#! /usr/bin/env python

##@namespace ush.hwrf_datastore
# A utility script for dumping or modifying the contents of an HWRF
# sqlite3 database file.
#
# This script can perform one of several operations on an sqlite3 file
# generated by the HWRF system.  It is called as follows:
# @code{.sh}
#  hwrf_datastore.py OP [ARG] file1.sqlite3 [file2.sqlite3 [...]]
# @endcode
#
# Valid operations (OP) are:
# * DUMP   --- dump entire database to stdout
# * UNFAIL --- mark all failed or running tasks as unstarted
# * UNRUN  --- mark all tasks as unstarted
# * UNRUN_ONE taskname --- unrun the specified task.
#Only UNRUN_ONE takes an argument, and that argument is mandatory: the
#task to "unrun".  The argument is the task id, which is everything in
#the id after the %s:: in the output of a call to hwrf_datastore.py DUMP.

import logging,sys
import produtil.datastore

from produtil.datastore import Datastore,TASK_CATEGORY,UNSTARTED,COMPLETED

def unfail(ds):
    """!Marks all tasks as not having failed.
    @param ds the produtil.datastore.Datastore to modify."""
    with ds.transaction() as t:
        t.mutate("""UPDATE products SET available=? 
                      WHERE id LIKE '%s%%' AND 
                      NOT available=?"""%(TASK_CATEGORY),
                 (UNSTARTED,COMPLETED))

def unrun(ds):
    """!Marks all products as unavailable and tasks as unstarted.
    @param ds the produtil.datastore.Datastore to modify."""
    with ds.transaction() as t:
        t.mutate("UPDATE products SET available=?",(UNSTARTED,))

def unrun_one(ds,did):
    """!Marks a specific task as unstarted.
    @param ds the produtil.datastore.Datastore to modify.
    @param did the taskname"""
    with ds.transaction() as t:
        taskid="%s::%s"%(TASK_CATEGORY,str(did))
        print('Marking %s as unstarted.'%(taskid,), file=sys.stderr)
        t.mutate("UPDATE products SET available=? WHERE id=?",
                 (UNSTARTED,taskid))

def dump(ds):
    """!Dumps the contents of the given Datastore to stdout
    @param ds the produtil.datastore.Datastore to dump"""
    ds.dump()

def usage(args):
    """!Sends a program usage message to stderr and exits with status 2
    @param args the command-line arguments that were provided."""
    print('''FORMAT: hwrf_datastore.py OP [ARG] file1.sqlite3 [file2.sqlite3 [...]]
where OP is one of:
  DUMP   - dump entire database to stdout
  UNFAIL - mark all failed or running tasks as unstarted
  UNRUN  - mark all tasks as unstarted
  UNRUN_ONE - see below
Only UNRUN_ONE takes an argument, and that argument is mandatory: the
task to "unrun".  The argument is the task id, which is everything in
the id after the %s:: in the output of ab hwrf_datastore.py DUMP.
'''%(TASK_CATEGORY,), file=sys.stderr)
    for arg in args:
        print(arg, file=sys.stderr)
    sys.exit(2)

def main():
    """!Main program.  Parses arguments and calls other functions in
    this program to do the real work."""
    if len(sys.argv)<3: usage()
    
    first_arg=2
    opargs=[]
    readonly=False
    if   sys.argv[1].upper()=='UNFAIL':    op=unfail
    elif sys.argv[1].upper()=='DUMP':      op=dump
    elif sys.argv[1].upper()=='UNRUN':     op=unrun
    elif sys.argv[1].upper()=='UNRUN_ONE':
        op=unrun_one
        opargs=[sys.argv[2]]
        first_arg=3
    else:
        usage('Unrecognized datastore operation %s'%(sys.argv[1],))
    
    if len(sys.argv)<first_arg+1:    usage()
    
    if op is dump:   readonly=True
    
    logging.basicConfig(stream=sys.stderr,level=logging.INFO)
    for filename in sys.argv[first_arg:]:
        ds=Datastore(filename,logger=logging.getLogger(),locking=not readonly)
        with ds.transaction() as t:
            op(ds,*opargs)

if __name__=='__main__': main()