#!/usr/bin/python
# Copyright (c) 2014 SUSE Linux Products GmbH
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.


from pprint import pprint
import os, sys, re
import logging
from optparse import OptionParser
import rpm
import pickle
import cmdln

try:
    from xml.etree import cElementTree as ET
except ImportError:
    import cElementTree as ET

class ChangeLogger(cmdln.Cmdln):
    def __init__(self, *args, **kwargs):
        cmdln.Cmdln.__init__(self, args, kwargs)
        self.ts = rpm.TransactionSet()
        self.ts.setVSFlags(rpm._RPMVSF_NOSIGNATURES)

    def readRpmHeader(self, filename):
        """ Read an rpm header. """
        fd = os.open(filename, os.O_RDONLY)
        h = None
        try:
            h = self.ts.hdrFromFdno(fd)
        except rpm.error, e:
            if str(e) == "public key not available":
                print str(e)
            if str(e) == "public key not trusted":
                print str(e)
            if str(e) == "error reading package header":
                print str(e)
            h = None
        finally:
            os.close(fd)
        return h

    def readChangeLogs(self, args):

        pkgdata = dict()

        for path in args:
            for root, dirs, files in os.walk(path):
                for pkg in [ os.path.join(root, file) for file in files]:
                    h = self.readRpmHeader( pkg )
                    #print h.sprintf("[* %{CHANGELOGTIME:day} %{CHANGELOGNAME}\n%{CHANGELOGTEXT}\n\n]")
                    #print h['changelogname']
                    evr = dict()
                    for tag in ['name', 'version', 'release']:
                        evr[tag] = h[tag]
                    if h['sourcerpm'] in pkgdata:
                        pkgdata[h['sourcerpm']]['packages'].append(evr)
                    else:
                        data = { 'packages': [ evr ] }
                        for tag in ['changelogtime', 'changelogtext']:
                            data[tag] = h[tag]
                        pkgdata[h['sourcerpm']] = data
        return pkgdata

    @cmdln.option("--snapshot", action="store", type='string', help="snapshot number")
    @cmdln.option("--dir", action="store", type='string', dest='dir', help="data directory")
    def do_save(self, subcmd, opts, *dirs):
        """${cmd_name}: save changelog information for snapshot

        ${cmd_usage}
        ${cmd_option_list}
        """

        if not opts.dir:
            raise Exception("need --dir option")
        if not os.path.isdir(opts.dir):
            raise Exception("%s must be a directory"%opts.dir)
        if not opts.snapshot:
            raise Exception("missing snapshot option")

        f = open(os.path.join(opts.dir, opts.snapshot), 'wb')
        pickle.dump([1, self.readChangeLogs(dirs)], f)

    def do_dump(self, subcmd, opts, *dirs):
        """${cmd_name}: pprint the package changelog information

        ${cmd_usage}
        ${cmd_option_list}
        """
        pprint(self.readChangeLogs(dirs))

    def get_optparser(self):
        parser = cmdln.CmdlnOptionParser(self)
        parser.add_option("--dry", action="store_true", help="dry run")
        parser.add_option("--debug", action="store_true", help="debug output")
        parser.add_option("--verbose", action="store_true", help="verbose")
        return parser

    def postoptparse(self):
        logging.basicConfig()
        self.logger = logging.getLogger("factory-package-news")
        if (self.options.debug):
            self.logger.setLevel(logging.DEBUG)
        elif (self.options.verbose):
            self.logger.setLevel(logging.INFO)

if __name__ == "__main__":
    app = ChangeLogger()
    sys.exit( app.main() )

# vim: sw=4 et