"""Module to check for the database with unified backend support."""

import os
from typing import Dict, Any
import yaml

from custom_functions.database.unified_db_ops import (
    db_ops,
    get_backend_info,
    key_count,
)
from custom_functions.database.user_db import create_user_database


def get_database_config() -> Dict[str, Any]:
    """Get the database configuration from config.yaml."""
    try:
        config_path = os.path.join(os.getcwd(), "configs", "config.yaml")
        with open(config_path, "r", encoding="utf-8") as file:
            config = yaml.safe_load(file)
        return config
    except (FileNotFoundError, KeyError, yaml.YAMLError) as e:
        print(f"Warning: Could not load config.yaml: {e}")
        return {"database_type": "sqlite"}  # Default fallback


def check_for_sqlite_database() -> None:
    """Check for the SQLite database file and create if needed."""
    config = get_database_config()
    database_type = config.get("database_type", "sqlite").lower()

    # Only check for SQLite file if we're using SQLite
    if database_type == "sqlite":
        sqlite_path = os.path.join(os.getcwd(), "databases", "sql", "key_cache.db")
        if not os.path.exists(sqlite_path):
            print("SQLite database not found, creating...")
            # Ensure directory exists
            os.makedirs(os.path.dirname(sqlite_path), exist_ok=True)
            db_ops.create_database()
            print(f"SQLite database created at: {sqlite_path}")
        else:
            print(f"SQLite database found at: {sqlite_path}")


def check_for_mariadb_database() -> None:
    """Check for the MariaDB database and create if needed."""
    config = get_database_config()
    database_type = config.get("database_type", "sqlite").lower()

    # Only check MariaDB if we're using MariaDB
    if database_type == "mariadb":
        try:
            print("Checking MariaDB connection and creating database if needed...")
            db_ops.create_database()
            print("MariaDB database check completed successfully")
        except Exception as e:
            print(f"Error checking/creating MariaDB database: {e}")
            print("Falling back to SQLite...")
            # Fallback to SQLite if MariaDB fails
            fallback_config_path = os.path.join(os.getcwd(), "configs", "config.yaml")
            try:
                with open(fallback_config_path, "r", encoding="utf-8") as file:
                    config = yaml.safe_load(file)
                config["database_type"] = "sqlite"
                with open(fallback_config_path, "w", encoding="utf-8") as file:
                    yaml.safe_dump(config, file)
                check_for_sqlite_database()
            except Exception as fallback_error:
                print(f"Error during fallback to SQLite: {fallback_error}")


def check_for_user_database() -> None:
    """Check for the user database and create if needed."""
    user_db_path = os.path.join(os.getcwd(), "databases", "users.db")
    if not os.path.exists(user_db_path):
        print("User database not found, creating...")
        # Ensure directory exists
        os.makedirs(os.path.dirname(user_db_path), exist_ok=True)
        create_user_database()
        print(f"User database created at: {user_db_path}")
    else:
        print(f"User database found at: {user_db_path}")


def check_for_sql_database() -> None:
    """Check for the SQL database based on configuration."""
    print("=== Database Check Starting ===")

    # Get backend information
    backend_info = get_backend_info()
    print(f"Database backend: {backend_info['backend']}")
    print(f"Using module: {backend_info['module']}")

    config = get_database_config()
    database_type = config.get("database_type", "sqlite").lower()

    # Ensure databases directory exists
    os.makedirs(os.path.join(os.getcwd(), "databases"), exist_ok=True)
    os.makedirs(os.path.join(os.getcwd(), "databases", "sql"), exist_ok=True)

    # Check main database based on type
    if database_type == "mariadb":
        check_for_mariadb_database()
    else:  # Default to SQLite
        check_for_sqlite_database()

    # Always check user database (always SQLite)
    check_for_user_database()

    print("=== Database Check Completed ===")


def get_database_status() -> Dict[str, Any]:
    """Get the current database status and configuration."""
    config = get_database_config()
    backend_info = get_backend_info()

    status = {
        "configured_backend": config.get("database_type", "sqlite").lower(),
        "active_backend": backend_info["backend"],
        "module_in_use": backend_info["module"],
        "sqlite_file_exists": os.path.exists(
            os.path.join(os.getcwd(), "databases", "sql", "key_cache.db")
        ),
        "user_db_exists": os.path.exists(
            os.path.join(os.getcwd(), "databases", "users.db")
        ),
    }

    # Try to get key count to verify database is working
    try:

        status["key_count"] = key_count()
        status["database_operational"] = True
    except Exception as e:
        status["key_count"] = "Error"
        status["database_operational"] = False
        status["error"] = str(e)

    return status


def print_database_status() -> None:
    """Print a formatted database status report."""
    status = get_database_status()

    print("\n=== Database Status Report ===")
    print(f"Configured Backend: {status['configured_backend']}")
    print(f"Active Backend: {status['active_backend']}")
    print(f"Module in Use: {status['module_in_use']}")
    print(f"SQLite File Exists: {status['sqlite_file_exists']}")
    print(f"User DB Exists: {status['user_db_exists']}")
    print(f"Database Operational: {status['database_operational']}")
    print(f"Key Count: {status['key_count']}")

    if not status["database_operational"]:
        print(f"Error: {status.get('error', 'Unknown error')}")

    print("==============================\n")