import os
import yaml
import shutil
from pathlib import Path
import uuid
from datetime import datetime
try:
    import tomllib
except ModuleNotFoundError:  # Py<3.11
    import tomli as tomllib
import streamlit as st

from databases import set_db_path, init_schema, set_blockchain_enabled
from api_client import APIClient
from utils import ensure_dirs
from auth import initialize_auth_system, render_login_form, render_sidebar, require_login
from persistent_data_gate import ensure_temp_databases, maybe_publish_monthly_actions_digest
from mobile_verification import render_mobile_verification_screen, get_user_permissions
from compliance_client import compliance_client
from page_modules.new_video_processing import render_process_video_page
from page_modules.analyze_audiodescriptions import render_analyze_audiodescriptions_page
from page_modules.statistics import render_statistics_page
from page_modules.validation import render_validation_page
from page_modules.machine_room import render_machine_room_page


# -- Move DB / vídeos en entorns de desplegament --
os.environ["STREAMLIT_DATA_DIRECTORY"] = "/tmp/.streamlit"
Path("/tmp/.streamlit").mkdir(parents=True, exist_ok=True)

# Vídeos estàtics: prioritzar demo/data/media, caure a demo/videos si cal.
# Es copien a /tmp/data/videos només per a entorns de desplegament; la BD
# principal d'usuaris es fa servir directament des de DATA_DIR/users.db.
runtime_videos = Path("/tmp/data/videos")
if not runtime_videos.exists():
    Path("/tmp/data").mkdir(parents=True, exist_ok=True)
    base_dir = Path(__file__).parent
    candidates = [
        base_dir / "data" / "media",  # nova ubicació
        base_dir / "videos",           # compatibilitat enrere
    ]

    static_videos = None
    for cand in candidates:
        if cand.exists():
            static_videos = cand
            break

    if static_videos is not None:
        shutil.copytree(static_videos, runtime_videos, dirs_exist_ok=True)


# --- Config ---
def _load_yaml(path="config.yaml") -> dict:
    with open(path, "r", encoding="utf-8") as f:
        cfg = yaml.safe_load(f) or {}
    # interpolación sencilla de ${VARS} si las usas en el YAML
    def _subst(s: str) -> str:
        return os.path.expandvars(s) if isinstance(s, str) else s

    # aplica sustitución en los campos que te interesan
    if "api" in cfg:
        cfg["api"]["base_url"] = _subst(cfg["api"].get("base_url", ""))
        cfg["api"]["token"]    = _subst(cfg["api"].get("token", ""))
        cfg["api"]["tts_url"]  = _subst(cfg["api"].get("tts_url", ""))

    if "storage" in cfg and "root_dir" in cfg["storage"]:
        cfg["storage"]["root_dir"] = _subst(cfg["storage"]["root_dir"])

    if "sqlite" in cfg and "path" in cfg["sqlite"]:
        cfg["sqlite"]["path"] = _subst(cfg["sqlite"]["path"])

    return cfg

CFG = _load_yaml("config.yaml")

# Ajuste de variables según tu esquema YAML
# Para la interfaz demo, usaremos sempre la carpeta "temp" local
DATA_DIR = "temp"

# Backend del engine: primero config.yaml, luego variable de entorno, luego fallback local
BACKEND_BASE_URL = (
    CFG.get("api", {}).get("base_url")
    or os.getenv("API_BASE_URL")
    or "http://localhost:8000"
)

TTS_URL = "https://veureu-tts.hf.space"
USE_MOCK = bool(CFG.get("app", {}).get("use_mock", False))  # si no la tienes en el yaml, queda False

COMPLIANCE_CFG = CFG.get("compliance", {}) or {}
PRIVATE_BLOCKCHAIN_ENABLE = bool(
    COMPLIANCE_CFG.get("private_blockchain_enabled",
                       COMPLIANCE_CFG.get("private_blockchain_enable", False))
)
PUBLIC_BLOCKCHAIN_ENABLE = bool(
    COMPLIANCE_CFG.get("public_blockchain_enabled",
                       COMPLIANCE_CFG.get("public_blockchain_enable", False))
)
MONTHLY_DIGEST_ENABLED = bool(COMPLIANCE_CFG.get("monthly_digest_enabled", False))

# Token compartido: primero config.yaml (api.token), luego variable de entorno VEUREU_TOKEN
API_TOKEN = CFG.get("api", {}).get("token") or os.getenv("VEUREU_TOKEN")

# Cliente del backend (engine)
api = APIClient(BACKEND_BASE_URL, use_mock=USE_MOCK, data_dir=DATA_DIR, token=API_TOKEN, tts_url=TTS_URL)

os.makedirs(DATA_DIR, exist_ok=True)
ensure_dirs(DATA_DIR)

base_dir = Path(__file__).parent
ensure_temp_databases(base_dir, api)

DB_PATH = os.path.join(DATA_DIR, "db", "users.db")
set_db_path(DB_PATH)

# Configurar si els esdeveniments s'han de registrar a SQLite o a AWS QLDB
set_blockchain_enabled(PRIVATE_BLOCKCHAIN_ENABLE)

# Si està habilitat el registre públic i el digest mensual, publicar si cal
# el digest mensual sobre actions.db (es calcula al voltant del mes anterior).
maybe_publish_monthly_actions_digest(
    base_dir,
    compliance_client,
    public_blockchain_enabled=PUBLIC_BLOCKCHAIN_ENABLE,
    monthly_digest_enabled=MONTHLY_DIGEST_ENABLED,
)

init_schema()

# Initialize authentication system and sync default users
initialize_auth_system(DB_PATH)

# Identificador de sessió per a traça d'esdeveniments
if "session_id" not in st.session_state:
    st.session_state.session_id = str(uuid.uuid4())

# Exposar client d'API al session_state per a altres mòduls (p.ex. auth/persistent_data_gate)
st.session_state.api_client = api

st.set_page_config(page_title="Veureu — Audiodescripció", page_icon="🎬", layout="wide")

# Estil global: botons primaris en taronja (en lloc de blau per defecte)
st.markdown(
    """
    <style>
    .stButton > button[kind="primary"] {
        background-color: #f97316;
        border-color: #ea580c;
        color: white;
    }
    .stButton > button[kind="primary"]:hover {
        background-color: #ea580c;
        border-color: #c2410c;
    }
    </style>
    """,
    unsafe_allow_html=True,
)

# Initialize session state for user
if "user" not in st.session_state:
    st.session_state.user = None

# Render sidebar and get navigation
page, role = render_sidebar()

# Pre-login screen
if not st.session_state.user:
    st.title("Veureu — Audiodescripció")
    render_login_form()
    st.stop()

# Post-login: Verificación por móvil si es necesaria
if st.session_state.user and 'sms_verified' not in st.session_state:
    st.session_state.sms_verified = None

permissions = None
if st.session_state.user:
    username = st.session_state.user['username']
    role = st.session_state.user['role']
    
    # Obtener permisos para ver si requiere SMS
    permissions = get_user_permissions(role, st.session_state.get('sms_verified'))
    
    # Si requiere SMS y aún no está verificado/omitido, mostrar pantalla de verificación
    if permissions["requires_sms"] and st.session_state.sms_verified is None:
        result = render_mobile_verification_screen(username, role)
        if result is None:
            # Aún en proceso de verificación
            st.stop()
        # Si result es True o False, ya se ha completado/omitido y continúa

# --- Pages ---
if page == "Processar vídeo nou":
    require_login(render_login_form)
    
    permissions = get_user_permissions(role, st.session_state.get('sms_verified'))
    if not permissions["procesar_videos"]:
        st.error("No tens permisos per processar nous vídeos. Verifica el teu mòbil per obtenir accés complet.")
        st.stop()

    render_process_video_page(api, BACKEND_BASE_URL)

elif page == "Analitzar audiodescripcions":
    require_login(render_login_form)
    permissions = get_user_permissions(role, st.session_state.get('sms_verified'))
    render_analyze_audiodescriptions_page(api, permissions)

elif page == "Estadístiques":
    require_login(render_login_form)
    render_statistics_page()

elif page == "Validació":
    require_login(render_login_form)
    permissions = get_user_permissions(role, st.session_state.get('sms_verified'))
    render_validation_page(compliance_client, runtime_videos, permissions, username)

elif page == "Sala de màquines":
    require_login(render_login_form)
    # Només l'usuari 'verd' pot accedir a aquesta pantalla
    if st.session_state.user and st.session_state.user.get("username") == "verd":
        render_machine_room_page()
    else:
        st.error("No tens permisos per accedir a aquesta pantalla.")