// Localization support
const messages = {
 'en': {
   'copy': 'Copy',
   'copy_to_clipboard': 'Copy to clipboard',
   'copy_success': 'Copied!',
   'copy_failure': 'Failed to copy',
 },
 'es' : {
   'copy': 'Copiar',
   'copy_to_clipboard': 'Copiar al portapapeles',
   'copy_success': '¡Copiado!',
   'copy_failure': 'Error al copiar',
 },
 'de' : {
   'copy': 'Kopieren',
   'copy_to_clipboard': 'In die Zwischenablage kopieren',
   'copy_success': 'Kopiert!',
   'copy_failure': 'Fehler beim Kopieren',
 },
 'fr' : {
   'copy': 'Copier',
   'copy_to_clipboard': 'Copier dans le presse-papier',
   'copy_success': 'Copié !',
   'copy_failure': 'Échec de la copie',
 },
 'ru': {
   'copy': 'Скопировать',
   'copy_to_clipboard': 'Скопировать в буфер',
   'copy_success': 'Скопировано!',
   'copy_failure': 'Не удалось скопировать',
 },
 'zh-CN': {
   'copy': '复制',
   'copy_to_clipboard': '复制到剪贴板',
   'copy_success': '复制成功!',
   'copy_failure': '复制失败',
 },
 'it' : {
   'copy': 'Copiare',
   'copy_to_clipboard': 'Copiato negli appunti',
   'copy_success': 'Copiato!',
   'copy_failure': 'Errore durante la copia',
 }
}

let locale = 'en'
if( document.documentElement.lang !== undefined
   && messages[document.documentElement.lang] !== undefined ) {
 locale = document.documentElement.lang
}

let doc_url_root = DOCUMENTATION_OPTIONS.URL_ROOT;
if (doc_url_root == '#') {
   doc_url_root = '';
}

/**
* SVG files for our copy buttons
*/
let iconCheck = `<svg xmlns="http://www.w3.org/2000/svg" class="icon icon-tabler icon-tabler-check" width="44" height="44" viewBox="0 0 24 24" stroke-width="2" stroke="#22863a" fill="none" stroke-linecap="round" stroke-linejoin="round">
 <title>${messages[locale]['copy_success']}</title>
 <path stroke="none" d="M0 0h24v24H0z" fill="none"/>
 <path d="M5 12l5 5l10 -10" />
</svg>`

// If the user specified their own SVG use that, otherwise use the default
let iconCopy = ``;
if (!iconCopy) {
 iconCopy = `<svg xmlns="http://www.w3.org/2000/svg" class="icon icon-tabler icon-tabler-copy" width="44" height="44" viewBox="0 0 24 24" stroke-width="1.5" stroke="#000000" fill="none" stroke-linecap="round" stroke-linejoin="round">
 <title>${messages[locale]['copy_to_clipboard']}</title>
 <path stroke="none" d="M0 0h24v24H0z" fill="none"/>
 <rect x="8" y="8" width="12" height="12" rx="2" />
 <path d="M16 8v-2a2 2 0 0 0 -2 -2h-8a2 2 0 0 0 -2 2v8a2 2 0 0 0 2 2h2" />
</svg>`
}

/**
* Set up copy/paste for code blocks
*/

const runWhenDOMLoaded = cb => {
 if (document.readyState != 'loading') {
   cb()
 } else if (document.addEventListener) {
   document.addEventListener('DOMContentLoaded', cb)
 } else {
   document.attachEvent('onreadystatechange', function() {
     if (document.readyState == 'complete') cb()
   })
 }
}

const codeCellId = index => `codecell${index}`

// Clears selected text since ClipboardJS will select the text when copying
const clearSelection = () => {
 if (window.getSelection) {
   window.getSelection().removeAllRanges()
 } else if (document.selection) {
   document.selection.empty()
 }
}

// Changes tooltip text for a moment, then changes it back
// We want the timeout of our `success` class to be a bit shorter than the
// tooltip and icon change, so that we can hide the icon before changing back.
var timeoutIcon = 2000;
var timeoutSuccessClass = 1500;

const temporarilyChangeTooltip = (el, oldText, newText) => {
 el.setAttribute('data-tooltip', newText)
 el.classList.add('success')
 // Remove success a little bit sooner than we change the tooltip
 // So that we can use CSS to hide the copybutton first
 setTimeout(() => el.classList.remove('success'), timeoutSuccessClass)
 setTimeout(() => el.setAttribute('data-tooltip', oldText), timeoutIcon)
}

// Changes the copy button icon for two seconds, then changes it back
const temporarilyChangeIcon = (el) => {
 el.innerHTML = iconCheck;
 setTimeout(() => {el.innerHTML = iconCopy}, timeoutIcon)
}

const addCopyButtonToCodeCells = () => {
 // If ClipboardJS hasn't loaded, wait a bit and try again. This
 // happens because we load ClipboardJS asynchronously.
 if (window.ClipboardJS === undefined) {
   setTimeout(addCopyButtonToCodeCells, 250)
   return
 }

 // Add copybuttons to all of our code cells
 const COPYBUTTON_SELECTOR = 'div.highlight pre';
 const codeCells = document.querySelectorAll(COPYBUTTON_SELECTOR)
 codeCells.forEach((codeCell, index) => {
   const id = codeCellId(index)
   codeCell.setAttribute('id', id)

   const clipboardButton = id =>
   `<button class="copybtn o-tooltip--left" data-tooltip="${messages[locale]['copy']}" data-clipboard-target="#${id}">
     ${iconCopy}
   </button>`
   codeCell.insertAdjacentHTML('afterend', clipboardButton(id))
 })

function escapeRegExp(string) {
   return string.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'); // $& means the whole matched string
}

/**
* Removes excluded text from a Node.
*
* @param {Node} target Node to filter.
* @param {string} exclude CSS selector of nodes to exclude.
* @returns {DOMString} Text from `target` with text removed.
*/
function filterText(target, exclude) {
   const clone = target.cloneNode(true);  // clone as to not modify the live DOM
   if (exclude) {
       // remove excluded nodes
       clone.querySelectorAll(exclude).forEach(node => node.remove());
   }
   return clone.innerText;
}

// Callback when a copy button is clicked. Will be passed the node that was clicked
// should then grab the text and replace pieces of text that shouldn't be used in output
function formatCopyText(textContent, copybuttonPromptText, isRegexp = false, onlyCopyPromptLines = true, removePrompts = true, copyEmptyLines = true, lineContinuationChar = "", hereDocDelim = "") {
   var regexp;
   var match;

   // Do we check for line continuation characters and "HERE-documents"?
   var useLineCont = !!lineContinuationChar
   var useHereDoc = !!hereDocDelim

   // create regexp to capture prompt and remaining line
   if (isRegexp) {
       regexp = new RegExp('^(' + copybuttonPromptText + ')(.*)')
   } else {
       regexp = new RegExp('^(' + escapeRegExp(copybuttonPromptText) + ')(.*)')
   }

   const outputLines = [];
   var promptFound = false;
   var gotLineCont = false;
   var gotHereDoc = false;
   const lineGotPrompt = [];
   for (const line of textContent.split('\n')) {
       match = line.match(regexp)
       if (match || gotLineCont || gotHereDoc) {
           promptFound = regexp.test(line)
           lineGotPrompt.push(promptFound)
           if (removePrompts && promptFound) {
               outputLines.push(match[2])
           } else {
               outputLines.push(line)
           }
           gotLineCont = line.endsWith(lineContinuationChar) & useLineCont
           if (line.includes(hereDocDelim) & useHereDoc)
               gotHereDoc = !gotHereDoc
       } else if (!onlyCopyPromptLines) {
           outputLines.push(line)
       } else if (copyEmptyLines && line.trim() === '') {
           outputLines.push(line)
       }
   }

   // If no lines with the prompt were found then just use original lines
   if (lineGotPrompt.some(v => v === true)) {
       textContent = outputLines.join('\n');
   }

   // Remove a trailing newline to avoid auto-running when pasting
   if (textContent.endsWith("\n")) {
       textContent = textContent.slice(0, -1)
   }
   return textContent
}


var copyTargetText = (trigger) => {
 var target = document.querySelector(trigger.attributes['data-clipboard-target'].value);

 // get filtered text
 let exclude = '.linenos, .gp, .go';

 let text = filterText(target, exclude);
 return formatCopyText(text, '', false, true, true, true, '', '')
}

 // Initialize with a callback so we can modify the text before copy
 const clipboard = new ClipboardJS('.copybtn', {text: copyTargetText})

 // Update UI with error/success messages
 clipboard.on('success', event => {
   clearSelection()
   temporarilyChangeTooltip(event.trigger, messages[locale]['copy'], messages[locale]['copy_success'])
   temporarilyChangeIcon(event.trigger)
 })

 clipboard.on('error', event => {
   temporarilyChangeTooltip(event.trigger, messages[locale]['copy'], messages[locale]['copy_failure'])
 })
}

runWhenDOMLoaded(addCopyButtonToCodeCells)

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