from typing import Type

from cpl_core.database.context import DatabaseContextABC
from cpl_core.dependency_injection import ServiceProviderABC
from cpl_core.logging import LoggerABC

from gismo_data.abc.migration_abc import MigrationABC
from gismo_data.model.migration_history import MigrationHistory


class MigrationService:

    def __init__(self, logger: LoggerABC, services: ServiceProviderABC, db: DatabaseContextABC):
        self._logger = logger
        self._services = services
        
        self._db = db
        self._cursor = db.cursor

        self._migrations: list[Type[MigrationABC]] = MigrationABC.__subclasses__()
    
    def migrate(self):
        self._logger.info(__name__, f"Running Migrations")
        for migration in self._migrations:
            migration_id = migration.__name__
            try:
                # check if table exists
                self._cursor.execute("SHOW TABLES LIKE 'MigrationHistory'")
                result = self._cursor.fetchone()
                if result:
                    # there is a table named "tableName"
                    self._logger.trace(__name__, f"Running SQL Command: {MigrationHistory.get_select_by_id_string(migration_id)}")
                    migration_from_db = self._db.select(MigrationHistory.get_select_by_id_string(migration_id))
                    self._logger.trace(__name__, str(migration_from_db))
                    if migration_from_db is not None and len(migration_from_db) > 0:
                        continue
                
                self._logger.debug(__name__, f"Running Migration {migration}")
                migration_as_service: MigrationABC = self._services.get_service(migration)
                migration_as_service.upgrade()
                self._cursor.execute(MigrationHistory(migration_id).insert_string)
                self._db.save_changes()

            except Exception as e:
                self._logger.error(__name__, f'Cannot get migration with id {migration}', e)