/*

	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 

*/

import file					from './file.js';
	
import path 				from 'path';

import fs 					from 'fs-extra';

import fse					from "fs-extra";

import tools				from '../unify/tools.js';

import multiExtender		from './multiExtender.js';

import objectParser			from './objectParser.js';

import cacheDisabler		from './cacheDisabler.js';


export default class filemanager{

	applications 			= new Array();

	files					= new Array();

	directories				= new Array();

	replacements			= new Array();

	cores					= new Array();

	pragmas					= new Array();

	allFiles				= new Array();


	storeSource				= true;

	cache_folder_depth		= 0;


	multiExtender			= new multiExtender();

	objectParser			= new objectParser();

	cacheDisabler			= new cacheDisabler();


	crossPlatformPath( path ) {

		return tools.slash( path );

	}

	constructor( cache_directory ) {

		if( !cache_directory ) {

			return false;

		}

		this.cache_directory = this.crossPlatformPath( cache_directory );

		this.writeRandomString()

	}

	async writeRandomString() {

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

		this.cacheDisabler.randomString = this.randomString;

		await fs.writeFileSync( "./framework/configs/randomString.json", this.randomString );

	}

	routeDirectory( directory, relativeDirectory ) {

		var path		= "framework";

		var subPath		= "unify";

		var files 		= fs.readdirSync( directory );

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

			var fileName 		= files[i];

			var fileLocation	= relativeDirectory + fileName;

			this.replace( fileLocation );

		}

	}

	addCustomReplacements() {

		this.addReplacement( "/elements/", 		"/"+this.cache_directory+"elements/");

		this.addReplacement( "/user/", 			"/"+this.cache_directory+"user/" );

		this.replace( "/engine/");

		this.replace( "/3rdparty/");

		this.routeDirectory( "framework/unify", "/unify/" );

		this.routeDirectory( "framework/server", "/server/" );

		this.routeDirectory( "framework/client", "/client/" );

		this.routeDirectory( "framework/unify/sql", "/unify/sql/" );

		this.routeDirectory( "framework/unify/math", "/unify/math/" );

	}

	replace( source ) {

		var target	= "/framework" + source;

		this.addReplacement(source, target);

	}

	addReplacement( source, target ) {
	
		var replacement = new Object();
		
		replacement.source 		= source;

		replacement.target 		= target;

		this.replacements.push( replacement );
	
	}

	readFileListCache( filesJson ) {

		this.files = filesJson;

	}

	getFiles() {

		return this.files;

	}

	writeFileListCache() {

		var json = "export default " + JSON.stringify( this.files  ) + ";";

		fs.writeFileSync( "./framework/configs/files.js", json  );


		var json = "export default " + JSON.stringify( this.applications  ) + ";";

		fs.writeFileSync( "./framework/configs/applications.js", json  );

	}

	async updateCache() {

		await this.findApplicationFiles( "./application");

		await this.emptyCacheDirectory();

		await this.createDirectories();

		await this.writeFiles();

	}
	
	addReplacement( source, target ) {
	
		var replacement = new Object();
		
		replacement.source 		= source;

		replacement.target 		= target;
	
		this.replacements.push( replacement );
	
	}
	
	async createDir( path ) {
	
		fse.ensureDirSync( path );
	
	}

	async emptyCacheDirectory() {

		fs.emptyDirSync( this.cache_directory );

	}

	async createDirectory( directory ) {

		if( this.temporary_cache_directory ) {

			//console.log(path.resolve( this.temporary_cache_directory + directory ));

			fs.ensureDirSync( path.resolve( this.temporary_cache_directory + directory ) );

		} else {

			fs.ensureDirSync( path.resolve( this.cache_directory + directory ) );

		}

	}

	async createDirectories() {
	
		var directories = this.directories.reverse();

		for( var c = 0; c < directories.length; c++ ) {
		
			var directory = directories[c];
			
			this.createDirectory( directory );
			
		}
		
		return true;
	
	}	
		
	definePragma( pragma ) {

		this.pragmas.push( pragma );

	}

	cleanURL( source ) {

		var token	= "//";

		for ( var i = 0; i < 4; i++ ) {
			
			token += "/";

			source = source.replaceAll( token, "/" );

		}

		source = source.replaceAll('..//', '../');

		return source;

	}

	definePragmas( source ) {

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

			var pragma = this.pragmas[i];

			source = "\n\n#define " + pragma.toUpperCase() + " \n\n" + source;

		}

		return source;

	}

	writeFileToDisk( source, path, filename ) {

		if( this.temporary_cache_directory ) {

			fs.writeFileSync( this.temporary_cache_directory + path + "/" + filename, source );

		} else {

			fs.writeFileSync( this.cache_directory + path + "/" + filename, source );

		}

	}

	composeFile( file, side ) {

		var path			= file.path;

		var filename		= file.name;

		var source			= file.parsedSource;

		var customMethodPreFixes = new Array("node", "state");
		
		if( source ) {

			source = this.cleanURL( source );	

			source = this.objectParser.compose( source, path + "/" + filename, customMethodPreFixes );

			if( side == "client" ) {

				source = this.cacheDisabler.parseSource( source, path + "/" + filename );

			}

			source 	= this.multiExtender.enableMultiExtend( source, file.depth );

			source	= this.definePragmas( source );

			this.writeFileToDisk( source, path, filename );

		}

	}

	async writeFiles( side ) {

		var files = this.files;

		for( var c = 0; c < files.length; c++ ) {
		
			var file 		= files[c];

			this.composeFile( file, side );

		}

	}
		
	async renewCache( directory, files ) {

		for( var c = 0; c < files.length; c++ ) {
		
			var filename	= files[c];

			var filePath 	= this.cache_directory + "/" + filename;

			console.log( "Refresh cache:", directory, filename );

			filePath 			= path.resolve( filePath )

			var source 			= await fs.readFileSync( filePath, 'utf8');
			
			source				= this.cacheDisabler.parseSource( source );

			await fs.writeFileSync( filePath, source );

		}

	}

	async findApplicationFiles( directory, depth = 0, parentFile ) {

		var files = await fs.readdirSync( directory );

		for( var c = 0; c<files.length; c++ ) {
		
			var filename	= files[c];

			if( filename != ".DS_Store" ) {
				
				var newFile = await this.processFile( filename, directory, depth, parentFile );
				
				if( parentFile ) {

					parentFile.add( newFile );
				
				}

			}

		}
		
		return parentFile;

	}
	
	normalizePath( directory ) {

		if( process.platform == "win32" ) {

			var separator = "\\";

		} else {

			var separator = "/";

		}

		var dirParts 	= directory.split( separator );

		dirParts.shift();

		return dirParts.join( separator );

	}

	writeCacheHistory() {

		fs.writeFileSync( path.resolve("./framework/cache/platforms/cachedFiles.json"), JSON.stringify( this.allFiles ) );

	}

	filterFile( file, previousFiles, index ) {

		var name			= file.name;

		var searchIndex 	= previousFiles.findIndex( ( file ) => file.name == name );

		if( searchIndex != -1 ) {

			var previousFile	= previousFiles[ searchIndex ];

			if( previousFile.dateModified.toString() == file.dateModified.toString() ) {

				delete this.files[ index ]

			}
			
		}

	}

	filterFiles( source ) {

		var previousFiles	= JSON.parse( source );

		var files 			= this.files;

		for ( var index = 0; index < files.length; index++ ) {
			
			var file 			= files[ index ];

			this.filterFile( file, previousFiles, index )

		}

	}

	filterModified() {

		if(  !fs.existsSync( path.resolve("./framework/cache/platforms/cachedFiles.json") ) ) {

			return false;
		}

		var source		= fs.readFileSync( path.resolve("./framework/cache/platforms/cachedFiles.json"), "utf8" );

		if( !source ) {

			return false;

		}

		this.filterFiles( source );

		this.files = this.files.filter( n => n );

	}

	getFileType( stats ) {

		if( stats.isDirectory() ) {

			return "directory";

		}

		if( stats.isFile() ) {

			return "file";

		}

	}

	createFileObject( directory, filename, depth ) {

		var filePath			= path.join( directory, filename );

		var stats				= fs.statSync( filePath );

		
		var newFile 			= new file();

		newFile.name			= filename;

		newFile.path			= this.normalizePath( directory );

		newFile.filePath		= filePath;

		newFile.depth			= depth;

		newFile.dateModified	= stats.ctime.toString();

		newFile.type			= this.getFileType( stats );


		return newFile;

	}

	async processDirectory( newFile, parentFile ) {

		const excludeDirectorys	= new Array("assets", ".DS_Store");	
		
		if( !excludeDirectorys.includes( newFile.name ) ) {

			if( parentFile ) {
			
				await this.findApplicationFiles( newFile.filePath, newFile.depth + 1, newFile );
			
			} else {
			
				await this.findApplicationFiles( newFile.filePath, newFile.depth + 1 );
				
				this.directories.push( this.normalizePath( newFile.filePath ) );
			
			}

		}

	}

	async processNormalFile( newFile, directory, parentFile ) {

		if( newFile.name == "application.js" ) {

			if( !parentFile ) {
				
				var fileThree = await this.findApplicationFiles(  directory, newFile.depth + 1, newFile );

				this.applications.push( fileThree );

			}
		} 
		
		if( this.storeSource ) {

			this.processSource( newFile, newFile.filePath, newFile.depth );

		}

	}

	async handleFile( newFile, parentFile, directory ) {

		var fileParts			= newFile.name.split(".");
		
		if( newFile.type == "directory" ) {

			await this.processDirectory( newFile, parentFile );
			
		} else {

			await this.processNormalFile( newFile, directory, parentFile );

		}

	}

	async processFile( filename, directory, depth, parentFile = false ) {

		var newFile				= this.createFileObject( directory, filename, depth );

		await this.handleFile( newFile, parentFile, directory, depth );


		if( !parentFile ) {
		
			this.files.push( newFile );

			this.allFiles.push( newFile )
			
		}
		
		return newFile;

	}

	async processSource( newFile, filePath, depth ) {

		newFile.source			= await fs.readFileSync( filePath, 'utf8' );

		var source 				= this.cleanURL( newFile.source );	

		newFile.source 			= source;

		newFile.parsedSource	= this.parseSource( source , depth );

		return file;

	}

	parseSourceLine( code, replacement, depth ) {

		var source 		= replacement.source;

		var target 		= replacement.target;

		
		var relativeTarget 	=  this.computeRelativePath( depth ) + target;


		code 	= code.replaceAll( '"' + source, '"' + relativeTarget );

		code 	= code.replaceAll( "'" + source, "'" + relativeTarget );


		return code;
	}

	parseSource( code, depth ) {

		code	= "\n\nimport extender from '/unify/extender.js';\n\n " + code;

		var replacements = this.replacements;
		
		for( var c = 0; c < replacements.length;c++ ) {
		
			var replacement = replacements[c];
			

			code = this.parseSourceLine( code, replacement, depth );

		}

		code = this.cleanURL( code );
		
		return code;
	
	}
	
	computeRelativePath( depth ){

		var backString 	= "";

		var path		= this.cache_directory;

		var parts		= path.split("/")

		parts			= parts.filter(n => n)


		if( parts[0] == "." ) {

			parts.shift();

		}

		var totalDepth	= parts.length + depth;

		for (var i = 0; i < totalDepth; i++) {

			backString += "../";

		}

		return backString;
	
	}

}