some more progress

frontend/src/appleMusicRoutes.js

@@ -8,6 +8,28 @@
 */
 
 const path = require( 'path' );
+const dialog = require( 'electron' ).dialog;
+
+const analyzeFile = ( filepath ) => {
+    return new Promise( ( resolve, reject ) => {
+        if ( filepath.includes( '.csv' ) ) {
+            // This will assume that line #1 will be song #1 in the file list
+            // (when sorted by name)
+            let results = {};
+            let pos = 0;
+            fs.createReadStream( filepath )
+            .pipe( csv() )
+            .on( 'data', ( data ) => {
+                results[ pos ] = data;
+                pos += 1;
+            } ).on( 'end', () => {
+                resolve( results );
+            } );
+        } else if ( filepath.includes( '.json' ) ) {
+            resolve( JSON.parse( fs.readFileSync( filepath ) ) );
+        }
+    } );
+}
 
 module.exports = ( app ) => {
     app.get( '/apple-music', ( req, res ) => {
@@ -29,4 +51,22 @@ module.exports = ( app ) => {
     app.get( '/logo.png', ( req, res ) => {
         res.sendFile( path.join( __dirname + '/client/logo.png' ) );
     } );
+
+    app.get( '/apple-music/getAdditionalData', ( req, res ) => {
+        const filepath = dialog.showOpenDialogSync( { 
+            properties: [ 'openFile' ],
+            title: 'Open file with additional data on the songs',
+            filters: [
+                { 
+                    name: 'CSV', extensions: [ '.csv' ],
+                    name: 'JSON', extensions: [ '.json' ]
+                }
+            ]
+        } );
+        analyzeFile( filepath ).then( analyzedFile => {
+            res.send( analyzeFile );
+        } ).catch( err => {
+            res.status( 500 ).send( 'no csv / json file' );
+        } )
+    } );
 }