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

use std::io;

use std::io::Write;
use std::time::Duration;

use crossbeam_channel::{select, unbounded, Receiver, Sender};

use eframe::egui;
use egui_plot::{Line, Plot, 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()),
    )
}

#[derive(PartialEq, Debug)]
enum SerialPortCmd {
    Disconnect,
}

#[derive(PartialEq, Debug)]
enum SerialPortData {
    DeviceState(StatusMessage),
}

struct CheapsdoControl {
    serial_device: String,
    serial_connected: bool,

    data_rx: Option<Receiver<SerialPortData>>,
    cmd_tx: Option<Sender<SerialPortCmd>>,

    device_state: StatusMessage,
    average_points: Vec<[f64; 2]>,
    pwm_points: Vec<[f64; 2]>,
}

impl Default for CheapsdoControl {
    fn default() -> Self {
        Self {
            serial_device: "".to_owned(),
            serial_connected: false,
            data_rx: None,
            cmd_tx: None,

            device_state: StatusMessage::default(),
            average_points: Vec::new(),
            pwm_points: Vec::new(),
        }
    }
}

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());

        if let Some(data_rx) = &self.data_rx {
            loop {
                select! {
                    recv(data_rx) -> data => {
                        match data {
                        Ok(SerialPortData::DeviceState(status_msg)) => {
                            self.device_state = status_msg.clone();
                            self.average_points.push([self.average_points.len() as f64, status_msg.average_frequency]);
                            self.pwm_points.push([self.pwm_points.len() as f64, status_msg.pwm as f64]);
                        },
                        Err(_) => break,
                        };
                    },
                    default => break,
                }
            }
        }

        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 && !self.serial_device.is_empty(),
                        egui::Button::new("Open"),
                    )
                    .clicked()
                {
                    let serial_device = self.serial_device.clone();
                    let ctx = ctx.clone();

                    self.serial_connected = true;
                    self.average_points.clear();
                    self.pwm_points.clear();

                    let (cmd_tx, cmd_rx) = unbounded();
                    let (data_tx, data_rx) = unbounded();

                    self.cmd_tx = Some(cmd_tx);
                    self.data_rx = Some(data_rx);

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

                if ui
                    .add_enabled(self.serial_connected, egui::Button::new("Close"))
                    .clicked()
                {
                    if let Some(cmd_tx) = &self.cmd_tx {
                        cmd_tx.send(SerialPortCmd::Disconnect).unwrap();
                    }
                    self.serial_connected = false;
                }
            });

            ui.separator();

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

            ui.add_space(20.0);

            let average_line = Line::new(PlotPoints::new(self.average_points.clone()));
            //let measured_line = Line::new(PlotPoints::new(self.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(self.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,
    cmd_rx: Receiver<SerialPortCmd>,
    data_tx: Sender<SerialPortData>,
    ctx: egui::Context,
) {
    let mut port = serialport::new(port, 115_200)
        .timeout(Duration::from_millis(10))
        .open()
        .expect("Failed to open port");

    let host_msg = HostMessage::RequestStatus;
    let msg_bytes = to_stdvec_cobs(&host_msg).unwrap();
    port.write_all(&msg_bytes).unwrap();

    loop {
        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) => {
                        data_tx
                            .send(SerialPortData::DeviceState(status_msg))
                            .unwrap();
                        ctx.request_repaint();
                    }
                }
            }
            Err(ref e) if e.kind() == io::ErrorKind::TimedOut => (),
            Err(e) => eprintln!("{:?}", e),
        }

        select! {
            recv(cmd_rx) -> cmd => match cmd {
                Ok(SerialPortCmd::Disconnect) => return,
                Err(_) => {},
            },
            default(Duration::from_secs(1)) => {
                let host_msg = HostMessage::RequestStatus;
                let msg_bytes = to_stdvec_cobs(&host_msg).unwrap();
                port.write_all(&msg_bytes).unwrap();
            },
        }
    }
}