#!/usr/bin/python

''' Hypervideo GUI '''

import sys

from PyQt5.QtCore import (
    QFile,
    QPoint,
    QRect,
    QSize,
    QStandardPaths,
    Qt,
    QProcess,
    QSettings
)

from PyQt5.QtGui import QIcon, QFont, QClipboard
from PyQt5.QtWidgets import (
    QAction,
    QApplication,
    QComboBox,
    QFileDialog,
    QHBoxLayout,
    QLineEdit,
    QLabel,
    QMainWindow,
    QMessageBox,
    QProgressBar,
    QPushButton,
    QToolButton,
    QVBoxLayout,
    QWidget,
)

# Debuging
if len(sys.argv) == 2:
    if sys.argv[1] == '-v':
        DEBUG = 0
    else:
        DEBUG = None
else:
    DEBUG = None

__version__ = '1.0.1'
__license__ = 'GPL-3'
__title__ = 'Simple Hypervideo Download GUI'


class MainWindow(QMainWindow):
    def __init__(self):
        ''' Initial '''
        super(MainWindow, self).__init__()

        self.hypervideo_bin = None
        self.url_catch = None

        self.out_folder_path = '/tmp/'

        self.settings = QSettings('YouTubeDL', 'YTDL')
        self.setAttribute(Qt.WA_DeleteOnClose)
        self.create_status_bar()
        pyfile = QStandardPaths.findExecutable("hypervideo")
        if not pyfile == "":
            debugging('Found executable: %s' % pyfile)
            self.hypervideo_bin = pyfile
        else:
            self.msgbox("hypervideo not found\nPlease install hypervideo")

        self.default_formats_menu_items = ['Video/Audio - Best Quality',
                                           'Audio Only - Best Quality']

        self.list = []

        self.init_ui()

    def init_ui(self):
        ''' Initial UI '''

        self.setWindowTitle(__title__)

        btnwidth = 155

        self.cmd = None
        self.process = QProcess(self)
        self.process.started.connect(lambda: self.show_message("Creating List"))
        self.process.started.connect(lambda: self.btn_get_formats.setEnabled(False))
        self.process.finished.connect(lambda: self.show_message("Finished creating List"))
        self.process.finished.connect(self.process_finished)
        self.process.finished.connect(lambda: self.btn_get_formats.setEnabled(True))
        self.process.readyRead.connect(self.process_output)

        self.download_process = QProcess(self)
        self.download_process.setProcessChannelMode(QProcess.MergedChannels)
        self.download_process.started.connect(lambda: self.show_message("Download started"))
        self.download_process.started.connect(lambda: self.download_button.setEnabled(False))
        self.download_process.started.connect(lambda: self.cancel_button.setEnabled(True))
        self.download_process.finished.connect(lambda: self.show_message("Download finished"))
        self.download_process.finished.connect(lambda: self.download_button.setEnabled(True))
        self.download_process.finished.connect(lambda: self.cancel_button.setEnabled(False))
        self.download_process.finished.connect(lambda: self.setWindowTitle(__title__))
        self.download_process.readyRead.connect(self.dl_process_out)

        self.setGeometry(0, 0, 600, 250)
        self.setFixedSize(600, 250)
        self.setStyleSheet(ui_style_sheet(self))
        self.setWindowIcon(QIcon.fromTheme("video-playlist"))

        # Menu
        main_menu = self.menuBar()
        file_menu = main_menu.addMenu('File')
        help_menu = main_menu.addMenu('Help')

        # Exit button
        exit_button = QAction('Exit', self)
        exit_button.setShortcut('Ctrl+Q')
        exit_button.setStatusTip('Exit application')
        exit_button.triggered.connect(self.close)

        # About button
        about_button = QAction('About', self)
        about_button.triggered.connect(self.on_button_clicked)

        # Adding buttons to Menu
        help_menu.addAction(about_button)
        file_menu.addAction(exit_button)

        # Path
        lbl_url = QLabel()
        lbl_url.setText("Insert URL/ID:")
        lbl_url.setAlignment(Qt.AlignRight)
        lbl_url.setFixedWidth(btnwidth)
        lbl_url.setAlignment(Qt.AlignCenter | Qt.AlignVCenter)
        self.lbl_url_path = QLineEdit()
        self.lbl_url_path.setPlaceholderText('https://invidio.us/watch?v=8SdPLG-_wtA')
        # Set up callback to update video formats when URL is changed
        self.lbl_url_path.textChanged.connect(self.reset_video_formats)

        hlayout = QHBoxLayout()
        hlayout.addWidget(lbl_url)
        hlayout.addWidget(self.lbl_url_path)

        # Output path
        btn_out_path = QToolButton()
        btn_out_path.setToolButtonStyle(Qt.ToolButtonTextBesideIcon)
        btn_out_path.setText("Select Output Folder")
        btn_out_path.setFixedWidth(btnwidth)
        btn_out_path.clicked.connect(self.open_output_folder)
        self.lbl_out_path = QLineEdit()
        self.lbl_out_path.setPlaceholderText("Insert Output Folder Path")
        self.lbl_out_path.textChanged.connect(self.update_output_path)

        hlayout2 = QHBoxLayout()
        hlayout2.addWidget(btn_out_path)
        hlayout2.addWidget(self.lbl_out_path)

        # Hypervideo path
        btn_hypervideo_path = QToolButton()
        btn_hypervideo_path.setToolButtonStyle(Qt.ToolButtonTextBesideIcon)
        btn_hypervideo_path.setText("Select hypervideo")
        btn_hypervideo_path.setFixedWidth(btnwidth)
        btn_hypervideo_path.clicked.connect(self.select_hyper_dl)
        self.lbl_hypervideo_path = QLineEdit(str(self.hypervideo_bin))
        self.lbl_hypervideo_path.textChanged.connect(self.update_hypervideo_path)
        self.lbl_hypervideo_path.setPlaceholderText("Insert Path to Hypervideo")

        hlayout3 = QHBoxLayout()
        hlayout3.addWidget(btn_hypervideo_path)
        hlayout3.addWidget(self.lbl_hypervideo_path)

        self.download_button = QToolButton()
        self.download_button.setToolButtonStyle(Qt.ToolButtonTextBesideIcon)
        self.download_button.setText("Download")
        self.download_button.clicked.connect(self.download_selected)
        self.download_button.setFixedWidth(btnwidth)
        self.download_button.setFixedHeight(32)

        self.btn_get_formats = QToolButton()
        self.btn_get_formats.setText('Get Formats')
        self.btn_get_formats.setFixedWidth(btnwidth)
        self.btn_get_formats.setFixedHeight(32)
        self.btn_get_formats.clicked.connect(self.fill_combo_formats)

        self.cancel_button = QToolButton()
        self.cancel_button.setToolButtonStyle(Qt.ToolButtonTextBesideIcon)
        self.cancel_button.setText("Cancel")
        self.cancel_button.clicked.connect(self.cancel_download)
        self.cancel_button.setEnabled(False)
        self.cancel_button.setFixedWidth(btnwidth)
        self.cancel_button.setFixedHeight(32)

        self.video_format_combobox = QComboBox()
        self.populate_video_format_combobox(self.default_formats_menu_items)
        self.video_format_combobox.setFixedHeight(26)

        self.pbar = QProgressBar()
        self.pbar.setFixedHeight(16)
        self.pbar.setMaximum(100)
        self.pbar.setMinimum(0)
        self.pbar.setValue(0)

        btn_layout = QHBoxLayout()
        btn_layout.addWidget(self.download_button)
        btn_layout.addWidget(self.btn_get_formats)
        btn_layout.addWidget(self.cancel_button)

        vlayout = QVBoxLayout()
        vlayout.addLayout(hlayout)
        vlayout.addLayout(hlayout2)
        vlayout.addLayout(hlayout3)
        vlayout.addWidget(self.video_format_combobox)
        vlayout.addWidget(self.pbar)
        vlayout.addLayout(btn_layout)

        main_widget = QWidget()
        main_widget.setLayout(vlayout)
        self.setCentralWidget(main_widget)

        # Copy URL of clipboard
        self.clip = QApplication.clipboard()
        if self.clip.text().startswith("http"):
            self.lbl_url_path.setText(self.clip.text())
            self.fill_combo_formats()

        self.read_settings()

    def on_button_clicked(self):
        """ Button about """
        msg = QMessageBox()

        msg.setWindowTitle('About us')
        msg.setText("<p align='center'>Written with Python3 and PyQt5<br>"
                    "Version: %s <br> License: %s </p>" % (__version__, __license__))
        msg.setIcon(QMessageBox.Information)
        self.show()

        msg.exec_()

    def closeEvent(self, event):
        '''Protected Function for PyQt5
           gets called when the user closes the GUI.
        '''
        self.write_settings()

        close = QMessageBox()
        close.setIcon(QMessageBox.Question)
        close.setWindowTitle('Exit')
        close.setText('You sure?')
        close.setStandardButtons(QMessageBox.Yes | QMessageBox.Cancel)
        close = close.exec()

        if close == QMessageBox.Yes:
            event.accept()
        else:
            event.ignore()

    def read_settings(self):
        ''' Read config '''
        debugging('Reading settings')
        if self.settings.contains('geometry'):
            self.setGeometry(self.settings.value('geometry'))
        if self.settings.contains('outFolder'):
            self.lbl_out_path.setText(self.settings.value('outFolder'))

    def write_settings(self):
        ''' Save Settings '''
        debugging('Writing settings')
        self.settings.setValue('outFolder', self.out_folder_path)
        self.settings.setValue('geometry', self.geometry())

    def update_output_path(self):
        ''' Update Path Output '''
        self.out_folder_path = self.lbl_out_path.text()
        self.show_message("Output path changed to: %s" % self.lbl_out_path.text())

    def update_hypervideo_path(self):
        ''' Update Hypervideo Path Output '''
        self.hypervideo_bin = self.lbl_hypervideo_path.text()
        self.show_message("hypervideo path changed to: %s" % self.lbl_hypervideo_path.text())

    def show_message(self, message):
        ''' Show Message in StatuBar '''
        self.statusBar().showMessage(message, 0)

    def select_hyper_dl(self):
        ''' Select hypervideo executable '''
        file_name, _ = QFileDialog.getOpenFileName(self, "locate hypervideo",
                                                   "/usr/bin/hypervideo", "exec Files (*)")
        debugging('Value of filename is %s' % file_name)
        if file_name:
            self.lbl_hypervideo_path.setText(file_name)
            self.hypervideo_bin = file_name

    def open_output_folder(self):
        ''' Open out folder path '''
        dlg = QFileDialog()
        dlg.setFileMode(QFileDialog.Directory)
        d_path = dlg.getExistingDirectory()
        if d_path:
            self.lbl_out_path.setText(d_path)

    def populate_video_format_combobox(self, labels):
        '''Populate the video format combobox with video formats. Clear the previous labels.
        labels {list} -- list of strings representing the video format combobox options
        '''
        self.video_format_combobox.clear()
        for label in labels:
            self.video_format_combobox.addItem(label)

    def reset_video_formats(self):
        ''' Clean video formast '''
        idx = self.video_format_combobox.currentIndex()

        self.populate_video_format_combobox(self.default_formats_menu_items)

        # preserve combobox index if possible
        if idx > 1:
            self.video_format_combobox.setCurrentIndex(0)
        else:
            self.video_format_combobox.setCurrentIndex(idx)

    def fill_combo_formats(self):
        ''' Scan formats and Add item to combobox '''
        self.video_format_combobox.clear()

        if QFile.exists(self.hypervideo_bin):
            # Default options
            self.video_format_combobox.addItems(self.default_formats_menu_items[0:2])
            self.list = []
            self.url_catch = self.lbl_url_path.text()
            if not self.lbl_url_path.text() == "":
                debugging('Scan Formats')
                self.process.start(self.hypervideo_bin, ['-F', self.url_catch])
            else:
                self.show_message("URL empty")
        else:
            self.show_message("hypervideo missing")

    def process_output(self):
        ''' Process out '''
        try:
            output = str(self.process.readAll(), encoding='utf8').rstrip()
        except TypeError:
            output = str(self.process.readAll()).rstrip()
        self.list.append(output)

    def process_finished(self):
        ''' Process Finished '''
        out = ','.join(self.list)
        out = out.partition("resolution note")[2]
        out = out.partition('\n')[2]
        mylist = out.rsplit('\n')
        debugging('Formats process finished with list: %s' % mylist)
        if mylist != ['']:
            self.video_format_combobox.addItems(mylist)
            count = self.video_format_combobox.count()
            self.video_format_combobox.setCurrentIndex(count-1)
        else:
            self.show_message("Formats empty or URL without video")

    def download_selected(self):
        ''' Download selected video format '''
        if QFile.exists(self.hypervideo_bin):
            self.pbar.setValue(0)
            self.url_catch = self.lbl_url_path.text()
            quality = None
            if self.video_format_combobox.currentText() == self.default_formats_menu_items[0]:
                quality = 'bestvideo+bestaudio/best'
                options = []
                options.append('-f')
                options.append(quality)
            elif self.video_format_combobox.currentText() == self.default_formats_menu_items[1]:
                quality = '--audio-quality'
                options = []
                options.append('-x')
                options.append('--audio-format')
                options.append('mp3')
                options.append(quality)
                options.append('192')
            else:
                quality = self.video_format_combobox.currentText().partition(" ")[0]
                options = []
                options.append('-f')
                options.append(quality)
            if self.url_catch != '':
                if quality is not None:
                    options.append("-o")
                    options.append("%(title)s.%(ext)s")
                    options.append(self.url_catch)
                    self.show_message("Download started")
                    debugging('Download Selected Quality: %s' % quality)
                    debugging('Download URL: %s' % self.url_catch)
                    self.download_process.setWorkingDirectory(self.out_folder_path)
                    self.download_process.start(self.hypervideo_bin, options)
                else:
                    self.show_message("List of available files is empty")
            else:
                self.show_message("URL empty")
        else:
            self.show_message("hypervideo missing")

    def dl_process_out(self):
        ''' Download process out '''
        try:
            out = str(self.download_process.readAll(), encoding='utf8').rstrip()
        except TypeError:
            out = str(self.download_process.readAll()).rstrip()
        out = out.rpartition("[download] ")[2]
        self.show_message("Progress: %s" % out)
        self.setWindowTitle(out)
        out = out.rpartition("%")[0].rpartition(".")[0]
        if not out == "":
            try:
                pout = int(out)
                self.pbar.setValue(pout)
            except ValueError:
                pass

    def cancel_download(self):
        ''' Cancel download'''
        if self.download_process.state() == QProcess.Running:
            debugging('Process is running, will be cancelled')
            self.download_process.close()
            self.show_message("Download cancelled")
            self.pbar.setValue(0)
            self.cancel_button.setEnabled(False)
        else:
            self.show_message("Process is not running")

    def create_status_bar(self):
        ''' Create StatusBar'''
        self.statusBar().showMessage("Ready")

    def msgbox(self, message):
        ''' MessageBox'''
        QMessageBox.warning(self, "Message", message)


def debugging(var):
    ''' Debugging '''
    if DEBUG == 0:
        message_debug = print('[debug] %s' % var)
    else:
        message_debug = None
    return message_debug

def ui_style_sheet(self):
    return """
QStatusBar
{
font-family: Helvetica;
font-size: 8pt;
color: #666666;
}
QProgressBar:horizontal {
border: 1px solid gray;
text-align: top;
padding: 1px;
border-radius: 3px;
background: QLinearGradient( x1: 0, y1: 0, x2: 1, y2: 0,
stop: 0 #fff,
stop: 0.4999 #eee,
stop: 0.5 #ddd,
stop: 1 #eee );
width: 15px;
}
QProgressBar::chunk:horizontal
{
background: QLinearGradient( x1: 0, y1: 0, x2: 1, y2: 0,
stop: 0 #5baaf5,
stop: 0.4999 #4ba6f5,
stop: 0.5 #3ba6f5,
stop: 1 #00aaff );
border-radius: 3px;
border: 1px solid black;
}
"""