"""Database connection - Storage Bucket with Local fallback"""
import os
from config import Config

# Storage mode: 'storage_bucket' or 'local'
STORAGE_MODE = None
_db_client = None
_db_error: str = None


def _init_storage_bucket():
    """Try to initialize Supabase Storage Bucket DB"""
    global STORAGE_MODE, _db_client, _db_error
    
    supabase_url = Config.SUPABASE_URL
    supabase_key = Config.SUPABASE_KEY
    
    if not supabase_url or not supabase_key or supabase_key == '':
        _db_error = "SUPABASE credentials not set"
        print(f"[DB] {_db_error} - falling back to local storage")
        return False
    
    try:
        from supabase import create_client
        from database.storage_bucket_db import StorageBucketDB
        
        supabase_client = create_client(supabase_url, supabase_key)
        _db_client = StorageBucketDB(supabase_client)
        STORAGE_MODE = 'storage_bucket'
        print("[DB] ✅ Using Supabase STORAGE BUCKET (analytics-data)")
        return True
    except Exception as e:
        _db_error = f"Failed to init storage bucket: {str(e)}"
        print(f"[DB ERROR] {_db_error}")
        return False


def _init_local():
    """Initialize local file storage"""
    global STORAGE_MODE, _db_client, _db_error
    
    try:
        from database.local_storage import get_local_storage
        _db_client = get_local_storage()
        STORAGE_MODE = 'local'
        print("[DB] Using LOCAL FILE STORAGE (/tmp/analytics_data)")
        return True
    except Exception as e:
        _db_error = f"Failed to init local storage: {str(e)}"
        print(f"[DB ERROR] {_db_error}")
        return False


def _init_db():
    """Initialize - tries Storage Bucket first, then local"""
    if not _init_storage_bucket():
        _init_local()


# Initialize on module load
_init_db()


def get_db():
    """Get database client"""
    if _db_client is None:
        _init_db()
    if _db_client is None:
        raise RuntimeError(f"No database: {_db_error}")
    return _db_client


def get_db_or_none():
    return _db_client


def get_db_error():
    return _db_error


def get_storage_mode():
    return STORAGE_MODE