use iced::widget::{button, column, text};
use iced::executor;
use iced::keyboard;
use iced::event;
use iced::subscription;
use iced::{Alignment, Element, Application, Settings, Subscription, Theme, Command};

use crate::stream::OutputStream;
use crate::config::GUI;

pub fn main(cfg: GUI, output_stream: Box<dyn OutputStream>) -> iced::Result {
   let def: iced::Settings<()> = Settings::default();
   let settings = Settings{
      flags: Flags {
         output_stream: output_stream,
         cfg: cfg,
      },
      antialiasing: def.antialiasing,
      default_font: def.default_font,
      default_text_size: def.default_text_size,
      exit_on_close_request: def.exit_on_close_request,
      id: def.id,
      text_multithreading: def.text_multithreading,
      try_opengles_first: def.try_opengles_first,
      window: def.window,
   };
   Main::run(settings)
}

struct Main {
   ntfy: String,
   configuring: Option<Message>,
   inputs: Inputs,
   // TODO keys down
   flags: Flags,
}

struct Flags {
   output_stream: Box<dyn OutputStream>,
   cfg: GUI,
}

struct Inputs {
   stick: Stick,
   a: iced::keyboard::KeyCode,
   b: iced::keyboard::KeyCode,
   x: iced::keyboard::KeyCode,
   y: iced::keyboard::KeyCode,
   l: iced::keyboard::KeyCode,
   r: iced::keyboard::KeyCode,
}

struct Stick {
   up: iced::keyboard::KeyCode,
   down: iced::keyboard::KeyCode,
   left: iced::keyboard::KeyCode,
   right: iced::keyboard::KeyCode,
}

#[derive(Debug, Clone)]
enum Message {
   EventOccurred(iced_native::Event),
   Up,
   Down,
   Left,
   Right,
   A,
   B,
   X,
   Y,
   L,
   R,
}

fn controller_button_to_string(btn: Message, cur: iced::keyboard::KeyCode) -> String {
   return format!("{:?} => {:?}", cur, btn);
}

impl Application for Main {
   type Message = Message;
   type Flags = Flags;
   type Theme = Theme;
   type Executor = executor::Default;

   fn new(flags: Self::Flags) -> (Self, Command<Message>) {
      return (Self {
         ntfy: String::from(":wave:"),
         configuring: None,
         inputs: Inputs{
            stick: Stick {
               up: iced::keyboard::KeyCode::W,
               down: iced::keyboard::KeyCode::S,
               left: iced::keyboard::KeyCode::A,
               right: iced::keyboard::KeyCode::D,
            },
            a: iced::keyboard::KeyCode::Key1,
            b: iced::keyboard::KeyCode::Key2,
            x: iced::keyboard::KeyCode::Key3,
            y: iced::keyboard::KeyCode::Key4,
            l: iced::keyboard::KeyCode::Q,
            r: iced::keyboard::KeyCode::E,
         },
         flags: flags,
      }, Command::none())
   }

   fn title(&self) -> String {
      return String::from("Rusty Pipe")
   }

   fn update(&mut self, msg: Message) -> Command<Message> {
      match msg.clone() {
         Message::EventOccurred(event) if self.configuring.is_some() => {
            match event {
               iced::event::Event::Keyboard(keyboard::Event::KeyPressed{
                  key_code,
                  modifiers: _,
                  ..
               }) => {
                  match self.configuring.as_ref().unwrap() {
                     Message::Up => { self.inputs.stick.up = key_code },
                     Message::Down => { self.inputs.stick.down = key_code },
                     Message::Left => { self.inputs.stick.left = key_code },
                     Message::Right => { self.inputs.stick.right = key_code },
                     Message::A => { self.inputs.a = key_code },
                     Message::B => { self.inputs.b = key_code },
                     Message::X => { self.inputs.x = key_code },
                     Message::Y => { self.inputs.y = key_code },
                     Message::L => { self.inputs.l = key_code },
                     Message::R => { self.inputs.r = key_code },
                     _ => {},
                  };
                  self.ntfy = format!("{:?} => {:?}", key_code.clone(), self.configuring.as_ref().unwrap());
                  self.configuring = None;
               },
               _ => {},
            }
         },
         Message::EventOccurred(event) => {
            eprintln!("{:?}", event);
            match event {
               iced::event::Event::Keyboard(keyboard::Event::KeyPressed{ // TODO key released
                  key_code,
                  modifiers: _,
                  ..
               }) => {
                  let nope = String::from("");
                  let s = match key_code {
                     _ if key_code == self.inputs.stick.up => &self.flags.cfg.up,
                     _ if key_code == self.inputs.stick.down => &self.flags.cfg.down,
                     _ if key_code == self.inputs.stick.left => &self.flags.cfg.left,
                     _ if key_code == self.inputs.stick.right => &self.flags.cfg.right,
                     _ if key_code == self.inputs.a => &self.flags.cfg.a,
                     _ if key_code == self.inputs.b => &self.flags.cfg.b,
                     _ if key_code == self.inputs.x => &self.flags.cfg.x,
                     _ if key_code == self.inputs.y => &self.flags.cfg.y,
                     _ if key_code == self.inputs.l => &self.flags.cfg.l,
                     _ if key_code == self.inputs.r => &self.flags.cfg.r,
                     _ => &nope,
                  };
                  if s.len() > 0 {
                     self.flags.output_stream.put(s.chars().collect());
                  }
               },
               _ => {},
            }
         },
         _ => {
            self.configuring = Some(msg.clone());
            self.ntfy = format!("push a key to bind to {:?}", msg.clone());
         },
      }
      // TODO self.flags.output_stream.put(s.chars().collect()); for all keys down
      return Command::none();
   }

   fn subscription(&self) -> Subscription<Message> {
      return subscription::events_with(|event, _| match event {
         iced::Event::Keyboard(_) => Some(Message::EventOccurred(event)),
         _ => None,
      });
   }

   fn view(&self) -> Element<Message> {
      return column![
               button(text(controller_button_to_string(Message::Up, self.inputs.stick.up))).on_press(Message::Up),
               button(text(controller_button_to_string(Message::Down, self.inputs.stick.down))).on_press(Message::Down),
               button(text(controller_button_to_string(Message::Left, self.inputs.stick.left))).on_press(Message::Left),
               button(text(controller_button_to_string(Message::Right, self.inputs.stick.right))).on_press(Message::Right),
               button(text(controller_button_to_string(Message::A, self.inputs.a))).on_press(Message::A),
               button(text(controller_button_to_string(Message::B, self.inputs.b))).on_press(Message::B),
               button(text(controller_button_to_string(Message::X, self.inputs.x))).on_press(Message::X),
               button(text(controller_button_to_string(Message::Y, self.inputs.y))).on_press(Message::Y),
               button(text(controller_button_to_string(Message::L, self.inputs.l))).on_press(Message::L),
               button(text(controller_button_to_string(Message::R, self.inputs.r))).on_press(Message::R),
               text(self.ntfy.clone()).size(50),
         ]
         .padding(20)
         .align_items(Alignment::Center)
         .into();
    }
}