// web-ui/js/modules/calendar/CalendarView.js

/**
 * 캘린더 UI 렌더링 및 DOM 조작을 담당하는 전역 객체입니다.
 */
(function(window) {
  'use strict';

  const CalendarView = {
    elements: {},

    initializeElements: function() {
      this.elements.monthYearTitle = document.getElementById('monthYearTitle');
      this.elements.calendarDays = document.getElementById('calendarDays');
      this.elements.prevMonthBtn = document.getElementById('prevMonthBtn');
      this.elements.nextMonthBtn = document.getElementById('nextMonthBtn');
      this.elements.todayBtn = document.getElementById('todayBtn');
      this.elements.dailyWorkModal = document.getElementById('dailyWorkModal');
      this.elements.modalTitle = document.getElementById('modalTitle');
      this.elements.modalSummary = document.querySelector('.daily-summary');
      this.elements.modalTotalWorkers = document.getElementById('modalTotalWorkers');
      this.elements.modalTotalHours = document.getElementById('modalTotalHours');
      this.elements.modalTotalTasks = document.getElementById('modalTotalTasks');
      this.elements.modalErrorCount = document.getElementById('modalErrorCount');
      this.elements.modalWorkersList = document.getElementById('modalWorkersList');
      this.elements.modalNoData = document.getElementById('modalNoData');
      this.elements.statusFilter = document.getElementById('statusFilter');
      this.elements.loadingSpinner = document.getElementById('loadingSpinner');
    },

    showLoading: function(show) {
      if (this.elements.loadingSpinner) {
        this.elements.loadingSpinner.style.display = show ? 'flex' : 'none';
      }
    },

    showToast: function(message, type = 'info') {
      const existingToast = document.querySelector('.toast-message');
      if (existingToast) existingToast.remove();
      
      const toast = document.createElement('div');
      toast.className = `toast-message toast-${type}`;
      toast.textContent = message;
      document.body.appendChild(toast);
      
      setTimeout(() => toast.remove(), 3000);
    },

    renderCalendar: async function() {
      const year = CalendarState.currentDate.getFullYear();
      const month = CalendarState.currentDate.getMonth();
      
      const monthNames = ['1월', '2월', '3월', '4월', '5월', '6월', '7월', '8월', '9월', '10월', '11월', '12월'];
      this.elements.monthYearTitle.textContent = `${year}년 ${monthNames[month]}`;
      
      this.showLoading(true);
      try {
        const monthData = await CalendarAPI.getMonthlyCalendarData(year, month);
        const firstDay = new Date(year, month, 1);
        const lastDay = new Date(year, month + 1, 0);
        const startDate = new Date(firstDay);
        startDate.setDate(startDate.getDate() - firstDay.getDay());
        
        const today = new Date();
        const todayStr = `${today.getFullYear()}-${String(today.getMonth() + 1).padStart(2, '0')}-${String(today.getDate()).padStart(2, '0')}`;
        
        let calendarHTML = '';
        let currentDay = new Date(startDate);
        
        for (let i = 0; i < 42; i++) {
          const dateStr = `${currentDay.getFullYear()}-${String(currentDay.getMonth() + 1).padStart(2, '0')}-${String(currentDay.getDate()).padStart(2, '0')}`;
          const dayWorkData = monthData[dateStr] || { hasData: false, hasIssues: false, hasErrors: false, workerCount: 0 };
          const dayStatus = this.analyzeDayStatus(dayWorkData);
          
          let dayClasses = ['calendar-day'];
          if (currentDay.getMonth() !== month) dayClasses.push('other-month');
          if (dateStr === todayStr) dayClasses.push('today');
          if (currentDay.getDay() === 0) dayClasses.push('sunday');
          if (currentDay.getDay() === 6) dayClasses.push('saturday');

          const hasAnyProblem = dayStatus.hasOvertimeWarning || dayStatus.hasIncomplete || dayStatus.hasIssues;
          if (dayStatus.hasData && !hasAnyProblem) dayClasses.push('has-normal');

          let statusIcons = '';
          if (hasAnyProblem) {
            if (dayStatus.hasOvertimeWarning) statusIcons += '<div class="legend-icon purple">●</div>';
            if (dayStatus.hasIncomplete) statusIcons += '<div class="legend-icon red">●</div>';
            if (dayStatus.hasIssues) statusIcons += '<div class="legend-icon orange">●</div>';
          }
          
          calendarHTML += `<div class="${dayClasses.join(' ')}" onclick="openDailyWorkModal('${dateStr}')"><div class="day-number">${currentDay.getDate()}</div>${statusIcons}</div>`;
          currentDay.setDate(currentDay.getDate() + 1);
        }
        this.elements.calendarDays.innerHTML = calendarHTML;
      } catch (error) {
        console.error('캘린더 렌더링 오류:', error);
        this.showToast('캘린더를 불러오는데 실패했습니다.', 'error');
      } finally {
        this.showLoading(false);
      }
    },

    analyzeDayStatus: function(dayData) {
      if (dayData && typeof dayData === 'object' && 'totalWorkers' in dayData) {
        const totalRegisteredWorkers = CalendarState.allWorkers ? CalendarState.allWorkers.length : 0;
        const actualIncompleteWorkers = Math.max(0, totalRegisteredWorkers - dayData.workingWorkers);
        return {
          hasData: dayData.totalWorkers > 0,
          hasIssues: dayData.partialWorkers > 0,
          hasIncomplete: actualIncompleteWorkers > 0 || dayData.incompleteWorkers > 0,
          hasOvertimeWarning: dayData.hasOvertimeWarning || dayData.overtimeWarningWorkers > 0,
          workerCount: dayData.totalWorkers || 0
        };
      }
      return { hasData: false, hasIssues: false, hasErrors: false, workerCount: 0 };
    }
  };

  window.CalendarView = CalendarView;

})(window);