/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * Copyright (C) 2008 Collabora Ltd.
 *
 * 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 2.1 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Authors: Xavier Claessens <xclaesse@gmail.com>
 */

#include "config.h"
#include <string.h>

#include <libempathy/empathy-time.h>
#include <libempathy/empathy-utils.h>

#include "empathy-theme-adium.h"

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

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

typedef struct {
	gchar          *in_content_html;
	gsize           in_content_len;
	gchar          *in_nextcontent_html;
	gsize           in_nextcontent_len;
	gchar          *out_content_html;
	gsize           out_content_len;
	gchar          *out_nextcontent_html;
	gsize           out_nextcontent_len;
	EmpathyContact *last_contact;
	gboolean        ready;
	GList          *message_queue;
	gchar          *default_avatar_filename;
} EmpathyThemeAdiumPriv;

static void theme_adium_iface_init (EmpathyChatViewIface *iface);

G_DEFINE_TYPE_WITH_CODE (EmpathyThemeAdium, empathy_theme_adium,
			 WEBKIT_TYPE_WEB_VIEW,
			 G_IMPLEMENT_INTERFACE (EMPATHY_TYPE_CHAT_VIEW,
						theme_adium_iface_init));

static void
theme_adium_load (EmpathyThemeAdium *theme)
{
	EmpathyThemeAdiumPriv *priv = GET_PRIV (theme);
	gchar                 *basedir;
	gchar                 *file;
	gchar                 *template_html;
	gsize                  template_len;
	GString               *string;
	gchar                **strv;
	gchar                 *content;
	gchar                 *css_path;

	/* FIXME: Find a better way to get the theme dir */
	basedir = g_build_filename (g_get_home_dir (), "Contents", "Resources", NULL);

	/* Load html files */
	file = g_build_filename (basedir, "Template.html", NULL);
	g_file_get_contents (file, &template_html, &template_len, NULL);
	g_free (file);

	file = g_build_filename (basedir, "Incoming", "Content.html", NULL);
	g_file_get_contents (file, &priv->in_content_html, &priv->in_content_len, NULL);
	g_free (file);

	file = g_build_filename (basedir, "Incoming", "NextContent.html", NULL);
	g_file_get_contents (file, &priv->in_nextcontent_html, &priv->in_nextcontent_len, NULL);
	g_free (file);

	file = g_build_filename (basedir, "Outgoing", "Content.html", NULL);
	g_file_get_contents (file, &priv->out_content_html, &priv->out_content_len, NULL);
	g_free (file);

	file = g_build_filename (basedir, "Outgoing", "NextContent.html", NULL);
	g_file_get_contents (file, &priv->out_nextcontent_html, &priv->out_nextcontent_len, NULL);
	g_free (file);

	css_path = g_build_filename (basedir, "main.css", NULL);

	/* Replace %@ with the needed information in the template html */
	strv = g_strsplit (template_html, "%@", 5);
	string = g_string_sized_new (template_len);
	g_string_append (string, strv[0]);
	g_string_append (string, basedir);
	g_string_append (string, strv[1]);
	g_string_append (string, css_path);
	g_string_append (string, strv[2]);
	g_string_append (string, ""); /* We don't want header */
	g_string_append (string, strv[3]);
	g_string_append (string, ""); /* We have no footer */
	g_string_append (string, strv[4]);
	content = g_string_free (string, FALSE);

	/* Load the template */
	webkit_web_view_load_html_string (WEBKIT_WEB_VIEW (theme),
					  content, basedir);

	g_free (basedir);
	g_free (content);
	g_free (template_html);
	g_free (css_path);
	g_strfreev (strv);
}

static gchar *
theme_adium_escape_script (const gchar *text)
{
	const gchar *cur = text;
	GString     *string;

	string = g_string_sized_new (strlen (text));
	while (!G_STR_EMPTY (cur)) {
		switch (*cur) {
		case '\\':
			g_string_append (string, "\\\\");	
			break;
		case '\"':
			g_string_append (string, "\\\"");
			break;
		case '\r':
			g_string_append (string, "<br/>");
			break;
		case '\n':
			break;
		default:
			g_string_append_c (string, *cur);
		}
		cur++;
	}

	return g_string_free (string, FALSE);
}

static gchar *
theme_adium_escape_body (const gchar *body)
{
	gchar *ret, *iter;

	/* Replace \n by \r so it will be replaced by <br/> */
	ret = g_strdup (body);
	for (iter = ret; *iter != '\0'; iter++) {
		if (*iter == '\n') {
			*iter = '\r';
		}
	}

	return ret;
}

static const gchar *
theme_adium_get_default_avatar_filename (EmpathyThemeAdium *theme)
{
	EmpathyThemeAdiumPriv *priv = GET_PRIV (theme);
	GtkIconTheme          *icon_theme;
	GtkIconInfo           *icon_info;
	gint                   w, h;
	gint                   size = 48;

	/* Lazy initialization */
	if (priv->default_avatar_filename) {
		return priv->default_avatar_filename;
	}

	icon_theme = gtk_icon_theme_get_default ();

	if (gtk_icon_size_lookup (GTK_ICON_SIZE_DIALOG, &w, &h)) {
		size = (w + h) / 2;
	}

	/* FIXME: We should not avoid SVG, but old webkit from ubuntu hardy
	 * can't load them correctly. */
	icon_info = gtk_icon_theme_lookup_icon (icon_theme, "stock_person",
						size, GTK_ICON_LOOKUP_NO_SVG);
	priv->default_avatar_filename = g_strdup (gtk_icon_info_get_filename (icon_info));
	gtk_icon_info_free (icon_info);

	return priv->default_avatar_filename;
}

static void
theme_adium_scroll_down (EmpathyChatView *view)
{
	/* Not implemented */
}

#define FOLLOW(cur, str) (!strncmp (cur, str, strlen (str)))
static void
theme_adium_append_message (EmpathyChatView *view,
			    EmpathyMessage  *msg)
{
	EmpathyThemeAdium     *theme = EMPATHY_THEME_ADIUM (view);
	EmpathyThemeAdiumPriv *priv = GET_PRIV (theme);
	EmpathyContact        *sender;
	gchar                 *body;
	const gchar           *name;
	EmpathyAvatar         *avatar;
	const gchar           *avatar_filename = NULL;
	time_t                 timestamp;
	gsize                  len;
	GString               *string;
	gchar                 *cur = NULL;
	gchar                 *prev;
	gchar                 *script;
	gchar                 *escape;
	const gchar           *func;

	if (!priv->ready) {
		priv->message_queue = g_list_prepend (priv->message_queue,
						      g_object_ref (msg));
		return;
	}

	/* Get information */
	sender = empathy_message_get_sender (msg);
	timestamp = empathy_message_get_timestamp (msg);
	body = theme_adium_escape_body (empathy_message_get_body (msg));
	name = empathy_contact_get_name (sender);
	avatar = empathy_contact_get_avatar (sender);
	if (avatar) {
		avatar_filename = avatar->filename;
	}
	if (!avatar_filename) {
		avatar_filename = theme_adium_get_default_avatar_filename (theme);
	}

	/* Get the right html/func to add the message */
	if (priv->last_contact &&
	    empathy_contact_equal (priv->last_contact, sender)) {
		func = "appendNextMessage";
		if (empathy_contact_is_user (sender)) {
			cur = priv->out_nextcontent_html;
			len = priv->out_nextcontent_len;
		}
		if (!cur) {
			cur = priv->in_nextcontent_html;
			len = priv->in_nextcontent_len;
		}
	}
	if (!cur) {
		func = "appendMessage";
		if (empathy_contact_is_user (sender)) {
			cur = priv->out_content_html;
			len = priv->out_content_len;
		}
		if (!cur) {
			cur = priv->in_content_html;
			len = priv->in_content_len;
		}
	}

	/* Make some search-and-replece in the html code */
	prev = cur;
	string = g_string_sized_new (len + strlen (body));
	while ((cur = strchr (cur, '%'))) {
		const gchar *replace = NULL;
		gchar       *dup_replace = NULL;
		gchar       *fin = NULL;

		if (FOLLOW (cur, "%message%")) {
			replace = body;
		} else if (FOLLOW (cur, "%userIconPath%")) {
			replace = avatar_filename;
		} else if (FOLLOW (cur, "%sender%")) {
			replace = name;
		} else if (FOLLOW (cur, "%time")) {
			gchar *format = NULL;
			gchar *start;
			gchar *end;

			/* Extract the time format it provided. */
			if (*(start = cur + strlen("%time")) == '{') {
				start++;
				end = strstr (start, "}%");
				if (!end) /* Invalid string */
					continue;
				format = g_strndup (start, end - start);
				fin = end + 1;
			} 

			dup_replace = empathy_time_to_string_local (timestamp,
				format ? format : EMPATHY_TIME_FORMAT_DISPLAY_SHORT);
			replace = dup_replace;
			g_free (format);
		} else {
			cur++;
			continue;
		}

		/* Here we have a replacement to make */
		g_string_append_len (string, prev, cur - prev);
		g_string_append (string, replace);
		g_free (dup_replace);

		/* And update the pointers */
		if (fin) {
			prev = cur = fin + 1;
		} else {
			prev = cur = strchr (cur + 1, '%') + 1;
		}
	}
	g_string_append (string, prev);

	/* Execute a js to add the message */
	cur = g_string_free (string, FALSE);
	escape = theme_adium_escape_script (cur);
	script = g_strdup_printf("%s(\"%s\")", func, escape);
	webkit_web_view_execute_script (WEBKIT_WEB_VIEW (view), script);

	/* Keep the sender of the last displayed message */
	if (priv->last_contact) {
		g_object_unref (priv->last_contact);
	}
	priv->last_contact = g_object_ref (sender);

	g_free (body);
	g_free (cur);
	g_free (script);
}
#undef FOLLOW

static void
theme_adium_append_event (EmpathyChatView *view,
			  const gchar     *str)
{
	/* Not implemented */
}

static void
theme_adium_scroll (EmpathyChatView *view,
		    gboolean         allow_scrolling)
{
	/* Not implemented */
}

static gboolean
theme_adium_get_has_selection (EmpathyChatView *view)
{
	/* Not implemented */
	return FALSE;
}

static void
theme_adium_clear (EmpathyChatView *view)
{
	/* Not implemented */
}

static gboolean
theme_adium_find_previous (EmpathyChatView *view,
			   const gchar     *search_criteria,
			   gboolean         new_search)
{
	/* Not implemented */
	return FALSE;
}

static gboolean
theme_adium_find_next (EmpathyChatView *view,
		       const gchar     *search_criteria,
		       gboolean         new_search)
{
	/* Not implemented */
	return FALSE;
}

static void
theme_adium_find_abilities (EmpathyChatView *view,
			    const gchar    *search_criteria,
			    gboolean       *can_do_previous,
			    gboolean       *can_do_next)
{
	/* Not implemented */
}

static void
theme_adium_highlight (EmpathyChatView *view,
		       const gchar     *text)
{
	/* Not implemented */
}

static void
theme_adium_copy_clipboard (EmpathyChatView *view)
{
	/* Not implemented */
}

static void
theme_adium_iface_init (EmpathyChatViewIface *iface)
{
	iface->append_message = theme_adium_append_message;
	iface->append_event = theme_adium_append_event;
	iface->scroll = theme_adium_scroll;
	iface->scroll_down = theme_adium_scroll_down;
	iface->get_has_selection = theme_adium_get_has_selection;
	iface->clear = theme_adium_clear;
	iface->find_previous = theme_adium_find_previous;
	iface->find_next = theme_adium_find_next;
	iface->find_abilities = theme_adium_find_abilities;
	iface->highlight = theme_adium_highlight;
	iface->copy_clipboard = theme_adium_copy_clipboard;
}

static void
theme_adium_load_finished_cb (WebKitWebView  *view,
			      WebKitWebFrame *frame,
			      gpointer        user_data)
{
	EmpathyThemeAdiumPriv *priv = GET_PRIV (view);
	EmpathyChatView       *chat_view = EMPATHY_CHAT_VIEW (view);

	DEBUG ("Page loaded");
	priv->ready = TRUE;

	/* Display queued messages */
	priv->message_queue = g_list_reverse (priv->message_queue);
	while (priv->message_queue) {
		EmpathyMessage *message = priv->message_queue->data;

		theme_adium_append_message (chat_view, message);
		priv->message_queue = g_list_remove (priv->message_queue, message);
		g_object_unref (message);
	}
}

static void
theme_adium_finalize (GObject *object)
{
	EmpathyThemeAdiumPriv *priv = GET_PRIV (object);

	g_free (priv->in_content_html);
	g_free (priv->in_nextcontent_html);
	g_free (priv->out_content_html);
	g_free (priv->out_nextcontent_html);
	g_free (priv->default_avatar_filename);

	if (priv->last_contact) {
		g_object_unref (priv->last_contact);
	}

	G_OBJECT_CLASS (empathy_theme_adium_parent_class)->finalize (object);
}

static void
empathy_theme_adium_class_init (EmpathyThemeAdiumClass *klass)
{
	GObjectClass *object_class = G_OBJECT_CLASS (klass);
	
	object_class->finalize = theme_adium_finalize;

	g_type_class_add_private (object_class, sizeof (EmpathyThemeAdiumPriv));
}

static void
empathy_theme_adium_init (EmpathyThemeAdium *theme)
{
	EmpathyThemeAdiumPriv *priv = G_TYPE_INSTANCE_GET_PRIVATE (theme,
		EMPATHY_TYPE_THEME_ADIUM, EmpathyThemeAdiumPriv);

	theme->priv = priv;	

	theme_adium_load (theme);

	g_signal_connect (theme, "load-finished",
			  G_CALLBACK (theme_adium_load_finished_cb),
			  NULL);
}

EmpathyThemeAdium *
empathy_theme_adium_new (void)
{
	return g_object_new (EMPATHY_TYPE_THEME_ADIUM, NULL);
}