/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
const SPECIAL_KEYS = {
    up: '\x1b[A',
    down: '\x1b[B',
    right: '\x1b[C',
    left: '\x1b[D',
    escape: '\x1b',
    tab: '\t',
    backspace: '\x7f',
    delete: '\x1b[3~',
    home: '\x1b[H',
    end: '\x1b[F',
    pageup: '\x1b[5~',
    pagedown: '\x1b[6~',
    enter: '\r',
};
/**
 * Translates a Key object into its corresponding ANSI escape sequence.
 * This is useful for sending control characters to a pseudo-terminal.
 *
 * @param key The Key object to translate.
 * @returns The ANSI escape sequence as a string, or null if no mapping exists.
 */
export function keyToAnsi(key) {
    if (key.ctrl) {
        // Ctrl + letter (A-Z maps to 1-26, e.g., Ctrl+C is \x03)
        if (key.name >= 'a' && key.name <= 'z') {
            return String.fromCharCode(key.name.charCodeAt(0) - 'a'.charCodeAt(0) + 1);
        }
    }
    // Arrow keys and other special keys
    if (key.name in SPECIAL_KEYS) {
        return SPECIAL_KEYS[key.name];
    }
    // If it's a simple character, return it.
    if (!key.ctrl && !key.cmd && key.sequence) {
        return key.sequence;
    }
    return null;
}
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