# dnf configuration classes.
#
# Copyright (C) 2016-2017 Red Hat, Inc.
#
# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions of
# the GNU General Public License v.2, or (at your option) any later version.
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY expressed or implied, including the implied warranties 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.  Any Red Hat trademarks that are incorporated in the
# source code or documentation are not subject to the GNU General Public
# License and may only be used or replicated with the express permission of
# Red Hat, Inc.
#

from __future__ import absolute_import
from __future__ import unicode_literals

from dnf.yum import misc
from dnf.i18n import ucd, _
from dnf.pycomp import basestring, urlparse

import fnmatch
import dnf.conf.substitutions
import dnf.const
import dnf.exceptions
import dnf.pycomp
import dnf.util
import hawkey
import logging
import os
import libdnf.conf
import libdnf.repo
import tempfile

PRIO_EMPTY = libdnf.conf.Option.Priority_EMPTY
PRIO_DEFAULT = libdnf.conf.Option.Priority_DEFAULT
PRIO_MAINCONFIG = libdnf.conf.Option.Priority_MAINCONFIG
PRIO_AUTOMATICCONFIG = libdnf.conf.Option.Priority_AUTOMATICCONFIG
PRIO_REPOCONFIG = libdnf.conf.Option.Priority_REPOCONFIG
PRIO_PLUGINDEFAULT = libdnf.conf.Option.Priority_PLUGINDEFAULT
PRIO_PLUGINCONFIG = libdnf.conf.Option.Priority_PLUGINCONFIG
PRIO_COMMANDLINE = libdnf.conf.Option.Priority_COMMANDLINE
PRIO_RUNTIME = libdnf.conf.Option.Priority_RUNTIME

logger = logging.getLogger('dnf')


class BaseConfig(object):
    """Base class for storing configuration definitions.

       Subclass when creating your own definitions.

    """

    def __init__(self, config=None, section=None, parser=None):
        self.__dict__["_config"] = config
        self._section = section

    def __getattr__(self, name):
        if "_config" not in self.__dict__:
            raise AttributeError("'{}' object has no attribute '{}'".format(self.__class__, name))
        option = getattr(self._config, name)
        if option is None:
            return None
        try:
            value = option().getValue()
        except Exception as ex:
            return None
        if isinstance(value, str):
            return ucd(value)
        return value

    def __setattr__(self, name, value):
        option = getattr(self._config, name, None)
        if option is None:
            # unknown config option, store to BaseConfig only
            return super(BaseConfig, self).__setattr__(name, value)
        self._set_value(name, value, PRIO_RUNTIME)

    def __str__(self):
        out = []
        out.append('[%s]' % self._section)
        if self._config:
            for optBind in self._config.optBinds():
                try:
                    value = optBind.second.getValueString()
                except RuntimeError:
                    value = ""
                out.append('%s: %s' % (optBind.first, value))
        return '\n'.join(out)

    def _has_option(self, name):
        method = getattr(self._config, name, None)
        return method is not None

    def _get_value(self, name):
        method = getattr(self._config, name, None)
        if method is None:
            return None
        return method().getValue()

    def _get_priority(self, name):
        method = getattr(self._config, name, None)
        if method is None:
            return None
        return method().getPriority()

    def _set_value(self, name, value, priority=PRIO_RUNTIME):
        """Set option's value if priority is equal or higher
           than current priority."""
        method = getattr(self._config, name, None)
        if method is None:
            raise Exception("Option \"" + name + "\" does not exists")
        option = method()
        if value is None:
            try:
                option.set(priority, value)
            except Exception:
                pass
        else:
            try:
                if isinstance(value, list) or isinstance(value, tuple):
                    option.set(priority, libdnf.conf.VectorString(value))
                elif (isinstance(option, libdnf.conf.OptionBool)
                      or isinstance(option, libdnf.conf.OptionChildBool)
                      ) and isinstance(value, int):
                    option.set(priority, bool(value))
                else:
                    option.set(priority, value)
            except RuntimeError as e:
                raise dnf.exceptions.ConfigError(_("Error parsing '%s': %s")
                                                 % (value, str(e)),
                                                 raw_error=str(e))

    def _populate(self, parser, section, filename, priority=PRIO_DEFAULT):
        """Set option values from an INI file section."""
        if parser.hasSection(section):
            for name in parser.options(section):
                value = parser.getSubstitutedValue(section, name)
                if not value or value == 'None':
                    value = ''
                if hasattr(self._config, name):
                    try:
                        self._config.optBinds().at(name).newString(priority, value)
                    except RuntimeError as e:
                        logger.error(_('Invalid configuration value: %s=%s in %s; %s'),
                                     ucd(name), ucd(value), ucd(filename), str(e))
                else:
                    if name == 'arch' and hasattr(self, name):
                        setattr(self, name, value)
                    else:
                        logger.debug(
                            _('Unknown configuration option: %s = %s in %s'),
                            ucd(name), ucd(value), ucd(filename))

    def dump(self):
        # :api
        """Return a string representing the values of all the
           configuration options.
        """
        output = ['[%s]' % self._section]

        if self._config:
            for optBind in self._config.optBinds():
                # if not opt._is_runtimeonly():
                try:
                    output.append('%s = %s' % (optBind.first, optBind.second.getValueString()))
                except RuntimeError:
                    pass

        return '\n'.join(output) + '\n'

    def set_or_append_opt_value(self, name, value_string, priority=PRIO_RUNTIME):
        # :api
        """For standard options, sets the value of the option if the priority is equal to or higher
           than the current priority.
           For "append" options, appends the values parsed from value_string to the current list of values. If the first
           parsed element of the list of values is empty and the priority is equal to or higher than the current
           priority, the current list is replaced with the new values.
           If the priority is higher than the current priority, the current priority is increased to the priority.
           Raises dnf.exceptions.ConfigError if the option with the given name does not exist or value_string contains
           an invalid value or not allowed value.
        """
        opt_binds = self._config.optBinds()
        try:
            opt_binds.at(name).newString(priority, value_string)
        except RuntimeError as e:
            raise dnf.exceptions.ConfigError(
                _('Cannot set "{}" to "{}": {}').format(name, value_string, str(e)), str(e))

    @staticmethod
    def write_raw_configfile(filename, section_id, substitutions, modify):
        # :api
        """
        filename   - name of config file (.conf or .repo)
        section_id - id of modified section (e.g. main, fedora, updates)
        substitutions - instance of base.conf.substitutions
        modify     - dict of modified options
        """
        parser = libdnf.conf.ConfigParser()
        parser.read(filename)

        # b/c repoids can have $values in them we need to map both ways to figure
        # out which one is which
        if not parser.hasSection(section_id):
            for sect in parser.getData():
                if libdnf.conf.ConfigParser.substitute(sect, substitutions) == section_id:
                    section_id = sect

        for name, value in modify.items():
            if isinstance(value, list):
                value = ' '.join(value)
            parser.setValue(section_id, name, value)

        parser.write(filename, False)


class MainConf(BaseConfig):
    # :api
    """Configuration option definitions for dnf.conf's [main] section."""
    def __init__(self, section='main', parser=None):
        # pylint: disable=R0915
        config = libdnf.conf.ConfigMain()
        super(MainConf, self).__init__(config, section, parser)
        self._set_value('pluginpath', [dnf.const.PLUGINPATH], PRIO_DEFAULT)
        self._set_value('pluginconfpath', [dnf.const.PLUGINCONFPATH], PRIO_DEFAULT)
        self.substitutions = dnf.conf.substitutions.Substitutions()
        self.arch = hawkey.detect_arch()
        self._config.system_cachedir().set(PRIO_DEFAULT, dnf.const.SYSTEM_CACHEDIR)

        # setup different cache and log for non-privileged users
        if dnf.util.am_i_root():
            cachedir = dnf.const.SYSTEM_CACHEDIR
            logdir = '/var/log'
        else:
            try:
                cachedir = logdir = misc.getCacheDir()
            except (IOError, OSError) as e:
                msg = _('Could not set cachedir: {}').format(ucd(e))
                raise dnf.exceptions.Error(msg)

        self._config.cachedir().set(PRIO_DEFAULT, cachedir)
        self._config.logdir().set(PRIO_DEFAULT, logdir)

        # track list of temporary files created
        self.tempfiles = []

    def __del__(self):
        for file_name in self.tempfiles:
            os.unlink(file_name)

    @property
    def get_reposdir(self):
        # :api
        """Returns the value of reposdir"""
        myrepodir = None
        # put repo file into first reposdir which exists or create it
        for rdir in self._get_value('reposdir'):
            if os.path.exists(rdir):
                myrepodir = rdir
                break

        if not myrepodir:
            myrepodir = self._get_value('reposdir')[0]
            dnf.util.ensure_dir(myrepodir)
        return myrepodir

    def _check_remote_file(self, optname):
        """
        In case the option value is a remote URL, download it to the temporary location
        and use this temporary file instead.
        """
        prio = self._get_priority(optname)
        val = self._get_value(optname)
        if isinstance(val, basestring):
            location = urlparse.urlparse(val)
            if location[0] in ('file', ''):
                # just strip the file:// prefix
                self._set_value(optname, location.path, prio)
            else:
                downloader = libdnf.repo.Downloader()
                temp_fd, temp_path = tempfile.mkstemp(prefix='dnf-downloaded-config-')
                self.tempfiles.append(temp_path)
                try:
                    downloader.downloadURL(None, val, temp_fd)
                except RuntimeError as e:
                    raise dnf.exceptions.ConfigError(
                        _('Configuration file URL "{}" could not be downloaded:\n'
                          '  {}').format(val, str(e)))
                else:
                    self._set_value(optname, temp_path, prio)
                finally:
                    os.close(temp_fd)

    def _search_inside_installroot(self, optname):
        """
        Return root used as prefix for option (installroot or "/"). When specified from commandline
        it returns value from conf.installroot
        """
        installroot = self._get_value('installroot')
        if installroot == "/":
            return installroot
        prio = self._get_priority(optname)
        # don't modify paths specified on commandline
        if prio >= PRIO_COMMANDLINE:
            return installroot
        val = self._get_value(optname)
        # if it exists inside installroot use it (i.e. adjust configuration)
        # for lists any component counts
        if not isinstance(val, str):
            if any(os.path.exists(os.path.join(installroot, p.lstrip('/'))) for p in val):
                self._set_value(
                    optname,
                    libdnf.conf.VectorString([self._prepend_installroot_path(p) for p in val]),
                    prio
                )
                return installroot
        elif os.path.exists(os.path.join(installroot, val.lstrip('/'))):
            self._set_value(optname, self._prepend_installroot_path(val), prio)
            return installroot
        return "/"

    def prepend_installroot(self, optname):
        # :api
        prio = self._get_priority(optname)
        new_path = self._prepend_installroot_path(self._get_value(optname))
        self._set_value(optname, new_path, prio)

    def _prepend_installroot_path(self, path):
        root_path = os.path.join(self._get_value('installroot'), path.lstrip('/'))
        return libdnf.conf.ConfigParser.substitute(root_path, self.substitutions)

    def _configure_from_options(self, opts):
        """Configure parts of CLI from the opts """
        config_args = ['plugins', 'version', 'config_file_path',
                       'debuglevel', 'errorlevel', 'installroot',
                       'best', 'assumeyes', 'assumeno', 'clean_requirements_on_remove', 'gpgcheck',
                       'showdupesfromrepos', 'plugins', 'ip_resolve',
                       'rpmverbosity', 'disable_excludes', 'color',
                       'downloadonly', 'persistence', 'exclude', 'excludepkgs', 'skip_broken',
                       'tsflags', 'arch', 'basearch', 'ignorearch', 'cacheonly', 'comment']

        for name in config_args:
            value = getattr(opts, name, None)
            if value is not None and value != []:
                if self._has_option(name):
                    appendValue = False
                    if self._config:
                        try:
                            appendValue = self._config.optBinds().at(name).getAddValue()
                        except RuntimeError:
                            # fails if option with "name" does not exist in _config (libdnf)
                            pass
                    if appendValue:
                        add_priority = dnf.conf.PRIO_COMMANDLINE
                        if add_priority < self._get_priority(name):
                            add_priority = self._get_priority(name)
                        for item in value:
                            if item:
                                self._set_value(name, self._get_value(name) + [item], add_priority)
                            else:
                                self._set_value(name, [], dnf.conf.PRIO_COMMANDLINE)
                    else:
                        self._set_value(name, value, dnf.conf.PRIO_COMMANDLINE)
                elif hasattr(self, name):
                    setattr(self, name, value)
                else:
                    logger.warning(_('Unknown configuration option: %s = %s'),
                                   ucd(name), ucd(value))

        if getattr(opts, 'gpgcheck', None) is False:
            self._set_value("localpkg_gpgcheck", False, dnf.conf.PRIO_COMMANDLINE)

        if hasattr(opts, 'main_setopts'):
            # now set all the non-first-start opts from main from our setopts
            # pylint: disable=W0212
            for name, values in opts.main_setopts.items():
                for val in values:
                    if hasattr(self._config, name):
                        try:
                            # values in main_setopts are strings, try to parse it using newString()
                            self._config.optBinds().at(name).newString(PRIO_COMMANDLINE, val)
                        except RuntimeError as e:
                            raise dnf.exceptions.ConfigError(
                                _("Error parsing --setopt with key '%s', value '%s': %s")
                                % (name, val, str(e)), raw_error=str(e))
                    else:
                        # if config option with "name" doesn't exist in _config, it could be defined
                        # only in Python layer
                        if hasattr(self, name):
                            setattr(self, name, val)
                        else:
                            msg = _("Main config did not have a %s attr. before setopt")
                            logger.warning(msg, name)

    def exclude_pkgs(self, pkgs):
        # :api
        name = "excludepkgs"

        if pkgs is not None and pkgs != []:
            if self._has_option(name):
                self._set_value(name, pkgs, dnf.conf.PRIO_COMMANDLINE)
            else:
                logger.warning(_('Unknown configuration option: %s = %s'),
                               ucd(name), ucd(pkgs))

    def _adjust_conf_options(self):
        """Adjust conf options interactions"""

        skip_broken_val = self._get_value('skip_broken')
        if skip_broken_val:
            self._set_value('strict', not skip_broken_val, self._get_priority('skip_broken'))

    @property
    def releasever(self):
        # :api
        return self.substitutions.get('releasever')

    @releasever.setter
    def releasever(self, val):
        # :api
        """
        Sets the releasever variable and sets releasever_major and
        releasever_minor accordingly. releasever_major is set to the part of
        $releasever before the first ".". releasever_minor is set to the part
        after the first ".".
        """
        if val is None:
            self.substitutions.pop('releasever', None)
            return
        self.substitutions['releasever'] = str(val)

    @property
    def releasever_major(self):
        # :api
        return self.substitutions.get('releasever_major')

    @releasever_major.setter
    def releasever_major(self, val):
        # :api
        """
        Override the releasever_major variable, which is usually derived from
        the releasever variable. This setter does not update the value of
        $releasever.
        """
        if val is None:
            self.substitutions.pop('releasever_major', None)
            return
        self.substitutions['releasever_major'] = str(val)

    @property
    def releasever_minor(self):
        # :api
        return self.substitutions.get('releasever_minor')

    @releasever_minor.setter
    def releasever_minor(self, val):
        # :api
        """
        Override the releasever_minor variable, which is usually derived from
        the releasever variable. This setter does not update the value of
        $releasever.
        """
        if val is None:
            self.substitutions.pop('releasever_minor', None)
            return
        self.substitutions['releasever_minor'] = str(val)

    @property
    def arch(self):
        # :api
        return self.substitutions.get('arch')

    @arch.setter
    def arch(self, val):
        # :api

        if val is None:
            self.substitutions.pop('arch', None)
            return
        if val not in dnf.rpm._BASEARCH_MAP.keys():
            msg = _('Incorrect or unknown "{}": {}')
            raise dnf.exceptions.Error(msg.format("arch", val))
        self.substitutions['arch'] = val
        self.basearch = dnf.rpm.basearch(val)

    @property
    def basearch(self):
        # :api
        return self.substitutions.get('basearch')

    @basearch.setter
    def basearch(self, val):
        # :api

        if val is None:
            self.substitutions.pop('basearch', None)
            return
        if val not in dnf.rpm._BASEARCH_MAP.values():
            msg = _('Incorrect or unknown "{}": {}')
            raise dnf.exceptions.Error(msg.format("basearch", val))
        self.substitutions['basearch'] = val

    def read(self, filename=None, priority=PRIO_DEFAULT):
        # :api
        if filename is None:
            filename = self._get_value('config_file_path')
        parser = libdnf.conf.ConfigParser()
        try:
            parser.read(filename)
        except RuntimeError as e:
            raise dnf.exceptions.ConfigError(_('Parsing file "%s" failed: %s') % (filename, e))
        except IOError as e:
            logger.warning(e)
        self._populate(parser, self._section, filename, priority)

        # update to where we read the file from
        self._set_value('config_file_path', filename, priority)

    @property
    def verbose(self):
        return self._get_value('debuglevel') >= dnf.const.VERBOSE_LEVEL


class RepoConf(BaseConfig):
    """Option definitions for repository INI file sections."""

    def __init__(self, parent, section=None, parser=None):
        mainConfig = parent._config if parent else libdnf.conf.ConfigMain()
        super(RepoConf, self).__init__(libdnf.conf.ConfigRepo(mainConfig), section, parser)
        # Do not remove! Attribute is a reference holder.
        # Prevents premature removal of the mainConfig. The libdnf ConfigRepo points to it.
        self._mainConfigRefHolder = mainConfig
        if section:
            self._config.name().set(PRIO_DEFAULT, section)

    def _configure_from_options(self, opts):
        """Configure repos from the opts. """

        if getattr(opts, 'gpgcheck', None) is False:
            for optname in ['gpgcheck', 'repo_gpgcheck']:
                self._set_value(optname, False, dnf.conf.PRIO_COMMANDLINE)

        repo_setopts = getattr(opts, 'repo_setopts', {})
        for repoid, setopts in repo_setopts.items():
            if not fnmatch.fnmatch(self._section, repoid):
                continue
            for name, values in setopts.items():
                for val in values:
                    if hasattr(self._config, name):
                        try:
                            # values in repo_setopts are strings, try to parse it using newString()
                            self._config.optBinds().at(name).newString(PRIO_COMMANDLINE, val)
                        except RuntimeError as e:
                            raise dnf.exceptions.ConfigError(
                                _("Error parsing --setopt with key '%s.%s', value '%s': %s")
                                % (self._section, name, val, str(e)), raw_error=str(e))
                    else:
                        msg = _("Repo %s did not have a %s attr. before setopt")
                        logger.warning(msg, self._section, name)
