# @author Donovan Preston
# 
# Copyright (c) 2006-2007, Linden Research, Inc.
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

import syslog
import logging


def file_logger(filename):
    """Create a logger. This sucks, the logging module sucks, but
    it'll do for now.
    """
    handler = logging.FileHandler(filename)
    formatter = logging.Formatter()
    handler.setFormatter(formatter)
    log = logging.getLogger(filename)
    log.addHandler(handler)
    log.setLevel(logging.DEBUG)
    return log, handler


def stream_logger(stream):
    """Create a logger. This sucks."""
    handler = logging.StreamHandler(stream)
    formatter = logging.Formatter()
    handler.setFormatter(formatter)
    log = logging.getLogger()
    log.addHandler(handler)
    log.setLevel(logging.DEBUG)
    return log, handler


class LineLogger(object):
    towrite = ''
    def __init__(self, emit=None):
        if emit is not None:
            self.emit = emit

    def write(self, stuff):
        self.towrite += stuff
        if '\n' in self.towrite:
            self.flush()

    def flush(self):
        try:
            newline = self.towrite.index('\n')
        except ValueError:
            newline = len(self.towrite)
        while True:
            self.emit(self.towrite[:newline])
            self.towrite = self.towrite[newline+1:]
            try:
                newline = self.towrite.index('\n')
            except ValueError:
                break

    def close(self):
        pass

    def emit(self, *args):
        pass


class SysLogger(LineLogger):
    """A file-like object which writes to syslog. Can be inserted
    as sys.stdin and sys.stderr to have logging output redirected
    to syslog.
    """
    def __init__(self, priority):
        self.priority = priority

    def emit(self, line):
        syslog.syslog(self.priority, line)


class TeeLogger(LineLogger):
    def __init__(self, one, two):
        self.one, self.two = one, two

    def emit(self, line):
        self.one.emit(line)
        self.two.emit(line)


class FileLogger(LineLogger):
    def __init__(self, file):
        self.file = file

    def emit(self, line):
        self.file.write(line + '\n')
        self.file.flush()