text: const htmlparser = require('htmlparser2');
  const got = require('got').extend( {
  	throwHttpErrors: false,
  	timeout: 5000,
  	headers: {
  		'User-Agent': 'Wiki-Bot/' + ( isDebug ? 'testing' : process.env.npm_package_version ) + ' (Discord; ' + process.env.npm_package_name + ')'
  	},
  	responseType: 'json'
  } );
  
  /**
   * Parse infobox content
   * @param {Object} infobox - The content of the infobox.
   * @param {import('discord.js').MessageEmbed} embed - The message embed.
   * @param {String} [thumbnail] - The default thumbnail for the wiki.
   * @param {String} [pagelink] - The article path for relative links.
   * @returns {import('discord.js').MessageEmbed?}
   */
  function parse_infobox(infobox, embed, thumbnail, pagelink = '') {
  	if ( !infobox || embed.fields.length >= 25 || embed.length > 5400 ) return;
  	if ( infobox.parser_tag_version === 2 ) {
  		infobox.data.forEach( group => {
  			parse_infobox(group, embed, thumbnail, pagelink);
  		} );
  		embed.fields = embed.fields.filter( (field, i, fields) => {
  			if ( field.name !== '\u200b' || !field.value.startsWith( '__**' ) ) return true;
  			return ( fields[i + 1]?.name && ( fields[i + 1].name !== '\u200b' || !fields[i + 1].value.startsWith( '__**' ) ) );
  		} );
  		return embed;
  	}
  	switch ( infobox.type ) {
  		case 'data':
  			var {label = '', value = '', source = '', 'item-name': name = ''} = infobox.data;
  			label = htmlToPlain(label).trim();
  			value = htmlToDiscord(value, pagelink, true).trim();
  			if ( label.includes( '*UNKNOWN LINK*' ) ) {
  				if ( !( source || name ) ) break;
  				label = '`' + ( source || name )  + '`';
  				embed.brokenInfobox = true;
  			}
  			if ( value.includes( '*UNKNOWN LINK*' ) ) {
  				if ( !( source || name ) ) break;
  				value = '`' + ( source || name ) + '`';
  				embed.brokenInfobox = true;
  			}
  			if ( label.length > 100 ) label = label.substring(0, 100) + '\u2026';
  			if ( value.length > 500 ) value = limitLength(value, 500, 250);
  			if ( label && value ) embed.addField( label, value, true );
  			break;
  		case 'panel':
  			var embedLength = embed.fields.length;
  			infobox.data.value.forEach( group => {
  				parse_infobox(group, embed, thumbnail, pagelink);
  			} );
  			embed.fields = embed.fields.filter( (field, i, fields) => {
  				if ( i < embedLength || field.name !== '\u200b' ) return true;
  				if ( !field.value.startsWith( '__**' ) ) return true;
  				return ( fields[i + 1]?.name && fields[i + 1].name !== '\u200b' );
  			} ).filter( (field, i, fields) => {
  				if ( i < embedLength || field.name !== '\u200b' ) return true;
  				if ( field.value.startsWith( '__**' ) ) return true;
  				return ( fields[i + 1]?.name && ( fields[i + 1].name !== '\u200b' || !fields[i + 1].value.startsWith( '__**' ) ) );
  			} );
  			break;
  		case 'section':
  			var {label = ''} = infobox.data;
  			label = htmlToPlain(label).trim();
  			if ( label.length > 100 ) label = label.substring(0, 100) + '\u2026';
  			if ( label ) embed.addField( '\u200b', '**' + label + '**', false );
  		case 'group':
  			infobox.data.value.forEach( group => {
  				parse_infobox(group, embed, thumbnail, pagelink);
  			} );
  			break;
  		case 'header':
  			var {value = ''} = infobox.data;
  			value = htmlToPlain(value).trim();
  			if ( value.length > 100 ) value = value.substring(0, 100) + '\u2026';
  			if ( value ) embed.addField( '\u200b', '__**' + value + '**__', false );
  			break;
  		case 'image':
  			if ( embed.thumbnail?.url !== thumbnail ) return;
  			var image = infobox.data.find( img => {
  				return ( /^(?:https?:)?\/\//.test(img.url) && /\.(?:png|jpg|jpeg|gif)$/.test(img.name) );
  			} );
  			if ( image ) embed.setThumbnail( image.url.replace( /^(?:https?:)?\/\//, 'https://' ) );
  			break;
  	}
  }
  
  /**
   * Make wikitext formatting usage.
   * @param {String} [text] - The text to modify.
   * @param {Boolean} [showEmbed] - If the text is used in an embed.
   * @param {import('./wiki.js')} [wiki] - The wiki.
   * @param {String} [title] - The page title.
   * @param {Boolean} [fullWikitext] - If the text can contain full wikitext.
   * @returns {String}
   */
  function toFormatting(text = '', showEmbed = false, wiki, title = '', fullWikitext = false) {
  	if ( showEmbed ) return toMarkdown(text, wiki, title, fullWikitext);
  	else return toPlaintext(text, fullWikitext);
  };
  
  /**
   * Turns wikitext formatting into markdown.
   * @param {String} [text] - The text to modify.
   * @param {import('./wiki.js')} wiki - The wiki.
   * @param {String} [title] - The page title.
   * @param {Boolean} [fullWikitext] - If the text can contain full wikitext.
   * @returns {String}
   */
  function toMarkdown(text = '', wiki, title = '', fullWikitext = false) {
  	text = text.replace( /[()\\]/g, '\\$&' );
  	var link = null;
  	var regex = /\[\[(?:([^\|\]]+)\|)?([^\]]+)\]\]([a-z]*)/g;
  	while ( ( link = regex.exec(text) ) !== null ) {
  		var pagetitle = ( link[1] || link[2] );
  		var page = wiki.toLink(( /^[#\/]/.test(pagetitle) ? title + ( pagetitle.startsWith( '/' ) ? pagetitle : '' ) : pagetitle ), '', ( pagetitle.startsWith( '#' ) ? pagetitle.substring(1) : '' ), true);
  		text = text.replaceSave( link[0], '[' + link[2] + link[3] + '](' + page + ')' );
  	}
  	if ( title !== '' ) {
  		regex = /\/\*\s*([^\*]+?)\s*\*\/\s*(.)?/g;
  		while ( ( link = regex.exec(text) ) !== null ) {
  			text = text.replaceSave( link[0], '[→' + link[1] + '](' + wiki.toLink(title, '', link[1], true) + ')' + ( link[2] ? ': ' + link[2] : '' ) );
  		}
  	}
  	if ( fullWikitext ) {
  		regex = /\[(?:https?:)?\/\/([^ ]+) ([^\]]+)\]/g;
  		while ( ( link = regex.exec(text) ) !== null ) {
  			text = text.replaceSave( link[0], '[' + link[2] + '](https://' + link[1] + ')' );
  		}
  		return htmlToDiscord( text, '', true, true ).replaceSave( /'''/g, '**' ).replaceSave( /''/g, '*' );
  	}
  	return escapeFormatting(text, true);
  };
  
  /**
   * Removes wikitext formatting.
   * @param {String} [text] - The text to modify.
   * @param {Boolean} [fullWikitext] - If the text can contain full wikitext.
   * @returns {String}
   */
  function toPlaintext(text = '', fullWikitext = false) {
  	text = text.replace( /\[\[(?:[^\|\]]+\|)?([^\]]+)\]\]/g, '$1' ).replace( /\/\*\s*([^\*]+?)\s*\*\//g, '→$1:' );
  	if ( fullWikitext ) {
  		return htmlToDiscord( text.replace( /\[(?:https?:)?\/\/(?:[^ ]+) ([^\]]+)\]/g, '$1' ) );
  	}
  	else return escapeFormatting(text);
  };
  
  /**
   * Change HTML text to plain text.
   * @param {String} html - The text in HTML.
   * @returns {String}
   */
  function htmlToPlain(html) {
  	var text = '';
  	var ignoredTag = '';
  	var parser = new htmlparser.Parser( {
  		onopentag: (tagname, attribs) => {
  			if ( tagname === 'sup' && attribs.class === 'reference' ) ignoredTag = 'sup';
  			if ( tagname === 'span' && attribs.class === 'smwttcontent' ) ignoredTag = 'span';
  		},
  		ontext: (htmltext) => {
  			if ( !ignoredTag ) text += escapeFormatting(htmltext);
  		},
  		onclosetag: (tagname) => {
  			if ( tagname === ignoredTag ) ignoredTag = '';
  		}
  	} );
  	parser.write( html );
  	parser.end();
  	return text;
  };
  
  /**
   * Change HTML text to markdown text.
   * @param {String} html - The text in HTML.
   * @param {String} [pagelink] - The article path for relative links.
   * @param {Boolean[]} [escapeArgs] - Arguments for the escaping of text formatting.
   * @returns {String}
   */
  function htmlToDiscord(html, pagelink = '', ...escapeArgs) {
  	var text = '';
  	var code = false;
  	var href = '';
  	var ignoredTag = '';
  	var listlevel = -1;
  	var parser = new htmlparser.Parser( {
  		onopentag: (tagname, attribs) => {
  			if ( ignoredTag || code ) return;
  			if ( tagname === 'sup' && attribs.class === 'reference' ) ignoredTag = 'sup';
  			if ( tagname === 'span' && attribs.class === 'smwttcontent' ) ignoredTag = 'span';
  			if ( tagname === 'code' ) {
  				code = true;
  				text += '`';
  			}
  			if ( tagname === 'pre' ) {
  				code = true;
  				text += '```\n';
  			}
  			if ( tagname === 'b' ) text += '**';
  			if ( tagname === 'i' ) text += '*';
  			if ( tagname === 's' ) text += '~~';
  			if ( tagname === 'u' ) text += '__';
  			if ( tagname === 'br' ) {
  				text += '\n';
  				if ( listlevel > -1 ) text += '\u200b '.repeat(4 * listlevel + 3);
  			}
  			if ( tagname === 'hr' ) {
  				text = text.replace( / +$/, '' );
  				if ( !text.endsWith( '\n' ) ) text += '\n';
  				text += '─'.repeat(10) + '\n';
  			}
  			if ( tagname === 'p' && !text.endsWith( '\n' ) ) text += '\n';
  			if ( tagname === 'ul' ) listlevel++;
  			if ( tagname === 'li' ) {
  				text = text.replace( / +$/, '' );
  				if ( !text.endsWith( '\n' ) ) text += '\n';
  				if ( attribs.class !== 'mw-empty-elt' ) {
  					if ( listlevel > -1 ) text += '\u200b '.repeat(4 * listlevel);
  					text += '• ';
  				}
  			}
  			if ( tagname === 'dl' ) listlevel++;
  			if ( tagname === 'dt' ) {
  				text = text.replace( / +$/, '' );
  				if ( !text.endsWith( '\n' ) ) text += '\n';
  				if ( attribs.class !== 'mw-empty-elt' ) {
  					if ( listlevel > -1 ) text += '\u200b '.repeat(4 * listlevel);
  					text += '**';
  				}
  			}
  			if ( tagname === 'dd' ) {
  				text = text.replace( / +$/, '' );
  				if ( !text.endsWith( '\n' ) ) text += '\n';
  				if ( listlevel > -1 && attribs.class !== 'mw-empty-elt' ) text += '\u200b '.repeat(4 * (listlevel + 1));
  			}
  			if ( tagname === 'img' ) {
  				if ( attribs.alt && attribs.src ) {
  					let showAlt = true;
  					if ( attribs['data-image-name'] === attribs.alt ) showAlt = false;
  					else {
  						let regex = new RegExp( '/([\\da-f])/\\1[\\da-f]/' + attribs.alt.replace( / /g, '_' ).replace( /\W/g, '\\$&' ) + '(?:/|\\?|$)' );
  						if ( attribs.src.startsWith( 'data:' ) && attribs['data-src'] ) attribs.src = attribs['data-src'];
  						if ( regex.test(attribs.src.replace( /(?:%[\dA-F]{2})+/g, partialURIdecode )) ) showAlt = false;
  					}
  					if ( showAlt ) {
  						if ( href && !code ) attribs.alt = attribs.alt.replace( /[\[\]]/g, '\\$&' );
  						if ( code ) text += attribs.alt.replace( /`/g, 'ˋ' );
  						else text += escapeFormatting(attribs.alt, ...escapeArgs);
  					}
  				}
  			}
  			if ( tagname === 'h1' ) {
  				text = text.replace( / +$/, '' );
  				if ( !text.endsWith( '\n' ) ) text += '\n';
  				text += '***__';
  			}
  			if ( tagname === 'h2' ) {
  				text = text.replace( / +$/, '' );
  				if ( !text.endsWith( '\n' ) ) text += '\n';
  				text += '**__';
  			}
  			if ( tagname === 'h3' ) {
  				text = text.replace( / +$/, '' );
  				if ( !text.endsWith( '\n' ) ) text += '\n';
  				text += '**';
  			}
  			if ( tagname === 'h4' ) {
  				text = text.replace( / +$/, '' );
  				if ( !text.endsWith( '\n' ) ) text += '\n';
  				text += '__';
  			}
  			if ( tagname === 'h5' ) {
  				text = text.replace( / +$/, '' );
  				if ( !text.endsWith( '\n' ) ) text += '\n';
  				text += '*';
  			}
  			if ( tagname === 'h6' ) {
  				text = text.replace( / +$/, '' );
  				if ( !text.endsWith( '\n' ) ) text += '\n';
  				text += '';
  			}
  			if ( !pagelink ) return;
  			if ( tagname === 'a' && attribs.href && attribs.class !== 'new' && /^(?:(?:https?:)?\/\/|\/|#)/.test(attribs.href) ) {
  				href = new URL(attribs.href, pagelink).href;
  				if ( text.endsWith( '](<' + href.replace( /[()]/g, '\\$&' ) + '>)' ) ) {
  					text = text.substring(0, text.length - ( href.replace( /[()]/g, '\\$&' ).length + 5 ));
  				}
  				else text += '[';
  			}
  		},
  		ontext: (htmltext) => {
  			if ( !ignoredTag ) {
  				if ( href && !code ) htmltext = htmltext.replace( /[\[\]]/g, '\\$&' );
  				if ( code ) text += htmltext.replace( /`/g, 'ˋ' );
  				else text += escapeFormatting(htmltext, ...escapeArgs);
  			}
  		},
  		onclosetag: (tagname) => {
  			if ( tagname === ignoredTag ) {
  				ignoredTag = '';
  				return;
  			}
  			if ( code ) {
  				if ( tagname === 'code' ) {
  					code = false;
  					text += '`';
  				}
  				if ( tagname === 'pre' ) {
  					code = false;
  					text += '\n```';
  				}
  				return;
  			}
  			if ( tagname === 'b' ) text += '**';
  			if ( tagname === 'i' ) text += '*';
  			if ( tagname === 's' ) text += '~~';
  			if ( tagname === 'u' ) text += '__';
  			if ( tagname === 'ul' ) listlevel--;
  			if ( tagname === 'dl' ) listlevel--;
  			if ( tagname === 'dt' ) text += '**';
  			if ( tagname === 'h1' ) text += '__***';
  			if ( tagname === 'h2' ) text += '__**';
  			if ( tagname === 'h3' ) text += '**';
  			if ( tagname === 'h4' ) text += '__';
  			if ( tagname === 'h5' ) text += '*';
  			if ( tagname === 'h6' ) text += '';
  			if ( !pagelink ) return;
  			if ( tagname === 'a' && href ) {
  				if ( text.endsWith( '[' ) ) text = text.substring(0, text.length - 1);
  				else text += '](<' + href.replace( /[()]/g, '\\$&' ) + '>)';
  				href = '';
  			}
  		},
  		oncomment: (commenttext) => {
  			if ( pagelink && /^(?:IW)?LINK'" \d+:\d+$/.test(commenttext) ) {
  				text += '*UNKNOWN LINK*';
  			}
  		}
  	} );
  	parser.write( html );
  	parser.end();
  	return text;
  };
  
  /**
   * Escapes formatting.
   * @param {String} [text] - The text to modify.
   * @param {Boolean} [isMarkdown] - The text contains markdown links.
   * @param {Boolean} [keepLinks] - Don't escape non-markdown links.
   * @returns {String}
   */
  function escapeFormatting(text = '', isMarkdown = false, keepLinks = false) {
  	if ( !isMarkdown ) text = text.replace( /[()\\]/g, '\\$&' );
  	if ( !keepLinks ) text = text.replace( /\/\//g, '\\$&' );
  	return text.replace( /[`_*~:<>{}@|]/g, '\\$&' );
  };
  
  /**
   * Limit text length without breaking link formatting.
   * @param {String} [text] - The text to modify.
   * @param {Number} [limit] - The character limit.
   * @param {Number} [maxExtra] - The maximal allowed character limit if needed.
   * @returns {String}
   */
  function limitLength(text = '', limit = 1000, maxExtra = 20) {
  	var suffix = '\u2026';
  	var link = null;
  	var regex = /(?<!\\)\[((?:[^\[\]]|\\[\[\]])*?[^\\])\]\(<?(?:[^()]|\\[()])+?[^\\]>?\)/g;
  	while ( ( link = regex.exec(text) ) !== null ) {
  		if ( link.index < limit && link.index + link[0].length > limit ) {
  			if ( link.index + link[0].length < limit + maxExtra ) suffix = link[0];
  			else if ( link.index + link[1].length < limit + maxExtra ) suffix = link[1];
  			if ( link.index + link[0].length < text.length ) suffix += '\u2026';
  			limit = link.index;
  			break;
  		}
  		else if ( link.index >= limit ) break;
  	}
  	return text.substring(0, limit) + suffix;
  };
  
  /**
   * Try to URI decode.
   * @param {String} m - The character to decode.
   * @returns {String}
   */
  function partialURIdecode(m) {
  	var text = '';
  	try {
  		text = decodeURIComponent( m );
  	}
  	catch ( replaceError ) {
  		if ( isDebug ) console.log( '- Failed to decode ' + m + ':' + replaceError );
  		text = m;
  	}
  	return text;
  };
  
  /**
   * Allow users to delete their command responses.
   * @param {import('discord.js').Message} msg - The response.
   * @param {String} author - The user id.
   */
  function allowDelete(msg, author) {
  	msg.awaitReactions( (reaction, user) => reaction.emoji.name === '🗑️' && user.id === author, {max:1,time:300000} ).then( reaction => {
  		if ( reaction.size ) {
  			msg.delete().catch(log_error);
  		}
  	} );
  };
  
  module.exports = {
  	got,
  	parse_infobox,
  	toFormatting,
  	toMarkdown,
  	toPlaintext,
  	htmlToPlain,
  	htmlToDiscord,
  	escapeFormatting,
  	limitLength,
  	partialURIdecode,
  	allowDelete
  };