par_term_config/

types.rs

//! Configuration types and enums.

use serde::{Deserialize, Serialize};
use std::path::PathBuf;

// ============================================================================
// Keybinding Types
// ============================================================================

/// Keyboard modifier for keybindings.
///
/// This enum is exported for potential future use (e.g., custom keybinding UI).
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
#[serde(rename_all = "lowercase")]
#[allow(dead_code)]
pub enum KeyModifier {
    /// Control key
    Ctrl,
    /// Alt/Option key
    Alt,
    /// Shift key
    Shift,
    /// Cmd on macOS, Ctrl on other platforms (cross-platform convenience)
    CmdOrCtrl,
    /// Always the Cmd/Super/Windows key
    Super,
}

/// A keybinding configuration entry
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub struct KeyBinding {
    /// Key combination string, e.g., "CmdOrCtrl+Shift+B"
    pub key: String,
    /// Action name, e.g., "toggle_background_shader"
    pub action: String,
}

/// VSync mode (presentation mode)
#[derive(Debug, Clone, Copy, PartialEq, Eq, Deserialize, Serialize, Default)]
#[serde(rename_all = "lowercase")]
pub enum VsyncMode {
    /// No VSync - render as fast as possible (lowest latency, highest GPU usage)
    Immediate,
    /// Mailbox VSync - cap at monitor refresh rate with triple buffering (balanced)
    Mailbox,
    /// FIFO VSync - strict vsync with double buffering (lowest GPU usage, most compatible)
    #[default]
    Fifo,
}

impl VsyncMode {
    /// Convert to wgpu::PresentMode
    #[cfg(feature = "wgpu-types")]
    pub fn to_present_mode(self) -> wgpu::PresentMode {
        match self {
            VsyncMode::Immediate => wgpu::PresentMode::Immediate,
            VsyncMode::Mailbox => wgpu::PresentMode::Mailbox,
            VsyncMode::Fifo => wgpu::PresentMode::Fifo,
        }
    }
}

/// GPU power preference for adapter selection
///
/// Controls which GPU adapter is preferred when multiple GPUs are available
/// (e.g., integrated Intel GPU vs discrete NVIDIA/AMD GPU).
#[derive(Debug, Clone, Copy, PartialEq, Eq, Deserialize, Serialize, Default)]
#[serde(rename_all = "snake_case")]
pub enum PowerPreference {
    /// No preference - let the system decide (default)
    #[default]
    None,
    /// Prefer integrated GPU (Intel/AMD iGPU) - saves battery
    LowPower,
    /// Prefer discrete GPU (NVIDIA/AMD) - maximum performance
    HighPerformance,
}

impl PowerPreference {
    /// Convert to wgpu::PowerPreference
    #[cfg(feature = "wgpu-types")]
    pub fn to_wgpu(self) -> wgpu::PowerPreference {
        match self {
            PowerPreference::None => wgpu::PowerPreference::None,
            PowerPreference::LowPower => wgpu::PowerPreference::LowPower,
            PowerPreference::HighPerformance => wgpu::PowerPreference::HighPerformance,
        }
    }

    /// Display name for UI
    pub fn display_name(&self) -> &'static str {
        match self {
            PowerPreference::None => "None (System Default)",
            PowerPreference::LowPower => "Low Power (Integrated GPU)",
            PowerPreference::HighPerformance => "High Performance (Discrete GPU)",
        }
    }

    /// All available power preferences for UI iteration
    pub fn all() -> &'static [PowerPreference] {
        &[
            PowerPreference::None,
            PowerPreference::LowPower,
            PowerPreference::HighPerformance,
        ]
    }
}

/// Cursor style
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "lowercase")]
pub enum CursorStyle {
    /// Block cursor (fills entire cell)
    #[default]
    Block,
    /// Beam cursor (vertical line at cell start)
    Beam,
    /// Underline cursor (horizontal line at cell bottom)
    Underline,
}

/// Unfocused cursor style - how the cursor appears when window loses focus
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "lowercase")]
pub enum UnfocusedCursorStyle {
    /// Show outline-only (hollow) block cursor when unfocused
    #[default]
    Hollow,
    /// Keep same cursor style when unfocused
    Same,
    /// Hide cursor completely when unfocused
    Hidden,
}

/// Image scaling quality for inline graphics (Sixel, iTerm2, Kitty)
///
/// Controls the GPU texture sampling filter used when scaling inline images.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "lowercase")]
pub enum ImageScalingMode {
    /// Nearest-neighbor filtering - sharp pixels, good for pixel art
    Nearest,
    /// Bilinear filtering - smooth scaling (default)
    #[default]
    Linear,
}

impl ImageScalingMode {
    /// Display name for UI
    pub fn display_name(&self) -> &'static str {
        match self {
            ImageScalingMode::Nearest => "Nearest (Sharp)",
            ImageScalingMode::Linear => "Linear (Smooth)",
        }
    }

    /// All available modes for UI iteration
    pub fn all() -> &'static [ImageScalingMode] {
        &[ImageScalingMode::Nearest, ImageScalingMode::Linear]
    }

    /// Convert to wgpu FilterMode
    #[cfg(feature = "wgpu-types")]
    pub fn to_filter_mode(self) -> wgpu::FilterMode {
        match self {
            ImageScalingMode::Nearest => wgpu::FilterMode::Nearest,
            ImageScalingMode::Linear => wgpu::FilterMode::Linear,
        }
    }
}

/// Background image display mode
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "lowercase")]
pub enum BackgroundImageMode {
    /// Scale to fit window while maintaining aspect ratio (may have letterboxing)
    Fit,
    /// Scale to fill window while maintaining aspect ratio (may crop edges)
    Fill,
    /// Stretch to fill window exactly (ignores aspect ratio)
    #[default]
    Stretch,
    /// Repeat image in a tiled pattern at original size
    Tile,
    /// Center image at original size (no scaling)
    Center,
}

/// Default save location for downloaded files
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "snake_case")]
pub enum DownloadSaveLocation {
    /// Save to ~/Downloads (default)
    #[default]
    Downloads,
    /// Remember and re-use the last directory the user saved to
    LastUsed,
    /// Use the shell's current working directory
    Cwd,
    /// Use a custom directory path
    Custom(String),
}

impl DownloadSaveLocation {
    /// Get all non-Custom variants for settings UI dropdown
    pub fn variants() -> &'static [DownloadSaveLocation] {
        &[
            DownloadSaveLocation::Downloads,
            DownloadSaveLocation::LastUsed,
            DownloadSaveLocation::Cwd,
        ]
    }

    /// Display name for settings UI
    pub fn display_name(&self) -> &str {
        match self {
            DownloadSaveLocation::Downloads => "Downloads folder",
            DownloadSaveLocation::LastUsed => "Last used directory",
            DownloadSaveLocation::Cwd => "Current working directory",
            DownloadSaveLocation::Custom(_) => "Custom directory",
        }
    }
}

/// Background source selection
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "lowercase")]
pub enum BackgroundMode {
    /// Use theme's default background color
    #[default]
    Default,
    /// Use a custom solid color
    Color,
    /// Use a background image
    Image,
}

/// Per-pane background image configuration (for config persistence)
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct PaneBackgroundConfig {
    /// Pane index (0-based)
    pub index: usize,
    /// Image path
    pub image: String,
    /// Display mode
    #[serde(default)]
    pub mode: BackgroundImageMode,
    /// Opacity
    #[serde(default = "crate::defaults::background_image_opacity")]
    pub opacity: f32,
    /// Darken amount (0.0 = no darkening, 1.0 = fully black)
    #[serde(default = "crate::defaults::pane_background_darken")]
    pub darken: f32,
}

/// Tab visual style preset
///
/// Controls the cosmetic appearance of tabs (colors, sizes, spacing).
/// Each preset applies a set of color/size/spacing adjustments to the tab bar.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "snake_case")]
pub enum TabStyle {
    /// Default dark theme styling
    #[default]
    Dark,
    /// Light theme tab styling
    Light,
    /// Smaller tabs, more visible terminal content
    Compact,
    /// Clean, minimal tab appearance
    Minimal,
    /// Enhanced contrast for accessibility
    HighContrast,
    /// Automatically switch between light/dark styles based on system theme
    Automatic,
}

impl TabStyle {
    /// Display name for UI
    pub fn display_name(&self) -> &'static str {
        match self {
            TabStyle::Dark => "Dark",
            TabStyle::Light => "Light",
            TabStyle::Compact => "Compact",
            TabStyle::Minimal => "Minimal",
            TabStyle::HighContrast => "High Contrast",
            TabStyle::Automatic => "Automatic",
        }
    }

    /// All available styles for UI iteration
    pub fn all() -> &'static [TabStyle] {
        &[
            TabStyle::Dark,
            TabStyle::Light,
            TabStyle::Compact,
            TabStyle::Minimal,
            TabStyle::HighContrast,
            TabStyle::Automatic,
        ]
    }

    /// All concrete styles (excludes Automatic) — for sub-style dropdowns
    pub fn all_concrete() -> &'static [TabStyle] {
        &[
            TabStyle::Dark,
            TabStyle::Light,
            TabStyle::Compact,
            TabStyle::Minimal,
            TabStyle::HighContrast,
        ]
    }
}

/// Tab bar position
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "snake_case")]
pub enum TabBarPosition {
    /// Tab bar at the top of the window (default)
    #[default]
    Top,
    /// Tab bar at the bottom of the window
    Bottom,
    /// Tab bar on the left side of the window (vertical layout)
    Left,
}

impl TabBarPosition {
    /// Display name for UI
    pub fn display_name(&self) -> &'static str {
        match self {
            TabBarPosition::Top => "Top",
            TabBarPosition::Bottom => "Bottom",
            TabBarPosition::Left => "Left",
        }
    }

    /// All available positions for UI iteration
    pub fn all() -> &'static [TabBarPosition] {
        &[
            TabBarPosition::Top,
            TabBarPosition::Bottom,
            TabBarPosition::Left,
        ]
    }

    /// Returns true if the tab bar is horizontal (top or bottom)
    pub fn is_horizontal(&self) -> bool {
        matches!(self, TabBarPosition::Top | TabBarPosition::Bottom)
    }
}

/// Tab bar visibility mode
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "snake_case")]
pub enum TabBarMode {
    /// Always show tab bar (default)
    #[default]
    Always,
    /// Show tab bar only when there are multiple tabs
    WhenMultiple,
    /// Never show tab bar
    Never,
}

/// Controls how tab titles are automatically updated
#[derive(Debug, Clone, Copy, PartialEq, Eq, Deserialize, Serialize, Default)]
#[serde(rename_all = "snake_case")]
pub enum TabTitleMode {
    /// OSC title first, then CWD from shell integration, then keep default
    #[default]
    Auto,
    /// Only update from explicit OSC escape sequences; never auto-set from CWD
    OscOnly,
}

/// Status bar position
#[derive(Debug, Clone, Copy, PartialEq, Eq, Deserialize, Serialize, Default)]
#[serde(rename_all = "lowercase")]
pub enum StatusBarPosition {
    /// Status bar at the top of the window
    Top,
    /// Status bar at the bottom of the window (default)
    #[default]
    Bottom,
}

/// Window type for different display modes
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "snake_case")]
pub enum WindowType {
    /// Normal window (default)
    #[default]
    Normal,
    /// Start in fullscreen mode
    Fullscreen,
    /// Edge-anchored window (for dropdown/Quake-style terminals)
    /// Note: Edge-anchored windows require additional platform-specific support
    EdgeTop,
    /// Edge-anchored to bottom of screen
    EdgeBottom,
    /// Edge-anchored to left of screen
    EdgeLeft,
    /// Edge-anchored to right of screen
    EdgeRight,
}

impl WindowType {
    /// Display name for UI
    pub fn display_name(&self) -> &'static str {
        match self {
            WindowType::Normal => "Normal",
            WindowType::Fullscreen => "Fullscreen",
            WindowType::EdgeTop => "Edge (Top)",
            WindowType::EdgeBottom => "Edge (Bottom)",
            WindowType::EdgeLeft => "Edge (Left)",
            WindowType::EdgeRight => "Edge (Right)",
        }
    }

    /// All available window types for UI iteration
    pub fn all() -> &'static [WindowType] {
        &[
            WindowType::Normal,
            WindowType::Fullscreen,
            WindowType::EdgeTop,
            WindowType::EdgeBottom,
            WindowType::EdgeLeft,
            WindowType::EdgeRight,
        ]
    }

    /// Returns true if this is an edge-anchored window type
    pub fn is_edge(&self) -> bool {
        matches!(
            self,
            WindowType::EdgeTop
                | WindowType::EdgeBottom
                | WindowType::EdgeLeft
                | WindowType::EdgeRight
        )
    }
}

/// Quote style for dropped file paths
///
/// Controls how filenames containing special characters are quoted when dropped into the terminal.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "snake_case")]
pub enum DroppedFileQuoteStyle {
    /// Single quotes - safest for most shells (handles $, !, spaces, etc.)
    /// Example: '/path/to/file with spaces.txt'
    #[default]
    SingleQuotes,
    /// Double quotes - allows variable expansion
    /// Example: "/path/to/file with spaces.txt"
    DoubleQuotes,
    /// Backslash escaping - escape individual special characters
    /// Example: /path/to/file\ with\ spaces.txt
    Backslash,
    /// No quoting - insert path as-is (not recommended for paths with special chars)
    None,
}

impl DroppedFileQuoteStyle {
    /// Display name for UI
    pub fn display_name(&self) -> &'static str {
        match self {
            DroppedFileQuoteStyle::SingleQuotes => "Single quotes ('...')",
            DroppedFileQuoteStyle::DoubleQuotes => "Double quotes (\"...\")",
            DroppedFileQuoteStyle::Backslash => "Backslash escaping (\\)",
            DroppedFileQuoteStyle::None => "None (raw path)",
        }
    }

    /// All available quote styles for UI iteration
    pub fn all() -> &'static [DroppedFileQuoteStyle] {
        &[
            DroppedFileQuoteStyle::SingleQuotes,
            DroppedFileQuoteStyle::DoubleQuotes,
            DroppedFileQuoteStyle::Backslash,
            DroppedFileQuoteStyle::None,
        ]
    }
}

/// Option/Alt key behavior mode
///
/// Controls what happens when Option (macOS) or Alt (Linux/Windows) key is pressed
/// with a character key. This is essential for emacs and vim users who rely on
/// Meta key combinations (M-x, M-f, M-b, etc.).
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "lowercase")]
pub enum OptionKeyMode {
    /// Normal - sends special characters (default macOS behavior)
    /// Option+f → ƒ (special character)
    Normal,
    /// Meta - sets the high bit (8th bit) on the character
    /// Option+f → 0xE6 (f with high bit set)
    Meta,
    /// Esc - sends Escape prefix before the character (most compatible)
    /// Option+f → ESC f (escape then f)
    /// This is the most compatible mode for terminal applications like emacs and vim
    #[default]
    Esc,
}

// ============================================================================
// Modifier Remapping Types
// ============================================================================

/// Target modifier for remapping.
///
/// Allows remapping one modifier key to behave as another.
/// For example, remap Caps Lock to Ctrl, or swap Ctrl and Super.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "lowercase")]
pub enum ModifierTarget {
    /// No remapping - use the key's normal function
    #[default]
    None,
    /// Remap to Control key
    Ctrl,
    /// Remap to Alt/Option key
    Alt,
    /// Remap to Shift key
    Shift,
    /// Remap to Super/Cmd/Windows key
    Super,
}

impl ModifierTarget {
    /// Display name for UI
    pub fn display_name(&self) -> &'static str {
        match self {
            ModifierTarget::None => "None (disabled)",
            ModifierTarget::Ctrl => "Ctrl",
            ModifierTarget::Alt => "Alt/Option",
            ModifierTarget::Shift => "Shift",
            ModifierTarget::Super => "Super/Cmd",
        }
    }

    /// All available targets for UI iteration
    pub fn all() -> &'static [ModifierTarget] {
        &[
            ModifierTarget::None,
            ModifierTarget::Ctrl,
            ModifierTarget::Alt,
            ModifierTarget::Shift,
            ModifierTarget::Super,
        ]
    }
}

/// Modifier remapping configuration.
///
/// Allows users to remap modifier keys to different functions.
/// This is useful for:
/// - Swapping Ctrl and Caps Lock
/// - Using Ctrl as Cmd on macOS
/// - Customizing modifier layout for ergonomic keyboards
#[derive(Debug, Clone, Copy, PartialEq, Eq, Default, Serialize, Deserialize)]
pub struct ModifierRemapping {
    /// What the left Ctrl key should act as
    #[serde(default)]
    pub left_ctrl: ModifierTarget,
    /// What the right Ctrl key should act as
    #[serde(default)]
    pub right_ctrl: ModifierTarget,
    /// What the left Alt key should act as
    #[serde(default)]
    pub left_alt: ModifierTarget,
    /// What the right Alt key should act as
    #[serde(default)]
    pub right_alt: ModifierTarget,
    /// What the left Super/Cmd key should act as
    #[serde(default)]
    pub left_super: ModifierTarget,
    /// What the right Super/Cmd key should act as
    #[serde(default)]
    pub right_super: ModifierTarget,
}

/// Font mapping for a specific Unicode range
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct FontRange {
    /// Start of Unicode range (inclusive), e.g., 0x4E00 for CJK
    pub start: u32,
    /// End of Unicode range (inclusive), e.g., 0x9FFF for CJK
    pub end: u32,
    /// Font family name to use for this range
    pub font_family: String,
}

/// Thin strokes / font smoothing mode
///
/// Controls font stroke weight adjustment for improved rendering,
/// particularly on high-DPI/Retina displays. Inspired by iTerm2's thin strokes feature.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "snake_case")]
pub enum ThinStrokesMode {
    /// Never apply thin strokes
    Never,
    /// Apply thin strokes only on Retina/HiDPI displays (default)
    #[default]
    RetinaOnly,
    /// Apply thin strokes only on dark backgrounds
    DarkBackgroundsOnly,
    /// Apply thin strokes only on Retina displays with dark backgrounds
    RetinaDarkBackgroundsOnly,
    /// Always apply thin strokes
    Always,
}

/// Shader install prompt mode
///
/// Controls whether the user is prompted to install shaders when the shaders
/// folder is missing or empty on startup.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "snake_case")]
pub enum ShaderInstallPrompt {
    /// Ask the user if they want to install shaders (default)
    #[default]
    Ask,
    /// Never ask - user declined installation
    Never,
    /// Shaders have been installed
    Installed,
}

/// State of an integration's install prompt
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "snake_case")]
pub enum InstallPromptState {
    /// Prompt user when appropriate (default)
    #[default]
    Ask,
    /// User said "never ask again"
    Never,
    /// Currently installed
    Installed,
}

impl InstallPromptState {
    /// Display name for UI
    pub fn display_name(&self) -> &'static str {
        match self {
            Self::Ask => "Ask",
            Self::Never => "Never",
            Self::Installed => "Installed",
        }
    }
}

/// Tracks installed and prompted versions for integrations
#[derive(Debug, Clone, Default, Serialize, Deserialize)]
pub struct IntegrationVersions {
    /// Version when shaders were installed
    pub shaders_installed_version: Option<String>,
    /// Version when user was last prompted about shaders
    pub shaders_prompted_version: Option<String>,
    /// Version when shell integration was installed
    pub shell_integration_installed_version: Option<String>,
    /// Version when user was last prompted about shell integration
    pub shell_integration_prompted_version: Option<String>,
}

/// Startup directory mode
///
/// Controls where the terminal starts its working directory.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "snake_case")]
pub enum StartupDirectoryMode {
    /// Start in the user's home directory (default)
    #[default]
    Home,
    /// Remember and restore the last working directory from the previous session
    Previous,
    /// Start in a user-specified custom path
    Custom,
}

impl StartupDirectoryMode {
    /// Display name for UI
    pub fn display_name(&self) -> &'static str {
        match self {
            Self::Home => "Home Directory",
            Self::Previous => "Previous Session",
            Self::Custom => "Custom Directory",
        }
    }

    /// All available modes for UI iteration
    pub fn all() -> &'static [StartupDirectoryMode] {
        &[
            StartupDirectoryMode::Home,
            StartupDirectoryMode::Previous,
            StartupDirectoryMode::Custom,
        ]
    }
}

/// Action to take when the shell process exits
///
/// Controls what happens when a shell session terminates.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "snake_case")]
pub enum ShellExitAction {
    /// Close the tab/pane when shell exits (default)
    #[default]
    Close,
    /// Keep the pane open showing the terminated shell
    Keep,
    /// Immediately restart the shell
    RestartImmediately,
    /// Show a prompt message and wait for Enter before restarting
    RestartWithPrompt,
    /// Restart the shell after a 1 second delay
    RestartAfterDelay,
}

impl ShellExitAction {
    /// Display name for UI
    pub fn display_name(&self) -> &'static str {
        match self {
            Self::Close => "Close tab/pane",
            Self::Keep => "Keep open",
            Self::RestartImmediately => "Restart immediately",
            Self::RestartWithPrompt => "Restart with prompt",
            Self::RestartAfterDelay => "Restart after 1s delay",
        }
    }

    /// All available actions for UI iteration
    pub fn all() -> &'static [ShellExitAction] {
        &[
            ShellExitAction::Close,
            ShellExitAction::Keep,
            ShellExitAction::RestartImmediately,
            ShellExitAction::RestartWithPrompt,
            ShellExitAction::RestartAfterDelay,
        ]
    }

    /// Returns true if this action involves restarting the shell
    pub fn is_restart(&self) -> bool {
        matches!(
            self,
            Self::RestartImmediately | Self::RestartWithPrompt | Self::RestartAfterDelay
        )
    }
}

/// Detected shell type
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "lowercase")]
pub enum ShellType {
    Bash,
    Zsh,
    Fish,
    #[default]
    Unknown,
}

impl ShellType {
    /// Classify a shell path string into a `ShellType`.
    fn from_path(path: &str) -> Self {
        if path.contains("zsh") {
            Self::Zsh
        } else if path.contains("bash") {
            Self::Bash
        } else if path.contains("fish") {
            Self::Fish
        } else {
            Self::Unknown
        }
    }

    /// Detect shell type using multiple strategies.
    ///
    /// 1. `$SHELL` environment variable (works in terminals).
    /// 2. macOS Directory Services (`dscl`) — works for app-bundle launches.
    /// 3. `/etc/passwd` entry for the current user (Linux / older macOS).
    pub fn detect() -> Self {
        // 1. $SHELL env var
        if let Ok(shell) = std::env::var("SHELL") {
            let t = Self::from_path(&shell);
            if t != Self::Unknown {
                return t;
            }
        }

        // 2. macOS: query Directory Services for the login shell
        #[cfg(target_os = "macos")]
        {
            if let Some(t) = Self::detect_via_dscl() {
                return t;
            }
        }

        // 3. Parse /etc/passwd for the current user's shell
        #[cfg(unix)]
        {
            if let Some(t) = Self::detect_from_passwd() {
                return t;
            }
        }

        Self::Unknown
    }

    /// macOS: run `dscl . -read /Users/<user> UserShell` to get the login shell.
    #[cfg(target_os = "macos")]
    fn detect_via_dscl() -> Option<Self> {
        let user = std::env::var("USER")
            .or_else(|_| std::env::var("LOGNAME"))
            .ok()?;
        let output = std::process::Command::new("dscl")
            .args([".", "-read", &format!("/Users/{}", user), "UserShell"])
            .output()
            .ok()?;
        let text = String::from_utf8_lossy(&output.stdout);
        // Output looks like: "UserShell: /bin/zsh"
        let shell_path = text.split_whitespace().last()?;
        let t = Self::from_path(shell_path);
        if t != Self::Unknown { Some(t) } else { None }
    }

    /// Unix: parse `/etc/passwd` for the current user's configured shell.
    #[cfg(unix)]
    fn detect_from_passwd() -> Option<Self> {
        let user = std::env::var("USER")
            .or_else(|_| std::env::var("LOGNAME"))
            .ok()?;
        let contents = std::fs::read_to_string("/etc/passwd").ok()?;
        for line in contents.lines() {
            let parts: Vec<&str> = line.splitn(7, ':').collect();
            if parts.len() == 7 && parts[0] == user {
                let t = Self::from_path(parts[6]);
                if t != Self::Unknown {
                    return Some(t);
                }
            }
        }
        None
    }

    /// Display name for UI
    pub fn display_name(&self) -> &'static str {
        match self {
            Self::Bash => "Bash",
            Self::Zsh => "Zsh",
            Self::Fish => "Fish",
            Self::Unknown => "Unknown",
        }
    }

    /// File extension for integration script
    pub fn extension(&self) -> &'static str {
        match self {
            Self::Bash => "bash",
            Self::Zsh => "zsh",
            Self::Fish => "fish",
            Self::Unknown => "sh",
        }
    }
}

/// Update check frequency
///
/// Controls how often par-term checks GitHub for new releases.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "snake_case")]
pub enum UpdateCheckFrequency {
    /// Never check for updates
    Never,
    /// Check once per hour
    Hourly,
    /// Check once per day (default)
    #[default]
    Daily,
    /// Check once per week
    Weekly,
    /// Check once per month
    Monthly,
}

impl UpdateCheckFrequency {
    /// Get the duration in seconds for this frequency
    pub fn as_seconds(&self) -> Option<u64> {
        match self {
            UpdateCheckFrequency::Never => None,
            UpdateCheckFrequency::Hourly => Some(3600),
            UpdateCheckFrequency::Daily => Some(24 * 60 * 60), // 86400
            UpdateCheckFrequency::Weekly => Some(7 * 24 * 60 * 60), // 604800
            UpdateCheckFrequency::Monthly => Some(30 * 24 * 60 * 60), // 2592000
        }
    }

    /// Display name for UI
    pub fn display_name(&self) -> &'static str {
        match self {
            UpdateCheckFrequency::Never => "Never",
            UpdateCheckFrequency::Hourly => "Hourly",
            UpdateCheckFrequency::Daily => "Daily",
            UpdateCheckFrequency::Weekly => "Weekly",
            UpdateCheckFrequency::Monthly => "Monthly",
        }
    }
}

// ============================================================================
// Session Logging Types
// ============================================================================

/// Log format for session logging
///
/// Controls the format used when automatically logging terminal sessions.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "lowercase")]
pub enum SessionLogFormat {
    /// Plain text - strips escape sequences, captures only printable output
    Plain,
    /// HTML - preserves colors and styling as HTML
    Html,
    /// Asciicast v2 - asciinema-compatible format for replay/sharing
    #[default]
    Asciicast,
}

impl SessionLogFormat {
    /// Display name for UI
    pub fn display_name(&self) -> &'static str {
        match self {
            SessionLogFormat::Plain => "Plain Text",
            SessionLogFormat::Html => "HTML",
            SessionLogFormat::Asciicast => "Asciicast (asciinema)",
        }
    }

    /// All available formats for UI iteration
    pub fn all() -> &'static [SessionLogFormat] {
        &[
            SessionLogFormat::Plain,
            SessionLogFormat::Html,
            SessionLogFormat::Asciicast,
        ]
    }

    /// File extension for this format
    pub fn extension(&self) -> &'static str {
        match self {
            SessionLogFormat::Plain => "txt",
            SessionLogFormat::Html => "html",
            SessionLogFormat::Asciicast => "cast",
        }
    }
}

/// Log level for debug logging to file.
///
/// Controls the verbosity of log output written to the debug log file.
/// Environment variables `RUST_LOG` and `--log-level` CLI flag take precedence.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "lowercase")]
pub enum LogLevel {
    /// No logging (log file not created)
    #[default]
    Off,
    /// Errors only
    Error,
    /// Warnings and errors
    Warn,
    /// Informational messages
    Info,
    /// Debug messages
    Debug,
    /// Most verbose
    Trace,
}

impl LogLevel {
    /// Display name for UI
    pub fn display_name(&self) -> &'static str {
        match self {
            LogLevel::Off => "Off",
            LogLevel::Error => "Error",
            LogLevel::Warn => "Warn",
            LogLevel::Info => "Info",
            LogLevel::Debug => "Debug",
            LogLevel::Trace => "Trace",
        }
    }

    /// All available levels for UI iteration
    pub fn all() -> &'static [LogLevel] {
        &[
            LogLevel::Off,
            LogLevel::Error,
            LogLevel::Warn,
            LogLevel::Info,
            LogLevel::Debug,
            LogLevel::Trace,
        ]
    }

    /// Convert to `log::LevelFilter`
    pub fn to_level_filter(self) -> log::LevelFilter {
        match self {
            LogLevel::Off => log::LevelFilter::Off,
            LogLevel::Error => log::LevelFilter::Error,
            LogLevel::Warn => log::LevelFilter::Warn,
            LogLevel::Info => log::LevelFilter::Info,
            LogLevel::Debug => log::LevelFilter::Debug,
            LogLevel::Trace => log::LevelFilter::Trace,
        }
    }
}

/// Editor selection mode for semantic history
///
/// Controls how the editor is selected when opening files via semantic history.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "snake_case")]
pub enum SemanticHistoryEditorMode {
    /// Use custom editor command from `semantic_history_editor` setting
    Custom,
    /// Use $EDITOR or $VISUAL environment variable
    #[default]
    EnvironmentVariable,
    /// Use system default application for each file type
    SystemDefault,
}

impl SemanticHistoryEditorMode {
    /// Display name for UI
    pub fn display_name(&self) -> &'static str {
        match self {
            SemanticHistoryEditorMode::Custom => "Custom Editor",
            SemanticHistoryEditorMode::EnvironmentVariable => "Environment Variable ($EDITOR)",
            SemanticHistoryEditorMode::SystemDefault => "System Default",
        }
    }

    /// All available modes for UI iteration
    pub fn all() -> &'static [SemanticHistoryEditorMode] {
        &[
            SemanticHistoryEditorMode::Custom,
            SemanticHistoryEditorMode::EnvironmentVariable,
            SemanticHistoryEditorMode::SystemDefault,
        ]
    }
}

/// Style for link highlight underlines.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "snake_case")]
pub enum LinkUnderlineStyle {
    /// Solid continuous underline
    Solid,
    /// Dotted/stipple underline (alternating pixels)
    #[default]
    Stipple,
}

impl LinkUnderlineStyle {
    /// Display name for UI
    pub fn display_name(&self) -> &'static str {
        match self {
            LinkUnderlineStyle::Solid => "Solid",
            LinkUnderlineStyle::Stipple => "Stipple",
        }
    }

    /// All available styles for UI iteration
    pub fn all() -> &'static [LinkUnderlineStyle] {
        &[LinkUnderlineStyle::Solid, LinkUnderlineStyle::Stipple]
    }
}

// ============================================================================
// Per-Shader Configuration Types
// ============================================================================

/// Metadata embedded in shader files via YAML block comments.
///
/// Parsed from `/*! par-term shader metadata ... */` blocks at the top of shader files.
#[derive(Debug, Clone, Default, Serialize, Deserialize)]
pub struct ShaderMetadata {
    /// Human-readable name for the shader (e.g., "CRT Effect")
    pub name: Option<String>,
    /// Author of the shader
    pub author: Option<String>,
    /// Description of what the shader does
    pub description: Option<String>,
    /// Version string (e.g., "1.0.0")
    pub version: Option<String>,
    /// Default configuration values for this shader
    #[serde(default)]
    pub defaults: ShaderConfig,
}

/// Per-shader configuration settings.
///
/// Used both for embedded defaults in shader files and for user overrides in config.yaml.
/// All fields are optional to allow partial overrides.
#[derive(Debug, Clone, Default, PartialEq, Serialize, Deserialize)]
pub struct ShaderConfig {
    /// Animation speed multiplier (1.0 = normal speed)
    pub animation_speed: Option<f32>,
    /// Brightness multiplier (0.05-1.0)
    pub brightness: Option<f32>,
    /// Text opacity when using this shader (0.0-1.0)
    pub text_opacity: Option<f32>,
    /// When true, shader receives full terminal content for manipulation
    pub full_content: Option<bool>,
    /// Path to texture for iChannel0
    pub channel0: Option<String>,
    /// Path to texture for iChannel1
    pub channel1: Option<String>,
    /// Path to texture for iChannel2
    pub channel2: Option<String>,
    /// Path to texture for iChannel3
    pub channel3: Option<String>,
    /// Path prefix for cubemap faces
    pub cubemap: Option<String>,
    /// Whether cubemap sampling is enabled
    pub cubemap_enabled: Option<bool>,
    /// Use the app's background image as iChannel0 instead of a separate texture
    pub use_background_as_channel0: Option<bool>,
}

/// Cursor shader specific configuration.
///
/// Extends base ShaderConfig with cursor-specific settings.
#[derive(Debug, Clone, Default, Serialize, Deserialize, PartialEq)]
pub struct CursorShaderConfig {
    /// Base shader configuration
    #[serde(flatten)]
    pub base: ShaderConfig,
    /// Hide the default cursor when this shader is enabled
    pub hides_cursor: Option<bool>,
    /// Disable cursor shader while in alt screen (vim, less, htop)
    pub disable_in_alt_screen: Option<bool>,
    /// Cursor glow radius in pixels
    pub glow_radius: Option<f32>,
    /// Cursor glow intensity (0.0-1.0)
    pub glow_intensity: Option<f32>,
    /// Duration of cursor trail effect in seconds
    pub trail_duration: Option<f32>,
    /// Cursor color for shader effects [R, G, B] (0-255)
    pub cursor_color: Option<[u8; 3]>,
}

/// Metadata embedded in cursor shader files via YAML block comments.
///
/// Parsed from `/*! par-term shader metadata ... */` blocks at the top of cursor shader files.
/// Similar to `ShaderMetadata` but with cursor-specific defaults.
#[derive(Debug, Clone, Default, Serialize, Deserialize)]
pub struct CursorShaderMetadata {
    /// Human-readable name for the shader (e.g., "Cursor Glow Effect")
    pub name: Option<String>,
    /// Author of the shader
    pub author: Option<String>,
    /// Description of what the shader does
    pub description: Option<String>,
    /// Version string (e.g., "1.0.0")
    pub version: Option<String>,
    /// Default configuration values for this cursor shader
    #[serde(default)]
    pub defaults: CursorShaderConfig,
}

/// Fully resolved shader configuration with all values filled in.
///
/// Created by merging user overrides, shader metadata defaults, and global defaults.
#[derive(Debug, Clone)]
#[allow(dead_code)]
pub struct ResolvedShaderConfig {
    /// Animation speed multiplier
    pub animation_speed: f32,
    /// Brightness multiplier
    pub brightness: f32,
    /// Text opacity
    pub text_opacity: f32,
    /// Full content mode enabled
    pub full_content: bool,
    /// Resolved path to iChannel0 texture
    pub channel0: Option<PathBuf>,
    /// Resolved path to iChannel1 texture
    pub channel1: Option<PathBuf>,
    /// Resolved path to iChannel2 texture
    pub channel2: Option<PathBuf>,
    /// Resolved path to iChannel3 texture
    pub channel3: Option<PathBuf>,
    /// Resolved cubemap path prefix
    pub cubemap: Option<PathBuf>,
    /// Cubemap sampling enabled
    pub cubemap_enabled: bool,
    /// Use the app's background image as iChannel0
    pub use_background_as_channel0: bool,
}

impl Default for ResolvedShaderConfig {
    fn default() -> Self {
        Self {
            animation_speed: 1.0,
            brightness: 1.0,
            text_opacity: 1.0,
            full_content: false,
            channel0: None,
            channel1: None,
            channel2: None,
            channel3: None,
            cubemap: None,
            cubemap_enabled: true,
            use_background_as_channel0: false,
        }
    }
}

/// Fully resolved cursor shader configuration with all values filled in.
#[derive(Debug, Clone)]
#[allow(dead_code)]
pub struct ResolvedCursorShaderConfig {
    /// Base resolved shader config
    pub base: ResolvedShaderConfig,
    /// Hide the default cursor when this shader is enabled
    pub hides_cursor: bool,
    /// Disable cursor shader while in alt screen (vim, less, htop)
    pub disable_in_alt_screen: bool,
    /// Cursor glow radius in pixels
    pub glow_radius: f32,
    /// Cursor glow intensity (0.0-1.0)
    pub glow_intensity: f32,
    /// Duration of cursor trail effect in seconds
    pub trail_duration: f32,
    /// Cursor color for shader effects [R, G, B] (0-255)
    pub cursor_color: [u8; 3],
}

impl Default for ResolvedCursorShaderConfig {
    fn default() -> Self {
        Self {
            base: ResolvedShaderConfig::default(),
            hides_cursor: false,
            disable_in_alt_screen: true,
            glow_radius: 80.0,
            glow_intensity: 0.3,
            trail_duration: 0.5,
            cursor_color: [255, 255, 255],
        }
    }
}

// ============================================================================
// Progress Bar Types
// ============================================================================

/// Progress bar visual style
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "lowercase")]
pub enum ProgressBarStyle {
    /// Thin bar line (default)
    #[default]
    Bar,
    /// Bar with percentage text
    BarWithText,
}

impl ProgressBarStyle {
    /// Display name for UI
    pub fn display_name(&self) -> &'static str {
        match self {
            ProgressBarStyle::Bar => "Bar",
            ProgressBarStyle::BarWithText => "Bar with Text",
        }
    }

    /// All available styles for UI iteration
    pub fn all() -> &'static [ProgressBarStyle] {
        &[ProgressBarStyle::Bar, ProgressBarStyle::BarWithText]
    }
}

/// Progress bar position on screen
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "lowercase")]
pub enum ProgressBarPosition {
    /// Top of the terminal window (default)
    #[default]
    Top,
    /// Bottom of the terminal window
    Bottom,
}

impl ProgressBarPosition {
    /// Display name for UI
    pub fn display_name(&self) -> &'static str {
        match self {
            ProgressBarPosition::Bottom => "Bottom",
            ProgressBarPosition::Top => "Top",
        }
    }

    /// All available positions for UI iteration
    pub fn all() -> &'static [ProgressBarPosition] {
        &[ProgressBarPosition::Top, ProgressBarPosition::Bottom]
    }
}

// ============================================================================
// Smart Selection Types
// ============================================================================

/// Precision level for smart selection rules.
///
/// Higher precision rules are checked first and match more specific patterns.
/// Based on iTerm2's smart selection precision levels.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "snake_case")]
pub enum SmartSelectionPrecision {
    /// Very low precision (0.00001) - matches almost anything
    VeryLow,
    /// Low precision (0.001) - broad patterns
    Low,
    /// Normal precision (1.0) - standard patterns
    #[default]
    Normal,
    /// High precision (1000.0) - specific patterns
    High,
    /// Very high precision (1000000.0) - most specific patterns (checked first)
    VeryHigh,
}

impl SmartSelectionPrecision {
    /// Get the numeric precision value for sorting
    pub fn value(&self) -> f64 {
        match self {
            SmartSelectionPrecision::VeryLow => 0.00001,
            SmartSelectionPrecision::Low => 0.001,
            SmartSelectionPrecision::Normal => 1.0,
            SmartSelectionPrecision::High => 1000.0,
            SmartSelectionPrecision::VeryHigh => 1_000_000.0,
        }
    }

    /// Display name for UI
    pub fn display_name(&self) -> &'static str {
        match self {
            SmartSelectionPrecision::VeryLow => "Very Low",
            SmartSelectionPrecision::Low => "Low",
            SmartSelectionPrecision::Normal => "Normal",
            SmartSelectionPrecision::High => "High",
            SmartSelectionPrecision::VeryHigh => "Very High",
        }
    }
}

/// Position of pane title bars
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "snake_case")]
pub enum PaneTitlePosition {
    /// Title bar at the top of the pane (default)
    #[default]
    Top,
    /// Title bar at the bottom of the pane
    Bottom,
}

impl PaneTitlePosition {
    /// All available positions for UI dropdowns
    pub const ALL: &'static [PaneTitlePosition] =
        &[PaneTitlePosition::Top, PaneTitlePosition::Bottom];

    /// Display name for UI
    pub fn display_name(&self) -> &'static str {
        match self {
            PaneTitlePosition::Top => "Top",
            PaneTitlePosition::Bottom => "Bottom",
        }
    }
}

/// Style of dividers between panes
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "snake_case")]
pub enum DividerStyle {
    /// Solid line (default)
    #[default]
    Solid,
    /// Double line effect (two thin lines with gap)
    Double,
    /// Dashed line effect
    Dashed,
    /// Shadow effect (gradient fade)
    Shadow,
}

impl DividerStyle {
    /// All available styles for UI dropdowns
    pub const ALL: &'static [DividerStyle] = &[
        DividerStyle::Solid,
        DividerStyle::Double,
        DividerStyle::Dashed,
        DividerStyle::Shadow,
    ];

    /// Display name for UI
    pub fn display_name(&self) -> &'static str {
        match self {
            DividerStyle::Solid => "Solid",
            DividerStyle::Double => "Double",
            DividerStyle::Dashed => "Dashed",
            DividerStyle::Shadow => "Shadow",
        }
    }
}

/// Terminal events that can trigger alert sounds
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum AlertEvent {
    /// Bell character received (BEL / 0x07)
    Bell,
    /// Command completed (requires shell integration)
    CommandComplete,
    /// A new tab was created
    NewTab,
    /// A tab was closed
    TabClose,
}

impl AlertEvent {
    /// Display name for UI
    pub fn display_name(&self) -> &'static str {
        match self {
            AlertEvent::Bell => "Bell",
            AlertEvent::CommandComplete => "Command Complete",
            AlertEvent::NewTab => "New Tab",
            AlertEvent::TabClose => "Tab Close",
        }
    }

    /// All available events for UI iteration
    pub fn all() -> &'static [AlertEvent] {
        &[
            AlertEvent::Bell,
            AlertEvent::CommandComplete,
            AlertEvent::NewTab,
            AlertEvent::TabClose,
        ]
    }
}

/// Configuration for an alert sound tied to a specific event
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AlertSoundConfig {
    /// Whether this alert sound is enabled
    #[serde(default = "crate::defaults::bool_true")]
    pub enabled: bool,
    /// Volume 0-100 (0 effectively disables)
    #[serde(default = "crate::defaults::bell_sound")]
    pub volume: u8,
    /// Optional path to a custom sound file (WAV/OGG/FLAC).
    /// If None, uses built-in tone with the configured frequency.
    #[serde(default)]
    pub sound_file: Option<String>,
    /// Frequency in Hz for the built-in tone (used when sound_file is None)
    #[serde(default = "default_alert_frequency")]
    pub frequency: f32,
    /// Duration of the built-in tone in milliseconds
    #[serde(default = "default_alert_duration_ms")]
    pub duration_ms: u64,
}

fn default_alert_frequency() -> f32 {
    800.0
}

fn default_alert_duration_ms() -> u64 {
    100
}

impl Default for AlertSoundConfig {
    fn default() -> Self {
        Self {
            enabled: true,
            volume: 50,
            sound_file: None,
            frequency: 800.0,
            duration_ms: 100,
        }
    }
}

/// A smart selection rule for pattern-based text selection.
///
/// When double-clicking, rules are evaluated by precision (highest first).
/// If a pattern matches at the cursor position, that text is selected.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SmartSelectionRule {
    /// Human-readable name for this rule (e.g., "HTTP URL", "Email address")
    pub name: String,
    /// Regular expression pattern to match
    pub regex: String,
    /// Precision level - higher precision rules are checked first
    #[serde(default)]
    pub precision: SmartSelectionPrecision,
    /// Whether this rule is enabled
    #[serde(default = "default_enabled")]
    pub enabled: bool,
}

fn default_enabled() -> bool {
    true
}

impl SmartSelectionRule {
    /// Create a new smart selection rule
    pub fn new(
        name: impl Into<String>,
        regex: impl Into<String>,
        precision: SmartSelectionPrecision,
    ) -> Self {
        Self {
            name: name.into(),
            regex: regex.into(),
            precision,
            enabled: true,
        }
    }
}

/// Get the default smart selection rules (based on iTerm2's defaults)
pub fn default_smart_selection_rules() -> Vec<SmartSelectionRule> {
    vec![
        // Very High precision - most specific, checked first
        SmartSelectionRule::new(
            "HTTP URL",
            r"https?://[^\s<>\[\]{}|\\^`\x00-\x1f]+",
            SmartSelectionPrecision::VeryHigh,
        ),
        SmartSelectionRule::new(
            "SSH URL",
            r"\bssh://([a-zA-Z0-9_]+@)?([a-zA-Z0-9\-]+\.)*[a-zA-Z0-9\-]+(/[^\s]*)?",
            SmartSelectionPrecision::VeryHigh,
        ),
        SmartSelectionRule::new(
            "Git URL",
            r"\bgit://([a-zA-Z0-9_]+@)?([a-zA-Z0-9\-]+\.)*[a-zA-Z0-9\-]+(/[^\s]*)?",
            SmartSelectionPrecision::VeryHigh,
        ),
        SmartSelectionRule::new(
            "File URL",
            r"file://[^\s]+",
            SmartSelectionPrecision::VeryHigh,
        ),
        // High precision
        SmartSelectionRule::new(
            "Email address",
            r"\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,}\b",
            SmartSelectionPrecision::High,
        ),
        SmartSelectionRule::new(
            "IPv4 address",
            r"\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b",
            SmartSelectionPrecision::High,
        ),
        // Normal precision
        SmartSelectionRule::new(
            "File path",
            r"~?/?(?:[a-zA-Z0-9._-]+/)+[a-zA-Z0-9._-]+/?",
            SmartSelectionPrecision::Normal,
        ),
        SmartSelectionRule::new(
            "Java/Python import",
            // Require at least 2 dots to avoid matching simple filenames like "file.txt"
            r"(?:[a-zA-Z_][a-zA-Z0-9_]*\.){2,}[a-zA-Z_][a-zA-Z0-9_]*",
            SmartSelectionPrecision::Normal,
        ),
        SmartSelectionRule::new(
            "C++ namespace",
            r"(?:[a-zA-Z_][a-zA-Z0-9_]*::)+[a-zA-Z_][a-zA-Z0-9_]*",
            SmartSelectionPrecision::Normal,
        ),
        SmartSelectionRule::new(
            "Quoted string",
            r#""(?:[^"\\]|\\.)*""#,
            SmartSelectionPrecision::Normal,
        ),
        SmartSelectionRule::new(
            "UUID",
            r"\b[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}\b",
            SmartSelectionPrecision::Normal,
        ),
        // Note: No "whitespace-bounded" catch-all pattern here - that would defeat
        // the purpose of configurable word_characters. If no smart pattern matches,
        // selection falls back to word boundary detection using word_characters.
    ]
}

// ============================================================================
// Rendering Types
// ============================================================================

/// Per-pane background image configuration (runtime state)
#[derive(Debug, Clone, Default)]
pub struct PaneBackground {
    /// Path to the background image (None = use global background)
    pub image_path: Option<String>,
    /// Display mode (fit/fill/stretch/tile/center)
    pub mode: BackgroundImageMode,
    /// Opacity (0.0-1.0)
    pub opacity: f32,
    /// Darken amount (0.0 = no darkening, 1.0 = fully black)
    pub darken: f32,
}

impl PaneBackground {
    /// Create a new PaneBackground with default settings
    pub fn new() -> Self {
        Self {
            image_path: None,
            mode: BackgroundImageMode::default(),
            opacity: 1.0,
            darken: 0.0,
        }
    }

    /// Returns true if this pane has a custom background image set
    pub fn has_image(&self) -> bool {
        self.image_path.is_some()
    }
}

/// A divider rectangle between panes
#[derive(Debug, Clone, Copy)]
pub struct DividerRect {
    /// X position in pixels
    pub x: f32,
    /// Y position in pixels
    pub y: f32,
    /// Width in pixels
    pub width: f32,
    /// Height in pixels
    pub height: f32,
    /// Whether this is a horizontal divider (vertical line)
    pub is_horizontal: bool,
}

impl DividerRect {
    /// Create a new divider rect
    pub fn new(x: f32, y: f32, width: f32, height: f32, is_horizontal: bool) -> Self {
        Self {
            x,
            y,
            width,
            height,
            is_horizontal,
        }
    }

    /// Check if a point is inside the divider (with optional padding for easier grabbing)
    pub fn contains(&self, px: f32, py: f32, padding: f32) -> bool {
        px >= self.x - padding
            && px < self.x + self.width + padding
            && py >= self.y - padding
            && py < self.y + self.height + padding
    }
}

/// Visible command separator mark: (row, col_offset, optional_color)
pub type SeparatorMark = (usize, Option<i32>, Option<(u8, u8, u8)>);

// ============================================================================
// Shared ID Types
// ============================================================================

/// Unique identifier for a pane
pub type PaneId = u64;

/// Unique identifier for a tab
pub type TabId = u64;