#!/usr/bin/env python
# vim: set fileencoding=utf-8 :
# Pedro Tome <Pedro.Tome@idiap.ch>
# Laurent El Shafey <laurent.el-shafey@idiap.ch>
#
# Copyright (C) 2014 Idiap Research Institute, Martigny, Switzerland
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, version 3 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.

"""Bob Database Driver entry-point for the UTFVP
"""

import os
import sys
from bob.db.base.driver import Interface as BaseInterface


def dumplist(args):
  """Dumps lists of files based on your criteria"""

  from .query import Database
  db = Database()

  model_ids = None
  if args.models is not None:
    if isinstance(args.models, (list, tuple)): model_ids = args.models
    else: model_ids = (args.models,)
  r = db.objects(
      protocol=args.protocol,
      purposes=args.purpose,
      model_ids=model_ids,
      groups=args.group,
      classes=args.sclass
  )

  output = sys.stdout
  if args.selftest:
    from bob.db.base.utils import null
    output = null()

  for f in r:
    output.write('%s\n' % (f.make_path(args.directory, args.extension),))

  return 0


def checkfiles(args):
  """Checks existence of files based on your criteria"""

  from .query import Database
  db = Database()

  r = db.objects()

  # go through all files, check if they are available on the filesystem
  good = []
  bad = []
  for f in r:
    if os.path.exists(f.make_path(args.directory, args.extension)):
      good.append(f)
    else:
      bad.append(f)

  # report
  output = sys.stdout
  if args.selftest:
    from bob.db.base.utils import null
    output = null()

  if bad:
    for f in bad:
      output.write('Cannot find file "%s"\n' % (f.make_path(args.directory, args.extension),))
    output.write('%d files (out of %d) were not found at "%s"\n' % \
      (len(bad), len(r), args.directory))

  return 0


def reverse(args):
  """Returns a list of file database identifiers given the path stems"""

  from .query import Database
  db = Database()

  output = sys.stdout
  if args.selftest:
    from bob.db.base.utils import null
    output = null()

  r = db.reverse(args.path)
  for f in r: output.write('%d\n' % f.id)

  if not r: return 1

  return 0


def path(args):
  """Returns a list of fully formed paths or stems given some file id"""

  from .query import Database
  db = Database()

  output = sys.stdout
  if args.selftest:
    from bob.db.base.utils import null
    output = null()

  r = db.paths(args.id, prefix=args.directory, suffix=args.extension)
  for path in r: output.write('%s\n' % path)

  if not r: return 1

  return 0


class Interface(BaseInterface):

  def name(self):
    return 'utfvp'

  def version(self):
    import pkg_resources  # part of setuptools
    return pkg_resources.require('bob.db.%s' % self.name())[0].version

  def files(self):

    from pkg_resources import resource_filename
    raw_files = ('db.sql3',)
    return [resource_filename(__name__, k) for k in raw_files]

  def type(self):
    return 'sqlite'

  def add_commands(self, parser):

    from . import __doc__ as docs

    subparsers = self.setup_parser(parser,
        "UTFVP database", docs)

    # example: get the "create" action from a submodule
    from .create import add_command as create_command
    create_command(subparsers)

    # example: get the "dumplist" action from a submodule
    from .query import Database
    import argparse
    db = Database()

    parser = subparsers.add_parser('dumplist', help=dumplist.__doc__)
    parser.add_argument('-d', '--directory', default='', help="if given, this path will be prepended to every entry returned.")
    parser.add_argument('-e', '--extension', default='', help="if given, this extension will be appended to every entry returned.")
    parser.add_argument('-p', '--protocol', help="if given, limits the dump to a particular subset of the data that corresponds to the given protocol.", choices=db.protocol_names() if db.is_valid() else ())
    parser.add_argument('-u', '--purpose', help="if given, this value will limit the output files to those designed for the given purposes.", choices=db.purposes() if db.is_valid() else ())
    parser.add_argument('-m', '--models', type=str, help="if given, limits the dump to a particular model", choices=db.model_ids() if db.is_valid() else ())
    parser.add_argument('-g', '--group', help="if given, this value will limit the output files to those belonging to a particular protocolar group.", choices=db.groups() if db.is_valid() else ())
    parser.add_argument('-c', '--class', dest='sclass', help="if given, this value will limit the output files to those belonging to the given classes.", choices=('client', 'impostor'))
    parser.add_argument('--self-test', dest="selftest", action='store_true', help=argparse.SUPPRESS)
    parser.set_defaults(func=dumplist) #action

    # the "checkfiles" action
    parser = subparsers.add_parser('checkfiles', help=checkfiles.__doc__)
    parser.add_argument('-d', '--directory', default='', help="if given, this path will be prepended to every entry returned.")
    parser.add_argument('-e', '--extension', default='', help="if given, this extension will be appended to every entry returned.")
    parser.add_argument('--self-test', dest="selftest", action='store_true', help=argparse.SUPPRESS)
    parser.set_defaults(func=checkfiles) #action

    # adds the "reverse" command
    parser = subparsers.add_parser('reverse', help=reverse.__doc__)
    parser.add_argument('path', nargs='+', type=str, help="one or more path stems to look up. If you provide more than one, files which cannot be reversed will be omitted from the output.")
    parser.add_argument('--self-test', dest="selftest", action='store_true', help=argparse.SUPPRESS)
    parser.set_defaults(func=reverse) #action

    # adds the "path" command
    parser = subparsers.add_parser('path', help=path.__doc__)
    parser.add_argument('-d', '--directory', default='', help="if given, this path will be prepended to every entry returned.")
    parser.add_argument('-e', '--extension', default='', help="if given, this extension will be appended to every entry returned.")
    parser.add_argument('id', nargs='+', type=int, help="one or more file ids to look up. If you provide more than one, files which cannot be found will be omitted from the output. If you provide a single id to lookup, an error message will be printed if the id does not exist in the database. The exit status will be non-zero in such case.")
    parser.add_argument('--self-test', dest="selftest", action='store_true', help=argparse.SUPPRESS)
    parser.set_defaults(func=path) #action