"""Tests for Executor container_restart dispatch — the no-SSH remediation path.

Covers kb/phases/backlog.md "PROJEKT: remediacja bez SSH": the executor never
shells out to SSH for container_restart. Instead it drops a dispatch file for
the target node's node-agent to pick up, and later resolves the action from
either a matching action_result event or a timeout — never leaving it running
forever.
"""
from __future__ import annotations

import json
import os
import sys
import time
from pathlib import Path
from unittest.mock import MagicMock

import pytest

sys.path.insert(0, str(Path(__file__).parent.parent / "src"))
import executor as executor_module
from executor import Executor


def _setup_executor(tmp_path: Path, monkeypatch) -> Executor:
    actions = tmp_path / "actions"
    events = tmp_path / "events"
    repo = tmp_path / "repo"
    state = tmp_path / "state"
    for d in (actions, events, repo, state):
        d.mkdir(parents=True, exist_ok=True)

    monkeypatch.setattr(executor_module, "ACTIONS_DIR", actions)
    monkeypatch.setattr(executor_module, "EVENTS_DIR", events)
    monkeypatch.setattr(executor_module, "DISPATCH_DIR", actions / "dispatch")
    # Must be patched too: _ensure_dirs() creates it, and the module default
    # points at the real /opt/homelab.
    monkeypatch.setattr(executor_module, "DEPLOY_DISPATCH_DIR", actions / "deploy")
    monkeypatch.setattr(executor_module, "REPO_ROOT", repo)
    return Executor()


def _write_approved(tmp_path, action_id, node="piha", service="zigbee2mqtt",
                     container_name=None, action_type="container_restart"):
    action = {
        "action_id": action_id,
        "type": action_type,
        "node": node,
        "service": service,
        "container_name": container_name or service,
        "status": "approved",
        "timestamp": time.time(),
    }
    path = tmp_path / "actions" / "approved" / f"{action_id}.json"
    path.write_text(json.dumps(action))
    return path


def _write_action_result_event(tmp_path, node, action_id, success, error="", ts=None):
    ts = int(ts if ts is not None else time.time())
    node_dir = tmp_path / "events" / node
    node_dir.mkdir(parents=True, exist_ok=True)
    event = {
        "id": f"evt-{node}-{ts}-action_result-{action_id}",
        "timestamp": ts,
        "type": "action_result",
        "node": node,
        "payload": {"action_id": action_id, "success": success, "error": error, "node": node},
    }
    path = node_dir / f"evt-{node}-{ts}-action_result-{action_id}.json"
    path.write_text(json.dumps(event))
    return path


def _read(tmp_path, state, action_id):
    return json.loads((tmp_path / "actions" / state / f"{action_id}.json").read_text())


def _exists(tmp_path, state, action_id):
    return (tmp_path / "actions" / state / f"{action_id}.json").exists()


# ---------------------------------------------------------------------------
# Dispatch: no SSH, writes to DISPATCH_DIR, stays in running
# ---------------------------------------------------------------------------

def test_container_restart_dispatched_not_ssh(tmp_path, monkeypatch):
    ex = _setup_executor(tmp_path, monkeypatch)
    called = {"ssh": False}

    def fake_run(cmd, **kwargs):
        if cmd and cmd[0] == "ssh":
            called["ssh"] = True
        raise AssertionError("executor must never invoke subprocess for container_restart")

    monkeypatch.setattr(executor_module.subprocess, "run", fake_run)

    action_file = _write_approved(tmp_path, "cr-1", node="piha", container_name="zigbee2mqtt")
    ex._execute_action(action_file)

    assert not called["ssh"]
    dispatch_file = tmp_path / "actions" / "dispatch" / "piha" / "cr-1.json"
    assert dispatch_file.exists()
    payload = json.loads(dispatch_file.read_text())
    assert payload["action_id"] == "cr-1"
    assert payload["container_name"] == "zigbee2mqtt"
    assert payload["node"] == "piha"

    # Stays in running — not resolved synchronously.
    assert _exists(tmp_path, "running", "cr-1")
    assert not _exists(tmp_path, "completed", "cr-1")
    assert not _exists(tmp_path, "failed", "cr-1")


def test_container_restart_with_no_node_does_not_crash(tmp_path, monkeypatch):
    ex = _setup_executor(tmp_path, monkeypatch)
    action_file = _write_approved(tmp_path, "cr-none", node="", container_name="x")

    ex._execute_action(action_file)  # must not raise

    assert list((tmp_path / "actions" / "dispatch").glob("*/cr-none.json")) == []


# ---------------------------------------------------------------------------
# Reconcile: action_result event resolves the action
# ---------------------------------------------------------------------------

def test_reconcile_moves_to_completed_on_success_result(tmp_path, monkeypatch):
    ex = _setup_executor(tmp_path, monkeypatch)
    action_file = _write_approved(tmp_path, "cr-2", node="piha")
    ex._execute_action(action_file)

    _write_action_result_event(tmp_path, "piha", "cr-2", success=True)
    ex._reconcile_running_actions()

    assert _exists(tmp_path, "completed", "cr-2")
    assert not _exists(tmp_path, "running", "cr-2")


def test_reconcile_moves_to_failed_on_failure_result(tmp_path, monkeypatch):
    ex = _setup_executor(tmp_path, monkeypatch)
    action_file = _write_approved(tmp_path, "cr-3", node="piha")
    ex._execute_action(action_file)

    _write_action_result_event(tmp_path, "piha", "cr-3", success=False, error="no such container")
    ex._reconcile_running_actions()

    assert _exists(tmp_path, "failed", "cr-3")
    data = _read(tmp_path, "failed", "cr-3")
    assert data["error"] == "no such container"


def test_reconcile_ignores_stale_result_from_previous_run(tmp_path, monkeypatch):
    """A same-action_id result left over from an earlier run (before this run's
    started_at) must never resolve the CURRENT run — action_ids are
    deterministic (container-restart-<node>-<service>) and can repeat days
    apart."""
    ex = _setup_executor(tmp_path, monkeypatch)

    # Stale result from "yesterday"
    stale_ts = int(time.time()) - 86_400
    _write_action_result_event(tmp_path, "piha", "cr-4", success=True, ts=stale_ts)

    action_file = _write_approved(tmp_path, "cr-4", node="piha")
    ex._execute_action(action_file)  # started_at is "now", after the stale event

    ex._reconcile_running_actions()

    assert _exists(tmp_path, "running", "cr-4")
    assert not _exists(tmp_path, "completed", "cr-4")


def test_reconcile_no_op_when_no_result_and_not_timed_out(tmp_path, monkeypatch):
    ex = _setup_executor(tmp_path, monkeypatch)
    action_file = _write_approved(tmp_path, "cr-5", node="piha")
    ex._execute_action(action_file)

    ex._reconcile_running_actions()

    assert _exists(tmp_path, "running", "cr-5")


# ---------------------------------------------------------------------------
# Timeout
# ---------------------------------------------------------------------------

def test_reconcile_times_out_stuck_action(tmp_path, monkeypatch):
    monkeypatch.setattr(executor_module, "ACTION_TIMEOUT_SECS", 5)
    ex = _setup_executor(tmp_path, monkeypatch)
    action_file = _write_approved(tmp_path, "cr-6", node="piha")
    ex._execute_action(action_file)

    running_path = tmp_path / "actions" / "running" / "cr-6.json"
    data = json.loads(running_path.read_text())
    data["started_at"] = time.time() - 10  # older than the 5s timeout
    running_path.write_text(json.dumps(data))

    ex._reconcile_running_actions()

    assert _exists(tmp_path, "failed", "cr-6")
    data = _read(tmp_path, "failed", "cr-6")
    assert "Timed out" in data["error"]


def test_reconcile_does_not_time_out_before_deadline(tmp_path, monkeypatch):
    monkeypatch.setattr(executor_module, "ACTION_TIMEOUT_SECS", 300)
    ex = _setup_executor(tmp_path, monkeypatch)
    action_file = _write_approved(tmp_path, "cr-7", node="piha")
    ex._execute_action(action_file)

    ex._reconcile_running_actions()

    assert _exists(tmp_path, "running", "cr-7")


# ---------------------------------------------------------------------------
# Other action types are untouched by the reconcile loop
# ---------------------------------------------------------------------------

def test_reconcile_ignores_synchronous_running_actions(tmp_path, monkeypatch):
    """Only dispatched types (container_restart, redeploy) are reconciled here.
    disk_cleanup/alert_only resolve inside _execute_action and never linger."""
    ex = _setup_executor(tmp_path, monkeypatch)
    running_path = tmp_path / "actions" / "running" / "disk-cleanup-x.json"
    running_path.write_text(json.dumps({
        "action_id": "disk-cleanup-x", "type": "disk_cleanup", "node": "piha",
        "started_at": time.time() - 999_999,
    }))

    ex._reconcile_running_actions()

    assert running_path.exists()  # untouched


def test_alert_only_action_resolves_synchronously_not_via_dispatch(tmp_path, monkeypatch):
    ex = _setup_executor(tmp_path, monkeypatch)
    action_file = _write_approved(tmp_path, "alert-1", node="piha", action_type="alert_only")

    ex._execute_action(action_file)

    assert _exists(tmp_path, "completed", "alert-1")
    assert not (tmp_path / "actions" / "dispatch").exists() or \
        not list((tmp_path / "actions" / "dispatch").glob("**/*.json"))


# ---------------------------------------------------------------------------
# Inbox permissions (dispatch leak, 2026-08-06)
#
# The per-node inbox is written here but drained by the target node over rsync
# --remove-source-files, authenticating as a different user that is only a
# group member. Unlinking the fetched file needs write permission on the
# containing dir; at 0o755 it silently fails and the node re-pulls the same
# action forever.
# ---------------------------------------------------------------------------

@pytest.fixture
def restrictive_umask():
    """0o022 masks the group-write bit out of mkdir(mode=0o775) — the reason
    the fix cannot rely on the mode argument alone."""
    old = os.umask(0o022)
    yield
    os.umask(old)


def _mode(path: Path) -> int:
    return path.stat().st_mode & 0o777


def test_dispatch_inbox_is_group_writable(tmp_path, monkeypatch, restrictive_umask):
    ex = _setup_executor(tmp_path, monkeypatch)

    ex._execute_action(_write_approved(tmp_path, "cr-perm", node="piha"))

    inbox = tmp_path / "actions" / "dispatch" / "piha"
    assert (inbox / "cr-perm.json").exists()
    assert _mode(inbox) == 0o775


def test_deploy_inbox_is_group_writable(tmp_path, monkeypatch, restrictive_umask):
    """Same defect, same rsync-pull drain — the deploy runner's inbox needs it too."""
    ex = _setup_executor(tmp_path, monkeypatch)

    ex._execute_action(
        _write_approved(tmp_path, "rd-perm", node="piha", action_type="redeploy")
    )

    inbox = tmp_path / "actions" / "deploy" / "piha"
    assert (inbox / "rd-perm.json").exists()
    assert _mode(inbox) == 0o775


def test_existing_inbox_is_repaired_in_place(tmp_path, monkeypatch, restrictive_umask):
    """Inboxes already on disk fleet-wide were created at 0o755 by an earlier
    build; dispatching to one must fix it rather than inherit it."""
    ex = _setup_executor(tmp_path, monkeypatch)
    inbox = tmp_path / "actions" / "dispatch" / "piha"
    inbox.mkdir(parents=True)
    os.chmod(inbox, 0o755)

    ex._execute_action(_write_approved(tmp_path, "cr-repair", node="piha"))

    assert _mode(inbox) == 0o775


def test_dispatch_survives_unsettable_mode(tmp_path, monkeypatch, restrictive_umask):
    """A chmod failure (inbox owned by another user) must not cost us the
    dispatch — the action still executes on the node; only the source delete
    stays broken, and the node warns about that."""
    ex = _setup_executor(tmp_path, monkeypatch)
    monkeypatch.setattr(
        executor_module.os, "chmod",
        MagicMock(side_effect=PermissionError("Operation not permitted")),
    )

    ex._execute_action(_write_approved(tmp_path, "cr-chmod-fail", node="piha"))

    assert (tmp_path / "actions" / "dispatch" / "piha" / "cr-chmod-fail.json").exists()
    assert _exists(tmp_path, "running", "cr-chmod-fail")