import streamlit as st
from playlists import playlist_db
from playlists.playlist_model import Playlist, RuleSet
from playlists.playlist_controller import playlist_manual_editor, playlist_dynamic_editor
from datetime import datetime
from cache.video_summary import rebuild_video_summary

def main():
    st.title("🎵 Gestion des Playlists")
    if st.button("🔁 Recalculer le cache vidéo"):
        rebuild_video_summary()
        st.success("Cache mis à jour !")

    # --- Barre latérale : recherche & filtres ---
    st.sidebar.header("🔎 Recherche de playlists")
    search_term = st.sidebar.text_input("Filtrer par nom ou description")
    date_filter = st.sidebar.date_input("Créées après", value=None)

    playlists = playlist_db.load_all_playlists()

    # Appliquer les filtres
    filtered = []
    for p in playlists:
        # filtrage texte
        if search_term.lower() not in p.name.lower() and search_term.lower() not in (p.description or "").lower():
            continue
        # filtrage date de création
        if date_filter:
            created = p.created_at
            if isinstance(created, datetime):
                created_dt = created
            elif isinstance(created, (str, bytes)):
                try:
                    created_dt = datetime.fromisoformat(created)
                except ValueError:
                    continue  # ignore invalid date
            else:
                continue

            if created_dt < datetime.combine(date_filter, datetime.min.time()):
                continue

        filtered.append(p)

    # --- Sélection ou création ---
    names = ["(➕ Nouvelle playlist)"] + [p.name for p in filtered]
    if "new_playlist_name" in st.session_state:
        st.session_state["playlist_select"] = st.session_state.pop("new_playlist_name")
    selected_name = st.selectbox("Sélectionnez une playlist", names, key="playlist_select")

    # --- Création ---
    if selected_name == "(➕ Nouvelle playlist)":
        st.subheader("Créer une nouvelle playlist")
        name = st.text_input("Nom")
        desc = st.text_area("Description")
        type_choice = st.radio("Type", ["manual", "dynamic"])
        if st.button("Créer"):
            if not name.strip():
                st.error("Le nom ne peut pas être vide.")
            else:
                pl = Playlist(name=name.strip(), description=desc, type=type_choice, rules=RuleSet())
                pl.save()
                st.session_state["new_playlist_name"] = pl.name  # on stocke temporairement
                st.rerun()
        return

    # --- Mode édition ---
    current = next((p for p in playlists if p.name == selected_name), None)
    if not current:
        st.warning("Aucune playlist sélectionnée.")
        return

    # --- Barre d’actions ---
    st.subheader(f"🎞️ Playlist : {current.name}")
    new_name = st.text_input("Renommer", value=current.name)
    new_desc = st.text_area("Description", value=current.description or "")
    if st.button("💾 Sauvegarder les métadonnées"):
        current.name = new_name
        current.description = new_desc
        current.save()
        st.success("Mise à jour enregistrée ✅")
        if hasattr(st, "rerun"):
            st.rerun()
        else:
            st.experimental_rerun()

    col1, col2, col3 = st.columns([1, 1, 2])
    with col1:
        if st.button("🗑️ Supprimer"):
            playlist_db.delete_playlist(current.id)
            st.success("Playlist supprimée ✅")
            if hasattr(st, "rerun"):
                st.rerun()
            else:
                st.experimental_rerun()
    with col2:
        if st.button("⏪ Retour à la liste"):
            st.session_state.pop("playlist_select", None)
            st.rerun()

    st.divider()

    # --- Éditeur selon le type ---
    if current.type == "manual":
        playlist_manual_editor(current)
    else:
        playlist_dynamic_editor(current)