/**
 * Ring buffer for Emacs-style kill/yank operations.
 *
 * Tracks killed (deleted) text entries. Consecutive kills can accumulate
 * into a single entry. Supports yank (paste most recent) and yank-pop
 * (cycle through older entries).
 */
export class KillRing {
  ring = [];
  /**
   * Add text to the kill ring.
   *
   * @param text - The killed text to add
   * @param opts - Push options
   * @param opts.prepend - If accumulating, prepend (backward deletion) or append (forward deletion)
   * @param opts.accumulate - Merge with the most recent entry instead of creating a new one
   */
  push(text, opts) {
    if (!text) return;
    if (opts.accumulate && this.ring.length > 0) {
      const last = this.ring.pop();
      this.ring.push(opts.prepend ? text + last : last + text);
    } else {
      this.ring.push(text);
    }
  }
  /** Get most recent entry without modifying the ring. */
  peek() {
    return this.ring.length > 0 ? this.ring[this.ring.length - 1] : undefined;
  }
  /** Move last entry to front (for yank-pop cycling). */
  rotate() {
    if (this.ring.length > 1) {
      const last = this.ring.pop();
      this.ring.unshift(last);
    }
  }
  get length() {
    return this.ring.length;
  }
}
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