NotePostApp/www/js/Notes.class.js

/*
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

class Notes {

    constructor() {
        this.notes = [];
    }

    get(id) {
        for (var i = 0; i < this.notes.length; i++) {
            if (this.notes[i].id == id) {
                return this.notes[i];
            }
        }
        return null;
    }

    getAll() {
        return this.notes;
    }

    set(note) {
        for (var i = 0; i < this.notes.length; i++) {
            if (this.notes[i].id == note.id) {
                // Refresh HTML rendering
                note.html = marked(note.content);

                this.notes[i] = note;
                return;
            }
        }
        this.notes.push(note);
    }

    del(noteid, callback) {
        var newnotearr = [];
        for (var i = 0; i < this.notes.length; i++) {
            if (this.notes[i].id != noteid) {
                newnotearr.push(this.notes[i]);
            }
        }
        this.notes = newnotearr;
        if (typeof callback == 'function') {
            callback();
        }
    }

    add(note, callback) {
        this.notes.push(note);
        if (typeof callback == 'function') {
            callback();
        }
    }

    fix(note) {
        // Set background color
        if (typeof note.color !== 'string') {
            note.color = "FFF59D";
        }
        // Set text color based on background
        if (typeof note.textcolor !== 'string') {
            var r = parseInt(note.color.substring(0, 2), 16);
            var g = parseInt(note.color.substring(2, 4), 16);
            var b = parseInt(note.color.substring(4, 6), 16);
            var contrast = Math.sqrt(
                    r * r * 0.241 +
                    g * g * 0.691 +
                    b * b * 0.068
                    );
            if (contrast > 130) {
                note.textcolor = "000000";
            } else {
                note.textcolor = "FFFFFF";
            }
        }
        // Just in case
        if (typeof note.content !== 'string') {
            note.content = "";
        }
        // Set title
        if (typeof note.title !== 'string') {
            note.title = note.content.split('\n')[0].replace(/[#\-]+/gi, "").trim();
        }
        if (typeof note.modified !== 'string') {
            note.modified = (new Date()).toISOString();
        }
        // Render Markdown to HTML
        if (typeof note.html !== 'string') {
            note.html = marked(note.content);
        }
        // Save
        this.set(note);
    }

    fixAll() {
        for (var i = 0; i < this.notes.length; i++) {
            this.fix(this.notes[i]);
        }
    }

    load(callback) {
        if (localStorage.getItem("notes") !== null) {
            var data = JSON.parse(localStorage.getItem("notes"));
            if (data.length > 0) {
                this.notes = data;
            }
        }
        if (typeof callback == 'function') {
            callback();
        }
    }

    save(callback) {
        localStorage.setItem("notes", JSON.stringify(this.notes));
        if (typeof callback == 'function') {
            callback();
        }
    }
}