self.file_name_label.setStyleSheet("color: #eee");

        self.qrcode_label = QLabel(self)

        self.notify_font = QFont()
        self.notify_font.setPointSize(12)
        self.notify_label = QLabel(self)
        self.notify_label.setText("Scan above QR and open link by browser to start downloading.\nMake sure that your smartphone is connected to the same WiFi network as this computer.")
        self.notify_label.setFont(self.notify_font)
        self.notify_label.setAlignment(Qt.AlignCenter)
        self.notify_label.setStyleSheet("color: #eee");

        layout = QVBoxLayout(self)
        layout.setContentsMargins(0, 0, 0, 0)
        layout.addStretch()
        layout.addWidget(self.qrcode_label, 0, Qt.AlignCenter)
        layout.addSpacing(20)
        layout.addWidget(self.file_name_label, 0, Qt.AlignCenter)
        layout.addSpacing(40)
        layout.addWidget(self.notify_label, 0, Qt.AlignCenter)
        layout.addStretch()

        self.start_server(file_path)

    def set_address(self, address):
        self.qrcode_label.setPixmap(qrcode.make(address, image_factory=Image).pixmap())

    def get_local_ip(self):
        try:
            s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
            s.connect(("8.8.8.8", 80))
            return s.getsockname()[0]
        except OSError:
            print("Network is unreachable")
            sys.exit()

    def get_free_port(self):
        """
        Determines a free port using sockets.
        """
        free_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        free_socket.bind(('0.0.0.0', 0))
        free_socket.listen(5)
        port = free_socket.getsockname()[1]
        free_socket.close()

        return port

    def start_server(self, filename):
        global local_file_path

        local_file_path = filename

        self.port = self.get_free_port()
        self.local_ip = self.get_local_ip()
        self.set_address("http://{0}:{1}/{2}".format(self.local_ip, self.port, filename))

        t = threading.Thread(target=self.run_http_server, name='LoopThread')
        t.start()

    def run_http_server(self):
        httpd = BaseHTTPServer.HTTPServer(('', self.port), SimpleHTTPRequestHandler)
        httpd.serve_forever()

if __name__ == "__main__":
    from PyQt5.QtWidgets import QApplication
    import sys
    import signal
    app = QApplication(sys.argv)

    test = FileTransferWidget("/home/andy/rms/1.jpg", QColor(0, 0, 0, 255))
    test.show()

    signal.signal(signal.SIGINT, signal.SIG_DFL)
    sys.exit(app.exec_())