"""Unit tests for app.cli.

Sub-command parsing only — the DB-touching paths (`grant_credit`,
`revoke_credit`, `show_status`) are exercised manually inside the dev
container. The parser-level tests are enough to catch the common
shapes: bad args, missing args, unknown sub-command."""
from __future__ import annotations

import pytest

from app.cli import build_parser


def test_grant_credit_parses():
    args = build_parser().parse_args(["grant-credit", "user@example.com", "3"])
    assert args.cmd == "grant-credit"
    assert args.email == "user@example.com"
    assert args.months == 3.0


def test_grant_credit_accepts_fractional_months():
    args = build_parser().parse_args(["grant-credit", "user@x.com", "0.5"])
    assert args.months == 0.5


def test_revoke_credit_parses():
    args = build_parser().parse_args(["revoke-credit", "user@example.com"])
    assert args.cmd == "revoke-credit"
    assert args.email == "user@example.com"


def test_show_status_parses():
    args = build_parser().parse_args(["show-status", "user@example.com"])
    assert args.cmd == "show-status"


def test_grant_credit_requires_months():
    with pytest.raises(SystemExit):
        build_parser().parse_args(["grant-credit", "user@example.com"])


def test_unknown_command_rejected():
    with pytest.raises(SystemExit):
        build_parser().parse_args(["bogus-cmd"])


def test_no_command_rejected():
    with pytest.raises(SystemExit):
        build_parser().parse_args([])