import { DescriptorBuilder } from "./DescriptorBuilder";
import { ConfigurableKeys, ContainerServices, ConfigurableServices, RegistrationBuildersMap, ExtractRequired } from "./interfaces";
import { ServiceContainer } from "./interfaces";
import { argumentNotNull, each, isKey } from "./traits";

export class FluentConfiguration<S extends object, Y extends ConfigurableKeys<S> = ConfigurableKeys<S>> {

    private _builders: Partial<RegistrationBuildersMap<S>> = {};

    /** Adds a declaration of the services to the current config.
     * 
     * @template D The map of the services
     * @returns self
     */
    declare<D extends Partial<Pick<S, keyof D & keyof S>>>(): FluentConfiguration<S & D, Y | ConfigurableKeys<D>> {
        return this as FluentConfiguration<S & D, Y | ConfigurableKeys<D>>;
    }

    /** Adds compile-time information about the already provided services
     * 
     * @template P The map of the provided services
     * @returns self
     */
    provided<P extends Pick<S, keyof P & keyof S>>(): FluentConfiguration<S & P, Exclude<Y, keyof P>> {
        return this as FluentConfiguration<S & P, Exclude<Y, keyof P>>;
    }

    /** Register the service.
     * 
     * @param name The name of the service
     * @param builder The service builder
     * @returns self
     */
    register<K extends Y>(name: K, builder: RegistrationBuildersMap<S>[K]): FluentConfiguration<S, Exclude<Y, K>>;
    /** Registers the collection of services
     * @param config The collection of services to register.
     * @returns self
     */
    register<K extends Y>(config: RegistrationBuildersMap<S, K>): FluentConfiguration<S, Exclude<Y, K>>;
    register<K extends Y>(nameOrConfig: K | RegistrationBuildersMap<S, K>, builder?: RegistrationBuildersMap<S>[K]) {
        if (isKey(nameOrConfig)) {
            argumentNotNull(builder, "builder");
            this._builders[nameOrConfig] = builder;
        } else {
            each(nameOrConfig, (v, k) => this.register(k, v));
        }

        return this as FluentConfiguration<S, Exclude<Y, K>>;
    }

    /**
     * This method is used to enable a compile time check of the configuration.
     * If there are not configured services in the configuration the compiler
     * will trigger the error.
     * 
     * @param missing Empty object literal should always be specified.
     * @returns self
     */
    // eslint-disable-next-line @typescript-eslint/no-unused-vars
    done<M extends ExtractRequired<S,Y>>(missing: M) {
        return this;
    }


    apply<A extends Partial<S>>(target: ServiceContainer<A>) {

        let pending = 1;

        const _t2 = target as ServiceContainer<S>;

        const reject = (ex: unknown) => { throw ex; };

        const complete = () => !--pending;

        each(this._builders, (v, k) => {
            pending++;
            const d = new DescriptorBuilder<ContainerServices<S>, NonNullable<ConfigurableServices<S>[typeof k]>>(_t2,
                result => {
                    _t2.register(k, result);
                    complete();
                },
                reject
            );


            v(d);
        });
        if (!complete())
            throw new Error("The configuration didn't complete.");

        return _t2 as ServiceContainer<A & S>;
    }

}