(function (document) {
    const captchaBlocks = document.querySelectorAll('div.captcha-service-kor-elf');
    captchaBlocks.forEach(function (element) {
        const shadow = element.attachShadow({ mode: 'closed' });
        const button = document.createElement("button");
        const style = document.createElement('link');
        const domain = element.getAttribute('data-domain');
        const token = element.getAttribute('data-token');

        let windowCaptcha = null;

        style.rel = 'stylesheet';
        style.type = 'text/css';
        style.href = 'style.css';
        shadow.appendChild(style);

        button.textContent = 'Я не робот!';
        button.type = 'button';
        button.classList.add('button-open-window-captcha');
        shadow.appendChild(button);
        button.addEventListener('click', function () {
            if (windowCaptcha === null) {
                windowCaptcha = createWindowCaptcha(shadow, domain, token);
            }
            windowCaptcha.style.display = 'block';
            actionGetCaptcha(windowCaptcha, domain, token, shadow);
        });
    });

    function createWindowCaptcha (shadow, domain, token) {
        const windowCaptcha = document.createElement('div');
        windowCaptcha.classList.add('window-captcha');
        windowCaptcha.innerHTML = `<div class="window-captcha__content">
            <div class="window-captcha__content__header">Я не робот! <button type="button" class="window-captcha__reload"></button><button type="button" class="window-captcha__close">X</button></div>
            <div class="window-captcha__content__body"></div>
        </div>`;
        shadow.appendChild(windowCaptcha);

        windowCaptcha.addEventListener('click', function (event) {
            if (event.target !== windowCaptcha) {
                return null;
            }
            actionClose(windowCaptcha);
        });

        windowCaptcha.querySelector('button.window-captcha__close').addEventListener('click', function () {
           actionClose(windowCaptcha);
        });

        windowCaptcha.querySelector('button.window-captcha__reload').addEventListener('click', function () {
            actionGetCaptcha(windowCaptcha, domain, token);
        });

        return windowCaptcha;
    }

    function actionClose(windowCaptcha)
    {
        windowCaptcha.style.display = 'none';
    }

    function actionGetCaptcha(windowCaptcha, domain, token, shadow)
    {
        let bodyBlock = windowCaptcha.querySelector('div.window-captcha__content__body');
        if (bodyBlock.querySelectorAll('.loading').length > 0) {
            return null;
        }
        bodyBlock.innerHTML = '<div class="loading"></div>';
        fetch(domain + '/api/v1/captcha', {
            headers: {
                'Content-Type': 'application/json',
                'Accept': 'application/json',
                'public-token': token
            }
        })
        .then(response => response.json())
        .then(function (data) {
            let originalWidth = data.image_body.width;
            let originalHeight = data.image_body.height;
            bodyBlock.innerHTML = `
                <form method="post">
                    <div class="window-captcha__content__body__head"><img src="${ data.image_head.base64 }" width="100%"></div>
                    <p>Выберите значение в том порядке, на котором на картинке выше:</p>
                    <div class="window-captcha__content__body__coordinator"><img src="${ data.image_body.base64 }" width="100%" /></div>
                    <input type="hidden" name="captcha_key" class="captcha_key" value="${ data.captcha_key }" />
                    <button type="button" class="window-captcha__content__body__button">Я не робот!</button>
                </form>
           `;
            let blockCoordinator = bodyBlock.querySelector('div.window-captcha__content__body__coordinator');
            let blockCoordinatorImg = blockCoordinator.querySelector('img');
            blockCoordinatorImg.addEventListener('click', function (event) {
                let pointer = document.createElement('div');
                pointer.style.left = ( event.offsetX / blockCoordinatorImg.width * 100 ) + '%';
                pointer.style.top = ( event.offsetY / blockCoordinatorImg.height * 100 ) + '%';
                pointer.classList.add('pointer');

                let coordinatorX = event.offsetX * (originalWidth / blockCoordinatorImg.width)
                let coordinatorY = event.offsetY * (originalHeight / blockCoordinatorImg.height)

                let pointerNumber = blockCoordinator.querySelectorAll('.pointer').length + 1
                pointer.innerHTML = `
                    <span class="pounter__number">${ pointerNumber }</span>
                    <input type="hidden" class="x" name="pointer[][x]" value="${ Math.round(coordinatorX) }" />
                    <input type="hidden" class="y" name="pointer[][y]" value="${ Math.round(coordinatorY) }" />
                `;

                pointer.addEventListener('click', function () {
                    pointer.remove();
                    blockCoordinator.querySelectorAll('.pointer').forEach(function (elementPointer, pointIndex) {
                        elementPointer.querySelector('span.pounter__number').textContent = pointIndex + 1;
                    });
                });

                blockCoordinator.appendChild(pointer);
            });

            bodyBlock.querySelector('.window-captcha__content__body__button').addEventListener('click', function () {
                checkingCaptcha(bodyBlock, domain, token, shadow);
            });
        })
        .catch(error => {
            bodyBlock.innerHTML = `<div class="window-captcha__content__body__error">Произошла ошибка, сервис с каптчей не ответил. Попробуйте ещё раз!</div>`;
        });
    }

    function checkingCaptcha (bodyBlock, domain, token, shadow) {
        let button = bodyBlock.querySelector('button.window-captcha__content__body__button');
        if (button.querySelectorAll('.loading').length > 0) {
            return null;
        }
        let loadingSpan = document.createElement('span');
        loadingSpan.classList.add('loading');
        button.appendChild(loadingSpan);

        let data = {
            captcha_key: bodyBlock.querySelector('.captcha_key').value,
            verification: []
        };
        bodyBlock.querySelectorAll('.pointer').forEach(function (elementPointer) {
            data["verification"].push({
                x: elementPointer.querySelector('.x').value,
                y: elementPointer.querySelector('.y').value
            });
        });

        fetch(domain + '/api/v1/captcha', {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json',
                'Accept': 'application/json',
                'public-token': token
            },
            body: JSON.stringify(data)
        })
        .then(response => response.json())
        .then(function (data) {
            if (typeof data.errors !== 'undefined') {
                let errorMessage = '';
                for (let key in data.errors) {
                    errorMessage += data.errors[key] + '<br>';
                }
                setError(errorMessage, button);
                return
            }
            shadow.querySelector('button.button-open-window-captcha').remove();
            let captchaVerified = document.createElement('div');
            captchaVerified.innerHTML = `<span class="captcha-verified">Ура!!! Проверку прошли!</span><input type="hidden" name="captcha-verified" value="${ data.captcha_key }">`;
            shadow.appendChild(captchaVerified);
            shadow.querySelector('.window-captcha').remove();
        })
        .catch(error => {
            setError('Произошла ошибка!', button)
        }).finally(function () {
            loadingSpan.remove();
        });
    }

    function setError(message, button) {
        let errorBlock = document.createElement('div');
        errorBlock.classList.add("error-message");
        errorBlock.innerHTML = message;
        button.before(errorBlock);

        setTimeout( function () {
            errorBlock.remove();
        }, 3000);
    }

})(document);