/*
 * decaffeinate suggestions:
 * DS101: Remove unnecessary use of Array.from
 * DS102: Remove unnecessary code created because of implicit returns
 * DS207: Consider shorter variations of null checks
 * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
 */
let TikzManager;
const fs = require("fs");
const Path = require("path");
const ResourceWriter = require("./ResourceWriter");
const SafeReader = require("./SafeReader");
const logger = require("logger-sharelatex");

// for \tikzexternalize or pstool to work the main file needs to match the
// jobname.  Since we set the -jobname to output, we have to create a
// copy of the main file as 'output.tex'.

module.exports = (TikzManager = {

	checkMainFile(compileDir, mainFile, resources, callback) {
		// if there's already an output.tex file, we don't want to touch it
		if (callback == null) { callback = function(error, needsMainFile) {}; }
		for (let resource of Array.from(resources)) {
			if (resource.path === "output.tex") {
				logger.log({compileDir, mainFile}, "output.tex already in resources");
				return callback(null, false);
			}
		}
		// if there's no output.tex, see if we are using tikz/pgf or pstool in the main file
		return ResourceWriter.checkPath(compileDir, mainFile, function(error, path) {
			if (error != null) { return callback(error); }
			return SafeReader.readFile(path, 65536, "utf8", function(error, content) {
				if (error != null) { return callback(error); }
				const usesTikzExternalize = (content != null ? content.indexOf("\\tikzexternalize") : undefined) >= 0;
				const usesPsTool = (content != null ? content.indexOf("{pstool}") : undefined) >= 0;
				logger.log({compileDir, mainFile, usesTikzExternalize, usesPsTool}, "checked for packages needing main file as output.tex");
				const needsMainFile = (usesTikzExternalize || usesPsTool);
				return callback(null, needsMainFile);
			});
		});
	},

	injectOutputFile(compileDir, mainFile, callback) {
		if (callback == null) { callback = function(error) {}; }
		return ResourceWriter.checkPath(compileDir, mainFile, function(error, path) {
			if (error != null) { return callback(error); }
			return fs.readFile(path, "utf8", function(error, content) {
				if (error != null) { return callback(error); }
				logger.log({compileDir, mainFile}, "copied file to output.tex as project uses packages which require it");
				// use wx flag to ensure that output file does not already exist
				return fs.writeFile(Path.join(compileDir, "output.tex"), content, {flag:'wx'}, callback);
			});
		});
	}
});