"""Tests for /watch, /watches, /unwatch slash commands."""

from __future__ import annotations

import io
import threading
import time
from unittest.mock import MagicMock

import pytest
from rich.console import Console

from integrations.telegram.credentials import TelegramCredentials
from platform.common.task_types import TaskKind, TaskStatus
from surfaces.interactive_shell.command_registry import SLASH_COMMANDS, dispatch_slash
from surfaces.interactive_shell.command_registry.watch_cmds import (
    WatchdogStartSpec,
    parse_watch_argv,
)
from surfaces.interactive_shell.session import Session


def _capture() -> tuple[Console, io.StringIO]:
    buf = io.StringIO()
    return Console(file=buf, force_terminal=False, highlight=False), buf


def test_slash_registry_includes_watchdog_commands() -> None:
    assert "/watch" in SLASH_COMMANDS
    assert "/watches" in SLASH_COMMANDS
    assert "/unwatch" in SLASH_COMMANDS


def test_parse_watch_argv_rejects_non_numeric_pid() -> None:
    out = parse_watch_argv(["not-a-pid"])
    assert isinstance(out, str)
    assert "invalid pid" in out


def test_parse_watch_argv_rejects_non_positive_pid() -> None:
    out = parse_watch_argv(["0"])
    assert isinstance(out, str)
    assert "positive" in out


def test_parse_watch_argv_parses_flags() -> None:
    raw = parse_watch_argv(["999", "--max-cpu", "80", "--max-runtime", "10s", "--once"])
    assert isinstance(raw, WatchdogStartSpec)
    assert raw.pid == 999
    assert raw.max_cpu == 80.0
    assert raw.max_runtime_seconds == 10.0
    assert raw.once is True


def test_dispatch_watch_creates_watchdog_task(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    monkeypatch.setattr(
        "surfaces.interactive_shell.command_registry.watch_cmds.load_credentials_from_env",
        lambda *_a, **_kw: TelegramCredentials(bot_token="x", chat_id="1"),
    )
    monkeypatch.setattr(
        "surfaces.interactive_shell.command_registry.watch_cmds.pid_exists",
        lambda _pid: True,
    )

    def _fake_start(**_kwargs: object) -> None:
        return None

    monkeypatch.setattr(
        "surfaces.interactive_shell.command_registry.watch_cmds.start_watchdog_daemon_thread",
        _fake_start,
    )

    session = Session()
    session.terminal.trust_mode = True
    console, buf = _capture()
    dispatch_slash(
        f"/watch {__import__('os').getpid()} --max-cpu 80",
        session,
        console,
        is_tty=True,
    )

    watchdogs = [t for t in session.task_registry.list_recent(20) if t.kind == TaskKind.WATCHDOG]
    assert len(watchdogs) == 1
    assert watchdogs[0].status == TaskStatus.RUNNING
    assert "max_cpu=80" in (watchdogs[0].command or "")
    assert "started" in buf.getvalue()


def test_unwatch_marks_watchdog_cancelled(monkeypatch: pytest.MonkeyPatch) -> None:
    monkeypatch.setattr(
        "surfaces.interactive_shell.command_registry.watch_cmds.load_credentials_from_env",
        lambda *_a, **_kw: TelegramCredentials(bot_token="x", chat_id="1"),
    )
    monkeypatch.setattr(
        "surfaces.interactive_shell.command_registry.watch_cmds.pid_exists",
        lambda _pid: True,
    )

    barrier = threading.Event()

    def _slow_watchdog(**kwargs: object) -> None:
        task = kwargs["task"]
        barrier.set()
        while not task.cancel_requested.is_set():
            time.sleep(0.02)
        task.mark_cancelled()

    monkeypatch.setattr(
        "surfaces.interactive_shell.command_registry.watch_cmds.start_watchdog_daemon_thread",
        lambda **kw: threading.Thread(target=_slow_watchdog, kwargs=kw, daemon=True).start(),
    )

    session = Session()
    session.terminal.trust_mode = True
    console, _ = _capture()
    dispatch_slash(
        f"/watch {__import__('os').getpid()} --interval 1s",
        session,
        console,
        is_tty=True,
    )
    assert barrier.wait(timeout=2.0), "watchdog thread should start"
    task = next(t for t in session.task_registry.list_recent(20) if t.kind == TaskKind.WATCHDOG)
    dispatch_slash(f"/unwatch {task.task_id}", session, console, is_tty=True)
    for _ in range(200):
        task.refresh_rehydrated_status()
        if task.status == TaskStatus.CANCELLED:
            break
        time.sleep(0.02)
    assert task.status == TaskStatus.CANCELLED


def test_unwatch_rejects_non_watchdog_task() -> None:
    session = Session()
    session.terminal.trust_mode = True
    inv = session.task_registry.create(TaskKind.INVESTIGATION, command="x")
    inv.mark_running()
    console, buf = _capture()
    dispatch_slash(f"/unwatch {inv.task_id}", session, console, is_tty=True)
    assert "not a watchdog" in buf.getvalue()


def test_run_watchdog_respects_cancel(monkeypatch: pytest.MonkeyPatch) -> None:
    from datetime import UTC, datetime, timedelta

    from platform.common.task_registry import TaskRegistry
    from tools.system.fleet_monitoring.probe import ProcessSnapshot
    from tools.system.watch_dog.monitor import run_watchdog

    reg = TaskRegistry()
    task = reg.create(TaskKind.WATCHDOG, command="watchdog pid=1")
    task.mark_running()
    dispatcher = MagicMock()
    dispatcher.dispatch = MagicMock(return_value=True)

    started_at = datetime.now(UTC) - timedelta(seconds=5)
    snap = ProcessSnapshot(
        pid=1,
        cpu_percent=1.0,
        rss_mb=10.0,
        num_fds=None,
        num_connections=None,
        status="running",
        started_at=started_at,
    )

    monkeypatch.setattr("tools.system.watch_dog.monitor.probe", lambda *_a, **_kw: snap)

    thread = threading.Thread(
        target=run_watchdog,
        kwargs={
            "task": task,
            "watched_pid": 1,
            "interval_seconds": 0.15,
            "max_cpu": None,
            "max_runtime_seconds": None,
            "max_rss_mib": None,
            "once": False,
            "dispatcher": dispatcher,
            "on_alarm": None,
        },
        daemon=True,
    )
    thread.start()
    time.sleep(0.05)
    task.request_cancel()
    thread.join(timeout=3.0)
    assert task.status == TaskStatus.CANCELLED


def test_run_watchdog_once_without_thresholds_exits(monkeypatch: pytest.MonkeyPatch) -> None:
    """``--once`` with no threshold flags must finish after one sample (Greptile #1969)."""
    from datetime import UTC, datetime, timedelta

    from platform.common.task_registry import TaskRegistry
    from tools.system.fleet_monitoring.probe import ProcessSnapshot
    from tools.system.watch_dog.monitor import run_watchdog

    reg = TaskRegistry()
    task = reg.create(TaskKind.WATCHDOG, command="watchdog pid=1")
    task.mark_running()
    dispatcher = MagicMock()
    dispatcher.dispatch = MagicMock(return_value=True)

    started_at = datetime.now(UTC) - timedelta(seconds=1)
    snap = ProcessSnapshot(
        pid=1,
        cpu_percent=1.0,
        rss_mb=10.0,
        num_fds=None,
        num_connections=None,
        status="running",
        started_at=started_at,
    )
    monkeypatch.setattr("tools.system.watch_dog.monitor.probe", lambda *_a, **_kw: snap)

    run_watchdog(
        task=task,
        watched_pid=1,
        interval_seconds=0.1,
        max_cpu=None,
        max_runtime_seconds=None,
        max_rss_mib=None,
        once=True,
        dispatcher=dispatcher,
        on_alarm=None,
    )
    assert task.status == TaskStatus.COMPLETED
    assert task.result == "single sample (once)"
    dispatcher.dispatch.assert_not_called()