"""
Every CLI verb reaches its own code without falling over on a name.

`meshbay-node reload` shipped with `subprocess` unimported and crashed with a
NameError the first time it was typed. Python compiles that file happily —
`node --check validates syntax, not names` is already in CLAUDE.md about the
SPA, and it is the same class here: nothing in the module is wrong until the
branch runs.

So this walks every documented verb with the daemon stubbed out, and asserts
that the branch executes. It is deliberately shallow — what each command *does*
is tested in `test_ops.py` and `test_roster_pairing.py`. What this catches is a
branch nobody ever ran.
"""

import sys
from pathlib import Path

import pytest

from meshbay_node import daemon as daemon_mod

# Each verb, with the arguments that reach its branch. `--yes` where the command
# would otherwise stop for a confirmation nobody can type in a test.
VERBS = [
    ["status"],
    ["group", "list"],
    ["group", "add"],                      # missing --dir: usage, then exit
    ["gek", "init"],
    ["gek", "rotate", "--yes"],
    ["gek-init"],
    ["member", "list"],
    ["member", "invite", "bob"],
    ["member", "revoke", "bob"],
    ["member", "unpin", "bob"],
    ["operator", "pair"],
    ["file", "list"],
    ["file", "rm", "abc", "--yes"],
    ["video", "rematch", "--yes"],
    ["denylist", "show"],
    ["denylist", "clear", "--yes"],
    ["stun", "list"],
    ["reload"],
    ["restart-daemon"],
]


@pytest.fixture
def stub_daemon(monkeypatch, tmp_path):
    """
    Answer every loopback call with an empty-ish payload.

    The point is to reach the branch, not to exercise the daemon: a command that
    only crashes when the node is running is still a command that crashes.
    """
    calls: list[tuple] = []

    def fake_api(cfg, path, method="GET", timeout=30, body=None):
        calls.append((method, path))
        return {
            "groups": [], "files": [], "identities": [], "members": [],
            "invites": [], "users": [], "jtis": [], "count": 0, "removed": 0,
            "subject": "all", "code": "TEST-CODE", "expires_at": "",
            "user_id": "u", "authorized_members": 0, "errors": [],
            "name": "g", "group_id": "g", "shared_dir": str(tmp_path),
            "config": str(tmp_path / "node.toml"),
        }

    monkeypatch.setattr(daemon_mod, "_daemon_api", fake_api)
    monkeypatch.setattr(daemon_mod, "_resolve_group", lambda cfg, g: "g" * 32)

    conf = tmp_path / "node.toml"
    conf.write_text('[hub]\nurl = "https://example.invalid"\n')
    monkeypatch.setattr(daemon_mod, "DEFAULT_CONFIG_PATH", conf)

    # No interactive prompt left to hang on.
    monkeypatch.setattr("builtins.input", lambda *a: "n")
    import getpass
    monkeypatch.setattr(getpass, "getpass", lambda *a, **kw: "test-password")

    # `reload` and `restart-daemon` shell out to `systemctl --user`. Without
    # this the test would run that against whatever session bus is actually
    # available — a test must not reach outside itself, which is exactly what
    # the pgrep/os.kill version of this fixture existed to prevent before
    # those commands were rewritten to delegate to systemd.
    import subprocess

    systemctl_calls: list[list[str]] = []

    def fake_run(argv, **kw):
        systemctl_calls.append(argv)
        return subprocess.CompletedProcess(argv, 0, stdout="", stderr="")

    monkeypatch.setattr(subprocess, "run", fake_run)
    calls.append(("_systemctl_calls", systemctl_calls))
    return calls


@pytest.mark.parametrize("argv", VERBS, ids=lambda a: "-".join(a))
def test_every_verb_reaches_its_branch(argv, stub_daemon, monkeypatch, capsys):
    monkeypatch.setattr(sys, "argv", ["meshbay-node", *argv])
    try:
        daemon_mod.main()
    except SystemExit:
        # A usage message and exit(1) is a branch that ran, which is what this
        # asserts. A NameError or AttributeError is not.
        pass
    except (NameError, AttributeError) as e:            # pragma: no cover
        pytest.fail(f"{' '.join(argv)} crashed on a name: {e}")

    out = capsys.readouterr()
    assert out.out or out.err, f"{' '.join(argv)} printed nothing at all"


def test_the_verb_list_here_matches_the_parser():
    """
    A verb added to the parser and not to this file would go untested, which is
    exactly how `reload` shipped broken.
    """
    import argparse
    import inspect

    source = inspect.getsource(daemon_mod.main)
    start = source.index('choices=[') + len('choices=[')
    end = source.index(']', start)
    declared = {c.strip().strip('"\'') for c in source[start:end].split(',')
                if c.strip()}

    exercised = {argv[0] for argv in VERBS}
    # `init` writes a config file and `calibrate-argon2` burns CPU for seconds;
    # both are excluded on purpose rather than by omission.
    untested = declared - exercised - {"init", "reset", "calibrate-argon2"}
    assert not untested, (
        f"CLI verbs with no dispatch test: {sorted(untested)} — add them to "
        f"VERBS above")

    # The server-rendered admin UI (and its `ui` verb) were removed in
    # docs/refactor-node-ui.md phase 5. The control API stays; the browser
    # page does not.
    assert "ui" not in declared, "the `ui` verb came back"


@pytest.mark.parametrize("argv,verb", [
    (["reload"], "reload"),
    (["restart-daemon"], "restart"),
])
def test_lifecycle_commands_delegate_to_systemctl_user(
        argv, verb, stub_daemon, monkeypatch, capsys):
    """
    `reload` and `restart-daemon` must ask systemd to do it, not hunt a PID
    with pgrep and signal it directly — that pattern-matched a developer's own
    running node by accident once, which is why it was replaced.

    They must also reload the user manager's view of unit files first: a
    package upgrade only reloads the *system* manager (it runs as root and
    cannot reach a signed-in user's own), so the user manager can still be
    holding a stale unit when one of these runs.
    """
    monkeypatch.setattr(sys, "argv", ["meshbay-node", *argv])
    daemon_mod.main()

    systemctl_calls = dict(stub_daemon)["_systemctl_calls"]
    assert systemctl_calls == [
        ["systemctl", "--user", "daemon-reload"],
        ["systemctl", "--user", verb, "meshbay-node"],
    ]
    assert not capsys.readouterr().err


@pytest.mark.parametrize("argv", [["reload"], ["restart-daemon"]])
def test_lifecycle_commands_report_systemctl_failure(
        argv, stub_daemon, monkeypatch, capsys):
    """A unit that refuses (not installed, not running) must exit non-zero."""
    import subprocess

    monkeypatch.setattr(
        subprocess, "run",
        lambda a, **k: subprocess.CompletedProcess(
            a, 1, stdout="", stderr="Unit meshbay-node.service not loaded.\n"))
    monkeypatch.setattr(sys, "argv", ["meshbay-node", *argv])
    with pytest.raises(SystemExit) as exc:
        daemon_mod.main()
    assert exc.value.code == 1
    assert "not loaded" in capsys.readouterr().out