/*
Copyright 2023, Savanni D'Gerinel <savanni@luminescent-dreams.com>

This file is part of FitnessTrax.

FitnessTrax is free software: you can redistribute it and/or modify it under the terms of the GNU
General Public License as published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.

FitnessTrax is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License along with FitnessTrax. If not, see <https://www.gnu.org/licenses/>.
*/

use gtk::prelude::*;
use std::{cell::RefCell, rc::Rc};

pub struct ParseError;

#[derive(Clone)]
pub struct TextEntry<T: Clone> {
    value: Rc<RefCell<Option<T>>>,
    widget: gtk::Entry,
}

impl<T: Clone> TextEntry<T> {
    pub fn new(
        placeholder: &str,
        value: Option<T>,
        validator: &'static dyn Fn(&str) -> Result<T, ParseError>,
    ) -> Self {
        let widget = gtk::Entry::builder().placeholder_text(placeholder).build();

        let s = Self {
            value: Rc::new(RefCell::new(value)),
            widget,
        };

        s.widget.buffer().connect_text_notify({
            let s = s.clone();
            move |buffer| {
                if buffer.text().is_empty() {
                    *s.value.borrow_mut() = None;
                }
                match validator(buffer.text().as_str()) {
                    Ok(v) => *s.value.borrow_mut() = Some(v),
                    // need to change the border to provide a visual indicator of an error
                    Err(_) => {}
                }
            }
        });

        s
    }

    pub fn value(&self) -> Option<T> {
        self.value.borrow().clone()
    }

    pub fn set_value(&self, value: Option<T>) {
        *self.value.borrow_mut() = value;
    }

    pub fn grab_focus(&self) {
        self.widget.grab_focus();
    }

    pub fn widget(&self) -> gtk::Widget {
        self.widget.clone().upcast::<gtk::Widget>()
    }
}