# -*- coding: utf-8 -*-
'''
Support for rpm
'''

# Import python libs
from __future__ import absolute_import
import logging
import os
import re

# Import Salt libs
import salt.utils
import salt.utils.decorators as decorators
import salt.utils.pkg.rpm
# pylint: disable=import-error,redefined-builtin
from salt.ext.six.moves import shlex_quote as _cmd_quote
from salt.ext.six.moves import zip
# pylint: enable=import-error,redefined-builtin
from salt.exceptions import CommandExecutionError, SaltInvocationError

log = logging.getLogger(__name__)

# Define the module's virtual name
__virtualname__ = 'lowpkg'


def __virtual__():
    '''
    Confine this module to rpm based systems
    '''
    if not salt.utils.which('rpm'):
        return False
    try:
        os_grain = __grains__['os'].lower()
        os_family = __grains__['os_family'].lower()
    except Exception:
        return False

    enabled = ('amazon', 'xcp', 'xenserver')

    if os_family in ['redhat', 'suse'] or os_grain in enabled:
        return __virtualname__
    return False


def bin_pkg_info(path, saltenv='base'):
    '''
    .. versionadded:: 2015.8.0

    Parses RPM metadata and returns a dictionary of information about the
    package (name, version, etc.).

    path
        Path to the file. Can either be an absolute path to a file on the
        minion, or a salt fileserver URL (e.g. ``salt://path/to/file.rpm``).
        If a salt fileserver URL is passed, the file will be cached to the
        minion so that it can be examined.

    saltenv : base
        Salt fileserver envrionment from which to retrieve the package. Ignored
        if ``path`` is a local file path on the minion.

    CLI Example:

    .. code-block:: bash

        salt '*' lowpkg.bin_pkg_info /root/salt-2015.5.1-2.el7.noarch.rpm
        salt '*' lowpkg.bin_pkg_info salt://salt-2015.5.1-2.el7.noarch.rpm
    '''
    # If the path is a valid protocol, pull it down using cp.cache_file
    if __salt__['config.valid_fileproto'](path):
        newpath = __salt__['cp.cache_file'](path, saltenv)
        if not newpath:
            raise CommandExecutionError(
                'Unable to retrieve {0} from saltenv \'{1}\''
                .format(path, saltenv)
            )
        path = newpath
    else:
        if not os.path.exists(path):
            raise CommandExecutionError(
                '{0} does not exist on minion'.format(path)
            )
        elif not os.path.isabs(path):
            raise SaltInvocationError(
                '{0} does not exist on minion'.format(path)
            )

    # REPOID is not a valid tag for the rpm command. Remove it and replace it
    # with 'none'
    queryformat = salt.utils.pkg.rpm.QUERYFORMAT.replace('%{REPOID}', 'none')
    output = __salt__['cmd.run_stdout'](
        'rpm -qp --queryformat {0} {1}'.format(_cmd_quote(queryformat), path),
        output_loglevel='trace',
        ignore_retcode=True
    )
    ret = {}
    pkginfo = salt.utils.pkg.rpm.parse_pkginfo(
        output,
        osarch=__grains__['osarch']
    )
    for field in pkginfo._fields:
        ret[field] = getattr(pkginfo, field)
    return ret


def list_pkgs(*packages):
    '''
    List the packages currently installed in a dict::

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

    CLI Example:

    .. code-block:: bash

        salt '*' lowpkg.list_pkgs
    '''
    pkgs = {}
    if not packages:
        cmd = 'rpm -qa --qf \'%{NAME} %{VERSION}\\n\''
    else:
        cmd = 'rpm -q --qf \'%{{NAME}} %{{VERSION}}\\n\' {0}'.format(
            ' '.join(packages)
        )
    out = __salt__['cmd.run'](cmd, python_shell=False, output_loglevel='trace')
    for line in out.splitlines():
        if 'is not installed' in line:
            continue
        comps = line.split()
        pkgs[comps[0]] = comps[1]
    return pkgs


def verify(*package, **kwargs):
    '''
    Runs an rpm -Va on a system, and returns the results in a dict

    Files with an attribute of config, doc, ghost, license or readme in the
    package header can be ignored using the ``ignore_types`` keyword argument

    CLI Example:

    .. code-block:: bash

        salt '*' lowpkg.verify
        salt '*' lowpkg.verify httpd
        salt '*' lowpkg.verify 'httpd postfix'
        salt '*' lowpkg.verify 'httpd postfix' ignore_types=['config','doc']
    '''
    ftypes = {'c': 'config',
              'd': 'doc',
              'g': 'ghost',
              'l': 'license',
              'r': 'readme'}
    ret = {}
    ignore_types = kwargs.get('ignore_types', [])
    if package:
        packages = ' '.join(package)
        cmd = 'rpm -V {0}'.format(packages)
    else:
        cmd = 'rpm -Va'
    out = __salt__['cmd.run'](
            cmd,
            python_shell=False,
            output_loglevel='trace',
            ignore_retcode=True)
    for line in out.splitlines():
        fdict = {'mismatch': []}
        if 'missing' in line:
            line = ' ' + line
            fdict['missing'] = True
            del fdict['mismatch']
        fname = line[13:]
        if line[11:12] in ftypes:
            fdict['type'] = ftypes[line[11:12]]
        if 'type' not in fdict or fdict['type'] not in ignore_types:
            if line[0:1] == 'S':
                fdict['mismatch'].append('size')
            if line[1:2] == 'M':
                fdict['mismatch'].append('mode')
            if line[2:3] == '5':
                fdict['mismatch'].append('md5sum')
            if line[3:4] == 'D':
                fdict['mismatch'].append('device major/minor number')
            if line[4:5] == 'L':
                fdict['mismatch'].append('readlink path')
            if line[5:6] == 'U':
                fdict['mismatch'].append('user')
            if line[6:7] == 'G':
                fdict['mismatch'].append('group')
            if line[7:8] == 'T':
                fdict['mismatch'].append('mtime')
            if line[8:9] == 'P':
                fdict['mismatch'].append('capabilities')
            ret[fname] = fdict
    return ret


def modified(*packages, **flags):
    '''
    List the modified files that belong to a package. Not specifying any packages
    will return a list of _all_ modified files on the system's RPM database.

    .. versionadded:: 2015.5.0

    CLI examples:

    .. code-block:: bash

        salt '*' lowpkg.modified httpd
        salt '*' lowpkg.modified httpd postfix
        salt '*' lowpkg.modified
    '''
    ret = __salt__['cmd.run_all'](
        ['rpm', '-Va'] + list(packages),
        python_shell=False,
        output_loglevel='trace')

    data = {}

    # If verification has an output, then it means it failed
    # and the return code will be 1. We are interested in any bigger
    # than 1 code.
    if ret['retcode'] > 1:
        del ret['stdout']
        return ret
    elif not ret['retcode']:
        return data

    ptrn = re.compile(r"\s+")
    changes = cfg = f_name = None
    for f_info in ret['stdout'].splitlines():
        f_info = ptrn.split(f_info)
        if len(f_info) == 3:  # Config file
            changes, cfg, f_name = f_info
        else:
            changes, f_name = f_info
            cfg = None
        keys = ['size', 'mode', 'checksum', 'device', 'symlink',
                'owner', 'group', 'time', 'capabilities']
        changes = list(changes)
        if len(changes) == 8:  # Older RPMs do not support capabilities
            changes.append(".")
        stats = []
        for k, v in zip(keys, changes):
            if v != '.':
                stats.append(k)
        if cfg is not None:
            stats.append('config')
        data[f_name] = stats

    if not flags:
        return data

    # Filtering
    filtered_data = {}
    for f_name, stats in data.items():
        include = True
        for param, pval in flags.items():
            if param.startswith("_"):
                continue
            if (not pval and param in stats) or \
               (pval and param not in stats):
                include = False
                break
        if include:
            filtered_data[f_name] = stats

    return filtered_data


def file_list(*packages):
    '''
    List the files that belong to a package. Not specifying any packages will
    return a list of _every_ file on the system's rpm database (not generally
    recommended).

    CLI Examples:

    .. code-block:: bash

        salt '*' lowpkg.file_list httpd
        salt '*' lowpkg.file_list httpd postfix
        salt '*' lowpkg.file_list
    '''
    if not packages:
        cmd = 'rpm -qla'
    else:
        cmd = 'rpm -ql {0}'.format(' '.join(packages))
    ret = __salt__['cmd.run'](
            cmd,
            python_shell=False,
            output_loglevel='trace').splitlines()
    return {'errors': [], 'files': ret}


def file_dict(*packages):
    '''
    List the files that belong to a package, sorted by group. Not specifying
    any packages will return a list of _every_ file on the system's rpm
    database (not generally recommended).

    CLI Examples:

    .. code-block:: bash

        salt '*' lowpkg.file_dict httpd
        salt '*' lowpkg.file_dict httpd postfix
        salt '*' lowpkg.file_dict
    '''
    errors = []
    ret = {}
    pkgs = {}
    if not packages:
        cmd = 'rpm -qa --qf \'%{NAME} %{VERSION}\\n\''
    else:
        cmd = 'rpm -q --qf \'%{{NAME}} %{{VERSION}}\\n\' {0}'.format(
            ' '.join(packages)
        )
    out = __salt__['cmd.run'](cmd, python_shell=False, output_loglevel='trace')
    for line in out.splitlines():
        if 'is not installed' in line:
            errors.append(line)
            continue
        comps = line.split()
        pkgs[comps[0]] = {'version': comps[1]}
    for pkg in pkgs:
        files = []
        cmd = 'rpm -ql {0}'.format(pkg)
        out = __salt__['cmd.run'](cmd, python_shell=False, output_loglevel='trace')
        for line in out.splitlines():
            files.append(line)
        ret[pkg] = files
    return {'errors': errors, 'packages': ret}


def owner(*paths):
    '''
    Return the name of the package that owns the file. Multiple file paths can
    be passed. If a single path is passed, a string will be returned,
    and if multiple paths are passed, a dictionary of file/package name pairs
    will be returned.

    If the file is not owned by a package, or is not present on the minion,
    then an empty string will be returned for that path.

    CLI Examples:

    .. code-block:: bash

        salt '*' lowpkg.owner /usr/bin/apachectl
        salt '*' lowpkg.owner /usr/bin/apachectl /etc/httpd/conf/httpd.conf
    '''
    if not paths:
        return ''
    ret = {}
    cmd = 'rpm -qf --queryformat "%{{NAME}}" {0!r}'
    for path in paths:
        ret[path] = __salt__['cmd.run_stdout'](cmd.format(path),
                                               output_loglevel='trace')
        if 'not owned' in ret[path].lower():
            ret[path] = ''
    if len(ret) == 1:
        return list(ret.values())[0]
    return ret


@decorators.which('rpm2cpio')
@decorators.which('cpio')
@decorators.which('diff')
def diff(package, path):
    '''
    Return a formatted diff between current file and original in a package.
    NOTE: this function includes all files (configuration and not), but does
    not work on binary content.

    :param package: The name of the package
    :param path: Full path to the installed file
    :return: Difference or empty string. For binary files only a notification.

    CLI example:

    .. code-block:: bash

        salt '*' lowpkg.diff apache2 /etc/apache2/httpd.conf
    '''

    cmd = "rpm2cpio {0} " \
          "| cpio -i --quiet --to-stdout .{1} " \
          "| diff -u --label 'A {1}' --from-file=- --label 'B {1}' {1}"
    res = __salt__['cmd.shell'](cmd.format(package, path), output_loglevel='trace')
    if res and res.startswith('Binary file'):
        return 'File "{0}" is binary and its content has been modified.'.format(path)

    return res
