"""
Migration script to add episode_ordering field to the podcasts table.
"""
import sqlite3
import os
from flask import current_app

def run_migration():
    """
    Run the migration to add the episode_ordering field to the podcasts table.
    """
    # Get the database path from the app config
    db_path = current_app.config['SQLALCHEMY_DATABASE_URI'].replace('sqlite:///', '')
    
    # Connect to the database
    conn = sqlite3.connect(db_path)
    cursor = conn.cursor()
    
    # Check if the episode_ordering column already exists in the podcasts table
    cursor.execute("PRAGMA table_info(podcasts)")
    columns = [column[1] for column in cursor.fetchall()]
    
    # Add the episode_ordering column if it doesn't exist
    if 'episode_ordering' not in columns:
        print("Adding 'episode_ordering' column to podcasts table...")
        cursor.execute("ALTER TABLE podcasts ADD COLUMN episode_ordering TEXT DEFAULT 'absolute'")
    
    # Commit the changes and close the connection
    conn.commit()
    conn.close()
    
    print("Episode ordering migration completed successfully!")
    return True