# Copyright (C) 2007 - 2010 by Intevation GmbH
# Authors:
# Bernhard Herzog <bh@intevation.de>
# Bjoern Ricks <bjoern.ricks@intevation.de>
#
# This program is free software under the GPL (>=v2)
# Read the file COPYING coming with the software for details.

"""Base classes for kde maemo tag packagers"""

import re
import time
import logging

import treepkg.packager
import treepkg.subversion as subversion
import treepkg.sbuilder


class SourcePackager(treepkg.packager.SourcePackager):

    def __init__(self, *args, **kw):
        super(SourcePackager, self).__init__(*args, **kw)
        self.enterprise_version = (self.parent.pkg_date + "."
                                   + str(self.revision))
        self.maemo_version =  "%s.%s" % (self.revision,
                              self.parent.pkg_date)

    def determine_package_version(self, directory):
        enterprise_version = self.enterprise_version
        maemo_version = self.maemo_version
        revision = self.revision
        rules_revision = self.parent.rules_revision
        pkg_revision = self.parent.pkg_revision
        pkg_date = self.parent.pkg_date
    
        return self.track.version_template % locals()

    def prepare_sources_for_tarball(self, pkgbasedir, pkgbaseversion):
        self.update_version_numbers(pkgbasedir)

    def update_version_numbers(self, pkgbasedir):
        """Updates the version numbers in the code in pkgbasedir.
        The default implementation does nothing.  Derived classes should
        override this method if necessary.
        """

    def get_change_msg(self):
        return self.changemsg_template % dict(revision=self.revision,
                                     pkg_date=self.parent.pkg_date,
                                     rules_revision=self.parent.rules_revision)


class RevisionPackager(treepkg.packager.RevisionPackager):

    source_packager_cls = SourcePackager

    def __init__(self, *args, **kw):
        self.pkg_date = kw.pop("pkg_date",
                               time.strftime("%Y%m%d", time.localtime()))
        super(RevisionPackager, self).__init__(*args, **kw)


class PackageTrack(treepkg.packager.PackageTrack):

    revision_packager_cls = RevisionPackager
    builder_cls = treepkg.sbuilder.SbdmockBuilder

    extra_config_desc = [("tags_url", str, ""),
                         ("tags_pattern", str, ""),
                         ("tags_subdir", str, ""),
                         ("tags_rules_subdir", str, "")]

    def __init__(self, *args, **kw):
        tags_url = kw.pop("tags_url")
        tags_pattern = kw.pop("tags_pattern")
        tags_subdir = kw.pop("tags_subdir")
        tags_rules_subdir = kw.pop("tags_rules_subdir")
        super(PackageTrack, self).__init__(*args, **kw)
        self.tag_detector = subversion.TagDetector(tags_url, tags_pattern,
                                                   tags_subdir)
        self.tag_rules_detector = subversion.TagDetector(tags_url, tags_pattern,
                                                   tags_rules_subdir)
        self.use_tag_rules = False
        if tags_rules_subdir:
            self.use_tag_rules = True

    def packager_for_new_revision(self):
        logging.info("Checking tags")
        self.tag_url = None
        tag_url, tag_revision = self.tag_detector.newest_tag_revision()
        tag_rules_url, tag_rules_revision = self.tag_rules_detector.newest_tag_revision()
        logging.info("Found: %s: %s", tag_url, tag_revision)
        if self.use_tag_rules and tag_rules_url is None:
            self.use_tag_rules = False
        if tag_url is not None:
            if not self.use_tag_rules:
                tag_rules_revision = self.rules_working_copy.last_changed_revision()
            revision = (tag_revision, tag_rules_revision)
            logging.info("New revision is %s", revision)
            if revision not in self.get_revision_numbers():
                logging.info("Revision %s has not been packaged yet",
                             revision)
                self.tag_url = tag_url
                self.tag_revision = tag_revision
                self.tag_rules_url = tag_rules_url
                self.tag_rules_revision = tag_rules_revision
                tag_date, tag_change_count = self.tag_pkg_parameters(tag_url)
                pkg_revision = (self.pkg_revision_template
                                % dict(pkg_revision=tag_change_count,
                                        rules_revision=revision[1]))
                return self.revision_packager_cls(self, tag=tag_url,
                                                  pkg_revision=pkg_revision,
                                                  pkg_date=tag_date,
                                                  *revision)
            else:
                logging.info("Revision %s has already been packaged.",
                             revision)
        else:
            return super(PackageTrack, self).packager_for_new_revision()

    def export_sources(self, to_dir):
        if self.tag_url is not None:
            logging.info("Exporting sources for tarball from %r to %r",
                         self.tag_url, to_dir)
            self.working_copy.export_tag(self.tag_url, to_dir,
                                         revision=self.tag_revision)
        else:
            super(PackageTrack, self).export_sources(to_dir)

    def copy_debian_directory(self, to_dir):
        if self.use_tag_rules:
            logging.info("Exporting debian package description from %s to %s",
                    self.tag_rules_url, to_dir)
            self.rules_working_copy.export_tag(self.tag_rules_url, to_dir)
        else:
            super(PackageTrack, self).copy_debian_directory(to_dir)

    def tag_pkg_parameters(self, tag_url):
        match = re.search(r"/enterprise[^.]*\.[^.]*\."
                          r"(?P<date>[0-9]{8})\.(?P<baserev>[0-9]+)/",
                          tag_url)
        if match:
            date = match.group("date")
            baserev = match.group("baserev")
            xml_log = subversion.log_xml(tag_url, baserev)
            revisions = subversion.extract_tag_revisions(xml_log)
            tag_change_count = len(revisions)
            return (date, tag_change_count)
        else:
            raise RuntimeError("Cannot determine tag parameters from %r"
                               % tag_url)