import {PurchaseUpdatePolicy} from "./enums";
import {Product} from "./Product";
import {ProductOfferDetails} from "./ProductOfferDetails";
import {PurchaseOptions} from "./PurchaseOptions";
import {PromotionalOffer} from './PromotionalOffer';

export class PurchaseOptionsBuilder {
    private offerId: string | null = null;
    private applyOffer: boolean = true;
    private oldProduct: Product | null = null;
    private updatePolicy: PurchaseUpdatePolicy | null = null;
    private contextKeys: string[] | null = null;
    private quantity: number = 1;
    private promoOffer: PromotionalOffer | null = null;

    /**
     * iOS only.
     * Set quantity of product purchasing. Use for consumable in-app products.
     * @param quantity of product purchasing.
     * @return builder instance for chain calls.
     */
    setQuantity(quantity: number): PurchaseOptionsBuilder {
        this.quantity = quantity;
        return this;
    }

    /**
     * Android only.
     * Set offer for the purchase.
     * If offer is not specified, then the default offer will be applied. To know how we choose
     * the default offer, see {@link ProductStoreDetails.defaultSubscriptionOfferDetails}.
     * @param offer concrete offer which you'd like to purchase.
     * @return builder instance for chain calls.
     */
    setOffer(offer: ProductOfferDetails) {
        this.offerId = offer.offerId;
        return this;
    }

    /**
     * Android only.
     * Set the offer Id to the purchase.
     * If {@link offerId} is not specified, then the default offer will be applied. To know how we choose
     * the default offer, see {@link ProductStoreDetails.defaultSubscriptionOfferDetails}.
     * @param offerId concrete offer Id which you'd like to purchase.
     * @return builder instance for chain calls.
     */
    setOfferId(offerId: string): PurchaseOptionsBuilder {
        this.offerId = offerId;
        return this;
    }

    /**
     * Android only.
     * Call this function to remove any intro/trial offer from the purchase (use only a bare base plan).
     * @return builder instance for chain calls.
     */
    removeOffer(): PurchaseOptionsBuilder {
        this.applyOffer = false;
        return this;
    }

    /**
     * Android only.
     * Set Qonversion product from which the upgrade/downgrade will be initialized.
     *
     * @param oldProduct Qonversion product from which the upgrade/downgrade
     * will be initialized.
     * @return builder instance for chain calls.
     */
    setOldProduct(oldProduct: Product): PurchaseOptionsBuilder {
        this.oldProduct = oldProduct;
        return this;
    }

    /**
     * Android only.
     * Set the update policy for the purchase.
     * If the {@link updatePolicy} is not provided, then default one
     * will be selected - {@link PurchaseUpdatePolicy.WITH_TIME_PRORATION}.
     * @param updatePolicy update policy for the purchase.
     * @return builder instance for chain calls.
     */
    setUpdatePolicy(updatePolicy: PurchaseUpdatePolicy): PurchaseOptionsBuilder {
        this.updatePolicy = updatePolicy;
        return this;
    }

    /**
     * Set the context keys associated with a purchase.
     *
     * @param contextKeys context keys for the purchase.
     * @return builder instance for chain calls.
     */
    setContextKeys(contextKeys: string[]): PurchaseOptionsBuilder {
        this.contextKeys = contextKeys;
        return this;
    }

    /**
     * Set the promotional offer details.
     *
     * @param promoOffer promotional offer details.
     * @return builder instance for chain calls.
     */
    setPromotionalOffer(promoOffer: PromotionalOffer): PurchaseOptionsBuilder {
        this.promoOffer = promoOffer;
        return this;
    }

    /**
     * Generate {@link PurchaseOptions} instance with all the provided options.
     * @return the complete {@link PurchaseOptions} instance.
     */
    build(): PurchaseOptions {
        return new PurchaseOptions(
            this.offerId,
            this.applyOffer,
            this.oldProduct,
            this.updatePolicy,
            this.contextKeys,
            this.quantity,
            this.promoOffer);
    }
}