#include "video_pipeline.hpp"

#include <chrono>

VideoPipeline::VideoPipeline() : running_(false) {}

VideoPipeline::~VideoPipeline() {
	Stop();
}

void VideoPipeline::Start(const std::string& inputUrl, const std::string& outputUrl) {
	if (running_)
		return;
	running_ = true;
	spdlog::info("Starting VideoPipeline with Input: {}", inputUrl);

	processingThread_ = std::thread(&VideoPipeline::processLoop, this, inputUrl, outputUrl, false);
}

void VideoPipeline::StartTest(const std::string& filePath, const std::string& outputUrl) {
	if (running_)
		return;
	running_ = true;
	spdlog::info("Starting VideoPipeline (File Test Mode) Input: {}", filePath);

	// true 表示是文件源
	processingThread_ = std::thread(&VideoPipeline::processLoop, this, filePath, outputUrl, true);
}

void VideoPipeline::Stop() {
	if (!running_)
		return;
	running_ = false;
	if (processingThread_.joinable()) {
		processingThread_.join();
	}
	spdlog::info("VideoPipeline Stopped.");
}

std::vector<DetectionResult> VideoPipeline::mockInference(const cv::Mat& frame) {
	std::vector<DetectionResult> results;
	static int dummyX = 100;
	static int direction = 5;

	// 简单的移动逻辑，模拟每帧的变化
	dummyX += direction;
	if (dummyX > frame.cols - 200 || dummyX < 0)
		direction *= -1;

	DetectionResult res;
	res.x = dummyX;
	res.y = 200;
	res.width = 150;
	res.height = 300;
	res.label = "TEST_CLIP";
	res.confidence = 0.95f;

	results.push_back(res);
	return results;
}

void VideoPipeline::drawOverlay(cv::Mat& frame, const std::vector<DetectionResult>& results) {
	for (const auto& res : results) {
		cv::rectangle(frame, cv::Rect(res.x, res.y, res.width, res.height), cv::Scalar(0, 255, 0),
					  2);
		std::string text = res.label + " " + std::to_string(res.confidence).substr(0, 4);
		cv::putText(frame, text, cv::Point(res.x, res.y - 5), cv::FONT_HERSHEY_SIMPLEX, 0.6,
					cv::Scalar(0, 255, 0), 2);
	}
	cv::putText(frame, "RK3588 H.264 @ 20FPS", cv::Point(20, 50), cv::FONT_HERSHEY_SIMPLEX, 1.0,
				cv::Scalar(0, 0, 255), 2);
}

void VideoPipeline::processLoop(std::string inputUrl, std::string outputUrl, bool isFileSource) {
	cv::VideoCapture cap;
	cap.open(inputUrl);	 // 文件路径也是通过 open 打开

	if (!cap.isOpened()) {
		spdlog::error("Failed to open input: {}", inputUrl);
		running_ = false;
		return;
	}

	const double TARGET_FPS = 20.0;
	// 计算每帧的目标耗时 (毫秒) -> 1000 / 20 = 50ms
	const double FRAME_DURATION_MS = 1000.0 / TARGET_FPS;

	int width = cap.get(cv::CAP_PROP_FRAME_WIDTH);
	int height = cap.get(cv::CAP_PROP_FRAME_HEIGHT);

	spdlog::info("Source: {}x{} | Mode: {}", width, height,
				 isFileSource ? "FILE LOOP" : "LIVE STREAM");

	std::stringstream pipeline;
	pipeline << "appsrc ! "
			 << "videoconvert ! "
			 << "video/x-raw,format=NV12,width=" << width << ",height=" << height
			 << ",framerate=20/1 ! "
			 << "mpph264enc ! "
			 << "h264parse ! "
			 << "rtspclientsink location=" << outputUrl << " protocols=tcp";

	cv::VideoWriter writer;
	writer.open(pipeline.str(), cv::CAP_GSTREAMER, 0, TARGET_FPS, cv::Size(width, height), true);

	if (!writer.isOpened()) {
		spdlog::error("Failed to initialize VideoWriter.");
	}

	cv::Mat frame;

	while (running_) {
		// 记录循环开始时间
		auto loop_start = std::chrono::steady_clock::now();

		if (!cap.read(frame)) {
			if (isFileSource) {
				spdlog::info("End of file reached, looping...");
				cap.set(cv::CAP_PROP_POS_FRAMES, 0);
				continue;
			} else {
				spdlog::warn("Frame read failed. Reconnecting...");
				std::this_thread::sleep_for(std::chrono::seconds(1));
				cap.release();
				cap.open(inputUrl);
				continue;
			}
		}

		if (frame.empty())
			continue;

		// 1. 算法处理
		auto results = mockInference(frame);

		// 2. 绘制叠加
		drawOverlay(frame, results);

		// 3. 推流
		if (writer.isOpened()) {
			writer.write(frame);
		}

		if (isFileSource) {
			auto loop_end = std::chrono::steady_clock::now();
			std::chrono::duration<double, std::milli> elapsed = loop_end - loop_start;

			double elapsed_ms = elapsed.count();
			double wait_ms = FRAME_DURATION_MS - elapsed_ms;

			if (wait_ms > 0) {
				std::this_thread::sleep_for(std::chrono::milliseconds((int)wait_ms));
			}
		}
	}

	cap.release();
	writer.release();
}