# SPDX-License-Identifier: GPL-3.0-or-later
"""Action layer for the tray applet: drives the CLI and systemctl.

No GUI imports. Every subprocess call is timeout-bounded and check=False so a
failed command degrades to an ActionResult rather than raising.
"""
from __future__ import annotations

import json
import subprocess
import webbrowser
from dataclasses import dataclass
from typing import Callable, Sequence

from ..config import Config

Runner = Callable[[Sequence[str], int], "subprocess.CompletedProcess"]

DAEMON_UNIT = "enodia-sentinel.service"
WEB_UNIT = "enodia-sentinel-web.service"


def _default_runner(cmd: Sequence[str], timeout: int) -> "subprocess.CompletedProcess":
    try:
        return subprocess.run(list(cmd), capture_output=True, text=True,
                              timeout=timeout, check=False)
    except (OSError, subprocess.TimeoutExpired) as exc:
        return subprocess.CompletedProcess(list(cmd), 127, "", str(exc))


@dataclass(frozen=True)
class ActionResult:
    ok: bool
    message: str


def dashboard_url(cfg: Config) -> str:
    return f"https://127.0.0.1:{cfg.web_port}/"


def fetch_status(runner: Runner = _default_runner) -> "dict | None":
    proc = runner(["enodia-sentinel", "status", "--json"], 10)
    try:
        data = json.loads(proc.stdout)
        return data if isinstance(data, dict) else None
    except (ValueError, TypeError):
        return None


def _systemctl(action: str, unit: str, runner: Runner) -> ActionResult:
    proc = runner(["systemctl", action, unit], 30)
    if proc.returncode == 0:
        return ActionResult(True, f"{unit}: {action} ok")
    lines = (proc.stderr or proc.stdout or "").strip().splitlines()
    detail = lines[-1] if lines else f"exit {proc.returncode}"
    return ActionResult(False, f"{unit}: {action} failed — {detail}")


def start_daemon(runner: Runner = _default_runner) -> ActionResult:
    return _systemctl("start", DAEMON_UNIT, runner)


def stop_daemon(runner: Runner = _default_runner) -> ActionResult:
    return _systemctl("stop", DAEMON_UNIT, runner)


def restart_daemon(runner: Runner = _default_runner) -> ActionResult:
    return _systemctl("restart", DAEMON_UNIT, runner)


def is_active(unit: str, runner: Runner = _default_runner) -> bool:
    proc = runner(["systemctl", "is-active", unit], 10)
    return proc.stdout.strip() == "active"


def open_dashboard(cfg: Config, runner: Runner = _default_runner,
                   opener: Callable[[str], object] = webbrowser.open) -> ActionResult:
    if not is_active(WEB_UNIT, runner):
        started = _systemctl("start", WEB_UNIT, runner)
        if not started.ok:
            return started
    url = dashboard_url(cfg)
    opener(url)
    return ActionResult(True, f"Opened {url}")


def run_check(runner: Runner = _default_runner) -> ActionResult:
    proc = runner(["enodia-sentinel", "check", "--json"], 120)
    try:
        alerts = json.loads(proc.stdout)
    except (ValueError, TypeError):
        return ActionResult(False, "Quick check failed to produce JSON")
    count = len(alerts) if isinstance(alerts, list) else 0
    if count == 0:
        return ActionResult(True, "Quick check: no findings")
    return ActionResult(True, f"Quick check: {count} finding(s)")