// SvxPortal — web front-end for SvxReflector
// Copyright (C) 2026 SA7AUX (Björn)
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify it under
// the terms of the GNU Affero General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option) any
// later version. See the LICENSE file for details.

// fmt.js — shared formatting helpers for every web (dmr-web, svx-web, svxlink-web).
// Canonical copy: <dmr-portal>/lib/fmt.js; other repos carry a COPY.
// Every function here replaced an identical local copy; outputs are unchanged.
(function () {
  'use strict';

  // HTML-escape for innerHTML/attribute use.
  function escHtml(s) {
    return String(s ?? '').replace(/[&<>"']/g, c => ({'&':'&amp;','<':'&lt;','>':'&gt;','"':'&quot;',"'":'&#39;'}[c]));
  }
  // Two-digit zero pad (clock fields).
  function fmt2(n) { return String(n).padStart(2, '0'); }

  // Age in seconds → "12s" / "5m" / "3h" / "2d"; "—" when unknown.
  function fmtAge(s) {
    if (s == null || s < 0) return '—';
    if (s < 60)    return s + 's';
    if (s < 3600)  return Math.floor(s / 60) + 'm';
    if (s < 86400) return Math.floor(s / 3600) + 'h';
    return Math.floor(s / 86400) + 'd';
  }
  // Duration in seconds → "42s" / "3m 5s" / "1h 07m".
  function fmtDur(s) {
    s = Number(s) || 0;
    if (s < 60)    return s + 's';
    const m = Math.floor(s / 60), r = s % 60;
    if (s < 3600)  return m + 'm ' + r + 's';
    const h = Math.floor(s / 3600), mm = Math.floor((s % 3600) / 60);
    return h + 'h ' + mm + 'm';
  }
  // Unix seconds → local date/time string; "—" when missing.
  function fmtTs(ts) {
    if (!ts) return '—';
    try { return new Date(ts * 1000).toLocaleString(); } catch (_) { return '—'; }
  }

  // Callsigns: "SA7AUX-R" / "SA7AUX (x)" → "SA7AUX"; natural sort by prefix,
  // number, suffix so SM7A < SM7B < SM70A.
  function baseCallsign(cs) {
    return String(cs || '').split(/[-(]/)[0].trim();
  }
  function splitForSort(cs) {
    const b = baseCallsign(cs).toUpperCase();
    const m = b.match(/^([A-Z]+)(\d+)([A-Z0-9]*)$/);
    if (!m) return { pre: b, num: Number.POSITIVE_INFINITY, post: '' };
    return { pre: m[1], num: Number(m[2]), post: (m[3] || '') };
  }
  function callsignCompare(a, b) {
    const A = splitForSort(a);
    const B = splitForSort(b);
    if (A.pre !== B.pre) return A.pre < B.pre ? -1 : 1;
    if (A.num !== B.num) return A.num - B.num;
    if (A.post !== B.post) return A.post < B.post ? -1 : 1;
    const ba = baseCallsign(a).toUpperCase();
    const bb = baseCallsign(b).toUpperCase();
    if (ba !== bb) return ba < bb ? -1 : 1;
    const fa = String(a).toUpperCase();
    const fb = String(b).toUpperCase();
    if (fa !== fb) return fa < fb ? -1 : 1;
    return 0;
  }

  // Frequencies: "145,600 MHz" → 145.6; fmtFreq → "145.60000" (5 decimals).
  function parseMHz(v) {
    if (v == null) return NaN;
    if (typeof v === 'number') return v;
    const s = String(v).replace(',', '.').trim();
    const m = s.match(/(\d+(?:\.\d+)?)/);
    return m ? Number(m[1]) : NaN;
  }
  function fmtFreq(v) {
    if (v == null) return '';
    if (typeof v === 'number') {
      if (!Number.isFinite(v)) return '';
      return v.toFixed(5);
    }
    const s = String(v).trim();
    if (!s) return '';
    const mhz = parseMHz(s);
    if (Number.isFinite(mhz) && mhz > 0) {
      return mhz.toFixed(5);
    }
    return s;
  }

  window.escHtml = escHtml;
  window.fmt2 = fmt2;
  window.fmtAge = fmtAge;
  window.fmtDur = fmtDur;
  window.fmtTs = fmtTs;
  window.baseCallsign = baseCallsign;
  window.callsignCompare = callsignCompare;
  window.parseMHz = parseMHz;
  window.fmtFreq = fmtFreq;
})();