zesdex/src/app/mode/settings.rs

//! Settings-mode helper logic for the TUI settings overlay.
//!
//! Flow: exposes small mutation functions (currently just cycling the
//! internet access mode) invoked by keybindings while the settings overlay
//! is active.

use crate::model::settings::{Settings, InternetMode};

/// Advance the internet access mode to the next value in the cycle.
///
/// Flow: Off -> ReadOnly -> Full -> Off, wrapping around.
///
/// Why: used by a settings-toggle keybinding to step through modes
/// without needing a dropdown/menu.
///
/// Return: nothing; mutates `settings.internet_mode` in place.
pub fn cycle_internet_mode(settings: &mut Settings) {
    settings.internet_mode = match settings.internet_mode {
        InternetMode::Off => InternetMode::ReadOnly,
        InternetMode::ReadOnly => InternetMode::Full,
        InternetMode::Full => InternetMode::Off,
    };
}