#!/usr/bin/python -t

# 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 Library 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

import os
import sys

import yum
import yum.Errors
from yum.misc import getCacheDir
from optparse import OptionParser
from rpmUtils.miscutils import compareEVR

def parseArgs():
    usage = "usage: %s [-c <config file>] [-a <arch>] [-r <repoid>] [-r <repoid2>]" % sys.argv[0]
    parser = OptionParser(usage=usage)
    parser.add_option("-c", "--config", default='/etc/yum.conf',
        help='config file to use (defaults to /etc/yum.conf)')
    parser.add_option("-t", "--tempcache", default=False, action="store_true", 
        help="Use a temp dir for storing/accessing yum-cache")
    parser.add_option("-d", "--cachedir", default='', 
        help="specify a custom directory for storing/accessing yum-cache")
    parser.add_option("-q", "--quiet", default=0, action="store_true", 
                      help="quiet (no output to stderr)")
    (opts, args) = parser.parse_args()
    return (opts, args)

class MySolver(yum.YumBase):
    def __init__(self, arch = None, config = "/etc/yum.conf"):
        yum.YumBase.__init__(self)

        self.arch = arch
        self.doConfigSetup(fn = config)
        if hasattr(self.repos, 'sqlite'):
            self.repos.sqlite = False
            self.repos._selectSackType()
    
    def readMetadata(self):
        self.doRepoSetup()
        self.doSackSetup(("src", ))
        for repo in self.repos.listEnabled():
            self.repos.populateSack(which=[repo.id], with='filelists')
    
    def log(self, value, msg):
        pass

def evrstr(evr):
    return evr and "%s:%s-%s" % evr or "(missing)"

def main():
    (opts, cruft) = parseArgs()

    dists = ('3', '4', '5', '6')

    solvers = {}

    for dist in dists:
        solver = MySolver(config = opts.config)
        for repo in solver.repos.repos.values():
            if repo.id not in ("extras-%s-source" % dist, ):
                repo.disable()
            else:
                repo.enable()
        solvers[dist] = solver

    if os.geteuid() != 0 or opts.tempcache or opts.cachedir != '':
        if opts.cachedir != '':
            cachedir = opts.cachedir
        else:
            cachedir = getCacheDir()
            if cachedir is None:
                print "Error: Could not make cachedir, exiting"
                sys.exit(50)

        for repo in solvers.values():
            repo.repos.setCacheDir(cachedir)

    if not opts.quiet:
        print 'Reading in repository metadata - please wait....'

    try:
        for repo in solvers.values():
            repo.readMetadata()
    except yum.Errors.RepoError, e:
        print 'Filelists not available for repo: %s' % repo
        print 'Some dependencies may not be complete for this repository'
        print 'Run as root to get all dependencies or use -t to enable a user temp cache'

    pkgdict = {'3':{},
               '4':{},
               '5':{},
               '6':{},
               }

    allnames = []
    for dist in dists:
        for l in solvers[dist].pkgSack.returnNewestByName():
            for pkg in l:
                allnames.append(pkg.name)
                pkgdict[dist][pkg.name] = (pkg.epoch, pkg.version, pkg.release)
    allnames = sorted(set(allnames))

    for name in allnames:
        evrs = map(lambda x: pkgdict[x].get(name), dists)
        last = None                         # last seen EVR
        bork = None                         # index of first repo w/ problem
        ix = 0
        for evr in evrs:
            if not evr:                     # missing
                pass                        # TODO: detect holes in continuum
            elif last is None:              # first one seen
                last = evr
            elif compareEVR(last, evr) > 0: # versioning problem
                bork = ix - 1
                break
            ix = ix + 1
        if bork is not None:
            ix = bork
            print name + ":"
            for evr in evrs[ix:]:           # onwards from the problem spot
                print "  %s: %s" % (dists[ix], evrstr(evr))
                ix = ix + 1
            print
            
if __name__ == "__main__":
    main()