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# Source code for tecplot.layout.page

    import logging

    from contextlib import contextmanager
    from fnmatch import fnmatch

    from ..tecutil import _tecutil
    from ..constant import *
    from ..exception import *
    from .. import macro, session
    from ..tecutil import Index, lock, lock_attributes, sv
    from .frame import Frame

    log = logging.getLogger(__name__)

    @lock_attributes
    class Page(object):
        """`Page` object within a layout, holding onto one or more `Frames <Frame>`.

        Parameters:
            uid (`integer <int>`, optional): This must be a *valid* unique ID
                number pointing internally to a `Page` object or `None`. A new
                `Page` is created if set to `None`. (default: `None`)

        Warning:
            Though it is possible to create a `Page` object using the
            constructor, it is usually sufficient to obtain a page through
            `tecplot.add_page`,  `tecplot.active_page`, `tecplot.page` or
            `tecplot.pages`.

        A `Page` can be thought of like a canvas onto which one or more
        `Frames <Frame>` can be laid out. The engine guarantees there will
        always be at least one `Page` in the layout which can be accessed
        via `tecplot.active_page`::

            >>> import tecplot
            >>> page = tecplot.active_page()
            >>> page
            Page(uid=1)
            >>> for frame in page.frames():
            ...   print(frame)
            Frame 001
        """
        def __init__(self, uid):
            self.uid = uid
            self.framelist = None
            """The unique ID number of this Page, internal to the |Tecplot Engine|."""
            self._sv = [sv.PAGE]

        def __str__(self):
            """Brief string representation.

            Returns:
                `string <str>`: Brief representation of this `Page`.

            Example::
                >>> import tecplot
                >>> page = tecplot.active_page()
                >>> print(page)
                Page: "Page 001"
            """
            return 'Page: "{name}"'.format(name=self.name)

        def __repr__(self):
            """Executable string representation.

            Returns:
                `string <str>`: Internal representation of this `Page`.

            The string returned can be executed to generate an identical
            copy of this `Page` object::

                >>> import tecplot
                >>> page = tecplot.active_page()
                >>> page_copy=None
                >>> print(repr(page))
                Page(uid=1)
                >>> exec('page_copy = '+repr(page))
                >>> page_copy
                Page(uid=11, page=Page(uid=1))

                >>> # page_copy is not technically a copy.
                >>> # it is the same object as the original page:
                >>> page == page_copy
                True
            """
            return 'Page(uid={uid})'.format(uid=self.uid)

        def __eq__(self, other):
            """Checks for `Page` equality in the |Tecplot Engine|.

            Returns:
                `bool`: `True` if the unique ID numbers are the same for both `Pages <Page>`.

            Example::

                >>> import tecplot
                >>> page1 = tecplot.active_page()
                >>> page2 = tecplot.add_page()
                >>> page1 == page2
                False
                >>> tecplot.active_page() == page2
                True
            """
            return self.uid == other.uid

        @lock()
        def __contains__(self, frame):
            with self.activated():
                result = False
                if _tecutil.FrameGetCount():
                    _tecutil.FrameLightweightLoopStart()
                    while True:
                        if frame.uid == _tecutil.FrameGetUniqueID():
                            result = True
                            break
                        if not _tecutil.FrameLightweightLoopNext():
                            break
                    _tecutil.FrameLightweightLoopEnd()
                return result

        def __getitem__(self, pattern):
            return self.frame(pattern)

        def __iter__(self):
            self.framelist = list(self.frames())
            return self

        def __next__(self):
            try:
                return self.framelist.pop(0)
            except (KeyError, IndexError):
                raise StopIteration

        def next(self):  # if sys.version_info < (3,)
            return self.__next__()

        @property
        def aux_data(self):
            """Auxiliary data for this page.

            Returns: `AuxData`

            This is the auxiliary data attached to the page. Such data is written
            to the layout file by default and can be retrieved later. Example
            usage::

                >>> aux = tp.active_page().aux_data
                >>> aux['Result'] = '3.14159'
                >>> print(aux['Result'])
                3.14159
            """
            return session.AuxData(self, AuxDataObjectType.Page)

        @property
        def position(self):
            """Returns the position of the Page

            :type: `Index`

            The page positions are 0 based positions relative to the current page,
            where the current page has a position value of 0, the next page 1,
            the page after that 2, and so on.
            """
            return Index(_tecutil.PageGetPosByUniqueID(self.uid) - 1)

        @property
        def name(self):
            """Returns or sets the name.

            :type: `string <str>`

            This is the name used when searching for `Page` objects in
            `tecplot.pages` and `tecplot.page`. It does not have to be unique.

            Example::

                >>> import tecplot
                >>> page = tecplot.active_page()
                >>> page.name = 'My Data'
                >>> print('this page:', page.name)
                this page: My Data
            """
            with self.activated():
                return _tecutil.PageGetName()[1]

        @name.setter
        @lock()
        def name(self, name):
            with self.activated():
                if not _tecutil.PageSetName(name):
                    raise TecplotSystemError()

        @property
        def paper(self):
            """The `Paper` defined in this `Page`.

            :type: `Paper`

            Every `Page` has the concept of a workspace which includes
            all `Frames <Frame>` as well as a sub-area of the workspace
            called the `Paper`. The limits of the `Paper` with respect to
            the placement of `Frames <Frame>` is used when exporting
            certain image formats.
            """
            return Paper(self)

        @property
        def active(self):
            """Checks if this `Page` is active.

            Returns:
                `bool`: `True` if active.
            """
            return self.uid == _tecutil.PageGetUniqueID()

        @lock()
        def activate(self):
            """Activates the `Page`.

            Raises:
                `TecplotRuntimeError`: Page does not exist.
                `TecplotSystemError`: Could not activate the page.
            """
            if not self.active:
                if not self.exists:
                    raise TecplotRuntimeError('page does not exists')
                elif not _tecutil.PageSetCurrentByUniqueID(self.uid):
                    raise TecplotSystemError('could not activate page')

        @contextmanager
        def activated(self):
            current_page = Page(_tecutil.PageGetUniqueID())
            if self == current_page:
                yield
            else:
                self.activate()
                try:
                    yield
                finally:
                    current_page.activate()

        def active_frame(self):
            """Returns the active `Frame`.

            Returns:
                `Frame`: The active `Frame`.

            This implicitly activates this `Page` and returns the active
            `Frame` attached to it.
            """
            self.activate()
            if _tecutil.FrameGetCount():
                return Frame(_tecutil.FrameGetActiveID(), self)

        @lock()
        def add_frame(self):
            """Creates a new `Frame` in this `Page`.

            Returns:
                `Frame`: The newly created and activated `Frame`.

            Raises:
                `TecplotRuntimeError`: Could not find active frame.
                `TecplotSystemError`: Could not create a new frame.

            This implicitly activates the `Page` and creates and activates
            a new `Frame`.
            """
            self.activate()
            if not _tecutil.FrameCreateNew(False, 0, 0, 0, 0):
                raise TecplotSystemError('could not create new frame')
            else:
                uid = _tecutil.FrameGetActiveID()
                if uid > 0:
                    return Frame(uid, self)
                else:
                    raise TecplotRuntimeError('could not get id of newly created active frame')

        @lock()
        def delete_frame(self, frame):
            """Removes the frame from this `Page`.

            Raises:
                `TecplotRuntimeError`: If `Frame` is not in this `Page`.
                `TecplotSystemError`: Could not delete the frame.
            """
            if frame not in self:
                raise TecplotRuntimeError('frame is not in this page')
            else:
                with frame.activated():
                    if not _tecutil.FrameDeleteActive():
                        raise TecplotSystemError()

        @lock()
        def frame(self, pattern):
            """Returns the `Frame` by name.

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

            Returns:
                `Frame`: The first `Frame` identified by *pattern*.

            .. note::
                A `Page` can contain `Frames <Frame>` 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 `Frames <Frame>` with unique names
                when this feature is used.

            Example:

                .. code-block:: python
                    :emphasize-lines: 4

                    >>> import tecplot
                    >>> page = tecplot.active_page()
                    >>> frameA = page.add_frame('A')
                    >>> frameB = page.add_frame('B')
                    >>> frameA == page.frame('A')
                    True
            """
            with self.activated():
                frame = None
                if _tecutil.FrameGetCount():
                    _tecutil.FrameLightweightLoopStart()
                    while True:
                        if fnmatch(_tecutil.FrameGetName()[1], pattern):
                            frame = Frame(_tecutil.FrameGetUniqueID(), self)
                            break
                        if not _tecutil.FrameLightweightLoopNext():
                            break
                    _tecutil.FrameLightweightLoopEnd()
                if frame is None:
                    raise TecplotPatternMatchError(
                        pattern,
                        'no frame found with name: "{}"'.format(pattern),
                        'glob')
                return frame

        @lock()
        def frames(self, pattern=None):
            """Returns a `list` of `Frames <Frame>` matching the specified pattern.

            Parameters:
                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`)

            Returns:
                `list`: `Frames <Frame>` identified by *pattern*.

            Example::

                >>> import tecplot
                >>> page = tecplot.active_page()

                >>> # iterate over all frames and print their names
                >>> for frame in page.frames():
                >>>     print(frame.name)
                Frame 001
                Frame 002
                >>> # store a persistent list of frames
                >>> frames = page.frames()
                >>> print([f.name for f in frames])
                ['Frame 001', 'Frame 002']
            """
            with self.activated():
                framelist = []
                if _tecutil.FrameGetCount():
                    _tecutil.FrameLightweightLoopStart()
                    try:
                        while True:
                            success, name = _tecutil.FrameGetName()
                            if success:
                                if pattern is None or fnmatch(name, pattern):
                                    framelist.append(Frame(_tecutil.FrameGetUniqueID(), self))
                            if not _tecutil.FrameLightweightLoopNext():
                                break
                    finally:
                        _tecutil.FrameLightweightLoopEnd()
                if not framelist and pattern is not None:
                    raise TecplotPatternMatchError(
                        pattern,
                        'no frames found with name: "{}"'.format(pattern),
                        'glob')
                return framelist

        @property
        @lock()
        def exists(self):
            """Checks if the `Page` exists in the current layout.

            This will return `False` after the `Page` has been deleted::
                >>> import tecplot as tp
                >>> page = tp.add_page()
                >>> page.exists
                True
                >>> tp.delete_page(page)
                >>> page.exists
                False
            """
            current_page = _tecutil.PageGetUniqueID()
            try:
                for _ in range(_tecutil.PageGetCount()):
                    _tecutil.PageSetCurrentToNext()
                    if self.uid == _tecutil.PageGetUniqueID():
                        return True
                return False
            finally:
                if current_page != _tecutil.PageGetUniqueID():
                    _tecutil.PageSetCurrentByUniqueID(current_page)

        @lock()
        def tile_frames(self, mode=TileMode.Grid):
            """Tile frames based on a certain mode.

            Parameters:
                mode (`TileMode`, optional): Direction and layout mode for tiling
                    frames. Possible values: `TileMode.Grid` (default),
                    `TileMode.Columns`, `TileMode.Rows`, `TileMode.Wrap`.

            Example usage::

                >>> from tecplot.constant import TileMode
                >>> page.tile_frame(TileMode.Wrap)
            """
            with self.activated():
                macro.execute_extended_command('Multi Frame Manager', mode.value)

    @lock_attributes
    class Paper(object):
        """The `Paper` boundary defined on a workspace.

        This is the area used for certain image output formats. It
        is defined for a specific `Page`. `Frames <Frame>` can be
        laid out in reference to this sub-area of the workspace.
        """
        def __init__(self, page):
            self.page = page
            self._sv = page._sv + [sv.PAPER]

        @property
        def dimensions(self):
            """Width and height.

            the dimensions, *(width, height)* in inches, of the
            currently defined paper in the Tecplot workspace.
            """
            with self.page.activated():
                return _tecutil.PaperGetDimensions()

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