from pathlib import Path
import webbrowser

from PyQt5 import QtCore, QtGui, QtNetwork, QtWebEngineWidgets, QtWidgets
from PyQt5.uic import loadUi


class Downloader(QtWidgets.QMainWindow):
    def __init__(self, tool_name, tool_info, download_directory, parent = None, flags = None):
        super().__init__(parent, flags)
        loadUi(Path(__file__).parent / "downloader.ui", baseinstance = self)
        self.hide()
        #create an off-the-record profile, isolated from other Downloader objects
        new_page = QtWebEngineWidgets.QtWebEnginePage(QtWebEngineWidgets.QWebEngineProfile(self.web_view))
        self.web_view.setPage(new_page)
        #set application style and decorate pushbuttons
        self._style = QtWidgets.QApplication.instance().style()
        self.setWindowIcon(QtWidgets.QApplication.instance().windowIcon())
        self.back_button.setIcon(self._style.standardIcon(self._style.SP_ArrowBack))
        self.forward_button.setIcon(self._style.standardIcon(self._style.SP_ArrowForward))
        self.reload_stop_button.setIcon(self._style.standardIcon(self._style.SP_BrowserReload))
        self.home_button.setIcon(self._style.standardIcon(self._style.SP_ArrowUp))
        #connect signals to make useable as a browser
        self.web_view.urlChanged.connect(lambda url: self.address_bar.setText(url.toString()))
        self.web_view.loadStarted.connect(self._reload_becomes_stop)
        self.web_view.loadFinished.connect(self._stop_becomes_reload)
        self.address_bar.returnPressed.connect(lambda: self.web_view.load(QtCore.QUrl(self.address_bar.text())))
        #connect cancel actions to handlers
        self.actionCancel.triggered.connect(self._cancel_manual_search)
        self.actionCancel_and_Open_Issue_on_Github.triggered.connect(self._cancel_manual_search_open_issue)
        #set attributes
        self._tool_name = tool_name
        self._tool_info = tool_info
        self._download_directory = download_directory
        #name window from attribute
        self.setWindowTitle(f"Find {self._tool_name}")
        #get homepage from attributes and set home button to load it
        self._home_page = tool_info["homepage"]
        self.home_button.clicked.connect(lambda: self.web_view.load(QtCore.QUrl(self._home_page)))

    def _reload_becomes_stop(self):
        """Turns the reload button into a stop button.
        """
        self._reload_stop_button.clicked.disconnect()
        self._reload_stop_button.clicked.connect(self.web_view.stop)
        self._reload_stop_button.setToolTip("Stop")
        self._reload_stop_button.setIcon(self._style.standardIcon(self._style.SP_BrowserStop))
        self._check_history()

    def _stop_becomes_reload(self, ok):
        """Turns a temporary stop button back into a reload button

        Args:
            ok (bool): Received from signal indicating load was stopped without error (True) or because of error (False).  Ignored.
        """
        self._reload_stop_button.clicked.disconnect()
        self._reload_stop_button.clicked.connect(self.web_view.reload)
        self._reload_stop_button.setToolTip("Reload")
        self._reload_stop_button.setIcon(self._style.standardIcon(self._style.SP_BrowserReload))
        self._check_history()

    def _check_history(self):
        if self.web_view.history().canGoBack():
            self.back_button.setEnabled(True)
        else:
            self.back_button.setEnabled(False)

        if self.web_view.history().canGoForward():
            self.forward_button.setEnabled(True)
        else:
            self.forward_button.setEnabled(False)

    def _cancel_manual_search(self):
        self.close()
        QtCore.QThread.currentThread().exit(1)

    def _cancel_manual_search_open_issue(self):
        self.close()
        webbrowser.open_new_tab("https://github.com/norweeg/portable-computing-toolkit-installer/issues/new")
        QtCore.QThread.currentThread().exit(1)

    def begin_manual_search(self):
        self.web_view.history().clear()
        self._check_history()
        self.show()
        self.web_view.load(QtCore.QUrl(self._home_page))

    def begin_auto_search(self):
        pass

    def _download_file(self):
        pass

class DownloadWorker(QtCore.QRunnable):
    def __init__(self, tool_name, tool_info, download_directory):
        super().__init__()
        self._downloader = Downloader(tool_name, tool_info, download_directory)

    def run(self):
        self._downloader.begin_auto_search()