#!/usr/bin/python -tt
# (c) 2012, Red Hat, Inc
# Written by Seth Vidal <skvidal at fedoraproject.org>
#
# This file is part of Ansible
#
# Ansible 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.
#
# Ansible 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 Ansible.  If not, see <http://www.gnu.org/licenses/>.
#


import os
import sys
import yum
import subprocess
import datetime
import shlex
import re
import traceback


try:
    import json
except ImportError:
    import simplejson as json
    

def yum_base(conf_file=None, cachedir=False):
    my = yum.YumBase()
    my.preconf.debuglevel=0
    if conf_file and os.path.exists(conf_file):
        my.preconf.fn = conf_file
    if cachedir:
        if hasattr(my, 'setCacheDir'):
            my.setCacheDir()
        else:
            cachedir = yum.misc.getCacheDir()
            my.repos.setCacheDir(cachedir)
            my.conf.cache = 0 
    
    return my

def pkg_to_dict(po):
    d = {
        'name':po.name,
        'arch':po.arch,
        'epoch':po.epoch,
        'release':po.release,
        'version':po.version,
        'repo':po.ui_from_repo,
        '_nevra':po.ui_nevra,
        }
    if type(po) == yum.rpmsack.RPMInstalledPackage:
        d['yumstate'] = 'installed'
    else:
        d['yumstate'] = 'available'

    return d
    
def list_stuff(my, stuff):
    # FIXME - there are poitential tracebacks that could occur here
    # need some more catching for them so we can see what happened
    if stuff == 'installed':
        return [ pkg_to_dict(po) for po in my.rpmdb ]
    elif stuff == 'updates':
        return [ pkg_to_dict(po) for 
                po in my.doPackageLists(pkgnarrow='updates').updates ]
    elif stuff == 'available':
        return [ pkg_to_dict(po) for po in my.pkgSack ]
    elif stuff == 'repos':
        r = []
        for repo in my.repos.repos.values():
            t = {}
            s = 'disabled'
            if repo.enabled:
                s = 'enabled'
            t[repo.id] = s
            r.append(t)
        
        return r
    else:
        e,m,u = my.rpmdb.matchPackageNames([stuff])
        p = e + m
        e,m,u = my.pkgSack.matchPackageNames([stuff])
        p = p + e + m
        return [ pkg_to_dict(po) for po in p ]

def run_yum(command):
    try:
        cmd = subprocess.Popen(command, shell=True, 
            stdout=subprocess.PIPE, stderr=subprocess.PIPE)
        out, err = cmd.communicate()
    except (OSError, IOError), e:
        rc = 1
        err = str(e)
        out = ''
    except:
        rc = 1
        err = traceback.format_exc()
        out = ''

        if out is None:
           out = ''
        if err is None:
           err = ''
    else:
        rc = cmd.returncode
        
    return rc, out, err

def ensure(my, state, pkgspec):
    yumconf = my.conf.config_file_path
    res = {}
    if state == 'installed':
        # check if pkgspec is installed
        if re.search('[></=]',pkgspec):
            try:
                pkgs = my.returnInstalledPackagesByDep(pkgspec)
            except yum.Errors.YumBaseError:
                pkgs = None
        else:
            e,m,u = my.rpmdb.matchPackageNames([pkgspec])
            pkgs = e +m
        
        if pkgs:
            return { 'changed':False }
    
        # if not see if it is available
        if re.search('[></=]',pkgspec):
            try:
                pkgs = my.returnPackagesByDep(pkgspec)
            except yum.Errors.YumBaseError:
                pkgs = None
        else:
            e,m,u = my.pkgSack.matchPackageNames([pkgspec])
            pkgs = e +m
        
        if not pkgs:
            msg = "No Package matching %s available" % pkgspec
            return { 'changed':False, 'failed': True, 'msg':msg }
        
        my.close()
        del my
        cmd = "yum -c %s -d1 -y install '%s'" % (yumconf, pkgspec)
        rc, out, err = run_yum(cmd)
        # FIXME - if we did an install - go and check the rpmdb to see if it actually installed
        # look for the pkg in rpmdb
        # look for the pkg via obsoletes
        if rc:
            changed = False
            failed = True
        else:
            changed = True
            failed = False
        
        res['changed'] = changed

        if failed:
            res['failed'] = failed
            res['msg'] = err
            res['results'] = out
        
        return res
        
    if state == 'removed':
        # check if pkgspec is installed
        # if not return {changed: False, failed=False }
        # if so try to remove it:
        # if successfull {changed:True, failed=False, results=stdout, errors=stderr }
        # if fail {'changed':False, failed='True', results=stdout, errors=stderr }
        yumconf = my.conf.config_file_path
        if re.search('[></=]',pkgspec):
            try:
                pkgs = my.returnInstalledPackagesByDep(pkgspec)
            except yum.Errors.YumBaseError:
                pkgs = None
        else:
            e,m,u = my.rpmdb.matchPackageNames([pkgspec])
            pkgs = e +m

        if not pkgs:
            return { 'changed':False }
    
        my.close()
        del my
        cmd = "yum -c %s -d1 -y remove '%s'" % (yumconf, pkgspec)
        rc, out, err = run_yum(cmd)
        # FIXME if we ran the remove - check to make sure it actually removed :(
        # look for the pkg in the rpmdb
        if rc:
            changed = False
            failed = True
        else:
            changed = True
            failed = False

        res['changed'] = changed

        if failed:
            res['failed'] = failed
            res['msg'] = err
            res['results'] = out

        return res
                
    if state == 'latest':
        updates = my.doPackageLists(pkgnarrow='updates', patterns=[pkgspec]).updates
        avail =  my.doPackageLists(pkgnarrow='available', patterns=[pkgspec]).available
        if not updates and not avail:
            if not my.doPackageLists(pkgnarrow='installed', patterns=[pkgspec]).installed:
                msg = "No Package matching '%s' found available, installed or updated" % pkgspec
                return { 'changed':False, 'failed':True, 'msg': msg }
            return { 'changed':False,}

        # we have something in updates or available
        if not updates:
            cmd = "yum -c %s -d1 -y install '%s'" % (yumconf, pkgspec)
        else:
            cmd = "yum -c %s -d1 -y update '%s'" % (yumconf, pkgspec)
        rc, out, err = run_yum(cmd)

        # FIXME if it is - update it and check to see if it applied
        # check to see if there is no longer an update available for the pkgspec
        if rc:
            changed = False
            failed = True
        else:
            changed = True
            failed = False


        res['changed'] = changed

        if failed:
            res['failed'] = failed
            res['msg'] = err
            res['results'] = out

        return res
        
    return {'changed': False,
            'failed': True,
            'results':'',
            'errors': 'Ensure state %r unknown' % state }


def update(args):
    #generic update routine 
    pass

def remove_only(pkgspec):
    # remove this pkg and only this pkg - fail if it will require more to remove
    pass

def main():
    # state=installed pkg=pkgspec
    # state=removed pkg=pkgspec
    # state=latest pkg=pkgspec
    #
    # informational commands:
    #   list=installed
    #   list=updates
    #   list=available
    #   list=repos
    #   list=pkgspec
    
    if len(sys.argv) == 1:
        msg = "the yum module requires arguments (-a)"
        return 1, msg

    argfile = sys.argv[1]
    if not os.path.exists(argfile):
        msg = "Argument file not found"
        return 1, msg

    args = open(argfile, 'r').read()
    items = shlex.split(args)

    if not len(items):
        msg = "the yum module requires arguments (-a)"
        return 1, msg

    # if nothing else changes - it fails
    results = { 'changed':False, 
                'failed':True, 
                'results':'', 
                'errors':'', 
                'msg':args }
    params = {}
    for x in items:
        try:
            (k, v) = x.split("=", 1)
        except ValueError:
            msg = "invalid arguments: %s" % args
            return 1, msg
            
        params[k] = v

    if 'conf_file' not in params:
        params['conf_file'] = None

    
    if 'list' in params:
        try:
            my = yum_base(conf_file=params['conf_file'], cachedir=True)
            results = dict(results=list_stuff(my, params['list']))
        except Exception, e:
            return 1, str(e)
            
    elif 'state' in params:
        if 'pkg' not in params:
            results['msg'] = "No pkg specified"
        else:
            try:
                my = yum_base(conf_file=params['conf_file'], cachedir=True)        
                state = params['state']
                pkgspec = params['pkg']
                results = ensure(my, state, pkgspec)
            except Exception, e:
                return 1, str(e)

    else:
        print json.dumps(dict(failed=True, msg='invalid module parameters'))
        sys.exit(1)

    print json.dumps(results)
    return 0, None

if __name__ == "__main__":
    rc, msg = main()
    if rc != 0: # something went wrong emit the msg
        print json.dumps({
            "failed" : rc,
            "msg" : msg
        })   
        sys.exit(rc)