#------------------------------------------------------------------------------
# Copyright (c) 2007, Riverbank Computing Limited
# All rights reserved.
#
# 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

#
# Author: Riverbank Computing Limited
# Description: <Enthought pyface package component>
#------------------------------------------------------------------------------


# Standard library imports.
import os

# Major package imports.
from pyface.qt import QtCore, QtGui

# Enthought library imports.
from traits.api import Enum, Int, List, provides, Unicode

# Local imports.
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 = Unicode

    default_filename = Unicode

    default_path = Unicode

    directory = Unicode

    filename = Unicode

    path = Unicode

    paths = List(Unicode)

    wildcard = Unicode

    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, basestring):
            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 = unicode(files[0])
            self.paths = [unicode(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

#### EOF ######################################################################
