# Copyright 2015  Lars Wirzenius
#
# 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/>.
#
# =*= License: GPL-3+ =*=


class Logger(object):

    def __init__(self):
        self._outputs = []
        self._indentation = 2
        self._level = 0

    def add_output_file(self, output, quiet=None):
        self._outputs.append((output, quiet))

    def drop_output_file(self, output):
        self._outputs = [(o, q) for o, q in self._outputs if o != output]

    def set_indentation(self, indentation):
        self._indentation = indentation

    def __enter__(self):
        self._level += 1

    def __exit__(self, *args):
        self._level -= 1

    def log(self, quietable, msg, **kwargs):
        indent = ' ' * self._indentation * self._level
        for f, quiet in self._outputs:
            if not quiet or not quietable:
                f.write(indent + msg.format(**kwargs) + '\n')
                f.flush()

    def important(self, msg, **kwargs):  # pragma: no cover
        self.log(False, msg, **kwargs)

    def chatty(self, msg, **kwargs):  # pragma: no cover
        self.log(True, msg, **kwargs)