/**
 * Controls the Currency attribute.
 * See currency.blade.php
 */
class Currency {
    constructor(currencyWrapper) {
        if(currencyWrapper === undefined || currencyWrapper.tagName !== "DIV") {
            console.error('Currency:constructor Missing the expected div element that represents the Currency wrapper.'); return;
        }
        this._wrapper = currencyWrapper;

        if(!'incVat' in this._wrapper.dataset || typeof this._wrapper.dataset.incVat !== "string") {
            console.error('Currency:constructor the currency wrapper must have a dataset property called incVat that must have a boolean value.'); return;
        }
        this._priceEnterdIncludingVat = this._wrapper.dataset.incVat === '1';

        this._realInput = this._wrapper.querySelector('input[type="hidden"]'); //NOTE: The real input MUST ALWAYS hold the price excluding vat.
        if(!this._realInput) {
            console.error('Currency:constructor Missing the expected hidden input in the currency wrapper.'); return;
        }

        this._previewInput = this._wrapper.querySelector('input.js_preview_input');
        this._regionContainer = this._wrapper.querySelector('.region');

        this._userInput = this._wrapper.querySelector('input.user_input');
        if(!this._userInput) {
            console.error('Currency:constructor Missing the expected ex vat input in the currency wrapper.'); return;
        }

        this._userInput = this._wrapper.querySelector('input.user_input');

        this._inputChanged = this._inputChanged.bind(this);
        this._vatCalculationResponseReceived = this._vatCalculationResponseReceived.bind(this);

        this._initialize();
        this.controlEventListeners();
    }

    /**
     * @param {boolean} enable
     */
    controlEventListeners(enable = true)
    {
        this._userInput.removeEventListener('change', this._inputChanged);

        if(enable) {
            this._userInput.addEventListener('change', this._inputChanged);
        }
    }

    /**
     * Triggered when the user input was changed.
     *
     * @param event
     * @private
     */
    _inputChanged(event)
    {
        let self = this;

        let requestData = new VatCalculationRequest();
        requestData.isIncludingVat = this._priceEnterdIncludingVat;
        requestData.price = Math.round(this._userInput.value * 100);

        Ajax.post('/kms/calculateVatAmount', requestData, this._vatCalculationResponseReceived);
    }

    _initialize()
    {
        let requestData = new VatCalculationRequest();
        requestData.isIncludingVat = false; //The real input always contains the price ex vat.
        requestData.price = (this._realInput.value === '') ? 0 : this._realInput.value;
        Ajax.post('/kms/calculateVatAmount', requestData, this._vatCalculationResponseReceived);
    }

    /**
     * @param {{}} xhr
     * @private
     */
    _vatCalculationResponseReceived(xhr)
    {
        let isVatCalculationResponse = VatCalculationResponse.is(xhr.response, true);

        if(isVatCalculationResponse) {
            let vatCalculationResponse = VatCalculationResponse.fromJsonString(xhr.response);
            this._previewInput.value = (this._priceEnterdIncludingVat) ? vatCalculationResponse.priceExVatForNumberInput : vatCalculationResponse.priceIncVatForNumberInput;
            this._userInput.value = (this._priceEnterdIncludingVat) ? vatCalculationResponse.priceIncVatForNumberInput : vatCalculationResponse.priceExVatForNumberInput;
            this._regionContainer.innerText = vatCalculationResponse.vatPercentage+'% - '+vatCalculationResponse.regionDisplayName;
            this._realInput.value = vatCalculationResponse.priceExVat;
        }
        else {
            console.error('Currency:_inputChanged The response was not a valid vatCalculationResponse: '+xhr.response);
        }
    }
}















/**
 * Represents a request from the frontend to the backend for calculating a certain price vat
 */
class VatCalculationRequest {
    constructor()
    {
        this._price = 0;
        this._isIncludingVat = false;
        this.toJSON = this._toJSON.bind(this);
    }

    /**
     * @return {{price: number, isIncludingVat: boolean}}
     * @private
     */
    _toJSON()
    {
        return {
            'price': this._price,
            'isIncludingVat': this._isIncludingVat,
        }
    }

    /**
     * @param {string} json
     * @return {CheckoutInformationResponse|null}
     */
    static fromJsonString(json) {
        if(!this.is(json)) {
            return null;
        }
        let jsonObject = JSON.parse(json);

        let instance = new this;

        instance._price = jsonObject.price;
        instance._isIncludingVat = jsonObject.isIncludingVat;

        return instance;
    }

    /**
     * Checks that the given json string represents a CheckoutInformationResponse
     *
     * @param {string} json
     * @param {boolean} logErrors
     * @return {boolean}
     */
    static is(json, logErrors = true)
    {
        let jsonObject = null;
        try {
            jsonObject = JSON.parse(json);
            if(!jsonObject) {
                if(logErrors) console.error('VatCalculationRequest: The given json does not represent a valid VatCalculationRequest since the json string was not a valid json');
                return false;
            }
        } catch (e) {
            if(logErrors) console.error('VatCalculationRequest: The given json does not represent a valid VatCalculationRequest since the json string was not a valid json');
            return false;
        }

        if(!jsonObject.hasOwnProperty('price') || typeof jsonObject.price !== 'number') {
            if(logErrors) console.error('VatCalculationResponse: The object must have a price property that is a number. Object: ', jsonObject);
            return false;
        }

        if(!jsonObject.hasOwnProperty('isIncludingVat') || typeof jsonObject.isIncludingVat !== "boolean") {
            if(logErrors) console.error('VatCalculationResponse: The object must have a isIncludingVat property that is a boolean. Object: ', jsonObject);
            return false;
        }

        return true;
    }

    get price() {
        return this._price;
    }

    set price(value) {
        this._price = value;
    }

    get isIncludingVat() {
        return this._isIncludingVat;
    }

    set isIncludingVat(value) {
        this._isIncludingVat = value;
    }
}

















/**
 * Represents a response from the backend as response on a VatCalculationRequest that was sent to the backend
 */
class VatCalculationResponse {
    constructor() {
        this._priceExVat = 0;
        this._priceExVatFormatted = '';
        this._priceExVatForNumberInput = 0;
        this._priceIncVat = 0;
        this._priceIncVatFormatted = '';
        this._priceIncVatForNumberInput = 0;
        this._vatAmount = 0;
        this._vatPercentage = 0;
        this._vatAmountFormatted = '';
        this._vatAmountForNumberInput = 0;
        this._regionDisplayName = '';
    }

    /**
     * @param {string} json
     * @return {CheckoutInformationResponse|null}
     */
    static fromJsonString(json) {
        if(!this.is(json)) {
            return null;
        }
        let jsonObject = JSON.parse(json);

        let instance = new this;

        instance._priceExVat = jsonObject.priceExVat;
        instance._priceExVatFormatted = jsonObject.priceExVatFormatted;
        instance._priceExVatForNumberInput = jsonObject.priceExVatForNumberInput;
        instance._priceIncVat = jsonObject.priceIncVat;
        instance._priceIncVatFormatted = jsonObject.priceIncVatFormatted;
        instance._priceIncVatForNumberInput = jsonObject.priceIncVatForNumberInput;
        instance._vatAmount = jsonObject.vatAmount;
        instance._vatPercentage = jsonObject.vatPercentage;
        instance._vatAmountFormatted = jsonObject.vatAmountFormatted;
        instance._vatAmountForNumberInput = jsonObject.vatAmountForNumberInput;
        instance._regionDisplayName = jsonObject.regionDisplayName;

        return instance;
    }

    /**
     * Checks that the given json string represents a CheckoutInformationResponse
     *
     * @param {string} json
     * @param {boolean} logErrors
     * @return {boolean}
     */
    static is(json, logErrors = true)
    {
        let jsonObject = null;
        try {
            jsonObject = JSON.parse(json);
            if(!jsonObject) {
                if(logErrors) console.error('VatCalculationResponse: The given json does not represent a valid VatCalculationResponse since the json string was not a valid json');
                return false;
            }
        } catch (e) {
            if(logErrors) console.error('VatCalculationResponse: The given json does not represent a valid VatCalculationResponse since the json string was not a valid json');
            return false;
        }

        if(!jsonObject.hasOwnProperty('priceExVat') || typeof jsonObject.priceExVat !== 'number') {
            if(logErrors) console.error('VatCalculationResponse: The response object must have a priceExVat property that is a number. Object: ', jsonObject);
            return false;
        }
        if(!jsonObject.hasOwnProperty('priceExVatFormatted') || typeof jsonObject.priceExVatFormatted !== 'string') {
            if(logErrors) console.error('VatCalculationResponse: The response object must have a priceExVatFormatted property that is a string. Object: ', jsonObject);
            return false;
        }
        if(!jsonObject.hasOwnProperty('priceExVatForNumberInput') || typeof jsonObject.priceExVatForNumberInput !== 'string') {
            if(logErrors) console.error('VatCalculationResponse: The response object must have a priceExVatForNumberInput property that is a string. Object: ', jsonObject);
            return false;
        }
        if(!jsonObject.hasOwnProperty('priceIncVat') || typeof jsonObject.priceIncVat !== 'number') {
            if(logErrors) console.error('VatCalculationResponse: The response object must have a priceIncVat property that is a number. Object: ', jsonObject);
            return false;
        }
        if(!jsonObject.hasOwnProperty('priceIncVatFormatted') || typeof jsonObject.priceIncVatFormatted !== 'string') {
            if(logErrors) console.error('VatCalculationResponse: The response object must have a priceIncVatFormatted property that is a string. Object: ', jsonObject);
            return false;
        }
        if(!jsonObject.hasOwnProperty('priceIncVatForNumberInput') || typeof jsonObject.priceIncVatForNumberInput !== 'string') {
            if(logErrors) console.error('VatCalculationResponse: The response object must have a priceIncVatForNumberInput property that is a string. Object: ', jsonObject);
            return false;
        }
        if(!jsonObject.hasOwnProperty('vatAmount') || typeof jsonObject.vatAmount !== 'number') {
            if(logErrors) console.error('VatCalculationResponse: The response object must have a vatAmount property that is a number. Object: ', jsonObject);
            return false;
        }
        if(!jsonObject.hasOwnProperty('vatAmountFormatted') || typeof jsonObject.vatAmountFormatted !== 'string') {
            if(logErrors) console.error('VatCalculationResponse: The response object must have a vatAmountFormatted property that is a string. Object: ', jsonObject);
            return false;
        }
        if(!jsonObject.hasOwnProperty('vatAmountForNumberInput') || typeof jsonObject.vatAmountForNumberInput !== 'string') {
            if(logErrors) console.error('VatCalculationResponse: The response object must have a vatAmountForNumberInput property that is a string. Object: ', jsonObject);
            return false;
        }
        if(!jsonObject.hasOwnProperty('regionDisplayName') || typeof jsonObject.regionDisplayName !== 'string') {
            if(logErrors) console.error('VatCalculationResponse: The response object must have a regionDisplayName property that is a string. Object: ', jsonObject);
            return false;
        }
        if(!jsonObject.hasOwnProperty('vatPercentage') || typeof jsonObject.vatPercentage !== 'number') {
            if(logErrors) console.error('VatCalculationResponse: The response object must have a vatPercentage property that is a number. Object: ', jsonObject);
            return false;
        }

        return true;
    }


    get priceExVat() {
        return this._priceExVat;
    }

    set priceExVat(value) {
        this._priceExVat = value;
    }

    get priceExVatFormatted() {
        return this._priceExVatFormatted;
    }

    set priceExVatFormatted(value) {
        this._priceExVatFormatted = value;
    }

    get priceExVatForNumberInput() {
        return this._priceExVatForNumberInput;
    }

    set priceExVatForNumberInput(value) {
        this._priceExVatForNumberInput = value;
    }

    get priceIncVat() {
        return this._priceIncVat;
    }

    set priceIncVat(value) {
        this._priceIncVat = value;
    }

    get priceIncVatFormatted() {
        return this._priceIncVatFormatted;
    }

    set priceIncVatFormatted(value) {
        this._priceIncVatFormatted = value;
    }

    get priceIncVatForNumberInput() {
        return this._priceIncVatForNumberInput;
    }

    set priceIncVatForNumberInput(value) {
        this._priceIncVatForNumberInput = value;
    }

    get vatAmount() {
        return this._vatAmount;
    }

    set vatAmount(value) {
        this._vatAmount = value;
    }

    get vatAmountFormatted() {
        return this._vatAmountFormatted;
    }

    set vatAmountFormatted(value) {
        this._vatAmountFormatted = value;
    }

    get vatAmountForNumberInput() {
        return this._vatAmountForNumberInput;
    }

    set vatAmountForNumberInput(value) {
        this._vatAmountForNumberInput = value;
    }

    get regionDisplayName() {
        return this._regionDisplayName;
    }

    set regionDisplayName(value) {
        this._regionDisplayName = value;
    }

    get vatPercentage() {
        return this._vatPercentage;
    }

    set vatPercentage(value) {
        this._vatPercentage = value;
    }
}