const {randomBytes} = require('crypto');
const {MessageEmbed} = require('discord.js');
var db = require('../util/database.js');
var verify = require('../functions/verify.js');
const {oauthVerify, allowDelete, escapeFormatting} = require('../util/functions.js');

/**
 * Processes the "verify" command.
 * @param {import('../util/i18n.js')} lang - The user language.
 * @param {import('discord.js').Message} msg - The Discord message.
 * @param {String[]} args - The command arguments.
 * @param {String} line - The command as plain text.
 * @param {import('../util/wiki.js')} wiki - The wiki for the message.
 */
function cmd_verify(lang, msg, args, line, wiki) {
	if ( !msg.channel.isGuild() || msg.defaultSettings ) return this.LINK(lang, msg, line, wiki);
	if ( !msg.guild.me.permissions.has('MANAGE_ROLES') ) {
		if ( msg.isAdmin() ) {
			console.log( msg.guild.id + ': Missing permissions - MANAGE_ROLES' );
			msg.replyMsg( lang.get('general.missingperm') + ' `MANAGE_ROLES`' );
		}
		else if ( !msg.onlyVerifyCommand ) this.LINK(lang, msg, line, wiki);
		return;
	}
	
	db.query( 'SELECT logchannel, flags, onsuccess, onmatch, role, editcount, postcount, usergroup, accountage, rename FROM verification LEFT JOIN verifynotice ON verification.guild = verifynotice.guild WHERE verification.guild = $1 AND channel LIKE $2 ORDER BY configid ASC', [msg.guild.id, '%|' + msg.channel.id + '|%'] ).then( ({rows}) => {
		if ( !rows.length ) {
			if ( msg.onlyVerifyCommand ) return;
			return msg.replyMsg( lang.get('verify.missing') + ( msg.isAdmin() ? '\n`' + ( patreons[msg.guild.id] || process.env.prefix ) + 'verification`' : '' ) );
		}
		
		if ( wiki.hasOAuth2() && process.env.dashboard ) {
			let oauth = [wiki.hostname + wiki.pathname.slice(0, -1)];
			if ( wiki.isWikimedia() ) oauth.push('wikimedia');
			if ( wiki.isMiraheze() ) oauth.push('miraheze');
			if ( process.env['oauth_' + ( oauth[1] || oauth[0] )] && process.env['oauth_' + ( oauth[1] || oauth[0] ) + '_secret'] ) {
				let state = `${oauth[0]} ${global.shardId}` + Date.now().toString(16) + randomBytes(16).toString('hex') + ( oauth[1] ? ` ${oauth[1]}` : '' );
				while ( oauthVerify.has(state) ) {
					state = `${oauth[0]} ${global.shardId}` + Date.now().toString(16) + randomBytes(16).toString('hex') + ( oauth[1] ? ` ${oauth[1]}` : '' );
				}
				oauthVerify.set(state, {
					state, wiki: wiki.href,
					channel: msg.channel,
					user: msg.author.id
				});
				msg.client.shard.send({id: 'verifyUser', state});
				let oauthURL = wiki + 'rest.php/oauth2/authorize?' + new URLSearchParams({
					response_type: 'code', redirect_uri: new URL('/oauth/mw', process.env.dashboard).href,
					client_id: process.env['oauth_' + ( oauth[1] || oauth[0] )], state
				}).toString();
				return msg.member.send( lang.get('verify.oauth_message_dm', escapeFormatting(msg.guild.name)) + '\n<' + oauthURL + '>', {
					components: [
						{
							type: 1,
							components: [
								{
									type: 2,
									style: 5,
									label: lang.get('verify.oauth_button'),
									emoji: {id: null, name: '🔗'},
									url: oauthURL,
									disabled: false
								}
							]
						}
					]
				} ).then( message => {
					msg.reactEmoji('📩');
					allowDelete(message, msg.author.id);
					msg.delete({timeout: 60000, reason: lang.get('verify.footer')}).catch(log_error);
				}, error => {
					if ( error?.code === 50007 ) { // CANNOT_MESSAGE_USER
						return msg.replyMsg( lang.get('verify.oauth_private') );
					}
					log_error(error);
					msg.reactEmoji('error');
				} );
			}
		}
		
		var username = args.join(' ').replace( /_/g, ' ' ).trim().replace( /^<\s*(.*)\s*>$/, '$1' ).replace( /^@/, '' ).split('#')[0].substring(0, 250).trim();
		if ( /^(?:https?:)?\/\/([a-z\d-]{1,50})\.(?:gamepedia\.com\/|(?:fandom\.com|wikia\.org)\/(?:[a-z-]{1,8}\/)?(?:wiki\/)?)/.test(username) ) {
			username = decodeURIComponent( username.replace( /^(?:https?:)?\/\/([a-z\d-]{1,50})\.(?:gamepedia\.com\/|(?:fandom\.com|wikia\.org)\/(?:[a-z-]{1,8}\/)?(?:wiki\/)?)/, '' ) );
		}
		if ( wiki.isGamepedia() ) username = username.replace( /^userprofile\s*:\s*/i, '' );
		
		if ( !username.trim() ) {
			args[0] = line.split(' ')[0];
			if ( args[0] === 'verification' ) args[0] = ( lang.localNames.verify || 'verify' );
			return this.help(lang, msg, args, line, wiki);
		}
		msg.reactEmoji('⏳').then( reaction => {
			verify(lang, msg.channel, msg.member, username, wiki, rows).then( result => {
				if ( result.oauth.length ) {
					let state = `${result.oauth[0]} ${global.shardId}` + Date.now().toString(16) + randomBytes(16).toString('hex') + ( result.oauth[1] ? ` ${result.oauth[1]}` : '' );
					while ( oauthVerify.has(state) ) {
						state = `${result.oauth[0]} ${global.shardId}` + Date.now().toString(16) + randomBytes(16).toString('hex') + ( result.oauth[1] ? ` ${result.oauth[1]}` : '' );
					}
					oauthVerify.set(state, {
						state, wiki: wiki.href,
						channel: msg.channel,
						user: msg.author.id
					});
					msg.client.shard.send({id: 'verifyUser', state});
					let oauthURL = wiki + 'rest.php/oauth2/authorize?' + new URLSearchParams({
						response_type: 'code', redirect_uri: new URL('/oauth/mw', process.env.dashboard).href,
						client_id: process.env['oauth_' + ( result.oauth[1] || result.oauth[0] )], state
					}).toString();
					msg.member.send( lang.get('verify.oauth_message_dm', escapeFormatting(msg.guild.name)) + '\n<' + oauthURL + '>', {
						components: [
							{
								type: 1,
								components: [
									{
										type: 2,
										style: 5,
										label: lang.get('verify.oauth_button'),
										emoji: {id: null, name: '🔗'},
										url: oauthURL,
										disabled: false
									}
								]
							}
						]
					} ).then( message => {
						msg.reactEmoji('📩');
						allowDelete(message, msg.author.id);
						msg.delete({timeout: 60000, reason: lang.get('verify.footer')}).catch(log_error);
					}, error => {
						if ( error?.code === 50007 ) { // CANNOT_MESSAGE_USER
							return msg.replyMsg( lang.get('verify.oauth_private') );
						}
						log_error(error);
						msg.reactEmoji('error');
					} );
				}
				else if ( result.reaction ) msg.reactEmoji(result.reaction);
				else {
					var options = {embed: result.embed, components: []};
					if ( result.add_button ) options.components.push({
						type: 1,
						components: [
							{
								type: 2,
								style: 1,
								label: lang.get('verify.button_again'),
								emoji: {id: null, name: '🔂'},
								custom_id: 'verify_again',
								disabled: false
							}
						]
					});
					if ( result.send_private ) {
						let dmEmbed = new MessageEmbed(options.embed);
						dmEmbed.fields.forEach( field => {
							field.value = field.value.replace( /<@&(\d+)>/g, (mention, id) => {
								if ( !msg.guild.roles.cache.has(id) ) return mention;
								return '@' + msg.guild.roles.cache.get(id)?.name;
							} );
						} );
						msg.member.send( msg.channel.toString() + '; ' + result.content, {embed: dmEmbed, components: []} ).then( message => {
							msg.reactEmoji('📩');
							allowDelete(message, msg.author.id);
							msg.delete({timeout: 60000, reason: lang.get('verify.footer')}).catch(log_error);
						}, error => {
							if ( error?.code === 50007 ) { // CANNOT_MESSAGE_USER
								return msg.replyMsg( result.content, options, false, false );
							}
							log_error(error);
							msg.reactEmoji('error');
						} );
						if ( result.logging.channel && msg.guild.channels.cache.has(result.logging.channel) ) {
							msg.guild.channels.cache.get(result.logging.channel).send(result.logging.content, {
								embed: result.logging.embed,
								allowedMentions: {parse: []}
							}).catch(log_error);
						}
					}
					else msg.replyMsg( result.content, options, false, false ).then( message => {
						if ( !result.logging.channel || !msg.guild.channels.cache.has(result.logging.channel) ) return;
						if ( message ) {
							if ( result.logging.embed ) result.logging.embed.addField(message.url, '<#' + msg.channel.id + '>');
							else result.logging.content += '\n<#' + msg.channel.id + '> – <' + message.url + '>';
						}
						msg.guild.channels.cache.get(result.logging.channel).send(result.logging.content, {
							embed: result.logging.embed,
							allowedMentions: {parse: []}
						}).catch(log_error);
					} );
				}
				if ( reaction ) reaction.removeEmoji();
			}, error => {
				console.log( '- Error during the verifications: ' + error );
				msg.replyMsg( lang.get('verify.error_reply'), {}, false, false ).then( message => {
					if ( message ) message.reactEmoji('error');
				} );
			} );
		} );
	}, dberror => {
		console.log( '- Error while getting the verifications: ' + dberror );
		msg.replyMsg( lang.get('verify.error_reply'), {}, false, false ).then( message => {
			if ( message ) message.reactEmoji('error');
		} );
	} );
}

module.exports = {
	name: 'verify',
	everyone: true,
	pause: false,
	owner: false,
	run: cmd_verify
};