/*

	Copyright (c) 2020, 2023, The Unified Company.

	This code is part of Unify.

	This program is free software; you can redistribute it and/or modify
	it under the terms of the ESA Software Community License - Strong Copyleft LICENSE,
	as published by the ESA.
	See the ESA Software Community License - Strong Copyleft LICENSE, for more details.

	https://unifyjs.org 

*/


export default class cacheDisabler{

	randomString	= String( Math.floor(Math.random() * 1000 )).padStart(4, '0');

	trimParts( parts ) {

		return parts.filter( function( entry ) { return entry.trim() != ''; });

	}

	removePreviousRandomNumber( parts, overrideSplit ) {

		var overrideSplit 	= parts[3].split("?");



		if( overrideSplit[1] ) {

			// ';
			if( parts[3].includes(";") ) {

				var lastPart 		= overrideSplit[1].slice( overrideSplit[1].length-2, overrideSplit[1].length );


			// '
			} else {

				var lastPart 		= overrideSplit[1].slice( overrideSplit[1].length-1, overrideSplit[1].length );

			}

			
			overrideSplit[1] 	= lastPart;

			parts[3] 			= overrideSplit.join("")


		}

		return parts;

	}

	injectWithoutSemicolon( parts, index, random, part ) {

		var l				= part.length;

		parts[ index ] 		= part.slice( 0, l - 1 ) + random + part.slice( l - 1, l );

	}

	injectWithSemicolon( parts, index, random, part ) {

		var l				= part.length;

		parts[ index ] 		= part.slice( 0, l - 2 ) + random + part.slice( l - 2, l );

	}

	injectRandomNumber( parts ) {

		var randomString	= "?disableCache=" + this.randomString;

        var urlPartIndex 	= parts.length - 1;

        var urlPart 		= parts[ urlPartIndex ];

		if( urlPart.includes(";") ) {

			this.injectWithSemicolon( parts, urlPartIndex, randomString, urlPart );

		} else {

			this.injectWithoutSemicolon( parts, urlPartIndex, randomString, urlPart );

		}

		return parts;

	}

	parseImportLine( lineWords ) {

		lineWords 				= this.trimParts( lineWords );
		
		lineWords				= this.removePreviousRandomNumber( lineWords );

		lineWords				= this.injectRandomNumber( lineWords );

		return lineWords;

	}

	parseLine( lines, i ) {

		var stripped 	= lines[i].replaceAll("\t", " ");

		var parts		= stripped.split(" ");

		if( parts.includes("import") ) {

			parts = this.parseImportLine( parts );

		}

		lines[i] = parts.join(" ");

	}

	parseSource( source, path ) {

		source		= source.replaceAll("\r", "\n");

		var lines 	= source.split("\n");

		for ( var i = 0; i < lines.length; i++ ) {

			this.parseLine( lines, i );


		}

		var body = lines.join("\n");

		return body;

	}

}