#![warn(clippy::pedantic)]

use std::{
    f32::consts::FRAC_PI_2,
    io::stdout,
    net::{Ipv4Addr, SocketAddr, UdpSocket},
    num::ParseIntError,
    str::FromStr,
    thread::sleep,
    time::Duration,
};

use bracket_color::prelude::{HSV, RGB};
use clap::{Parser, Subcommand};
use image::{Pixel, Rgb, RgbImage};
use rand::Rng;

use splink_client::{send_frame, Layout};
use thiserror::Error;

/// Blinkenwall v3 prototype client
#[derive(Parser, Debug)]
#[clap(author, version, about, long_about = None)]
struct Args {
    /// Timeout in ms for frame completion responses (0 to disable)
    #[clap(long, default_value_t = 3)]
    response_timeout: u64,

    /// Local address and port to bind to
    #[clap(long = "bind")]
    bind_addr: Option<SocketAddr>,

    /// Controller's address
    remote_addr: SocketAddr,

    /// The action to perform
    #[clap(subcommand, rename_all = "kebab-case")]
    action: Action,
}

#[derive(Clone, Copy, Debug, PartialEq, Eq)]
struct Color {
    r: u8,
    g: u8,
    b: u8,
}

#[derive(Clone, Debug, Error)]
enum ColorError {
    #[error("Wrong parameter length")]
    WrongLength,
    #[error("Illegal integer")]
    BadNumber(#[from] ParseIntError),
}

impl FromStr for Color {
    type Err = ColorError;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        let s = s.strip_prefix('#').unwrap_or(s);

        if s.len() != 6 {
            return Err(ColorError::WrongLength);
        }

        let r = u8::from_str_radix(&s[0..2], 16)?;
        let g = u8::from_str_radix(&s[2..4], 16)?;
        let b = u8::from_str_radix(&s[4..6], 16)?;

        Ok(Self { r, g, b })
    }
}

impl From<Color> for Rgb<u8> {
    fn from(c: Color) -> Rgb<u8> {
        Rgb([c.r, c.g, c.b])
    }
}

#[derive(Clone, Debug, PartialEq, Eq, Subcommand)]
enum Action {
    Rainbow,
    Solid { color: Color },
    Clear,
}

fn get_frame(layout: Layout, frame: u32) -> RgbImage {
    #![allow(
        clippy::cast_precision_loss,
        clippy::cast_lossless,
        clippy::cast_possible_truncation,
        clippy::cast_sign_loss
    )]

    let w = layout.width_px();
    let h = layout.height_px();

    let frame = frame % 60;
    let frame = frame as f32 / 3.0;

    RgbImage::from_fn(w, h, |x, y| {
        let dist_from_center = {
            let x = x as f32;
            let y = y as f32;

            let center_x = w as f32 / 2.0;
            let center_y = h as f32 / 2.0;

            ((x - center_x).powf(2.0) + (y - center_y).powf(2.0)).sqrt()
        };

        let radius = frame.powf(1.8);

        let dist_from_radius = dist_from_center - radius;
        let dist = 0.3 * dist_from_radius;

        Rgb([100, 0, 100]).map(|x| {
            (if dist < 0.0 {
                (1.0 - (dist.abs() / 10.0)).max(0.0)
            } else {
                dist.min(FRAC_PI_2).cos()
            } * x as f32) as u8
        })
    })
}

fn rainbow(layout: Layout, frame: u32) -> RgbImage {
    #![allow(
        clippy::cast_precision_loss,
        clippy::cast_lossless,
        clippy::cast_possible_truncation,
        clippy::cast_sign_loss
    )]

    let w = layout.width_px();
    let h = layout.height_px();

    RgbImage::from_fn(w, h, |x, y| {
        let RGB { r, g, b } =
            HSV::from_f32((x + y + frame) as f32 / 100.0 % 1.0, 1.0, 0.1).to_rgb();
        Rgb([(r * 255.0) as u8, (g * 255.0) as u8, (b * 255.0) as u8])
    })
}

fn print_image(image: &RgbImage) {
    let _hide = termion::cursor::HideCursor::from(stdout());

    print!("{}", termion::cursor::Goto(1, 1));
    for row in image.rows() {
        for &Rgb([r, g, b]) in row {
            print!("{}  ", termion::color::Rgb(r, g, b).bg_string());
        }
        println!("{}", termion::color::Reset.bg_str());
    }
}

fn main() -> anyhow::Result<()> {
    let args = Args::parse();

    let bind_addr = args
        .bind_addr
        .unwrap_or_else(|| (Ipv4Addr::UNSPECIFIED, 0).into());
    let socket = UdpSocket::bind(bind_addr)?;

    socket.connect(args.remote_addr)?;
    socket.set_read_timeout(match args.response_timeout {
        0 => None,
        t => Some(Duration::from_millis(t)),
    })?;

    let layout = Layout {
        gang_len: 8,
        num_gangs: 32,

        num_panels_h: 6,
        num_panels_v: 1,

        total_strands: 24,
        first_strand_index: 8,
    };

    match args.action {
        Action::Solid { color } => {
            let image = RgbImage::from_pixel(layout.width_px(), layout.height_px(), color.into());
            let frame_num: u32 = rand::thread_rng().gen();
            send_frame(&socket, layout, frame_num, &image)?;
        }
        Action::Clear => {
            let image = RgbImage::new(layout.width_px(), layout.height_px());
            let frame_num: u32 = rand::thread_rng().gen();
            send_frame(&socket, layout, frame_num, &image)?;
        }
        Action::Rainbow => {
            print!("{}", termion::clear::All);

            for frame in 0.. {
                let image = rainbow(layout, frame);

                print_image(&image);

                let frame_num: u32 = rand::thread_rng().gen();
                send_frame(&socket, layout, frame_num, &image)?;

                sleep(Duration::from_millis(16));
            }
        }
    }

    Ok(())
}