import sys
import xml.etree.ElementTree as ET

if len(sys.argv) < 2:
    print("ERRIR: Require at least the updateinfo.xml file name")
    sys.exit(1)

filename = sys.argv[1]
timestamp = None
if len(sys.argv) > 2:
  timestamp = sys.argv[2]

tree = ET.parse(filename)
root = tree.getroot()

package_versions = {}
package_versions_skip = []

for update in root:
  patch_id = update.find("id").text
  issued_date = int(update.find('issued').attrib['date'])
  pkglist = update.find("pkglist").find("collection")
  # updates which are newer than the time stamp should be blocked (conflict of the released version)
  # if there were more patches with it, it applies to all of them
  if not timestamp is None and issued_date > timestamp:
    continue
  for package in pkglist:
    name = package.attrib['name']
    version = package.attrib['version']
    release = package.attrib['release']

    # if there is a newer patch already known, ignore the old one
    if name in package_versions:
      if issued_date < package_versions[name]["issued"]:
        print("Older patch, skipping ", name, file=sys.stderr)
        continue
  
    package_versions[name] = {
      "version" : version,
      "release" : release,
      "issued" : issued_date
    }

# list of require statements for the .spec-file
lines = []

for package in package_versions.keys():
  requires = "Requires: ({0} = {1}-{2} if {0})".format(package, package_versions[package]["version"], package_versions[package]["release"])
  lines.append(requires)

lines = list(dict.fromkeys(lines))
lines.sort()
for line in lines:
  print(line)