// ITAM Mobile Audit Scanner Main Business Logic

const SESSION_LOC_KEY = 'itam_audit_locked_location';

document.addEventListener('DOMContentLoaded', () => {
  const locDisplay = document.getElementById('loc-display')!;
  const unlockBtn = document.getElementById('btn-unlock-loc') as HTMLButtonElement;
  const feedbackEl = document.getElementById('scan-feedback')!;
  const manualToggleBtn = document.getElementById('btn-toggle-manual')!;
  const manualForm = document.getElementById('manual-form')!;
  const manualInput = document.getElementById('manual-code-input') as HTMLInputElement;
  const manualSubmitBtn = document.getElementById('btn-submit-manual') as HTMLButtonElement;

  let html5QrcodeScanner: any = null;

  // Initialize UI based on current session lock
  updateLocationUI();

  // Parse URL parameters for immediate processing (convenience for direct QR scans)
  parseUrlParams();

  // Initialize HTML5 QR Code Scanner
  initScanner();

  // Bind UI Events
  unlockBtn.addEventListener('click', () => {
    sessionStorage.removeItem(SESSION_LOC_KEY);
    showFeedback('위치 잠금이 해제되었습니다.', 'success');
    updateLocationUI();
  });

  manualToggleBtn.addEventListener('click', () => {
    const isHidden = window.getComputedStyle(manualForm).display === 'none';
    manualForm.style.display = isHidden ? 'flex' : 'none';
    manualToggleBtn.textContent = isHidden ? '스캐너 카메라로 스캔하기' : '카메라가 안 되나요? 수동 코드로 입력';
  });

  manualSubmitBtn.addEventListener('click', () => {
    const code = manualInput.value.trim();
    if (!code) return;
    processScannedCode(code);
    manualInput.value = '';
  });

  // --- Core Scanner Functions ---

  function initScanner() {
    try {
      // Create Html5Qrcode instance
      // Using Html5Qrcode directly instead of Html5QrcodeScanner for customized viewport control
      const html5QrCode = new (window as any).Html5Qrcode("reader");
      
      const config = {
        fps: 10,
        qrbox: (width: number, height: number) => {
          const size = Math.min(width, height) * 0.7;
          return { width: size, height: size };
        },
        aspectRatio: 1.0
      };

      // Start scanning using the rear camera
      html5QrCode.start(
        { facingMode: "environment" },
        config,
        (decodedText: string) => {
          processScannedCode(decodedText);
        },
        (errorMessage: string) => {
          // Silent failure during continuous scanning to avoid log flooding
        }
      ).catch((err: any) => {
        console.error("Camera startup failed:", err);
        showFeedback("카메라 시작 실패: 권한을 허용했는지 확인하세요.", "error");
      });
    } catch (e) {
      console.error("Failed to initialize html5-qrcode:", e);
      showFeedback("QR 라이브러리 로드 오류", "error");
    }
  }

  function processScannedCode(rawCode: string) {
    // QR 코드 인쇄 폼 등으로 인한 개행 문자(\r, \n) 및 모든 공백 문자(\s)를 제거
    let code = rawCode.replace(/[\r\n]/g, '').replace(/\s+/g, '').trim();

    // 만약 스캔된 텍스트가 전체 URL 주소 형식이라면 파라미터 값만 추출하여 정제
    if (code.includes('http://') || code.includes('https://') || code.includes('/mobile')) {
      try {
        const urlObj = new URL(code, window.location.origin);
        const locParam = urlObj.searchParams.get('loc');
        const assetParam = urlObj.searchParams.get('asset');
        
        if (locParam) code = locParam;
        else if (assetParam) code = assetParam;
      } catch (e) {
        console.error("URL 파싱 에러:", e);
      }
    }

    // 1. Check if the code is a physical location code
    if (code.startsWith('LOC-')) {
      sessionStorage.setItem(SESSION_LOC_KEY, code);
      showFeedback(`위치 [${code}] 잠금 설정 완료!`, 'success');
      updateLocationUI();
      vibrateDevice(100);
      return;
    }

    // 2. Otherwise treat it as an asset code
    const lockedLoc = sessionStorage.getItem(SESSION_LOC_KEY);
    if (!lockedLoc) {
      showFeedback('위치 QR 코드를 먼저 스캔하여 잠금을 설정해야 자산을 스캔할 수 있습니다.', 'error');
      vibrateDevice([100, 50, 100]);
      return;
    }

    // Submit matching info to server
    submitAssetAudit(code, lockedLoc);
  }

  async function submitAssetAudit(assetCode: string, locationCode: string) {
    showFeedback(`자산 ${assetCode} 전송 중...`, 'success');
    
    try {
      // Request is sent relative to host, which resolves dynamically through server proxy
      const res = await fetch('/api/audit/scan', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          asset_code: assetCode,
          physical_location_code: locationCode
        })
      });

      const data = await res.json();

      if (res.ok && data.success) {
        showFeedback(`자산 [${assetCode}] 실사 전송 성공! (관리자 승인 대기)`, 'success');
        vibrateDevice([200]);
      } else {
        showFeedback(`전송 실패: ${data.error || '알 수 없는 서버 오류'}`, 'error');
        vibrateDevice([100, 100, 100]);
      }
    } catch (err) {
      console.error("Failed to submit scan:", err);
      showFeedback('서버 전송 중 통신 네트워크 오류가 발생했습니다.', 'error');
      vibrateDevice([100, 100, 100]);
    }
  }

  function updateLocationUI() {
    const lockedLoc = sessionStorage.getItem(SESSION_LOC_KEY);
    if (lockedLoc) {
      locDisplay.textContent = lockedLoc;
      locDisplay.className = 'badge-lock';
      unlockBtn.style.display = 'inline-block';
    } else {
      locDisplay.textContent = '위치 QR 코드를 먼저 스캔하세요.';
      locDisplay.className = 'badge-empty';
      unlockBtn.style.display = 'none';
    }
  }

  function parseUrlParams() {
    const params = new URLSearchParams(window.location.search);
    const loc = params.get('loc');
    const asset = params.get('asset');

    if (loc) {
      processScannedCode(loc);
      // Clean query parameters to avoid re-triggering on page refresh
      window.history.replaceState({}, document.title, window.location.pathname);
    } else if (asset) {
      processScannedCode(asset);
      window.history.replaceState({}, document.title, window.location.pathname);
    }
  }

  function showFeedback(msg: string, type: 'success' | 'error') {
    feedbackEl.textContent = msg;
    feedbackEl.style.display = 'block';
    feedbackEl.className = `feedback-message ${type === 'success' ? 'feedback-success' : 'feedback-error'}`;
    
    // Auto-hide feedback after 4 seconds
    setTimeout(() => {
      if (feedbackEl.textContent === msg) {
        feedbackEl.style.display = 'none';
      }
    }, 4000);
  }

  function vibrateDevice(pattern: number | number[]) {
    if ('vibrate' in navigator) {
      navigator.vibrate(pattern);
    }
  }
});