(function(){
"use strict";
var HOLIDAYS = [{"d": "2026-01-01", "n": "元旦", "w": "Thu"}, {"d": "2026-02-17", "n": "農曆年初一", "w": "Tue"}, {"d": "2026-02-18", "n": "農曆年初二", "w": "Wed"}, {"d": "2026-02-19", "n": "農曆年初三", "w": "Thu"}, {"d": "2026-04-03", "n": "清明節", "w": "Fri"}, {"d": "2026-04-04", "n": "耶穌受難節", "w": "Sat"}, {"d": "2026-04-06", "n": "復活節星期一", "w": "Mon"}, {"d": "2026-05-01", "n": "勞動節", "w": "Fri"}, {"d": "2026-05-25", "n": "佛誕", "w": "Mon"}, {"d": "2026-06-19", "n": "端午節", "w": "Fri"}, {"d": "2026-07-01", "n": "香港特別行政區成立紀念日", "w": "Wed"}, {"d": "2026-09-26", "n": "中秋節翌日", "w": "Sat"}, {"d": "2026-10-01", "n": "國慶日", "w": "Thu"}, {"d": "2026-10-19", "n": "重陽節", "w": "Mon"}, {"d": "2026-12-25", "n": "聖誕節", "w": "Fri"}, {"d": "2026-12-26", "n": "聖誕節後第一個周日", "w": "Sat"}, {"d": "2027-01-01", "n": "元旦", "w": "Fri"}, {"d": "2027-02-06", "n": "農曆年初一", "w": "Sat"}, {"d": "2027-02-08", "n": "農曆年初三", "w": "Mon"}, {"d": "2027-03-26", "n": "耶穌受難節", "w": "Fri"}, {"d": "2027-03-27", "n": "耶穌受難節翌日", "w": "Sat"}, {"d": "2027-03-29", "n": "復活節星期一", "w": "Mon"}, {"d": "2027-04-05", "n": "清明節", "w": "Mon"}, {"d": "2027-05-01", "n": "勞動節", "w": "Sat"}, {"d": "2027-05-13", "n": "佛誕", "w": "Thu"}, {"d": "2027-06-09", "n": "端午節", "w": "Wed"}, {"d": "2027-07-01", "n": "香港特別行政區成立紀念日", "w": "Thu"}, {"d": "2027-09-15", "n": "中秋節翌日", "w": "Wed"}, {"d": "2027-10-01", "n": "國慶日", "w": "Fri"}, {"d": "2027-10-08", "n": "重陽節", "w": "Fri"}, {"d": "2027-12-25", "n": "聖誕節", "w": "Sat"}, {"d": "2027-12-27", "n": "聖誕節後第一個周日", "w": "Mon"}];
var HOLIDAY_MAP = {};
HOLIDAYS.forEach(function(h){ HOLIDAY_MAP[h.d] = h; });

// ===== v6 calc (preserve) =====
window.lvCalc = function() {
  var start = document.getElementById('lv-start').value;
  var end = document.getElementById('lv-end').value;
  var daysPerWeek = parseInt(document.getElementById('lv-days').value);
  var taken = parseInt(document.getElementById('lv-taken').value || 0);
  var out = document.getElementById('lv-out');
  if (!start || !end) { out.innerHTML = '<div class="lv-result">請填齊入職日期同計算至日期</div>'; return; }
  var s = new Date(start), e = new Date(end);
  if (e <= s) { out.innerHTML = '<div class="lv-result">計算至日期要晚過入職日期</div>'; return; }
  var years = (e - s) / (365.25 * 24 * 3600 * 1000);
  var entitled;
  if (years < 2) entitled = 7;
  else if (years < 5) entitled = 7;
  else if (years < 9) entitled = 11;
  else entitled = 14;
  if (daysPerWeek === 6) entitled = Math.round(entitled * 6 / 5);
  else if (daysPerWeek === 4) entitled = Math.round(entitled * 4 / 5);
  var remaining = Math.max(0, entitled - taken);
  var fmt = function(d){ return d.toISOString().slice(0,10); };
  out.innerHTML =
    '<div class="lv-result">' +
    '<div class="lv-result-row"><span>年資</span><strong>' + years.toFixed(1) + ' 年</strong></div>' +
    '<div class="lv-result-row"><span>應得年假</span><strong>' + entitled + ' 天</strong></div>' +
    '<div class="lv-result-row"><span>已放</span><strong>' + taken + ' 天</strong></div>' +
    '<div class="lv-result-row" style="border-top:2px solid #ff6210;padding-top:12px;margin-top:4px"><span style="font-size:1.05rem">剩餘可放</span><strong style="font-size:1.4rem;color:#ff6210">' + remaining + ' 天</strong></div>' +
    '</div>';
};

// ===== v7: HK Holidays + Smart Leave Planner =====
function fmtDate(d){ var m = String(d.getMonth()+1).padStart(2,'0'); var day = String(d.getDate()).padStart(2,'0'); return d.getFullYear()+'-'+m+'-'+day; }
function parseDate(s){ var p = s.split('-'); return new Date(+p[0], +p[1]-1, +p[2]); }
function addDays(d, n){ var r = new Date(d); r.setDate(r.getDate()+n); return r; }
function dayName(d){ return ['日','一','二','三','四','五','六'][d.getDay()]; }
function isWeekend(d){ return d.getDay() === 0 || d.getDay() === 6; }
function isHoliday(d){ return HOLIDAY_MAP[fmtDate(d)]; }
function isOff(d){ return isWeekend(d) || isHoliday(d); }

// Find best leave windows: scan 365 days, find longest off-streak reachable with N leave days
function planLeave(annualDays) {
  var start = new Date();
  var plans = [];
  var horizon = 365;
  for (var i = 0; i < horizon; i++) {
    var anchor = addDays(start, i);
    // Expand forward as long as consecutive off-days (must include at least 1 holiday)
    var streakEnd = anchor;
    var streakLen = 0;
    var hasHoliday = false;
    var leaveNeeded = 0;
    var cursor = anchor;
    while (cursor <= addDays(start, horizon)) {
      if (isOff(cursor)) {
        if (isHoliday(cursor)) hasHoliday = true;
        streakLen++;
      } else {
        if (hasHoliday) { leaveNeeded++; }
        else break;
      }
      cursor = addDays(cursor, 1);
      if (streakLen >= 14) break; // cap
    }
    if (hasHoliday && streakLen >= 4) {
      var offDays = 0;
      for (var j = 0; j < streakLen; j++) if (isOff(addDays(anchor, j))) offDays++;
      var leaveDays = streakLen - offDays;
      if (leaveDays > 0 && leaveDays <= annualDays) {
        var efficiency = streakLen / leaveDays;
        if (efficiency >= 2.0) {
          plans.push({
            start: fmtDate(anchor),
            end: fmtDate(addDays(anchor, streakLen - 1)),
            total: streakLen,
            leave: leaveDays,
            eff: efficiency.toFixed(1)
          });
        }
      }
    }
  }
  // Dedupe + sort by efficiency desc, top 8
  var seen = {};
  var uniq = [];
  plans.forEach(function(p){
    if (!seen[p.start]) { seen[p.start] = 1; uniq.push(p); }
  });
  uniq.sort(function(a,b){ return b.eff - a.eff; });
  return uniq.slice(0, 8);
}

window.lvPlan = function() {
  var taken = parseInt(document.getElementById('lv-taken').value || 0);
  var entitledEl = document.querySelector('[data-entitled]');
  var entitled = entitledEl ? parseInt(entitledEl.dataset.entitled) : 14;
  var remaining = entitled - taken;
  var out = document.getElementById('lv-plan-out');
  if (remaining <= 0) { out.innerHTML = '<div style="color:#991b1b;background:#fee2e2;padding:12px;border-radius:8px">你今年年假已用晒,等下年度再 plan 😢</div>'; return; }
  var plans = planLeave(remaining);
  if (!plans.length) { out.innerHTML = '<div>未搵到 high-efficiency long weekend,考慮連住放假 4-5 天自己 trip</div>'; return; }
  var html = '<div style="display:grid;gap:10px">';
  plans.forEach(function(p){
    var color = p.eff >= 5 ? '#10b981' : p.eff >= 3 ? '#ff6210' : '#0891b2';
    html += '<div style="border:2px solid '+color+';border-radius:10px;padding:12px;background:#fff">' +
      '<div style="display:flex;justify-content:space-between;align-items:center">' +
      '<div><div style="font-weight:600;color:#1a1a1a">'+p.start+' 至 '+p.end+'</div>' +
      '<div style="font-size:0.82rem;color:#6b4a3a">'+p.total+' 天連假</div></div>' +
      '<div style="text-align:right"><div style="font-size:1.6rem;font-weight:700;color:'+color+'">放 '+p.leave+' 天</div>' +
      '<div style="font-size:0.75rem;color:#6b4a3a">效率 '+p.eff+'x</div></div>' +
      '</div></div>';
  });
  html += '</div>';
  out.innerHTML = html;
};

window.lvRenderHolidays = function() {
  var year = document.getElementById('lv-year').value;
  var list = HOLIDAYS.filter(function(h){ return h.d.indexOf(year) === 0; });
  var html = '<div style="display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:8px;margin-top:10px">';
  list.forEach(function(h){
    var d = parseDate(h.d);
    var isLong = (h.n.indexOf('農曆年初') === 0 || h.n === '清明節' || h.n === '聖誕節' || h.n === '國慶日' || h.n === '勞動節');
    var bg = isLong ? '#fef3c7' : '#f0f9ff';
    var fg = isLong ? '#78350f' : '#075985';
    html += '<div style="background:'+bg+';color:'+fg+';padding:8px 12px;border-radius:8px;font-size:0.85rem">' +
      '<div style="font-weight:600">'+h.n+'</div>' +
      '<div style="font-size:0.78rem;opacity:0.85">'+h.d.slice(5)+' ('+dayName(d)+')</div>' +
      '</div>';
  });
  html += '</div>';
  document.getElementById('lv-hol-list').innerHTML = html;
};

// Auto-init
document.addEventListener('DOMContentLoaded', function(){
  var today = new Date();
  var oneYr = new Date(today); oneYr.setFullYear(oneYr.getFullYear()+1);
  var sd = document.getElementById('lv-start');
  var ed = document.getElementById('lv-end');
  if (sd && !sd.value) sd.value = fmtDate(addDays(today, -365));
  if (ed && !ed.value) ed.value = fmtDate(today);
  var yr = document.getElementById('lv-year');
  if (yr) { yr.value = today.getFullYear(); lvRenderHolidays(); }
});
})();