const fs = require('fs');

var fetchNotes = () => {
    try {
        var noteString = fs.readFileSync('notes-data.json');
        return JSON.parse(noteString);
    } catch (e) {
        return [];
    }
};

var saveNotes = (notes) => {
    fs.writeFileSync('notes-data.json', JSON.stringify(notes));
};

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

    var duplicatesNotes = notes.filter((note) => note.title === title);
    //console.log( "If you get message your input object was duplicated");
    if(duplicatesNotes.length === 0) {
        notes.push(note);
        saveNotes(notes);
        return note;
    }
};

var getAll = () => {
    return fetchNotes();
    console.log(' You Getting all notes from getAll() function');
};

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

    console.log(' You calling a getNote() function to fetch the notes', title);
}

var getRemove = (title) => {
    var notes = fetchNotes();
    var filteredNotes = notes.filter((note) => note.title !== title);
    saveNotes(filteredNotes);

    // this return statement is evaluating,
    // cause notes and flteredNotes came with a new values
    // and we wanna print out the message in 'remove' command in app.js.
    // if not equal is return to a new filteredNotes
    // if is equal is return a notes.length
    return notes.length !== filteredNotes.length;
}

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

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