/**
 * Verifica se webcam está disponível
 */
export async function validarWebcamDisponivel(): Promise<boolean> {
	if (typeof navigator === 'undefined' || !navigator.mediaDevices || !navigator.mediaDevices.getUserMedia) {
		return false;
	}

	try {
		const devices = await navigator.mediaDevices.enumerateDevices();
		return devices.some((device) => device.kind === 'videoinput');
	} catch {
		return false;
	}
}

/**
 * Captura imagem da webcam
 */
export async function capturarWebcam(): Promise<Blob | null> {
	if (typeof navigator === 'undefined' || !navigator.mediaDevices || !navigator.mediaDevices.getUserMedia) {
		return null;
	}

	let stream: MediaStream | null = null;

	try {
		// Solicitar acesso à webcam
		stream = await navigator.mediaDevices.getUserMedia({
			video: {
				width: { ideal: 1280 },
				height: { ideal: 720 },
				facingMode: 'user',
			},
		});

		// Criar elemento de vídeo temporário
		const video = document.createElement('video');
		video.srcObject = stream;
		video.play();

		// Aguardar vídeo estar pronto
		await new Promise<void>((resolve, reject) => {
			video.onloadedmetadata = () => {
				video.width = video.videoWidth;
				video.height = video.videoHeight;
				resolve();
			};
			video.onerror = reject;
			setTimeout(() => reject(new Error('Timeout ao carregar vídeo')), 5000);
		});

		// Capturar frame
		const canvas = document.createElement('canvas');
		canvas.width = video.videoWidth;
		canvas.height = video.videoHeight;
		const ctx = canvas.getContext('2d');
		if (!ctx) {
			throw new Error('Não foi possível obter contexto do canvas');
		}

		ctx.drawImage(video, 0, 0);

		// Converter para blob
		return await new Promise<Blob | null>((resolve) => {
			canvas.toBlob(
				(blob) => {
					resolve(blob);
				},
				'image/jpeg',
				0.9
			);
		});
	} catch (error) {
		console.error('Erro ao capturar webcam:', error);
		return null;
	} finally {
		// Parar stream
		if (stream) {
			stream.getTracks().forEach((track) => track.stop());
		}
	}
}

/**
 * Captura imagem da webcam com preview
 */
export async function capturarWebcamComPreview(
	videoElement: HTMLVideoElement,
	canvasElement: HTMLCanvasElement
): Promise<Blob | null> {
	if (typeof navigator === 'undefined' || !navigator.mediaDevices || !navigator.mediaDevices.getUserMedia) {
		return null;
	}

	let stream: MediaStream | null = null;

	try {
		// Solicitar acesso à webcam
		stream = await navigator.mediaDevices.getUserMedia({
			video: {
				width: { ideal: 1280 },
				height: { ideal: 720 },
				facingMode: 'user',
			},
		});

		videoElement.srcObject = stream;
		await videoElement.play();

		// Aguardar vídeo estar pronto
		await new Promise<void>((resolve, reject) => {
			videoElement.onloadedmetadata = () => {
				canvasElement.width = videoElement.videoWidth;
				canvasElement.height = videoElement.videoHeight;
				resolve();
			};
			videoElement.onerror = reject;
			setTimeout(() => reject(new Error('Timeout ao carregar vídeo')), 5000);
		});

		// Capturar frame
		const ctx = canvasElement.getContext('2d');
		if (!ctx) {
			throw new Error('Não foi possível obter contexto do canvas');
		}

		ctx.drawImage(videoElement, 0, 0);

		// Converter para blob
		return await new Promise<Blob | null>((resolve) => {
			canvasElement.toBlob(
				(blob) => {
					resolve(blob);
				},
				'image/jpeg',
				0.9
			);
		});
	} catch (error) {
		console.error('Erro ao capturar webcam:', error);
		return null;
	} finally {
		// Parar stream
		if (stream) {
			stream.getTracks().forEach((track) => track.stop());
		}
	}
}