# -*- coding: utf-8 -*-
#
# Picard, the next-generation MusicBrainz tagger
# Copyright (C) 2006 Lukáš Lalinský
#
# 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

import os.path
from PyQt4 import QtCore
from picard.util import LockableObject, rot13


class ConfigError(Exception):
    pass


class ConfigSection(LockableObject):
    """Configuration section."""

    def __init__(self, config, name):
        LockableObject.__init__(self)
        self.__config = config
        self.__name = name

    def __getitem__(self, name):
        self.lock_for_read()
        try:
            opt = Option.get(self.__name, name)
            key = "%s/%s" % (self.__name, name)
            if self.__config.contains(key):
                return opt.convert(self.__config.value(key))
            return opt.default
        finally:
            self.unlock()

    def __setitem__(self, name, value):
        self.lock_for_write()
        try:
            self.__config.setValue("%s/%s" % (self.__name, name),
                                  QtCore.QVariant(value))
        finally:
            self.unlock()


class Config(QtCore.QSettings):
    """Configuration."""

    def __init__(self):
        """Initializes the configuration."""
        QtCore.QSettings.__init__(self, "MusicBrainz", "Picard")
        self.setting = ConfigSection(self, "setting")
        self.persist = ConfigSection(self, "persist")
        self.profile = ConfigSection(self, "profile/default")
        self.current_preset = "default"

    def switchProfile(self, profilename):
        """Sets the current profile."""
        key = u"profile/%s" % (profilename,)
        if self.contains(key):
            self.profile.name = key
        else:
            raise ConfigError, "Unknown profile '%s'" % (profilename,) 


class Option(QtCore.QObject):
    """Generic option."""

    registry = {}

    def __init__(self, section, name, default, convert=None):
        self.section = section
        self.name = name
        self.default = default
        self.convert = convert
        if not self.convert:
            self.convert = type(self.default)
        self.registry[(self.section, self.name)] = self

    @classmethod
    def get(cls, section, name):
        try:
            return cls.registry[(section, name)]
        except KeyError:
            raise KeyError, "Option %s.%s not found." % (section, name)


class TextOption(Option):
    """Option with a text value."""

    def __init__(self, section, name, default):
        def convert(value):
            return unicode(value.toString())
        Option.__init__(self, section, name, default, convert)


class BoolOption(Option):
    """Option with a boolean value."""

    def __init__(self, section, name, default):
        Option.__init__(self, section, name, default, QtCore.QVariant.toBool)


class IntOption(Option):
    """Option with an integer value."""

    def __init__(self, section, name, default):
        def convert(value):
            return value.toInt()[0]
        Option.__init__(self, section, name, default, convert)


class FloatOption(Option):
    """Option with a float value."""

    def __init__(self, section, name, default):
        def convert(value):
            return value.toDouble()[0]
        Option.__init__(self, section, name, default, convert)


class PasswordOption(Option):
    """Super l33t h3ckery!"""

    def __init__(self, section, name, default):
        def convert(value):
            return rot13(unicode(value.toString()))
        Option.__init__(self, section, name, default, convert)
