// ==UserScript==
// @name         Wayfarer Translate
// @version      0.3.3
// @description  Add translate option to Wayfarer
// @namespace    https://gitlab.com/NvlblNm/wayfarer/
// @downloadURL  https://gitlab.com/NvlblNm/wayfarer/raw/master/wayfarer-translate.user.js
// @homepageURL  https://gitlab.com/NvlblNm/wayfarer/
// @match        https://wayfarer.nianticlabs.com/*
// ==/UserScript==

/* eslint-env es6 */
/* eslint no-var: "error" */

function init() {
    let tryNumber = 15

    let translateButton
    let candidate

    const SPACING = '\r\n\r\n'

    let engine = localStorage['translate-engine']
    if (!engine) {
        engine = 'Google'
        localStorage['translate-engine'] = engine
    }

    /**
     * Overwrite the open method of the XMLHttpRequest.prototype to intercept the server calls
     */
    ;(function (open) {
        XMLHttpRequest.prototype.open = function (method, url) {
            if (url === '/api/v1/vault/review') {
                if (method === 'GET') {
                    this.addEventListener('load', parseCandidate, false)
                }
                if (method === 'POST') {
                    hideButton()
                }
            }
            open.apply(this, arguments)
        }
    })(XMLHttpRequest.prototype.open)

    addCss()

    function parseCandidate(e) {
        try {
            const response = this.response
            const json = JSON.parse(response)
            if (!json) {
                console.log(response)
                alert('Failed to parse response from Wayfarer')
                return
            }
            // ignore if it's related to captchas
            if (json.captcha) {
                return
            }

            if (json.code !== 'OK') {
                return
            }

            candidate = json.result
            if (!candidate) {
                console.log(json)
                alert("Wayfarer's response didn't include a candidate.")
                return
            }
            addTranslateButton()
        } catch (e) {
            console.log(e) // eslint-disable-line no-console
        }
    }

    function getTranslatorLink() {
        switch (engine) {
            case 'Google':
                return 'https://translate.google.com/?sl=auto&q='

            default:
                return (
                    'https://www.deepl.com/translator#auto/' +
                    navigator.language +
                    '/'
                )
        }
    }

    function createButton(ref) {
        if (!translateButton) {
            const div = document.createElement('div')
            div.className = 'wayfarertranslate'
            const link = document.createElement('a')
            link.className = ''
            link.title = 'Translate nomination'
            link.innerHTML =
                '<svg viewBox="0 0 24 24"><path d="M12.87 15.07l-2.54-2.51.03-.03A17.52 17.52 0 0014.07 6H17V4h-7V2H8v2H1v2h11.17C11.5 7.92 10.44 9.75 9 11.35 8.07 10.32 7.3 9.19 6.69 8h-2c.73 1.63 1.73 3.17 2.98 4.56l-5.09 5.02L4 19l5-5 3.11 3.11.76-2.04M18.5 10h-2L12 22h2l1.12-3h4.75L21 22h2l-4.5-12m-2.62 7l1.62-4.33L19.12 17h-3.24z"/></svg>'
            link.target = '_blank'

            const select = document.createElement('select')
            select.title = 'Select translation engine'
            const engines = [
                { name: 'Google', title: 'Google Translate' },
                { name: 'DeepL', title: 'DeepL Translate' }
            ]

            select.innerHTML = engines
                .map(
                    (item) =>
                        `<option value="${item.name}" ${
                            item.name === engine ? 'selected' : ''
                        }>${item.title}</option>`
                )
                .join('')
            select.addEventListener('change', function () {
                engine = select.value
                localStorage['translate-engine'] = engine
                link.href =
                    getTranslatorLink() + encodeURIComponent(link.dataset.text)
            })

            div.appendChild(link)
            div.appendChild(select)
            translateButton = div
        }

        const container = ref.parentNode.parentNode
        if (!container.contains(translateButton)) {
            container.appendChild(translateButton)
        }
    }

    function addTranslateButton() {
        const ref = document.querySelector('wf-logo')

        if (!ref) {
            if (tryNumber === 0) {
                document
                    .querySelector('body')
                    .insertAdjacentHTML(
                        'afterBegin',
                        '<div class="alert alert-danger"><strong><span class="glyphicon glyphicon-remove"></span> Wayfarer Translate initialization failed, refresh page</strong></div>'
                    )
                return
            }
            setTimeout(addTranslateButton, 1000)
            tryNumber--
            return
        }

        let text = ''
        if (candidate.type === 'NEW') {
            text =
                candidate.title +
                SPACING +
                candidate.description +
                SPACING +
                candidate.statement
        }

        if (candidate.type === 'EDIT') {
            const title =
                candidate.title ||
                candidate.titleEdits.map((d) => d.value).join(SPACING)
            const description =
                candidate.description ||
                candidate.descriptionEdits.map((d) => d.value).join(SPACING)
            text = title + SPACING + SPACING + description
        }
        if (candidate.type === 'PHOTO') {
            text = candidate.title + SPACING + candidate.description
        }

        if (text !== '') {
            createButton(ref)
            const link = translateButton.querySelector('a')
            link.dataset.text = text
            link.href = getTranslatorLink() + encodeURIComponent(text)
            translateButton.classList.add('wayfarertranslate__visible')
        }
    }

    function hideButton() {
        translateButton.classList.remove('wayfarertranslate__visible')
    }

    function addCss() {
        const css = `

            .wayfarertranslate {
                color: #333;
                margin-left: 2em;
                padding-top: 0.3em;
                text-align: center;
                display: none;
            }

            .wayfarertranslate__visible {
                display: inline;
            }

            .wayfarertranslate svg {
                width: 24px;
                height: 24px;
                filter: none;
                fill: currentColor;
                margin: 0 auto;
            }

            .dark .wayfarertranslate {
                color: #ddd;
            }

            .dark .wayfarertranslate select,
            .dark .wayfarertranslate option {
                background: #000;
            }
            `
        const style = document.createElement('style')
        style.type = 'text/css'
        style.innerHTML = css
        document.querySelector('head').appendChild(style)
    }
}

init()