import {Inject, Injectable} from '../di'
import {ConstraintType, DatabaseService, FieldType, Migration, Schema} from '../orm'

/**
 * Migration that creates the sessions table used by the ORMSession backend.
 */
@Injectable()
export default class CreateSessionsTableMigration extends Migration {
    @Inject()
    protected readonly db!: DatabaseService

    async up(): Promise<void> {
        const schema: Schema = this.db.get().schema()
        const table = await schema.table('sessions')

        table.primaryKey('session_uuid', FieldType.varchar)
            .required()

        table.column('session_data')
            .type(FieldType.json)
            .required()
            .default('{}')

        table.constraint('session_uuid_ck')
            .type(ConstraintType.Check)
            .expression('LENGTH(session_uuid) > 0')

        await schema.commit(table)
    }

    async down(): Promise<void> {
        const schema: Schema = this.db.get().schema()
        const table = await schema.table('sessions')

        table.dropIfExists()

        await schema.commit(table)
    }
}