# This file is part of cloud-init. See LICENSE file for license information.

"""Commandline utility to list the canonical cloud-id for an instance."""

import argparse
import json
import sys

from cloudinit.sources import (
    INSTANCE_JSON_FILE,
    METADATA_UNKNOWN,
    canonical_cloud_id,
)
from cloudinit.util import error

DEFAULT_INSTANCE_JSON = "/run/cloud-init/%s" % INSTANCE_JSON_FILE

NAME = "cloud-id"


def get_parser(parser=None):
    """Build or extend an arg parser for the cloud-id utility.

    @param parser: Optional existing ArgumentParser instance representing the
        query subcommand which will be extended to support the args of
        this utility.

    @returns: ArgumentParser with proper argument configuration.
    """
    if not parser:
        parser = argparse.ArgumentParser(
            prog=NAME,
            description="Report the canonical cloud-id for this instance",
        )
    parser.add_argument(
        "-j",
        "--json",
        action="store_true",
        default=False,
        help="Report all standardized cloud-id information as json.",
    )
    parser.add_argument(
        "-l",
        "--long",
        action="store_true",
        default=False,
        help="Report extended cloud-id information as tab-delimited string.",
    )
    parser.add_argument(
        "-i",
        "--instance-data",
        type=str,
        default=DEFAULT_INSTANCE_JSON,
        help="Path to instance-data.json file. Default is %s"
        % DEFAULT_INSTANCE_JSON,
    )
    return parser


def handle_args(name, args):
    """Handle calls to 'cloud-id' cli.

    Print the canonical cloud-id on which the instance is running.

    @return: 0 on success, 1 otherwise.
    """
    try:
        instance_data = json.load(open(args.instance_data))
    except IOError:
        return error(
            "File not found '%s'. Provide a path to instance data json file"
            " using --instance-data" % args.instance_data
        )
    except ValueError as e:
        return error(
            "File '%s' is not valid json. %s" % (args.instance_data, e)
        )
    v1 = instance_data.get("v1", {})
    cloud_id = canonical_cloud_id(
        v1.get("cloud_name", METADATA_UNKNOWN),
        v1.get("region", METADATA_UNKNOWN),
        v1.get("platform", METADATA_UNKNOWN),
    )
    if args.json:
        v1["cloud_id"] = cloud_id
        response = json.dumps(  # Pretty, sorted json
            v1, indent=1, sort_keys=True, separators=(",", ": ")
        )
    elif args.long:
        response = "%s\t%s" % (cloud_id, v1.get("region", METADATA_UNKNOWN))
    else:
        response = cloud_id
    sys.stdout.write("%s\n" % response)
    return 0


def main():
    """Tool to query specific instance-data values."""
    parser = get_parser()
    sys.exit(handle_args(NAME, parser.parse_args()))


if __name__ == "__main__":
    main()

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