import sys
import os
import libprofile
import madpy
from madpy.madpack import configyml
from optparse import OptionParser

basic_numerics = '["MIN", "MAX", "AVG", "MADLIB_SCHEMA.cmsketch_median"]'
all_numerics = '["MIN", "MAX", "AVG", "MADLIB_SCHEMA.cmsketch_median", "MADLIB_SCHEMA.cmsketch_depth_histogram(%%,4)"]'
basic_non_numerics = '["MADLIB_SCHEMA.fmsketch_dcount"]'
all_non_numerics = '["MADLIB_SCHEMA.fmsketch_dcount", "MADLIB_SCHEMA.mfvsketch_quick_histogram(%%,10)"]'


def profile(table, numericaggs, non_numericaggs, configdir, skipcols):
  # if config file left unspecified, first check scriptdir.
  # if nothing there, take the installed version: madpy/Config.yml
  retval = ""
  
  if configdir == None:
      scriptdir = madpy.__path__[0] + "/config/scripts"
      if os.path.exists(scriptdir+"/Config.yml"):
          configdir = [scriptdir]
      else:
          configdir = madpy.__path__
  if numericaggs == None:
      numericaggs = basic_numerics
  if non_numericaggs == None:
      non_numericaggs = basic_non_numerics
  
  conf = configyml.get_config(configdir[0], False)        
  api = conf['dbapi2']
  connect_args = conf['connect_args']
  dbapi2 = __import__(api, globals(), locals(), [''])
  ## @var dbconn live database connection
  con_args={};
  for arg in connect_args:
      if arg.find("=") == -1:
          retval += sys.exc_info()[0]
          retval += "Missing '=' character in the connect_args parameter: " + arg
          raise
      # cleanup the string
      arg = ((arg.replace( "'", "")).replace( '"', '')).replace( ' ', '')            
      equal_sign = arg.find('=')
      # create a proper dictionary of connection parameters
      con_args[ arg[:equal_sign]] = arg[equal_sign+1:]
  conn = dbapi2.connect( **con_args)

  # Open a cursor to perform database operations
  cur = conn.cursor()

  (numcols, non_numcols) = libprofile.catalog_columns(conn, table, skipcols)
  query = libprofile.gen_profile_query(table,
                                      `eval'(numericaggs),
                                      `eval'(non_numericaggs),
                                      numcols, non_numcols)
  retval += query
  retval += "\n"
  retval += "---"
  retval += "\n"

  # Fetch numeric columnnames from table
  cur.execute(query)
  out = cur.fetchone()
  for i in range(`len'(out)):
      retval += cur.description[i][0]+": "+str(out[i])+"\n"
  cur.close()
  conn.close()
  
  return retval

def profile_run( table):
  if table == "":
    parser.error("missing tablename")
    sys.exit(2)

  return profile(table, all_numerics, all_non_numerics, None, [])
  
def main(argv):
  usage = """usage: %prog [options] tablename
     (note: database connection info taken from Config.yml, see -c flag)"""
  parser = OptionParser(usage=usage)
  parser.add_option("-n", "--numeric", dest="numericaggs", nargs = 1,
                    help="array of aggs for integer columns",
                    default=basic_numerics)
  parser.add_option("-t", "--nonnumeric", dest="non_numericaggs", nargs = 1,
                  help="array of aggs for non-numeric columns",
                  default=basic_non_numerics)
  parser.add_option("-k", "--kitchensink", action="store_true", dest="kitchen",
                  help="compute all available statistics", default=False)
  parser.add_option("-s", "--skip", dest="skipcols", nargs = 1,
                                  help="array of columns to skip",
                                  default='[]')
  parser.add_option('-c', '--configdir', nargs=1, dest='configdir',
                      default=None,
                      help="""directory holding Config.yml
  (default SCRIPTDIR if already initialized, else
  """
                           + madpy.__path__[0]+")")

  (options, args) = parser.parse_args()

  try:
    table = args[0]
  except:
    parser.error("missing tablename")
    sys.exit(2)

  if options.kitchen:
      numericaggs = all_numerics
      non_numericaggs = all_non_numerics
  else:
      numericaggs = None
      non_numericaggs = None

  if not options.configdir:
      options.configdir = None
  
  if not options.skipcols:
      options.skipcols = []
  
  print profile(table, numericaggs, non_numericaggs, options.configdir, options.skipcols)

if __name__ == "__main__":
    main(sys.argv[1:])