"""
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
    ["group", "add", "g", "--dir", "/tmp/media", "--no-writable"],
    ["root", "list"],
    ["root", "add"],                       # missing path: usage, then exit
    ["root", "add", "/tmp/media", "--writable", "--removable"],
    ["root", "remove", "media", "--yes"],
    ["root", "set", "media", "--no-writable"],
    ["root", "set", "media"],              # nothing to change: usage, then exit
    ["root", "eject", "media"],
    ["root", "plug", "media"],
    ["gek", "init"],
    ["gek", "rotate", "--yes"],
    ["gek-init"],
    ["member", "list"],
    ["member", "invite", "bob"],
    ["member", "revoke", "bob"],
    ["member", "unpin", "bob"],
    # Removed, and it has to say so rather than offering a username for a verb
    # that no longer takes one.
    ["member", "upload"],
    ["operator", "pair"],
    ["file", "list"],
    ["file", "rm", "abc", "--yes"],
    ["video", "rematch", "--yes"],
    ["denylist", "show"],
    ["denylist", "clear", "--yes"],
    ["stun", "list"],
    ["reload"],
    ["restart-daemon"],
    ["autostart", "status"],
    ["service", "status"],
]


@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.skipif(sys.platform == "win32",
                    reason="systemd lifecycle; Windows uses the loopback API / "
                           "Startup-folder launcher, covered by test_platform.py")
@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.skipif(sys.platform == "win32",
                    reason="systemd lifecycle; Windows uses the loopback API / "
                           "Startup-folder launcher, covered by test_platform.py")
@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


def test_a_bare_invocation_with_no_config_yet_exits_cleanly(monkeypatch, tmp_path, capsys):
    """
    A bare `meshbay-node` — no subcommand, nothing dispatches, falls through to
    "start the daemon" at the bottom of main() — is exactly what the Windows W3
    Startup .vbs and the service-mode Scheduled Task both run unattended. On a
    fresh install neither has ever provisioned anything, so this is the first
    thing that runs on the very first boot, quite possibly before the user has
    ever opened the client.

    This must fail closed, fast, and without a trace: no exception (nothing
    catches one — the .vbs and the Scheduled Task are both headless, so an
    uncaught crash is invisible and, run on every boot, an inert but permanent
    fixture in the Task Scheduler history and Windows' own Application log).
    Confirmed by hand first: measured under a second and zero bytes written
    to disk against a real, empty %LOCALAPPDATA%.

    load_config() already returns an empty Config when the path does not
    exist rather than raising — this pins that main() then notices the empty
    hub.username and exits before ever reaching NodeDaemon()/asyncio.run(),
    so nothing here has to mock the daemon startup at all.
    """
    missing_config = tmp_path / "does-not-exist" / "node.toml"
    monkeypatch.setattr(daemon_mod, "DEFAULT_CONFIG_PATH", missing_config)
    monkeypatch.setattr(sys, "argv", ["meshbay-node"])

    with pytest.raises(SystemExit) as exc:
        daemon_mod.main()

    assert exc.value.code == 1
    assert "meshbay-node init" in capsys.readouterr().out
    assert not missing_config.parent.exists(), (
        "a fresh, unprovisioned start must not create anything on disk")


def test_a_removed_verb_says_what_replaced_it():
    """
    `member upload` used to set a group-wide switch that no longer exists. It
    reached the usage line for the *other* member verbs — "usage: meshbay-node
    member upload <username>" — which advertises a removed feature and sends
    the operator looking for a username it would then reject.

    Naming it costs three lines and is the difference between an operator
    finding `root set --writable` and concluding the CLI is broken.
    """
    import inspect
    source = inspect.getsource(daemon_mod.main)
    start = source.index('if args.command == "member":')
    block = source[start:source.index('if args.command == "group":', start)]

    assert 'sub == "upload"' in block, (
        "`member upload` falls through to the generic usage line")
    guidance = block[block.index('sub == "upload"'):]
    guidance = guidance[:guidance.index("sys.exit")]
    assert "root set" in guidance and "--writable" in guidance, (
        "the message does not name what replaced it")


def test_there_is_no_way_to_create_a_group_in_the_old_shape():
    """
    `--upload-dir` is gone, and documenting it as deprecated was the wrong
    answer — which is what it got at first.

    It wrote `upload_dir` into a brand-new `[[groups]]` block, and
    `GroupConfig.__post_init__` reads that by forcing *every other root
    read-only* and appending that path as the one writable one. So
    `group add --dir X --writable --upload-dir Y` silently made X read-only:
    two mechanisms deciding which directories accept uploads, one of them
    invisible, in a group created after the model that replaced it.

    Reading it stays — an existing node.toml must keep working, and that is the
    only legitimate use. Writing it does not.
    """
    import inspect
    source = inspect.getsource(daemon_mod.main)
    assert "--upload-dir" not in source, (
        "the CLI can still create a group in the pre-RO/RW shape")

    from meshbay_node import ops
    params = inspect.signature(ops.attach_group).parameters
    assert "upload_dir" not in params, (
        "attach_group still writes the legacy key")

    # The read path is deliberately untouched.
    from meshbay_node.config import GroupConfig
    assert "upload_dir" in inspect.getsource(GroupConfig), (
        "an existing node.toml using upload_dir would stop working")