/*-------------------------------------------------------------------------
 *
 * xlogbackup.c
 *		Internal routines for base backups.
 *
 * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * IDENTIFICATION
 *      src/backend/access/transam/xlogbackup.c
 *-------------------------------------------------------------------------
 */

#include "postgres.h"

#include "access/xlog.h"
#include "access/xlog_internal.h"
#include "access/xlogbackup.h"

/*
 * Build contents for backup_label or backup history file.
 *
 * When ishistoryfile is true, it creates the contents for a backup history
 * file, otherwise it creates contents for a backup_label file.
 *
 * Returns the result generated as a palloc'd string.
 */
char *
build_backup_content(BackupState *state, bool ishistoryfile)
{
	char		startstrbuf[128];
	char		startxlogfile[MAXFNAMELEN]; /* backup start WAL file */
	XLogSegNo	startsegno;
	StringInfo	result = makeStringInfo();
	char	   *data;

	Assert(state != NULL);

	/* Use the log timezone here, not the session timezone */
	pg_strftime(startstrbuf, sizeof(startstrbuf), "%Y-%m-%d %H:%M:%S %Z",
				pg_localtime(&state->starttime, log_timezone));

	XLByteToSeg(state->startpoint, startsegno, wal_segment_size);
	XLogFileName(startxlogfile, state->starttli, startsegno, wal_segment_size);
	appendStringInfo(result, "START WAL LOCATION: %X/%08X (file %s)\n",
					 LSN_FORMAT_ARGS(state->startpoint), startxlogfile);

	if (ishistoryfile)
	{
		char		stopxlogfile[MAXFNAMELEN];	/* backup stop WAL file */
		XLogSegNo	stopsegno;

		XLByteToSeg(state->stoppoint, stopsegno, wal_segment_size);
		XLogFileName(stopxlogfile, state->stoptli, stopsegno, wal_segment_size);
		appendStringInfo(result, "STOP WAL LOCATION: %X/%08X (file %s)\n",
						 LSN_FORMAT_ARGS(state->stoppoint), stopxlogfile);
	}

	appendStringInfo(result, "CHECKPOINT LOCATION: %X/%08X\n",
					 LSN_FORMAT_ARGS(state->checkpointloc));
	appendStringInfoString(result, "BACKUP METHOD: streamed\n");
	appendStringInfo(result, "BACKUP FROM: %s\n",
					 state->started_in_recovery ? "standby" : "primary");
	appendStringInfo(result, "START TIME: %s\n", startstrbuf);
	appendStringInfo(result, "LABEL: %s\n", state->name);
	appendStringInfo(result, "START TIMELINE: %u\n", state->starttli);

	if (ishistoryfile)
	{
		char		stopstrfbuf[128];

		/* Use the log timezone here, not the session timezone */
		pg_strftime(stopstrfbuf, sizeof(stopstrfbuf), "%Y-%m-%d %H:%M:%S %Z",
					pg_localtime(&state->stoptime, log_timezone));

		appendStringInfo(result, "STOP TIME: %s\n", stopstrfbuf);
		appendStringInfo(result, "STOP TIMELINE: %u\n", state->stoptli);
	}

	/* either both istartpoint and istarttli should be set, or neither */
	Assert(XLogRecPtrIsInvalid(state->istartpoint) == (state->istarttli == 0));
	if (!XLogRecPtrIsInvalid(state->istartpoint))
	{
		appendStringInfo(result, "INCREMENTAL FROM LSN: %X/%08X\n",
						 LSN_FORMAT_ARGS(state->istartpoint));
		appendStringInfo(result, "INCREMENTAL FROM TLI: %u\n",
						 state->istarttli);
	}

	data = result->data;
	pfree(result);

	return data;
}
