/*
 * 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/>
 *
 *
 * Authors:
 *		Iain Holmes <iain@ximian.com>
 *      Michael Zucchi <notzed@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

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

#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>

#include <glib/gstdio.h>
#include <glib/gi18n.h>

#include "e-util/e-util-private.h"
#include "shell/e-shell-backend.h"

#include "libemail-utils/mail-mt.h"
#include "libemail-engine/mail-tools.h"
#include "libemail-engine/e-mail-session.h"

#include "mail-importer.h"

struct _import_mbox_msg {
	MailMsg base;

	EMailSession *session;
	gchar *path;
	gchar *uri;
	GCancellable *cancellable;

	void (*done)(gpointer data, GError **error);
	gpointer done_data;
};

static gchar *
import_mbox_desc (struct _import_mbox_msg *m)
{
	return g_strdup (_("Importing mailbox"));
}

static struct {
	gchar tag;
	guint32 mozflag;
	guint32 flag;
} status_flags[] = {
	{ 'F', MSG_FLAG_MARKED, CAMEL_MESSAGE_FLAGGED },
	{ 'A', MSG_FLAG_REPLIED, CAMEL_MESSAGE_ANSWERED },
	{ 'D', MSG_FLAG_EXPUNGED, CAMEL_MESSAGE_DELETED },
	{ 'R', MSG_FLAG_READ, CAMEL_MESSAGE_SEEN },
};

static guint32
decode_status (const gchar *status)
{
	const gchar *p;
	guint32 flags = 0;
	gint i;

	p = status;
	while ((*p++)) {
		for (i = 0; i < G_N_ELEMENTS (status_flags); i++)
			if (status_flags[i].tag == *p)
				flags |= status_flags[i].flag;
	}

	return flags;
}

static guint32
decode_mozilla_status (const gchar *tmp)
{
	gulong status = strtoul (tmp, NULL, 16);
	guint32 flags = 0;
	gint i;

	for (i = 0; i < G_N_ELEMENTS (status_flags); i++)
		if (status_flags[i].mozflag & status)
			flags |= status_flags[i].flag;
	return flags;
}

static void
import_mbox_exec (struct _import_mbox_msg *m,
                  GCancellable *cancellable,
                  GError **error)
{
	CamelFolder *folder;
	CamelMimeParser *mp = NULL;
	struct stat st;
	gint fd;
	CamelMessageInfo *info;

	if (g_stat (m->path, &st) == -1) {
		g_warning (
			"cannot find source file to import '%s': %s",
			m->path, g_strerror (errno));
		return;
	}

	if (m->uri == NULL || m->uri[0] == 0)
		folder = e_mail_session_get_local_folder (
			m->session, E_MAIL_LOCAL_FOLDER_INBOX);
	else
		folder = e_mail_session_uri_to_folder_sync (
			m->session, m->uri, CAMEL_STORE_FOLDER_CREATE,
			cancellable, error);

	if (folder == NULL)
		return;

	if (S_ISREG (st.st_mode)) {
		fd = g_open (m->path, O_RDONLY | O_BINARY, 0);
		if (fd == -1) {
			g_warning (
				"cannot find source file to import '%s': %s",
				m->path, g_strerror (errno));
			goto fail1;
		}

		mp = camel_mime_parser_new ();
		camel_mime_parser_scan_from (mp, TRUE);
		if (camel_mime_parser_init_with_fd (mp, fd) == -1) {
			/* will never happen - 0 is unconditionally returned */
			goto fail2;
		}

		camel_operation_push_message (
			m->cancellable, _("Importing '%s'"),
			camel_folder_get_full_name (folder));
		camel_folder_freeze (folder);
		while (camel_mime_parser_step (mp, NULL, NULL) ==
				CAMEL_MIME_PARSER_STATE_FROM) {

			CamelMimeMessage *msg;
			const gchar *tmp;
			gint pc = 0;
			guint32 flags = 0;

			if (st.st_size > 0)
				pc = (gint) (100.0 * ((gdouble)
					camel_mime_parser_tell (mp) /
					(gdouble) st.st_size));
			camel_operation_progress (m->cancellable, pc);

			msg = camel_mime_message_new ();
			if (!camel_mime_part_construct_from_parser_sync (
				(CamelMimePart *) msg, mp, NULL, NULL)) {
				/* set exception? */
				g_object_unref (msg);
				break;
			}

			info = camel_message_info_new (NULL);

			tmp = camel_medium_get_header((CamelMedium *)msg, "X-Mozilla-Status");
			if (tmp)
				flags |= decode_mozilla_status (tmp);
			tmp = camel_medium_get_header((CamelMedium *)msg, "Status");
			if (tmp)
				flags |= decode_status (tmp);
			tmp = camel_medium_get_header((CamelMedium *)msg, "X-Status");
			if (tmp)
				flags |= decode_status (tmp);

			camel_message_info_set_flags (info, flags, ~0);
			camel_folder_append_message_sync (
				folder, msg, info, NULL,
				cancellable, error);
			camel_message_info_free (info);
			g_object_unref (msg);

			if (error && *error != NULL)
				break;

			camel_mime_parser_step (mp, NULL, NULL);
		}
		/* FIXME Not passing a GCancellable or GError here. */
		camel_folder_synchronize_sync (folder, FALSE, NULL, NULL);
		camel_folder_thaw (folder);
		camel_operation_pop_message (m->cancellable);
	fail2:
		g_object_unref (mp);
	}
fail1:
	/* FIXME Not passing a GCancellable or GError here. */
	camel_folder_synchronize_sync (folder, FALSE, NULL, NULL);
	g_object_unref (folder);
}

static void
import_mbox_done (struct _import_mbox_msg *m)
{
	if (m->done)
		m->done (m->done_data, &m->base.error);
}

static void
import_mbox_free (struct _import_mbox_msg *m)
{
	g_object_unref (m->session);
	if (m->cancellable)
		g_object_unref (m->cancellable);
	g_free (m->uri);
	g_free (m->path);
}

static MailMsgInfo import_mbox_info = {
	sizeof (struct _import_mbox_msg),
	(MailMsgDescFunc) import_mbox_desc,
	(MailMsgExecFunc) import_mbox_exec,
	(MailMsgDoneFunc) import_mbox_done,
	(MailMsgFreeFunc) import_mbox_free
};

gint
mail_importer_import_mbox (EMailSession *session,
                           const gchar *path,
                           const gchar *folderuri,
                           GCancellable *cancellable,
                           void (*done) (gpointer data,
                                         GError **error),
                           gpointer data)
{
	struct _import_mbox_msg *m;
	gint id;

	m = mail_msg_new (&import_mbox_info);
	m->session = g_object_ref (session);
	m->path = g_strdup (path);
	m->uri = g_strdup (folderuri);
	m->done = done;
	m->done_data = data;
	if (cancellable)
		m->cancellable = g_object_ref (cancellable);

	id = m->base.seq;
	mail_msg_fast_ordered_push (m);

	return id;
}

void
mail_importer_import_mbox_sync (EMailSession *session,
                                const gchar *path,
                                const gchar *folderuri,
                                GCancellable *cancellable)
{
	struct _import_mbox_msg *m;

	m = mail_msg_new (&import_mbox_info);
	m->session = g_object_ref (session);
	m->path = g_strdup (path);
	m->uri = g_strdup (folderuri);
	if (cancellable)
		m->base.cancellable = cancellable;

	cancellable = m->base.cancellable;

	import_mbox_exec (m, cancellable, &m->base.error);
	import_mbox_done (m);
	mail_msg_unref (m);
}

struct _import_folders_data {
	MailImporterSpecial *special_folders;
	EMailSession *session;
	GCancellable *cancellable;

	guint elmfmt : 1;
};

static void
import_folders_rec (struct _import_folders_data *m,
                    const gchar *filepath,
                    const gchar *folderparent)
{
	GDir *dir;
	const gchar *d;
	struct stat st;
	const gchar *data_dir;
	gchar *filefull, *foldersub, *uri, *utf8_filename;
	const gchar *folder;

	dir = g_dir_open (filepath, 0, NULL);
	if (dir == NULL)
		return;

	data_dir = mail_session_get_data_dir ();

	utf8_filename = g_filename_to_utf8 (filepath, -1, NULL, NULL, NULL);
	camel_operation_push_message (m->cancellable, _("Scanning %s"), utf8_filename);
	g_free (utf8_filename);

	while ( (d = g_dir_read_name (dir))) {
		if (d[0] == '.')
			continue;

		filefull = g_build_filename (filepath, d, NULL);

		/* skip non files and directories, and skip directories in mozilla mode */
		if (g_stat (filefull, &st) == -1
		    || !(S_ISREG (st.st_mode)
			 || (m->elmfmt && S_ISDIR (st.st_mode)))) {
			g_free (filefull);
			continue;
		}

		folder = d;
		if (folderparent == NULL) {
			gint i;

			for (i = 0; m->special_folders[i].orig; i++)
				if (strcmp (m->special_folders[i].orig, folder) == 0) {
					folder = m->special_folders[i].new;
					break;
				}
			/* FIXME: need a better way to get default store location */
			uri = g_strdup_printf (
				"mbox:%s/local#%s", data_dir, folder);
		} else {
			uri = g_strdup_printf (
				"mbox:%s/local#%s/%s",
				data_dir, folderparent, folder);
		}

		printf("importing to uri %s\n", uri);
		mail_importer_import_mbox_sync (
			m->session, filefull, uri, m->cancellable);
		g_free (uri);

		/* This little gem re-uses the stat buffer and filefull
		 * to automagically scan mozilla-format folders. */
		if (!m->elmfmt) {
			gchar *tmp = g_strdup_printf("%s.sbd", filefull);

			g_free (filefull);
			filefull = tmp;
			if (g_stat (filefull, &st) == -1) {
				g_free (filefull);
				continue;
			}
		}

		if (S_ISDIR (st.st_mode)) {
			foldersub = folderparent ?
				g_strdup_printf (
					"%s/%s", folderparent, folder) :
				g_strdup (folder);
			import_folders_rec (m, filefull, foldersub);
			g_free (foldersub);
		}

		g_free (filefull);
	}
	g_dir_close (dir);

	camel_operation_pop_message (m->cancellable);
}

/**
 * mail_importer_import_folders_sync:
 * @filepath:
 * @:
 * @flags:
 * @cancel:
 *
 * import from a base path @filepath into the root local folder tree,
 * scanning all sub-folders.
 *
 * if @flags is MAIL_IMPORTER_MOZFMT, then subfolders are assumed to
 * be in mozilla/evolutoin 1.5 format, appending '.sbd' to the
 * directory name. Otherwise they are in elm/mutt/pine format, using
 * standard unix directories.
 **/
void
mail_importer_import_folders_sync (EMailSession *session,
                                   const gchar *filepath,
                                   MailImporterSpecial special_folders[],
                                   gint flags,
                                   GCancellable *cancellable)
{
	struct _import_folders_data m;

	m.special_folders = special_folders;
	m.elmfmt = (flags & MAIL_IMPORTER_MOZFMT) == 0;
	m.session = g_object_ref (session);
	m.cancellable = cancellable;

	import_folders_rec (&m, filepath, NULL);
}