/*
 * e-mail-config-web-view.c
 *
 * This program 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) version 3.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdio.h>
#include <string.h>

#include "e-mail-config-web-view-gtkhtml.h"

#include <shell/e-shell.h>

#define E_MAIL_CONFIG_WEB_VIEW_GTKHTML_GET_PRIVATE(obj) \
	(G_TYPE_INSTANCE_GET_PRIVATE \
	((obj), E_TYPE_MAIL_CONFIG_WEB_VIEW_GTKHTML, EMailConfigWebViewGtkHTMLPrivate))

struct _EMailConfigWebViewGtkHTMLPrivate {
	GtkCssProvider *css_provider;
	EShellSettings *shell_settings;
};

G_DEFINE_DYNAMIC_TYPE (
	EMailConfigWebViewGtkHTML,
	e_mail_config_web_view_gtkhtml,
	E_TYPE_EXTENSION)

/* replaces content of color string */
static void
mail_config_web_view_gtkhtml_fix_color_string (gchar *color_string)
{
	GdkColor color;

	if (color_string == NULL)
		return;

	if (strlen (color_string) < 13)
		return;

	if (!gdk_color_parse (color_string, &color))
		return;

	sprintf (
		color_string, "#%02x%02x%02x",
		(gint) color.red * 256 / 65536,
		(gint) color.green * 256 / 65536,
		(gint) color.blue * 256 / 65536);
}

static void
mail_config_web_view_gtkhtml_load_style (EMailConfigWebViewGtkHTML *extension)
{
	GString *buffer;
	gchar *citation_color;
	gchar *monospace_font;
	gchar *spell_color;
	gchar *variable_font;
	gboolean custom_fonts;
	gboolean mark_citations;
	EExtensible *extensible;
	EShellSettings *shell_settings;
	GtkStyleContext *style_context;
	GError *error = NULL;

	/* Some of our mail and composer preferences are passed down to
	 * GtkHtml through style properties, unfortunately.  This builds
	 * a style sheet for the EWebView using values from GSettings. */

	shell_settings = extension->priv->shell_settings;

	custom_fonts = e_shell_settings_get_boolean (
		shell_settings, "mail-use-custom-fonts");

	monospace_font = e_shell_settings_get_string (
		shell_settings, "mail-font-monospace");

	variable_font = e_shell_settings_get_string (
		shell_settings, "mail-font-variable");

	mark_citations = e_shell_settings_get_boolean (
		shell_settings, "mail-mark-citations");

	citation_color = e_shell_settings_get_string (
		shell_settings, "mail-citation-color");

	spell_color = e_shell_settings_get_string (
		shell_settings, "composer-spell-color");

	buffer = g_string_new ("EWebViewGtkHTML {\n");

	mail_config_web_view_gtkhtml_fix_color_string (citation_color);
	mail_config_web_view_gtkhtml_fix_color_string (spell_color);

	if (custom_fonts && variable_font != NULL)
		g_string_append_printf (
			buffer, "  font: %s;\n", variable_font);

	if (custom_fonts && monospace_font != NULL)
		g_string_append_printf (
			buffer, "  -GtkHTML-fixed-font-name: '%s';\n",
			monospace_font);

	if (mark_citations && citation_color != NULL)
		g_string_append_printf (
			buffer, "  -GtkHTML-cite-color: %s;\n",
			citation_color);

	if (spell_color != NULL)
		g_string_append_printf (
			buffer, "  -GtkHTML-spell-error-color: %s;\n",
			spell_color);

	g_string_append (buffer, "}\n");

	gtk_css_provider_load_from_data (
		extension->priv->css_provider,
		buffer->str, buffer->len, &error);

	if (error != NULL) {
		g_warning ("%s", error->message);
		g_error_free (error);
	}

	g_string_free (buffer, TRUE);

	g_free (monospace_font);
	g_free (variable_font);
	g_free (citation_color);
	g_free (spell_color);

	extensible = e_extension_get_extensible (E_EXTENSION (extension));
	style_context = gtk_widget_get_style_context (GTK_WIDGET (extensible));
	gtk_style_context_invalidate (style_context);
}

static void
mail_config_web_view_gtkhtml_realize (GtkWidget *widget,
                                      EMailConfigWebViewGtkHTML *extension)
{
	EShellSettings *shell_settings;

	shell_settings = extension->priv->shell_settings;

	g_object_bind_property (
		shell_settings, "composer-inline-spelling",
		widget, "inline-spelling",
		G_BINDING_SYNC_CREATE);

	g_object_bind_property (
		shell_settings, "composer-magic-links",
		widget, "magic-links",
		G_BINDING_SYNC_CREATE);

	g_object_bind_property (
		shell_settings, "composer-magic-smileys",
		widget, "magic-smileys",
		G_BINDING_SYNC_CREATE);

	gtk_style_context_add_provider (
		gtk_widget_get_style_context (widget),
		GTK_STYLE_PROVIDER (extension->priv->css_provider),
		GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);

	mail_config_web_view_gtkhtml_load_style (extension);

	/* Reload the style sheet when certain settings change. */

	g_signal_connect_swapped (
		shell_settings, "notify::mail-use-custom-fonts",
		G_CALLBACK (mail_config_web_view_gtkhtml_load_style),
		extension);

	g_signal_connect_swapped (
		shell_settings, "notify::mail-font-monospace",
		G_CALLBACK (mail_config_web_view_gtkhtml_load_style),
		extension);

	g_signal_connect_swapped (
		shell_settings, "notify::mail-font-variable",
		G_CALLBACK (mail_config_web_view_gtkhtml_load_style),
		extension);

	g_signal_connect_swapped (
		shell_settings, "notify::mail-mark-citations",
		G_CALLBACK (mail_config_web_view_gtkhtml_load_style),
		extension);

	g_signal_connect_swapped (
		shell_settings, "notify::mail-citation-color",
		G_CALLBACK (mail_config_web_view_gtkhtml_load_style),
		extension);

	g_signal_connect_swapped (
		shell_settings, "notify::composer-spell-color",
		G_CALLBACK (mail_config_web_view_gtkhtml_load_style),
		extension);
}

static void
mail_config_web_view_gtkhtml_dispose (GObject *object)
{
	EMailConfigWebViewGtkHTMLPrivate *priv;

	priv = E_MAIL_CONFIG_WEB_VIEW_GTKHTML_GET_PRIVATE (object);

	if (priv->css_provider != NULL) {
		g_object_unref (priv->css_provider);
		priv->css_provider = NULL;
	}

	if (priv->shell_settings != NULL) {
		g_signal_handlers_disconnect_by_func (
			priv->shell_settings,
			mail_config_web_view_gtkhtml_load_style, object);
		g_object_unref (priv->shell_settings);
		priv->shell_settings = NULL;
	}

	/* Chain up to parent's dispose() method. */
	G_OBJECT_CLASS (e_mail_config_web_view_gtkhtml_parent_class)->
		dispose (object);
}

static void
mail_config_web_view_gtkhtml_constructed (GObject *object)
{
	EShell *shell;
	EShellSettings *shell_settings;
	EMailConfigWebViewGtkHTML *extension;
	EExtensible *extensible;

	shell = e_shell_get_default ();
	shell_settings = e_shell_get_shell_settings (shell);

	extension = (EMailConfigWebViewGtkHTML *) object;
	extensible = e_extension_get_extensible (E_EXTENSION (extension));

	extension->priv->css_provider = gtk_css_provider_new ();
	extension->priv->shell_settings = g_object_ref (shell_settings);

	/* Wait to bind shell settings until the EWebView is realized
	 * so GtkhtmlEditor has a chance to install a GtkHTMLEditorAPI.
	 * Otherwise our settings will have no effect. */

	g_signal_connect (
		extensible, "realize",
		G_CALLBACK (mail_config_web_view_gtkhtml_realize), extension);

	/* Chain up to parent's constructed() method. */
	G_OBJECT_CLASS (e_mail_config_web_view_gtkhtml_parent_class)->
		constructed (object);
}

static void
e_mail_config_web_view_gtkhtml_class_init (EMailConfigWebViewGtkHTMLClass *class)
{
	GObjectClass *object_class;
	EExtensionClass *extension_class;

	g_type_class_add_private (
		class, sizeof (EMailConfigWebViewGtkHTMLPrivate));

	object_class = G_OBJECT_CLASS (class);
	object_class->dispose = mail_config_web_view_gtkhtml_dispose;
	object_class->constructed = mail_config_web_view_gtkhtml_constructed;

	extension_class = E_EXTENSION_CLASS (class);
	extension_class->extensible_type = E_TYPE_WEB_VIEW_GTKHTML;
}

static void
e_mail_config_web_view_gtkhtml_class_finalize (EMailConfigWebViewGtkHTMLClass *class)
{
}

static void
e_mail_config_web_view_gtkhtml_init (EMailConfigWebViewGtkHTML *extension)
{
	extension->priv =
		E_MAIL_CONFIG_WEB_VIEW_GTKHTML_GET_PRIVATE (extension);
}

void
e_mail_config_web_view_gtkhtml_type_register (GTypeModule *type_module)
{
	/* XXX G_DEFINE_DYNAMIC_TYPE declares a static type registration
	 *     function, so we have to wrap it with a public function in
	 *     order to register types from a separate compilation unit. */
	e_mail_config_web_view_gtkhtml_register_type (type_module);
}