notes.js

const fs=require('fs');


var fetchNotes=()=>{
    try{
        var notesString =fs.readFileSync('notes-data.json');
        return JSON.parse(notesString);
        }catch(err){
            // console.log(err);
            return [];
    }
};
var saveNotes=(notes)=>{
    fs.writeFileSync('notes-data.json',JSON.stringify(notes));
};

var addNote=(title,body)=>{
    var notes=fetchNotes();
    var note={
        title,
        body
    };

    var duplicateNotes=notes.filter(note=>note.title===title);

    if(duplicateNotes.length===0){
        notes.push(note);
       saveNotes(notes);
       return note;
    }
};

var getAll=()=>{
    return fetchNotes();
};

var getNote=(title)=>{
    var notes=fetchNotes();
    var filterNotes=notes.filter((note)=>{
        return note.title===title;
    });
    return filterNotes[0];
};

var removeNote=(title)=>{
    var notes=fetchNotes();
    var filterNotes=notes.filter((note)=>note.title!==title);
    saveNotes(filterNotes);

    return notes.length !==filterNotes.length;
};

var logNote=(note=>{
        console.log('--');
        console.log(`Title : ${note.title}`);
        console.log(`Body : ${note.body}`);
});

module.exports={
    addNote,
    getAll,
    getNote,
    removeNote,
    logNote
};