/**
 * 나의 출근 현황 페이지
 * 본인의 출근 기록과 근태 현황을 조회하고 표시합니다
 */

// 전역 상태
let currentYear = new Date().getFullYear();
let currentMonth = new Date().getMonth() + 1;
let attendanceData = [];
let vacationBalance = null;
let monthlyStats = null;

// 페이지 로드 시 초기화
document.addEventListener('DOMContentLoaded', () => {
  initializePage();
});

/**
 * 페이지 초기화
 */
function initializePage() {
  initializeYearMonthSelects();
  setupEventListeners();
  loadAttendanceData();
}

/**
 * 년도/월 선택 옵션 초기화
 */
function initializeYearMonthSelects() {
  const yearSelect = document.getElementById('yearSelect');
  const monthSelect = document.getElementById('monthSelect');

  // 년도 옵션 (현재 년도 기준 ±2년)
  const currentYearValue = new Date().getFullYear();
  for (let year = currentYearValue - 2; year <= currentYearValue + 2; year++) {
    const option = document.createElement('option');
    option.value = year;
    option.textContent = `${year}년`;
    if (year === currentYear) option.selected = true;
    yearSelect.appendChild(option);
  }

  // 월 옵션
  for (let month = 1; month <= 12; month++) {
    const option = document.createElement('option');
    option.value = month;
    option.textContent = `${month}월`;
    if (month === currentMonth) option.selected = true;
    monthSelect.appendChild(option);
  }
}

/**
 * 이벤트 리스너 설정
 */
function setupEventListeners() {
  // 조회 버튼
  document.getElementById('loadAttendance').addEventListener('click', () => {
    currentYear = parseInt(document.getElementById('yearSelect').value);
    currentMonth = parseInt(document.getElementById('monthSelect').value);
    loadAttendanceData();
  });

  // 탭 전환
  document.querySelectorAll('.tab-btn').forEach(btn => {
    btn.addEventListener('click', (e) => {
      const tabName = e.currentTarget.dataset.tab;
      switchTab(tabName);
    });
  });

  // 달력 네비게이션
  document.getElementById('prevMonth').addEventListener('click', () => {
    changeMonth(-1);
  });

  document.getElementById('nextMonth').addEventListener('click', () => {
    changeMonth(1);
  });
}

/**
 * 출근 데이터 로드
 */
async function loadAttendanceData() {
  try {
    showLoading();

    // 병렬로 데이터 로드
    const [attendanceRes, vacationRes, statsRes] = await Promise.all([
      window.apiGet(`/users/me/attendance-records?year=${currentYear}&month=${currentMonth}`),
      window.apiGet(`/users/me/vacation-balance?year=${currentYear}`),
      window.apiGet(`/users/me/monthly-stats?year=${currentYear}&month=${currentMonth}`)
    ]);

    attendanceData = attendanceRes.data || attendanceRes || [];
    vacationBalance = vacationRes.data || vacationRes;
    monthlyStats = statsRes.data || statsRes;

    // UI 업데이트
    updateStats();
    renderTable();
    renderCalendar();

  } catch (error) {
    console.error('출근 데이터 로드 실패:', error);
    showError('출근 데이터를 불러오는데 실패했습니다.');
  }
}

/**
 * 통계 업데이트
 */
function updateStats() {
  // 총 근무시간 (API는 month_hours 반환)
  const totalHours = monthlyStats?.month_hours || monthlyStats?.total_work_hours || 0;
  document.getElementById('totalHours').textContent = `${totalHours}시간`;

  // 근무일수
  const totalDays = monthlyStats?.work_days || 0;
  document.getElementById('totalDays').textContent = `${totalDays}일`;

  // 잔여 연차
  const remaining = vacationBalance?.remaining_annual_leave ||
                   (vacationBalance?.total_annual_leave || 0) - (vacationBalance?.used_annual_leave || 0);
  document.getElementById('remainingLeave').textContent = `${remaining}일`;
}

/**
 * 테이블 렌더링
 */
function renderTable() {
  const tbody = document.getElementById('attendanceTableBody');
  tbody.innerHTML = '';

  if (!attendanceData || attendanceData.length === 0) {
    tbody.innerHTML = '<tr><td colspan="7" class="empty-cell">출근 기록이 없습니다.</td></tr>';
    return;
  }

  attendanceData.forEach(record => {
    const tr = document.createElement('tr');
    tr.className = `attendance-row ${getStatusClass(record.attendance_type_code || record.type_code)}`;
    tr.onclick = () => showDetailModal(record);

    const date = new Date(record.record_date);
    const dayOfWeek = ['일', '월', '화', '수', '목', '금', '토'][date.getDay()];

    tr.innerHTML = `
      <td>${formatDate(record.record_date)}</td>
      <td>${dayOfWeek}</td>
      <td>${record.check_in_time || '-'}</td>
      <td>${record.check_out_time || '-'}</td>
      <td>${record.total_work_hours ? `${record.total_work_hours}h` : '-'}</td>
      <td><span class="status-badge ${getStatusClass(record.attendance_type_code || record.type_code)}">${getStatusText(record)}</span></td>
      <td class="notes-cell">${record.notes || '-'}</td>
    `;

    tbody.appendChild(tr);
  });
}

/**
 * 달력 렌더링
 */
function renderCalendar() {
  const calendarTitle = document.getElementById('calendarTitle');
  const calendarGrid = document.getElementById('calendarGrid');

  calendarTitle.textContent = `${currentYear}년 ${currentMonth}월`;

  // 달력 그리드 초기화
  calendarGrid.innerHTML = '';

  // 요일 헤더
  const weekdays = ['일', '월', '화', '수', '목', '금', '토'];
  weekdays.forEach(day => {
    const dayHeader = document.createElement('div');
    dayHeader.className = 'calendar-day-header';
    dayHeader.textContent = day;
    calendarGrid.appendChild(dayHeader);
  });

  // 해당 월의 첫날과 마지막 날
  const firstDay = new Date(currentYear, currentMonth - 1, 1);
  const lastDay = new Date(currentYear, currentMonth, 0);
  const daysInMonth = lastDay.getDate();
  const startDayOfWeek = firstDay.getDay();

  // 출근 데이터를 날짜별로 매핑
  const attendanceMap = {};
  if (attendanceData) {
    attendanceData.forEach(record => {
      const date = new Date(record.record_date);
      const day = date.getDate();
      attendanceMap[day] = record;
    });
  }

  // 빈 칸 (이전 달)
  for (let i = 0; i < startDayOfWeek; i++) {
    const emptyCell = document.createElement('div');
    emptyCell.className = 'calendar-day empty';
    calendarGrid.appendChild(emptyCell);
  }

  // 날짜 칸
  for (let day = 1; day <= daysInMonth; day++) {
    const dayCell = document.createElement('div');
    dayCell.className = 'calendar-day';

    const record = attendanceMap[day];
    if (record) {
      dayCell.classList.add('has-record', getStatusClass(record.attendance_type_code || record.type_code));
      dayCell.onclick = () => showDetailModal(record);
    }

    dayCell.innerHTML = `
      <div class="calendar-day-number">${day}</div>
      ${record ? `<div class="calendar-day-status">${getStatusIcon(record)}</div>` : ''}
    `;

    calendarGrid.appendChild(dayCell);
  }
}

/**
 * 탭 전환
 */
function switchTab(tabName) {
  // 탭 버튼 활성화 토글
  document.querySelectorAll('.tab-btn').forEach(btn => {
    btn.classList.toggle('active', btn.dataset.tab === tabName);
  });

  // 탭 컨텐츠 토글
  document.querySelectorAll('.tab-content').forEach(content => {
    content.classList.remove('active');
  });

  if (tabName === 'list') {
    document.getElementById('listView').classList.add('active');
  } else if (tabName === 'calendar') {
    document.getElementById('calendarView').classList.add('active');
  }
}

/**
 * 월 변경
 */
function changeMonth(offset) {
  currentMonth += offset;

  if (currentMonth < 1) {
    currentMonth = 12;
    currentYear--;
  } else if (currentMonth > 12) {
    currentMonth = 1;
    currentYear++;
  }

  // Select 박스 업데이트
  document.getElementById('yearSelect').value = currentYear;
  document.getElementById('monthSelect').value = currentMonth;

  loadAttendanceData();
}

/**
 * 상세 모달 표시
 */
function showDetailModal(record) {
  const modal = document.getElementById('detailModal');
  const modalBody = document.getElementById('modalBody');
  const modalTitle = document.getElementById('modalTitle');

  const date = new Date(record.record_date);
  modalTitle.textContent = `${formatDate(record.record_date)} 출근 상세`;

  modalBody.innerHTML = `
    <div class="detail-grid">
      <div class="detail-item">
        <label>날짜</label>
        <div>${formatDate(record.record_date)}</div>
      </div>
      <div class="detail-item">
        <label>출근 상태</label>
        <div><span class="status-badge ${getStatusClass(record.attendance_type_code || record.type_code)}">${getStatusText(record)}</span></div>
      </div>
      <div class="detail-item">
        <label>출근 시간</label>
        <div>${record.check_in_time || '기록 없음'}</div>
      </div>
      <div class="detail-item">
        <label>퇴근 시간</label>
        <div>${record.check_out_time || '기록 없음'}</div>
      </div>
      <div class="detail-item">
        <label>총 근무 시간</label>
        <div>${record.total_work_hours ? `${record.total_work_hours} 시간` : '계산 불가'}</div>
      </div>
      ${record.vacation_type_name ? `
        <div class="detail-item">
          <label>휴가 유형</label>
          <div>${record.vacation_type_name}</div>
        </div>
      ` : ''}
      ${record.notes ? `
        <div class="detail-item full-width">
          <label>비고</label>
          <div>${record.notes}</div>
        </div>
      ` : ''}
    </div>
  `;

  modal.style.display = 'block';
}

/**
 * 모달 닫기
 */
function closeDetailModal() {
  document.getElementById('detailModal').style.display = 'none';
}

// 모달 외부 클릭 시 닫기
window.onclick = function(event) {
  const modal = document.getElementById('detailModal');
  if (event.target === modal) {
    closeDetailModal();
  }
};

/**
 * 유틸리티 함수들
 */

function formatDate(dateString) {
  const date = new Date(dateString);
  const month = String(date.getMonth() + 1).padStart(2, '0');
  const day = String(date.getDate()).padStart(2, '0');
  return `${month}/${day}`;
}

function getStatusClass(typeCode) {
  const typeMap = {
    'NORMAL': 'normal',
    'LATE': 'late',
    'EARLY_LEAVE': 'early',
    'ABSENT': 'absent',
    'VACATION': 'vacation'
  };
  return typeMap[typeCode] || 'normal';
}

function getStatusText(record) {
  if (record.vacation_type_name) {
    return record.vacation_type_name;
  }
  return record.attendance_type_name || record.type_name || '정상';
}

function getStatusIcon(record) {
  const typeCode = record.attendance_type_code || record.type_code;
  const iconMap = {
    'NORMAL': '✓',
    'LATE': '⚠',
    'EARLY_LEAVE': '⏰',
    'ABSENT': '✗',
    'VACATION': '🌴'
  };
  return iconMap[typeCode] || '✓';
}

function showLoading() {
  const tbody = document.getElementById('attendanceTableBody');
  tbody.innerHTML = '<tr><td colspan="7" class="loading-cell">데이터를 불러오는 중...</td></tr>';
}

function showError(message) {
  const tbody = document.getElementById('attendanceTableBody');
  tbody.innerHTML = `<tr><td colspan="7" class="error-cell">${message}</td></tr>`;

  // 통계 초기화
  document.getElementById('totalHours').textContent = '-';
  document.getElementById('totalDays').textContent = '-';
  document.getElementById('remainingLeave').textContent = '-';
}