#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")]

mod components;
mod constants;
mod file;
mod handler;
mod io;
mod key_bindings;
mod message;
mod state;

use iced::theme::Palette;
use iced::widget::column;
use iced::window::icon;
use iced::{Color, Theme};
use iced::{Element, Subscription, Task, event};
use iced::{keyboard, window};

use crate::message::Message;
use crate::state::State;

pub fn main() -> iced::Result {
  iced::daemon(boot, update, view)
    .subscription(subscription)
    .font(constants::CUSTOM_FONT_BYTES)
    .theme(theme)
    .settings(iced::Settings {
      default_font: constants::CUSTOM_FONT,
      ..Default::default()
    })
    .run()
}

fn boot() -> (State, Task<Message>) {
  let (id, open) = window::open(window::Settings {
    icon: Some(icon::from_file_data(constants::ICON_BYTES, None).expect("Failed to load icon")),
    ..window::Settings::default()
  });

  let mut state = state::State::new(id);
  let mut tasks = vec![open.map(Message::WindowOpened)];

  let args: Vec<String> = std::env::args().collect();

  if args.len() > 1 {
    let path = std::path::PathBuf::from(&args[1]);

    state.set_active_file_path(path.clone());

    if path.exists() {
      tasks.push(Task::perform(io::load_file(path), Message::FileOpened));
    }
  }

  (state, Task::batch(tasks))
}

fn update(state: &mut State, message: Message) -> Task<Message> {
  match message {
    Message::Edit(action) => handler::edit(state, action),
    Message::SwitchTab(index) => handler::switch_tab(state, index),
    Message::LinkClicked(url) => handler::link_clicked(url),
    Message::FileActionSelected(action) => handler::file_action(state, action),
    Message::ViewActionSelected(action) => handler::view_action(state, action),
    Message::FileOpened(result) => handler::opened_file(state, result),
    Message::FileSaved(result) => handler::saved_file(state, result),
    Message::WindowOpened(id) => {
      state.set_window_id(id);
      Task::none()
    }
    Message::WindowClosed(id) => {
      if state.window_id() == Some(id) {
        iced::exit()
      } else {
        Task::none()
      }
    }
  }
}

fn view(state: &State, _id: iced::window::Id) -> Element<'_, Message> {
  let current_file = state.active_file();

  column![
    components::tabs::view(state.files(), state.current_file_index()),
    components::action_bar::view(state.selected_file_action(), state.selected_view_action()),
    components::editor::view(
      current_file,
      state.mode(),
      state.font_size(),
      state.is_word_wrap_on()
    ),
    components::status_bar::view(current_file),
  ]
  .into()
}

fn subscription(_state: &State) -> Subscription<Message> {
  event::listen_with(|e, _status, win| -> Option<Message> {
    match e {
      iced::Event::Window(window::Event::Closed) => Some(Message::WindowClosed(win)),
      iced::Event::Keyboard(keyboard::Event::KeyPressed { key, modifiers, .. }) => {
        for vb in key_bindings::ALL {
          if vb.should_handle(&key, &modifiers) {
            return Some(vb.message());
          }
        }

        None
      }
      _ => None,
    }
  })
}

fn theme(_state: &State, _id: iced::window::Id) -> Theme {
  Theme::custom(
    "Win11 Dark",
    Palette {
      background: Color::from_rgb8(0x20, 0x20, 0x20),
      text: Color::from_rgb8(0xF2, 0xF2, 0xF2),
      primary: Color::from_rgb8(0x2C, 0x2C, 0x2C),
      success: Color::from_rgb8(0x4C, 0xC3, 0x8A),
      warning: Color::from_rgb8(0xF5, 0xC8, 0x4B),
      danger: Color::from_rgb8(0xE8, 0x6A, 0x6A),
    },
  )
}