import json
import logging
import shutil
import uuid
from pathlib import Path

from backend.config import RACINE, DOSSIER_CADRES, FORMATS_CADRES, charger_config, mettre_a_jour_config

log = logging.getLogger("photobooth.evenements")

DOSSIER_EVENEMENTS = RACINE / "data" / "evenements"
DOSSIER_EVENEMENTS.mkdir(parents=True, exist_ok=True)


def _chemin_event(event_id: str) -> Path:
    return DOSSIER_EVENEMENTS / f"{event_id}.json"


def _chemin_cadres_event(event_id: str) -> Path:
    d = DOSSIER_EVENEMENTS / event_id / "cadres"
    d.mkdir(parents=True, exist_ok=True)
    return d


def lister_evenements() -> list[dict]:
    events = []
    config = charger_config()
    actif_id = config.get("evenement", {}).get("event_id")
    for f in sorted(DOSSIER_EVENEMENTS.glob("*.json")):
        try:
            data = json.loads(f.read_text("utf-8"))
            data["actif"] = (data.get("id") == actif_id)
            events.append(data)
        except (json.JSONDecodeError, KeyError):
            continue
    return events


def creer_evenement(nom: str, **kwargs) -> dict:
    event_id = uuid.uuid4().hex[:8]
    event = {
        "id": event_id,
        "nom": nom,
        "theme": kwargs.get("theme", "base"),
        "couleur_primaire": kwargs.get("couleur_primaire", "#e91e63"),
        "couleur_secondaire": kwargs.get("couleur_secondaire", "#ffffff"),
        "media_accueil": kwargs.get("media_accueil"),
        "formats_actifs": kwargs.get("formats_actifs", ["10x15", "15x20", "strip"]),
        "cadres": {},
    }
    _chemin_event(event_id).write_text(json.dumps(event, ensure_ascii=False, indent=2), "utf-8")
    log.info(f"Evenement cree : {nom} ({event_id})")
    return event


def obtenir_evenement(event_id: str) -> dict | None:
    chemin = _chemin_event(event_id)
    if not chemin.exists():
        return None
    return json.loads(chemin.read_text("utf-8"))


def modifier_evenement(event_id: str, modifications: dict) -> dict | None:
    event = obtenir_evenement(event_id)
    if not event:
        return None
    for k, v in modifications.items():
        if k != "id":
            event[k] = v
    _chemin_event(event_id).write_text(json.dumps(event, ensure_ascii=False, indent=2), "utf-8")
    return event


def supprimer_evenement(event_id: str) -> bool:
    chemin = _chemin_event(event_id)
    if not chemin.exists():
        return False
    chemin.unlink()
    dossier_cadres = DOSSIER_EVENEMENTS / event_id
    if dossier_cadres.exists():
        shutil.rmtree(dossier_cadres)
    config = charger_config()
    if config.get("evenement", {}).get("event_id") == event_id:
        mettre_a_jour_config({"evenement": {"event_id": None}})
    log.info(f"Evenement supprime : {event_id}")
    return True


def activer_evenement(event_id: str) -> dict | None:
    event = obtenir_evenement(event_id)
    if not event:
        return None
    mettre_a_jour_config({
        "evenement": {
            "event_id": event_id,
            "nom": event["nom"],
            "theme": event.get("theme", "base"),
            "couleur_primaire": event.get("couleur_primaire", "#e91e63"),
            "couleur_secondaire": event.get("couleur_secondaire", "#ffffff"),
            "media_accueil": event.get("media_accueil"),
            "formats_actifs": event.get("formats_actifs", ["10x15", "15x20", "strip"]),
        }
    })
    log.info(f"Evenement active : {event['nom']} ({event_id})")
    return event


def lister_cadres_event(event_id: str, format_papier: str) -> list[str]:
    dossier = _chemin_cadres_event(event_id) / format_papier
    if not dossier.exists():
        return []
    return sorted(f.name for f in dossier.iterdir() if f.suffix.lower() == ".png")


def config_cadre_event(event_id: str) -> dict:
    """Retourne la config cadres de l'evenement : {format: {mode, cadre}}
    mode: 'disponible' (choix user), 'impose' (force), 'defaut' (pre-selectionne)
    """
    event = obtenir_evenement(event_id)
    if not event:
        return {}
    return event.get("cadres", {})


def set_cadre_event(event_id: str, format_papier: str, mode: str, cadre: str | None) -> bool:
    """mode: 'aucun', 'disponible', 'impose', 'defaut'"""
    event = obtenir_evenement(event_id)
    if not event:
        return False
    if "cadres" not in event:
        event["cadres"] = {}
    event["cadres"][format_papier] = {"mode": mode, "cadre": cadre}
    _chemin_event(event_id).write_text(json.dumps(event, ensure_ascii=False, indent=2), "utf-8")
    return True


def cadre_actif_pour_impression(format_papier: str) -> tuple[str | None, str]:
    """Retourne (nom_cadre, mode) en tenant compte de l'evenement actif.
    mode: 'aucun', 'disponible', 'impose', 'defaut'
    Strips exclus du cadre impose/defaut.
    """
    if format_papier == "strip":
        return None, "aucun"
    config = charger_config()
    event_id = config.get("evenement", {}).get("event_id")
    if not event_id:
        return None, "aucun"
    event = obtenir_evenement(event_id)
    if not event:
        return None, "aucun"
    cadres = event.get("cadres", {})
    fmt_conf = cadres.get(format_papier, {})
    return fmt_conf.get("cadre"), fmt_conf.get("mode", "aucun")