const fs = require( 'fs' );
const path = require( 'path' );

const pkg = require( '../package.json' );
const buildConfig = require( '../build-config.json' );

const banner = `/*!
* ${pkg.nativeName} v${pkg.version} (${pkg.homepage})
* Copyright 2011-${new Date().getFullYear()} ${pkg.author}
* License: Commercial. More details: ${pkg.license}
*/`;

function applyBanner ( directoryPath, banner, fileExtension, done ) {
	fs.readdir( directoryPath, ( err, files ) => {
		if ( err ) {
			console.error( 'Error:', err );
			return done( err );
		}

		let pending = files.length;
		if ( pending === 0 ) { return done(); } // No files, complete immediately

		files.forEach( ( file ) => {
			var filePath = path.join( directoryPath, file );
			fs.stat( filePath, ( err, stats ) => {
				if ( err ) {
					console.error( 'Error:', err );
					done( err );
					return;
				}

				if ( stats.isDirectory() ) {
					// Recursively process directories
					applyBanner( filePath, banner, fileExtension, ( err ) => {
						if ( --pending === 0 ) { done( err ); }
					});
				} else if ( path.extname( file ) === fileExtension && file.endsWith( '.min' + fileExtension ) ) {
					// Process files with specified extension
					fs.readFile( filePath, 'utf8', ( err, data ) => {
						if ( err ) {
							console.error( 'Error reading file:', err );
							if ( --pending === 0 ) { done( err ); }
							return;
						}

						var newData = banner + data;
						fs.writeFile( filePath, newData, 'utf8', ( err ) => {
							if ( err ) {
								console.error( 'Error writing file:', err );
								if ( --pending === 0 ) { done( err ); }
								return;
							}

							if ( --pending === 0 ) { done(); }
						});
					});
				} else {
					if ( --pending === 0 ) { done(); }
				}
			});
		});
	});
}

function addCssBanner ( done ) {
	applyBanner( buildConfig.globalOptions.less.destPath, banner, '.css', done );
}

module.exports = {
	addCssBanner
};