# regles.py
from engine.logger import log_info, log_debug
from decimal import Decimal
from datetime import datetime, timezone
from engine.utils import format_temps_decimal
# -------------------------------------------------
#  Règle de priorité : remplace, rejette, ou force tour
# -------------------------------------------------
def resolve_priority(
    cur,
    cnx,
    detail_table,
    tp_id,
    dossard,
    new_timestamp,
    new_priority,
    det_id,
    tp_config
):

    # -------------------------------------------------
    #  Lecture de la fenêtre backup pour priorité
    # -------------------------------------------------
    cfg = (
        tp_config[tp_id]["config"]
        .get("config_tp", {})
        .get("clef_temp_bbk", [])
    )

    backup_window = 0
    if cfg:
        try:
            backup_window = int(cfg[0]["value1"])
        except:
            backup_window = 0

    log_debug(f"[resolve_priority] backup_window={backup_window}")

    # -------------------------------------------------
    #  Si backup_window = 0 → toujours accepter
    # -------------------------------------------------
    if backup_window <= 0:
        return 1, None, None, None

    # -------------------------------------------------
    #  Recherche d'une lecture existante dans la fenêtre
    # -------------------------------------------------
    cur.execute(f"""
        SELECT detail_id, controller_priority, timestamp_read, tour
        FROM `{detail_table}`
        WHERE tp_id = %s
          AND cla_info_dossard = %s
          AND status = 1
          AND ABS(timestamp_read - %s) <= %s
        LIMIT 1
    """, (tp_id, dossard, str(new_timestamp), backup_window))

    row = cur.fetchone()

    # -------------------------------------------------
    #  Aucun doublon → accepter
    # -------------------------------------------------
    if not row:
        return 1, None, None, None

    old_id       = row["detail_id"]
    old_priority = row["controller_priority"]
    old_tour     = row["tour"]

    # -------------------------------------------------
    #  Comparaison des priorités
    # -------------------------------------------------

    # Nouvelle lecture moins prioritaire → rejet
    if new_priority > old_priority:
        return 0, "LOWER_PRIORITY", det_id, None

 

    
    # Nouvelle lecture plus prioritaire → remplacer
    if new_priority < old_priority:

        cur.execute(f"""
            UPDATE `{detail_table}`
            SET
                status = 0,
                reason_code = 'REPLACED_BY_HIGHER_PRIORITY',
                reason_ref_id = %s
            WHERE detail_id = %s
        """, (det_id, old_id))

        cnx.commit()

        forced_tour = old_tour
        return 1, None, None, forced_tour


    # Même priorité → rejet
    return 0, "EQUAL_PRIORITY", det_id, None

# -------------------------------------------------
#  Regle interval
# ------------------------------------------------
def check_interval_rule(cur, detail_table, tp_id, dossard, timestamp, interval_sec, det_id):
    """
    Retourne :
        status (1 ou 0)
        reason_code
        reason_ref_id
    """

    log_debug(f"[INTERVAL] tp_id={tp_id} dossard={dossard} interval_sec={interval_sec}")

    last_timestamp, last_tour = get_last_valid_lecture_time(cur, detail_table, tp_id, dossard, timestamp)

    log_debug(f"[INTERVAL] last_valid={last_timestamp} current={timestamp}")

    if last_timestamp and interval_sec > 0:
        delta = (timestamp - last_timestamp) 
        log_debug(f"[INTERVAL] delta={delta:.3f}s")

        if delta < interval_sec:
            reason = f"SKIP_INTERVAL {delta:.1f}s < {interval_sec}s"
            log_debug(
                f"[INTERVAL] REJECT dossard={dossard} tp_id={tp_id} "
                f"reason='{reason}' det_id={det_id}"
            )
            return (0, reason, det_id)

    log_debug(f"[INTERVAL] OK dossard={dossard} tp_id={tp_id}")
    return (1, None, None)


# -------------------------------------------------
#  Dernière lecture valide (timestamp_read < T)
# -------------------------------------------------
def get_last_valid_lecture_time(cur, detail_table, tp_id, dossard, current_ts):
    log_debug(f"[get_last_valid_lecture_time] tp={tp_id} dossard={dossard} current={current_ts}")
    cur.execute(f"""
        SELECT timestamp_read, tour
        FROM `{detail_table}`
        WHERE tp_id = %s
        AND cla_info_dossard = %s
        AND status = 1
        AND timestamp_read < %s
        ORDER BY timestamp_read DESC
        LIMIT 1
    """, (tp_id, dossard, current_ts))
 
    row = cur.fetchone()
    log_debug(f"[get_last_valid_lecture_time] result={row}")

    if not row:
        return None, None

    return (
        Decimal(str(row["timestamp_read"])),
        row["tour"]
    )


# -------------------------------------------------
#  Conversion d'un timestamp Decimal en datetime UTC
# -------------------------------------------------
def ts_to_utc(ts):
    ts = Decimal(str(ts))
    seconds = int(ts)
    micro = int((ts - Decimal(seconds)) * Decimal(1_000_000))
    return datetime.fromtimestamp(seconds, tz=timezone.utc).replace(microsecond=micro)

# -------------------------------------------------
#  Recherche du dernier tour pour un coureur à un TP
# -------------------------------------------------
#def compute_tour(cur, detail_table, tp_id, dossard):
def check_tour_rule(
                cur,
                detail_table,
                tp_id,
                dossard,
                timestamp,
                det_id
                    
            ):


    last_timestamp, last_tour = get_last_valid_lecture_time(
    cur, detail_table, tp_id, dossard, timestamp
    )
 
    if last_tour is None:
        last_tour=0
 
    if last_timestamp is None:
        last_timestamp = Decimal("0")
       
    tour=last_tour+1;   
    tempstour = timestamp - last_timestamp
    tempstour_str = format_temps_decimal(tempstour)

    return tour, tempstour,tempstour_str


def update_detail(
    cur,
    cnx,
    detail_table,
    detail_id,
    tour,
    tempstour,
    tempstour_str
):
    cur.execute(f"""
        UPDATE `{detail_table}`
        SET tour = %s,
            tempstour = %s,
            tempstour_str = %s,
            reason_code = NULL,
            reason_ref_id = NULL
        WHERE detail_id = %s
    """, (
        tour,
        tempstour,
        tempstour_str,
        detail_id
    ))

    cnx.commit()


def update_detail_status_zero(cur, cnx, detail_table, detail_id, reason_code, reason_ref_id):
    """
    Met à jour un enregistrement Detail existant pour le passer en status=0,
    avec reason_code et reason_ref_id.
    """
    cur.execute(f"""
        UPDATE `{detail_table}`
        SET status = 0,
            reason_code = %s,
            reason_ref_id = %s
        WHERE detail_id = %s
    """, (reason_code, reason_ref_id, detail_id))

    cnx.commit()