picocalc-os-rs/kernel/src/ui.rs

use crate::{
    TASK_STATE, TaskState,
    display::{FRAMEBUFFER, SCREEN_HEIGHT, SCREEN_WIDTH},
    format,
    peripherals::keyboard,
    usb::RESTART_USB,
};
use alloc::{string::String, vec::Vec};
use core::{fmt::Debug, str::FromStr, sync::atomic::Ordering};
use defmt::info;
use embassy_rp::{
    gpio::{Level, Output},
    peripherals::{PIN_13, PIN_14, PIN_15, SPI1},
    spi::{Async, Spi},
};
use embassy_sync::{
    blocking_mutex::raw::{CriticalSectionRawMutex, ThreadModeRawMutex},
    mutex::Mutex,
    signal::Signal,
};
use embassy_time::{Delay, Timer};
use embedded_graphics::{
    Drawable,
    draw_target::DrawTarget,
    mono_font::{
        MonoTextStyle,
        ascii::{FONT_6X9, FONT_6X10, FONT_9X15, FONT_10X20},
    },
    pixelcolor::Rgb565,
    prelude::{Dimensions, Point, Primitive, RgbColor, Size},
    primitives::{PrimitiveStyle, Rectangle, StyledDrawable},
    text::Text,
};
use embedded_hal_async::spi::SpiDevice;
use embedded_hal_bus::spi::{ExclusiveDevice, NoDelay};
use embedded_layout::{
    align::{horizontal, vertical},
    layout::linear::LinearLayout,
    object_chain::Chain,
    prelude::*,
};
use embedded_text::TextBox;
use shared::keyboard::{KeyCode, KeyState};

pub static SELECTIONS: Mutex<CriticalSectionRawMutex, SelectionList> =
    Mutex::new(SelectionList::new(Vec::new()));

pub async fn ui_handler() {
    loop {
        if let TaskState::Ui = *TASK_STATE.lock().await {
            if let Some(event) = keyboard::read_keyboard_fifo().await {
                if let KeyState::Pressed = event.state {
                    match event.key {
                        KeyCode::JoyUp => {
                            let mut selections = SELECTIONS.lock().await;
                            selections.up();
                        }
                        KeyCode::JoyDown => {
                            let mut selections = SELECTIONS.lock().await;
                            selections.down();
                        }
                        KeyCode::Enter | KeyCode::JoyRight => (),
                        _ => (),
                    }
                }
            }

            draw_selection().await;
        }
    }
}

async fn draw_selection() {
    let file_names: Vec<String> = {
        let guard = SELECTIONS.lock().await;
        guard.selections.clone()
    };

    let mut fb_lock = FRAMEBUFFER.lock().await;
    if let Some(fb) = fb_lock.as_mut() {
        let text_style = MonoTextStyle::new(&FONT_9X15, Rgb565::WHITE);
        let display_area = fb.bounding_box();

        const NO_BINS: &str = "No Programs found on SD Card. Ensure programs end with '.bin', and are located in the root directory";
        let no_bins = String::from_str(NO_BINS).unwrap();

        if file_names.is_empty() {
            TextBox::new(
                &no_bins,
                Rectangle::new(
                    Point::new(25, 25),
                    Size::new(display_area.size.width - 50, display_area.size.width - 50),
                ),
                text_style,
            )
            .draw(*fb)
            .unwrap();
        } else {
            let mut file_names = file_names.iter();
            let Some(first) = file_names.next() else {
                Text::new("No Programs found on SD Card\nEnsure programs end with '.bin',\nand are located in the root directory",
                Point::zero(), text_style).draw(*fb).unwrap();

                return;
            };

            let chain = Chain::new(Text::new(first, Point::zero(), text_style));

            // for _ in 0..file_names.len() {
            //     let chain = chain.append(Text::new(
            //         file_names.next().unwrap(),
            //         Point::zero(),
            //         text_style,
            //     ));
            // }

            LinearLayout::vertical(chain)
                .with_alignment(horizontal::Center)
                .arrange()
                .align_to(&display_area, horizontal::Center, vertical::Center)
                .draw(*fb)
                .unwrap();
        };
    }
}

pub struct SelectionList {
    current_selection: u16,
    pub selections: Vec<String>,
}

impl SelectionList {
    pub const fn new(selections: Vec<String>) -> Self {
        Self {
            selections,
            current_selection: 0,
        }
    }

    pub fn reset(&mut self) {
        self.current_selection = 1
    }

    fn down(&mut self) {
        if self.current_selection + 1 < self.selections.len() as u16 {
            self.current_selection += 1
        }
    }

    fn up(&mut self) {
        if self.current_selection > self.selections.len() as u16 {
            self.current_selection -= 1
        }
    }
}