import { $NAME, MetaContext } from '../../MetaContext';

export const $INTERPOLATE = '$interpolate';

export type Interpolate<T> = (from: T, to: T, progress: number) => T;

export type $Interpolate<T> = { [$INTERPOLATE]: Interpolate<T> };

export type InterpolateNumber = { interpolateNumber(from: number, to: number, progress: number): number };

export const withInterpolate = <TMetaContextBase extends new (...args: any[]) => MetaContext>(MetaContextBase: TMetaContextBase) => class extends MetaContextBase {
    [$INTERPOLATE]<T>(from: T, to: T, progress: number) {
        const $from = this.resolveValue(from);
        const $to = this.resolveValue(to);
        if ($from !== $to)
            throw new TypeError(`MetaContext.${$INTERPOLATE}(): type missmatch '${$from[$NAME]}' !== '${$to[$NAME]}'`);
        return $from[$INTERPOLATE](from, to, progress, this) as T;
    }
};