import sys
import platform
import traceback
import webbrowser

from PyQt5.QtCore import QT_VERSION_STR, PYQT_VERSION_STR, QCoreApplication
from PyQt5.QtWidgets import QDialog, QDialogButtonBox, QVBoxLayout, QLabel, QTextEdit

from UM.Logger import Logger
from UM.i18n import i18nCatalog
catalog = i18nCatalog("cura")

# List of exceptions that should be considered "fatal" and abort the program.
# These are primarily some exception types that we simply cannot really recover from
# (MemoryError and SystemError) and exceptions that indicate grave errors in the
# code that cause the Python interpreter to fail (SyntaxError, ImportError). 
fatal_exception_types = [
    MemoryError,
    SyntaxError,
    ImportError,
    SystemError,
]

def show(exception_type, value, tb):
    debug_mode = False
    if QCoreApplication.instance():
        debug_mode = QCoreApplication.instance().getCommandLineOption("debug-mode", False)

    Logger.log("c", "An uncaught exception has occurred!")
    for line in traceback.format_exception(exception_type, value, tb):
        for part in line.rstrip("\n").split("\n"):
            Logger.log("c", part)

    if not debug_mode and exception_type not in fatal_exception_types:
        return

    application = QCoreApplication.instance()
    if not application:
        sys.exit(1)

    dialog = QDialog()
    dialog.setWindowTitle(catalog.i18nc("@title:window", "Oops!"))

    layout = QVBoxLayout(dialog)

    label = QLabel(dialog)
    layout.addWidget(label)
    label.setText(catalog.i18nc("@label", "<p>A fatal exception has occurred that we could not recover from!</p><p>Please use the information below to post a bug report at <a href=\"http://github.com/Ultimaker/Cura/issues\">http://github.com/Ultimaker/Cura/issues</a></p>"))

    textarea = QTextEdit(dialog)
    layout.addWidget(textarea)

    try:
        from UM.Application import Application
        version = Application.getInstance().getVersion()
    except:
        version = "Unknown"

    trace = "".join(traceback.format_exception(exception_type, value, tb))

    crash_info = "Version: {0}\nPlatform: {1}\nQt: {2}\nPyQt: {3}\n\nException:\n{4}"
    crash_info = crash_info.format(version, platform.platform(), QT_VERSION_STR, PYQT_VERSION_STR, trace)

    textarea.setText(crash_info)

    buttons = QDialogButtonBox(QDialogButtonBox.Close, dialog)
    layout.addWidget(buttons)
    buttons.addButton(catalog.i18nc("@action:button", "Open Web Page"), QDialogButtonBox.HelpRole)
    buttons.rejected.connect(dialog.close)
    buttons.helpRequested.connect(lambda: webbrowser.open("http://github.com/Ultimaker/Cura/issues"))

    dialog.exec_()
    sys.exit(1)