/*
Copyright (C) 2003-2004 Douglas Thain and the University of Wisconsin
Copyright (C) 2005- The University of Notre Dame
This software is distributed under the GNU General Public License.
See the file COPYING for details.
*/

#ifdef HAS_IRODS

extern "C" {
#include "irods_reli.h"
#include "debug.h"
}

#include "pfs_table.h"
#include "pfs_service.h"

#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <errno.h>
#include <utime.h>
#include <sys/statfs.h>

class pfs_file_irods : public pfs_file
{
private:
	struct irods_file *ifile;

public:
	pfs_file_irods( pfs_name *name, irods_file *i ) : pfs_file(name) {
		ifile = i;
	}

	virtual int close() {
		return irods_reli_close(ifile);
	}

	virtual pfs_ssize_t read( void *data, pfs_size_t length, pfs_off_t offset ) {
		return irods_reli_pread(ifile,(char*)data,length,offset);
	}

	virtual pfs_ssize_t write( const void *data, pfs_size_t length, pfs_off_t offset ) {
		return irods_reli_pwrite(ifile,(char*)data,length,offset);
	}

	virtual int fstat( struct pfs_stat *info ) {
		return name.service->stat(&name,info);
	}

	virtual int fstatfs( struct pfs_statfs *info ) {
		return name.service->statfs(&name,info);
	}

	virtual int ftruncate( pfs_size_t length ) {
		return name.service->truncate(&name,length);
	}

	virtual int fchmod( mode_t mode ) {
		return name.service->chmod(&name,mode);
	}

	virtual int fchown( uid_t uid, gid_t gid ) {
		return 0;
	}

	virtual int fsync() {
		return 0;
	}

	virtual pfs_ssize_t get_size() {
		struct pfs_stat info;
		if(this->fstat(&info)==0) {
			return info.st_size;
		} else {
			return -1;
		}
	}
};

static void add_one_dir( const char *path, void *arg )
{
	pfs_dir *dir = (pfs_dir*) arg;
	dir->append(path);
}

class pfs_service_irods : public pfs_service {
public:
	virtual pfs_file * open( pfs_name *name, int flags, mode_t mode ) {

		struct irods_file *ifile;

		ifile = irods_reli_open(name->hostport,name->rest,flags,mode);
		if(ifile) {
			return new pfs_file_irods(name,ifile);
		} else {
			return 0;
		}
	}

	virtual pfs_dir * getdir( pfs_name *name ) {

		pfs_dir *dir = new pfs_dir(name);
		int result;

		result = irods_reli_getdir(name->hostport,name->rest,add_one_dir,dir);

		if(result<0) {
			delete dir;
			return 0;
		} else {
			return dir;
		}
		
	}

	virtual int statfs( pfs_name *name, struct pfs_statfs *info ) {
		return irods_reli_statfs(name->hostport,name->rest,info);
	}

	virtual int stat( pfs_name *name, struct pfs_stat *info ) {
		return irods_reli_stat(name->hostport,name->rest,info);
	}

	virtual int lstat( pfs_name *name, struct pfs_stat *info ) {
		return this->stat(name,info);
	}

	virtual int unlink( pfs_name *name ) {
		return irods_reli_unlink(name->hostport,name->rest);
	}

	virtual int access( pfs_name *name, mode_t mode ) {
		struct pfs_stat info;
		return this->stat(name,&info);
	}

	virtual int chmod( pfs_name *name, mode_t mode ) {
		return 0;
	}

	virtual int chown( pfs_name *name, uid_t uid, gid_t gid ) {
		return 0;
	}

	virtual int lchown( pfs_name *name, uid_t uid, gid_t gid ) {
		return 0;
	}

	virtual int truncate( pfs_name *name, pfs_off_t length ) {
		return irods_reli_truncate(name->hostport,name->rest,length);
	}

	virtual int utime( pfs_name *name, struct utiminfo *t ) {
		return 0;
	}

	virtual int rename( pfs_name *name, pfs_name *newname ) {
		if(strcmp(name->hostport,name->hostport)) {
			errno = EXDEV;
			return -1;
		}
		return irods_reli_rename(name->hostport,name->rest,newname->rest);
	}

	virtual int chdir( pfs_name *name, char *newname ) {
		int result=-1;
		struct pfs_stat info;
		if(this->stat(name,&info)>=0) {
			if(S_ISDIR(info.st_mode)) {
				sprintf(newname,"/%s/%s:%d%s",name->service_name,name->host,name->port,name->rest);
				result = 0;
			} else {
				errno = ENOTDIR;
				result = -1;
			}
		}	
		return result;
	}

	virtual int link( pfs_name *name, pfs_name *newname ) {
		errno = ENOSYS;
		return -1;
	}

	virtual int symlink( const char *linkname, pfs_name *newname ) {
		errno = ENOSYS;
		return -1;
	}

	virtual int readlink( pfs_name *name, char *info, pfs_size_t length ) {
		errno = EINVAL;
		return -1;
	}

	virtual int mkdir( pfs_name *name, mode_t mode ) {
		return irods_reli_mkdir(name->hostport,name->rest);
	}

	virtual int rmdir( pfs_name *name ) {
		return irods_reli_rmdir(name->hostport,name->rest);
	}

	virtual int md5( pfs_name *name, char *digest) {
		return irods_reli_md5(name->hostport,name->rest,digest);
	}

	virtual int get_default_port() {
		return 1247;
	}

	virtual int is_seekable() {
		return 1;
	}

};

static pfs_service_irods pfs_service_irods_instance;
pfs_service *pfs_service_irods = &pfs_service_irods_instance;

#endif


