import {Model} from '../Model'

/**
 * Decorator for relation methods on a Model implementation.
 * Caches the relation instances between uses for the life of the model.
 * @constructor
 */
export function Related(): MethodDecorator {
    return (target, propertyKey, descriptor) => {
        // eslint-disable-next-line @typescript-eslint/ban-ts-comment
        // @ts-ignore
        const original = descriptor.value

        // eslint-disable-next-line @typescript-eslint/ban-ts-comment
        // @ts-ignore
        descriptor.value = function(...args) {
            const model = this as Model<any>
            const cache = model.relationCache

            const existing = cache.firstWhere('accessor', '=', propertyKey)
            if ( existing ) {
                return existing.relation
            }

            // eslint-disable-next-line @typescript-eslint/ban-ts-comment
            // @ts-ignore
            const value = original.apply(this, args)

            cache.push({
                accessor: propertyKey,
                relation: value,
            })

            return value
        }
    }
}