import { ErrorResponse } from "../../global/models/errorResponse";
import { CheckoutInformationResponse } from "../../global/models/checkoutInformationResponse";

/**
 * The checkout service knows how to do api calls and handle the responses from the api.
 * All related to the checkout process. It does not do anything with the DOM.
 */
class CheckoutService {
    constructor() {
        this._baseRoute = '/';
    }

    /**
     * Sets the shipping address so that the shipping costs for example
     * can be calculated on advance
     *
     * @param {Address} address
     * @return {Promise<boolean>} Resolves when the shipping address is set. Rejects with an ErrorResponse when it is not.
     */
    setShippingAddress(address)
    {
        let self = this;
        return new Promise(function(resolve, reject) {
            Ajax.post(
                self._baseRoute+'setShippingAddress',
                address,
                function(xhr) {
                    // let response = JSON.parse(xhr.response);
                    if(ErrorResponse.is(xhr.response, false) === false) {
                        resolve()
                    } else {
                        let response = ErrorResponse.fromJsonString(xhr.response);
                        reject(response);
                    }
                }
            );
        })
    }

    /**
     * Returns most recent information about the checkout process
     */
    getCheckoutInformation()
    {
        let self = this;
        return new Promise(function(resolve, reject) {
            Ajax.get(
                self._baseRoute+'getCheckoutInformation',
                function(xhr) {
                    // let response = JSON.parse(xhr.response);
                    let isErrorResponse = ErrorResponse.is(xhr.response, false);
                    let isCheckoutInformationResponse = CheckoutInformationResponse.is(xhr.response, false);

                    if(!isErrorResponse) {
                        if(isCheckoutInformationResponse) {
                            let checkoutInformationResponse = CheckoutInformationResponse.fromJsonString(xhr.response);
                            resolve(checkoutInformationResponse);
                        }
                        else {
                            console.error('CheckoutService:getCheckoutInformation The response was not a valid CheckoutInformationResponse: '+xhr.response);
                            reject();
                        }
                    } else {
                        let response = ErrorResponse.fromJsonString(xhr.response);
                        reject(response);
                    }
                }
            );
        })
    }

    /**
     * @param {string} coupon
     * @return {Promise}
     */
    addCoupon(coupon) {
        let self = this;

        if(typeof coupon !== 'string') {
            console.error('CheckoutService:addCoupon could not add coupon. It must be a string but was not.');
            return Promise.reject('CheckoutService:addCoupon could not add coupon. It must be a string but was not.');
        }

        return new Promise(function(resolve, reject) {
            Ajax.post(
                self._baseRoute+'addCouponCode',
                {'coupon': coupon},
                function(xhr) {
                    // let response = JSON.parse(xhr.response);
                    let isErrorResponse = ErrorResponse.is(xhr.response, false);
                    let isCheckoutInformationResponse = CheckoutInformationResponse.is(xhr.response, false);

                    if(!isErrorResponse) {
                        if(isCheckoutInformationResponse) {
                            let checkoutInformationResponse = CheckoutInformationResponse.fromJsonString(xhr.response);
                            resolve(checkoutInformationResponse);
                        }
                        else {
                            console.error('CheckoutService:addCoupon The response was not a valid CheckoutInformationResponse: '+xhr.response);
                            reject();
                        }
                    } else {
                        let response = ErrorResponse.fromJsonString(xhr.response);
                        reject(response);
                    }
                }
            );
        });
    }

    /**
     * @param {string} coupon
     * @return {Promise}
     */
    removeCoupon(coupon) {
        let self = this;

        if(typeof coupon !== 'string') {
            console.error('CheckoutService:removeCoupon could not remove coupon. It must be a string but was not.', coupon);
            return Promise.reject('CheckoutService:removeCoupon could not remove coupon. It must be a string but was not.');
        }

        return new Promise(function(resolve, reject) {
            Ajax.post(
                self._baseRoute+'removeCouponCode',
                {'coupon': coupon},
                function(xhr) {
                    // let response = JSON.parse(xhr.response);
                    let isErrorResponse = ErrorResponse.is(xhr.response, false);
                    let isCheckoutInformationResponse = CheckoutInformationResponse.is(xhr.response, false);

                    if(!isErrorResponse) {
                        if(isCheckoutInformationResponse) {
                            let checkoutInformationResponse = CheckoutInformationResponse.fromJsonString(xhr.response);
                            resolve(checkoutInformationResponse);
                        }
                        else {
                            console.error('CheckoutService:removeCoupon The response was not a valid CheckoutInformationResponse: '+xhr.response);
                            reject();
                        }
                    } else {
                        let response = ErrorResponse.fromJsonString(xhr.response);
                        reject(response);
                    }
                }
            );
        });
    }
}

export { CheckoutService }