from django.core.management.base import BaseCommand
import json
import peeringdb_server.models as pdbm
from django.contrib.contenttypes.models import ContentType
from reversion.models import Version

MODELS = [
    pdbm.Organization, pdbm.Network, pdbm.InternetExchange,
    pdbm.InternetExchangeFacility, pdbm.Facility, pdbm.NetworkContact,
    pdbm.NetworkFacility, pdbm.IXLan, pdbm.IXLanPrefix, pdbm.NetworkIXLan
]


class Command(BaseCommand):
    args = "<reftag> <id, id, ...>"
    help = "Inspect an object's reversion history"

    def log(self, id, msg):
        print "%s: %s" % (id, msg)

    def print_line(self):
        print "".join(["-" for i in range(0, 80)])

    def add_arguments(self, parser):
        parser.add_argument("reftag", nargs="?", type=str)
        parser.add_argument("id", nargs="+", type=int)

    def handle(self, *args, **options):

        versions = Version.objects.all()
        ref_tag = options.get("reftag")

        ids = [int(i) for i in options.get("id")]

        print(ref_tag, ids)

        model = None
        for m in MODELS:
            if m.handleref.tag == ref_tag:
                model = m
                break

        if not model:
            print "Unknown ref tag: %s" % ref_tag
            return

        content_type = ContentType.objects.get_for_model(model)
        for id in ids:
            versions = Version.objects.filter(
                content_type=content_type,
                object_id=id).order_by('revision_id')
            print "%s - %d:" % (ref_tag, id)
            self.print_line()
            prev = {}
            n = 0
            for version in versions:
                data = json.loads(version.serialized_data)[0].get("fields")
                n += 1
                print "VERSION: %d (%d) - %s - User: %s" % (
                    n, version.id, data.get("updated"), version.revision.user)
                if not prev:
                    for k, v in data.items():
                        print "%s: '%s'" % (k, v)
                    self.print_line()
                    prev = data
                    continue
                for k, v in data.items():
                    if prev.get(k) != v:
                        print "%s: '%s' => '%s'" % (k, prev.get(k), v)

                prev = data
                self.print_line()