"""
`leave`: give up a membership. Asked first; `--yes` answers for a script.

The hub's half only, as in the application: the account stops being a member,
so its nodes can no longer be reached. The node keeps what it holds — the
identity it pinned, its copy of the keys, the files uploaded — until its
operator unpins them, and the group key already served opens what it opened
until the operator rotates it. The owner cannot leave a group.
"""

import json

from ..client.groups import my_groups
from ..client.hub import HubError
from ..client.paths import group_arg, handle, resolve_group
from ..errors import REFUSED, CliError
from ..output import confirm, safe, sentence
from .context import Context

HELP = "leave a group"


def add_parser(sub, parent) -> None:
    p = sub.add_parser("leave", parents=[parent], help=HELP, description=sentence(HELP)
                       + ". Its files and its chat are no longer reachable from this "
                       "account; only a new invitation brings it back. The owner cannot "
                       "leave a group.")
    p.add_argument("group", metavar="GROUP", help="the group, as `groups` lists it")
    p.add_argument("-y", "--yes", action="store_true", help="do not ask for confirmation")


async def run(ctx: Context) -> int:
    await ctx.hub.check_version()
    account = ctx.account()
    try:
        group = resolve_group(await my_groups(account), group_arg(ctx.args.group))
        name = handle(group)
        if group.get("is_admin"):
            raise CliError(REFUSED, f"You own {safe(name)}, so you cannot leave it: it "
                                    "would be left with nobody able to manage it.")
        confirm(f"Leave {safe(name)}? Its files and chat will no longer be reachable "
                "from your account.", ctx.args.yes)
        try:
            await account.call(account.hub.leave_group, group["id"])
        except HubError as e:
            if e.status == 409:
                raise CliError(REFUSED, e.detail) from e
            raise
    finally:
        await account.close()
    if ctx.args.json:
        print(json.dumps({"left": True, "path": name, "id": group["id"]}))
    else:
        print(f"Left {safe(name)}.")
    return 0