import { ParsedMessage } from '../message_handler';
import { userDatabase } from '../../db_managers/db';
import { OperationHandler } from '../operations_base/operation_handler';
import { OperationPlugin } from '../operations_base/operation_plugin';
import { operationCodes} from "../operation_codes";

export class UserOperations implements OperationPlugin {
    public static readonly operationCodes = {
        GET_USERS: 'GET_USERS',
        CREATE_USER: 'CREATE_USER',
        MODIFY_USER: 'MODIFY_USER',
        DELETE_USER: 'DELETE_USER',
        FIND_BY_ID: 'FIND_BY_ID',
        FIND_BY_EMAIL: 'FIND_BY_EMAIL',
    };

    public static async handleGetUsers(): Promise<ParsedMessage> {
        const users = userDatabase.getAllUsers();
        return { operationCode: operationCodes.OK, metaInfo: { users } };
    }

    public static async handleGetUserById(parsedMessage: ParsedMessage): Promise<ParsedMessage> {
        const { id } = parsedMessage.metaInfo || {};
        const user = userDatabase.findById(id);
        return user
            ? { operationCode: operationCodes.OK, metaInfo: { user } }
            : { operationCode: operationCodes.ERR, metaInfo: { message: 'User not found.' } };
    }

    public static async handleModifyUser(parsedMessage: ParsedMessage): Promise<ParsedMessage> {
        const { id, name, email, password, departmentId, app_type } = parsedMessage.metaInfo || {};
        const success = userDatabase.modifyUser(id, name, email, password, departmentId, app_type);
        return success
            ? { operationCode: operationCodes.OK, metaInfo: { message: 'User modified successfully.' } }
            : { operationCode: operationCodes.ERR, metaInfo: { message: 'Failed to modify user.' } };
    }

    public register(operationHandler: OperationHandler): void {
        operationHandler.registerHandler(UserOperations.operationCodes.GET_USERS, UserOperations.handleGetUsers);
        operationHandler.registerHandler(UserOperations.operationCodes.MODIFY_USER, UserOperations.handleModifyUser);
        operationHandler.registerHandler(UserOperations.operationCodes.FIND_BY_ID, UserOperations.handleGetUserById);
    }
}