import os
import log
import rand

fn test_reopen() {
    if os.user_os() == 'windows' && os.getenv('SKIP_TEST_REOPEN') == '' {
        eprintln('skip renaming and reopening a log file on windows')
        exit(0)
    }
    lfolder := os.join_path(os.vtmp_dir(), rand.ulid())
    lpath1 := os.join_path(lfolder, 'current.log')
    lpath2 := os.join_path(lfolder, 'current.log.2')
    os.mkdir_all(lfolder)!

    dump(lfolder)
    mut l := log.new_thread_safe_log()
    l.set_level(.debug)
    l.set_full_logpath(lpath1)
    l.warn('one warning')
    l.error('one error')
    // simulate a log rotation, by moving the log file
    os.rename(lpath1, lpath2)!
    l.warn('another warning')
    // call reopen, note that the message from above, should be in the new file lpath2:
    l.reopen()!
    l.warn('third warning')
    l.flush()
    l.close()
    // os.system('ls -la ${lpath1} ${lpath2}')
    lcontent1 := os.read_file(lpath1)!
    lcontent2 := os.read_file(lpath2)!
    assert lcontent1.len > 0
    assert lcontent2.len > 0
    // the rotated log should have all messages before the l.reopen() call:
    assert lcontent2.contains('one warning')
    assert lcontent2.contains('one error')
    assert lcontent2.contains('another warning')
    // the log file that was reopened, should have only the new message:
    assert lcontent1.contains('third warning')
    assert !lcontent1.contains('one warning')

    os.rmdir_all(lfolder) or {}
}

fn test_set_always_flush() {
    log.set_level(.debug)
    lfolder := os.join_path(os.vtmp_dir(), rand.ulid())
    lpath1 := os.join_path(lfolder, 'current.log')
    os.mkdir_all(lfolder)!
    defer {
        os.rmdir_all(lfolder) or {}
    }
    dump(lfolder)
    mut l := log.Log{}
    l.set_level(.info)
    l.set_full_logpath(lpath1)
    l.set_always_flush(true)
    l.warn('one warning')
    l.info('one info message')
    l.error('one error')
    l.close()
    lcontent1 := os.read_file(lpath1)!
    assert lcontent1.len > 0
    assert lcontent1.contains('one warning')
    assert lcontent1.contains('one error')
    assert lcontent1.contains('one info message')
}