# Copyright (C) 2006-2007 Red Hat, Inc.
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the
# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.

import os
import re
import time
import logging

import gobject
import gtk
import hippo
import rsvg
import cairo

from sugar.graphics.style import Color
from sugar.graphics.xocolor import XoColor
from sugar.graphics import style
from sugar.graphics.palette import Palette, CanvasInvoker

_BADGE_SIZE = 0.45

_svg_loader = None

def _get_svg_loader():
    global _svg_loader
    if _svg_loader == None:
        _svg_loader = _SVGLoader()
    return _svg_loader

class _SVGIcon(object):
    def __init__(self, data):
        self.data = data
        self.data_size = len(data)
        self.last_used = time.time()

class _SVGLoader(object):
    CACHE_MAX_SIZE = 50000
    CACHE_MAX_ICON_SIZE = 5000

    def __init__(self):
        self._cache = {}
        self._cache_size = 0

    def load(self, file_name, entities):
        icon = self._get_icon(file_name)

        for entity, value in entities.items():
            xml = '<!ENTITY %s "%s">' % (entity, value)
            icon.data = re.sub('<!ENTITY %s .*>' % entity, xml, icon.data)

        return rsvg.Handle(data=icon.data)

    def _get_icon(self, file_name):
        if self._cache.has_key(file_name):
            data = self._cache[file_name]
            data.last_used = time.time()
            return data

        icon_file = open(file_name, 'r')
        icon = _SVGIcon(icon_file.read())
        icon_file.close()

        self._cache[file_name] = icon
        self._cleanup_cache()

        return icon

    def _cleanup_cache(self):
        now = time.time()
        while self._cache_size > self.CACHE_MAX_SIZE:
            evict_key = None
            oldest_key = None
            oldest_time = now

            for icon_key, icon in self._cache.items():
                # evict large icons first
                if icon.data_size > self.CACHE_MAX_ICON_SIZE:
                    evict_key = icon_key
                    break

                # evict older icons next; those used over 2 minutes ago
                if icon.last_used < now - 120:
                    evict_key = icon_key
                    break

                # otherwise, evict the oldest
                if oldest_time > icon.last_used:
                    oldest_time = icon.last_used
                    oldest_key = icon_key

            # If there's nothing specific to evict, try evicting
            # the oldest thing
            if not evict_key:
                if not oldest_key:
                    break
                evict_key = oldest_key

            self._cache_size -= self._cache[evict_key].data_size
            del self._cache[evict_key]

class _IconInfo(object):
    def __init__(self):
        self.file_name = None
        self.attach_x = 0
        self.attach_y = 0

class _BadgeInfo(object):
    def __init__(self):
        self.attach_x = 0
        self.attach_y = 0
        self.size = 0
        self.icon_padding = 0

class _IconBuffer(object):
    def __init__(self):
        self._svg_loader = _get_svg_loader()
        self._surface_cache = {}
        self._cache_size = 1

        self.icon_name = None
        self.file_name = None
        self.fill_color = None
        self.stroke_color = None
        self.badge_name = None
        self.width = None
        self.height = None

    def _get_cache_key(self):
        return (self.icon_name, self.file_name, self.fill_color,
                self.stroke_color, self.badge_name, self.width, self.height)

    def _load_svg(self, file_name):
        entities = {}
        if self.fill_color:
            entities['fill_color'] = self.fill_color
        if self.stroke_color:
            entities['stroke_color'] = self.stroke_color

        return self._svg_loader.load(file_name, entities)

    def _get_attach_points(self, info, size_request):
        attach_points = info.get_attach_points()

        if attach_points:
            attach_x = float(attach_points[0][0]) / size_request
            attach_y = float(attach_points[0][1]) / size_request
        else:
            attach_x = attach_y = 0

        return attach_x, attach_y

    def _get_icon_info(self):
        icon_info = _IconInfo()

        if self.file_name:
            icon_info.file_name = self.file_name
        elif self.icon_name:
            theme = gtk.icon_theme_get_default()

            size = 50
            if self.width != None:
                size = self.width

            info = theme.lookup_icon(self.icon_name, size, 0)
            if info:
                attach_x, attach_y = self._get_attach_points(info, size)

                icon_info.file_name = info.get_filename()
                icon_info.attach_x = attach_x
                icon_info.attach_y = attach_y
            else:
                logging.warning('No icon with the name %s was found in the theme.' % self.icon_name)

        return icon_info

    def _draw_badge(self, context, size):
        theme = gtk.icon_theme_get_default()
        badge_info = theme.lookup_icon(self.badge_name, size, 0)
        if badge_info:
            badge_file_name = badge_info.get_filename()
            if badge_file_name.endswith('.svg'):
                handle = self._svg_loader.load(badge_file_name, {})
                handle.render_cairo(context)
            else:
                pixbuf = gtk.gdk.pixbuf_new_from_file(badge_file_name)
                surface = hippo.cairo_surface_from_gdk_pixbuf(pixbuf)
                context.set_source_surface(surface, 0, 0)
                context.paint()

    def _get_size(self, icon_width, icon_height):
        if self.width is not None and self.height is not None:
            width = self.width
            height = self.height
        else:
            width = icon_width
            height = icon_height

        return width, height

    def _get_badge_info(self, icon_info, icon_width, icon_height):
        info = _BadgeInfo()
        if self.badge_name is None:
            return info

        info.size = int(_BADGE_SIZE * icon_width)
        info.attach_x = int(icon_info.attach_x * icon_width - info.size / 2)
        info.attach_y = int(icon_info.attach_y * icon_height - info.size / 2)

        if info.attach_x < 0 or info.attach_y < 0:
            info.icon_padding = max(-info.attach_x, -info.attach_y)
        elif info.attach_x + info.size > icon_width or \
             info.attach_y + info.size > icon_height:
            x_padding = info.attach_x + info.size - icon_width
            y_padding = info.attach_y + info.size - icon_height
            info.icon_padding = max(x_padding, y_padding)

        return info

    def get_surface(self):
        cache_key = self._get_cache_key()
        if self._surface_cache.has_key(cache_key):
            return self._surface_cache[cache_key]

        icon_info = self._get_icon_info()
        if icon_info.file_name is None:
            return None

        is_svg = icon_info.file_name.endswith('.svg')

        if is_svg:
            handle = self._load_svg(icon_info.file_name)
            dimensions = handle.get_dimension_data()
            icon_width = int(dimensions[0])
            icon_height = int(dimensions[1])
        else:
            pixbuf = gtk.gdk.pixbuf_new_from_file(icon_info.file_name)
            icon_width = pixbuf.get_width()
            icon_height = pixbuf.get_height()

        badge_info = self._get_badge_info(icon_info, icon_width, icon_height)

        width, height = self._get_size(icon_width, icon_height)
        surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, width, height)

        context = cairo.Context(surface)
        padding = badge_info.icon_padding
        context.scale(float(width) / (icon_width + padding * 2),
                      float(height) / (icon_height + padding * 2))
        context.save()

        context.translate(padding, padding)
        if is_svg:
            handle.render_cairo(context)
        else:
            pixbuf_surface = hippo.cairo_surface_from_gdk_pixbuf(pixbuf)
            context.set_source_surface(pixbuf_surface, 0, 0)
            context.paint()

        if self.badge_name:
            context.restore()
            context.translate(badge_info.attach_x, badge_info.attach_y)
            self._draw_badge(context, badge_info.size)

        if (len(self._surface_cache) == self._cache_size):
            self._surface_cache.popitem()
        self._surface_cache[cache_key] = surface

        return surface

    def get_cache_size(self):
        return self._cache_size

    def set_cache_size(self, cache_size):
        while len(self._surface_cache) > cache_size:
            self._surface_cache.popitem()
        self._cache_size = cache_size

    cache_size = property(get_cache_size, set_cache_size)

class Icon(gtk.Image):
    __gtype_name__ = 'SugarIcon'

    __gproperties__ = {
        'xo-color'      : (object, None, None,
                           gobject.PARAM_WRITABLE),
        'fill-color'    : (object, None, None,
                           gobject.PARAM_READWRITE),
        'stroke-color'  : (object, None, None,
                           gobject.PARAM_READWRITE),
        'badge-name'    : (str, None, None, None,
                           gobject.PARAM_READWRITE)
    }

    def __init__(self, **kwargs):
        self._buffer = _IconBuffer()

        gobject.GObject.__init__(self, **kwargs)

    def _sync_image_properties(self):
        if self._buffer.icon_name != self.props.icon_name:
            self._buffer.icon_name = self.props.icon_name

        if self._buffer.file_name != self.props.file:
            self._buffer.file_name = self.props.file

        width, height = gtk.icon_size_lookup(self.props.icon_size)
        if self._buffer.width != width and self._buffer.height != height:
            self._buffer.width = width
            self._buffer.height = height

    def _icon_size_changed_cb(self, image, pspec):
        self._buffer.icon_size = self.props.icon_size

    def _icon_name_changed_cb(self, image, pspec):
        self._buffer.icon_name = self.props.icon_name

    def _file_changed_cb(self, image, pspec):
        self._buffer.file_name = self.props.file

    def _update_buffer_size(self):
        width, height = gtk.icon_size_lookup(self.props.icon_size)

        self._buffer.width = width
        self._buffer.height = height

    def do_expose_event(self, event):
        self._sync_image_properties()

        surface = self._buffer.get_surface()
        if surface is not None:
            cr = self.window.cairo_create()

            x = self.allocation.x
            y = self.allocation.y

            cr.set_source_surface(surface, x, y)
            cr.paint()

    def do_set_property(self, pspec, value):
        if pspec.name == 'xo-color':
            self.props.fill_color = value.get_fill_color()
            self.props.stroke_color = value.get_stroke_color()
        elif pspec.name == 'fill-color':
            self._buffer.fill_color = value
        elif pspec.name == 'stroke-color':
            self._buffer.stroke_color = value
        elif pspec.name == 'badge-name':
            self._buffer.badge_name = value
        else:
            gtk.Image.do_set_property(self, pspec, value)

    def do_get_property(self, pspec):
        if pspec.name == 'fill-color':
            return self._buffer.fill_color
        elif pspec.name == 'stroke-color':
            return self._buffer.stroke_color
        elif pspec.name == 'badge-name':
            return self._buffer.badge_name
        else:
            return gtk.Image.do_get_property(self, pspec)

class CanvasIcon(hippo.CanvasBox, hippo.CanvasItem):
    __gtype_name__ = 'CanvasIcon'

    __gproperties__ = {
        'file-name'     : (str, None, None, None,
                           gobject.PARAM_READWRITE),
        'icon-name'     : (str, None, None, None,
                           gobject.PARAM_READWRITE),
        'xo-color'      : (object, None, None,
                           gobject.PARAM_WRITABLE),
        'fill-color'    : (object, None, None,
                           gobject.PARAM_READWRITE),
        'stroke-color'  : (object, None, None,
                           gobject.PARAM_READWRITE),
        'size'          : (int, None, None, 0, 1024, 0,
                           gobject.PARAM_READWRITE),
        'scale'         : (float, None, None, -1024.0, 1024.0, 1.0,
                           gobject.PARAM_READWRITE),
        'cache-size'    : (int, None, None, 0, 1024, 0,
                           gobject.PARAM_READWRITE),
        'badge-name'    : (str, None, None, None,
                           gobject.PARAM_READWRITE)
    }

    def __init__(self, **kwargs):
        self._buffer = _IconBuffer()

        hippo.CanvasBox.__init__(self, **kwargs)

        self._palette = None

    def do_set_property(self, pspec, value):
        if pspec.name == 'file-name':
            self._buffer.file_name = value
            self.emit_paint_needed(0, 0, -1, -1)
        elif pspec.name == 'icon-name':
            self._buffer.icon_name = value
            self.emit_paint_needed(0, 0, -1, -1)
        elif pspec.name == 'xo-color':
            self.props.fill_color = value.get_fill_color()
            self.props.stroke_color = value.get_stroke_color()
        elif pspec.name == 'fill-color':
            if not isinstance(value, basestring) and value is not None:
                raise TypeError('fill-color must be a string, not %r' % type(value))
            self._buffer.fill_color = value
            self.emit_paint_needed(0, 0, -1, -1)
        elif pspec.name == 'stroke-color':
            if not isinstance(value, basestring) and value is not None:
                raise TypeError('stroke-color must be a string, not %r' % type(value))
            self._buffer.stroke_color = value
            self.emit_paint_needed(0, 0, -1, -1)
        elif pspec.name == 'size':
            self._buffer.width = value
            self._buffer.height = value
            self.emit_request_changed()
        elif pspec.name == 'scale':
            self._buffer.scale = value
            self.emit_request_changed()
        elif pspec.name == 'cache-size':
            self._buffer.cache_size = value
        elif pspec.name == 'badge-name':
            self._buffer.badge_name = value
            self.emit_paint_needed(0, 0, -1, -1)

    def do_get_property(self, pspec):
        if pspec.name == 'size':
            return self._buffer.width
        elif pspec.name == 'file-name':
            return self._buffer.file_name
        elif pspec.name == 'icon-name':
            return self._buffer.icon_name
        elif pspec.name == 'fill-color':
            return self._buffer.fill_color
        elif pspec.name == 'stroke-color':
            return self._buffer.stroke_color
        elif pspec.name == 'cache-size':
            return self._buffer.cache_size
        elif pspec.name == 'badge-name':
            return self._buffer.badge_name
        elif pspec.name == 'scale':
            return self._buffer.scale

    def do_paint_below_children(self, cr, damaged_box):
        surface = self._buffer.get_surface()
        if surface:
            width, height = self.get_allocation()

            x = (width - surface.get_width()) / 2
            y = (height - surface.get_height()) / 2

            cr.set_source_surface(surface, x, y)
            cr.paint()

    def do_get_content_width_request(self):
        surface = self._buffer.get_surface()
        if surface:
            size = surface.get_width()
        elif self._buffer.width:
            size = self._buffer.width
        else:
            size = 0

        return size, size

    def do_get_content_height_request(self, for_width):
        surface = self._buffer.get_surface()
        if surface:
            size = surface.get_height()
        elif self._buffer.height:
            size = self._buffer.height
        else:
            size = 0

        return size, size

    def do_button_press_event(self, event):
        self.emit_activated()
        return True

    def get_palette(self):
        return self._palette
    
    def set_palette(self, palette):
        self._palette = palette
        if not self._palette.props.invoker:
            self._palette.props.invoker = CanvasInvoker(self)

    def set_tooltip(self, text):
        self.set_palette(Palette(text))
    
    palette = property(get_palette, set_palette)

def get_icon_state(base_name, perc):
        step = 5
        strength = round(perc / step) * step
        icon_theme = gtk.icon_theme_get_default()

        while strength <= 100:
            icon_name = '%s-%03d' % (base_name, strength)
            if icon_theme.has_icon(icon_name):
                return icon_name

            strength = strength + step