// /js/report-viewer-ui.js

/**
 * 데이터를 가공하여 UI에 표시하기 좋은 요약 형태로 변환합니다.
 * @param {Array} rawData - 서버에서 받은 원시 데이터 배열
 * @param {string} selectedDate - 선택된 날짜
 * @returns {object} - 요약 정보와 작업자별로 그룹화된 데이터를 포함하는 객체
 */
export function processReportData(rawData, selectedDate) {
  if (!Array.isArray(rawData) || rawData.length === 0) {
    return null;
  }

  const workerGroups = {};
  let totalHours = 0;
  let errorCount = 0;

  rawData.forEach(item => {
    const workerName = item.worker_name || '미지정';
    const workHours = parseFloat(item.work_hours || 0);
    totalHours += workHours;
    if (item.work_status_id === 2) errorCount++; // '에러' 상태 ID가 2라고 가정

    if (!workerGroups[workerName]) {
      workerGroups[workerName] = {
        worker_name: workerName,
        total_hours: 0,
        entries: []
      };
    }
    workerGroups[workerName].total_hours += workHours;
    workerGroups[workerName].entries.push(item);
  });

  return {
    summary: {
      date: selectedDate,
      total_workers: Object.keys(workerGroups).length,
      total_hours: totalHours,
      total_entries: rawData.length,
      error_count: errorCount
    },
    workers: Object.values(workerGroups)
  };
}

function displaySummary(summary) {
  const elements = {
    totalWorkers: summary.total_workers,
    totalHours: `${summary.total_hours}시간`,
    totalEntries: `${summary.total_entries}개`,
    errorCount: `${summary.error_count}개`
  };
  Object.entries(elements).forEach(([id, value]) => {
    const el = document.getElementById(id);
    if (el) el.textContent = value;
  });
  document.getElementById('reportSummary').style.display = 'block';
}

function createWorkEntryElement(entry) {
    const entryDiv = document.createElement('div');
    entryDiv.className = `work-entry ${entry.work_status_id === 2 ? 'error-entry' : ''}`;
    entryDiv.innerHTML = `
        <div class="entry-header">
            <div class="project-name">${entry.project_name || '프로젝트 미지정'}</div>
            <div class="work-hours">${entry.work_hours || 0}시간</div>
        </div>
        <div class="entry-details">
            <div class="entry-detail">
                <span class="detail-label">작업 유형:</span>
                <span class="detail-value">${entry.work_type_name || '-'}</span>
            </div>
            ${entry.work_status_id === 2 ? `
            <div class="entry-detail">
                <span class="detail-label">에러 유형:</span>
                <span class="detail-value error-type">${entry.error_type_name || '에러'}</span>
            </div>` : ''}
        </div>
    `;
    return entryDiv;
}

function displayWorkersDetails(workers) {
  const workersListEl = document.getElementById('workersList');
  workersListEl.innerHTML = '';
  workers.forEach(worker => {
    const workerCard = document.createElement('div');
    workerCard.className = 'worker-card';
    workerCard.innerHTML = `
      <div class="worker-header">
        <div class="worker-name">👤 ${worker.worker_name}</div>
        <div class="worker-total-hours">총 ${worker.total_hours}시간</div>
      </div>
    `;
    const entriesContainer = document.createElement('div');
    entriesContainer.className = 'work-entries';
    worker.entries.forEach(entry => entriesContainer.appendChild(createWorkEntryElement(entry)));
    workerCard.appendChild(entriesContainer);
    workersListEl.appendChild(workerCard);
  });
  document.getElementById('workersReport').style.display = 'block';
}

const hideElement = (id) => {
    const el = document.getElementById(id);
    if (el) el.style.display = 'none';
};

/**
 * 가공된 데이터를 받아 화면 전체를 렌더링합니다.
 * @param {object|null} processedData - 가공된 데이터 또는 데이터가 없을 경우 null
 */
export function renderReport(processedData) {
  hideElement('loadingSpinner');
  hideElement('errorMessage');
  hideElement('noDataMessage');
  hideElement('reportSummary');
  hideElement('workersReport');
  hideElement('exportSection');

  if (!processedData) {
    document.getElementById('noDataMessage').style.display = 'block';
    return;
  }
  displaySummary(processedData.summary);
  displayWorkersDetails(processedData.workers);
  document.getElementById('exportSection').style.display = 'block';
}

export function showLoading(isLoading) {
    document.getElementById('loadingSpinner').style.display = isLoading ? 'flex' : 'none';
    if(isLoading) {
        hideElement('errorMessage');
        hideElement('noDataMessage');
    }
}

export function showError(message) {
    const errorEl = document.getElementById('errorMessage');
    errorEl.querySelector('.error-text').textContent = message;
    errorEl.style.display = 'block';
    hideElement('loadingSpinner');
}