use crate::color::blend;use crate::color::is_light;use crate::terminal_palette::StdoutColorLevel;use crate::terminal_palette::best_color;use crate::terminal_palette::default_bg;use crate::terminal_palette::default_fg;use crate::terminal_palette::rgb_color;use crate::terminal_palette::stdout_color_level;use ratatui::style::Color;use ratatui::style::Style;use ratatui::style::Stylize;const LIGHT_BG_ACCENT_RGB: (u8, u8, u8) = (0, 95, 135);// Decorative table rules should remain visible without competing with cell content.const TABLE_SEPARATOR_FG_ALPHA: f32 = 0.20;pub fn user_message_style() -> Style {    user_message_style_for(default_bg())}pub fn proposed_plan_style() -> Style {    proposed_plan_style_for(default_bg())}/// Returns a low-contrast rule style for separators within markdown tables.pub(crate) fn table_separator_style() -> Style {    table_separator_style_for(default_fg(), default_bg(), stdout_color_level())}/// Returns the shared accent style for active or selected TUI controls.pub(crate) fn accent_style() -> Style {    accent_style_for(default_bg())}/// Returns the style for a user-authored message using the provided terminal background.pub fn user_message_style_for(terminal_bg: Option<(u8, u8, u8)>) -> Style {    match terminal_bg {        Some(bg) => Style::default().bg(user_message_bg(bg)),        None => Style::default(),    }}pub fn proposed_plan_style_for(terminal_bg: Option<(u8, u8, u8)>) -> Style {    match terminal_bg {        Some(bg) => Style::default().bg(proposed_plan_bg(bg)),        None => Style::default(),    }}/// Returns the shared accent style for the provided terminal background.pub(crate) fn accent_style_for(terminal_bg: Option<(u8, u8, u8)>) -> Style {    if terminal_bg.is_some_and(is_light) {        Style::default().fg(best_color(LIGHT_BG_ACCENT_RGB)).bold()    } else {        Style::default().fg(Color::Cyan).bold()    }}fn table_separator_style_for(    terminal_fg: Option<(u8, u8, u8)>,    terminal_bg: Option<(u8, u8, u8)>,    color_level: StdoutColorLevel,) -> Style {    let (Some(fg), Some(bg)) = (terminal_fg, terminal_bg) else {        return Style::default().dim();    };    let separator_rgb = blend(fg, bg, TABLE_SEPARATOR_FG_ALPHA);    match color_level {        StdoutColorLevel::TrueColor => Style::default().fg(rgb_color(separator_rgb)),        StdoutColorLevel::Ansi256 => Style::default().fg(best_color(separator_rgb)),        StdoutColorLevel::Ansi16 | StdoutColorLevel::Unknown => Style::default().dim(),    }}#[allow(clippy::disallowed_methods)]pub fn user_message_bg(terminal_bg: (u8, u8, u8)) -> Color {    let (top, alpha) = if is_light(terminal_bg) {        ((0, 0, 0), 0.04)    } else {        ((255, 255, 255), 0.12)    };    best_color(blend(top, terminal_bg, alpha))}#[allow(clippy::disallowed_methods)]pub fn proposed_plan_bg(terminal_bg: (u8, u8, u8)) -> Color {    user_message_bg(terminal_bg)}#[cfg(test)]mod tests {    use super::*;    use pretty_assertions::assert_eq;    use ratatui::style::Modifier;    #[test]    fn accent_style_uses_darker_cyan_on_light_backgrounds() {        let style = accent_style_for(Some((255, 255, 255)));        assert_eq!(style.fg, Some(best_color(LIGHT_BG_ACCENT_RGB)));        assert!(style.add_modifier.contains(Modifier::BOLD));    }    #[test]    fn accent_style_uses_cyan_on_dark_or_unknown_backgrounds() {        let expected = Style::default().fg(Color::Cyan).bold();        assert_eq!(accent_style_for(Some((0, 0, 0))), expected);        assert_eq!(accent_style_for(/*terminal_bg*/ None), expected);    }    #[test]    fn table_separator_blends_toward_dark_background() {        let style = table_separator_style_for(            Some((255, 255, 255)),            Some((0, 0, 0)),            StdoutColorLevel::TrueColor,        );        assert_eq!(style.fg, Some(rgb_color((51, 51, 51))));    }    #[test]    fn table_separator_blends_toward_light_background() {        let style = table_separator_style_for(            Some((0, 0, 0)),            Some((255, 255, 255)),            StdoutColorLevel::TrueColor,        );        assert_eq!(style.fg, Some(rgb_color((204, 204, 204))));    }    #[test]    fn table_separator_dims_when_palette_aware_color_is_unavailable() {        let expected = Style::default().dim();        assert_eq!(            table_separator_style_for(                Some((255, 255, 255)),                Some((0, 0, 0)),                StdoutColorLevel::Ansi16,            ),            expected        );        assert_eq!(            table_separator_style_for(                /*terminal_fg*/ None,                Some((0, 0, 0)),                StdoutColorLevel::TrueColor,            ),            expected        );    }}