/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * Copyright (C) 2002-2007 Imendio AB
 * Copyright (C) 2008 Collabora Ltd.
 *
 * This program 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; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program 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 this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 * 
 * Authors: Mikael Hallendal <micke@imendio.com>
 *          Richard Hult <richard@imendio.com>
 *          Martyn Russell <martyn@imendio.com>
 *          Xavier Claessens <xclaesse@gmail.com>
 */

#include "config.h"

#include <sys/types.h>
#include <string.h>
#include <time.h>

#include <glib/gi18n-lib.h>
#include <gtk/gtk.h>

#include <telepathy-glib/util.h>
#include <libmissioncontrol/mc-account.h>

#include <libempathy/empathy-utils.h>

#include "empathy-chat-text-view.h"
#include "empathy-chat.h"
#include "empathy-conf.h"
#include "empathy-ui-utils.h"
#include "empathy-smiley-manager.h"

#define DEBUG_FLAG EMPATHY_DEBUG_CHAT
#include <libempathy/empathy-debug.h>

/* Number of seconds between timestamps when using normal mode, 5 minutes. */
#define TIMESTAMP_INTERVAL 300

#define MAX_LINES 800
#define MAX_SCROLL_TIME 0.4 /* seconds */
#define SCROLL_DELAY 33     /* milliseconds */

#define GET_PRIV(obj) EMPATHY_GET_PRIV (obj, EmpathyChatTextView)

typedef struct {
	GtkTextBuffer        *buffer;
	guint                 scroll_timeout;
	GTimer               *scroll_time;
	GtkTextMark          *find_mark_previous;
	GtkTextMark          *find_mark_next;
	gboolean              find_wrapped;
	gboolean              find_last_direction;
	EmpathyContact       *last_contact;
	time_t                last_timestamp;
	gboolean              allow_scrolling;
	guint                 notify_system_fonts_id;
	EmpathySmileyManager *smiley_manager;
	gboolean              only_if_date;
} EmpathyChatTextViewPriv;

static void chat_text_view_iface_init (EmpathyChatViewIface *iface);

G_DEFINE_TYPE_WITH_CODE (EmpathyChatTextView, empathy_chat_text_view,
			 GTK_TYPE_TEXT_VIEW,
			 G_IMPLEMENT_INTERFACE (EMPATHY_TYPE_CHAT_VIEW,
						chat_text_view_iface_init));

enum {
	PROP_0,
	PROP_LAST_CONTACT,
	PROP_ONLY_IF_DATE
};

static gboolean
chat_text_view_url_event_cb (GtkTextTag          *tag,
			     GObject             *object,
			     GdkEvent            *event,
			     GtkTextIter         *iter,
			     EmpathyChatTextView *view)
{
	EmpathyChatTextViewPriv *priv;
	GtkTextIter              start, end;
	gchar                   *str;

	priv = GET_PRIV (view);

	/* If the link is being selected, don't do anything. */
	gtk_text_buffer_get_selection_bounds (priv->buffer, &start, &end);
	if (gtk_text_iter_get_offset (&start) != gtk_text_iter_get_offset (&end)) {
		return FALSE;
	}
	
	if (event->type == GDK_BUTTON_RELEASE && event->button.button == 1) {
		start = end = *iter;
		
		if (gtk_text_iter_backward_to_tag_toggle (&start, tag) &&
		    gtk_text_iter_forward_to_tag_toggle (&end, tag)) {
			    str = gtk_text_buffer_get_text (priv->buffer,
							    &start,
							    &end,
							    FALSE);
			    
			    empathy_url_show (GTK_WIDGET (view), str);
			    g_free (str);
		    }
	}
	
	return FALSE;
}

static gboolean
chat_text_view_event_cb (EmpathyChatTextView *view,
			 GdkEventMotion      *event,
			 GtkTextTag          *tag)
{
	static GdkCursor  *hand = NULL;
	static GdkCursor  *beam = NULL;
	GtkTextWindowType  type;
	GtkTextIter        iter;
	GdkWindow         *win;
	gint               x, y, buf_x, buf_y;
	
	type = gtk_text_view_get_window_type (GTK_TEXT_VIEW (view),
					      event->window);
	
	if (type != GTK_TEXT_WINDOW_TEXT) {
		return FALSE;
	}
	
	/* Get where the pointer really is. */
	win = gtk_text_view_get_window (GTK_TEXT_VIEW (view), type);
	if (!win) {
		return FALSE;
	}
	
	gdk_window_get_pointer (win, &x, &y, NULL);
	
	/* Get the iter where the cursor is at */
	gtk_text_view_window_to_buffer_coords (GTK_TEXT_VIEW (view), type,
					       x, y,
					       &buf_x, &buf_y);
	
	gtk_text_view_get_iter_at_location (GTK_TEXT_VIEW (view),
					    &iter,
					    buf_x, buf_y);
	
	if (gtk_text_iter_has_tag (&iter, tag)) {
		if (!hand) {
			hand = gdk_cursor_new (GDK_HAND2);
			beam = gdk_cursor_new (GDK_XTERM);
		}
		gdk_window_set_cursor (win, hand);
	} else {
		if (!beam) {
			beam = gdk_cursor_new (GDK_XTERM);
		}
		gdk_window_set_cursor (win, beam);
	}
	
	return FALSE;
}

static void
chat_text_view_create_tags (EmpathyChatTextView *view)
{
	EmpathyChatTextViewPriv *priv = GET_PRIV (view);
	GtkTextTag              *tag;

	gtk_text_buffer_create_tag (priv->buffer, EMPATHY_CHAT_TEXT_VIEW_TAG_CUT, NULL);
	gtk_text_buffer_create_tag (priv->buffer, EMPATHY_CHAT_TEXT_VIEW_TAG_HIGHLIGHT, NULL);
	gtk_text_buffer_create_tag (priv->buffer, EMPATHY_CHAT_TEXT_VIEW_TAG_SPACING, NULL);
	gtk_text_buffer_create_tag (priv->buffer, EMPATHY_CHAT_TEXT_VIEW_TAG_TIME, NULL);
	gtk_text_buffer_create_tag (priv->buffer, EMPATHY_CHAT_TEXT_VIEW_TAG_ACTION, NULL);
	gtk_text_buffer_create_tag (priv->buffer, EMPATHY_CHAT_TEXT_VIEW_TAG_BODY, NULL);
	gtk_text_buffer_create_tag (priv->buffer, EMPATHY_CHAT_TEXT_VIEW_TAG_EVENT, NULL);

	tag = gtk_text_buffer_create_tag (priv->buffer, EMPATHY_CHAT_TEXT_VIEW_TAG_LINK, NULL);
	g_signal_connect (tag, "event",
			  G_CALLBACK (chat_text_view_url_event_cb),
			  view);
	
	g_signal_connect (view, "motion-notify-event",
			  G_CALLBACK (chat_text_view_event_cb),
			  tag);
}

static void
chat_text_view_system_font_update (EmpathyChatTextView *view)
{
	PangoFontDescription *font_description = NULL;
	gchar                *font_name;
	
	if (empathy_conf_get_string (empathy_conf_get (),
				     "/desktop/gnome/interface/document_font_name",
				     &font_name) && font_name) {
					     font_description = pango_font_description_from_string (font_name);
					     g_free (font_name);
				     } else {
					     font_description = NULL;
				     }
	
	gtk_widget_modify_font (GTK_WIDGET (view), font_description);
	
	if (font_description) {
		pango_font_description_free (font_description);
	}
}

static void
chat_text_view_notify_system_font_cb (EmpathyConf *conf,
				      const gchar *key,
				      gpointer     user_data)
{
	EmpathyChatTextView *view = user_data;
	
	chat_text_view_system_font_update (view);
}

static void
chat_text_view_clear_view_cb (GtkMenuItem *menuitem, EmpathyChatTextView *view)
{
	empathy_chat_view_clear (EMPATHY_CHAT_VIEW (view));
}

static void
chat_text_view_open_address_cb (GtkMenuItem *menuitem, const gchar *url)
{
	empathy_url_show (GTK_WIDGET (menuitem), url);
}

static void
chat_text_view_copy_address_cb (GtkMenuItem *menuitem, const gchar *url)
{
	GtkClipboard *clipboard;
	
	clipboard = gtk_clipboard_get (GDK_SELECTION_CLIPBOARD);
	gtk_clipboard_set_text (clipboard, url, -1);
	
	clipboard = gtk_clipboard_get (GDK_SELECTION_PRIMARY);
	gtk_clipboard_set_text (clipboard, url, -1);
}

static void
chat_text_view_populate_popup (EmpathyChatTextView *view,
			  GtkMenu        *menu,
			  gpointer        user_data)
{
	EmpathyChatTextViewPriv *priv;
	GtkTextTagTable    *table;
	GtkTextTag         *tag;
	gint                x, y;
	GtkTextIter         iter, start, end;
	GtkWidget          *item;
	gchar              *str = NULL;
	
	priv = GET_PRIV (view);
	
	/* Clear menu item */
	if (gtk_text_buffer_get_char_count (priv->buffer) > 0) {
		item = gtk_menu_item_new ();
		gtk_menu_shell_prepend (GTK_MENU_SHELL (menu), item);
		gtk_widget_show (item);
		
		item = gtk_image_menu_item_new_from_stock (GTK_STOCK_CLEAR, NULL);
		gtk_menu_shell_prepend (GTK_MENU_SHELL (menu), item);
		gtk_widget_show (item);
		
		g_signal_connect (item,
				  "activate",
				  G_CALLBACK (chat_text_view_clear_view_cb),
				  view);
	}
	
	/* Link context menu items */
	table = gtk_text_buffer_get_tag_table (priv->buffer);
	tag = gtk_text_tag_table_lookup (table, EMPATHY_CHAT_TEXT_VIEW_TAG_LINK);
	
	gtk_widget_get_pointer (GTK_WIDGET (view), &x, &y);
	
	gtk_text_view_window_to_buffer_coords (GTK_TEXT_VIEW (view),
					       GTK_TEXT_WINDOW_WIDGET,
					       x, y,
					       &x, &y);
	
	gtk_text_view_get_iter_at_location (GTK_TEXT_VIEW (view), &iter, x, y);
	
	start = end = iter;
	
	if (gtk_text_iter_backward_to_tag_toggle (&start, tag) &&
	    gtk_text_iter_forward_to_tag_toggle (&end, tag)) {
		    str = gtk_text_buffer_get_text (priv->buffer,
						    &start, &end, FALSE);
	    }
	
	if (EMP_STR_EMPTY (str)) {
		g_free (str);
		return;
	}
	
	/* NOTE: Set data just to get the string freed when not needed. */
	g_object_set_data_full (G_OBJECT (menu),
				"url", str,
				(GDestroyNotify) g_free);
	
	item = gtk_menu_item_new ();
	gtk_menu_shell_prepend (GTK_MENU_SHELL (menu), item);
	gtk_widget_show (item);
	
	item = gtk_menu_item_new_with_mnemonic (_("_Copy Link Address"));
	g_signal_connect (item,
			  "activate",
			  G_CALLBACK (chat_text_view_copy_address_cb),
			  str);
	gtk_menu_shell_prepend (GTK_MENU_SHELL (menu), item);
	gtk_widget_show (item);
	
	item = gtk_menu_item_new_with_mnemonic (_("_Open Link"));
	g_signal_connect (item,
			  "activate",
			  G_CALLBACK (chat_text_view_open_address_cb),
			  str);
	gtk_menu_shell_prepend (GTK_MENU_SHELL (menu), item);
	gtk_widget_show (item);
}

static gboolean
chat_text_view_is_scrolled_down (EmpathyChatTextView *view)
{
	GtkWidget *sw;
	
	sw = gtk_widget_get_parent (GTK_WIDGET (view));
	if (GTK_IS_SCROLLED_WINDOW (sw)) {
		GtkAdjustment *vadj;
		
		vadj = gtk_scrolled_window_get_vadjustment (GTK_SCROLLED_WINDOW (sw));
		
		if (vadj->value + vadj->page_size / 2 < vadj->upper - vadj->page_size) {
			return FALSE;
		}
	}
	
	return TRUE;
}

static void
chat_text_view_maybe_trim_buffer (EmpathyChatTextView *view)
{
	EmpathyChatTextViewPriv *priv;
	GtkTextIter         top, bottom;
	gint                line;
	gint                remove;
	GtkTextTagTable    *table;
	GtkTextTag         *tag;
	
	priv = GET_PRIV (view);
	
	gtk_text_buffer_get_end_iter (priv->buffer, &bottom);
	line = gtk_text_iter_get_line (&bottom);
	if (line < MAX_LINES) {
		return;
	}
	
	remove = line - MAX_LINES;
	gtk_text_buffer_get_start_iter (priv->buffer, &top);
	
	bottom = top;
	if (!gtk_text_iter_forward_lines (&bottom, remove)) {
		return;
	}
	
	/* Track backwords to a place where we can safely cut, we don't do it in
	  * the middle of a tag.
	  */
	table = gtk_text_buffer_get_tag_table (priv->buffer);
	tag = gtk_text_tag_table_lookup (table, EMPATHY_CHAT_TEXT_VIEW_TAG_CUT);
	if (!tag) {
		return;
	}
	
	if (!gtk_text_iter_forward_to_tag_toggle (&bottom, tag)) {
		return;
	}
	
	if (!gtk_text_iter_equal (&top, &bottom)) {
		gtk_text_buffer_delete (priv->buffer, &top, &bottom);
	}
}

static void
chat_text_view_append_timestamp (EmpathyChatTextView *view,
				 time_t               timestamp,
				 gboolean             show_date)
{
	EmpathyChatTextViewPriv *priv = GET_PRIV (view);
	GtkTextIter              iter;
	gchar                   *tmp;
	GString                 *str;

	str = g_string_new ("- ");

	/* Append date if needed */
	if (show_date) {
		GDate *date;
		gchar  buf[256];

		date = g_date_new ();
		g_date_set_time_t (date, timestamp);
		/* Translators: timestamp displayed between conversations in
		 * chat windows (strftime format string) */
		g_date_strftime (buf, 256, _("%A %B %d %Y"), date);
		g_string_append (str, buf);
		g_string_append (str, ", ");
		g_date_free (date);
	}

	/* Append time */
	tmp = empathy_time_to_string_local (timestamp, EMPATHY_TIME_FORMAT_DISPLAY_SHORT);
	g_string_append (str, tmp);
	g_free (tmp);

	g_string_append (str, " -\n");

	/* Insert the string in the buffer */
	empathy_chat_text_view_append_spacing (view);
	gtk_text_buffer_get_end_iter (priv->buffer, &iter);
	gtk_text_buffer_insert_with_tags_by_name (priv->buffer,
						  &iter,
						  str->str, -1,
						  EMPATHY_CHAT_TEXT_VIEW_TAG_TIME,
						  NULL);

	priv->last_timestamp = timestamp;

	g_string_free (str, TRUE);	
}

static void
chat_text_maybe_append_date_and_time (EmpathyChatTextView *view,
				      time_t               timestamp)
{
	EmpathyChatTextViewPriv *priv = GET_PRIV (view);
	GDate                   *date, *last_date;
	gboolean                 append_date = FALSE;
	gboolean                 append_time = FALSE;

	/* Get the date from last message */
	last_date = g_date_new ();
	g_date_set_time_t (last_date, priv->last_timestamp);

	/* Get the date of the message we are appending */
	date = g_date_new ();
	g_date_set_time_t (date, timestamp);

	/* If last message was from another day we append date and time */
	if (g_date_compare (date, last_date) > 0) {
		append_date = TRUE;
		append_time = TRUE;
	}
	
	g_date_free (last_date);
	g_date_free (date);

	/* If last message is 'old' append the time */
	if (timestamp - priv->last_timestamp >= TIMESTAMP_INTERVAL) {
		append_time = TRUE;
	}

	if (append_date || (!priv->only_if_date && append_time)) {
		chat_text_view_append_timestamp (view, timestamp, append_date);
	}
}

static void
chat_text_view_size_allocate (GtkWidget     *widget,
			      GtkAllocation *alloc)
{
	gboolean down;
	
	down = chat_text_view_is_scrolled_down (EMPATHY_CHAT_TEXT_VIEW (widget));
	
	GTK_WIDGET_CLASS (empathy_chat_text_view_parent_class)->size_allocate (widget, alloc);
	
	if (down) {
		GtkAdjustment *adj;
		
		adj = GTK_TEXT_VIEW (widget)->vadjustment;
		gtk_adjustment_set_value (adj, adj->upper - adj->page_size);
	}
}

static gboolean
chat_text_view_drag_motion (GtkWidget      *widget,
			    GdkDragContext *context,
			    gint            x,
			    gint            y,
			    guint           time)
{
	/* Don't handle drag motion, since we don't want the view to scroll as
	 * the result of dragging something across it. */
	
	return FALSE;
}

static void
chat_text_view_get_property (GObject    *object,
			     guint       param_id,
			     GValue     *value,
			     GParamSpec *pspec)
{
	EmpathyChatTextViewPriv *priv = GET_PRIV (object);

	switch (param_id) {
	case PROP_LAST_CONTACT:
		g_value_set_object (value, priv->last_contact);
		break;
	case PROP_ONLY_IF_DATE:
		g_value_set_boolean (value, priv->only_if_date);
		break;
	default:
		G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
		break;
	};
}

static void
chat_text_view_set_property (GObject      *object,
			     guint         param_id,
			     const GValue *value,
			     GParamSpec   *pspec)
{
	EmpathyChatTextViewPriv *priv = GET_PRIV (object);

	switch (param_id) {
	case PROP_ONLY_IF_DATE:
		priv->only_if_date = g_value_get_boolean (value);
		break;
	default:
		G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
		break;
	};
}

static void
chat_text_view_finalize (GObject *object)
{
	EmpathyChatTextView     *view;
	EmpathyChatTextViewPriv *priv;
	
	view = EMPATHY_CHAT_TEXT_VIEW (object);
	priv = GET_PRIV (view);
	
	DEBUG ("%p", object);
	
	empathy_conf_notify_remove (empathy_conf_get (), priv->notify_system_fonts_id);
	
	if (priv->last_contact) {
		g_object_unref (priv->last_contact);
	}
	if (priv->scroll_time) {
		g_timer_destroy (priv->scroll_time);
	}
	if (priv->scroll_timeout) {
		g_source_remove (priv->scroll_timeout);
	}
	
	G_OBJECT_CLASS (empathy_chat_text_view_parent_class)->finalize (object);
}

static void
empathy_chat_text_view_class_init (EmpathyChatTextViewClass *klass)
{
	GObjectClass   *object_class = G_OBJECT_CLASS (klass);
	GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
	
	object_class->finalize = chat_text_view_finalize;
	object_class->get_property = chat_text_view_get_property;
	object_class->set_property = chat_text_view_set_property;

	widget_class->size_allocate = chat_text_view_size_allocate;
	widget_class->drag_motion = chat_text_view_drag_motion; 

	g_object_class_install_property (object_class,
					 PROP_LAST_CONTACT,
					 g_param_spec_object ("last-contact",
							      "Last contact",
							      "The sender of the last received message",
							      EMPATHY_TYPE_CONTACT,
							      G_PARAM_READABLE));
	g_object_class_install_property (object_class,
					 PROP_ONLY_IF_DATE,
					 g_param_spec_boolean ("only-if-date",
							      "Only if date",
							      "Display timestamp only if the date changes",
							      FALSE,
							      G_PARAM_READWRITE));


	g_type_class_add_private (object_class, sizeof (EmpathyChatTextViewPriv));
}

static void
empathy_chat_text_view_init (EmpathyChatTextView *view)
{
	EmpathyChatTextViewPriv *priv = G_TYPE_INSTANCE_GET_PRIVATE (view,
		EMPATHY_TYPE_CHAT_TEXT_VIEW, EmpathyChatTextViewPriv);

	view->priv = priv;	
	priv->buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (view));
	priv->last_timestamp = 0;
	priv->allow_scrolling = TRUE;
	priv->smiley_manager = empathy_smiley_manager_dup_singleton ();
	
	g_object_set (view,
		      "wrap-mode", GTK_WRAP_WORD_CHAR,
		      "editable", FALSE,
		      "cursor-visible", FALSE,
		      NULL);
	
	priv->notify_system_fonts_id =
		empathy_conf_notify_add (empathy_conf_get (),
					 "/desktop/gnome/interface/document_font_name",
					 chat_text_view_notify_system_font_cb,
					 view);
	chat_text_view_system_font_update (view);
	chat_text_view_create_tags (view);

	g_signal_connect (view,
			  "populate-popup",
			  G_CALLBACK (chat_text_view_populate_popup),
			  NULL);
}

/* Code stolen from pidgin/gtkimhtml.c */
static gboolean
chat_text_view_scroll_cb (EmpathyChatTextView *view)
{
	EmpathyChatTextViewPriv *priv;
	GtkAdjustment      *adj;
	gdouble             max_val;
	
	priv = GET_PRIV (view);
	adj = GTK_TEXT_VIEW (view)->vadjustment;
	max_val = adj->upper - adj->page_size;
	
	g_return_val_if_fail (priv->scroll_time != NULL, FALSE);
	
	if (g_timer_elapsed (priv->scroll_time, NULL) > MAX_SCROLL_TIME) {
		/* time's up. jump to the end and kill the timer */
		gtk_adjustment_set_value (adj, max_val);
		g_timer_destroy (priv->scroll_time);
		priv->scroll_time = NULL;
		priv->scroll_timeout = 0;
		return FALSE;
	}
	
	/* scroll by 1/3rd the remaining distance */
	gtk_adjustment_set_value (adj, gtk_adjustment_get_value (adj) + ((max_val - gtk_adjustment_get_value (adj)) / 3));
	return TRUE;
}

static void
chat_text_view_scroll_down (EmpathyChatView *view)
{
	EmpathyChatTextViewPriv *priv = GET_PRIV (view);
	
	g_return_if_fail (EMPATHY_IS_CHAT_TEXT_VIEW (view));
	
	if (!priv->allow_scrolling) {
		return;
	}

	DEBUG ("Scrolling down");

	if (priv->scroll_time) {
		g_timer_reset (priv->scroll_time);
	} else {
		priv->scroll_time = g_timer_new();
	}
	if (!priv->scroll_timeout) {
		priv->scroll_timeout = g_timeout_add (SCROLL_DELAY,
						      (GSourceFunc) chat_text_view_scroll_cb,
						      view);
	}
}

static void
chat_text_view_append_message (EmpathyChatView *view,
			       EmpathyMessage  *msg)
{
	EmpathyChatTextView     *text_view = EMPATHY_CHAT_TEXT_VIEW (view);
	EmpathyChatTextViewPriv *priv = GET_PRIV (text_view);
	gboolean                 bottom;
	time_t                   timestamp;
	
	g_return_if_fail (EMPATHY_IS_CHAT_TEXT_VIEW (view));
	g_return_if_fail (EMPATHY_IS_MESSAGE (msg));
	
	if (!empathy_message_get_body (msg)) {
		return;
	}
	
	bottom = chat_text_view_is_scrolled_down (text_view);
	
	chat_text_view_maybe_trim_buffer (EMPATHY_CHAT_TEXT_VIEW (view));
	
	timestamp = empathy_message_get_timestamp (msg);
	chat_text_maybe_append_date_and_time (text_view, timestamp);
	if (EMPATHY_CHAT_TEXT_VIEW_GET_CLASS (view)->append_message) {
		EMPATHY_CHAT_TEXT_VIEW_GET_CLASS (view)->append_message (text_view,
									 msg);
	}
	
	if (bottom) {
		chat_text_view_scroll_down (view);
	}
	
	if (priv->last_contact) {
		g_object_unref (priv->last_contact);
	}
	priv->last_contact = g_object_ref (empathy_message_get_sender (msg));
	g_object_notify (G_OBJECT (view), "last-contact");
}

static void
chat_text_view_append_event (EmpathyChatView *view,
			     const gchar     *str)
{
	EmpathyChatTextView     *text_view = EMPATHY_CHAT_TEXT_VIEW (view);
	EmpathyChatTextViewPriv *priv = GET_PRIV (text_view);
	gboolean                 bottom;
	GtkTextIter              iter;
	gchar                   *msg;


	g_return_if_fail (EMPATHY_IS_CHAT_TEXT_VIEW (view));
	g_return_if_fail (!EMP_STR_EMPTY (str));

	bottom = chat_text_view_is_scrolled_down (text_view);
	chat_text_view_maybe_trim_buffer (EMPATHY_CHAT_TEXT_VIEW (view));
	chat_text_maybe_append_date_and_time (text_view,
					      empathy_time_get_current ());

	gtk_text_buffer_get_end_iter (priv->buffer, &iter);
	msg = g_strdup_printf (" - %s\n", str);
	gtk_text_buffer_insert_with_tags_by_name (priv->buffer, &iter,
						  msg, -1,
						  EMPATHY_CHAT_TEXT_VIEW_TAG_EVENT,
						  NULL);
	g_free (msg);

	if (bottom) {
		chat_text_view_scroll_down (view);
	}
	
	if (priv->last_contact) {
		g_object_unref (priv->last_contact);
		priv->last_contact = NULL;
		g_object_notify (G_OBJECT (view), "last-contact");
	}
}

static void
chat_text_view_scroll (EmpathyChatView *view,
		       gboolean         allow_scrolling)
{
	EmpathyChatTextViewPriv *priv = GET_PRIV (view);
	
	g_return_if_fail (EMPATHY_IS_CHAT_TEXT_VIEW (view));
	
	DEBUG ("Scrolling %s", allow_scrolling ? "enabled" : "disabled");

	priv->allow_scrolling = allow_scrolling;
	if (allow_scrolling) {
		empathy_chat_view_scroll_down (view);
	}
}

static gboolean
chat_text_view_get_has_selection (EmpathyChatView *view)
{
	GtkTextBuffer *buffer;
	
	g_return_val_if_fail (EMPATHY_IS_CHAT_TEXT_VIEW (view), FALSE);
	
	buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (view));
	
	return gtk_text_buffer_get_has_selection (buffer);
}

static void
chat_text_view_clear (EmpathyChatView *view)
{
	GtkTextBuffer      *buffer;
	EmpathyChatTextViewPriv *priv;
	
	g_return_if_fail (EMPATHY_IS_CHAT_TEXT_VIEW (view));
	
	buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (view));
	gtk_text_buffer_set_text (buffer, "", -1);
	
	/* We set these back to the initial values so we get
	  * timestamps when clearing the window to know when
	  * conversations start.
	  */
	priv = GET_PRIV (view);
	
	priv->last_timestamp = 0;
}

static gboolean
chat_text_view_find_previous (EmpathyChatView *view,
				const gchar     *search_criteria,
				gboolean         new_search)
{
	EmpathyChatTextViewPriv *priv;
	GtkTextBuffer      *buffer;
	GtkTextIter         iter_at_mark;
	GtkTextIter         iter_match_start;
	GtkTextIter         iter_match_end;
	gboolean            found;
	gboolean            from_start = FALSE;
	
	g_return_val_if_fail (EMPATHY_IS_CHAT_TEXT_VIEW (view), FALSE);
	g_return_val_if_fail (search_criteria != NULL, FALSE);
	
	priv = GET_PRIV (view);
	
	buffer = priv->buffer;
	
	if (EMP_STR_EMPTY (search_criteria)) {
		if (priv->find_mark_previous) {
			gtk_text_buffer_get_start_iter (buffer, &iter_at_mark);
			
			gtk_text_buffer_move_mark (buffer,
						   priv->find_mark_previous,
						   &iter_at_mark);
			gtk_text_view_scroll_to_mark (GTK_TEXT_VIEW (view),
						      priv->find_mark_previous,
						      0.0,
						      TRUE,
						      0.0,
						      0.0);
			gtk_text_buffer_select_range (buffer,
						      &iter_at_mark,
						      &iter_at_mark);
		}
		
		return FALSE;
	}
	
	if (new_search) {
		from_start = TRUE;
	}
	
	if (priv->find_mark_previous) {
		gtk_text_buffer_get_iter_at_mark (buffer,
						  &iter_at_mark,
						  priv->find_mark_previous);
	} else {
		gtk_text_buffer_get_end_iter (buffer, &iter_at_mark);
		from_start = TRUE;
	}
	
	priv->find_last_direction = FALSE;
	
	found = empathy_text_iter_backward_search (&iter_at_mark,
						   search_criteria,
						   &iter_match_start,
						   &iter_match_end,
						   NULL);
	
	if (!found) {
		gboolean result = FALSE;
		
		if (from_start) {
			return result;
		}
		
		/* Here we wrap around. */
		if (!new_search && !priv->find_wrapped) {
			priv->find_wrapped = TRUE;
			result = chat_text_view_find_previous (view,
								 search_criteria, 
								 FALSE);
			priv->find_wrapped = FALSE;
		}
		
		return result;
	}
	
	/* Set new mark and show on screen */
	if (!priv->find_mark_previous) {
		priv->find_mark_previous = gtk_text_buffer_create_mark (buffer, NULL,
									&iter_match_start,
									TRUE);
	} else {
		gtk_text_buffer_move_mark (buffer,
					   priv->find_mark_previous,
					   &iter_match_start);
	}
	
	if (!priv->find_mark_next) {
		priv->find_mark_next = gtk_text_buffer_create_mark (buffer, NULL,
								    &iter_match_end,
								    TRUE);
	} else {
		gtk_text_buffer_move_mark (buffer,
					   priv->find_mark_next,
					   &iter_match_end);
	}
	
	gtk_text_view_scroll_to_mark (GTK_TEXT_VIEW (view),
				      priv->find_mark_previous,
				      0.0,
				      TRUE,
				      0.5,
				      0.5);
	
	gtk_text_buffer_move_mark_by_name (buffer, "selection_bound", &iter_match_start);
	gtk_text_buffer_move_mark_by_name (buffer, "insert", &iter_match_end);
	
	return TRUE;
}

static gboolean
chat_text_view_find_next (EmpathyChatView *view,
			    const gchar     *search_criteria,
			    gboolean         new_search)
{
	EmpathyChatTextViewPriv *priv;
	GtkTextBuffer      *buffer;
	GtkTextIter         iter_at_mark;
	GtkTextIter         iter_match_start;
	GtkTextIter         iter_match_end;
	gboolean            found;
	gboolean            from_start = FALSE;
	
	g_return_val_if_fail (EMPATHY_IS_CHAT_TEXT_VIEW (view), FALSE);
	g_return_val_if_fail (search_criteria != NULL, FALSE);
	
	priv = GET_PRIV (view);
	
	buffer = priv->buffer;
	
	if (EMP_STR_EMPTY (search_criteria)) {
		if (priv->find_mark_next) {
			gtk_text_buffer_get_start_iter (buffer, &iter_at_mark);
			
			gtk_text_buffer_move_mark (buffer,
						   priv->find_mark_next,
						   &iter_at_mark);
			gtk_text_view_scroll_to_mark (GTK_TEXT_VIEW (view),
						      priv->find_mark_next,
						      0.0,
						      TRUE,
						      0.0,
						      0.0);
			gtk_text_buffer_select_range (buffer,
						      &iter_at_mark,
						      &iter_at_mark);
		}
		
		return FALSE;
	}
	
	if (new_search) {
		from_start = TRUE;
	}
	
	if (priv->find_mark_next) {
		gtk_text_buffer_get_iter_at_mark (buffer,
						  &iter_at_mark,
						  priv->find_mark_next);
	} else {
		gtk_text_buffer_get_start_iter (buffer, &iter_at_mark);
		from_start = TRUE;
	}
	
	priv->find_last_direction = TRUE;
	
	found = empathy_text_iter_forward_search (&iter_at_mark,
						  search_criteria,
						  &iter_match_start,
						  &iter_match_end,
						  NULL);
	
	if (!found) {
		gboolean result = FALSE;
		
		if (from_start) {
			return result;
		}
		
		/* Here we wrap around. */
		if (!new_search && !priv->find_wrapped) {
			priv->find_wrapped = TRUE;
			result = chat_text_view_find_next (view, 
							     search_criteria, 
							     FALSE);
			priv->find_wrapped = FALSE;
		}
		
		return result;
	}
	
	/* Set new mark and show on screen */
	if (!priv->find_mark_next) {
		priv->find_mark_next = gtk_text_buffer_create_mark (buffer, NULL,
								    &iter_match_end,
								    TRUE);
	} else {
		gtk_text_buffer_move_mark (buffer,
					   priv->find_mark_next,
					   &iter_match_end);
	}
	
	if (!priv->find_mark_previous) {
		priv->find_mark_previous = gtk_text_buffer_create_mark (buffer, NULL,
									&iter_match_start,
									TRUE);
	} else {
		gtk_text_buffer_move_mark (buffer,
					   priv->find_mark_previous,
					   &iter_match_start);
	}
	
	gtk_text_view_scroll_to_mark (GTK_TEXT_VIEW (view),
				      priv->find_mark_next,
				      0.0,
				      TRUE,
				      0.5,
				      0.5);
	
	gtk_text_buffer_move_mark_by_name (buffer, "selection_bound", &iter_match_start);
	gtk_text_buffer_move_mark_by_name (buffer, "insert", &iter_match_end);
	
	return TRUE;
}

static void
chat_text_view_find_abilities (EmpathyChatView *view,
				 const gchar    *search_criteria,
				 gboolean       *can_do_previous,
				 gboolean       *can_do_next)
{
	EmpathyChatTextViewPriv *priv;
	GtkTextBuffer           *buffer;
	GtkTextIter              iter_at_mark;
	GtkTextIter              iter_match_start;
	GtkTextIter              iter_match_end;
	
	g_return_if_fail (EMPATHY_IS_CHAT_TEXT_VIEW (view));
	g_return_if_fail (search_criteria != NULL);
	g_return_if_fail (can_do_previous != NULL && can_do_next != NULL);
	
	priv = GET_PRIV (view);
	
	buffer = priv->buffer;
	
	if (can_do_previous) {
		if (priv->find_mark_previous) {
			gtk_text_buffer_get_iter_at_mark (buffer,
							  &iter_at_mark,
							  priv->find_mark_previous);
		} else {
			gtk_text_buffer_get_start_iter (buffer, &iter_at_mark);
		}
		
		*can_do_previous = empathy_text_iter_backward_search (&iter_at_mark,
								      search_criteria,
								      &iter_match_start,
								      &iter_match_end,
								      NULL);
	}
	
	if (can_do_next) {
		if (priv->find_mark_next) {
			gtk_text_buffer_get_iter_at_mark (buffer,
							  &iter_at_mark,
							  priv->find_mark_next);
		} else {
			gtk_text_buffer_get_start_iter (buffer, &iter_at_mark);
		}
		
		*can_do_next = empathy_text_iter_forward_search (&iter_at_mark,
								 search_criteria,
								 &iter_match_start,
								 &iter_match_end,
								 NULL);
	}
}

static void
chat_text_view_highlight (EmpathyChatView *view,
			    const gchar     *text)
{
	GtkTextBuffer *buffer;
	GtkTextIter    iter;
	GtkTextIter    iter_start;
	GtkTextIter    iter_end;
	GtkTextIter    iter_match_start;
	GtkTextIter    iter_match_end;
	gboolean       found;
	
	g_return_if_fail (EMPATHY_IS_CHAT_TEXT_VIEW (view));
	
	buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (view));
	
	gtk_text_buffer_get_start_iter (buffer, &iter);
	
	gtk_text_buffer_get_bounds (buffer, &iter_start, &iter_end);
	gtk_text_buffer_remove_tag_by_name (buffer, EMPATHY_CHAT_TEXT_VIEW_TAG_HIGHLIGHT,
					    &iter_start,
					    &iter_end);
	
	if (EMP_STR_EMPTY (text)) {
		return;
	}
	
	while (1) {
		found = empathy_text_iter_forward_search (&iter,
							  text,
							  &iter_match_start,
							  &iter_match_end,
							  NULL);
		
		if (!found) {
			break;
		}
		
		gtk_text_buffer_apply_tag_by_name (buffer, EMPATHY_CHAT_TEXT_VIEW_TAG_HIGHLIGHT,
						   &iter_match_start,
						   &iter_match_end);
		
		iter = iter_match_end;
		gtk_text_iter_forward_char (&iter);
	}
}

static void
chat_text_view_copy_clipboard (EmpathyChatView *view)
{
	GtkTextBuffer *buffer;
	GtkClipboard  *clipboard;
	
	g_return_if_fail (EMPATHY_IS_CHAT_TEXT_VIEW (view));
	
	buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (view));
	clipboard = gtk_clipboard_get (GDK_SELECTION_CLIPBOARD);
	
	gtk_text_buffer_copy_clipboard (buffer, clipboard);
}

static void
chat_text_view_iface_init (EmpathyChatViewIface *iface)
{
	iface->append_message = chat_text_view_append_message;
	iface->append_event = chat_text_view_append_event;
	iface->scroll = chat_text_view_scroll;
	iface->scroll_down = chat_text_view_scroll_down;
	iface->get_has_selection = chat_text_view_get_has_selection;
	iface->clear = chat_text_view_clear;
	iface->find_previous = chat_text_view_find_previous;
	iface->find_next = chat_text_view_find_next;
	iface->find_abilities = chat_text_view_find_abilities;
	iface->highlight = chat_text_view_highlight;
	iface->copy_clipboard = chat_text_view_copy_clipboard;
}

EmpathyContact *
empathy_chat_text_view_get_last_contact (EmpathyChatTextView *view)
{
	EmpathyChatTextViewPriv *priv = GET_PRIV (view);
	
	g_return_val_if_fail (EMPATHY_IS_CHAT_TEXT_VIEW (view), NULL);
	
	return priv->last_contact;
}

void
empathy_chat_text_view_set_only_if_date (EmpathyChatTextView *view,
					 gboolean             only_if_date)
{
	EmpathyChatTextViewPriv *priv = GET_PRIV (view);
	
	g_return_if_fail (EMPATHY_IS_CHAT_TEXT_VIEW (view));

	if (only_if_date != priv->only_if_date) {
		priv->only_if_date = only_if_date;
		g_object_notify (G_OBJECT (view), "only-if-date");
	}
}

static void
chat_text_view_insert_text_with_emoticons (EmpathyChatTextView *view,
					   GtkTextIter         *iter,
					   const gchar         *str)
{
	EmpathyChatTextViewPriv *priv = GET_PRIV (view);
	gboolean                 use_smileys = FALSE;
	GSList                  *smileys, *l;

	empathy_conf_get_bool (empathy_conf_get (),
			       EMPATHY_PREFS_CHAT_SHOW_SMILEYS,
			       &use_smileys);

	if (!use_smileys) {
		gtk_text_buffer_insert (priv->buffer, iter, str, -1);
		return;
	}

	smileys = empathy_smiley_manager_parse (priv->smiley_manager, str);
	for (l = smileys; l; l = l->next) {
		EmpathySmiley *smiley;

		smiley = l->data;
		if (smiley->pixbuf) {
			gtk_text_buffer_insert_pixbuf (priv->buffer, iter, smiley->pixbuf);
		} else {
			gtk_text_buffer_insert (priv->buffer, iter, smiley->str, -1);
		}
		empathy_smiley_free (smiley);
	}
	g_slist_free (smileys);
}

void
empathy_chat_text_view_append_body (EmpathyChatTextView *view,
				    const gchar         *body,
				    const gchar         *tag)
{
	EmpathyChatTextViewPriv *priv = GET_PRIV (view);
	GtkTextIter              start_iter, end_iter;
	GtkTextMark             *mark;
	GtkTextIter              iter;
	GRegex                  *uri_regex;
	GMatchInfo              *match_info;
	gboolean                 match;
	gint                     last = 0;
	gint                     s = 0, e = 0;
	gchar                   *tmp;

	priv = GET_PRIV (view);

	gtk_text_buffer_get_end_iter (priv->buffer, &start_iter);
	mark = gtk_text_buffer_create_mark (priv->buffer, NULL, &start_iter, TRUE);

	uri_regex = empathy_uri_regex_dup_singleton ();
	for (match = g_regex_match (uri_regex, body, 0, &match_info); match;
	     match = g_match_info_next (match_info, NULL)) {
		if (!g_match_info_fetch_pos (match_info, 0, &s, &e))
			continue;

		if (s > last) {
			tmp = empathy_substring (body, last, s);

			gtk_text_buffer_get_end_iter (priv->buffer, &iter);
			chat_text_view_insert_text_with_emoticons (view,
								   &iter,
								   tmp);
			g_free (tmp);
		}

		tmp = empathy_substring (body, s, e);

		gtk_text_buffer_get_end_iter (priv->buffer, &iter);
		gtk_text_buffer_insert_with_tags_by_name (priv->buffer,
							  &iter,
							  tmp,
							  -1,
							  EMPATHY_CHAT_TEXT_VIEW_TAG_LINK,
							  NULL);

		g_free (tmp);
		last = e;
	}
	g_match_info_free (match_info);
	g_regex_unref (uri_regex);

	if (last < strlen (body)) {
		gtk_text_buffer_get_end_iter (priv->buffer, &iter);
		chat_text_view_insert_text_with_emoticons (view,
							   &iter,
							   body + last);
	}

	gtk_text_buffer_get_end_iter (priv->buffer, &iter);
	gtk_text_buffer_insert (priv->buffer, &iter, "\n", 1);

	/* Apply the style to the inserted text. */
	gtk_text_buffer_get_iter_at_mark (priv->buffer, &start_iter, mark);
	gtk_text_buffer_get_end_iter (priv->buffer, &end_iter);

	gtk_text_buffer_apply_tag_by_name (priv->buffer,
					   tag,
					   &start_iter,
					   &end_iter);

	gtk_text_buffer_delete_mark (priv->buffer, mark);
}

void
empathy_chat_text_view_append_spacing (EmpathyChatTextView *view)
{
	EmpathyChatTextViewPriv *priv = GET_PRIV (view);
	GtkTextIter              iter;

	gtk_text_buffer_get_end_iter (priv->buffer, &iter);
	gtk_text_buffer_insert_with_tags_by_name (priv->buffer,
						  &iter,
						  "\n",
						  -1,
						  EMPATHY_CHAT_TEXT_VIEW_TAG_CUT,
						  EMPATHY_CHAT_TEXT_VIEW_TAG_SPACING,
						  NULL);
}

GtkTextTag *
empathy_chat_text_view_tag_set (EmpathyChatTextView *view,
				const gchar         *tag_name,
				const gchar         *first_property_name,
				...)
{
	EmpathyChatTextViewPriv *priv = GET_PRIV (view);
	GtkTextTag              *tag;
	GtkTextTagTable         *table;
	va_list                  list;

	g_return_val_if_fail (EMPATHY_IS_CHAT_TEXT_VIEW (view), NULL);
	g_return_val_if_fail (tag_name != NULL, NULL);

	table = gtk_text_buffer_get_tag_table (priv->buffer);
	tag = gtk_text_tag_table_lookup (table, tag_name);

	if (tag && first_property_name) {
		va_start (list, first_property_name);
		g_object_set_valist (G_OBJECT (tag), first_property_name, list);
		va_end (list);
	}

	return tag;
}