/*
    Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"), to
deal in the Software without restriction, including without limitation the
rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
sell copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

   Original Idea Copyright (c) 2006,2007 HPC2N, Umeå University, Sweden
   Modifications Copyright (c) 2012-2013 by Deon George
*/

/* Enable Large File Support stuff */
#define _FILE_OFFSET_BITS 64
#define _LARGEFILE_SOURCE 1
#define _LARGE_FILES 1

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <signal.h>
#include <limits.h>

#include "dsmrc.h"
#include "dsmapitd.h"
#include "dsmapifp.h"
#include "tsmpipe.h"

int copy_env(const char *from, const char *to) {
	char *e;
	char n[PATH_MAX+1];

	e = getenv(from);
	if (!e) {
		fprintf(stderr,"tsmpipe: Environment variable %s not set\n",from);
		return 0;
	}

	n[PATH_MAX] = '\0';
	snprintf(n, PATH_MAX, "%s=%s", to, e);

	if (putenv(strdup(n))) {
		perror("tsmpipe: Setting up environment");
		return 0;
	}

	return 1;
}

void usage(void) {
	fprintf(stderr,
		"tsmpipe %s, usage:\n"
		"\n"
		"tsmpipe [-i] [-A|-B] [-c|-x|-d|-t] -s fsname -f filepath [-l len]\n"
		"   -i Show session information:\n"
		"   -A and -B are mutually exclusive:\n"
		"       -A  Use Archive objects\n"
		"       -B  Use Backup objects\n"
		"   -c, -x, -d and -t are mutually exclusive:\n"
		"       -c  Create:  Read from stdin and store in TSM\n"
		"       -x  eXtract: Recall from TSM and write to stdout\n"
		"       -d  Delete:  Delete object from TSM\n"
		"       -t  lisT:    Print filelist to stdout\n"
		"   -s and -f are required arguments for (-A/ -B operations):\n"
		"       -s fsname   Name of filesystem in TSM\n"
		"       -f filepath Path to file within filesystem in TSM\n"
		"   -l length   Length of object to store. If guesstimating too large\n"
		"               is better than too small\n"
		"   -D desc     Description of archive object\n"
		"   -P pitdate  PITDate (mmddYYYY) (BACKUP Objects)\n"
		"   -O options  Extra options to pass to dsmInitEx\n"
		"   -v          Verbose. More -v's gives more verbosity\n"
	,_TSMPIPE_VERSION);

	exit(1);
}

int main(int argc, char *argv[]) {
	int c;
	extern int optopt;
	extern char *optarg;
	char archive=0, backup=0, create=0, xtract=0, delete=0, info=0, list=0;
	int verbose=0;
	char *space=NULL, *filename=NULL, *lenstr=NULL, *desc=NULL, *pitdate=NULL, *options=NULL;
	off_t length;
	dsUint32_t dsmHandle;
	dsmQueryType qType;

	while ((c = getopt(argc, argv, "hiABcxdtvs:f:l:D:O:P:")) != -1) {
		switch(c) {
			case 'h': usage(); break;
			case 'i': info = 1; break;
			case 'A': archive = 1; break;
			case 'B': backup = 1; break;
			case 'c': create = 1; break;
			case 'x': xtract = 1; break;
			case 'd': delete = 1; break;
			case 't': list = 1; break;
			case 'v': verbose++; break;
			case 's': space = optarg; break;
			case 'f': filename = optarg; break;
			case 'l': lenstr = optarg; break;
			case 'D': desc = optarg; break;
			case 'O': options = optarg; break;
			case 'P': pitdate = optarg; break;

			case ':':
				fprintf(stderr, "tsmpipe: Option -%c requires an operand\n", optopt);
				exit(1);
			case '?':
				fprintf(stderr, "tsmpipe: Unrecognized option: -%c\n", optopt);
				exit(1);
		}
	}

	if (archive+backup+info != 1) {
		fprintf(stderr, "tsmpipe: ERROR: Must give one of -i, -A or -B\n");
		exit(1);
	}

	// @todo To change.
	if (pitdate && ! backup) {
		fprintf(stderr, "tsmpipe: ERROR: -P can only be used with -A\n");
		exit(1);
	}

	if (! info) {
		if (create+xtract+delete+list != 1) {
			fprintf(stderr, "tsmpipe: ERROR: Must give one of -c, -x, -d or -t\n");
			exit(1);
		}

		if (! space) {
			fprintf(stderr, "tsmpipe: ERROR: Must give -s filespacename\n");
			exit(1);
		}

		if (! filename) {
			fprintf(stderr, "tsmpipe: ERROR: Must give -f filename\n");
			exit(1);
		}

		if(create && ! lenstr) {
			fprintf(stderr, "tsmpipe: ERROR: Must give -l length with -c\n");
			exit(1);
		}

		if(! create && lenstr) {
			fprintf(stderr, "tsmpipe: ERROR: -l length useless without -c\n");
			exit(1);
		}

		if(! archive && desc) {
			fprintf(stderr, "tsmpipe: ERROR: -D desc useless without -A\n");
			exit(1);
		}
	}

	qType = backup ? qtBackup : qtArchive;

	/* Let the TSM api get the signals */
	signal(SIGPIPE, SIG_IGN);
	signal(SIGINT, SIG_IGN);
	signal(SIGUSR1, SIG_IGN);

	if (getenv("DSM_DIR") && ((! copy_env("DSM_DIR", "DSMI_DIR")) || (! copy_env("DSM_CONFIG", "DSMI_CONFIG")))) {
		exit(1);
	}

	// OK, we are ready to talk to TSM
	if (verbose > 0)
		fprintf(stderr,"tsmpipe: Create TSM session\n");
	dsmHandle = tsm_initsess(options);
	if (! dsmHandle) {
		fprintf(stderr,"tsmpipe: Unable to create TSM session?\n");

		exit(2);
	}

	if (verbose > 1)
		fprintf(stderr, "tsmpipe: Session initiated\n");

	// Show our session information
	if (info) {
		if (verbose > 0)
			fprintf(stderr,"tsmpipe: INFO operation\n");

		tsm_sessioninfo(dsmHandle);
	}

	// If we are backing up
	if (create) {
		if (verbose > 0)
			fprintf(stderr,"tsmpipe: BACKUP operation\n");

		length = atof(lenstr);
		if (length <= 0) {
			fprintf(stderr,"tsmpipe: ERROR: Provide positive length, overestimate if guessing\n");
			exit(1);
		}

		if (! tsm_sendfile(dsmHandle,space,filename,length,desc,(archive ? stArchiveMountWait : stBackupMountWait),verbose)){
			dsmTerminate(dsmHandle);
			exit(3);
		}
		exit(0);
	}

	if (! info && ! create) {
		qryArchiveData qaData;
		qryBackupData qbData;
		dsmObjName objName;
		memset(&qaData,0x00,sizeof(qryArchiveData));
		memset(&qbData,0x00,sizeof(qryBackupData));
		objName = dsmNameToObjname(space,filename,verbose);

		// Setup our Query Object
		if (backup) {
			qbData.stVersion = qryBackupDataVersion;
			qbData.objName = &objName;
			qbData.owner = "";
			qbData.objState = delete ? DSM_ACTIVE : DSM_ANY_MATCH;

			if (delete || ! pitdate) {
				qbData.pitDate.year = DATE_MINUS_INFINITE;
			} else {
				// @todo Need to include time
				qbData.pitDate = dsmStrToDate(pitdate,verbose);
			}

		// We must be archive then
		} else {
			if (archive) {
				qaData.stVersion = qryArchiveDataVersion;
				qaData.objName = &objName;
				qaData.owner = "";

				if (pitdate) {
					fprintf(stderr,"tsmpipe: Archive Date Range Query not yet setup\n");
					exit(1);

				} else {
					qaData.insDateLowerBound.year = DATE_MINUS_INFINITE;
					qaData.insDateUpperBound.year = DATE_PLUS_INFINITE;
					qaData.expDateLowerBound.year = DATE_MINUS_INFINITE;
					qaData.expDateUpperBound.year = DATE_PLUS_INFINITE;
				}

				qaData.descr = desc ? desc : "*";

			} else {
				fprintf(stderr,"tsmpipe: ERROR: How can we not be a backup or archive?\n");
				exit(1);
			}
		}

		// Delete an object from TSM
		if (delete) {
			if (verbose > 0)
				fprintf(stderr,"tsmpipe: DELETE operation\n");

			// @todo Delete Archives by date range.
			if (! tsm_deletefile(dsmHandle,qType,qaData,qbData,verbose)) {
				dsmTerminate(dsmHandle);
				exit(3);
			}
		}

		// Restore from TSM
		if(xtract) {
			if (verbose > 0)
				fprintf(stderr,"tsmpipe: RESTORE operation\n");

			// @todo Query Archives by date range.
			if (! tsm_restorefile(dsmHandle,qType,qaData,qbData,verbose)) {
				dsmTerminate(dsmHandle);
				exit(3);
			}
		}

		// List objects in TSM
		if (list) {
			if (verbose > 0)
				fprintf(stderr,"tsmpipe: LIST operation\n");

			// @todo Query Archives by date range.
			if (! tsm_listfile(dsmHandle,qType,qaData,qbData,verbose)) {
				dsmTerminate(dsmHandle);
				exit(3);
			}
		}
	}

	if (verbose > 0)
		fprintf(stderr,"tsmpipe: Terminate TSM session\n");
	dsmTerminate(dsmHandle);

	if (verbose > 0)
		fprintf(stderr, "tsmpipe: Success\n");

	return 0;
}