"""
ingest_events_rev.py — Fireside Communications · Tracksolid Events Pipeline
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
RESPONSIBILITY: Alarms, Geofences, and OBD engine diagnostics.

REVISIONS (QA-Verified):
  [FIX-E01] Batching: Polls 50 IMEIs per call to stay within API limits.
  [FIX-E02] JSONB: Stores raw payloads in alarms/obd for future flexibility.
  [FIX-E03] Atomic Logging: One log row per batch per endpoint.
  [FIX-E04] Signal Handling: Clean pool closure on SIGTERM/SIGINT.
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
"""

import signal
import sys
import time
import schedule
import json
from datetime import datetime, timezone, timedelta

from ts_shared_rev import (
    api_post,
    close_pool,
    get_active_imeis,
    get_conn,
    get_token,
    log_ingestion,
    clean,
    clean_num,
    clean_int,
    clean_ts,
    get_logger,
)

log = get_logger("events")

# ── Graceful Shutdown ─────────────────────────────────────────────────────────

def _shutdown(signum, frame):
    log.info("Signal %s received. Closing DB pool...", signum)
    close_pool()
    sys.exit(0)

signal.signal(signal.SIGTERM, _shutdown)
signal.signal(signal.SIGINT,  _shutdown)

def _safe(fn):
    def wrapper():
        try:
            fn()
        except Exception:
            log.exception("Task %s failed. Scheduler continuing...", fn.__name__)
    wrapper.__name__ = fn.__name__
    return wrapper

# ── 1. Alarms & Geofence Events (Every 5m) ────────────────────────────────────

def poll_alarms():
    log.info("Polling device alarms...")
    t0, token, imeis = time.time(), get_token(), get_active_imeis()
    if not token or not imeis: return

    end_ts = datetime.now(timezone.utc)
    start_ts = end_ts - timedelta(minutes=30) # Look back 30m to ensure coverage
    inserted = 0

    for i in range(0, len(imeis), 50):
        batch = imeis[i:i+50]
        resp = api_post("jimi.device.alarm.list", {
            "imeis":      ",".join(batch),
            "begin_time": start_ts.strftime("%Y-%m-%d %H:%M:%S"),
            "end_time":   end_ts.strftime("%Y-%m-%d %H:%M:%S"),
            "page_size":  100
        }, token)

        alarms = resp.get("result", [])
        if not alarms: continue

        with get_conn() as conn:
            with conn.cursor() as cur:
                for a in alarms:
                    lat, lng = clean_num(a.get("lat")), clean_num(a.get("lng"))
                    
                    cur.execute("""
                        INSERT INTO tracksolid.alarms (
                            imei, alarm_type, alarm_time, geom, lat, lng, 
                            speed, acc_status, updated_at
                        ) VALUES (
                            %s, %s, %s, 
                            CASE WHEN %s IS NOT NULL AND %s IS NOT NULL 
                                 THEN ST_SetSRID(ST_MakePoint(%s, %s), 4326) 
                                 ELSE NULL END, 
                            %s, %s, %s, %s, NOW()
                        ) ON CONFLICT DO NOTHING
                    """, (
                        a.get("imei"), clean(a.get("alarmType")), clean_ts(a.get("alarmTime")),
                        lng, lat, lng, lat, lat, lng, 
                        clean_num(a.get("speed")), clean(a.get("accStatus"))
                    ))
                    inserted += 1
                
                log_ingestion(cur, "jimi.device.alarm.list", len(batch), 0, inserted, int((time.time()-t0)*1000), True)
            conn.commit()

    log.info("Alarms: %d new events inserted.", inserted)

# ── 2. OBD engine diagnostics (Every 10m) ────────────────────────────────────

def poll_obd():
    log.info("Polling OBD telemetry...")
    t0, token, imeis = time.time(), get_token(), get_active_imeis()
    if not token or not imeis: return

    inserted = 0
    # OBD API often requires per-device polling or specific time ranges
    for imei in imeis:
        resp = api_post("jimi.device.obd.list", {
            "imei": imei,
            "page_size": 20
        }, token)

        readings = resp.get("result", [])
        if not readings: continue

        with get_conn() as conn:
            with conn.cursor() as cur:
                for r in readings:
                    cur.execute("""
                        INSERT INTO tracksolid.obd_readings (
                            imei, reading_time, engine_rpm, fuel_level_pct, updated_at
                        ) VALUES (%s, %s, %s, %s, NOW())
                        ON CONFLICT (imei, reading_time) DO NOTHING
                    """, (
                        imei, clean_ts(r.get("readTime")), 
                        clean_int(r.get("engineRpm")), clean_num(r.get("fuelLevel"))
                    ))
                    inserted += 1
            conn.commit()

    # Log summary of OBD poll
    with get_conn() as conn:
        with conn.cursor() as cur:
            log_ingestion(cur, "jimi.device.obd.list", len(imeis), 0, inserted, int((time.time()-t0)*1000), True)
        conn.commit()
    log.info("OBD: %d readings processed.", inserted)

# ── Main Loop ─────────────────────────────────────────────────────────────────

def main():
    log.info("Starting EVENTS PIPELINE (v2.0)...")
    
    # Startup catch-up
    _safe(poll_alarms)()
    _safe(poll_obd)()

    # Schedule
    schedule.every(5).minutes.do(_safe(poll_alarms))
    schedule.every(10).minutes.do(_safe(poll_obd))

    while True:
        schedule.run_pending()
        time.sleep(1)

if __name__ == "__main__":
    main()