"""
Cron job management tools for Inara.

Jobs are stored in inara/CRONS.json and registered with the live APScheduler
instance so they survive restarts and take effect immediately without a restart.

Tools:
  cron_list          — show all scheduled jobs
  cron_add           — create a job and register it immediately
  cron_remove        — delete a job and unschedule it
  cron_toggle        — pause or resume a job without deleting it
  reminders_clear    — erase inara/REMINDERS.md (dismiss all pending reminders)
"""

import asyncio
import secrets
from datetime import datetime, timezone
from pathlib import Path

from persona import persona_path, get_user, get_persona
from cron_runner import load_crons, save_crons, parse_schedule


def _now() -> str:
    return datetime.now(timezone.utc).isoformat()


def _short_id() -> str:
    return "c_" + secrets.token_urlsafe(6)


# ---------------------------------------------------------------------------
# Sync implementations
# ---------------------------------------------------------------------------

def _cron_list() -> str:
    crons = load_crons(get_user(), get_persona())
    if not crons:
        return "No crons scheduled."

    lines = [f"Crons ({len(crons)}):\n"]
    for c in crons:
        status = "enabled" if c.get("enabled", True) else "PAUSED "
        last = c.get("last_run")
        last_str = last[:10] if last else "never"
        lines.append(
            f"  {c['id']}  [{status}]  {c['schedule']:<18}  "
            f"{c['type']:<7}  {c['label']}  (last: {last_str})"
        )
    return "\n".join(lines)


def _cron_add(label: str, schedule: str, job_type: str, payload: str) -> str:
    # Validate schedule first — raises ValueError with a clear message on bad input
    try:
        sched_kwargs = parse_schedule(schedule)
    except ValueError as e:
        return f"Bad schedule: {e}"

    if job_type not in ("remind", "note"):
        return "Bad type: must be 'remind' or 'note'."

    current_user = get_user()
    current_persona = get_persona()
    crons = load_crons(current_user, current_persona)
    job = {
        "id": _short_id(),
        "user": current_user,
        "persona": current_persona,
        "label": label,
        "schedule": schedule,
        "type": job_type,
        "payload": payload,
        "enabled": True,
        "created_at": _now(),
        "last_run": None,
    }
    crons.append(job)
    save_crons(crons, current_user, current_persona)

    # Register with the live scheduler
    _scheduler_add(job, sched_kwargs)

    return f"Created and scheduled: {job['id']}  {schedule}  [{job_type}]  {label}  (user: {current_user}, persona: {current_persona})"


def _cron_remove(cron_id: str) -> str:
    user = get_user()
    persona = get_persona()
    crons = load_crons(user, persona)
    before = len(crons)
    crons = [c for c in crons if c["id"] != cron_id]
    if len(crons) == before:
        return f"Not found: {cron_id}"
    save_crons(crons, user, persona)
    _scheduler_remove(f"{user}:{persona}:{cron_id}")
    return f"Removed: {cron_id}"


def _cron_toggle(cron_id: str) -> str:
    user = get_user()
    persona = get_persona()
    crons = load_crons(user, persona)
    for c in crons:
        if c["id"] == cron_id:
            c["enabled"] = not c.get("enabled", True)
            save_crons(crons, user, persona)
            action = "resumed" if c["enabled"] else "paused"
            sched_id = f"{user}:{persona}:{cron_id}"
            _scheduler_resume(sched_id) if c["enabled"] else _scheduler_pause(sched_id)
            return f"{action.capitalize()}: {cron_id}  {c['label']}"
    return f"Not found: {cron_id}"


def _reminders_clear() -> str:
    p = persona_path() / "REMINDERS.md"
    p.write_text("")
    return "Reminders cleared."


# ---------------------------------------------------------------------------
# Scheduler bridge — thin wrappers so the tool layer never touches APScheduler
# directly, keeping it swappable
# ---------------------------------------------------------------------------

def _scheduler_add(job: dict, sched_kwargs: dict) -> None:
    try:
        import scheduler as sched_module
        from cron_runner import run_job
        s = sched_module.get_scheduler()
        if s and s.running:
            sched_id = f"{job.get('user', 'scott')}:{job.get('persona', 'inara')}:{job['id']}"
            s.add_job(
                lambda j=job: asyncio.ensure_future(run_job(j)),
                "cron",
                id=sched_id,
                replace_existing=True,
                **sched_kwargs,
            )
    except Exception as e:
        import logging
        logging.getLogger(__name__).warning("scheduler_add failed: %s", e)


def _scheduler_remove(job_id: str) -> None:
    try:
        import scheduler as sched_module
        s = sched_module.get_scheduler()
        if s and s.running:
            s.remove_job(job_id)
    except Exception:
        pass


def _scheduler_pause(job_id: str) -> None:
    try:
        import scheduler as sched_module
        s = sched_module.get_scheduler()
        if s and s.running:
            s.pause_job(job_id)
    except Exception:
        pass


def _scheduler_resume(job_id: str) -> None:
    try:
        import scheduler as sched_module
        s = sched_module.get_scheduler()
        if s and s.running:
            s.resume_job(job_id)
    except Exception:
        pass


# ---------------------------------------------------------------------------
# Async wrappers
# ---------------------------------------------------------------------------

async def cron_list() -> str:
    return await asyncio.to_thread(_cron_list)


async def cron_add(label: str, schedule: str, job_type: str, payload: str) -> str:
    return await asyncio.to_thread(_cron_add, label, schedule, job_type, payload)


async def cron_remove(cron_id: str) -> str:
    return await asyncio.to_thread(_cron_remove, cron_id)


async def cron_toggle(cron_id: str) -> str:
    return await asyncio.to_thread(_cron_toggle, cron_id)


async def reminders_clear() -> str:
    return await asyncio.to_thread(_reminders_clear)