from tuikit.core.buffer import Buffer

from tuikit.core.signal import Signal

from tuikit.core.container import Container

from tuikit.core.coords import Point

class Window(Container):

    """Window is rectangular part of screen containing widgets.

    Widgets are drawn into window, events are routed to widgets through window.

    """

    def __init__(self, buffer=None):

        """New buffer for the window will be created unless given existing

        `buffer` as parameter."""

        Container.__init__(self)

        self.pos = Point()

        self._buffer = None

        self.sig_resized = Signal()

        self.buffer = buffer or Buffer()

    @property

    def x(self):

        return self.pos.x

    @property

    def y(self):

        return self.pos.y

    @property

    def buffer(self):

        return self._buffer

    @buffer.setter

    def buffer(self, buffer):

        # disconnect signals from old buffer

        if self._buffer:

            self.sig_resized.disconnect(self._buffer.resize)

        # replace the buffer

        self._buffer = buffer

        # resize buffer when window gets resized

        self.sig_resized.connect(buffer.resize)

    @property

    def size(self):

        return self.buffer.size.readonly()

    def resize(self, w, h):

        self.buffer.resize(w, h)

        self.sig_resized(w, h)

        self.redraw()

    def redraw(self):

        Container.draw(self, self.buffer)

        self.buffer.puts(10, 5, '{0.w} {0.h}'.format(self.size))

        self.buffer.frame()

    def draw(self, buffer, x=0, y=0):

        """Draw this window into `buffer` at x/y coords."""

        buffer.draw(self.buffer, x, y)

class WindowManager:

        self.windows = []

    def add(self, window):

        self.windows.append(window)

    def resize(self, w, h):

        self.windows[0].resize(w, h)

    def draw(self, buffer, x=0, y=0):

        for window in self.windows:

            window.draw(buffer,

                        x + window.x,

                        y + window.y)

    def handle_event(self, event_name, *args):

        """Handle input event to managed windows."""

        handler = getattr(self, event_name, None)

        if handler:

            handler(*args)

        else:

            raise Exception('Unknown event: %r %r' % (event_name, args))