#pragma once

#include "cvmmap_streamer/config/runtime_config.hpp"
#include "cvmmap_streamer/encode/encoded_access_unit.hpp"
#include "cvmmap_streamer/ipc/contracts.hpp"

#include <cstdint>
#include <expected>
#include <memory>
#include <span>
#include <string>
#include <string_view>
#include <vector>

namespace cvmmap_streamer::encode {

struct RawVideoFrame {
	ipc::FrameInfo info{};
	std::uint64_t source_timestamp_ns{0};
	std::span<const std::uint8_t> bytes{};
};

class EncoderBackend {
public:
	virtual ~EncoderBackend() = default;

	[[nodiscard]]
	virtual std::string_view backend_name() const = 0;

	[[nodiscard]]
	virtual bool using_hardware() const = 0;

	[[nodiscard]]
	virtual std::expected<void, std::string> init(const RuntimeConfig &config, const ipc::FrameInfo &frame_info) = 0;

	[[nodiscard]]
	virtual std::expected<void, std::string> poll() = 0;

	[[nodiscard]]
	virtual std::expected<void, std::string> push_frame(const RawVideoFrame &frame) = 0;

	[[nodiscard]]
	virtual std::expected<std::vector<EncodedAccessUnit>, std::string> drain() = 0;

	[[nodiscard]]
	virtual std::expected<std::vector<EncodedAccessUnit>, std::string> flush() = 0;

	virtual void shutdown() = 0;
};

[[nodiscard]]
std::expected<std::unique_ptr<EncoderBackend>, std::string> make_encoder_backend(const RuntimeConfig &config);

}