import { Resource, ResourceNameType, ResourceIdType } from "@ray-lab/renderer-virtual";

/**
 * Resource processing tools.
 * Whenever a new resource setting is received,
 * an instance of this class will be instantiated to manage the received resource.
 * @typeParam ResourceOption - Resource option type.
 */
abstract class ResourceHandler<ResourceOption extends Resource = Resource> {

    /**
     * Resource type enumeration.
     */
    public static resourceType: ResourceNameType;
    public static resourceTypeAlias: ResourceNameType;

    /**
     * Original resource option.
     */
    public resourceOption: ResourceOption;

    /**
     * Resource unique number.
     */
    public resourceId: ResourceIdType;

    /**
     * @param resourceOption - Resource option.
     */
    public constructor(resourceOption: ResourceOption) {
        this.resourceOption = resourceOption;
        this.resourceId = resourceOption.id ?? Symbol(resourceOption.type);
    }

    /**
     * Resource initialization lifecycle.
     * It will be called once after `WebGLState` is ready.
     */
    public abstract setup(): any;

    /**
     * Marks whether the instance is destroyed.
     */
    public isDestroyed: boolean = false;

    /**
     * Resource destruction lifecycle.
     * Will be called when the resource is destroyed.
     */
    public abstract destroy(): any;

    /**
     * Resource Settings Update Lifecycle.
     * Called when the resource settings will to be updated.
     * At this time, you can access the old settings through `this.resourceOption`.
     * 
     * Note:
     * You don't need to execute ```this.resourceOption = newResourceOption``` manually,
     * The assignment will be done after this function returns.
     * @param newResourceOption - New resource option.
     */
    public abstract update(newResourceOption: ResourceOption): any;
}