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"""
`groups`: the groups this account belongs to, one line each.

The hub answers alone (`/v1/groups/mine`); no node is dialled. Whether a node
is up is what the hub sees of its socket, not a promise this machine can reach
it. "owner" is the account that created the group on the hub — a node's
operator is another notion.
"""

import contextlib
import json
import sys
from datetime import UTC, datetime

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

HELP = "list the groups you belong to"


def add_parser(sub, parent) -> None:
    sub.add_parser("groups", parents=[parent], help=HELP, description=sentence(HELP)
                   + ": the node's state, your role, the visibility, the last activity. "
                   "The GROUP column is the path `ls`, `get` and `put` take.")


def node_state(g: dict) -> str:
    if not g.get("hosted", True):
        return "none"
    return "up" if g.get("node_online") else "down"


def local_time(iso: str | None) -> str:
    if not iso:
        return ""
    try:
        moment = datetime.fromisoformat(iso)
    except ValueError:
        return ""
    if moment.tzinfo is None:           # a hub on SQLite sends UTC without saying so
        moment = moment.replace(tzinfo=UTC)
    return moment.astimezone().strftime("%Y-%m-%d %H:%M")


async def run(ctx: Context) -> int:
    await ctx.hub.check_version()
    account = ctx.account()
    try:
        groups = await my_groups(account)
        waiting = 0
        if not ctx.args.json and not ctx.args.quiet:
            # A hub without invitations answers nothing useful; the list stands.
            with contextlib.suppress(HubError, CliError):
                waiting = len(await account.call(account.hub.invitations))
    finally:
        await account.close()
    groups.sort(key=lambda g: (g["name"].lower(), g.get("owner_username") or ""))
    if ctx.args.json:
        json.dump([{"group": g["name"], "owner": g.get("owner_username"), "id": g["id"],
                    "path": handle(g), "node": node_state(g),
                    "role": "owner" if g.get("is_admin") else "member",
                    "visibility": g.get("visibility"), "join_policy": g.get("join_policy"),
                    "muted": bool(g.get("muted")), "description": g.get("description", ""),
                    "last_activity_at": g.get("last_activity_at")}
                   for g in groups], sys.stdout, indent=1)
        print()
        return 0
    if waiting:
        print(f"{waiting} invitation{'s' if waiting != 1 else ''} waiting for your answer: "
              "meshbay-cli invitations", file=sys.stderr)
    if not groups:
        print("You belong to no group yet.", file=sys.stderr)
        return 0
    print(f"{'NODE':<6}{'ROLE':<8}{'VISIBILITY':<12}{'LAST ACTIVITY':<18}GROUP")
    for g in groups:
        role = "owner" if g.get("is_admin") else "member"
        print(f"{node_state(g):<6}{role:<8}{safe(g.get('visibility') or ''):<12}"
              f"{local_time(g.get('last_activity_at')):<18}{safe(handle(g))}")
    return 0