"""
Skill : DELEGATE
Délègue une tâche à un agent spécialisé via MQTT et attend sa réponse.
Log le résultat et notifie agent1 en cas d'erreur.
Vérifie les plages horaires (work_hours) et le blackout avant délégation.

Commande :
    DELEGATE: <agent_name> | <tâche>
"""
import json
import time
import threading
from datetime import datetime
from pathlib import Path
import paho.mqtt.client as mqtt

SKILL_NAME = "delegate"
TRIGGER    = "DELEGATE:"

CONFIG_FILE    = Path("/opt/agent/config/config.json")
REGISTRY_FILE  = Path("/opt/agent/config/agents_registry.json")
BLACKOUT_FILE  = Path("/opt/agent/config/blackout_hours.json")
TIMEOUT        = 120

ERROR_KEYWORDS = ["erreur", "error", "timeout", "échec", "failed", "cannot", "permission denied",
                  "command not found", "no such file", "connexion refusée"]

def _load():
    cfg      = json.loads(CONFIG_FILE.read_text())
    registry = json.loads(REGISTRY_FILE.read_text())
    return cfg, registry

def _is_error(result: str) -> bool:
    lower = result.lower()
    if "[erreur" in lower or "exit code" in lower:
        return True
    return any(kw in lower for kw in ERROR_KEYWORDS)

def _check_availability(agent_name: str, registry: dict) -> tuple:
    """Retourne (disponible: bool, message: str)."""
    now = datetime.now()

    # Vérifier blackout_hours.json
    try:
        blackouts = json.loads(BLACKOUT_FILE.read_text())
        for b in blackouts:
            if not b.get("enabled", True):
                continue
            start = datetime.strptime(b["start"], "%H:%M").replace(
                year=now.year, month=now.month, day=now.day)
            end = datetime.strptime(b["end"], "%H:%M").replace(
                year=now.year, month=now.month, day=now.day)
            if start <= now <= end:
                return False, "Blackout actif ({}) : {}-{}. Tâche non exécutée.".format(
                    b.get("label", "maintenance"), b["start"], b["end"])
    except Exception:
        pass

    # Vérifier work_hours de l'agent
    agent = registry.get(agent_name, {})
    wh = agent.get("work_hours")
    if wh and wh.get("enabled", True):
        start_str = wh.get("start", "00:00")
        end_str   = wh.get("end",   "23:59")
        start = datetime.strptime(start_str, "%H:%M").replace(
            year=now.year, month=now.month, day=now.day)
        end = datetime.strptime(end_str, "%H:%M").replace(
            year=now.year, month=now.month, day=now.day)

        # Vérifier le jour
        days = wh.get("days")
        if days:
            day_map = ["mon","tue","wed","thu","fri","sat","sun"]
            if day_map[now.weekday()] not in days:
                return False, "Agent {} ne travaille pas ce jour. Jours actifs : {}.".format(
                    agent_name, ", ".join(days))

        if not (start <= now <= end):
            return False, "Agent {} hors plage horaire ({}-{}).".format(
                agent_name, start_str, end_str)

    return True, ""

def _notify_error(host: str, port: int, agent: str, task: str, result: str):
    """Publie l'erreur sur le topic d'erreurs pour que agent1 notifie l'utilisateur."""
    try:
        payload = json.dumps({
            "agent"  : agent,
            "task"   : task[:200],
            "error"  : result[:500],
            "source" : "delegate"
        })
        pub = mqtt.Client(mqtt.CallbackAPIVersion.VERSION2, client_id="delegate_err_pub")
        pub.connect(host, port)
        pub.publish("agents/errors", payload)
        pub.disconnect()
    except Exception:
        pass

def execute(args: str) -> str:
    if "|" not in args:
        return "Erreur : format attendu → DELEGATE: <agent> | <tâche>"

    agent_name, _, task = args.partition("|")
    agent_name, task = agent_name.strip(), task.strip()

    cfg, registry = _load()
    if agent_name not in registry:
        available = ", ".join(registry.keys())
        return "Agent inconnu : «{}». Agents disponibles : {}".format(agent_name, available)

    # Vérifier disponibilité (plages horaires + blackout)
    available, reason = _check_availability(agent_name, registry)
    if not available:
        print("[DELEGATE] {} indisponible : {}".format(agent_name, reason))
        return "[INDISPONIBLE] {} : {}".format(agent_name, reason)

    agent  = registry[agent_name]
    inbox  = agent["mqtt_inbox"]
    outbox = agent["mqtt_outbox"]
    host   = cfg.get("mqtt_host", "localhost")
    port   = int(cfg.get("mqtt_port", 1883))

    response_received  = threading.Event()
    response_container = []

    def on_message(client, userdata, msg):
        response_container.append(msg.payload.decode(errors="replace"))
        response_received.set()

    sub = mqtt.Client(mqtt.CallbackAPIVersion.VERSION2, client_id="agent1_delegate_sub")
    sub.on_message = on_message
    sub.connect(host, port)
    sub.subscribe(outbox)
    sub.loop_start()

    pub = mqtt.Client(mqtt.CallbackAPIVersion.VERSION2, client_id="agent1_delegate_pub")
    pub.connect(host, port)
    pub.publish(inbox, task)
    pub.disconnect()

    print("[DELEGATE] Tâche envoyée à {} : {}".format(agent_name, task[:80]))

    start    = time.time()
    received = response_received.wait(timeout=TIMEOUT)
    duration = time.time() - start

    sub.loop_stop()
    sub.disconnect()

    from skills.reporting import log_execution

    if received and response_container:
        result = response_container[0]
        status = "error" if _is_error(result) else "success"
        log_execution("delegate", agent_name, task, status, result, duration)

        if status == "error":
            _notify_error(host, port, agent_name, task, result)
            print("[DELEGATE] Erreur détectée dans la réponse de {}".format(agent_name))

        return "[{}] {}".format(agent_name, result)

    # Timeout
    timeout_msg = "Timeout : {} n'a pas répondu dans les {}s.".format(agent_name, TIMEOUT)
    log_execution("delegate", agent_name, task, "timeout", timeout_msg, duration)
    _notify_error(host, port, agent_name, task, timeout_msg)
    return timeout_msg