import { create, has } from '../../../core/object';
import { MetaContext, MetaObject, $NAME } from '../MetaContext';

export const $ID = '$id';

export type HashString = { hashString(str: string, seed?: number): number };

export const withId = <TMetaContextBase extends new (...args: any[]) => MetaContext & HashString>(MetaContextBase: TMetaContextBase) => class extends MetaContextBase {
    protected _ids = create<MetaObject>();

    getId(id: number) {
        return this._ids[id];
    }

    resolveId(id: number) {
        if (!has(this._ids, id))
            throw new TypeError(`MetaContext.resolveId(): ${id} is not found`);
        return this._ids[id];
    }

    protected createMetaObject(props: any) {
        const ret = super.createMetaObject(props);
        if (!has(ret, $ID))
            ret[$ID] = this.hashString(ret[$NAME]);
        const id = ret[$ID];
        if (has(this._ids, id))
            throw new TypeError(`MetaContext.register(): id ${id} is already in use for ${this.resolveId(id)[$NAME]}`);
        this._ids[id] = ret;
        return ret;
    }
};