essh 0.3.2

use ratatui::prelude::Color;

/// Semantic color roles for the ESSH TUI.
#[derive(Debug, Clone)]
// Some slots are unused by the current screens but are part of the theme
// contract every palette must fill, so they stay.
#[allow(dead_code)]
pub struct Theme {
    pub name: &'static str,

    // Brand / chrome
    pub brand: Color,
    pub active_tab: Color,
    pub inactive_tab: Color,
    pub border: Color,
    pub separator: Color,

    // Text
    pub text_primary: Color,
    pub text_secondary: Color,
    pub text_muted: Color,
    pub text_inverse: Color,

    // Status / semantic
    pub status_good: Color,
    pub status_warn: Color,
    pub status_error: Color,
    pub status_info: Color,

    // Data
    pub rx_rate: Color,
    pub tx_rate: Color,
    pub key_hint: Color,

    // Selection
    pub selection_bg: Color,
    pub highlight_bg: Color,
}

pub const THEME_NAMES: &[&str] = &["dark", "light", "solarized", "dracula", "nord"];

pub fn by_name(name: &str) -> Theme {
    match name.to_lowercase().as_str() {
        "light" => light(),
        "solarized" => solarized(),
        "dracula" => dracula(),
        "nord" => nord(),
        _ => dark(),
    }
}

pub fn next_theme_name(current: &str) -> &'static str {
    let idx = THEME_NAMES
        .iter()
        .position(|name| *name == current)
        .unwrap_or(0);
    THEME_NAMES[(idx + 1) % THEME_NAMES.len()]
}

/// The ESSH 2.0 theme: the *Watch 2.0 family palette from the design
/// handoff. Every value comes from [`crate::design`] rather than being
/// respelled here, so the design system stays the single source.
pub fn dark() -> Theme {
    use crate::design as d;
    Theme {
        name: "dark",
        brand: d::CYAN,
        active_tab: d::WHITE,
        inactive_tab: d::DIM,
        // FAINT, not RULE. `RULE` (#1c282e) is the handoff's 1px hairline;
        // as a full box-drawing cell on #0c1418 it is invisible, which is why
        // the panels read as floating labels. This is the terminal-weight
        // equivalent, and matches netwatch's DarkGray.
        border: d::FAINT,
        separator: d::RULE,
        text_primary: d::FG,
        text_secondary: d::DIM,
        text_muted: d::DIM,
        text_inverse: d::BG,
        status_good: d::GREEN,
        status_warn: d::AMBER,
        status_error: d::RED,
        status_info: d::CYAN,
        rx_rate: d::CYAN,
        tx_rate: d::VIOLET,
        key_hint: d::CYAN,
        selection_bg: d::ROW_SELECTED_BG,
        highlight_bg: d::ROW_SELECTED_BG,
    }
}

pub fn light() -> Theme {
    Theme {
        name: "light",
        brand: Color::Rgb(0, 120, 180),
        active_tab: Color::Rgb(180, 100, 0),
        inactive_tab: Color::Rgb(140, 140, 140),
        border: Color::Rgb(180, 180, 180),
        separator: Color::Rgb(180, 180, 180),
        text_primary: Color::Rgb(30, 30, 30),
        text_secondary: Color::Rgb(80, 80, 80),
        text_muted: Color::Rgb(140, 140, 140),
        text_inverse: Color::White,
        status_good: Color::Rgb(0, 140, 60),
        status_warn: Color::Rgb(200, 140, 0),
        status_error: Color::Rgb(200, 40, 40),
        status_info: Color::Rgb(0, 120, 180),
        rx_rate: Color::Rgb(0, 140, 60),
        tx_rate: Color::Rgb(0, 90, 180),
        key_hint: Color::Rgb(180, 100, 0),
        selection_bg: Color::Rgb(220, 230, 240),
        highlight_bg: Color::Rgb(200, 215, 230),
    }
}

pub fn solarized() -> Theme {
    let base03 = Color::Rgb(0, 43, 54);
    let base01 = Color::Rgb(88, 110, 117);
    let base0 = Color::Rgb(131, 148, 150);
    let base1 = Color::Rgb(147, 161, 161);
    let yellow = Color::Rgb(181, 137, 0);
    let orange = Color::Rgb(203, 75, 22);
    let red = Color::Rgb(220, 50, 47);
    let green = Color::Rgb(133, 153, 0);
    let cyan = Color::Rgb(42, 161, 152);
    let blue = Color::Rgb(38, 139, 210);
    let violet = Color::Rgb(108, 113, 196);

    Theme {
        name: "solarized",
        brand: cyan,
        active_tab: yellow,
        inactive_tab: base01,
        border: base01,
        separator: base01,
        text_primary: base0,
        text_secondary: base1,
        text_muted: base01,
        text_inverse: base03,
        status_good: green,
        status_warn: yellow,
        status_error: red,
        status_info: cyan,
        rx_rate: green,
        tx_rate: blue,
        key_hint: orange,
        selection_bg: Color::Rgb(7, 54, 66),
        highlight_bg: violet,
    }
}

pub fn dracula() -> Theme {
    let bg = Color::Rgb(40, 42, 54);
    let fg = Color::Rgb(248, 248, 242);
    let comment = Color::Rgb(98, 114, 164);
    let cyan = Color::Rgb(139, 233, 253);
    let green = Color::Rgb(80, 250, 123);
    let orange = Color::Rgb(255, 184, 108);
    let pink = Color::Rgb(255, 121, 198);
    let purple = Color::Rgb(189, 147, 249);
    let red = Color::Rgb(255, 85, 85);
    let yellow = Color::Rgb(241, 250, 140);

    Theme {
        name: "dracula",
        brand: purple,
        active_tab: pink,
        inactive_tab: comment,
        border: comment,
        separator: comment,
        text_primary: fg,
        text_secondary: Color::Rgb(200, 200, 210),
        text_muted: comment,
        text_inverse: bg,
        status_good: green,
        status_warn: yellow,
        status_error: red,
        status_info: cyan,
        rx_rate: green,
        tx_rate: cyan,
        key_hint: orange,
        selection_bg: Color::Rgb(68, 71, 90),
        highlight_bg: Color::Rgb(98, 114, 164),
    }
}

pub fn nord() -> Theme {
    let polar0 = Color::Rgb(46, 52, 64);
    let snow0 = Color::Rgb(216, 222, 233);
    let snow1 = Color::Rgb(229, 233, 240);
    let frost0 = Color::Rgb(143, 188, 187);
    let frost1 = Color::Rgb(136, 192, 208);
    let frost2 = Color::Rgb(129, 161, 193);
    let frost3 = Color::Rgb(94, 129, 172);
    let aurora_red = Color::Rgb(191, 97, 106);
    let aurora_orange = Color::Rgb(208, 135, 112);
    let aurora_yellow = Color::Rgb(235, 203, 139);
    let aurora_green = Color::Rgb(163, 190, 140);

    Theme {
        name: "nord",
        brand: frost1,
        active_tab: frost0,
        inactive_tab: frost3,
        border: Color::Rgb(67, 76, 94),
        separator: Color::Rgb(67, 76, 94),
        text_primary: snow0,
        text_secondary: snow1,
        text_muted: Color::Rgb(76, 86, 106),
        text_inverse: polar0,
        status_good: aurora_green,
        status_warn: aurora_yellow,
        status_error: aurora_red,
        status_info: frost1,
        rx_rate: aurora_green,
        tx_rate: frost2,
        key_hint: aurora_orange,
        selection_bg: Color::Rgb(59, 66, 82),
        highlight_bg: Color::Rgb(76, 86, 106),
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn all_builtin_themes_load() {
        for name in THEME_NAMES {
            let theme = by_name(name);
            assert_eq!(theme.name, *name);
        }
    }

    #[test]
    fn unknown_theme_falls_back_to_dark() {
        let theme = by_name("nonexistent");
        assert_eq!(theme.name, "dark");
    }

    #[test]
    fn next_theme_wraps() {
        assert_eq!(next_theme_name("dark"), "light");
        assert_eq!(next_theme_name("nord"), "dark");
    }
}