// Mailbox list for neomutt, regenerated on every sync: one mailbox per chat, ordered
// like WhatsApp (pinned, then by last activity; archived at the end).
// The neomutt account includes it with `source`.

import fs from 'node:fs';
import path from 'node:path';
import { CACHE_DIR, ensureMaildir } from './store.js';

export function mailboxesPath(account) {
    return path.join(CACHE_DIR, account, 'mailboxes.muttrc');
}

// Names come from other people (group names): no quotes, backticks or `$`,
// which neomutt would interpret on `source`.
const safe = (s) => String(s ?? '').replace(/[\x00-\x1f'"`$\\]/g, '').trim() || '?';
const regexEscape = (s) => s.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');

export function writeMailboxes(account, root, state) {
    const chats = Object.values(state.chats).filter((c) => c.dir);
    const byActivity = (a, b) => (b.timestamp ?? 0) - (a.timestamp ?? 0);
    const active = chats.filter((c) => !c.archived).sort((a, b) => (Number(Boolean(b.pinned)) - Number(Boolean(a.pinned))) || byActivity(a, b));
    const archived = chats.filter((c) => c.archived).sort(byActivity);

    const lines = ['# Generated by `wamail sync` — do not edit by hand.'];
    if (active[0]) lines.push(`set spoolfile = '${path.join(root, active[0].dir)}'`);
    if (state.me?.id) lines.push(`alternates '^${regexEscape(state.me.id)}$'`);
    for (const c of active) {
        const icon = c.isGroup ? '' : '';
        lines.push(`named-mailboxes '${icon} ${c.pinned ? ' ' : ''}${safe(c.name)}' '${path.join(root, c.dir)}'`);
    }
    for (const c of archived) lines.push(`named-mailboxes ' ${safe(c.name)}' '${path.join(root, c.dir)}'`);
    ensureMaildir(path.join(root, 'Drafts'));   // neomutt rechaza buzones inexistentes
    lines.push(`named-mailboxes ' Drafts' '${path.join(root, 'Drafts')}'`);

    const file = mailboxesPath(account);
    const text = `${lines.join('\n')}\n`;
    let current = null;
    try {
        current = fs.readFileSync(file, 'utf8');
    } catch { /* primera vez */ }
    if (current === text) return file;
    fs.mkdirSync(path.dirname(file), { recursive: true });
    fs.writeFileSync(`${file}.tmp`, text);
    fs.renameSync(`${file}.tmp`, file);
    return file;
}