"""
ControlLoop single-tick worker.

Entry point for GitHub Actions cron (every 15 min).
Usage:
    python -m backend.workers.control_tick
    python -m backend.workers.control_tick --dry-run
"""

from __future__ import annotations

import argparse
import json
import logging
import sys
from datetime import datetime, timezone
from pathlib import Path

# Ensure project root is on sys.path
PROJECT_ROOT = Path(__file__).resolve().parent.parent.parent
if str(PROJECT_ROOT) not in sys.path:
    sys.path.insert(0, str(PROJECT_ROOT))

# Load .env if present (local dev)
try:
    from dotenv import load_dotenv
    load_dotenv(PROJECT_ROOT / ".env")
except ImportError:
    pass

logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s [%(levelname)s] %(name)s: %(message)s",
)
log = logging.getLogger("control_tick")


def main():
    parser = argparse.ArgumentParser(description="Run one ControlLoop tick")
    parser.add_argument("--dry-run", action="store_true", help="Compute decisions without dispatching")
    args = parser.parse_args()

    from src.control_loop import ControlLoop
    from src.data.redis_cache import get_redis

    log.info("Starting control tick (dry_run=%s)", args.dry_run)

    loop = ControlLoop(dry_run=args.dry_run)
    result = loop.tick()

    # Serialise result
    result_dict = result.__dict__ if hasattr(result, "__dict__") else {"raw": str(result)}
    result_dict["_timestamp"] = datetime.now(timezone.utc).isoformat()
    result_dict["_dry_run"] = args.dry_run

    # Store in Redis for the API to read
    redis = get_redis()
    if redis:
        # Convert to JSON-safe dict
        safe = json.loads(json.dumps(result_dict, default=str))
        redis.set_json("control:last_tick", safe, ttl=1200)  # 20 min TTL
        log.info("Tick result saved to Redis")

        # Also persist budget state for the /control/budget endpoint
        from config.settings import MAX_ENERGY_REDUCTION_PCT
        budget_info = {
            "energy_cost_kwh": result_dict.get("energy_cost_kwh", 0),
            "budget_spent_kwh": result_dict.get("budget_spent_kwh", 0),
            "budget_remaining_kwh": result_dict.get("budget_remaining_kwh", 0),
            "daily_budget_kwh": 25.0 * MAX_ENERGY_REDUCTION_PCT / 100.0,
            "stage": result_dict.get("stage_id", "unknown"),
            "last_updated": datetime.now(timezone.utc).isoformat(),
        }
        redis.set_json("control:budget", budget_info, ttl=1800)  # 30 min TTL
    else:
        log.warning("Redis not available — tick result not persisted")

    log.info("Tick complete: %s", json.dumps(result_dict, default=str, indent=2)[:500])

    # Budget alert: warn if >80% spent before 14:00 IST
    _check_budget_alert(result_dict)


def _check_budget_alert(tick: dict) -> None:
    """Log a warning (visible in GitHub Actions) if budget is nearly exhausted."""
    import os
    try:
        from datetime import datetime, timezone, timedelta
        now_utc = datetime.now(timezone.utc)
        now_israel = now_utc + timedelta(hours=2)  # approximate IST

        remaining = tick.get("budget_remaining_kwh", None)
        if remaining is None or remaining == 0:
            return  # no budget data or dormant season

        # Only alert before 14:00 IST (still daylight hours left)
        if now_israel.hour >= 14:
            return

        # Get today's total budget from Redis
        from src.data.redis_cache import get_redis
        redis = get_redis()
        if not redis:
            return
        budget_data = redis.get_json("control:budget")
        if not budget_data or "plan" not in budget_data:
            return

        plan = budget_data["plan"]
        total = sum(plan.get("slot_budgets", {}).values()) + plan.get("daily_margin_remaining_kWh", 0)
        spent = plan.get("cumulative_spent", 0)

        if total > 0 and spent / (total + spent) > 0.8:
            log.warning(
                "BUDGET ALERT: %.1f%% of daily budget spent before %02d:00 IST "
                "(spent=%.3f kWh, remaining=%.3f kWh)",
                spent / (total + spent) * 100,
                now_israel.hour,
                spent,
                remaining,
            )
            # Future: send webhook/email here
            webhook_url = os.environ.get("BUDGET_ALERT_WEBHOOK")
            if webhook_url:
                import requests
                requests.post(webhook_url, json={
                    "text": f"SolarWine Budget Alert: {spent/(total+spent)*100:.0f}% spent before {now_israel.hour}:00 IST",
                    "spent_kwh": round(spent, 3),
                    "remaining_kwh": round(remaining, 3),
                }, timeout=5)
    except Exception as exc:
        log.debug("Budget alert check failed: %s", exc)


if __name__ == "__main__":
    main()