#!/usr/bin/python
#
#    test-log.py: this file is part of the GRS suite
#    Copyright (C) 2015  Anthony G. Basile
#
#    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, either version 3 of the License, or
#    (at your option) any later version.
#
#    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/>.

import os
import sys
sys.path.append(os.path.abspath('..'))

import hashlib
import shutil
from grs import Log

logdir = '/tmp/test-log'

def doit(lo, stamped = False):
    # Create a log with knowing contents and rotate 3 times.
    for i in range(10):
        lo.log('first %d' % i, stamped)
    lo.rotate_logs()
    lo.rotate_logs()
    lo.rotate_logs()
    for i in list(range(9,-1,-1)):
        lo.log('second %d' % i, stamped)


def hashtest(expect_pass = True):
    # Hash up our log and three rotations.  Do we get what we expected?
    m = hashlib.md5()
    for i in [ '', '.0', '.1', '.2']:
        log = os.path.join(logdir, 'test.log%s' % i)
        with open(log, 'r') as f:
            m.update(f.read().encode('ascii'))
    if expect_pass:
        assert(m.hexdigest() == '485b8bf3a9e08bd5ccfdff7e1a8fe4e1')
    else:
        assert(m.hexdigest() != '485b8bf3a9e08bd5ccfdff7e1a8fe4e1')

if __name__ == "__main__":
    if os.path.isdir(logdir):
        shutil.rmtree(logdir)
    os.makedirs(logdir)
    logfile = os.path.join(logdir, 'test.log')
    lo = Log(logfile)

    doit(lo, stamped=False)
    hashtest(expect_pass=True)
    doit(lo, stamped=True)
    hashtest(expect_pass=False)

    # Make sure we're dropping past the upper limit.
    lo.rotate_logs(upper_limit=2)
    assert(os.path.isfile(logfile))
    assert(os.path.isfile(logfile+'.0'))
    assert(os.path.isfile(logfile+'.1'))
    assert(os.path.isfile(logfile+'.2'))
    assert(not os.path.isfile(logfile+'.3'))
    assert(not os.path.isfile(logfile+'.4'))
    assert(not os.path.isfile(logfile+'.5'))