// Adapted from claudegram's message-sender.ts — send with retry, chunking, fallback
import { logger } from '../utils/logger.js';

const MAX_MSG_LENGTH = 4000;

export function splitMessage(text) {
  if (text.length <= MAX_MSG_LENGTH) return [text];
  const chunks = [];
  let remaining = text;
  while (remaining.length > 0) {
    chunks.push(remaining.slice(0, MAX_MSG_LENGTH));
    remaining = remaining.slice(MAX_MSG_LENGTH);
  }
  return chunks;
}

export function escapeMarkdown(text) {
  if (!text) return '';
  return text
    .replace(/_/g, '\\_')
    .replace(/\*/g, '\\*')
    .replace(/\[/g, '\\[')
    .replace(/`/g, '\\`');
}

export async function sendFormatted(ctx, text) {
  if (!text) return;

  try {
    // Try Markdown first
    const chunks = splitMessage(text);
    for (const chunk of chunks) {
      await ctx.reply(chunk, { parse_mode: 'Markdown' });
    }
  } catch {
    // Fallback to plain text
    logger.warn('Markdown send failed, falling back to plain text');
    const chunks = splitMessage(text);
    for (const chunk of chunks) {
      await ctx.reply(chunk, { parse_mode: undefined });
    }
  }
}

export async function sendLongMessage(ctx, text) {
  if (!text) return;
  return sendFormatted(ctx, text);
}