# -*- coding:utf-8 -*-
## src/message_textview.py
##
## Copyright (C) 2003-2007 Yann Leboulanger <asterix AT lagaule.org>
## Copyright (C) 2005-2007 Nikos Kouremenos <kourem AT gmail.com>
## Copyright (C) 2006 Dimitur Kirov <dkirov AT gmail.com>
##
## This file is part of Gajim.
##
## Gajim is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published
## by the Free Software Foundation; version 3 only.
##
## Gajim 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 General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Gajim. If not, see <http://www.gnu.org/licenses/>.
##

import gtk
import gobject
import pango
import gtkgui_helpers
from common import gajim

class MessageTextView(gtk.TextView):
	'''Class for the message textview (where user writes new messages)
	for chat/groupchat windows'''
	__gsignals__ = dict(
		mykeypress = (gobject.SIGNAL_RUN_LAST | gobject.SIGNAL_ACTION,
				None, # return value
				(int, gtk.gdk.ModifierType ) # arguments
			)
		)

	def __init__(self):
		gtk.TextView.__init__(self)

		# set properties
		self.set_border_width(1)
		self.set_accepts_tab(True)
		self.set_editable(True)
		self.set_cursor_visible(True)
		self.set_wrap_mode(gtk.WRAP_WORD_CHAR)
		self.set_left_margin(2)
		self.set_right_margin(2)
		self.set_pixels_above_lines(2)
		self.set_pixels_below_lines(2)

		self.lang = None # Lang used for spell checking
		buffer = self.get_buffer()
		self.begin_tags = {}
		self.end_tags = {}
		self.color_tags = []
		self.fonts_tags = []
		self.other_tags = {}
		self.other_tags['bold'] = buffer.create_tag('bold')
		self.other_tags['bold'].set_property('weight', pango.WEIGHT_BOLD)
		self.begin_tags['bold'] = '<strong>'
		self.end_tags['bold'] = '</strong>'
		self.other_tags['italic'] = buffer.create_tag('italic')
		self.other_tags['italic'].set_property('style', pango.STYLE_ITALIC)
		self.begin_tags['italic'] = '<em>'
		self.end_tags['italic'] = '</em>'
		self.other_tags['underline'] = buffer.create_tag('underline')
		self.other_tags['underline'].set_property('underline', pango.UNDERLINE_SINGLE)
		self.begin_tags['underline'] = '<span style="text-decoration: underline;">'
		self.end_tags['underline'] = '</span>'
		self.other_tags['strike'] = buffer.create_tag('strike')
		self.other_tags['strike'].set_property('strikethrough', True)
		self.begin_tags['strike'] = '<span style="text-decoration: line-through;">'
		self.end_tags['strike'] = '</span>'

	def make_clickable_urls(self, text):
		buffer = self.get_buffer()

		start = 0
		end = 0
		index = 0

		new_text = ''
		iterator = gajim.interface.link_pattern_re.finditer(text)
		for match in iterator:
			start, end = match.span()
			url = text[start:end]
			if start != 0:
				text_before_special_text = text[index:start]
			else:
				text_before_special_text = ''
			end_iter = buffer.get_end_iter()
			# we insert normal text
			new_text += text_before_special_text + \
			'<a href="'+ url +'">' + url + '</a>'

			index = end # update index

		if end < len(text):
			new_text += text[end:]

		return new_text # the position after *last* special text

	def get_active_tags(self):
		buffer = self.get_buffer()
		return_val = buffer.get_selection_bounds()
		if return_val: # if sth was selected
			start, finish = return_val[0], return_val[1]
		else:
			start, finish = buffer.get_bounds()
		active_tags = []
		for tag in start.get_tags():
			active_tags.append(tag.get_property('name'))
		return 	active_tags

	def set_tag(self, widget, tag):
		buffer = self.get_buffer()
		return_val = buffer.get_selection_bounds()
		if return_val: # if sth was selected
			start, finish = return_val[0], return_val[1]
		else:
			start, finish = buffer.get_bounds()
		if start.has_tag(self.other_tags[tag]):
			buffer.remove_tag_by_name(tag, start, finish)
		else:
			if tag == 'underline':
				buffer.remove_tag_by_name('strike', start, finish)
			elif tag == 'strike':
				buffer.remove_tag_by_name('underline', start, finish)
			buffer.apply_tag_by_name(tag, start, finish)

	def clear_tags(self, widget):
		buffer = self.get_buffer()
		return_val = buffer.get_selection_bounds()
		if return_val: # if sth was selected
			start, finish = return_val[0], return_val[1]
		else:
			start, finish = buffer.get_bounds()
		buffer.remove_all_tags(start, finish)

	def color_set(self, widget, response, color):
		if response == -6:
			widget.destroy()
			return
		buffer = self.get_buffer()
		color = color.get_current_color()
		widget.destroy()
		color_string = gtkgui_helpers.make_color_string(color)
		tag_name = 'color' + color_string
		if not tag_name in self.color_tags:
			tagColor = buffer.create_tag(tag_name)
			tagColor.set_property('foreground', color_string)
			self.begin_tags[tag_name] = '<span style="color: ' + color_string + ';">'
			self.end_tags[tag_name] = '</span>'
			self.color_tags.append(tag_name)

		return_val = buffer.get_selection_bounds()
		if return_val: # if sth was selected
			start, finish = return_val[0], return_val[1]
		else:
			start, finish = buffer.get_bounds()

		for tag in self.color_tags:
			buffer.remove_tag_by_name(tag, start, finish)

		buffer.apply_tag_by_name(tag_name, start, finish)

	def font_set(self, widget, response, font):
		if response == -6:
			widget.destroy()
			return

		buffer = self.get_buffer()

		font = font.get_font_name()
		font_desc = pango.FontDescription(font)
		family = font_desc.get_family()
		size = font_desc.get_size()
		size = size / pango.SCALE
		weight = font_desc.get_weight()
		style = font_desc.get_style()

		widget.destroy()

		tag_name = 'font' + font
		if not tag_name in self.fonts_tags:
			tagFont = buffer.create_tag(tag_name)
			tagFont.set_property('font', family + ' ' + str(size))
			self.begin_tags[tag_name] = \
				'<span style="font-family: ' + family + '; ' + \
				'font-size: ' + str(size) + 'px">'
			self.end_tags[tag_name] = '</span>'
			self.fonts_tags.append(tag_name)

		return_val = buffer.get_selection_bounds()
		if return_val: # if sth was selected
			start, finish = return_val[0], return_val[1]
		else:
			start, finish = buffer.get_bounds()

		for tag in self.fonts_tags:
			buffer.remove_tag_by_name(tag, start, finish)

		buffer.apply_tag_by_name(tag_name, start, finish)

		if weight == pango.WEIGHT_BOLD:
			buffer.apply_tag_by_name('bold', start, finish)
		else:
			buffer.remove_tag_by_name('bold', start, finish)

		if style == pango.STYLE_ITALIC:
			buffer.apply_tag_by_name('italic', start, finish)
		else:
			buffer.remove_tag_by_name('italic', start, finish)

	def get_xhtml(self):
		buffer = self.get_buffer()
		old = buffer.get_start_iter()
		tags = {}
		tags['bold'] = False
		iter = buffer.get_start_iter()
		old = buffer.get_start_iter()
		text = ''
		modified = False

		def xhtml_special(text):
			text = text.replace('<', '&lt;')
			text = text.replace('>', '&gt;')
			text = text.replace('\n', '<br />')
			return text

		for tag in iter.get_toggled_tags(True):
			tag_name = tag.get_property('name')
			if tag_name not in self.begin_tags:
				continue
			text += self.begin_tags[tag_name]
			modified = True
		while (iter.forward_to_tag_toggle(None) and not iter.is_end()):
			text += xhtml_special(buffer.get_text(old, iter))
			old.forward_to_tag_toggle(None)
			new_tags, old_tags, end_tags = [], [], []
			for tag in iter.get_toggled_tags(True):
				tag_name = tag.get_property('name')
				if tag_name not in self.begin_tags:
					continue
				new_tags.append(tag_name)
				modified = True

			for tag in iter.get_tags():
				tag_name = tag.get_property('name')
				if tag_name not in self.begin_tags or tag_name not in self.end_tags:
					continue
				if tag_name not in new_tags:
					old_tags.append(tag_name)

			for tag in iter.get_toggled_tags(False):
				tag_name = tag.get_property('name')
				if tag_name not in self.end_tags:
					continue
				end_tags.append(tag_name)

			for tag in old_tags:
				text += self.end_tags[tag]
			for tag in end_tags:
				text += self.end_tags[tag]
			for tag in new_tags:
				text += self.begin_tags[tag]
			for tag in old_tags:
				text += self.begin_tags[tag]

		text += xhtml_special(buffer.get_text(old, buffer.get_end_iter()))
		for tag in iter.get_toggled_tags(False):
			tag_name = tag.get_property('name')
			if tag_name not in self.end_tags:
				continue
			text += self.end_tags[tag_name]

		if modified:
			return '<p>' + self.make_clickable_urls(text) + '</p>'
		else:
			return None


	def destroy(self):
		import gc
		gobject.idle_add(lambda:gc.collect())

	def clear(self, widget = None):
		'''clear text in the textview'''
		buffer_ = self.get_buffer()
		start, end = buffer_.get_bounds()
		buffer_.delete(start, end)


# We register depending on keysym and modifier some bindings
# but we also pass those as param so we can construct fake Event
# Here we register bindings for those combinations that there is NO DEFAULT
# action to be done by gtk TextView. In such case we should not add a binding
# as the default action comes first and our bindings is useless. In that case
# we catch and do stuff before default action in normal key_press_event
# and we also return True there to stop the default action from running

# CTRL + SHIFT + TAB
gtk.binding_entry_add_signal(MessageTextView, gtk.keysyms.ISO_Left_Tab,
	gtk.gdk.CONTROL_MASK, 'mykeypress', int, gtk.keysyms.ISO_Left_Tab,
	gtk.gdk.ModifierType, gtk.gdk.CONTROL_MASK)

# CTRL + TAB
gtk.binding_entry_add_signal(MessageTextView, gtk.keysyms.Tab,
	gtk.gdk.CONTROL_MASK, 'mykeypress', int, gtk.keysyms.Tab,
	gtk.gdk.ModifierType, gtk.gdk.CONTROL_MASK)

# TAB
gtk.binding_entry_add_signal(MessageTextView, gtk.keysyms.Tab,
	0, 'mykeypress', int, gtk.keysyms.Tab,	gtk.gdk.ModifierType, 0)

# CTRL + UP
gtk.binding_entry_add_signal(MessageTextView, gtk.keysyms.Up,
	gtk.gdk.CONTROL_MASK, 'mykeypress', int, gtk.keysyms.Up,
	gtk.gdk.ModifierType, gtk.gdk.CONTROL_MASK)

# CTRL + DOWN
gtk.binding_entry_add_signal(MessageTextView, gtk.keysyms.Down,
	gtk.gdk.CONTROL_MASK, 'mykeypress', int, gtk.keysyms.Down,
	gtk.gdk.ModifierType, gtk.gdk.CONTROL_MASK)

# ENTER
gtk.binding_entry_add_signal(MessageTextView, gtk.keysyms.Return,
	0, 'mykeypress', int, gtk.keysyms.Return,
	gtk.gdk.ModifierType, 0)

# Ctrl + Enter
gtk.binding_entry_add_signal(MessageTextView, gtk.keysyms.Return,
	gtk.gdk.CONTROL_MASK, 'mykeypress', int, gtk.keysyms.Return,
	gtk.gdk.ModifierType, gtk.gdk.CONTROL_MASK)

# Keypad Enter
gtk.binding_entry_add_signal(MessageTextView, gtk.keysyms.KP_Enter,
	0, 'mykeypress', int, gtk.keysyms.KP_Enter,
	gtk.gdk.ModifierType, 0)

# Ctrl + Keypad Enter
gtk.binding_entry_add_signal(MessageTextView, gtk.keysyms.KP_Enter,
	gtk.gdk.CONTROL_MASK, 'mykeypress', int, gtk.keysyms.KP_Enter,
	gtk.gdk.ModifierType, gtk.gdk.CONTROL_MASK)

# vim: se ts=3: