/**
 * KHAELOR
 * File: prototypes/tui-spike/shared/ansi.ts
 * Description: ANSI helpers shared by both spike candidates — strip, width, wrap, truncate.
 *
 * Author: Simon-Pierre Boucher
 * Contact: contact@spboucher.ai
 */

export const CSI = "\x1b[";
export const SYNC_ON = "\x1b[?2026h";
export const SYNC_OFF = "\x1b[?2026l";
export const HIDE_CURSOR = "\x1b[?25l";
export const SHOW_CURSOR = "\x1b[?25h";

const ANSI_RE = /\x1b\[[0-9;?]*[A-Za-z]|\x1b\][^\x07\x1b]*(?:\x07|\x1b\\)|\x1b./g;

export function stripAnsi(s: string): string {
  return s.replace(ANSI_RE, "");
}

/** Visible width in columns. Demo content is width-1 code points only, so code-point count is exact here. */
export function visibleWidth(s: string): number {
  return [...stripAnsi(s)].length;
}

export function truncate(s: string, w: number): string {
  const cp = [...s];
  return cp.length <= w ? s : cp.slice(0, w).join("");
}

/** Greedy word wrap; hard-splits words longer than the width. Splits embedded newlines first. */
export function wrapText(text: string, w: number): string[] {
  const out: string[] = [];
  for (const raw of text.split("\n")) {
    if ([...raw].length <= w) {
      out.push(raw);
      continue;
    }
    let line = "";
    for (const word of raw.split(" ")) {
      const candidate = line === "" ? word : line + " " + word;
      if ([...candidate].length <= w) {
        line = candidate;
      } else {
        if (line !== "") out.push(line);
        let rest = word;
        while ([...rest].length > w) {
          out.push([...rest].slice(0, w).join(""));
          rest = [...rest].slice(w).join("");
        }
        line = rest;
      }
    }
    out.push(line);
  }
  return out;
}

export function countMatches(s: string, re: RegExp): number {
  let n = 0;
  re.lastIndex = 0;
  while (re.exec(s) !== null) n++;
  return n;
}