/**
 * Shared transcript rendering for the two close paths
 * (handlers/buttons.js runFinalClose and handlers/commands/close.js postTranscript).
 * Pure formatting only — each caller owns its own posting / DB / email side effects.
 */
const { CONFIG } = require('../config');

/** Render the last 100 messages of a channel as a plaintext transcript. */
async function buildTranscriptText(channel, ticket) {
  const messages = await channel.messages.fetch({ limit: 100 });
  return `TRANSCRIPT: ${ticket.subject}\nUser: ${ticket.senderEmail}\n---\n` +
    messages
      .reverse()
      .map(m => `[${m.createdAt.toLocaleString()}] ${m.author.tag}: ${m.cleanContent}`)
      .join('\n');
}

/** Format a date for the transcript header (US locale, 12h, with time zone). */
function formatDateForTranscript(d) {
  return new Date(d).toLocaleString('en-US', {
    month: '2-digit', day: '2-digit', year: 'numeric',
    hour: '2-digit', minute: '2-digit', second: '2-digit',
    hour12: true, timeZoneName: 'short'
  });
}

/** Build the transcript-channel message body from DISCORD_TRANSCRIPT_MESSAGE. */
function renderTranscriptHeader(channelName, senderEmail, openedStr, closedStr) {
  return CONFIG.DISCORD_TRANSCRIPT_MESSAGE
    .replace(/\{channel_name\}/g, channelName)
    .replace(/\{email\}/g, senderEmail || '')
    .replace(/\{date_opened\}/g, openedStr)
    .replace(/\{date_closed\}/g, closedStr)
    + `\n\nDate Opened: ${openedStr}\nDate Closed: ${closedStr}`;
}

module.exports = { buildTranscriptText, formatDateForTranscript, renderTranscriptHeader };