/* Synchronet message base (SMB) high-level "add message" function */

/****************************************************************************
 * @format.tab-size 4		(Plain Text/Source Code File Header)			*
 * @format.use-tabs true	(see http://www.synchro.net/ptsc_hdr.html)		*
 *																			*
 * Copyright Rob Swindell - http://www.synchro.net/copyright.html			*
 *																			*
 * This library 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) any later version.					*
 * See the GNU Lesser General Public License for more details: lgpl.txt or	*
 * http://www.fsf.org/copyleft/lesser.html									*
 *																			*
 * For Synchronet coding style and modification guidelines, see				*
 * http://www.synchro.net/source.html										*
 *																			*
 * Note: If this box doesn't appear square, then you need to fix your tabs.	*
 ****************************************************************************/

#include <time.h>
#include <string.h> /* strlen(), memset() */
#include "smblib.h"
#include "genwrap.h"
#include "crc32.h"
#include "lzh.h"
#include "datewrap.h"
#include "xpdatetime.h"

/****************************************************************************/
/****************************************************************************/
int smb_addmsg(smb_t* smb, smbmsg_t* msg, int storage, int dupechk_hashes
               , uint16_t xlat, const uchar* body, const uchar* tail)
{
	uchar*   lzhbuf = NULL;
	uint32_t lzhlen;
	int      retval;
	size_t   n;
	off_t    l;
	off_t    length;
	size_t   taillen = 0;
	size_t   bodylen = 0;
	size_t   chklen = 0;
	off_t    offset;
	uint32_t crc = 0xffffffff;
	hash_t   found;
	hash_t** hashes = NULL;     /* This is a NULL-terminated list of hashes */
	smbmsg_t remsg;

	if (!SMB_IS_OPEN(smb)) {
		safe_snprintf(smb->last_error, sizeof(smb->last_error), "%s msgbase not open", __FUNCTION__);
		return SMB_ERR_NOT_OPEN;
	}

	if (filelength(fileno(smb->shd_fp)) < 1) {  /* Create it if it doesn't exist */
		/* smb->status.max_crcs, max_msgs, max_age, and attr should be pre-initialized */
		if ((retval = smb_create(smb)) != SMB_SUCCESS)
			return retval;
	}

	if (!smb->smbhdr_locked && smb_locksmbhdr(smb) != SMB_SUCCESS)
		return SMB_ERR_LOCK;

	msg->hdr.total_dfields = 0;

	/* try */
	do {

		if ((retval = smb_getstatus(smb)) != SMB_SUCCESS)
			break;

		msg->hdr.number = smb->status.last_msg + 1;
		if (!(smb->status.attr & (SMB_EMAIL | SMB_NOHASH | SMB_FILE_DIRECTORY))) {

			hashes = smb_msghashes(msg, body, SMB_HASH_SOURCE_DUPE);

			if (smb_findhash(smb, hashes, &found, dupechk_hashes, /* mark? */ false) == SMB_SUCCESS) {
				safe_snprintf(smb->last_error, sizeof(smb->last_error)
				              , "%s duplicate %s: %s found in message #%u"
				              , __FUNCTION__
				              , smb_hashsourcetype(found.source)
				              , smb_hashsource(msg, found.source)
				              , (uint)found.number);
				retval = SMB_DUPE_MSG;
				break;
			}
		}

		if (tail != NULL && (taillen = strlen((const char *)tail)) > 0)
			taillen += sizeof(xlat); /* xlat string terminator */

		if (body != NULL && (bodylen = strlen((const char *)body)) > 0) {

			/* Remove white-space from end of message text */
			chklen = bodylen;
			while (chklen && body[chklen - 1] <= ' ')
				chklen--;

			/* Calculate CRC-32 of message text (before encoding, if any) */
			if (smb->status.max_crcs && dupechk_hashes & (1 << SMB_HASH_SOURCE_BODY)) {
				for (l = 0; l < (off_t)chklen; l++)
					crc = ucrc32(body[l], crc);
				crc = ~crc;

				/* Add CRC to CRC history (and check for duplicates) */
				if ((retval = smb_addcrc(smb, crc)) != SMB_SUCCESS)
					break;
			}

			bodylen += sizeof(xlat);  /* xlat string terminator */

			/* LZH compress? */
			if (xlat == XLAT_LZH && bodylen + taillen >= SDT_BLOCK_LEN
			    && (lzhbuf = (uchar *)malloc(bodylen * 2)) != NULL) {
				lzhlen = lzh_encode((uchar*)body, bodylen - sizeof(xlat), lzhbuf, bodylen * 2);
				if (lzhlen > 1
				    && smb_datblocks(lzhlen + (sizeof(xlat) * 2) + taillen)
				    < smb_datblocks(bodylen + taillen)) {
					bodylen = lzhlen + (sizeof(xlat) * 2);    /* Compressible */
					body = lzhbuf;
				} else
					xlat = XLAT_NONE;
			} else
				xlat = XLAT_NONE;
		}

		length = bodylen + taillen;

		if (length) {

			if (length >= 0x80000000 || length < 0) {
				sprintf(smb->last_error, "%s message length: 0x%" PRIXMAX, __FUNCTION__, (intmax_t)length);
				retval = SMB_ERR_DAT_LEN;
				break;
			}

			/* Allocate Data Blocks */
			if (smb->status.attr & SMB_HYPERALLOC) {
				offset = smb_hallocdat(smb);
				storage = SMB_HYPERALLOC;
			} else {
				if ((retval = smb_open_da(smb)) != SMB_SUCCESS)
					break;
				if (storage == SMB_FASTALLOC)
					offset = smb_fallocdat(smb, length, 1);
				else { /* SMB_SELFPACK */
					offset = smb_allocdat(smb, length, 1);
					storage = SMB_SELFPACK;
				}
				smb_close_da(smb);
			}

			if (offset < 0) {
				retval = (int)offset;
				break;
			}
			msg->hdr.offset = (uint32_t)offset;

			if (smb_fseek(smb->sdt_fp, offset, SEEK_SET) != 0) {
				sprintf(smb->last_error, "%s seek error %d", __FUNCTION__, errno);
				retval = SMB_ERR_SEEK;
				break;
			}

			if (bodylen) {
				if ((retval = smb_dfield(msg, TEXT_BODY, bodylen)) != SMB_SUCCESS)
					break;

				if (xlat != XLAT_NONE) {   /* e.g. XLAT_LZH */
					if (smb_fwrite(smb, &xlat, sizeof(xlat), smb->sdt_fp) != sizeof(xlat)) {
						safe_snprintf(smb->last_error, sizeof(smb->last_error)
						              , "%s writing body xlat string"
						              , __FUNCTION__);
						retval = SMB_ERR_WRITE;
						break;
					}
					bodylen -= sizeof(xlat);
				}
				xlat = XLAT_NONE; /* xlat string terminator */
				if (smb_fwrite(smb, &xlat, sizeof(xlat), smb->sdt_fp) != sizeof(xlat)) {
					safe_snprintf(smb->last_error, sizeof(smb->last_error)
					              , "%s writing body xlat terminator"
					              , __FUNCTION__);
					retval = SMB_ERR_WRITE;
					break;
				}
				bodylen -= sizeof(xlat);

				if (smb_fwrite(smb, body, bodylen, smb->sdt_fp) != bodylen) {
					safe_snprintf(smb->last_error, sizeof(smb->last_error)
					              , "%s writing body (%d bytes)"
					              , __FUNCTION__
					              , (int)bodylen);
					retval = SMB_ERR_WRITE;
					break;
				}
			}

			if (taillen) {
				if ((retval = smb_dfield(msg, TEXT_TAIL, taillen)) != SMB_SUCCESS)
					break;

				xlat = XLAT_NONE; /* xlat string terminator */
				if (smb_fwrite(smb, &xlat, sizeof(xlat), smb->sdt_fp) != sizeof(xlat)) {
					safe_snprintf(smb->last_error, sizeof(smb->last_error)
					              , "%s writing tail xlat terminator"
					              , __FUNCTION__);
					retval = SMB_ERR_WRITE;
					break;
				}

				if (smb_fwrite(smb, tail, taillen - sizeof(xlat), smb->sdt_fp) != taillen - sizeof(xlat)) {
					safe_snprintf(smb->last_error, sizeof(smb->last_error)
					              , "%s writing tail (%d bytes)"
					              , __FUNCTION__
					              , (int)(taillen - sizeof(xlat)));
					retval = SMB_ERR_WRITE;
					break;
				}
			}

			for (l = length; l % SDT_BLOCK_LEN; l++) {
				if (smb_fputc(0, smb->sdt_fp) != 0)
					break;
			}
			if (l % SDT_BLOCK_LEN) {
				safe_snprintf(smb->last_error, sizeof(smb->last_error)
				              , "%s writing data padding"
				              , __FUNCTION__);
				retval = SMB_ERR_WRITE;
				break;
			}

			fflush(smb->sdt_fp);
		}

		if (msg->hdr.when_imported.time == 0) {
			msg->hdr.when_imported.time = (uint32_t)time(NULL);
			msg->hdr.when_imported.zone = xpTimeZone_local();
		}
		if (msg->hdr.when_written.time == 0)   /* Uninitialized */
			msg->hdr.when_written = smb_when(msg->hdr.when_imported.time, msg->hdr.when_imported.zone);

		/* Look-up thread_back if RFC822 Reply-ID was specified */
		if (msg->hdr.thread_back == 0 && msg->reply_id != NULL) {
			if (smb_getmsgidx_by_msgid(smb, &remsg, msg->reply_id) == SMB_SUCCESS)
				msg->hdr.thread_back = remsg.idx.number; /* needed for threading backward */
		}

		/* Look-up thread_back if FTN REPLY was specified */
		if (msg->hdr.thread_back == 0 && msg->ftn_reply != NULL) {
			if (smb_getmsgidx_by_ftnid(smb, &remsg, msg->ftn_reply) == SMB_SUCCESS)
				msg->hdr.thread_back = remsg.idx.number; /* needed for threading backward */
		}

		/* Auto-thread linkage */
		if (msg->hdr.thread_back) {
			memset(&remsg, 0, sizeof(remsg));
			remsg.hdr.number = msg->hdr.thread_back;
			if (smb_getmsgidx(smb, &remsg) == SMB_SUCCESS  /* valid thread back */
			    && smb_lockmsghdr(smb, &remsg) == SMB_SUCCESS) {

				do { /* try */

					if (smb_getmsghdr(smb, &remsg) != SMB_SUCCESS)
						break;

					if (msg->hdr.thread_id == 0) { /* no thread_id pre-specified */
						if ((msg->hdr.thread_id = remsg.hdr.thread_id) == 0)
							msg->hdr.thread_id = remsg.hdr.number;
					}

					/* Add RFC-822 Reply-ID if original message has RFC Message-ID */
					if (msg->reply_id == NULL && remsg.id != NULL
					    && smb_hfield_str(msg, RFC822REPLYID, remsg.id) != SMB_SUCCESS)
						break;

					/* Add FidoNet Reply if original message has FidoNet MSGID */
					if (msg->ftn_reply == NULL && remsg.ftn_msgid != NULL
					    && smb_hfield_str(msg, FIDOREPLYID, remsg.ftn_msgid) != SMB_SUCCESS)
						break;

					smb_updatethread(smb, &remsg, msg->hdr.number);

				} while (0); /* finally */

				smb_unlockmsghdr(smb, &remsg);
				smb_freemsgmem(&remsg);
			}
		}

		if (!(smb->status.attr & (SMB_EMAIL | SMB_NOHASH | SMB_FILE_DIRECTORY))
		    && smb_addhashes(smb, hashes, /* skip_marked? */ false) == SMB_SUCCESS)
			msg->flags |= MSG_FLAG_HASHED;
		if (msg->hdr.type == SMB_MSG_TYPE_NORMAL && msg->to == NULL) /* no recipient, don't add header (required for bulkmail) */
			break;

		retval = smb_addmsghdr(smb, msg, storage); /* calls smb_unlocksmbhdr() */

	} while (0);
	/* finally */

	if (retval != SMB_SUCCESS)
		smb_freemsg_dfields(smb, msg, 1);

	if (smb->smbhdr_locked)
		smb_unlocksmbhdr(smb);
	FREE_AND_NULL(lzhbuf);
	FREE_LIST(hashes, n);

	return retval;
}

int smb_addvote(smb_t* smb, smbmsg_t* msg, int storage)
{
	int retval;

	if (!SMB_IS_OPEN(smb)) {
		safe_snprintf(smb->last_error, sizeof(smb->last_error), "%s msgbase not open", __FUNCTION__);
		return SMB_ERR_NOT_OPEN;
	}

	if (filelength(fileno(smb->shd_fp)) < 1) {
		safe_snprintf(smb->last_error, sizeof(smb->last_error), "%s header file empty", __FUNCTION__);
		return SMB_ERR_NOT_FOUND;
	}

	if (!(msg->hdr.attr & MSG_VOTE) || msg->hdr.attr & MSG_POLL) {
		safe_snprintf(smb->last_error, sizeof(smb->last_error), "%s incorrect attr: %04hX", __FUNCTION__, msg->hdr.attr);
		return SMB_ERR_HDR_ATTR;
	}

	if (msg->hdr.thread_back == 0) {
		safe_snprintf(smb->last_error, sizeof(smb->last_error), "%s thread_back field missing", __FUNCTION__);
		return SMB_ERR_HDR_FIELD;
	}

	msg->hdr.type = SMB_MSG_TYPE_BALLOT;

	if (msg->hdr.when_imported.time == 0) {
		msg->hdr.when_imported.time = (uint32_t)time(NULL);
		msg->hdr.when_imported.zone = xpTimeZone_local();
	}
	if (msg->hdr.when_written.time == 0) /* Uninitialized */
		msg->hdr.when_written = smb_when(msg->hdr.when_imported.time, msg->hdr.when_imported.zone);

	retval = smb_addmsghdr(smb, msg, storage);

	return retval;
}

int smb_addpoll(smb_t* smb, smbmsg_t* msg, int storage)
{
	int retval;

	if (!SMB_IS_OPEN(smb)) {
		safe_snprintf(smb->last_error, sizeof(smb->last_error), "%s msgbase not open", __FUNCTION__);
		return SMB_ERR_NOT_OPEN;
	}

	if (msg->subj == NULL) {
		safe_snprintf(smb->last_error, sizeof(smb->last_error), "%s subject field missing", __FUNCTION__);
		return SMB_ERR_HDR_FIELD;
	}

	if (smb_get_hfield(msg, SMB_POLL_ANSWER, NULL) == NULL) {
		safe_snprintf(smb->last_error, sizeof(smb->last_error), "%s poll answers missing", __FUNCTION__);
		return SMB_ERR_HDR_FIELD;
	}

	if (filelength(fileno(smb->shd_fp)) < 1) {    /* Create it if it doesn't exist */
		/* smb->status.max_crcs, max_msgs, max_age, and attr should be pre-initialized */
		if ((retval = smb_create(smb)) != SMB_SUCCESS)
			return retval;
	}

	msg->hdr.attr |= MSG_POLL;
	msg->hdr.type = SMB_MSG_TYPE_POLL;

	if (msg->hdr.when_imported.time == 0) {
		msg->hdr.when_imported.time = (uint32_t)time(NULL);
		msg->hdr.when_imported.zone = xpTimeZone_local();
	}
	if (msg->hdr.when_written.time == 0) /* Uninitialized */
		msg->hdr.when_written = smb_when(msg->hdr.when_imported.time, msg->hdr.when_imported.zone);

	retval = smb_addmsghdr(smb, msg, storage);

	return retval;
}

int smb_addpollclosure(smb_t* smb, smbmsg_t* msg, int storage)
{
	smbmsg_t remsg;
	int      retval;

	if (!SMB_IS_OPEN(smb)) {
		safe_snprintf(smb->last_error, sizeof(smb->last_error), "%s msgbase not open", __FUNCTION__);
		return SMB_ERR_NOT_OPEN;
	}

	if (filelength(fileno(smb->shd_fp)) < 1) {
		safe_snprintf(smb->last_error, sizeof(smb->last_error), "%s header file empty", __FUNCTION__);
		return SMB_ERR_NOT_FOUND;
	}

	if (msg->hdr.thread_back == 0) {
		safe_snprintf(smb->last_error, sizeof(smb->last_error), "%s thread_back field missing", __FUNCTION__);
		return SMB_ERR_HDR_FIELD;
	}

	memset(&remsg, 0, sizeof(remsg));
	remsg.hdr.number = msg->hdr.thread_back;
	if ((retval = smb_getmsgidx(smb, &remsg)) != SMB_SUCCESS)
		return retval;
	if ((retval = smb_lockmsghdr(smb, &remsg)) != SMB_SUCCESS)
		return retval;
	if ((retval = smb_getmsghdr(smb, &remsg)) != SMB_SUCCESS) {
		smb_unlockmsghdr(smb, &remsg);
		return retval;
	}

	if (remsg.hdr.auxattr & POLL_CLOSED) {
		safe_snprintf(smb->last_error, sizeof(smb->last_error), "%s closed poll", __FUNCTION__);
		smb_freemsgmem(&remsg);
		smb_unlockmsghdr(smb, &remsg);
		return SMB_CLOSED;
	}

	if (!smb_msg_is_from(&remsg, msg->from, msg->from_net.type, msg->from_net.addr)) {
		safe_snprintf(smb->last_error, sizeof(smb->last_error), "%s wrong pollster", __FUNCTION__);
		smb_freemsgmem(&remsg);
		smb_unlockmsghdr(smb, &remsg);
		return SMB_UNAUTHORIZED;
	}

	remsg.hdr.auxattr |= POLL_CLOSED;
	retval = smb_putmsghdr(smb, &remsg);
	smb_freemsgmem(&remsg);
	smb_unlockmsghdr(smb, &remsg);
	if (retval != SMB_SUCCESS)
		return retval;

	msg->hdr.attr |= MSG_POLL_CLOSURE;
	msg->hdr.type = SMB_MSG_TYPE_POLL_CLOSURE;

	if (msg->hdr.when_imported.time == 0) {
		msg->hdr.when_imported.time = (uint32_t)time(NULL);
		msg->hdr.when_imported.zone = xpTimeZone_local();
	}
	if (msg->hdr.when_written.time == 0) /* Uninitialized */
		msg->hdr.when_written = smb_when(msg->hdr.when_imported.time, msg->hdr.when_imported.zone);

	retval = smb_addmsghdr(smb, msg, storage);

	return retval;
}
