/*
 * e-mail-parser-message-external.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 "e-mail-format-extensions.h"

#include <em-format/e-mail-parser-extension.h>
#include <em-format/e-mail-parser.h>
#include <e-util/e-util.h>

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

#include <string.h>
#include <ctype.h>

typedef struct _EMailParserMessageExternal {
	GObject parent;
} EMailParserMessageExternal;

typedef struct _EMailParserMessageExternalClass {
	GObjectClass parent_class;
} EMailParserMessageExternalClass;

static void e_mail_parser_parser_extension_interface_init (EMailParserExtensionInterface *iface);
static void e_mail_parser_mail_extension_interface_init (EMailExtensionInterface *iface);

G_DEFINE_TYPE_EXTENDED (
	EMailParserMessageExternal,
	e_mail_parser_message_external,
	G_TYPE_OBJECT,
	0,
	G_IMPLEMENT_INTERFACE (
		E_TYPE_MAIL_EXTENSION,
		e_mail_parser_mail_extension_interface_init)
	G_IMPLEMENT_INTERFACE (
		E_TYPE_MAIL_PARSER_EXTENSION,
		e_mail_parser_parser_extension_interface_init));

static const gchar* parser_mime_types[] = { "message/external-body",
					    NULL };

static GSList *
empe_msg_external_parse (EMailParserExtension *extension,
                         EMailParser *parser,
                         CamelMimePart *part,
                         GString *part_id,
                         GCancellable *cancellable)
{
	EMailPart *mail_part;
	CamelMimePart *newpart;
	CamelContentType *type;
	const gchar *access_type;
	gchar *url = NULL, *desc = NULL;
	gchar *content;
	gint len;
	gchar *mime_type;

	if (g_cancellable_is_cancelled (cancellable))
		return NULL;

	newpart = camel_mime_part_new ();

	/* needs to be cleaner */
	type = camel_mime_part_get_content_type (part);
	access_type = camel_content_type_param (type, "access-type");
	if (!access_type) {
		const gchar *msg = _("Malformed external-body part");
		mime_type = g_strdup ("text/plain");
		camel_mime_part_set_content (newpart, msg, strlen (msg), mime_type);
		goto addPart;
	}

	if (!g_ascii_strcasecmp(access_type, "ftp") ||
	    !g_ascii_strcasecmp(access_type, "anon-ftp")) {
		const gchar *name, *site, *dir, *mode;
		gchar *path;
		gchar ftype[16];

		name = camel_content_type_param (type, "name");
		site = camel_content_type_param (type, "site");
		dir = camel_content_type_param (type, "directory");
		mode = camel_content_type_param (type, "mode");
		if (name == NULL || site == NULL)
			goto fail;

		/* Generate the path. */
		if (dir)
			path = g_strdup_printf("/%s/%s", *dir=='/'?dir+1:dir, name);
		else
			path = g_strdup_printf("/%s", *name=='/'?name+1:name);

		if (mode && *mode)
			sprintf(ftype, ";type=%c",  *mode);
		else
			ftype[0] = 0;

		url = g_strdup_printf ("ftp://%s%s%s", site, path, ftype);
		g_free (path);
		desc = g_strdup_printf (_("Pointer to FTP site (%s)"), url);
	} else if (!g_ascii_strcasecmp (access_type, "local-file")) {
		const gchar *name, *site;

		name = camel_content_type_param (type, "name");
		site = camel_content_type_param (type, "site");
		if (name == NULL)
			goto fail;

		url = g_filename_to_uri (name, NULL, NULL);
		if (site)
			desc = g_strdup_printf(_("Pointer to local file (%s) valid at site \"%s\""), name, site);
		else
			desc = g_strdup_printf(_("Pointer to local file (%s)"), name);
	} else if (!g_ascii_strcasecmp (access_type, "URL")) {
		const gchar *urlparam;
		gchar *s, *d;

		/* RFC 2017 */
		urlparam = camel_content_type_param (type, "url");
		if (urlparam == NULL)
			goto fail;

		/* For obscure MIMEy reasons, the URL may be split into words */
		url = g_strdup (urlparam);
		s = d = url;
		while (*s) {
			if (!isspace ((guchar) * s))
				*d++ = *s;
			s++;
		}
		*d = 0;
		desc = g_strdup_printf (_("Pointer to remote data (%s)"), url);
	} else {
		goto fail;
	}

	mime_type = g_strdup ("text/html");
	content = g_strdup_printf ("<a href=\"%s\">%s</a>", url, desc);
	camel_mime_part_set_content (newpart, content, strlen (content), mime_type);
	g_free (content);

	g_free (url);
	g_free (desc);

	goto addPart;

fail:
	content = g_strdup_printf (
		_("Pointer to unknown external data (\"%s\" type)"),
		access_type);
	mime_type = g_strdup ("text/plain");
	camel_mime_part_set_content (newpart, content, strlen (content), mime_type);
	g_free (content);

addPart:
	len = part_id->len;
	g_string_append (part_id, ".msg_external");
	mail_part = e_mail_part_new (part, part_id->str);
	mail_part->mime_type = mime_type;
	g_string_truncate (part_id, len);

	return g_slist_append (NULL, mail_part);
}

static const gchar **
empe_msg_external_mime_types (EMailExtension *extension)
{
	return parser_mime_types;
}

static void
e_mail_parser_message_external_class_init (EMailParserMessageExternalClass *class)
{
}

static void
e_mail_parser_parser_extension_interface_init (EMailParserExtensionInterface *iface)
{
	iface->parse = empe_msg_external_parse;
}

static void
e_mail_parser_mail_extension_interface_init (EMailExtensionInterface *iface)
{
	iface->mime_types = empe_msg_external_mime_types;
}

static void
e_mail_parser_message_external_init (EMailParserMessageExternal *parser)
{

}