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# Source code for tecplot.layout.layout

    from __future__ import division, print_function, absolute_import
    from six import string_types
    import logging

    from fnmatch import fnmatch
    from os import path

    from ..tecutil import _tecutil, ArgList, IndexSet, sv, lock
    from ..exception import *
    from .page import Page

    log = logging.getLogger(__name__)

    @lock()
    def new_layout():
        """Clears the current layout and creates a blank frame.

        This will invalidate any object instances previously obtained:

        .. code-block:: python
            :emphasize-lines: 2

            >>> import tecplot
            >>> frame = tecplot.active_frame()
            >>> tecplot.new_layout()
            >>> # frame is no longer usable:
            >>> try:
            ...   frame.plot_type
            ... except Exception as e:
            ...   print(type(e),e)
            ...
            <class 'ValueError'> 255 is not a valid PlotType
        """
        _tecutil.NewLayout()

    @lock()
    def load_layout(filename):
        """Reads a layout file and replaces the active frame.

        Parameters:
            filename (`string <str>`): The file name of the layout to be loaded.

        Raises:
            `TecplotOSError`: If file can not be found.
            `TecplotSystemError`: If the file could not be loaded.

        This will replace the current layout and therefore will invalidate any
        object instances previously obtained:

        .. code-block:: python
            :emphasize-lines: 2

            >>> import tecplot
            >>> frame = tecplot.active_frame()
            >>> tecplot.load_layout('analysis.lay')
            >>> # frame is no longer usable
        """
        if not path.exists(filename):
            raise TecplotOSError('can not find layout file: {0}'.format(filename))
        with ArgList(FNAME=path.abspath(filename)) as arglist:
            if not _tecutil.OpenLayoutX(arglist):
                raise TecplotSystemError()

    @lock()
    def save_layout(filename, include_data=None, include_preview=None,
                    use_relative_paths=None, post_layout_commands=None,
                    pages=None):
        """Writes the current layout to a file.

        Parameters:
            filename (`string <str>`): The path to the output filename. Relative
                to the current working directory.
            include_data (`boolean <bool>`, optional): Associated value indicates
                if the layout should be saved as a layout package where the data
                is included with the style information or if it should reference
                linked data. (default: `False`)
            include_preview (`boolean <bool>`, optional): Associated value
                indicates if the layout package should also include a preview
                image. This argument only applies if the include data option is
                True. (default: `True`)
            use_relative_paths (`boolean <bool>`, optional): Associated value
                indicates if the layout should be saved using relative paths.
                This argument only applies if the include data option is `False`.
                (default: `False`)
            post_layout_commands (`string <str>`, optional): A character string
                containing a set of Tecplot macro commands that are appended to
                the layout or layout package file. These can be almost anything
                and are generally used to store add-on specific state
                information using ``$!EXTENDEDCOMMAND`` commands. (default:
                `None`)
            pages (`list` of `Page` objects, optional): If `None`, all pages
                are written to the layout, otherwise the specified subset of pages
                are written. (default: `None`)

        Raises:
            `TecplotSystemError`

        .. note::
            If you receive an exception with the error message
            "Journal should be valid in all frames", then you must save a data file
            using `save_tecplot_ascii` or `save_tecplot_binary` before saving the
            layout.

        Example:
            In this example, we load an example layout file and then save it as a
            packaged layout file.

            .. code-block:: python
                :emphasize-lines: 7

                >>> import os
                >>> import tecplot
                >>> examples_dir = tecplot.session.tecplot_examples_directory()
                >>> infile = os.path.join(examples_dir, '3D', 'JetSurface.lay')
                >>> outfile = 'jet_surface.png'
                >>> tecplot.load_layout(infile)
                >>> tecplot.save_layout('output.lpk', include_data=True)
        """

        if __debug__:
            # for frame in frames():
            #     if frame.plot_type is PlotType.Sketch:
            #         log.warning(
            #             'Saving layout will ignore data attached to Frames that ' +
            #             'have plot-type "Sketch". Set the plot-type of the frames to ' +
            #             'Cartesian 3D for example to save the associated datasets.')

            if not isinstance(filename, string_types):
                raise TecplotTypeError('filename must be a string')

            for argument in [(include_data, 'include_data'),
                             (include_preview, 'include_preview'),
                             (use_relative_paths, 'use_relative_paths')]:
                if not isinstance(argument[0], (bool, type(None))):
                    raise TecplotTypeError('{} must be bool'.format(argument[1]))

            if not isinstance(post_layout_commands, (string_types, type(None))):
                raise TecplotTypeError('post_layout_commands must be a string')

            if not isinstance(pages, (list, type(None))):
                raise TecplotTypeError('pages must be a list of Page objects')

        with ArgList() as arglist:
            arglist[sv.FNAME] = filename

            for arg, svarg in [(include_data, sv.INCLUDEDATA),
                               (include_preview, sv.INCLUDEPREVIEW),
                               (use_relative_paths, sv.USERELATIVEPATHS),
                               (post_layout_commands, sv.POSTLAYOUTCOMMANDS)]:
                if arg is not None:
                    arglist[svarg] = arg

            if pages is not None:
                # noinspection PyProtectedMember
                arglist[sv.PAGELIST] = IndexSet(P.position for P in pages)

            if not _tecutil.SaveLayoutX(arglist):
                raise TecplotSystemError()

    def active_page():
        """Returns the currently active page.

        Returns:
            `Page`: The currently active page.

        Only one `Page` can be active at any given time. As long as the page is
        not deleted (through a call to `new_layout` or `load_layout` for
        example) this can be used to bring it back to the active state:

        .. code-block:: python
            :emphasize-lines: 1

            >>> import tecplot
            >>> page1 = tecplot.active_page()
            >>> page2 = tecplot.add_page()
            >>> # page2 is now active, but we can
            >>> # bring page1 back to the front:
            >>> page1.activate()
        """
        return Page(_tecutil.PageGetUniqueID())

    @lock()
    def add_page():
        """Adds a `Page` to the layout.

        Returns:
            `Page`: The newly created page.

        This will implicitly activate the newly created page:

        .. code-block:: python
            :emphasize-lines: 2

            >>> import tecplot
            >>> page1 = tecplot.active_page()
            >>> page2 = tecplot.add_page()
            >>> # page2 is now active
        """
        if _tecutil.PageCreateNew():
            return Page(_tecutil.PageGetUniqueID())
        else:
            raise TecplotSystemError('could not add-create-new page')

    @lock()
    def delete_page(page_to_delete):
        """Removes a `Page` from the layout.

        This will render any `Page` object pointing to the deleted `Page` useless.
        The unique ID will not be used again in the active session and it is up
        to the user to clear the python object using `del`::

            >>> import tecplot as tp
            >>> page = tp.add_page()
            >>> tp.delete_page(page)
            >>> next_page = tp.active_page()
            >>> page == next_page
            False
            >>> page.active
            False
            >>> page.activate()
            >>> del page # clear the python object
        """
        page_to_delete.activate()
        _tecutil.PageDelete()

    @lock()
    def next_page():
        """Activates and returns the next page.

        Returns:
            `layout.Page`: The next page in the layout.

        `Page` objects are stored in an ordered stack in the |Tecplot Engine|.
        This method rotates the stack and returns the resulting active `Page`:

        .. code-block:: python
            :emphasize-lines: 3

            >>> import tecplot
            >>> from tecplot.layout import next_page
            >>> page1 = tecplot.add_page()
            >>> page2 = tecplot.add_page()
            >>> next_page = next_page()
            >>> # page1 is now the active page
            >>> next_page == page1
            True
        """
        _tecutil.PageSetCurrentToNext()
        return active_page()

    def page(pattern):
        """Returns the page by name.

        Parameters:
            pattern (`string <str>`): `Glob-style <fnmatch.fnmatch>`  pattern.

        Returns:
            `Page`: The first page identified by *pattern*.

        .. note::
            A layout can contain pages with identical names. When the parameter
            *pattern* is a string, the first match found is returned. This is
            not guaranteed to be deterministic and care should be taken to have
            only pages with unique names when this feature is used.

        Example:

            .. code-block:: python
                :emphasize-lines: 5

                >>> import tecplot
                >>> page11 = tecplot.add_page()
                >>> page11.name = 'Page 11'
                >>> page12 = tecplot.add_page()
                >>> page12.name = 'Page 12'
                >>> page12 == tecplot.page('Page 1*')
                True
        """
        return next(pages(pattern), None)

    def pages(pattern=None):
        """Yields pages matching a specified pattern.

        Parameters:
            pattern (`string <str>`, optional):
                `Glob-style pattern <fnmatch.fnmatch>` used to match the names
                of the yielded `Page` objects. All pages are returned if no
                pattern is specified. (default: `None`)

        Yields:
            `Page`: Generator of pages identified by *pattern*.

        This function returns a generator which can only be iterated over once.
        It can be converted to a `list` for persistence::

            >>> import tecplot
            >>> # iterate over all pages and print their names
            >>> for page in tecplot.pages():
            >>>     print(page.name)
            >>> # store a persistent list of pages
            >>> pages = list(tecplot.pages())
        """
        for i in range(_tecutil.PageGetCount()):
            current_page = Page(_tecutil.PageGetUniqueID())
            if pattern is None or fnmatch(current_page.name, pattern):
                yield current_page
            next_page()

    def active_frame():
        """Returns the active frame.

        Returns:
            `Frame`: Currently active frame.
        """
        return active_page().active_frame()

    def frames(frame_pattern=None, page_pattern=None):
        """Returns a generator of frames matching the specified pattern.

        Parameters:
            frame_pattern (`string <str>`, optional):
                `Glob-style pattern <fnmatch.fnmatch>` used to match the names
                of the yielded `Frame` objects. All frames are returned if no
                pattern is specified. (default: `None`)
            page_pattern (`string <str>`, optional):
                `Glob-style pattern <fnmatch.fnmatch>` used to match the names
                of the yielded `Frame` objects. All frames are returned if no
                pattern is specified. (default: `None`)

        Yields:
            `Frame`: Generator of frames identified by name patterns.
        """
        for page in pages(page_pattern):
            for frame in page.frames(frame_pattern):
                yield frame

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