'''
Package support for openSUSE via the zypper package manager
'''

# Import python libs
import copy
import logging
import re

# Import salt libs
import salt.utils

log = logging.getLogger(__name__)


def __virtual__():
    '''
    Set the virtual pkg module if the os is openSUSE
    '''
    if __grains__.get('os_family', '') != 'Suse':
        return False
    # Not all versions of Suse use zypper, check that it is available
    if not salt.utils.which('zypper'):
        return False
    return 'pkg'


def list_upgrades(refresh=True):
    '''
    List all available package upgrades on this system

    CLI Example::

        salt '*' pkg.list_upgrades
    '''
    if salt.utils.is_true(refresh):
        refresh_db()
    ret = {}
    out = __salt__['cmd.run_stdout']('zypper list-updates').splitlines()
    for line in out:
        if not line:
            continue
        if '|' not in line:
            continue
        try:
            status, repo, name, cur, avail, arch = \
                [x.strip() for x in line.split('|')]
        except (ValueError, IndexError):
            continue
        if status == 'v':
            ret[name] = avail
    return ret

# Provide a list_updates function for those used to using zypper list-updates
list_updates = list_upgrades


def latest_version(*names, **kwargs):
    '''
    Return the latest version of the named package available for upgrade or
    installation. If more than one package name is specified, a dict of
    name/version pairs is returned.

    If the latest version of a given package is already installed, an empty
    string will be returned for that package.

    CLI Example::

        salt '*' pkg.latest_version <package name>
        salt '*' pkg.latest_version <package1> <package2> <package3> ...
    '''
    if len(names) == 0:
        return ''

    ret = {}
    for name in names:
        ret[name] = ''

    # Refresh before looking for the latest version available
    if salt.utils.is_true(kwargs.get('refresh', True)):
        refresh_db()

    cmd = 'zypper info -t package {0}'.format(' '.join(names))
    output = __salt__['cmd.run_all'](cmd).get('stdout', '')
    output = re.split('Information for package \\S+:\n', output)
    for package in output:
        pkginfo = {}
        for line in package.splitlines():
            try:
                key, val = line.split(':', 1)
                key = key.lower()
                val = val.strip()
            except ValueError:
                continue
            else:
                pkginfo[key] = val

        # Ignore if the needed keys weren't found in this iteration
        if not set(('name', 'version', 'status')) <= set(pkginfo.keys()):
            continue

        status = pkginfo['status'].lower()
        if 'not installed' in status or 'out-of-date' in status:
            ret[pkginfo['name']] = pkginfo['version']

    # Return a string if only one package name passed
    if len(names) == 1:
        return ret[names[0]]
    return ret

# available_version is being deprecated
available_version = latest_version


def upgrade_available(name):
    '''
    Check whether or not an upgrade is available for a given package

    CLI Example::

        salt '*' pkg.upgrade_available <package name>
    '''
    return latest_version(name) != ''


def version(*names, **kwargs):
    '''
    Returns a string representing the package version or an empty string if not
    installed. If more than one package name is specified, a dict of
    name/version pairs is returned.

    CLI Example::

        salt '*' pkg.version <package name>
        salt '*' pkg.version <package1> <package2> <package3> ...
    '''
    return __salt__['pkg_resource.version'](*names, **kwargs)


def list_pkgs(versions_as_list=False, **kwargs):
    '''
    List the packages currently installed as a dict::

        {'<package_name>': '<version>'}

    CLI Example::

        salt '*' pkg.list_pkgs
    '''
    versions_as_list = salt.utils.is_true(versions_as_list)
    # 'removed' not yet implemented or not applicable
    if salt.utils.is_true(kwargs.get('removed')):
        return {}

    if 'pkg.list_pkgs' in __context__:
        if versions_as_list:
            return __context__['pkg.list_pkgs']
        else:
            ret = copy.deepcopy(__context__['pkg.list_pkgs'])
            __salt__['pkg_resource.stringify'](ret)
            return ret

    cmd = 'rpm -qa --queryformat "%{NAME}_|-%{VERSION}_|-%{RELEASE}\n"'
    ret = {}
    for line in __salt__['cmd.run'](cmd).splitlines():
        name, pkgver, rel = line.split('_|-')
        if rel:
            pkgver += '-{0}'.format(rel)
        __salt__['pkg_resource.add_pkg'](ret, name, pkgver)

    __salt__['pkg_resource.sort_pkglist'](ret)
    __context__['pkg.list_pkgs'] = copy.deepcopy(ret)
    if not versions_as_list:
        __salt__['pkg_resource.stringify'](ret)
    return ret


def refresh_db():
    '''
    Just run a ``zypper refresh``, return a dict::

        {'<database name>': Bool}

    CLI Example::

        salt '*' pkg.refresh_db
    '''
    cmd = 'zypper refresh'
    ret = {}
    out = __salt__['cmd.run'](cmd).splitlines()
    for line in out:
        if not line:
            continue
        if line.strip().startswith('Repository'):
            key = line.split("'")[1].strip()
            if 'is up to date' in line:
                ret[key] = False
        elif line.strip().startswith('Building'):
            key = line.split("'")[1].strip()
            if 'done' in line:
                ret[key] = True
    return ret


def install(name=None,
            refresh=False,
            pkgs=None,
            sources=None,
            **kwargs):
    '''
    Install the passed package(s), add refresh=True to run 'zypper refresh'
    before package is installed.

    name
        The name of the package to be installed. Note that this parameter is
        ignored if either "pkgs" or "sources" is passed. Additionally, please
        note that this option can only be used to install packages from a
        software repository. To install a package file manually, use the
        "sources" option.

        CLI Example::
            salt '*' pkg.install <package name>

    refresh
        Whether or not to refresh the package database before installing.

    version
        Can be either a version number, or the combination of a comparison
        operator (<, >, <=, >=, =) and a version number (ex. '>1.2.3-4').
        This parameter is ignored if "pkgs" or "sources" is passed.


    Multiple Package Installation Options:

    pkgs
        A list of packages to install from a software repository. Must be
        passed as a python list. A specific version number can be specified
        by using a single-element dict representing the package and its
        version. As with the ``version`` parameter above, comparison operators
        can be used to target a specific version of a package.

        CLI Examples::
            salt '*' pkg.install pkgs='["foo", "bar"]'
            salt '*' pkg.install pkgs='["foo", {"bar": "1.2.3-4"}]'
            salt '*' pkg.install pkgs='["foo", {"bar": "<1.2.3-4"}]'

    sources
        A list of RPM packages to install. Must be passed as a list of dicts,
        with the keys being package names, and the values being the source URI
        or local path to the package.

        CLI Example::
            salt '*' pkg.install sources='[{"foo": "salt://foo.rpm"},{"bar": "salt://bar.rpm"}]'


    Returns a dict containing the new package names and versions::

        {'<package>': {'old': '<old-version>',
                       'new': '<new-version>'}}
    '''
    if salt.utils.is_true(refresh):
        refresh_db()

    pkg_params, pkg_type = __salt__['pkg_resource.parse_targets'](name,
                                                                  pkgs,
                                                                  sources,
                                                                  **kwargs)
    if pkg_params is None or len(pkg_params) == 0:
        return {}

    version_num = kwargs.get('version')
    if version_num:
        if pkgs is None and sources is None:
            # Allow "version" to work for single package target
            pkg_params = {name: version_num}
        else:
            log.warning('"version" parameter will be ignored for multiple '
                        'package targets')

    if pkg_type == 'repository':
        targets = []
        problems = []
        for param, version_num in pkg_params.iteritems():
            if version_num is None:
                targets.append(param)
            else:
                match = re.match('^([<>])?(=)?([^<>=]+)$', version_num)
                if match:
                    gt_lt, eq, verstr = match.groups()
                    prefix = gt_lt or ''
                    prefix += eq or ''
                    # If no prefix characters were supplied, use '='
                    prefix = prefix or '='
                    targets.append('{0}{1}{2}'.format(param, prefix, verstr))
                    log.debug(targets)
                else:
                    msg = 'Invalid version string "{0}" for package ' \
                          '"{1}"'.format(version_num, name)
                    problems.append(msg)
        if problems:
            for problem in problems:
                log.error(problem)
            return {}
    else:
        targets = pkg_params

    old = list_pkgs()
    # Quotes needed around package targets because of the possibility of output
    # redirection characters "<" or ">" in zypper command.
    cmd = 'zypper -n install -l "{0}"'.format('" "'.join(targets))
    stdout = __salt__['cmd.run_all'](cmd).get('stdout', '')
    downgrades = []
    for line in stdout.splitlines():
        match = re.match("^The selected package '([^']+)'.+has lower version",
                         line)
        if match:
            downgrades.append(match.group(1))
    if downgrades:
        cmd = 'zypper -n install -l --force {0}'.format(' '.join(downgrades))
        __salt__['cmd.run_all'](cmd)
    __context__.pop('pkg.list_pkgs', None)
    new = list_pkgs()
    return __salt__['pkg_resource.find_changes'](old, new)


def upgrade(refresh=True):
    '''
    Run a full system upgrade, a zypper upgrade

    Return a dict containing the new package names and versions::

        {'<package>': {'old': '<old-version>',
                       'new': '<new-version>'}}

    CLI Example::

        salt '*' pkg.upgrade
    '''
    if salt.utils.is_true(refresh):
        refresh_db()
    old = list_pkgs()
    cmd = 'zypper -n up -l'
    __salt__['cmd.run_all'](cmd)
    __context__.pop('pkg.list_pkgs', None)
    new = list_pkgs()
    return __salt__['pkg_resource.find_changes'](old, new)


def _uninstall(action='remove', name=None, pkgs=None):
    '''
    remove and purge do identical things but with different zypper commands,
    this function performs the common logic.
    '''
    purge_arg = '-u' if action == 'purge' else ''
    pkg_params = __salt__['pkg_resource.parse_targets'](name, pkgs)[0]
    old = list_pkgs()
    targets = [x for x in pkg_params if x in old]
    if not targets:
        return {}
    cmd = 'zypper -n remove {0} {1}'.format(purge_arg, ' '.join(targets))
    __salt__['cmd.run_all'](cmd)
    __context__.pop('pkg.list_pkgs', None)
    new = list_pkgs()
    return __salt__['pkg_resource.find_changes'](old, new)


def remove(name=None, pkgs=None, **kwargs):
    '''
    Remove packages with ``zypper -n remove``

    name
        The name of the package to be deleted.


    Multiple Package Options:

    pkgs
        A list of packages to delete. Must be passed as a python list. The
        ``name`` parameter will be ignored if this option is passed.

    .. versionadded:: 0.16.0


    Returns a dict containing the changes.

    CLI Example::

        salt '*' pkg.remove <package name>
        salt '*' pkg.remove <package1>,<package2>,<package3>
        salt '*' pkg.remove pkgs='["foo", "bar"]'
    '''
    return _uninstall(action='remove', name=name, pkgs=pkgs)


def purge(name=None, pkgs=None, **kwargs):
    '''
    Recursively remove a package and all dependencies which were installed
    with it, this will call a ``zypper -n remove -u``

    name
        The name of the package to be deleted.


    Multiple Package Options:

    pkgs
        A list of packages to delete. Must be passed as a python list. The
        ``name`` parameter will be ignored if this option is passed.

    .. versionadded:: 0.16.0


    Returns a dict containing the changes.

    CLI Example::

        salt '*' pkg.purge <package name>
        salt '*' pkg.purge <package1>,<package2>,<package3>
        salt '*' pkg.purge pkgs='["foo", "bar"]'
    '''
    return _uninstall(action='purge', name=name, pkgs=pkgs)


def perform_cmp(pkg1='', pkg2=''):
    '''
    Do a cmp-style comparison on two packages. Return -1 if pkg1 < pkg2, 0 if
    pkg1 == pkg2, and 1 if pkg1 > pkg2. Return None if there was a problem
    making the comparison.

    CLI Example::

        salt '*' pkg.perform_cmp '0.2.4-0' '0.2.4.1-0'
        salt '*' pkg.perform_cmp pkg1='0.2.4-0' pkg2='0.2.4.1-0'
    '''
    return __salt__['pkg_resource.perform_cmp'](pkg1=pkg1, pkg2=pkg2)


def compare(pkg1='', oper='==', pkg2=''):
    '''
    Compare two version strings.

    CLI Example::

        salt '*' pkg.compare '0.2.4-0' '<' '0.2.4.1-0'
        salt '*' pkg.compare pkg1='0.2.4-0' oper='<' pkg2='0.2.4.1-0'
    '''
    return __salt__['pkg_resource.compare'](pkg1=pkg1, oper=oper, pkg2=pkg2)
