<%
  // ─── Calendar — M1 + M2 + M3 ────────────────────────────────────────────────
  //
  // Folder-scoped sibling of
  //   /home/kuray/01_NextJS_Components/modules/app/Calendar/index.tsx
  //
  // File-for-file parallels:
  //   partials/_header.ejs       ← parts/HeaderBar.tsx
  //   partials/_month.ejs        ← views/MonthView.tsx
  //   partials/_week.ejs         ← views/WeekView.tsx
  //   partials/_day.ejs          ← views/DayView.tsx
  //   partials/_agenda.ejs       ← views/AgendaView.tsx (M5 stub)
  //   partials/_event-card.ejs   ← parts/EventCard.tsx
  //   scripts/calendar.js        ← view-state + nav (parallel of index.tsx state)
  //   scripts/keyboard.js        ← hooks/useKeyboardNav.ts
  //   scripts/popover.js         ← parts/EventPopover.tsx          (M2)
  //   scripts/drag.js            ← hooks/useDragMove + useResize + useDragCreate (M2)
  //   RRULE expander (inline)    ← rrule.ts + hooks/useRecurrence.ts (M3, server-side)
  //   partials/_legend.ejs       ← parts/CalendarLegend.tsx                       (M4)
  //   partials/_resource.ejs     ← views/ResourceView.tsx                         (M4)
  //   scripts/legend.js          ← multi-calendar visibility toggle               (M4)
  //
  // M5-M6 still stubbed.

  var _id           = locals.id           || ('cal-' + Math.random().toString(36).substr(2, 6));
  var _events       = locals.events       || [];
  var _view         = locals.view         || 'month';
  var _defaultDate  = locals.defaultDate  ? new Date(locals.defaultDate) : new Date();
  var _locale       = (locals.locale      || 'tr').toLowerCase().slice(0, 2);
  var _workingHours = locals.workingHours || null;
  var _slotMinutes  = Number(locals.slotMinutes) > 0 ? Number(locals.slotMinutes) : 30;
  var _className    = locals.className    || '';
  var _resources    = Array.isArray(locals.resources) ? locals.resources : [];
  var _calendars    = Array.isArray(locals.calendars) ? locals.calendars : [];
  var _hideLegend   = !!locals.hideCalendarLegend;

  // Normalise events — accept ISO strings or Date instances; preserve rrule + exceptions.
  _events = _events.map(function (e) {
    return Object.assign({}, e, {
      start: e.start instanceof Date ? e.start : new Date(e.start),
      end:   e.end   instanceof Date ? e.end   : new Date(e.end),
      exceptions: Array.isArray(e.exceptions)
        ? e.exceptions.map(function (x) { return x instanceof Date ? x : new Date(x); })
        : undefined
    });
  });

  // ── Locale bundles (mirror locale/tr.ts + en.ts) ──────────────────────────
  var LOCALES = {
    tr: {
      messages: {
        today: 'Bugün', previous: 'Önceki', next: 'Sonraki',
        month: 'Ay', week: 'Hafta', day: 'Gün',
        agenda: 'Ajanda', resource: 'Kaynak',
        allDay: 'Tüm gün', noEvents: 'Etkinlik yok',
        edit: 'Düzenle', delete: 'Sil', confirmDelete: 'Silinsin mi?', close: 'Kapat',
        calendars: 'Takvimler', noResources: 'Kaynak tanımlı değil',
        search: 'Etkinliklerde ara…',
        showing: function (label) { return label + ' gösteriliyor'; },
        cellLabel: function (date, count) {
          return count > 0 ? date + ', ' + count + ' etkinlik' : date + ', etkinlik yok';
        }
      },
      weekStart: 1,
      monthNames: ['Ocak','Şubat','Mart','Nisan','Mayıs','Haziran','Temmuz','Ağustos','Eylül','Ekim','Kasım','Aralık'],
      dayShort:   ['Paz','Pzt','Sal','Çar','Per','Cum','Cmt'],
      dayLong:    ['Pazar','Pazartesi','Salı','Çarşamba','Perşembe','Cuma','Cumartesi']
    },
    en: {
      messages: {
        today: 'Today', previous: 'Previous', next: 'Next',
        month: 'Month', week: 'Week', day: 'Day',
        agenda: 'Agenda', resource: 'Resource',
        allDay: 'All-day', noEvents: 'No events',
        edit: 'Edit', delete: 'Delete', confirmDelete: 'Confirm delete?', close: 'Close',
        calendars: 'Calendars', noResources: 'No resources defined',
        search: 'Search events…',
        showing: function (label) { return 'Showing ' + label; },
        cellLabel: function (date, count) {
          return count === 0 ? date + ', no events'
               : count === 1 ? date + ', 1 event'
               : date + ', ' + count + ' events';
        }
      },
      weekStart: 0,
      monthNames: ['January','February','March','April','May','June','July','August','September','October','November','December'],
      dayShort:   ['Sun','Mon','Tue','Wed','Thu','Fri','Sat'],
      dayLong:    ['Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday']
    }
  };
  var L = LOCALES[_locale] || LOCALES.tr;
  if (locals.messages) {
    L = Object.assign({}, L, { messages: Object.assign({}, L.messages, locals.messages) });
  }

  // ── Date helpers (mirror date-utils.ts) ───────────────────────────────────
  function startOfDay(d) { var x = new Date(d); x.setHours(0,0,0,0); return x; }
  function endOfDay(d)   { var x = new Date(d); x.setHours(23,59,59,999); return x; }
  function isSameDay(a, b) {
    return a.getFullYear() === b.getFullYear() && a.getMonth() === b.getMonth() && a.getDate() === b.getDate();
  }
  function isSameMonth(a, b) { return a.getFullYear() === b.getFullYear() && a.getMonth() === b.getMonth(); }
  function addDays(d, n) { var x = new Date(d); x.setDate(x.getDate() + n); return x; }
  function addMonths(d, n) { var x = new Date(d); x.setMonth(x.getMonth() + n); return x; }
  function startOfWeek(d, ws) { var x = startOfDay(d); var diff = (x.getDay() - ws + 7) % 7; return addDays(x, -diff); }
  function endOfWeek(d, ws) { return addDays(startOfWeek(d, ws), 6); }
  function rangeDays(from, n) { var out = []; for (var i = 0; i < n; i++) out.push(addDays(from, i)); return out; }
  function monthGrid(d, ws) {
    var first = new Date(d.getFullYear(), d.getMonth(), 1);
    return rangeDays(startOfWeek(first, ws), 42);
  }
  function eventOnDay(e, day) {
    var ds = startOfDay(day).getTime();
    return e.start.getTime() < ds + 24*60*60*1000 && e.end.getTime() > ds;
  }
  function fmtTime(d) {
    return String(d.getHours()).padStart(2, '0') + ':' + String(d.getMinutes()).padStart(2, '0');
  }
  function minutesIntoDay(d) { return d.getHours() * 60 + d.getMinutes(); }

  // ── RRULE expander (mirror rrule.ts) ──────────────────────────────────────
  // Supports FREQ (DAILY/WEEKLY/MONTHLY/YEARLY) + INTERVAL + COUNT + UNTIL + BYDAY.
  var DAY_MAP = { SU:0, MO:1, TU:2, WE:3, TH:4, FR:5, SA:6 };
  function parseRRule(input) {
    var parts = String(input).trim().split(';').map(function (p) { return p.trim(); }).filter(Boolean);
    var map = {};
    for (var i = 0; i < parts.length; i++) {
      var eq = parts[i].indexOf('=');
      if (eq < 0) continue;
      map[parts[i].slice(0, eq).toUpperCase()] = parts[i].slice(eq + 1);
    }
    var freq = map.FREQ;
    if (!freq || ['DAILY','WEEKLY','MONTHLY','YEARLY'].indexOf(freq) < 0) {
      throw new Error('Invalid RRULE: ' + input);
    }
    var until;
    if (map.UNTIL) {
      var v = map.UNTIL.trim();
      if (/^\d{8}$/.test(v)) {
        until = new Date(+v.slice(0,4), +v.slice(4,6)-1, +v.slice(6,8), 23,59,59,999);
      } else if (/^\d{8}T\d{6}Z?$/.test(v)) {
        until = new Date(v.slice(0,4)+'-'+v.slice(4,6)+'-'+v.slice(6,8)+'T'+v.slice(9,11)+':'+v.slice(11,13)+':'+v.slice(13,15)+(v.endsWith('Z')?'Z':''));
      } else { until = new Date(v); }
    }
    var byDay;
    if (map.BYDAY) {
      byDay = map.BYDAY.split(',').map(function (d) { return DAY_MAP[d.trim().toUpperCase()]; }).filter(function (n) { return Number.isInteger(n); });
    }
    return {
      freq: freq,
      interval: Math.max(1, Number(map.INTERVAL || '1') || 1),
      count: map.COUNT ? Math.max(1, Number(map.COUNT)) : undefined,
      until: until,
      byDay: byDay
    };
  }
  function stepFreq(d, freq, interval) {
    if (freq === 'DAILY')  return addDays(d, interval);
    if (freq === 'WEEKLY') return addDays(d, 7 * interval);
    if (freq === 'MONTHLY') return addMonths(d, interval);
    var x = new Date(d); x.setFullYear(x.getFullYear() + interval); return x;
  }
  function withTimeOfDay(day, time) {
    var x = new Date(day);
    x.setHours(time.getHours(), time.getMinutes(), time.getSeconds(), time.getMilliseconds());
    return x;
  }
  function expandRRule(rule, dtstart, winStart, winEnd, hardCap) {
    hardCap = hardCap || 1000;
    var out = [];
    var stopAt = (rule.until && rule.until.getTime() < winEnd.getTime()) ? rule.until : winEnd;
    var produced = 0;
    function emit(d) {
      produced += 1;
      if (d.getTime() >= winStart.getTime() && d.getTime() <= stopAt.getTime()) out.push(d);
    }
    if (rule.freq === 'WEEKLY' && rule.byDay && rule.byDay.length) {
      var weekDays = rule.byDay.slice().sort(function (a,b){ return a-b; });
      var anchor = addDays(startOfDay(dtstart), -dtstart.getDay());
      while (out.length < hardCap && (!rule.count || produced < rule.count)) {
        for (var j = 0; j < weekDays.length; j++) {
          var occ = withTimeOfDay(addDays(anchor, weekDays[j]), dtstart);
          if (occ.getTime() < dtstart.getTime()) continue;
          if (occ.getTime() > stopAt.getTime()) return out;
          emit(occ);
          if (rule.count && produced >= rule.count) return out;
        }
        anchor = addDays(anchor, 7 * rule.interval);
        if (anchor.getTime() > stopAt.getTime()) return out;
      }
      return out;
    }
    var cursor = new Date(dtstart);
    while (out.length < hardCap && cursor.getTime() <= stopAt.getTime()) {
      emit(cursor);
      if (rule.count && produced >= rule.count) return out;
      cursor = stepFreq(cursor, rule.freq, rule.interval);
    }
    return out;
  }
  function isException(d, exceptions) {
    if (!exceptions || !exceptions.length) return false;
    for (var i = 0; i < exceptions.length; i++) if (isSameDay(exceptions[i], d)) return true;
    return false;
  }

  // ── Visible window + recurrence expansion (mirror useRecurrence + visibleWindow) ──
  function visibleWindow(view, date, ws) {
    if (view === 'month' || view === 'agenda' || view === 'resource') {
      var cells = monthGrid(date, ws);
      return [startOfDay(cells[0]), endOfDay(cells[cells.length - 1])];
    }
    if (view === 'week') {
      var s = startOfWeek(date, ws);
      return [startOfDay(s), endOfDay(rangeDays(s, 7)[6])];
    }
    return [startOfDay(date), endOfDay(date)];
  }
  var _win   = visibleWindow(_view, _defaultDate, L.weekStart);
  var _wStart = _win[0], _wEnd = _win[1];
  var _visibleEvents = [];
  for (var _ei = 0; _ei < _events.length; _ei++) {
    var _ev = _events[_ei];
    if (!_ev.rrule) { _visibleEvents.push(_ev); continue; }
    var _parsed;
    try { _parsed = parseRRule(_ev.rrule); } catch (_err) { _visibleEvents.push(_ev); continue; }
    var _dur  = _ev.end.getTime() - _ev.start.getTime();
    var _occs = expandRRule(_parsed, _ev.start, _wStart, _wEnd);
    for (var _oi = 0; _oi < _occs.length; _oi++) {
      if (isException(_occs[_oi], _ev.exceptions)) continue;
      _visibleEvents.push(Object.assign({}, _ev, {
        id: _ev.id + '::' + _occs[_oi].toISOString(),
        start: _occs[_oi],
        end:   new Date(_occs[_oi].getTime() + _dur),
        parentId: _ev.id,
        isRecurrence: true
      }));
    }
  }
  _events = _visibleEvents;

  // Period label
  function periodLabel() {
    var d = _defaultDate;
    var mn = L.monthNames[d.getMonth()];
    if (_view === 'month' || _view === 'agenda' || _view === 'resource') {
      return mn + ' ' + d.getFullYear();
    }
    if (_view === 'week') {
      var s = startOfWeek(d, L.weekStart), e = endOfWeek(d, L.weekStart);
      if (s.getMonth() === e.getMonth()) {
        return s.getDate() + ' – ' + e.getDate() + ' ' + L.monthNames[s.getMonth()] + ' ' + s.getFullYear();
      }
      return s.getDate() + ' ' + L.monthNames[s.getMonth()] + ' – ' + e.getDate() + ' ' + L.monthNames[e.getMonth()] + ' ' + e.getFullYear();
    }
    return d.getDate() + ' ' + mn + ' ' + d.getFullYear();
  }

  var _today = new Date();

  // ── Color tokens (mirror colors.ts) ───────────────────────────────────────
  var COLOR_PILL = {
    primary:   'bg-primary text-primary-fg',
    success:   'bg-success text-success-fg',
    warning:   'bg-warning text-text-primary',
    error:     'bg-error text-primary-fg',
    info:      'bg-info text-primary-fg',
    secondary: 'bg-secondary text-primary-fg',
    neutral:   'bg-surface-overlay text-text-primary border border-border'
  };
  var COLOR_DOT = {
    primary:'bg-primary', success:'bg-success', warning:'bg-warning',
    error:'bg-error', info:'bg-info', secondary:'bg-secondary', neutral:'bg-text-secondary'
  };
  function pillCls(c) { return COLOR_PILL[c || 'primary'] || COLOR_PILL.primary; }
  function dotCls(c)  { return COLOR_DOT[c || 'primary'] || COLOR_DOT.primary; }

  // ── effectiveColor (mirror colors.ts) — event.color → calendar.color → 'primary'
  function calendarById(id) {
    for (var i = 0; i < _calendars.length; i++) if (_calendars[i].id === id) return _calendars[i];
    return null;
  }
  function effectiveColor(e) {
    if (e.color) return e.color;
    if (e.calendarId) {
      var c = calendarById(e.calendarId);
      if (c && c.color) return c.color;
    }
    return 'primary';
  }
  // Resolve each event's effective color once so downstream partials don't
  // need access to the _calendars list.
  _events = _events.map(function (e) { return Object.assign({}, e, { color: effectiveColor(e) }); });
%>

  <%- include('./partials/_header', {
    _id: _id, _view: _view, _label: periodLabel(), _msg: L.messages
  }) %>

  <%# Live regions for screen-reader nav announcements (M6) %>
  

  


  <% if (!_hideLegend && _calendars.length > 0) { %>
    <%- include('./partials/_legend', { _id: _id, _calendars: _calendars, _msg: L.messages, _dotCls: dotCls }) %>
  <% } %>

  <% if (_view === 'month') { %>
    <%- include('./partials/_month', {
      _id: _id, _date: _defaultDate, _events: _events, _today: _today, _L: L,
      _isSameDay: isSameDay, _isSameMonth: isSameMonth, _eventOnDay: eventOnDay,
      _monthGrid: monthGrid, _pillCls: pillCls, _fmtTime: fmtTime
    }) %>
  <% } else if (_view === 'week') { %>
    <%- include('./partials/_week', {
      _id: _id, _date: _defaultDate, _events: _events, _today: _today, _L: L,
      _workingHours: _workingHours, _slotMinutes: _slotMinutes,
      _isSameDay: isSameDay, _eventOnDay: eventOnDay, _rangeDays: rangeDays,
      _startOfWeek: startOfWeek, _pillCls: pillCls, _fmtTime: fmtTime,
      _minutesIntoDay: minutesIntoDay
    }) %>
  <% } else if (_view === 'day') { %>
    <%- include('./partials/_day', {
      _id: _id, _date: _defaultDate, _events: _events, _today: _today, _L: L,
      _workingHours: _workingHours, _slotMinutes: _slotMinutes,
      _isSameDay: isSameDay, _eventOnDay: eventOnDay,
      _pillCls: pillCls, _fmtTime: fmtTime, _minutesIntoDay: minutesIntoDay
    }) %>
  <% } else if (_view === 'agenda') { %>
    <%- include('./partials/_agenda', {
      _id: _id, _events: _events, _today: _today, _L: L,
      _windowStart: _wStart, _windowEnd: _wEnd,
      _isSameDay: isSameDay, _fmtTime: fmtTime
    }) %>
  <% } else if (_view === 'resource') { %>
    <%- include('./partials/_resource', {
      _id: _id, _date: _defaultDate, _events: _events, _today: _today, _L: L,
      _resources: _resources, _workingHours: _workingHours, _slotMinutes: _slotMinutes,
      _isSameDay: isSameDay, _pillCls: pillCls, _fmtTime: fmtTime,
      _minutesIntoDay: minutesIntoDay
    }) %>
  <% } %>