use std::sync::LazyLock;

use joecalsend::ReceiveRequest;
use log::LevelFilter;
use ratatui::{
    buffer::Buffer,
    layout::{Constraint, Flex, Layout, Margin, Rect},
    style::{Color, Style, Stylize},
    symbols::border,
    text::{Line, Text, ToLine},
    widgets::{
        Block, Borders, List, ListItem, ListState, Padding, Paragraph, Row, Table, TableState,
        Widget,
    },
};
use tui_logger::{TuiLoggerLevelOutput, TuiLoggerWidget, TuiWidgetState};

use super::{App, CurrentScreen, Peer, SendingScreen};

static MAIN_MENU: LazyLock<Line> = LazyLock::new(|| {
    Line::from(vec![
        " Send ".into(),
        "<S>".blue().bold(),
        " Receive ".into(),
        "<R>".blue().bold(),
        " Logs ".into(),
        "<L>".blue().bold(),
        " Previous Screen ".into(),
        "<ESC>".blue().bold(),
        " Quit ".into(),
        "<Q>".blue().bold(),
    ])
});

static LOGGING_MENU: LazyLock<Line> = LazyLock::new(|| {
    Line::from(vec![
        " Reduce Logging Level ".into(),
        "<LEFT>".blue().bold(),
        " Increase Logging Level ".into(),
        "<RIGHT>".blue().bold(),
        " Previous Screen ".into(),
        "<ESC>".blue().bold(),
        " Quit ".into(),
        "<Q>".blue().bold(),
    ])
});

static CONTENT_RECEIVE_MENU: LazyLock<Line> = LazyLock::new(|| {
    Line::from(vec![
        " Select Previous ".into(),
        "<UP>".blue().bold(),
        " Select Next ".into(),
        "<DOWN>".blue().bold(),
        " Approve Selection ".into(),
        "<A>".blue().bold(),
        " Deny Selection ".into(),
        "<D>".blue().bold(),
        " Previous Screen ".into(),
        "<ESC>".blue().bold(),
        " Quit ".into(),
        "<Q>".blue().bold(),
    ])
});

static CONTENT_SEND_FILE_MENU: LazyLock<Line> = LazyLock::new(|| {
    Line::from(vec![
        " Select Previous ".into(),
        "<UP>".blue().bold(),
        " Select Next ".into(),
        "<DOWN>".blue().bold(),
        " Select ".into(),
        "<ENTER>".blue().bold(),
        " Parent Dir ".into(),
        "<LEFT>".blue().bold(),
        " Child Dir ".into(),
        "<RIGHT>".blue().bold(),
        " Enter Text ".into(),
        "<T>".blue().bold(),
        " Peers ".into(),
        "<TAB>".blue().bold(),
        " Previous Screen ".into(),
        "<ESC>".blue().bold(),
        " Quit ".into(),
        "<Q>".blue().bold(),
    ])
});

static CONTENT_SEND_PEERS_MENU: LazyLock<Line> = LazyLock::new(|| {
    Line::from(vec![
        " Select Previous ".into(),
        "<UP>".blue().bold(),
        " Select Next ".into(),
        "<DOWN>".blue().bold(),
        " Select ".into(),
        "<ENTER>".blue().bold(),
        " Enter Text ".into(),
        "<T>".blue().bold(),
        " Files ".into(),
        "<TAB>".blue().bold(),
        " Previous Screen ".into(),
        "<ESC>".blue().bold(),
        " Quit ".into(),
        "<Q>".blue().bold(),
    ])
});

impl Widget for &mut App {
    fn render(self, area: Rect, buf: &mut Buffer) {
        let main_layout = Layout::vertical([Constraint::Min(5), Constraint::Min(3)]);
        let [top, bottom] = main_layout.areas(area);

        let footer_layout =
            Layout::horizontal([Constraint::Percentage(30), Constraint::Percentage(70)]);
        let [footer_left, footer_right] = footer_layout.areas(bottom);
        let footer_margin = Margin::new(1, 1);

        let header_layout =
            Layout::horizontal([Constraint::Percentage(50), Constraint::Percentage(50)]);
        let [header_left, header_right] = header_layout.areas(top);
        let header_margin = Margin::new(1, 2);

        let subscreen_margin = Margin::new(2, 4);

        let current_screen = self.screen.last().unwrap();

        match current_screen {
            CurrentScreen::Main => {
                let rx_reqs: Vec<_> = self.receive_requests.values().collect();
                outer_frame(*current_screen, &MAIN_MENU, area, buf);
                logger(header_right.inner(header_margin), buf);
                let peers = PeersWidget { peers: &self.peers };
                ratatui::widgets::StatefulWidget::render(
                    peers,
                    footer_right.inner(footer_margin),
                    buf,
                    &mut self.peer_state,
                );
                NetworkInfoWidget.render(footer_left.inner(footer_margin), buf);
                receive_requests(
                    &rx_reqs,
                    &mut self.receiving_state,
                    header_left.inner(header_margin),
                    buf,
                );
            }
            CurrentScreen::Logging => {
                outer_frame(*current_screen, &LOGGING_MENU, area, buf);
                logger(area.inner(subscreen_margin), buf);
            }
            CurrentScreen::Receiving => {
                let rx_reqs: Vec<_> = self.receive_requests.values().collect();
                outer_frame(*current_screen, &CONTENT_RECEIVE_MENU, area, buf);
                receive_requests(
                    &rx_reqs,
                    &mut self.receiving_state,
                    top.inner(subscreen_margin),
                    buf,
                );
                logger(bottom.inner(subscreen_margin), buf);
            }
            CurrentScreen::Sending(s) => {
                match s {
                    SendingScreen::Files => {
                        outer_frame(*current_screen, &CONTENT_SEND_FILE_MENU, area, buf)
                    }
                    SendingScreen::Peers => {
                        outer_frame(*current_screen, &CONTENT_SEND_PEERS_MENU, area, buf)
                    }
                    SendingScreen::Text => {}
                }

                let peers = PeersWidget { peers: &self.peers };

                self.file_picker
                    .widget()
                    .render(header_left.inner(header_margin), buf);
                logger(header_right.inner(header_margin), buf);

                ratatui::widgets::StatefulWidget::render(
                    peers,
                    bottom.inner(subscreen_margin),
                    buf,
                    &mut self.peer_state,
                );
            }
            _ => {
                outer_frame(*current_screen, &MAIN_MENU, area, buf);
            }
        }
    }
}

fn outer_frame(screen: CurrentScreen, menu: &Line, area: Rect, buf: &mut Buffer) {
    let title = Line::from(" Joecalsend ".bold());
    let block = Block::bordered()
        .title(title.centered())
        .title_bottom(menu.clone().centered())
        .border_set(border::THICK);

    let current_screen = format!("{screen:?}",);
    let text = Text::from(Line::from(current_screen.yellow()));

    Paragraph::new(text)
        .centered()
        .block(block)
        .render(area, buf);
}

fn logger(area: Rect, buf: &mut Buffer) {
    let title = Line::from(log::max_level().as_str());
    let logger = TuiLoggerWidget::default()
        .output_separator('|')
        .output_timestamp(Some("%H:%M:%S%.3f".to_string()))
        .output_level(Some(TuiLoggerLevelOutput::Abbreviated))
        .output_target(true)
        .output_file(false)
        .output_line(false)
        .block(Block::bordered().title(title.centered()))
        .style(Style::default())
        .state(&TuiWidgetState::new().set_default_display_level(LevelFilter::Debug));
    logger.render(area, buf);
}

fn receive_requests(
    requests: &[&ReceiveRequest],
    state: &mut TableState,
    area: Rect,
    buf: &mut Buffer,
) {
    let title = Line::from(" Upload Requests ").bold();
    let block = Block::bordered().title(title.centered());

    let mut rows = Vec::new();
    for &req in requests {
        let src = req.alias.to_line().left_aligned();
        let mut size = 0;
        let files = req
            .files
            .values()
            .map(|f| {
                size += f.size;
                f.file_name.clone()
            })
            .collect::<Vec<_>>();
        let files = files.join(", ");
        let files = Line::from(files).centered();
        let size = Line::from(format!("{size}")).centered();
        rows.push(Row::new([src, size, files]).yellow());
    }

    if state.selected().is_none() && !rows.is_empty() {
        state.select(Some(0));
    } else if rows.is_empty() {
        state.select(None);
    };

    let widths = [
        Constraint::Max(20),
        Constraint::Max(15),
        Constraint::Min(50),
    ];

    let table = Table::new(rows, widths)
        .block(block)
        .header(Row::new([
            "Sender".bold().into_left_aligned_line(),
            "Bytes".bold().into_centered_line(),
            "Files".bold().into_centered_line(),
        ]))
        .row_highlight_style(Style::new().bg(Color::Rgb(99, 99, 99)));

    ratatui::widgets::StatefulWidget::render(table, area, buf, state);
}

#[derive(Debug, Clone)]
pub struct PeersWidget<'p> {
    pub peers: &'p [Peer],
}

impl<'p> ratatui::widgets::StatefulWidget for PeersWidget<'p> {
    type State = ListState;

    fn render(self, area: Rect, buf: &mut Buffer, state: &mut Self::State)
    where
        Self: Sized,
    {
        if self.peers.is_empty() {
            state.select(None);
        }
        if state.selected().is_none() {
            state.select(Some(0));
        }

        let mut items = Vec::with_capacity(self.peers.len());
        for Peer {
            addr,
            alias,
            fingerprint,
        } in self.peers.iter()
        {
            let item = format!("{:?}: {} ({})", addr, alias, fingerprint);
            let s = Line::from(item.yellow());
            let item = ListItem::new(s);
            items.push(item);
        }
        let title = Line::from(" Peers ".bold()).centered();
        let block = Block::default()
            .title(title)
            .borders(Borders::all())
            .padding(Padding::uniform(1));
        let list = List::new(items)
            .block(block)
            .highlight_style(Style::new().bg(Color::Rgb(99, 99, 99)));
        ratatui::widgets::StatefulWidget::render(list, area, buf, state);
    }
}

#[derive(Debug, Clone)]
pub struct NetworkInfoWidget;

impl Widget for NetworkInfoWidget {
    fn render(self, area: Rect, buf: &mut Buffer)
    where
        Self: Sized,
    {
        let udp = "UDP socket";
        let udp = udp.to_line().left_aligned();
        let uaddr = format!("{:?}", joecalsend::LISTENING_SOCKET_ADDR);
        let udp = Row::new(vec![udp, uaddr.to_line().right_aligned()]).yellow();

        let mip = format!(
            "{:?}:{:?}",
            joecalsend::MULTICAST_IP,
            joecalsend::DEFAULT_PORT
        );
        let multicast = "Multicast address";
        let multicast = Row::new(vec![
            multicast.to_line().left_aligned(),
            mip.to_line().right_aligned(),
        ])
        .yellow();

        let haddr = format!("{:?}", joecalsend::LISTENING_SOCKET_ADDR);
        let http = "HTTP address";
        let http = Row::new(vec![
            http.to_line().left_aligned(),
            haddr.to_line().right_aligned(),
        ])
        .yellow();

        let rows = vec![udp, multicast, http];
        let widths = vec![Constraint::Percentage(50), Constraint::Percentage(50)];

        let title = Line::from(" Listeners ".bold()).centered();

        let block = Block::default()
            .title(title)
            .borders(Borders::all())
            .padding(Padding::uniform(1));

        let table = Table::new(rows, widths).block(block);
        table.render(area, buf);
    }
}

// helpers
fn centered_rect(area: Rect, width_pct: u16, height_pct: u16) -> Rect {
    let horizontal = Layout::horizontal([Constraint::Percentage(width_pct)]).flex(Flex::Center);
    let vertical = Layout::vertical([Constraint::Percentage(height_pct)]).flex(Flex::Center);
    let [area] = vertical.areas(area);
    let [area] = horizontal.areas(area);
    area
}