import AppClass from '../../lifecycle/AppClass.ts'
import SessionInterface from './SessionInterface.ts'

/**
 * Error thrown if a session is looked up using a key that doesn't exist.
 * @extends Error
 */
export class InvalidSessionKeyError extends Error {
    constructor(key: any) {
        super(`Invalid session key: ${key}. No session exists.`)
    }
}

/**
 * Abstract class for managing sessions.
 * @extends AppClass
 */
export default abstract class SessionManager extends AppClass {

    /**
     * Attempt to find a session by key if it exists, or create one if no key is provided.
     * @param {string} [key]
     * @return Promise<SessionInterface>
     */
    public abstract async get_session(key?: string): Promise<SessionInterface>

    /**
     * Returns true if the manager has a session with the given key.
     * @param {string} key
     * @return Promise<boolean>
     */
    public abstract async has_session(key: string): Promise<boolean>

    /**
     * Purge a session by key, if provided, or all sessions.
     * @param {string} key
     * @return Promise<void>
     */
    public abstract async purge(key?: string): Promise<void>

}