# (C) Copyright 2005-2021 Enthought, Inc., Austin, TX
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in LICENSE.txt and may be redistributed only under
# the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
#
# Thanks for using Enthought open source!
# (C) Copyright 2007 Riverbank Computing Limited
# This software is provided without warranty under the terms of the BSD license.
# However, when used with the GPL version of PyQt the additional terms described in the PyQt GPL exception also apply


import os


from pyface.qt import QtCore, QtGui


from traits.api import Enum, Int, List, provides, Str


from pyface.i_file_dialog import IFileDialog, MFileDialog
from .dialog import Dialog


@provides(IFileDialog)
class FileDialog(MFileDialog, Dialog):
    """ The toolkit specific implementation of a FileDialog.  See the
    IFileDialog interface for the API documentation.
    """

    # 'IFileDialog' interface ---------------------------------------------#

    action = Enum("open", "open files", "save as")

    default_directory = Str()

    default_filename = Str()

    default_path = Str()

    directory = Str()

    filename = Str()

    path = Str()

    paths = List(Str)

    wildcard = Str()

    wildcard_index = Int(0)

    # ------------------------------------------------------------------------
    # 'MFileDialog' *CLASS* interface.
    # ------------------------------------------------------------------------

    # In Windows, Qt needs only a * while wx needs a *.*
    WILDCARD_ALL = "All files (*)|*"

    @classmethod
    def create_wildcard(cls, description, extension):
        """ Creates a wildcard for a given extension. """

        if isinstance(extension, str):
            pattern = extension

        else:
            pattern = " ".join(extension)

        return "%s (%s)|%s|" % (description, pattern, pattern)

    # ------------------------------------------------------------------------
    # Protected 'IDialog' interface.
    # ------------------------------------------------------------------------

    def _create_contents(self, parent):
        # In PyQt this is a canned dialog.
        pass

    # ------------------------------------------------------------------------
    # 'IWindow' interface.
    # ------------------------------------------------------------------------

    def close(self):
        # Get the path of the chosen directory.
        files = self.control.selectedFiles()

        if files:
            self.path = str(files[0])
            self.paths = [str(file) for file in files]
        else:
            self.path = ""
            self.paths = [""]

        # Extract the directory and filename.
        self.directory, self.filename = os.path.split(self.path)

        # Get the index of the selected filter.
        self.wildcard_index = self.control.nameFilters().index(
            self.control.selectedNameFilter()
        )

        # Let the window close as normal.
        super(FileDialog, self).close()

    # ------------------------------------------------------------------------
    # Protected 'IWidget' interface.
    # ------------------------------------------------------------------------

    def _create_control(self, parent):
        # If the caller provided a default path instead of a default directory
        # and filename, split the path into it directory and filename
        # components.
        if (
            len(self.default_path) != 0
            and len(self.default_directory) == 0
            and len(self.default_filename) == 0
        ):
            default_directory, default_filename = os.path.split(
                self.default_path
            )
        else:
            default_directory = self.default_directory
            default_filename = self.default_filename

        # Convert the filter.
        filters = []
        for filter_list in self.wildcard.split("|")[::2]:
            # Qt uses spaces instead of semicolons for extension separators
            filter_list = filter_list.replace(";", " ")
            filters.append(filter_list)

        # Set the default directory.
        if not default_directory:
            default_directory = QtCore.QDir.currentPath()

        dlg = QtGui.QFileDialog(parent, self.title, default_directory)
        dlg.setViewMode(QtGui.QFileDialog.Detail)
        dlg.selectFile(default_filename)
        dlg.setNameFilters(filters)

        if self.wildcard_index < len(filters):
            dlg.selectNameFilter(filters[self.wildcard_index])

        if self.action == "open":
            dlg.setAcceptMode(QtGui.QFileDialog.AcceptOpen)
            dlg.setFileMode(QtGui.QFileDialog.ExistingFile)
        elif self.action == "open files":
            dlg.setAcceptMode(QtGui.QFileDialog.AcceptOpen)
            dlg.setFileMode(QtGui.QFileDialog.ExistingFiles)
        else:
            dlg.setAcceptMode(QtGui.QFileDialog.AcceptSave)
            dlg.setFileMode(QtGui.QFileDialog.AnyFile)

        return dlg

    # ------------------------------------------------------------------------
    # Trait handlers.
    # ------------------------------------------------------------------------

    def _wildcard_default(self):
        """ Return the default wildcard. """

        return self.WILDCARD_ALL
