import QRCode from 'qrcode';

export interface QRPrintItem {
  type: 'asset' | 'location';
  code: string;
  title: string;          // e.g. "[ HM IT ASSET ]" or "[ HM LOCATION ]"
  subtitle?: string;      // e.g. "가을-PC(i5-12400F)" or "기술개발센터 서버실"
  dept?: string;          // e.g. "전산" or "B-03 랙"
  user?: string;          // e.g. "박노석"
  date?: string;          // e.g. "2024-08-05"
}

/**
 * QR 라벨 인쇄 유틸리티 클래스
 */
export class QRPrinter {
  private static styleId = 'qr-print-style';
  private static containerId = 'label-print-container';

  /**
   * 인쇄 전용 CSS 스타일 주입
   */
  private static injectStyles() {
    if (document.getElementById(this.styleId)) return;

    const style = document.createElement('style');
    style.id = this.styleId;
    style.innerHTML = `
      /* 화면에서는 인쇄 컨테이너 숨김 */
      #${this.containerId} {
        display: none;
      }

      @media print {
        /* 화면 내 모든 요소 숨김 */
        body > *:not(#${this.containerId}) {
          display: none !important;
        }

        /* 인쇄 전용 컨테이너 표시 */
        #${this.containerId} {
          display: block !important;
          position: absolute;
          left: 0;
          top: 0;
          width: 50mm;
          height: 30mm;
          margin: 0;
          padding: 0;
          box-sizing: border-box;
          background: #fff;
        }

        /* 페이지 규격 설정 */
        @page {
          size: 50mm 30mm;
          margin: 0;
        }

        /* 개별 라벨 스타일 */
        .print-label-item {
          display: flex !important;
          flex-direction: row;
          width: 50mm;
          height: 30mm;
          box-sizing: border-box;
          padding: 2.5mm;
          page-break-after: always;
          font-family: 'Pretendard Variable', sans-serif;
          color: #000;
          background: #fff;
          overflow: hidden;
        }

        .print-label-item:last-child {
          page-break-after: avoid;
        }

        /* 왼쪽 명세 영역 */
        .label-details {
          width: 30mm;
          display: flex;
          flex-direction: column;
          justify-content: space-between;
          font-size: 6.5pt;
          line-height: 1.25;
          text-align: left;
          padding-right: 1mm;
          word-break: break-all;
        }

        .label-header {
          font-size: 7.5pt;
          font-weight: 800;
          border-bottom: 0.5px solid #000;
          padding-bottom: 0.5mm;
          margin-bottom: 0.5mm;
          color: #000;
        }

        .label-row {
          display: flex;
          margin-bottom: 0.2mm;
        }

        .label-row .row-title {
          font-weight: 700;
          width: 9.5mm;
          flex-shrink: 0;
        }

        .label-row .row-value {
          flex: 1;
        }

        /* 오른쪽 QR 영역 */
        .label-qr-wrapper {
          width: 15mm;
          display: flex;
          flex-direction: column;
          justify-content: center;
          align-items: center;
        }

        .label-qr-canvas {
          width: 14mm !important;
          height: 14mm !important;
          display: block;
        }
        
        .label-qr-code-text {
          font-size: 5.5pt;
          font-weight: 700;
          margin-top: 1mm;
          text-align: center;
          width: 15mm;
          overflow: hidden;
          text-overflow: ellipsis;
          white-space: nowrap;
        }
      }
    `;
    document.head.appendChild(style);
  }

  /**
   * 라벨 인쇄 실행
   */
  public static async print(items: QRPrintItem[]): Promise<void> {
    if (items.length === 0) return;

    this.injectStyles();

    // 기존 컨테이너 제거
    const oldContainer = document.getElementById(this.containerId);
    if (oldContainer) oldContainer.remove();

    // 새 인쇄 컨테이너 생성
    const container = document.createElement('div');
    container.id = this.containerId;
    document.body.appendChild(container);

    for (let i = 0; i < items.length; i++) {
      const item = items[i];
      const labelDiv = document.createElement('div');
      labelDiv.className = 'print-label-item';

      // QR 접속 URL 정의
      const paramName = item.type === 'asset' ? 'asset' : 'loc';
      const qrUrl = `${window.location.origin}/mobile?${paramName}=${encodeURIComponent(item.code)}`;

      // HTML 구성
      if (item.type === 'asset') {
        labelDiv.innerHTML = `
          <div class="label-details">
            <div class="label-header">${item.title}</div>
            <div class="label-row">
              <span class="row-title">자산번호 :</span>
              <span class="row-value">${item.code}</span>
            </div>
            <div class="label-row">
              <span class="row-title">자 산 명 :</span>
              <span class="row-value">${item.subtitle || '-'}</span>
            </div>
            <div class="label-row">
              <span class="row-title">부    서 :</span>
              <span class="row-value">${item.dept || '-'}</span>
            </div>
            <div class="label-row">
              <span class="row-title">사 용 자 :</span>
              <span class="row-value">${item.user || '-'}</span>
            </div>
          </div>
          <div class="label-qr-wrapper">
            <canvas class="label-qr-canvas" id="qr-canvas-${i}"></canvas>
            <div class="label-qr-code-text">${item.code}</div>
          </div>
        `;
      } else {
        // Location 라벨 레이아웃
        labelDiv.innerHTML = `
          <div class="label-details" style="justify-content: center; gap: 1mm;">
            <div class="label-header">${item.title}</div>
            <div class="label-row">
              <span class="row-title">위치코드 :</span>
              <span class="row-value" style="font-weight: 700;">${item.code}</span>
            </div>
            <div class="label-row">
              <span class="row-title">구    역 :</span>
              <span class="row-value">${item.subtitle || '-'}</span>
            </div>
            <div class="label-row">
              <span class="row-title">상세위치 :</span>
              <span class="row-value">${item.dept || '-'}</span>
            </div>
          </div>
          <div class="label-qr-wrapper">
            <canvas class="label-qr-canvas" id="qr-canvas-${i}"></canvas>
            <div class="label-qr-code-text">${item.code}</div>
          </div>
        `;
      }

      container.appendChild(labelDiv);

      // QR 코드 렌더링
      const canvas = document.getElementById(`qr-canvas-${i}`) as HTMLCanvasElement;
      if (canvas) {
        await QRCode.toCanvas(canvas, qrUrl, {
          margin: 0,
          width: 100,
          errorCorrectionLevel: 'H'
        });
      }
    }

    // 약간의 딜레이를 주어 QR 코드가 완전히 렌더링되도록 함
    setTimeout(() => {
      window.print();
      // 인쇄 완료 후 컨테이너 정리
      window.onafterprint = () => {
        container.remove();
      };
    }, 250);
  }
}