#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")] // hide console window on Windows in release

use std::io;
use std::sync::{Arc, Mutex};
use std::time::Duration;
use std::{io::Write, thread};

use eframe::egui;
use egui_plot::{Line, Plot, PlotBounds, PlotPoints};

use cheapsdo_protocol::*;
use postcard::{from_bytes_cobs, to_stdvec_cobs};

mod formatters;

fn main() -> Result<(), eframe::Error> {
    let options = eframe::NativeOptions {
        viewport: egui::ViewportBuilder::default(),
        ..Default::default()
    };
    eframe::run_native(
        "Cheapsdo Control",
        options,
        Box::new(|cc| Box::<CheapsdoControl>::default()),
    )
}

struct SharedState {
    device_state: StatusMessage,
    average_points: Vec<[f64; 2]>,
    measured_points: Vec<[f64; 2]>,
    pwm_points: Vec<[f64; 2]>,
}

impl Default for SharedState {
    fn default() -> Self {
        Self {
            device_state: StatusMessage::default(),
            average_points: Vec::<[f64; 2]>::new(),
            measured_points: Vec::<[f64; 2]>::new(),
            pwm_points: Vec::<[f64; 2]>::new(),
        }
    }
}

struct CheapsdoControl {
    shared_state: Arc<Mutex<SharedState>>,
    serial_device: String,
    serial_connected: bool,
}

impl Default for CheapsdoControl {
    fn default() -> Self {
        Self {
            shared_state: Arc::new(Mutex::new(SharedState::default())),
            serial_device: "".to_owned(),
            serial_connected: false,
        }
    }
}

impl eframe::App for CheapsdoControl {
    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
        let ports =
            serialport::available_ports().unwrap_or(Vec::<serialport::SerialPortInfo>::new());

        egui::CentralPanel::default().show(ctx, |ui| {
            ui.horizontal(|ui| {
                egui::ComboBox::from_label("Select Serialport")
                    .selected_text(self.serial_device.to_owned())
                    .show_ui(ui, |ui| {
                        for port in ports {
                            ui.selectable_value(
                                &mut self.serial_device,
                                port.port_name.to_owned(),
                                port.port_name,
                            );
                        }
                    });

                if ui
                    .add_enabled(!self.serial_connected, egui::Button::new("Open"))
                    .clicked()
                {
                    self.serial_connected = true;

                    let serial_device = self.serial_device.clone();
                    let devicestate = self.shared_state.clone();
                    let ctx = ctx.clone();

                    std::thread::spawn(move || {
                        poll_device(serial_device, devicestate, ctx);
                    });
                }

                if ui
                    .add_enabled(self.serial_connected, egui::Button::new("Close"))
                    .clicked()
                {}
            });

            ui.separator();

            {
                let mut state = self.shared_state.lock().unwrap();
                ui.horizontal(|ui| {
                    ui.label(
                        egui::RichText::new(format!(
                            "Measured: {}",
                            formatters::frequency(state.device_state.measured_frequency)
                        ))
                        .family(egui::FontFamily::Monospace)
                        .size(20.0),
                    );

                    ui.add_space(100.0);

                    ui.label(
                        egui::RichText::new(format!(
                            "Average: {}",
                            formatters::frequency(state.device_state.average_frequency)
                        ))
                        .family(egui::FontFamily::Monospace)
                        .size(20.0),
                    );
                });

                ui.add_space(20.0);

                let average_line = Line::new(PlotPoints::new(state.average_points.clone()));
                let measured_line = Line::new(PlotPoints::new(state.measured_points.clone()));
                Plot::new("frequency_plot")
                    .view_aspect(4.0)
                    .allow_zoom(false)
                    .allow_scroll(false)
                    .allow_drag(false)
                    .allow_boxed_zoom(false)
                    .y_axis_width(12)
                    .y_axis_formatter(|val, _, _| formatters::frequency(val))
                    .label_formatter(|name, value| {
                        format!("{}: {}", name, formatters::frequency(value.y))
                    })
                    .show(ui, |plot_ui| {
                        plot_ui.set_auto_bounds([true, true].into());
                        plot_ui.line(average_line);
                        //plot_ui.line(measured_line);
                    });

                ui.add_space(20.0);

                let pwm_line = Line::new(PlotPoints::new(state.pwm_points.clone()));
                Plot::new("pwm_plot")
                    .view_aspect(4.0)
                    .allow_zoom(false)
                    .allow_scroll(false)
                    .allow_drag(false)
                    .allow_boxed_zoom(false)
                    .y_axis_width(12)
                    .show(ui, |plot_ui| {
                        plot_ui.set_auto_bounds([true, true].into());
                        plot_ui.line(pwm_line);
                    });
            }
        });
    }
}

fn poll_device(port: String, state: Arc<Mutex<SharedState>>, ctx: egui::Context) {
    let mut port = serialport::new(port, 115_200)
        .timeout(Duration::from_millis(10))
        .open()
        .expect("Failed to open port");

    loop {
        let host_msg = HostMessage::RequestStatus;
        let msg_bytes = to_stdvec_cobs(&host_msg).unwrap();

        port.write_all(&msg_bytes).unwrap();

        let mut serial_buf: Vec<u8> = vec![0; 128];
        match port.read(serial_buf.as_mut_slice()) {
            Ok(t) => {
                serial_buf.truncate(t);
                println!("Data: {:?}", serial_buf);

                let dev_msg = from_bytes_cobs::<DeviceMessage>(&mut serial_buf).unwrap();

                match dev_msg {
                    DeviceMessage::Status(status_msg) => {
                        let mut state = state.lock().unwrap();
                        let x = state.average_points.len() as f64;
                        state.average_points.push([x, status_msg.average_frequency]);
                        state
                            .measured_points
                            .push([x, status_msg.measured_frequency]);
                        state.pwm_points.push([x, status_msg.pwm as f64]);

                        state.device_state = status_msg;
                        ctx.request_repaint()
                    }
                }
            }
            Err(ref e) if e.kind() == io::ErrorKind::TimedOut => (),
            Err(e) => eprintln!("{:?}", e),
        }

        thread::sleep(Duration::from_millis(1000));
    }
}