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# main.py
from connections.source_connections import connect_to_source_database
from connections.target_connections import connect_to_target_database
from extraction.source_extraction import extract_data_from_source_database
from transformation.data_transformation import transform_data
from loading.target_loading import load_data_into_target_database
from logging.logging import log_migration_progress
from error_handling.error_handling import handle_error
from validation.data_validation import validate_data

def main():
    # Establish connections to source and target databases
    source_engine = connect_to_source_database("source_db_connection_string")
    target_engines = [connect_to_target_database(conn_string) for conn_string in target_db_connection_strings]

    # Define SQL queries for data extraction and loading
    source_extraction_query = "SELECT * FROM source_table"
    target_insert_query = "INSERT INTO target_table (column1, column2) VALUES (%s, %s)"  # Example insert query

    # Extract data from source database
    try:
        source_data = extract_data_from_source_database(source_engine, source_extraction_query)
    except Exception as e:
        handle_error(e)
        return

    # Transform data if needed
    transformed_data = transform_data(source_data)

    # Validate data if needed
    if not validate_data(transformed_data):
        log_migration_progress("Validation failed. Aborting data migration.")
        return

    # Load data into target databases
    for target_engine in target_engines:
        try:
            load_data_into_target_database(target_engine, transformed_data, target_insert_query)
        except Exception as e:
            handle_error(e)
            return

    log_migration_progress("Data migration completed successfully.")

if __name__ == "__main__":
    main()
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