import argparse
import os
from typing import Any

from typing_extensions import override

"""
Example usage for testing purposes. For testing data see the mattermost_fixtures
in zerver/tests/.

    ./manage.py convert_mattermost_data mattermost_fixtures --output mm_export
    ./manage.py import --destroy-rebuild-database mattermost mm_export/gryffindor

Test out the realm:
    ./tools/run-dev
    go to browser and use your dev url
"""

from django.core.management.base import CommandError, CommandParser

from zerver.data_import.mattermost import do_convert_data
from zerver.lib.management import ZulipBaseCommand


class Command(ZulipBaseCommand):
    help = """Convert the mattermost data into Zulip data format."""

    @override
    def add_arguments(self, parser: CommandParser) -> None:
        dir_help = (
            "Directory containing exported JSON file and exported_emoji (optional) directory."
        )
        parser.add_argument(
            "mattermost_data_dir", metavar="<mattermost data directory>", help=dir_help
        )

        parser.add_argument(
            "--output", dest="output_dir", help="Directory to write converted data to."
        )

        parser.add_argument(
            "--mask",
            dest="masking_content",
            action="store_true",
            help="Mask the content for privacy during QA.",
        )

        parser.formatter_class = argparse.RawTextHelpFormatter

    @override
    def handle(self, *args: Any, **options: Any) -> None:
        output_dir = options["output_dir"]
        if output_dir is None:
            raise CommandError("You need to specify --output <output directory>")

        if os.path.exists(output_dir) and not os.path.isdir(output_dir):
            raise CommandError(output_dir + " is not a directory")

        os.makedirs(output_dir, exist_ok=True)

        if os.listdir(output_dir):
            raise CommandError("Output directory should be empty!")
        output_dir = os.path.realpath(output_dir)

        data_dir = options["mattermost_data_dir"]
        if not os.path.exists(data_dir):
            raise CommandError(f"Directory not found: '{data_dir}'")
        data_dir = os.path.realpath(data_dir)

        print("Converting data ...")
        do_convert_data(
            mattermost_data_dir=data_dir,
            output_dir=output_dir,
            masking_content=options.get("masking_content", False),
        )