#!@PYTHON@

# Copyright (C) 2011  Internet Systems Consortium.
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SYSTEMS CONSORTIUM
# DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
# INTERNET SYSTEMS CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
# INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
# FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
# NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
# WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

import os, sqlite3, sys
from optparse import OptionParser

usage = 'usage: %prog [options] db_file'
parser = OptionParser(usage=usage)
parser.add_option("-u", "--upgrade", action="store_true",
                  dest="upgrade", default=False,
                  help="Upgrade the database file [default: %default]")
(options, args) = parser.parse_args()
if len(args) == 0:
    parser.error('missing argument')

db_file = args[0]

# If the file doesn't exist, there's nothing to do
if not os.path.exists(db_file):
    sys.exit(0)

conn = sqlite3.connect(db_file)
cur = conn.cursor()
try:
    # This can be anything that works iff the "diffs" table exists
    cur.execute('SELECT name FROM diffs DESC LIMIT 1')
except sqlite3.OperationalError as ex:
    # If it fails with 'no such table', create a new one or fail with
    # warning depending on the --upgrade command line option.
    if str(ex) == 'no such table: diffs':
        if options.upgrade:
            cur.execute('CREATE TABLE diffs (id INTEGER PRIMARY KEY, ' +
                        'zone_id INTEGER NOT NULL, ' +
                        'version INTEGER NOT NULL, ' +
                        'operation INTEGER NOT NULL, ' +
                        'name STRING NOT NULL COLLATE NOCASE, ' +
                        'rrtype STRING NOT NULL COLLATE NOCASE, ' +
                        'ttl INTEGER NOT NULL, rdata STRING NOT NULL)')
        else:
            sys.stdout.write('Found an older version of SQLite3 DB file: ' +
                             db_file + '\n' + "Perform '" + os.getcwd() +
                             "/sqlite3-difftbl-check.py --upgrade " +
                             db_file + "'\n" +
                             'before continuing install.\n')
            sys.exit(1)
conn.close()