# app/core/auth.py
"""
Oddiy autentifikatsiya tizimi (MVP uchun)
Session-based authentication
"""

import secrets
from typing import Optional, Dict
from datetime import datetime, timedelta
import logging

logger = logging.getLogger(__name__)

# Session storage (xotirada saqlash, MVP uchun yetarli)
active_sessions: Dict[str, Dict] = {}

# Session amal qilish muddati
SESSION_LIFETIME = timedelta(hours=12)


def create_session(dispatcher: Dict) -> str:
    """
    Dispetcher uchun sessiya yaratish
    Returns: session_token
    """
    # Tasodifiy session token yaratish
    session_token = secrets.token_urlsafe(32)
    
    # Session ma'lumotlarini saqlash
    active_sessions[session_token] = {
        "dispatcher_id": dispatcher['id'],
        "username": dispatcher['username'],
        "full_name": dispatcher['full_name'],
        "district": dispatcher['district'],
        "created_at": datetime.now(),
        "expires_at": datetime.now() + SESSION_LIFETIME
    }
    
    logger.info(f"✅ Yangi sessiya yaratildi: {dispatcher['username']}")
    return session_token


def verify_session(session_token: str) -> Optional[Dict]:
    """
    Session tokenni tekshirish
    Returns: dispatcher ma'lumotlari yoki None
    """
    session = active_sessions.get(session_token)
    
    if not session:
        return None
    
    # Session muddati tugaganligini tekshirish
    if datetime.now() > session['expires_at']:
        logger.warning(f"⚠️ Session muddati tugagan: {session['username']}")
        del active_sessions[session_token]
        return None
    
    return session


def delete_session(session_token: str) -> bool:
    """Session ni o'chirish (logout)"""
    if session_token in active_sessions:
        username = active_sessions[session_token]['username']
        del active_sessions[session_token]
        logger.info(f"✅ Session o'chirildi: {username}")
        return True
    return False


def get_active_dispatchers() -> list:
    """Hozir online bo'lgan dispetcherlar"""
    current_time = datetime.now()
    
    online_dispatchers = []
    for token, session in active_sessions.items():
        if session['expires_at'] > current_time:
            online_dispatchers.append({
                "username": session['username'],
                "full_name": session['full_name'],
                "district": session['district']
            })
    
    return online_dispatchers


# Vaqti-vaqti bilan eski sessionlarni tozalash
def cleanup_expired_sessions():
    """Muddati o'tgan sessionlarni o'chirish"""
    current_time = datetime.now()
    expired_tokens = [
        token for token, session in active_sessions.items()
        if session['expires_at'] <= current_time
    ]
    
    for token in expired_tokens:
        username = active_sessions[token]['username']
        del active_sessions[token]
        logger.info(f"🗑️ Eski session tozalandi: {username}")
    
    return len(expired_tokens)