#!/usr/bin/env python
# Michael Cohen <scudette@users.sourceforge.net>
# David Collett <daveco@users.sourceforge.net>
#
# ******************************************************
#  Version: FLAG $Version: 0.87-pre1 Date: Thu Jun 12 00:48:38 EST 2008$
# ******************************************************
#
# * 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 2
# * 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, write to the Free Software
# * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
# ******************************************************
""" Implement a simple logger wrapper.

logging verbosity is controlled through the configuration variable LOG_LEVEL
"""
import pyflag.conf
config = pyflag.conf.ConfObject()

import sys,traceback,time,threading,os

## Declare the parameters we need:
config.add_option("LOG_LEVEL", default=10, type='int', short_option='v',
                  help="Logging level")

config.add_option("LOGFILE", default="/dev/stderr",
                  help="Send log messages to this file")

## These are predefined logging levels:
ERRORS=1
ERROR=1
WARNINGS=3
WARNING=3
INFO=5
DEBUG=7
VERBOSE_DEBUG=12

ring_buffer = []

lookup = {
    ERRORS: "Critical Error",
    WARNINGS: "Warning",
    INFO:"Infomation",
    DEBUG:"Debug",
    VERBOSE_DEBUG: "Debug++",
    }

def log(level,message, *args):
    """ Prints the message out only if the configured verbosity is higher than the message's level."""
    if config.LOG_LEVEL >= level:
        try:
            log_fd = open(config.LOGFILE,"ab")
        except Exception,e:
            log_fd = sys.stderr

        import pyflag.DB as DB

        try:
            string = DB.expand("%s(%s): %s" % (os.getpid(),lookup[level],message), args)
        except Exception,e:
            log_fd.write("%s\n" % e)
            string = message

        import pyflag.FlagFramework as FlagFramework
        
        log_fd.write(FlagFramework.smart_str(string) + "\n")
        log_fd.flush()
        
    if level<=ERRORS and level>0:
        log_fd.write("%s\n" % string)
        log_fd.write("%s\n" % traceback.print_tb(sys.exc_info()[2]))
        log_fd.flush()

def render_system_messages(result):
    ## This does nothing now
    return
    result.row("System messages:")
    import pyflag.DB as DB
    
    dbh = DB.DBO()
    dbh.execute("select count(*) as size from logs")
    size = dbh.fetch()['size']
    pagesize=20
    dbh.execute("select timestamp,level,message from logs limit %s, %s", (max(size-pagesize,0), pagesize))
    data = '\n'.join(["%(timestamp)s(%(level)s): %(message)s" % row for row in dbh])
    tmp=result.__class__(result)
    tmp.text(data,font='typewriter',style="red")
    result.row(tmp)