from __future__ import absolute_import

from PyQt5.QtCore import QPoint, QSize, Qt
from PyQt5.QtGui import QIcon
from PyQt5.QtWidgets import QLabel, QSizePolicy, QToolButton, QWidget

from TriblerGUI.tribler_window import fc_home_recommended_item
from TriblerGUI.utilities import format_size, get_image_path

HOME_ITEM_FONT_SIZE = 44


class HomeRecommendedItem(QWidget, fc_home_recommended_item):
    """
    This class represents a HomeRecommendedItem widget which is shown on the home page. This widget can either show
    a channel or a torrent.
    """

    def __init__(self, parent):
        QWidget.__init__(self, parent)
        fc_home_recommended_item.__init__(self)

        self.setupUi(self)

        self.show_torrent = True
        self.torrent_info = None
        self.channel_info = None
        self.download_uri = None
        self.dialog = None

        # Create the category label, shown on cells that display a torrent on the home page
        self.category_label = QLabel(self)
        self.category_label.setFixedHeight(24)
        self.category_label.setSizePolicy(QSizePolicy(QSizePolicy.MinimumExpanding, QSizePolicy.Fixed))
        self.category_label.setStyleSheet("""
        border: 2px solid white;
        border-radius: 12px;
        background-color: transparent;
        color: white;
        padding-left: 4px;
        padding-right: 4px;
        font-weight: bold;
        """)
        self.category_label.move(QPoint(6, 6))
        self.category_label.show()

        # Create the dark overlay and download button over the thumbnail on hover
        self.dark_overlay = QWidget(self)
        self.dark_overlay.setStyleSheet("background-color: rgba(0, 0, 0, 0.65);")
        self.dark_overlay.hide()

        self.download_button = QToolButton(self)
        self.download_button.setFixedSize(QSize(40, 40))
        self.download_button.setStyleSheet("""
        QToolButton {
            background-color: transparent;
            border: 2px solid white;
            border-radius: 20px;
        }

        QToolButton::hover {
            border: 2px solid #B5B5B5;
        }
        """)
        self.download_button.setIcon(QIcon(get_image_path('downloads.png')))
        self.download_button.setIconSize(QSize(18, 18))
        self.download_button.clicked.connect(self.on_download_button_clicked)
        self.download_button.hide()

        self.setContentsMargins(0, 0, 10, 10)

    def on_download_button_clicked(self):
        if not self.torrent_info:
            return
        self.download_uri = (u"magnet:?xt=urn:btih:%s&dn=%s" %
                             (self.torrent_info["infohash"], self.torrent_info['name'])).encode('utf-8')
        self.window().start_download_from_uri(self.download_uri)

    def update_with_torrent(self, torrent):
        if not torrent:
            return
        self.show_torrent = True
        self.torrent_info = torrent
        self.thumbnail_widget.initialize(torrent["name"], HOME_ITEM_FONT_SIZE)
        self.main_label.setText(torrent["name"])
        self.category_label.setText(torrent["category"].lower() if
                                    ("category" in torrent and torrent["category"]) else 'other')
        self.category_label.adjustSize()
        self.category_label.setHidden(False)
        self.setCursor(Qt.ArrowCursor)
        self.detail_label.setText("Size: " + format_size(torrent.get("size", 0)))

    def update_with_channel(self, channel):
        if not channel:
            return
        self.show_torrent = False
        self.channel_info = channel
        self.thumbnail_widget.initialize(channel["name"], HOME_ITEM_FONT_SIZE)

        self.main_label.setText(channel["name"])
        self.detail_label.setText("%d torrents" % channel["torrents"])
        self.category_label.setHidden(True)
        self.setCursor(Qt.PointingHandCursor)

    def enterEvent(self, _):
        if self.show_torrent:
            self.dark_overlay.resize(self.thumbnail_widget.size())
            self.dark_overlay.show()
            self.download_button.move((self.thumbnail_widget.width() - self.download_button.width()) / 2,
                                      (self.thumbnail_widget.height() - self.download_button.height()) / 2)
            self.download_button.show()

    def leaveEvent(self, _):
        self.dark_overlay.hide()
        self.download_button.hide()
