/* Copyright (C) 2002 Timo Sirainen */

#include "lib.h"
#include "iobuffer.h"
#include "hostpid.h"
#include "message-size.h"
#include "message-part-serialize.h"
#include "mail-index.h"
#include "mail-index-util.h"

#include <unistd.h>
#include <fcntl.h>

void index_set_error(MailIndex *index, const char *fmt, ...)
{
	va_list va;

	i_free(index->error);

	if (fmt == NULL)
		index->error = NULL;
	else {
		va_start(va, fmt);
		index->error = i_strdup_vprintf(fmt, va);
		va_end(va);

		i_error("%s", index->error);
	}
}

void index_reset_error(MailIndex *index)
{
	if (index->error != NULL) {
		i_free(index->error);
		index->error = NULL;
	}
}

int mail_index_create_temp_file(MailIndex *index, const char **path)
{
	int fd;

	hostpid_init();

	/* use ".temp.host.pid" as temporary file name. unlink() it first,
	   just to be sure it's not symlinked somewhere for some reason.. */
	*path = t_strconcat(index->dir, "/.temp.",
			    my_hostname, ".", my_pid, NULL);
	(void)unlink(*path);

	/* usage of O_EXCL isn't exactly needed since the path should be
	   trusted, but it shouldn't hurt either - if creating file fails
	   because of it, it's because something must be wrong (race
	   condition). also, might not won't work through NFS but that
	   can't be helped. */
	fd = open(*path, O_RDWR | O_CREAT | O_EXCL, 0660);
	if (fd == -1)
		index_set_error(index, "Can't create temp index %s: %m", *path);

	return fd;
}


int mail_index_get_virtual_size(MailIndex *index, MailIndexRecord *rec,
				int fastscan, uoff_t *virtual_size)
{
	MessageSize hdr_size, body_size;
	IOBuffer *inbuf;
	const void *part_data;
	size_t size;

	if ((rec->index_flags & INDEX_MAIL_FLAG_BINARY_HEADER) &&
	    (rec->index_flags & INDEX_MAIL_FLAG_BINARY_BODY)) {
		/* virtual size == physical size */
		*virtual_size += rec->header_size + rec->body_size;
		return TRUE;
	}

	part_data = index->lookup_field_raw(index, rec,
					    FIELD_TYPE_MESSAGEPART, &size);
	if (part_data != NULL) {
		/* get sizes from preparsed message structure */
		if (!message_part_deserialize_size(part_data, size,
						   &hdr_size, &body_size)) {
			/* corrupted, ignore */
			index_set_error(index, "Error in index file %s: "
					"Corrupted cached MessagePart data",
					index->filepath);
		} else {
			*virtual_size = hdr_size.virtual_size +
				body_size.virtual_size;
			return TRUE;
		}
	}

	/* only way left is to actually parse the message */
	*virtual_size = 0;

	if (fastscan) {
		/* and we don't want that */
		return FALSE;
	}

	inbuf = index->open_mail(index, rec);
	if (inbuf == NULL)
		return FALSE;

	/* we don't care about the difference in header/body,
	   so parse the whole message as a "body" */
	message_get_body_size(inbuf, &body_size, (uoff_t)-1);
	*virtual_size = body_size.virtual_size;

	(void)close(inbuf->fd);
	io_buffer_destroy(inbuf);
	return TRUE;
}