use crate::App;

use ratatui::{
    buffer::Buffer,
    crossterm::event::{self, KeyCode, KeyEvent, KeyEventKind},
    layout::{Constraint, Flex, Layout, Rect},
    style::{Modifier, Style, Stylize, palette::tailwind::*},
    text::{Line, Span},
    widgets::{
        Block, Borders, HighlightSpacing, List, ListState, Padding, Paragraph, StatefulWidget,
        Widget,
    },
};

const GAME_HEADER_STYLE: Style = Style::new()
    .fg(NEUTRAL.c100)
    .bg(BLUE.c600)
    .add_modifier(Modifier::BOLD);
const PROFILE_HEADER_STYLE: Style = Style::new()
    .fg(NEUTRAL.c100)
    .bg(VIOLET.c600)
    .add_modifier(Modifier::BOLD);

const HEADER_STYLE: Style = Style::new().fg(ROSE.c500).add_modifier(Modifier::BOLD);
const SELECTED_STYLE: Style = Style::new().bg(NEUTRAL.c700).add_modifier(Modifier::BOLD);

const FOOTER_LEFT_STYLE: Style = Style::new().fg(PURPLE.c400).add_modifier(Modifier::BOLD);
const FOOTER_RIGHT_STYLE: Style = Style::new().fg(LIME.c400);

pub struct MenuList {
    items: Vec<&'static str>,
    state: ListState,
}

impl FromIterator<&'static str> for MenuList {
    fn from_iter<I: IntoIterator<Item = &'static str>>(iter: I) -> Self {
        let items = iter.into_iter().collect();
        let state = ListState::default();
        Self { items, state }
    }
}

impl Default for App {
    fn default() -> Self {
        Self {
            should_exit: false,
            menu: MenuList::from_iter(["40L", "Blitz", "txLadder", "Config"]),
        }
    }
}

impl App {
    fn render_header(&mut self, area: Rect, buf: &mut Buffer) {
        Block::new()
            .title(Line::raw("  txtris  ").centered().style(HEADER_STYLE))
            .borders(Borders::TOP)
            .render(area, buf);
    }

    fn render_footer(&mut self, area: Rect, buf: &mut Buffer) {
        Block::new()
            .title(
                Line::raw(" Atiran © 2025 ")
                    .left_aligned()
                    .style(FOOTER_LEFT_STYLE),
            )
            .title(
                Line::raw(format!("v{} ", env!("CARGO_PKG_VERSION")))
                    .right_aligned()
                    .style(FOOTER_RIGHT_STYLE),
            )
            .borders(Borders::BOTTOM)
            .render(area, buf);
    }

    fn render_list(&mut self, area: Rect, buf: &mut Buffer) {
        let block = Block::new()
            .title(Line::raw(" Game ").centered().style(GAME_HEADER_STYLE))
            .padding(Padding::symmetric(2, 1))
            .borders(Borders::ALL);

        let items: Vec<&'static str> = self.menu.items.clone();

        let list = List::new(items)
            .block(block)
            .highlight_style(SELECTED_STYLE)
            .highlight_symbol(" ")
            .highlight_spacing(HighlightSpacing::Always);

        StatefulWidget::render(list, area, buf, &mut self.menu.state);
    }

    fn render_profile(&mut self, area: Rect, buf: &mut Buffer) {
        let block = Block::new()
            .title(
                Line::raw(" Profile ")
                    .centered()
                    .style(PROFILE_HEADER_STYLE),
            )
            .padding(Padding::symmetric(3, 1))
            .borders(Borders::ALL);

        let text = vec![
            Line::from(Span::styled("<Username>", Style::new().bold().underlined())),
            Line::from(vec![
                Span::styled("40L: ", Style::new().blue()),
                Span::raw("N/A"),
            ]),
            Line::from(vec![
                Span::styled("Blitz: ", Style::new().green()),
                Span::raw("N/A"),
            ]),
            Line::from(vec![
                Span::styled("txLadder: ", Style::new().magenta()),
                Span::raw("N/A"),
            ]),
        ];

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

    pub fn handle_key(&mut self, key: KeyEvent) {
        if key.kind != KeyEventKind::Press {
            return;
        }
        match key.code {
            KeyCode::Char('q') | KeyCode::Esc => self.should_exit = true,
            KeyCode::Char('j') | KeyCode::Down => self.select_next(),
            KeyCode::Char('k') | KeyCode::Up => self.select_previous(),
            KeyCode::Char('c') => {
                if key.modifiers.contains(event::KeyModifiers::CONTROL) {
                    self.should_exit = true;
                }
            }
            _ => {}
        }
    }

    fn select_next(&mut self) {
        self.menu.state.select_next();
    }
    fn select_previous(&mut self) {
        self.menu.state.select_previous();
    }
}

fn center(area: Rect, horizontal: Constraint, vertical: Constraint) -> Rect {
    let [area] = Layout::horizontal([horizontal])
        .flex(Flex::Center)
        .areas(area);
    let [area] = Layout::vertical([vertical]).flex(Flex::Center).areas(area);
    area
}

impl Widget for &mut App {
    fn render(self, area: Rect, buf: &mut Buffer) {
        let [header_area, main_area, footer_area] = Layout::vertical([
            Constraint::Length(1),
            Constraint::Fill(1),
            Constraint::Length(2),
        ])
        .areas(area);

        let center_area = center(
            main_area,
            Constraint::Length(50),
            Constraint::Percentage(60),
        );

        let [profile_area, list_outer_area] =
            Layout::vertical([Constraint::Percentage(50), Constraint::Percentage(50)])
                .areas(center_area);

        self.render_header(header_area, buf);
        self.render_profile(profile_area, buf);
        self.render_list(list_outer_area, buf);
        self.render_footer(footer_area, buf);
    }
}