from fastapi import APIRouter, HTTPException, Depends, Header
from pydantic import BaseModel
import os
from typing import Optional

router = APIRouter()

class AdminUpdateRequest(BaseModel):
    m3u_url: Optional[str] = None
    action: str  # "update_playlist", "clear_cache", etc.

def verify_admin_token(authorization: Optional[str] = Header(None)) -> bool:
    """Verifica si el token es de administrador"""
    if not authorization or not authorization.startswith("Bearer "):
        return False
    
    token = authorization.split(" ")[1]
    admin_code = os.getenv("ADMIN_CODE", "admin123")
    
    return token == admin_code

@router.post("/update")
async def admin_update(
    request: AdminUpdateRequest,
    is_admin: bool = Depends(verify_admin_token)
):
    """Endpoint de administración para actualizaciones"""
    
    if not is_admin:
        raise HTTPException(status_code=403, detail="Acceso denegado")
    
    try:
        if request.action == "clear_cache":
            # Limpiar caché de M3U
            from m3u_parser import m3u_cache
            m3u_cache["data"] = None
            m3u_cache["timestamp"] = None
            
            # Limpiar caché de visualizadores
            from viewers import viewers_cache, channel_viewers
            viewers_cache.clear()
            channel_viewers.clear()
            
            return {"message": "Caché limpiado correctamente"}
        
        elif request.action == "update_playlist" and request.m3u_url:
            # Actualizar URL de playlist (requiere reinicio)
            return {
                "message": "URL actualizada. Reinicia el servidor para aplicar cambios.",
                "new_url": request.m3u_url
            }
        
        else:
            raise HTTPException(status_code=400, detail="Acción no válida")
    
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Error en operación admin: {str(e)}")

@router.get("/status")
async def admin_status(is_admin: bool = Depends(verify_admin_token)):
    """Estado del sistema para administradores"""
    
    if not is_admin:
        raise HTTPException(status_code=403, detail="Acceso denegado")
    
    from m3u_parser import m3u_cache
    from viewers import viewers_cache, channel_viewers
    
    return {
        "cache_status": {
            "m3u_cached": m3u_cache["data"] is not None,
            "cache_timestamp": m3u_cache["timestamp"].isoformat() if m3u_cache["timestamp"] else None,
            "channels_count": len(m3u_cache["data"]) if m3u_cache["data"] else 0
        },
        "viewers_status": {
            "active_users": len(viewers_cache),
            "active_channels": len(channel_viewers),
            "total_viewers": sum(len(viewers) for viewers in channel_viewers.values())
        },
        "config": {
            "m3u_url_configured": bool(os.getenv("MAIN_M3U_URL")),
            "admin_code_configured": bool(os.getenv("ADMIN_CODE")),
            "base_url": os.getenv("BASE_URL", "not_configured")
        }
    }