"use client";
import { useState, useRef } from "react";

export default function SimpleQRScanner({ onScan }) {
  const [error, setError] = useState(null);
  const [isCameraActive, setIsCameraActive] = useState(false);
  const videoRef = useRef(null);

  const startCamera = async () => {
    try {
      const stream = await navigator.mediaDevices.getUserMedia({
        video: { facingMode: "environment" },
      });

      if (videoRef.current) {
        videoRef.current.srcObject = stream;
        setIsCameraActive(true);
      }
    } catch (err) {
      console.error("Error accessing camera:", err);
      setError(
        "Could not access camera. Please make sure you've given camera permission."
      );
    }
  };

  const stopCamera = () => {
    if (videoRef.current && videoRef.current.srcObject) {
      const tracks = videoRef.current.srcObject.getTracks();
      tracks.forEach((track) => track.stop());
      videoRef.current.srcObject = null;
      setIsCameraActive(false);
    }
  };

  const handleManualInput = () => {
    const code = prompt("Enter the QR code value manually (e.g. QR123):");
    if (code && onScan) {
      onScan(code);
    }
  };

  return (
    <div className="simple-scanner">
      {error && <div className="scanner-error">{error}</div>}

      {!isCameraActive ? (
        <div className="scanner-controls">
          <button className="scanner-button" onClick={startCamera}>
            Open Camera to Scan QR Code
          </button>
          <button
            className="scanner-button secondary"
            onClick={handleManualInput}
          >
            Enter Code Manually
          </button>
        </div>
      ) : (
        <div className="video-container">
          <video
            ref={videoRef}
            autoPlay
            playsInline
            onCanPlay={() => videoRef.current.play()}
          />
          <div className="scanner-overlay">
            <div className="scanner-target"></div>
          </div>
          <button className="close-camera-button" onClick={stopCamera}>
            Close Camera
          </button>
        </div>
      )}

      <style jsx>{`
        .simple-scanner {
          display: flex;
          flex-direction: column;
          align-items: center;
          width: 100%;
        }

        .scanner-error {
          color: red;
          margin-bottom: 15px;
          text-align: center;
          padding: 8px;
          background-color: #ffebee;
          border-radius: 4px;
          width: 100%;
        }

        .scanner-controls {
          display: flex;
          flex-direction: column;
          gap: 10px;
          width: 100%;
        }

        .scanner-button {
          padding: 12px;
          background-color: #68543c;
          color: white;
          border: none;
          border-radius: 6px;
          font-weight: bold;
          cursor: pointer;
        }

        .scanner-button.secondary {
          background-color: #999;
        }

        .video-container {
          position: relative;
          width: 300px;
          height: 300px;
          overflow: hidden;
          border-radius: 8px;
          border: 2px solid #ddd;
        }

        video {
          width: 100%;
          height: 100%;
          object-fit: cover;
        }

        .scanner-overlay {
          position: absolute;
          top: 0;
          left: 0;
          right: 0;
          bottom: 0;
          display: flex;
          justify-content: center;
          align-items: center;
          background-color: rgba(0, 0, 0, 0.2);
        }

        .scanner-target {
          width: 200px;
          height: 200px;
          border: 2px solid #fff;
          border-radius: 8px;
          box-shadow: 0 0 0 4000px rgba(0, 0, 0, 0.3);
        }

        .close-camera-button {
          position: absolute;
          bottom: 10px;
          right: 10px;
          background-color: rgba(0, 0, 0, 0.5);
          color: white;
          border: none;
          border-radius: 4px;
          padding: 5px 10px;
          cursor: pointer;
        }
      `}</style>
    </div>
  );
}