import { $CONSTRUCTOR, MetaContext, MetaObject } from '../../MetaContext';
import { $CREATE, $Create } from './$restore';

export const $DESERIALIZE = '$deserialize';

export type Deserialize<T> = (state: any) => T;

export type $Deserialize<T> = { [$DESERIALIZE]: Deserialize<T> };

export const withDeserialize = <TMetaContextBase extends new (...args: any[]) => MetaContext & $Create<any>>(MetaContextBase: TMetaContextBase) => class extends MetaContextBase {
    getState(state: any): [MetaObject, any] {
        const $state = this.resolveValue(state);
        if ($state[$CONSTRUCTOR] === Object) {
            const keys = Object.keys(state);
            if (keys.length === 1) {
                const name = keys[0];
                const namedMetaObject = this.getName(name);
                if (namedMetaObject !== undefined)
                    return [namedMetaObject, state[name]];
            }
        }
        return [$state, state];
    }

    [$DESERIALIZE]<T>(state: any) {
        return this[$CREATE](state) as T;
    }
};