use ratatui::layout::{Alignment, Constraint, Layout, Rect};
use ratatui::style::Style;
use ratatui::text::{Line, Span};
use ratatui::widgets::Paragraph;
use ratatui::Frame;
#[cfg(not(feature = "desktop"))]
use tui_big_text::{BigText, PixelSize};

use crate::state::ui::UiState;
use crate::theme;

pub fn render(frame: &mut Frame, area: Rect, ui: &UiState) {
    let theme = theme::get();
    frame.render_widget(&ui.sparkles, area);

    let author_style = Style::new().fg(theme.title.author);
    let link_style = Style::new().fg(theme.title.link);
    let license_style = Style::new().fg(theme.title.license);

    #[cfg(not(feature = "desktop"))]
    let big_title = BigText::builder()
        .pixel_size(PixelSize::Full)
        .style(Style::new().fg(theme.title.big_title).bold())
        .lines(vec!["CAGIRE".into()])
        .centered()
        .build();

    #[cfg(feature = "desktop")]
    let big_title = Paragraph::new(Line::from(Span::styled(
        "CAGIRE",
        Style::new().fg(theme.title.big_title).bold(),
    )))
    .alignment(Alignment::Center);

    let version_style = Style::new().fg(theme.title.subtitle);

    let subtitle_lines = vec![
        Line::from(""),
        Line::from(Span::styled(
            "A Forth Music Sequencer",
            Style::new().fg(theme.title.subtitle),
        )),
        Line::from(Span::styled(
            format!("v{}", env!("CARGO_PKG_VERSION")),
            version_style,
        )),
        Line::from(""),
        Line::from(Span::styled("by BuboBubo", author_style)),
        Line::from(""),
        Line::from(Span::styled("https://raphaelforment.fr", link_style)),
        Line::from(""),
        Line::from(Span::styled("AGPL-3.0", license_style)),
        Line::from(""),
        Line::from(""),
        Line::from(Span::styled(
            "Press any key to continue",
            Style::new().fg(theme.title.prompt),
        )),
    ];

    #[cfg(not(feature = "desktop"))]
    let big_text_height = 8;
    #[cfg(feature = "desktop")]
    let big_text_height = 1;
    let min_title_width = 30;
    let subtitle_height = subtitle_lines.len() as u16;

    let show_big_title =
        area.height >= (big_text_height + subtitle_height) && area.width >= min_title_width;

    if show_big_title {
        let total_height = big_text_height + subtitle_height;
        let vertical_padding = area.height.saturating_sub(total_height) / 2;

        let [_, title_area, subtitle_area, _] = Layout::vertical([
            Constraint::Length(vertical_padding),
            Constraint::Length(big_text_height),
            Constraint::Length(subtitle_height),
            Constraint::Fill(1),
        ])
        .areas(area);

        frame.render_widget(big_title, title_area);

        let subtitle = Paragraph::new(subtitle_lines).alignment(Alignment::Center);
        frame.render_widget(subtitle, subtitle_area);
    } else {
        let vertical_padding = area.height.saturating_sub(subtitle_height) / 2;

        let [_, subtitle_area, _] = Layout::vertical([
            Constraint::Length(vertical_padding),
            Constraint::Length(subtitle_height),
            Constraint::Fill(1),
        ])
        .areas(area);

        let subtitle = Paragraph::new(subtitle_lines).alignment(Alignment::Center);
        frame.render_widget(subtitle, subtitle_area);
    }
}