/* Copyright (c) 2006, Nokia Corporation
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * * Neither the name of the Nokia Corporation nor the names of its
 *   contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <string.h>
#include <gtkhtml/gtkhtml.h>
#include <tny-gtk-text-buffer-stream.h>
#include <tny-simple-list.h>
#include <tny-folder.h>
#include <modest-runtime.h>
#include <modest-defs.h>
#include "modest-formatter.h"
#include <tny-camel-mem-stream.h>
#include <tny-camel-mime-part.h>
#include <glib/gprintf.h>
#include <modest-tny-folder.h>
#include "modest-tny-mime-part.h"
#include <modest-error.h>


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

#include <modest-tny-msg.h>
#include "modest-text-utils.h"

static TnyMimePart * add_body_part (TnyMsg *msg, const gchar *body,
				    const gchar *content_type);
static TnyMimePart * add_html_body_part (TnyMsg *msg, const gchar *body);
static gint add_attachments (TnyMimePart *part, GList *attachments_list, gboolean add_inline, GError **err);
static void add_images (TnyMsg *msg, GList *attachments_list, GError **err);
static char * get_content_type(const gchar *s);
static gboolean is_ascii(const gchar *s);

static TnyMimePart* modest_tny_msg_find_body_part_from_mime_part (TnyMimePart *msg, gboolean want_html);
static TnyMimePart* modest_tny_msg_find_calendar_from_mime_part  (TnyMimePart *msg);

static void
add_header_pairs (TnyMimePart *part, TnyList *header_pairs)
{
	TnyIterator *iterator;

	iterator = tny_list_create_iterator (header_pairs);
	while (!tny_iterator_is_done (iterator)) {
		TnyPair *current = (TnyPair *) tny_iterator_get_current (iterator);
		tny_mime_part_set_header_pair (part, tny_pair_get_name (current), tny_pair_get_value (current));
		g_object_unref (current);
		tny_iterator_next (iterator);
	}
	g_object_unref (iterator);
}

TnyMsg*
modest_tny_msg_new (const gchar* mailto, const gchar* from, const gchar *cc,
		    const gchar *bcc, const gchar* subject,
		    const gchar *references, const gchar *in_reply_to,
		    const gchar *body,
		    GList *attachments, gint *attached, TnyList *header_pairs, GError **err)
{
	TnyMsg *new_msg;
	TnyHeader *header;
	gchar *content_type;
	gint tmp_attached = 0;

	/* Create new msg */
	new_msg = modest_formatter_create_message (NULL, TRUE, (attachments != NULL), FALSE);
	add_header_pairs (TNY_MIME_PART (new_msg), header_pairs);
	header  = tny_msg_get_header (new_msg);

	if ((from != NULL) && (strlen(from) > 0)) {
		tny_header_set_from (TNY_HEADER (header), from);
		tny_header_set_replyto (TNY_HEADER (header), from);
	}
	if ((mailto != NULL) && (strlen(mailto) > 0)) {
		gchar *removed_to = modest_text_utils_remove_duplicate_addresses (mailto);
		tny_header_set_to (TNY_HEADER (header), removed_to);
		g_free (removed_to);
	}
	if ((cc != NULL) && (strlen(cc) > 0))
		tny_header_set_cc (TNY_HEADER (header), cc);
	if ((bcc != NULL) && (strlen(bcc) > 0))
		tny_header_set_bcc (TNY_HEADER (header), bcc);

	if ((subject != NULL) && (strlen(subject) > 0))
		tny_header_set_subject (TNY_HEADER (header), subject);

	content_type = get_content_type(body);

	/* set modest as the X-Mailer
	 * we could this in the platform factory, but then the header
	 * would show up before all the others.
	 */
	tny_mime_part_set_header_pair (TNY_MIME_PART (new_msg), "X-Mailer", "Modest "
				       VERSION);

	if (references)
		tny_mime_part_set_header_pair (TNY_MIME_PART (new_msg), "References", references);

	if (in_reply_to)
		tny_mime_part_set_header_pair (TNY_MIME_PART (new_msg), "In-Reply-To", in_reply_to);

	/* Add the body of the new mail */
	/* This is needed even if body is NULL or empty. */
	add_body_part (new_msg, body, content_type);
	g_free (content_type);

	/* Add attachments */
	if (attachments)
		tmp_attached = add_attachments (TNY_MIME_PART (new_msg), attachments, FALSE, err);
	if (attached)
		*attached = tmp_attached;
	if (header)
		g_object_unref(header);

	return new_msg;
}

TnyMsg*
modest_tny_msg_new_html_plain (const gchar* mailto, const gchar* from, const gchar *cc,
			       const gchar *bcc, const gchar* subject, 
			       const gchar *references, const gchar *in_reply_to,
			       const gchar *html_body, const gchar *plain_body,
			       GList *attachments, GList *images, gint *attached, TnyList *header_pairs, GError **err)
{
	TnyMsg *new_msg;
	TnyHeader *header;
	gchar *content_type;
	gint tmp_attached;
	
	/* Create new msg */
	new_msg = modest_formatter_create_message (NULL, FALSE, (attachments != NULL), (images != NULL));
	add_header_pairs (TNY_MIME_PART (new_msg), header_pairs);
	header  = tny_msg_get_header (new_msg);
	
	if ((from != NULL) && (strlen(from) > 0)) {
		tny_header_set_from (TNY_HEADER (header), from);
		tny_header_set_replyto (TNY_HEADER (header), from);
	}
	if ((mailto != NULL) && (strlen(mailto) > 0)) 
		tny_header_set_to (TNY_HEADER (header), mailto);
	if ((cc != NULL) && (strlen(cc) > 0)) 
		tny_header_set_cc (TNY_HEADER (header), cc);
	if ((bcc != NULL) && (strlen(bcc) > 0)) 
		tny_header_set_bcc (TNY_HEADER (header), bcc);
	
	if ((subject != NULL) && (strlen(subject) > 0)) 
		tny_header_set_subject (TNY_HEADER (header), subject);

	content_type = get_content_type(plain_body);
	
	/* set modest as the X-Mailer
	 * we could this in the platform factory, but then the header
	 * would show up before all the others.
	 */
	tny_mime_part_set_header_pair (TNY_MIME_PART (new_msg), "X-Mailer", "Modest "
				       VERSION);

	if (references)
		tny_mime_part_set_header_pair (TNY_MIME_PART (new_msg), "References", references);

	if (in_reply_to)
		tny_mime_part_set_header_pair (TNY_MIME_PART (new_msg), "In-Reply-To", in_reply_to);

	/* Add the body of the new mail */
	add_body_part (new_msg, plain_body, content_type);
	add_html_body_part (new_msg, html_body);
	g_free (content_type);

	/* Add attachments */
	tmp_attached = add_attachments (TNY_MIME_PART (new_msg), attachments, FALSE, err);
	if (attached)
		*attached = tmp_attached;
	add_images (new_msg, images, err);
	if (header)
		g_object_unref(header);

	return new_msg;
}


/* FIXME: this func copy from modest-mail-operation: refactor */
static TnyMimePart *
add_body_part (TnyMsg *msg, 
	       const gchar *body,
	       const gchar *content_type)
{
	TnyMimePart *text_body_part = NULL;
	TnyStream *text_body_stream;

	/* Create the stream */
	text_body_stream = TNY_STREAM (tny_camel_mem_stream_new_with_buffer
					(body, (body ? strlen(body) : 0)));

	text_body_part = modest_formatter_create_body_part (NULL, msg);

	/* Construct MIME part */
	tny_stream_reset (text_body_stream);
	tny_mime_part_construct (text_body_part,
				 text_body_stream,
				 content_type, "7bit");
	tny_stream_reset (text_body_stream);

	g_object_unref (G_OBJECT(text_body_part));

	/* Clean */
	g_object_unref (text_body_stream);

	return text_body_part;
}

static TnyMimePart *
add_html_body_part (TnyMsg *msg, 
		    const gchar *body)
{
	TnyMimePart *html_body_part = NULL;
	TnyStream *html_body_stream;

	/* Create the stream */
	html_body_stream = TNY_STREAM (tny_camel_mem_stream_new_with_buffer
				       (body, (body) ? strlen(body) : 0));

	/* Create body part if needed */
	html_body_part = modest_formatter_create_body_part (NULL, msg);

	/* Construct MIME part */
	tny_stream_reset (html_body_stream);
	tny_mime_part_construct (html_body_part,
			         html_body_stream,
			         "text/html; charset=utf-8", 
			         "7bit"); /* Sometimes it might be needed 
					     to make this one a 8bit! */
	tny_stream_reset (html_body_stream);

	g_object_unref (G_OBJECT(html_body_part));

	/* Clean */
	g_object_unref (html_body_stream);

	return html_body_part;
}

static TnyMimePart *
copy_mime_part (TnyMimePart *part, GError **err)
{
	TnyMimePart *result = NULL;
	const gchar *attachment_content_type;
	const gchar *attachment_filename;
	const gchar *attachment_cid;
	TnyList *parts;
	TnyIterator *iterator;
	TnyStream *attachment_stream;
	const gchar *enc;
	gint ret;
	
	if (TNY_IS_MSG (part)) {
		g_object_ref (part);
		return part;
	}

	result = tny_platform_factory_new_mime_part (
		modest_runtime_get_platform_factory());

	attachment_content_type = tny_mime_part_get_content_type (part);

	/* get mime part headers */
	attachment_filename = tny_mime_part_get_filename (part);
	attachment_cid = tny_mime_part_get_content_id (part);
	
	/* fill the stream */
 	attachment_stream = tny_mime_part_get_decoded_stream (part);
	enc = tny_mime_part_get_transfer_encoding (part);
	if (attachment_stream == NULL) {
		if (err != NULL && *err == NULL)
			g_set_error (err, MODEST_MAIL_OPERATION_ERROR, MODEST_MAIL_OPERATION_ERROR_FILE_IO, _("TODO: couldn't retrieve attachment"));
		g_object_unref (result);
		return NULL;
	} else {
		ret = tny_stream_reset (attachment_stream);
		ret = tny_mime_part_construct (result,
					       attachment_stream,
					       attachment_content_type, 
					       enc);
		ret = tny_stream_reset (attachment_stream);
	}
	
	/* set other mime part fields */
	tny_mime_part_set_filename (result, attachment_filename);
	tny_mime_part_set_content_id (result, attachment_cid);

	/* copy subparts */
	parts = tny_simple_list_new ();
	tny_mime_part_get_parts (part, parts);
	iterator = tny_list_create_iterator (parts);
	while (!tny_iterator_is_done (iterator)) {
		TnyMimePart *subpart = TNY_MIME_PART (tny_iterator_get_current (iterator));
		if (subpart) {
			const gchar *subpart_cid;
			TnyMimePart *subpart_copy = copy_mime_part (subpart, err);
			if (subpart_copy != NULL) {
				subpart_cid = tny_mime_part_get_content_id (subpart);
				tny_mime_part_add_part (result, subpart_copy);
				if (subpart_cid)
					tny_mime_part_set_content_id (result, subpart_cid);
				g_object_unref (subpart_copy);
			}
			g_object_unref (subpart);
		}

		tny_iterator_next (iterator);
	}
	g_object_unref (iterator);
	g_object_unref (parts);
	g_object_unref (attachment_stream);

	return result;
}

static gint
add_attachments (TnyMimePart *part, GList *attachments_list, gboolean add_inline, GError **err)
{
	GList *pos;
	TnyMimePart *attachment_part, *old_attachment;
	gint ret;
	gint attached = 0;

	for (pos = (GList *)attachments_list; pos; pos = pos->next) {

		old_attachment = pos->data;
		if (!tny_mime_part_is_purged (old_attachment)) {
			gchar *old_cid;
			old_cid = g_strdup (tny_mime_part_get_content_id (old_attachment));
			attachment_part = copy_mime_part (old_attachment, err);
			if (attachment_part != NULL) {
				if (add_inline) {
					tny_mime_part_set_header_pair (attachment_part, "Content-Disposition",
								       "inline");
				} else {
					const gchar *filename;

					filename = tny_mime_part_get_filename (old_attachment);
					if (filename) {
						/* If the mime part has a filename do not set it again
						   because Camel won't replace the old one. Instead it
						   will append the filename to the old one and that will
						   mislead email clients */
						if (!tny_mime_part_get_filename (attachment_part))
							tny_mime_part_set_filename (attachment_part, filename);
					} else {
						tny_mime_part_set_header_pair (attachment_part, "Content-Disposition",
									       "attachment");
					}
				}
				if (!TNY_IS_MSG (old_attachment))  {
					tny_mime_part_set_transfer_encoding (TNY_MIME_PART (attachment_part), "base64");
				}
				ret = tny_mime_part_add_part (TNY_MIME_PART (part), attachment_part);
				attached++;
				if (old_cid)
					tny_mime_part_set_content_id (attachment_part, old_cid);
				g_object_unref (attachment_part);
			}
			g_free (old_cid);
		}
	}
	return attached;
}

static void
add_images (TnyMsg *msg, GList *images_list, GError **err)
{
	TnyMimePart *related_part = NULL;
	const gchar *content_type;

	content_type = tny_mime_part_get_content_type (TNY_MIME_PART (msg));

	if ((content_type != NULL) && !strcasecmp (content_type, "multipart/related")) {
		related_part = g_object_ref (msg);
	} else if ((content_type != NULL) && !strcasecmp (content_type, "multipart/mixed")) {
		TnyList *parts = TNY_LIST (tny_simple_list_new ());
		TnyIterator *iter = NULL;
		tny_mime_part_get_parts (TNY_MIME_PART (msg), parts);
		iter = tny_list_create_iterator (parts);

		while (!tny_iterator_is_done (iter)) {
			TnyMimePart *part = TNY_MIME_PART (tny_iterator_get_current (iter));
			if (part && !g_ascii_strcasecmp (tny_mime_part_get_content_type (part), "multipart/related")) {
				related_part = part;
				break;
			}
			if (part)
				g_object_unref (part);
			tny_iterator_next (iter);
		}
		g_object_unref (iter);
		g_object_unref (parts);
	}

	if (related_part != NULL) {
		/* TODO: attach images in their proper place */
		add_attachments (related_part, images_list, TRUE, err);
		g_object_unref (related_part);
	}
}


gchar * 
modest_tny_msg_get_body (TnyMsg *msg, gboolean want_html, gboolean *is_html)
{
	TnyStream *stream;
	TnyMimePart *body;
	GtkTextBuffer *buf;
	GtkTextIter start, end;
	gchar *to_quote;
	gboolean result_was_html = TRUE;

	g_return_val_if_fail (msg && TNY_IS_MSG(msg), NULL);
	
	body = modest_tny_msg_find_body_part(msg, want_html);
	if (!body)
		return NULL;

	buf = gtk_text_buffer_new (NULL);
	stream = TNY_STREAM (tny_gtk_text_buffer_stream_new (buf));
	tny_stream_reset (stream);
	tny_mime_part_decode_to_stream (body, stream, NULL);
	tny_stream_reset (stream);
	
	gtk_text_buffer_get_bounds (buf, &start, &end);
	to_quote = gtk_text_buffer_get_text (buf, &start, &end, FALSE);
	if (tny_mime_part_content_type_is (body, "text/plain")) {
		gchar *to_quote_converted = modest_text_utils_convert_to_html (to_quote);
		g_free (to_quote);
		to_quote = to_quote_converted;
		result_was_html = FALSE;
	}

	g_object_unref (buf);
	g_object_unref (G_OBJECT(stream));
	g_object_unref (G_OBJECT(body));

	if (is_html != NULL)
		*is_html = result_was_html;

	return to_quote;
}


static TnyMimePart*
modest_tny_msg_find_body_part_in_alternative (TnyMimePart *msg, gboolean want_html)
{
	TnyList *parts;
	TnyIterator *iter;
	TnyMimePart *part = NULL, *related = NULL;
	TnyMimePart *first_part = NULL;
	const gchar *desired_mime_type = want_html ? "text/html" : "text/plain";

	parts = TNY_LIST (tny_simple_list_new());
	tny_mime_part_get_parts (TNY_MIME_PART (msg), parts);

	for (iter  = tny_list_create_iterator(parts);
	     !tny_iterator_is_done (iter);
	     tny_iterator_next (iter)) {
		gchar *content_type;
		gboolean is_body;

		part = TNY_MIME_PART (tny_iterator_get_current (iter));

		if (first_part == NULL) {
			g_object_ref (part);
			first_part = part;
		}

		is_body = FALSE;
		content_type = g_ascii_strdown (tny_mime_part_get_content_type (part), -1);
		is_body = g_str_has_prefix (content_type, desired_mime_type);
		if (is_body)
			break;

		/* Makes no sense to look for related MIME parts if we
		   only want the plain text parts */
		if (want_html && g_str_has_prefix (content_type, "multipart/related")) {
			/* In an alternative the last part is supposed
			   to be the richest */
			if (related)
				g_object_unref (related);
			related = g_object_ref (part);
		}

		g_object_unref (part);
		part = NULL;

	}
	g_object_unref (iter);
	g_object_unref (parts);

	if (part == NULL) {
		if (related) {
			TnyMimePart *retval;
			if (first_part)
				g_object_unref (first_part);
			retval = modest_tny_msg_find_body_part_from_mime_part (related, want_html);
			g_object_unref (related);
			return retval;
		} else {
			return first_part;
		}
	} else {
		if (first_part)
			g_object_unref (first_part);
		if (related)
			g_object_unref (related);
		return part;
	}
}

static TnyMimePart*
modest_tny_msg_find_body_part_from_mime_part (TnyMimePart *msg, gboolean want_html)
{
	TnyMimePart *part = NULL;
	TnyList *parts = NULL;
	TnyIterator *iter = NULL;
	gchar *header_content_type;
	gchar *header_content_type_lower = NULL;
	gboolean is_related = FALSE;

	if (!msg)
		return NULL;

	/* If it's an application multipart, then we don't get into as we don't
	 * support them (for example application/sml or wap messages */
	header_content_type = modest_tny_mime_part_get_header_value (msg, "Content-Type");
	if (header_content_type) {
		header_content_type = g_strstrip (header_content_type);
		header_content_type_lower = g_ascii_strdown (header_content_type, -1);
	}
	if (header_content_type_lower &&
	    g_str_has_prefix (header_content_type_lower, "multipart/") &&
	    !g_str_has_prefix (header_content_type_lower, "multipart/signed") &&
	    strstr (header_content_type_lower, "application/")) {
		g_free (header_content_type_lower);
		g_free (header_content_type);
		return NULL;
	}
	if (header_content_type_lower && 
	    g_str_has_prefix (header_content_type_lower, "multipart/alternative")) {
		g_free (header_content_type_lower);
		g_free (header_content_type);
		return modest_tny_msg_find_body_part_in_alternative (msg, want_html);
	}

	if (header_content_type_lower &&
	    g_str_has_prefix (header_content_type_lower, "multipart/related"))
		is_related = TRUE;

	g_free (header_content_type_lower);
	g_free (header_content_type);

	parts = TNY_LIST (tny_simple_list_new());
	tny_mime_part_get_parts (TNY_MIME_PART (msg), parts);

	/* no parts? assume it's single-part message */
	iter  = tny_list_create_iterator (parts);
	if (tny_iterator_is_done(iter)) {
		gchar *content_type;
		gboolean is_text_part;

		content_type = modest_tny_mime_part_get_content_type (msg);
		if (content_type == NULL)
			goto frees;
		is_text_part = g_str_has_prefix (content_type, "text/");
		g_free (content_type);

		/* if this part cannot be a supported body return NULL */
		if (is_text_part)
			part = TNY_MIME_PART (g_object_ref(G_OBJECT(msg)));
	} else {
		TnyMimePart *fallback = NULL;
		do {
			gchar *tmp, *content_type = NULL;
			gboolean has_content_disp_name = FALSE;

			part = TNY_MIME_PART(tny_iterator_get_current (iter));

			if (!part) {
				g_warning ("%s: not a valid mime part", __FUNCTION__);
				tny_iterator_next (iter);
				continue;
			}

			/* it's a message --> ignore */
			if (part && TNY_IS_MSG (part)) {
				g_object_unref (part);
				part = NULL;
				tny_iterator_next (iter);
				continue;
			}			

			/* we need to strdown the content type, because
			 * tny_mime_part_has_content_type does not do it...
			 */
			content_type = g_ascii_strdown (tny_mime_part_get_content_type (part), -1);

			/* mime-parts with a content-disposition header (either 'inline' or 'attachment')
			 * and a 'name=' thingy cannot be body parts
                         */

			tmp = modest_tny_mime_part_get_header_value (part, "Content-Disposition");
			if (tmp) {
				gchar *content_disp = g_ascii_strdown(tmp, -1);
				g_free (tmp);
				has_content_disp_name = g_strstr_len (content_disp, strlen(content_disp), "name=") != NULL;
				g_free (content_disp);
			}

			if (g_str_has_prefix (content_type, "text/") &&
			    !has_content_disp_name &&
			    !modest_tny_mime_part_is_attachment_for_modest (part)) {
				/* We found that some multipart/related emails include
				   empty text/plain parts at the end that could confuse the body
				   detection algorithm */
				if (is_related && g_str_has_prefix (content_type, "text/plain")) {
					fallback = g_object_ref (part);
				} else {
					/* we found the body. Doesn't have to be the desired mime part, first
					   text/ part in a multipart/mixed is the body */
					g_free (content_type);
					break;
				}
			} else if (g_str_has_prefix(content_type, "multipart/alternative")) {

				/* multipart? recurse! */
				g_object_unref (part);
				g_free (content_type);
				part = modest_tny_msg_find_body_part_in_alternative (part, want_html);
				if (part)
					break;

			} else 	if (g_str_has_prefix(content_type, "multipart")) {

				/* multipart? recurse! */
				g_object_unref (part);
				g_free (content_type);
				part = modest_tny_msg_find_body_part_from_mime_part (part, want_html);
				if (part)
					break;
			} else {
				g_free (content_type);
			}

			if (part) {
				g_object_unref (G_OBJECT(part));
				part = NULL;
			}
			tny_iterator_next (iter);

		} while (!tny_iterator_is_done(iter));

		if (!part && fallback)
			part = g_object_ref (fallback);
		if (fallback)
			g_object_unref (fallback);
	}

 frees:
	g_object_unref (G_OBJECT(iter));
	g_object_unref (G_OBJECT(parts));

	return part;
}

static TnyMimePart*
modest_tny_msg_find_calendar_from_mime_part (TnyMimePart *msg)
{
	TnyMimePart *part = NULL;
	TnyList *parts = NULL;
	TnyIterator *iter = NULL;
	gchar *header_content_type;
	gchar *header_content_type_lower = NULL;
	
	if (!msg)
		return NULL;

	/* If it's an application multipart, then we don't get into as we don't
	 * support them (for example application/sml or wap messages */
	header_content_type = modest_tny_mime_part_get_header_value (msg, "Content-Type");
	if (header_content_type) {
		header_content_type = g_strstrip (header_content_type);
		header_content_type_lower = g_ascii_strdown (header_content_type, -1);
	}
	if (header_content_type_lower && 
	    g_str_has_prefix (header_content_type_lower, "multipart/") &&
	    !g_str_has_prefix (header_content_type_lower, "multipart/signed") &&
	    strstr (header_content_type_lower, "application/")) {
		g_free (header_content_type_lower);
		g_free (header_content_type);
		return NULL;
	}	
	g_free (header_content_type_lower);
	g_free (header_content_type);

	parts = TNY_LIST (tny_simple_list_new());
	tny_mime_part_get_parts (TNY_MIME_PART (msg), parts);

	iter  = tny_list_create_iterator(parts);

	/* no parts? assume it's single-part message */
	if (tny_iterator_is_done(iter)) {
		gchar *content_type;
		gboolean is_calendar_part;
		g_object_unref (G_OBJECT(iter));
		content_type = modest_tny_mime_part_get_content_type (msg);
		if (content_type == NULL)
			return NULL;
		is_calendar_part = 
			g_str_has_prefix (content_type, "text/calendar");
		g_free (content_type);
		/* if this part cannot be a supported body return NULL */
		if (!is_calendar_part) {
			return NULL;
		} else {
			return TNY_MIME_PART (g_object_ref(G_OBJECT(msg)));
		}
	} else {
		do {
			gchar *tmp, *content_type = NULL;
			gboolean has_content_disp_name = FALSE;

			part = TNY_MIME_PART(tny_iterator_get_current (iter));

			if (!part) {
				g_warning ("%s: not a valid mime part", __FUNCTION__);
				tny_iterator_next (iter);
				continue;
			}

			/* it's a message --> ignore */
			if (part && TNY_IS_MSG (part)) {
				g_object_unref (part);
				part = NULL;
				tny_iterator_next (iter);
				continue;
			}			

			/* we need to strdown the content type, because
			 * tny_mime_part_has_content_type does not do it...
			 */
			content_type = g_ascii_strdown (tny_mime_part_get_content_type (part), -1);
			
			/* mime-parts with a content-disposition header (either 'inline' or 'attachment')
			 * and a 'name=' thingy cannot be body parts
                         */
				
			tmp = modest_tny_mime_part_get_header_value (part, "Content-Disposition");
			if (tmp) {
				gchar *content_disp = g_ascii_strdown(tmp, -1);
				g_free (tmp);
				has_content_disp_name = g_strstr_len (content_disp, strlen(content_disp), "name=") != NULL;
				g_free (content_disp);
			}
			
			if (g_str_has_prefix (content_type, "text/calendar") && 
			    !has_content_disp_name &&
			    !modest_tny_mime_part_is_attachment_for_modest (part)) {
				/* we found the body. Doesn't have to be the desired mime part, first
				   text/ part in a mixed is the body */
				g_free (content_type);
				break;

			} else 	if (g_str_has_prefix(content_type, "multipart")) {

				/* multipart? recurse! */
				g_object_unref (part);
				g_free (content_type);
				part = modest_tny_msg_find_calendar_from_mime_part (part);
				if (part)
					break;
			} else
				g_free (content_type);
			
			if (part) {
				g_object_unref (G_OBJECT(part));
				part = NULL;
			}
			
			tny_iterator_next (iter);
			
		} while (!tny_iterator_is_done(iter));
	}
	
	g_object_unref (G_OBJECT(iter));
	g_object_unref (G_OBJECT(parts));

	return part; /* this maybe NULL, this is not an error; some message just don't have a body
		      * part */
}


TnyMimePart*
modest_tny_msg_find_body_part (TnyMsg *msg, gboolean want_html)
{
	g_return_val_if_fail (msg && TNY_IS_MSG(msg), NULL);
	
	return modest_tny_msg_find_body_part_from_mime_part (TNY_MIME_PART(msg),
							     want_html);
}

TnyMimePart*
modest_tny_msg_find_calendar (TnyMsg *msg)
{
	g_return_val_if_fail (msg && TNY_IS_MSG(msg), NULL);
	
	return modest_tny_msg_find_calendar_from_mime_part (TNY_MIME_PART(msg));
}


#define MODEST_TNY_MSG_PARENT_UID "parent-uid"

static TnyMsg *
create_reply_forward_mail (TnyMsg *msg, TnyHeader *header, const gchar *from,
			   const gchar *signature, gboolean is_reply,
			   guint type /*ignored*/, GList *attachments)
{
	TnyMsg *new_msg;
	TnyHeader *new_header;
	gchar *old_subject;
	gchar *new_subject;
	TnyMimePart *body = NULL;
	TnyMimePart *html_body = NULL;
	ModestFormatter *formatter;
	gboolean no_text_part;
	gchar *parent_uid;
	gboolean forward_as_attach = FALSE;

	if (header)
		g_object_ref (header);
	else
		header = tny_msg_get_header (msg);

	/* Get body from original msg. Always look for the text/plain
	   part of the message to create the reply/forwarded mail */
	if (msg != NULL) {
		body   = modest_tny_msg_find_body_part (msg, FALSE);
		html_body = modest_tny_msg_find_body_part (msg, TRUE);
	}

	if (modest_conf_get_bool (modest_runtime_get_conf (), MODEST_CONF_PREFER_FORMATTED_TEXT,
				  NULL))
		formatter = modest_formatter_new ("text/html", signature);
	else
		formatter = modest_formatter_new ("text/plain", signature);


	/* if we don't have a text-part */
	no_text_part = (!body) || (strcmp (tny_mime_part_get_content_type (body), "text/html")==0);

	/* when we're reply, include the text part if we have it, or nothing otherwise. */
	if (is_reply)
		new_msg = modest_formatter_quote  (formatter, body, header,
						    attachments);
	else {
		if (no_text_part || (html_body && (strcmp (tny_mime_part_get_content_type (html_body), "text/html")==0))) {
			forward_as_attach = TRUE;
			new_msg = modest_formatter_attach (formatter, msg, header);
		} else {
			forward_as_attach = FALSE;
			new_msg = modest_formatter_inline  (formatter, body, header,
							    attachments);
		}
	}

	g_object_unref (G_OBJECT(formatter));
	if (body)
		g_object_unref (G_OBJECT(body));
	if (html_body)
		g_object_unref (G_OBJECT(html_body));

	/* Fill the header */
	new_header = tny_msg_get_header (new_msg);
	tny_header_set_from (new_header, from);
	tny_header_set_replyto (new_header, from);

	/* Change the subject */
	old_subject = tny_header_dup_subject (header);
	new_subject =
		(gchar *) modest_text_utils_derived_subject (old_subject, is_reply);
	g_free (old_subject);
	tny_header_set_subject (new_header, (const gchar *) new_subject);
	g_free (new_subject);

	/* get the parent uid, and set it as a gobject property on the new msg */
	parent_uid = modest_tny_folder_get_header_unique_id (header);
	g_object_set_data_full (G_OBJECT(new_msg), MODEST_TNY_MSG_PARENT_UID,
				parent_uid, g_free);

	/* set modest as the X-Mailer
	 * we could this in the platform factory, but then the header
	 * would show up before all the others.
	 */
	tny_mime_part_set_header_pair (TNY_MIME_PART (msg), "X-Mailer", "Modest "
				       VERSION);

	/* Clean */
	g_object_unref (G_OBJECT (new_header));
	g_object_unref (G_OBJECT (header));
	/* ugly to unref it here instead of in the calling func */

	if (!is_reply & !forward_as_attach) {
		add_attachments (TNY_MIME_PART (new_msg), attachments, FALSE, NULL);
	}

	return new_msg;
}

const gchar*
modest_tny_msg_get_parent_uid (TnyMsg *msg)
{
	g_return_val_if_fail (msg && TNY_IS_MSG(msg), NULL);
	
	return g_object_get_data (G_OBJECT(msg), MODEST_TNY_MSG_PARENT_UID);
}

static gchar *get_signed_protocol (TnyMimePart *part)
{
	TnyList *header_pairs;
	TnyIterator *iterator;
	gchar *result = NULL;

	header_pairs = TNY_LIST (tny_simple_list_new ());
	tny_mime_part_get_header_pairs (part, header_pairs);
	iterator = tny_list_create_iterator (header_pairs);

	while (!result && !tny_iterator_is_done (iterator)) {
		TnyPair *pair;
		const gchar *name;

		pair = TNY_PAIR (tny_iterator_get_current (iterator));
		name = tny_pair_get_name (pair);
		if (name && !g_ascii_strcasecmp (name, "Content-Type")) {
			const gchar *s;
			s = tny_pair_get_value (pair);
			if (s) {
				s = strstr (s, "protocol=");
				if (s) {
					const gchar *t;
					s += 9;
					if (*s == '\"') {
						s++;
						t = strstr (s, "\"");
					} else {
						t = strstr (s, ";");
					}
					result = g_strndup (s, t - s);
				}
			}
		}

		g_object_unref (pair);
		tny_iterator_next (iterator);
	}

	g_object_unref (iterator);
	g_object_unref (header_pairs);

	return result;
}

TnyMimePart *
modest_tny_msg_get_attachments_parent (TnyMsg *msg)
{
	TnyMimePart *result;
	const gchar *content_type;

	result = NULL;

	content_type = tny_mime_part_get_content_type (TNY_MIME_PART (msg));
	if (content_type && !strcmp (content_type, "multipart/signed")) {
		TnyList *msg_children;
		TnyIterator *iterator;
		gchar *signed_protocol;

		msg_children = TNY_LIST (tny_simple_list_new ());
		tny_mime_part_get_parts (TNY_MIME_PART (msg), msg_children);

		iterator = tny_list_create_iterator (msg_children);
		signed_protocol = get_signed_protocol (TNY_MIME_PART (msg));
			
		while (!result && !tny_iterator_is_done (iterator)) {
			TnyMimePart *part;

			part = TNY_MIME_PART (tny_iterator_get_current (iterator));
			if (signed_protocol) {
				const gchar *part_content_type;

				part_content_type = tny_mime_part_get_content_type (part);
				if (part_content_type && g_ascii_strcasecmp (part_content_type, signed_protocol)) {
					result = g_object_ref (part);
				}
			} else {
				result = g_object_ref (part);
			}

			g_object_unref (part);
			tny_iterator_next (iterator);
		}

		g_object_unref (iterator);
		g_free (signed_protocol);
		g_object_unref (msg_children);
	}
	if (result == NULL) {
		result = g_object_ref (msg);
	}

	return result;
}



static void
add_if_attachment (gpointer data, gpointer user_data)
{
	TnyMimePart *part;
	GList **attachments_list;

	part = TNY_MIME_PART (data);
	attachments_list = ((GList **) user_data);

	if (!tny_mime_part_is_purged (part) && ((tny_mime_part_is_attachment (part))||(TNY_IS_MSG (part)))) {
		*attachments_list = g_list_prepend (*attachments_list, part);
		g_object_ref (part);
	}
}

TnyMsg* 
modest_tny_msg_create_forward_msg (TnyMsg *msg, 
				   const gchar *from,
				   const gchar *signature,
				   ModestTnyMsgForwardType forward_type)
{
	TnyMsg *new_msg;
	TnyList *parts = NULL;
	GList *attachments_list = NULL;
	TnyMimePart *part_to_check = NULL;

	g_return_val_if_fail (msg && TNY_IS_MSG(msg), NULL);

	part_to_check = modest_tny_msg_get_attachments_parent (TNY_MSG (msg));
	
	/* Add attachments */
	parts = TNY_LIST (tny_simple_list_new());
	tny_mime_part_get_parts (TNY_MIME_PART (part_to_check), parts);
	tny_list_foreach (parts, add_if_attachment, &attachments_list);

	new_msg = create_reply_forward_mail (msg, NULL, from, signature, FALSE, forward_type,
					     attachments_list);

	/* Clean */
	if (attachments_list) {
		g_list_foreach (attachments_list, (GFunc) g_object_unref, NULL);
		g_list_free (attachments_list);
	}
	g_object_unref (G_OBJECT (parts));
	g_object_unref (part_to_check);

	return new_msg;
}



static gint
count_addresses (const gchar* addresses)
{
	gint count = 1;

	if (!addresses)
		return 0;
	
	while (*addresses) {
		if (*addresses == ',' || *addresses == ';')
			++count;
		++addresses;
	}
	
	return count;
}

static void
remove_undisclosed_recipients (gchar **recipients)
{
	GSList *addresses, *node;
	gboolean is_first;
	GString *result;

	g_return_if_fail (recipients);
	addresses = modest_text_utils_split_addresses_list (*recipients);

	is_first = TRUE;
	result = g_string_new ("");
	for (node = addresses; node != NULL; node = g_slist_next (node)) {
		const gchar *address = (const gchar *) node->data;

		if (address && strstr (address, "undisclosed-recipients"))
			continue;

		if (is_first)
			is_first = FALSE;
		else
			result = g_string_append (result, ", ");

		result = g_string_append (result, address);
	}
	g_slist_foreach (addresses, (GFunc)g_free, NULL);
	g_slist_free (addresses);

	g_free (*recipients);
	*recipients = g_string_free (result, FALSE);
}


/* get the new To:, based on the old header,
 * result is newly allocated or NULL in case of error
 * */
static gchar*
get_new_to (TnyMsg *msg, TnyHeader *header, const gchar* from,
	    ModestTnyMsgReplyMode reply_mode)
{
	const gchar *reply_header = "Reply-To:";
	const gchar *from_header = "From:";
	gchar* old_reply_to;
	gchar* old_from;
	gchar* new_to;
	gchar* tmp;
	
	/* according to RFC2369 (http://www.faqs.org/rfcs/rfc2369.html), we
	 * can identify Mailing-List posts by the List-Help header.
	 * for mailing lists, both the Reply-To: and From: should be included
	 * in the new To:; for now, we're ignoring List-Post
	 */
	gchar* list_help = modest_tny_mime_part_get_header_value (TNY_MIME_PART(msg), 
								  "List-Help");
	gboolean is_mailing_list = (list_help != NULL);
	g_free (list_help);


	/* reply to sender, use ReplyTo or From */
	old_reply_to = modest_tny_mime_part_get_header_value (TNY_MIME_PART(msg), 
							      "Reply-To"); 
	old_from     = tny_header_dup_from (header);

	if (!old_from && !old_reply_to) {
		g_debug ("%s: failed to get either Reply-To: or From: from header",
			   __FUNCTION__);
		return NULL;
	}

	/* Prevent DoS attacks caused by malformed emails */
	if (old_from) {
		gchar *tmp = old_from;
		old_from = modest_text_utils_get_secure_header ((const gchar *) tmp, from_header);
		g_free (tmp);
	}
	if (old_reply_to) {
		gchar *tmp = old_reply_to;
		old_reply_to = modest_text_utils_get_secure_header ((const gchar *) tmp, reply_header);
		g_free (tmp);
	}

	/* for mailing lists, use both Reply-To and From if we did a
	 * 'Reply All:'
	 * */
	if (is_mailing_list && reply_mode == MODEST_TNY_MSG_REPLY_MODE_ALL &&
	    old_reply_to && old_from && strcmp (old_from, old_reply_to) != 0)
		new_to = g_strjoin (",", old_reply_to, old_from, NULL);
	else
		/* otherwise use either Reply-To: (preferred) or From: */
		new_to = g_strdup (old_reply_to ? old_reply_to : old_from);
	g_free (old_from);
	g_free (old_reply_to);

	/* in case of ReplyAll, we need to add the Recipients in the old To: */
	if (reply_mode == MODEST_TNY_MSG_REPLY_MODE_ALL) {
		gchar *old_to = tny_header_dup_to (header);
		if (!old_to) 
			g_debug ("%s: no To: address found in source mail",
				   __FUNCTION__);
		else {
			/* append the old To: */
			gchar *tmp = g_strjoin (",", new_to, old_to, NULL);
			g_free (new_to);
			new_to = tmp;
			g_free (old_to);
		}

		/* remove duplicate entries */
		gchar *tmp = modest_text_utils_remove_duplicate_addresses (new_to);
		g_free (new_to);
		new_to = tmp;
		
		/* now, strip me (the new From:) from the new_to, but only if
		 * there are >1 addresses there */
		if (count_addresses (new_to) > 1) {
			gchar *tmp = modest_text_utils_remove_address (new_to, from);
			g_free (new_to);
			new_to = tmp;
		}
	}

	tmp = modest_text_utils_simplify_recipients (new_to);
	remove_undisclosed_recipients  (&tmp);
	g_free (new_to);
	new_to = tmp;

	return new_to;
}


/* get the new Cc:, based on the old header,
 * result is newly allocated or NULL in case of error */
static gchar*
get_new_cc (TnyHeader *header, const gchar* from, const gchar *new_to)
{
	gchar *old_cc, *result, *dup;

	old_cc = tny_header_dup_cc (header);
	if (!old_cc)
		return NULL;

	/* remove me (the new From:) from the Cc: list */
	dup =  modest_text_utils_remove_address (old_cc, from);

	if (new_to) {
		gchar **to_parts, **current;

		to_parts = g_strsplit (new_to, ",", 0);
		for (current = to_parts; current && *current != '\0'; current++) {
			gchar *dup2;

			dup2 = modest_text_utils_remove_address (dup, g_strstrip (*current));
			g_free (dup);
			dup = dup2;
		}
		g_strfreev (to_parts);
	}

	result = modest_text_utils_remove_duplicate_addresses (dup);
	g_free (dup);
	dup = result;
	result = modest_text_utils_simplify_recipients (dup);
	remove_undisclosed_recipients  (&result);
	g_free (dup);
	g_free (old_cc);
	return result;
}

void 
modest_tny_msg_get_references (TnyMsg *msg, gchar **message_id, gchar **references, gchar **in_reply_to)
{
	TnyList *headers;
	TnyIterator *iterator;
	gchar *l_message_id;
	gchar *l_references;
	gchar *l_in_reply_to;

	g_return_if_fail (TNY_IS_MSG (msg));

	l_message_id = NULL;
	l_references = NULL;
	l_in_reply_to = NULL;

	headers = TNY_LIST (tny_simple_list_new ());
	tny_mime_part_get_header_pairs (TNY_MIME_PART (msg), headers);

	iterator = tny_list_create_iterator (headers);
	while (!tny_iterator_is_done (iterator)) {
		TnyPair *pair;
		const gchar *name;

		pair = TNY_PAIR (tny_iterator_get_current (iterator));
		name = tny_pair_get_name (pair);
		if (!g_ascii_strcasecmp (name, "References")) {
			if (l_references) g_free (l_references);
			l_references = g_strdup (tny_pair_get_value (pair));
		} else if (!g_ascii_strcasecmp (name, "In-Reply-To")) {
			if (l_in_reply_to) g_free (l_in_reply_to);
			l_in_reply_to = g_strdup (tny_pair_get_value (pair));
		} else if (!g_ascii_strcasecmp (name, "Message-ID")) {
			if (l_message_id) g_free (l_message_id);
			l_message_id = g_strdup (tny_pair_get_value (pair));
		}

		g_object_unref (pair);
		tny_iterator_next (iterator);
	}

	g_object_unref (iterator);
	g_object_unref (headers);

	if (message_id) {
		*message_id = l_message_id;
	} else {
		g_free (l_message_id);
	}

	if (in_reply_to) {
		*in_reply_to = l_in_reply_to;
	} else {
		g_free (l_in_reply_to);
	}

	if (references) {
		*references = l_references;
	} else {
		g_free (l_references);
	}
}

static void
remove_line_breaks (gchar *str)
{
	gchar *needle = g_strrstr (str, "\r\n");
	if (needle)
		*needle = '\0';
}

static void 
set_references (TnyMsg *reply_msg, TnyMsg *original_msg)
{
	gchar *orig_references, *orig_in_reply_to, *orig_message_id;
	gchar *references, *in_reply_to;

	modest_tny_msg_get_references (original_msg, &orig_message_id, &orig_references, &orig_in_reply_to);

	references = NULL;
	in_reply_to = NULL;

	if (orig_message_id)
		in_reply_to = g_strdup (orig_message_id);

	if (orig_references) {
		if (orig_message_id)
			references = g_strconcat (orig_references, "\n        ", orig_message_id, NULL);
		else
			references = g_strdup (orig_references);

	} else if (orig_in_reply_to) {
		if (orig_message_id)
			references = g_strconcat (orig_in_reply_to, "\n        ", orig_message_id, NULL);
		else
			references = g_strdup (orig_in_reply_to);
	} else if (orig_message_id) {
		references = g_strdup (orig_message_id);
	}

	g_free (orig_references);
	g_free (orig_in_reply_to);
	g_free (orig_message_id);

	if (in_reply_to) {
		remove_line_breaks (in_reply_to);
		tny_mime_part_set_header_pair (TNY_MIME_PART (reply_msg), "In-Reply-To", in_reply_to);
		g_free (in_reply_to);
	}
	if (references) {
		remove_line_breaks (references);
		tny_mime_part_set_header_pair (TNY_MIME_PART (reply_msg), "References", references);
		g_free (references);
	}
}

TnyMsg*
modest_tny_msg_create_reply_msg (TnyMsg *msg,
				 TnyHeader *header,
				 const gchar *from,
				 const gchar *signature,
				 ModestTnyMsgReplyType reply_type,
				 ModestTnyMsgReplyMode reply_mode)
{
	TnyMsg *new_msg = NULL;
	TnyHeader *new_header;
	gchar *new_to = NULL;
	TnyList *parts = NULL;
	GList *attachments_list = NULL;
	TnyMimePart *part_to_check = NULL;

	g_return_val_if_fail (msg && TNY_IS_MSG(msg), NULL);

	part_to_check = modest_tny_msg_get_attachments_parent (TNY_MSG (msg));

	parts = TNY_LIST (tny_simple_list_new());
	tny_mime_part_get_parts (TNY_MIME_PART (part_to_check), parts);
	tny_list_foreach (parts, add_if_attachment, &attachments_list);

	new_msg = create_reply_forward_mail (msg, header, from, signature, TRUE, reply_type,
					     attachments_list);

	set_references (new_msg, msg);
	if (attachments_list != NULL) {
		g_list_foreach (attachments_list, (GFunc) g_object_unref, NULL);
		g_list_free (attachments_list);
	}
	g_object_unref (parts);

	/* Fill the header */
	if (header)
		g_object_ref (header);
	else
		header = tny_msg_get_header (msg);

	
	new_header = tny_msg_get_header(new_msg);
	new_to = get_new_to (msg, header, from, reply_mode);
	if (!new_to)
		g_debug ("%s: failed to get new To:", __FUNCTION__);
	else {
		tny_header_set_to (new_header, new_to);
	}

	if (reply_mode == MODEST_TNY_MSG_REPLY_MODE_ALL) {
		gchar *new_cc = get_new_cc (header, from, new_to);
		if (new_cc) { 
			tny_header_set_cc (new_header, new_cc);
			g_free (new_cc);
		}
	}

	if (new_to)
		g_free (new_to);

	/* Clean */
	g_object_unref (G_OBJECT (new_header));
	g_object_unref (G_OBJECT (header));
	g_object_unref (G_OBJECT (part_to_check));

	return new_msg;
}

TnyMsg*
modest_tny_msg_create_reply_calendar_msg (TnyMsg *msg,
					  TnyHeader *header,
					  const gchar *from,
					  const gchar *signature,
					  TnyList *headers)
{
	TnyMsg *new_msg = NULL;
	TnyIterator *iterator;

	g_return_val_if_fail (msg && TNY_IS_MSG(msg), NULL);

	new_msg = modest_tny_msg_create_reply_msg (msg, header, from, signature,  
						   MODEST_TNY_MSG_REPLY_TYPE_QUOTE, MODEST_TNY_MSG_REPLY_MODE_SENDER);

	iterator = tny_list_create_iterator (headers);
	while (!tny_iterator_is_done (iterator)) {
		TnyPair *pair = TNY_PAIR (tny_iterator_get_current (iterator));

		tny_mime_part_set_header_pair (TNY_MIME_PART (new_msg),
					       tny_pair_get_name (pair),
					       tny_pair_get_value (pair));
		g_object_unref (pair);
		tny_iterator_next (iterator);
	}
	g_object_unref (iterator);

	return new_msg;
}


static gboolean
is_ascii(const gchar *s)
{
	if (!s)
		return TRUE;
	while (s[0]) {
		if (s[0] & 128 || s[0] < 32)
			return FALSE;
		s++;
	}
	return TRUE;
}

static char *
get_content_type(const gchar *s)
{
	GString *type;
	
	type = g_string_new("text/plain");
	if (!is_ascii(s)) {
		if (g_utf8_validate(s, -1, NULL)) {
			g_string_append(type, "; charset=\"utf-8\"");
		} else {
			/* it should be impossible to reach this, but better safe than sorry */
			g_debug("invalid utf8 in message");
			g_string_append(type, "; charset=\"latin1\"");
		}
	}
	return g_string_free(type, FALSE);
}

guint64
modest_tny_msg_estimate_size (const gchar *plain_body, const gchar *html_body,
			      guint64 parts_count,
			      guint64 parts_size)
{
	guint64 result;

	/* estimation of headers size */
	result = 1024;

	/* We add a 20% of size due to the increase in 7bit encoding */
	if (plain_body) {
		result += strlen (plain_body) * 120 / 100;
	}
	if (html_body) {
		result += strlen (html_body) * 120 / 100;
	}

	/* 256 bytes per additional part because of their headers */
	result += parts_count * 256;

	/* 150% of increase per encoding */
	result += parts_size * 3 / 2;

	return result;
}

GSList *
modest_tny_msg_header_get_all_recipients_list (TnyHeader *header)
{
	GSList *recipients = NULL;
	gchar *from = NULL, *to = NULL, *cc = NULL, *bcc = NULL;
	gchar *after_remove, *joined;

	if (header == NULL)
		return NULL;

	from = tny_header_dup_from (header);
	to = tny_header_dup_to (header);
	cc = tny_header_dup_cc (header);
	bcc = tny_header_dup_bcc (header);

	joined = modest_text_utils_join_addresses (from, to, cc, bcc);
	after_remove = modest_text_utils_remove_duplicate_addresses (joined);
	g_free (joined);

	recipients = modest_text_utils_split_addresses_list (after_remove);
	g_free (after_remove);

	if (from)
		g_free (from);
	if (to)
		g_free (to);
	if (cc)
		g_free (cc);
	if (bcc)
		g_free (bcc);

	return recipients;
}

GSList *
modest_tny_msg_get_all_recipients_list (TnyMsg *msg)
{
	TnyHeader *header = NULL;
	GSList *recipients = NULL;

	if (msg == NULL)
		return NULL;

	header = tny_msg_get_header (msg);
	if (header == NULL)
		return NULL;

	recipients = modest_tny_msg_header_get_all_recipients_list (header);
	g_object_unref (header);

	return recipients;
}

