#!/usr/bin/env python

# Copyright (C) 2010-2012  Sam Bull

"""
Dialog window, creates a popup window.

"""

import pygame.mouse
from pygame.locals import *

from _locals import *
from base_widget import Simple

class Dialog(Simple):

    """
    Dialog Window

    If ``surf`` is not given, window will be large enough to fit the
    given widget.

    """

    _can_focus = True
    _modal = True
    _layered = True
    _settings_default = {"title": None, "widget": None, "col_bg": (240,240,240),
                         "col_border": (50,40,90)}

    _drag = _over = False

    def _config(self, **kwargs):
        """
          widget: Widget that should be displayed in the dialog window.
          title: ``str`` Text to display in the title bar.
          col_border: ``tuple`` (r,g,b) Window decoration colour.
          col_bg: ``tuple`` (r,g,b) Background colour.
          modal: ``bool`` ``True`` if window should be modal.
              Defaults to ``True``.

        """
        if "widget" in kwargs:
            self._settings["widget"] = kwargs["widget"]
            self._settings["widget"]._parent = self
            self._settings["widget"].pos = (2, 20)
            if not hasattr(self, "image"):
                r = self._settings["widget"].rect
                self._create_base_images((r.w + 4, r.h + 22))
        if "title" in kwargs:
            self._settings["title"] = kwargs["title"]
        if "col_border" in kwargs:
            self._settings["col_border"] = kwargs["col_border"]
        if "col_bg" in kwargs:
            self._settings["col_bg"] = kwargs["col_bg"]
        if "modal" in kwargs:
            self._modal = kwargs["modal"]

    def _draw(self, draw):
        # Draw window
        inner_rect = Rect((2,20), (self.rect.w-4,self.rect.h-22))
        self._images["image"].fill(self._settings["col_border"])
        self._images["image"].fill(self._settings["col_bg"], inner_rect)
        if self._settings["title"]:
            t = Simple(Font["widget"].render(
                self._settings["title"], True, Font.col), pos = (22,0))
            self._images["image"].blit(t.image, t.pos)
        # Close button
        self._close_off = Simple((16,16), parent=self)
        self._close_off.image.fill(self._settings["col_border"])
        draw.circle(self._close_off.image, (140,6,15), (8,8), 8)
        draw.line(self._close_off.image, (0,0,1), (5,5), (11,11), 3)
        draw.line(self._close_off.image, (0,0,1), (5,11), (11,5), 3)
        self._close_over = Simple((16,16), parent=self)
        self._close_over.image.fill(self._settings["col_border"])
        draw.circle(self._close_over.image, (234,14,50), (8,8), 8)
        draw.line(self._close_over.image, (0,0,1), (5,5), (11,11), 5)
        draw.line(self._close_over.image, (0,0,1), (5,11), (11,5), 5)
        self._close_off.pos = self._close_over.pos = (1,1)

        self.image = self._images["image"].copy()
        self.image.blit(self._close_off.image, self._close_off.pos)

    def update(self, time):
        """Update dialog window each frame."""
        r = self._close_off.rect_abs
        if not self._over and r.collidepoint(pygame.mouse.get_pos()):
            # Display over button
            self.image = self._images["image"].copy()
            self.image.blit(self._close_over.image, self._close_over.pos)
            self._over = True
        elif self._over and not r.collidepoint(pygame.mouse.get_pos()):
            # Display normal button
            self.image = self._images["image"].copy()
            self.image.blit(self._close_off.image, self._close_off.pos)
            self._over = False

        self._settings["widget"].update(time)
        self.image.blit(self._settings["widget"].image,
                        self._settings["widget"].pos)

    def _event(self, event):
        """Respond to events."""
        minus_pos = lambda p1, p2: (p1[0] - p2[0], p1[1] - p2[1])

        if event.type == MOUSEBUTTONDOWN and event.button == 1 and \
          self.rect.collidepoint(event.pos) and event.pos[1] < self.rect.y + 20:
            # Clicking title bar of window
            if self._close_off.rect_abs.collidepoint(event.pos):
                # Close button
                self.remove()
            else:
                # Initialise window drag
                self._offset = minus_pos(event.pos, self.pos)
                self._drag = True
        elif event.type == MOUSEMOTION and self._drag:
            # Move window
            self.pos = minus_pos(event.pos, self._offset)
        elif event.type == MOUSEBUTTONUP and event.button == 1 and self._drag:
            # Stop moving window
            self.pos = minus_pos(event.pos, self._offset)
            self._drag = False
        else:
            self._settings["widget"]._event(event)