from typing import Any

import ijson
from django.core.management.base import BaseCommand, CommandParser


class Command(BaseCommand):
    help = """
    Compare rendered messages from files.
    Usage: ./manage.py compare_messages <dump1> <dump2>
    """

    def add_arguments(self, parser: CommandParser) -> None:
        parser.add_argument("dump1", help="First file to compare")
        parser.add_argument("dump2", help="Second file to compare")

    def handle(self, *args: Any, **options: Any) -> None:
        total_count = 0
        changed_count = 0
        with open(options["dump1"]) as dump1, open(options["dump2"]) as dump2:
            for m1, m2 in zip(ijson.items(dump1, "item"), ijson.items(dump2, "item")):
                total_count += 1
                if m1["id"] != m2["id"]:
                    self.stderr.write("Inconsistent messages dump")
                    break
                if m1["content"] != m2["content"]:
                    changed_count += 1
                    self.stdout.write("Changed message id: {id}".format(id=m1["id"]))
        self.stdout.write(f"Total messages: {total_count}")
        self.stdout.write(f"Changed messages: {changed_count}")