// This file is part of Deja-Vu.
//
// Deja-Vu is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Deja-Vu is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Deja-Vu. If not, see <https://www.gnu.org/licenses/>.
//
use core::{action::Action, components::Component, config::Config, state::Mode};
use std::{
    iter::zip,
    sync::{Arc, Mutex},
};

use color_eyre::Result;
use crossterm::event::KeyEvent;
use ratatui::{
    prelude::*,
    widgets::{Block, Borders, Clear, List, ListItem, Padding, Paragraph},
};
use tokio::sync::mpsc::UnboundedSender;

use crate::wim::WimSources;

#[derive(Default)]
pub struct WimScan {
    command_tx: Option<UnboundedSender<Action>>,
    config: Config,
    mode: Mode,
    scan_network: bool,
    wim_sources: Arc<Mutex<WimSources>>,
}

impl WimScan {
    #[must_use]
    pub fn new(wim_sources: Arc<Mutex<WimSources>>) -> Self {
        let wim_sources = wim_sources.clone();
        Self {
            wim_sources,
            ..Default::default()
        }
    }
}

impl Component for WimScan {
    fn handle_key_event(&mut self, key: KeyEvent) -> Result<Option<Action>> {
        let _ = key; // to appease clippy
        Ok(None)
    }

    fn register_action_handler(&mut self, tx: UnboundedSender<Action>) -> Result<()> {
        self.command_tx = Some(tx);
        Ok(())
    }

    fn register_config_handler(&mut self, config: Config) -> Result<()> {
        self.config = config;
        Ok(())
    }

    fn update(&mut self, action: Action) -> Result<Option<Action>> {
        match action {
            Action::FindWimNetwork => self.scan_network = true,
            Action::SetMode(new_mode) => {
                self.mode = new_mode;
            }
            _ => {}
        }
        Ok(None)
    }

    fn draw(&mut self, frame: &mut Frame, area: Rect) -> Result<()> {
        if self.mode != Mode::ScanWinSources {
            return Ok(());
        }
        frame.render_widget(Clear, area);

        // Prep
        let [left, right] = Layout::default()
            .direction(Direction::Horizontal)
            .constraints([Constraint::Percentage(50), Constraint::Percentage(50)])
            .areas(area);
        let [left_title, left_body] = Layout::default()
            .direction(Direction::Vertical)
            .constraints([Constraint::Length(1), Constraint::Min(1)])
            .areas(left);
        let [right_title, right_body] = Layout::default()
            .direction(Direction::Vertical)
            .constraints([Constraint::Length(1), Constraint::Min(1)])
            .areas(right);

        // Titles
        let titles = vec![
            Paragraph::new(Line::from("Local").centered())
                .block(Block::default().borders(Borders::NONE)),
            Paragraph::new(Line::from("Network").centered())
                .block(Block::default().borders(Borders::NONE)),
        ];
        for (title, area) in zip(titles, [left_title, right_title]) {
            frame.render_widget(title, area);
        }

        // WIM Info
        if let Ok(wim_sources) = self.wim_sources.lock() {
            // Local
            let mut left_list = Vec::new();
            if wim_sources.thread_local.is_some() {
                left_list.push(ListItem::new("Scanning..."));
            } else {
                left_list.extend(
                    wim_sources
                        .local
                        .iter()
                        .map(|wimfile| ListItem::new(format!("{}\n\n", wimfile.path))),
                );
            }
            let left_list = List::new(left_list).block(
                Block::default()
                    .borders(Borders::ALL)
                    .padding(Padding::new(1, 1, 1, 1)),
            );
            frame.render_widget(left_list, left_body);

            // Network
            let mut right_list = Vec::new();
            if wim_sources.thread_network.is_some() {
                right_list.push(ListItem::new("Scanning..."));
            } else {
                right_list.extend(wim_sources.network.iter().map(|wimfile| {
                    ListItem::new(format!(
                        "{}\n\n",
                        wimfile.path.split("\\").last().unwrap_or(&wimfile.path)
                    ))
                }));
            }
            let right_list = List::new(right_list).block(
                Block::default()
                    .borders(Borders::ALL)
                    .padding(Padding::new(1, 1, 1, 1)),
            );
            frame.render_widget(right_list, right_body);
        }

        // Done
        Ok(())
    }
}