/*\
title: $:/plugins/tiddlywiki/twitter-archivist/archivist.js
type: application/javascript
module-type: utils

Utility class for manipulating Twitter archives

\*/
(function(){

/*jslint node: true, browser: true */
/*global $tw: false */
"use strict";

function TwitterArchivist(options) {
	options = options || {};
	this.source = options.source;
}

TwitterArchivist.prototype.loadArchive = async function(options) {
	options = options || {};
	const wiki = options.wiki;
	await this.source.init();
	// Process the manifest and profile
	const manifestData = await this.loadTwitterJsData("data/manifest.js","window.__THAR_CONFIG = ",""),
		profileData = await this.loadTwitterJsData("data/profile.js","window.YTD.profile.part0 = ",""),
		accountData = await this.loadTwitterJsData("data/account.js","window.YTD.account.part0 = ",""),
		username = manifestData.userInfo.userName,
		user_id = manifestData.userInfo.accountId;
	wiki.addTiddler({
		title: "Twitter Archive for @" + username,
		icon: "$:/core/images/twitter",
		color: "#1D9CF0",
		tags: "$:/tags/TwitterArchive",
		user_id: user_id,
		username: username,
		displayname: manifestData.userInfo.displayName,
		generation_date: $tw.utils.stringifyDate(new Date(manifestData.archiveInfo.generationDate)),
		account_created_date: $tw.utils.stringifyDate(new Date(accountData[0].account.createdAt)),
		bio: profileData[0].profile.description.bio,
		website: profileData[0].profile.description.website,
		location: profileData[0].profile.description.location
	});
	// Process the media
	await this.source.processFiles("data/tweets_media","base64",function(mediaItem) {
		var ext = mediaItem.filename.split(".").slice(-1)[0];
		if("jpg png".split(" ").indexOf(ext) !== -1) {
			var extensionInfo = $tw.utils.getFileExtensionInfo("." + ext),
				type = extensionInfo ? extensionInfo.type : null;
			wiki.addTiddler({
				title: "Tweet Media - " + mediaItem.filename,
				tags: "$:/tags/TweetMedia",
				status_id: mediaItem.filename.split("-")[0],
				text: mediaItem.contents,
				type: type
			});
		}
	});
	// Process the favourites
	const likeData = await this.loadTwitterJsData("data/like.js","window.YTD.like.part0 = ","");
	$tw.utils.each(likeData,function(like) {
		// Create the tweet tiddler
		var tiddler = {
			title: "Tweet - " + like.like.tweetId,
			text: "\\rules only html entity extlink\n" + (like.like.fullText || "").replace("\n","<br>"),
			status_id: like.like.tweetId,
			liked_by: user_id,
			tags: "$:/tags/Tweet"
		};
		wiki.addTiddler(tiddler);
	});
	// Process the tweets
	const tweetData = await this.loadTwitterJsData("data/tweets.js","window.YTD.tweets.part0 = ","");
	$tw.utils.each(tweetData,function(tweet) {
		// Compile the tags for the tweet
		var tags = ["$:/tags/Tweet"];
		// Accumulate the replacements/insertions to the text as an array of {startPos:,endPos:,fnTransform:}
		var modifications = [];
		// Modifications for mentions
		var mentions = [];
		$tw.utils.each(tweet.tweet.entities.user_mentions,function(mention) {
			var title = "Tweeter - " + mention.id_str;
			tags.push(title);
			mentions.push(mention.id_str);
			wiki.addTiddler({
				title: title,
				screenname: "@" + mention.screen_name,
				tags: "$:/tags/Tweeter",
				user_id: mention.id_str,
				name: mention.name
			});
			modifications.push({
				startPos: parseInt(mention.indices[0],10),
				endPos: parseInt(mention.indices[1],10),
				fnTransform: function(text) {
					return "<$link to=\"" + title + "\">" +
						$tw.utils.htmlEncode(text.substring(mention.indices[0],mention.indices[1])) +
						"</$link>";
				}
			});
		});
		// Modifications for URLs
		$tw.utils.each(tweet.tweet.entities.urls,function(urlInfo) {
			modifications.push({
				startPos: parseInt(urlInfo.indices[0],10),
				endPos: parseInt(urlInfo.indices[1],10),
				fnTransform: function(text) {
					return "<a href=\"" + urlInfo.expanded_url + "\" rel=\"noopener noreferrer\" target=\"_blank\">" +
						$tw.utils.htmlEncode(urlInfo.display_url) +
						"</a>";
				}
			});
		});
		// Modifications for hashtags
		$tw.utils.each(tweet.tweet.entities.hashtags,function(hashtag) {
			var title = "#" + hashtag.text;
			tags.push(title);
			wiki.addTiddler({
				title: title,
				hashtag: hashtag.text,
				tags: "$:/tags/Hashtag"
			});
			modifications.push({
				startPos: parseInt(hashtag.indices[0],10),
				endPos: parseInt(hashtag.indices[1],10),
				fnTransform: function(text) {
					return "<$link to=\"" + title + "\">" +
						"#" + $tw.utils.htmlEncode(hashtag.text) +
						"</$link>";	
				}
			});
		});
		// Sort the modifications by start position
		modifications.sort(function(a,b) {
			return a.startPos - b.startPos;
		});
		// Apply the modifications in reverse order
		var rawText = tweet.tweet.full_text,
			posText = 0,
			chunks = [];
		$tw.utils.each(modifications,function(modification) {
			// Process any text before the modification
			if(modification.startPos > posText) {
				chunks.push($tw.utils.htmlEncode(rawText.substring(posText,modification.startPos)));
			}
			// Process the modification
			chunks.push(modification.fnTransform(rawText));
			// Adjust the position
			posText = modification.endPos;
		});
		// Process any remaining text
		if(posText < rawText.length) {
			chunks.push($tw.utils.htmlEncode(rawText.substring(posText)));
		}
		// Concatenate the chunks and replace newlines with <br>
		var text = chunks.join("").replace("\n","<br>");
		// Create the tweet tiddler
		var tiddler = {
			title: "Tweet - " + tweet.tweet.id_str,
			text: "\\rules only html entity extlink\n" + text,
			status_id: tweet.tweet.id_str,
			user_id: user_id,
			favorite_count: tweet.tweet.favorite_count,
			retweet_count: tweet.tweet.retweet_count,
			tags: tags,
			created: $tw.utils.stringifyDate(new Date(tweet.tweet.created_at)),
			modified: $tw.utils.stringifyDate(new Date(tweet.tweet.created_at))
		};
		if(tweet.tweet.in_reply_to_status_id_str) {
			tiddler.in_reply_to_status_id = tweet.tweet.in_reply_to_status_id_str;
		}
		if(mentions.length > 0) {
			tiddler.mention_user_ids = $tw.utils.stringifyList(mentions);
		}
		wiki.addTiddler(tiddler);
	});
};

TwitterArchivist.prototype.loadTwitterJsData = async function(filePath,prefix,suffix) {
	var tweetFileData = await this.source.loadTwitterJsData(filePath);
	if(prefix) {
		if(tweetFileData.slice(0,prefix.length) !== prefix) {
			throw "Reading Twitter JS file " + filePath + " missing prefix '" + prefix + "'";
		}
		tweetFileData = tweetFileData.slice(prefix.length);
	}
	if(suffix) {
		if(tweetFileData.slice(-suffix.length) !== suffix) {
			throw "Reading Twitter JS file " + filePath + " missing suffix '" + suffix + "'";
		}
		tweetFileData = tweetFileData.slice(0,tweetFileData.length - suffix.length);
	}
	return JSON.parse(tweetFileData);
};

function TwitterArchivistSourceNodeJs(options) {
	options = options || {};
	this.archivePath = options.archivePath;
}

TwitterArchivistSourceNodeJs.prototype.init = async function() {
};

TwitterArchivistSourceNodeJs.prototype.processFiles = async function(dirPath,encoding,callback) {
	var fs = require("fs"),
		path = require("path"),
		dirPath = path.resolve(this.archivePath,dirPath),
		filenames = fs.readdirSync(dirPath);
	$tw.utils.each(filenames,function(filename) {
		callback({
			filename: filename,
			contents: fs.readFileSync(path.resolve(dirPath,filename),encoding)
		});
	});
};

TwitterArchivistSourceNodeJs.prototype.loadTwitterJsData = async function(filePath) {
	var fs = require("fs"),
		path = require("path");
	return fs.readFileSync(path.resolve(this.archivePath,filePath),"utf8");
};

function TwitterArchivistSourceBrowser(options) {
	options = options || {};
}

TwitterArchivistSourceBrowser.prototype.init = async function() {
	// Open directory
	this.rootDirHandle = await window.showDirectoryPicker();
};

TwitterArchivistSourceBrowser.prototype.processFiles = async function(dirPath,encoding,callback) {
	const dirHandle = await this.walkDirectory(dirPath.split("/"));
	for await (const [filename, fileHandle] of dirHandle.entries()) {
		const contents = await fileHandle.getFile();
		callback({
			filename: filename,
			contents: arrayBufferToBase64(await contents.arrayBuffer())
		});
	}
};

TwitterArchivistSourceBrowser.prototype.loadTwitterJsData = async function(filePath) {
	const filePathParts = filePath.split("/");
	const dirHandle = await this.walkDirectory(filePathParts.slice(0,-1));
	const fileHandle = await dirHandle.getFileHandle(filePathParts.slice(-1)[0]);
	const contents = await fileHandle.getFile();
	return await contents.text();
};

TwitterArchivistSourceBrowser.prototype.walkDirectory = async function(arrayDirectoryEntries) {
	var entries = arrayDirectoryEntries.slice(0),
		dirHandle = this.rootDirHandle;
	while(entries.length > 0) {
		dirHandle = await dirHandle.getDirectoryHandle(entries[0]);
		entries.shift();
	}
	return dirHandle;
};

// Thanks to MatheusFelipeMarinho
// https://github.com/MatheusFelipeMarinho/venom/blob/43ead0bfffa57a536a5cff67dd909e55da9f0915/src/lib/wapi/helper/array-buffer-to-base64.js#L55
function arrayBufferToBase64(arrayBuffer) {
	var base64 = '';
	var encodings =
		'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';

	var bytes = new Uint8Array(arrayBuffer);
	var byteLength = bytes.byteLength;
	var byteRemainder = byteLength % 3;
	var mainLength = byteLength - byteRemainder;

	var a, b, c, d;
	var chunk;

	// Main loop deals with bytes in chunks of 3
	for (var i = 0; i < mainLength; i = i + 3) {
		// Combine the three bytes into a single integer
		chunk = (bytes[i] << 16) | (bytes[i + 1] << 8) | bytes[i + 2];

		// Use bitmasks to extract 6-bit segments from the triplet
		a = (chunk & 16515072) >> 18; // 16515072 = (2^6 - 1) << 18
		b = (chunk & 258048) >> 12; // 258048   = (2^6 - 1) << 12
		c = (chunk & 4032) >> 6; // 4032     = (2^6 - 1) << 6
		d = chunk & 63; // 63       = 2^6 - 1

		// Convert the raw binary segments to the appropriate ASCII encoding
		base64 += encodings[a] + encodings[b] + encodings[c] + encodings[d];
	}

	// Deal with the remaining bytes and padding
	if (byteRemainder == 1) {
		chunk = bytes[mainLength];

		a = (chunk & 252) >> 2; // 252 = (2^6 - 1) << 2

		// Set the 4 least significant bits to zero
		b = (chunk & 3) << 4; // 3   = 2^2 - 1

		base64 += encodings[a] + encodings[b] + '==';
	} else if (byteRemainder == 2) {
		chunk = (bytes[mainLength] << 8) | bytes[mainLength + 1];

		a = (chunk & 64512) >> 10; // 64512 = (2^6 - 1) << 10
		b = (chunk & 1008) >> 4; // 1008  = (2^6 - 1) << 4

		// Set the 2 least significant bits to zero
		c = (chunk & 15) << 2; // 15    = 2^4 - 1

		base64 += encodings[a] + encodings[b] + encodings[c] + '=';
	}
	return base64;
}

exports.TwitterArchivist = TwitterArchivist;
exports.TwitterArchivistSourceNodeJs = TwitterArchivistSourceNodeJs;
exports.TwitterArchivistSourceBrowser = TwitterArchivistSourceBrowser;

})();