const video = document.getElementById("video");
const canvas = document.getElementById("canvas");
const output = document.getElementById("output");
let currentFacingMode = "environment"; // Default to back-facing camera
let stream = null;

async function startCamera() {
    try {
        // Stop any existing stream
        if (stream) {
            stream.getTracks().forEach((track) => track.stop());
        }

        const constraints = {
            video: {
                facingMode: currentFacingMode,
                width: { ideal: 1280 },
                height: { ideal: 720 },
            },
        };

        stream = await navigator.mediaDevices.getUserMedia(constraints);
        video.srcObject = stream;
        video.play();
        console.log("Camera started successfully.");
    } catch (err) {
        console.error("Error accessing the camera:", err);
        if (err.name === "NotAllowedError") {
            alert("Camera access denied. Please allow camera permissions.");
        } else if (err.name === "NotFoundError") {
            alert("No camera found. Please connect a camera.");
        } else {
            alert("An unexpected error occurred while accessing the camera.");
        }
    }
}

document.getElementById("flipCamera").addEventListener("click", () => {
    currentFacingMode = currentFacingMode === "user" ? "environment" : "user";
    startCamera();
});

document.getElementById("capture").addEventListener("click", () => {
    if (!video.srcObject) {
        alert("Camera is not active. Please check your permissions or reload the page.");
        console.error("Camera feed not available.");
        return;
    }

    const context = canvas.getContext("2d");
    canvas.width = video.videoWidth;
    canvas.height = video.videoHeight;
    context.drawImage(video, 0, 0, canvas.width, canvas.height);

    canvas.toBlob((blob) => {
        output.textContent = "Image captured. Ready for further processing.";
        console.log("Image captured successfully.");
    }, "image/png");
});

startCamera();