receiver_output.h

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// SPDX-License-Identifier: GPL-2.0-only
//
// Copyright (c) 2026-present FERS Contributors (see AUTHORS.md).
//
// See the GNU GPLv2 LICENSE file in the FERS project root for more information.
 
#pragma once
 
#include <cstdint>
#include <functional>
#include <memory>
#include <optional>
#include <span>
#include <string>
#include <vector>
 
#include "core/config.h"
#include "core/output_config.h"
#include "core/sim_id.h"
#include "core/vita49_timestamp.h"
 
namespace core
{
    struct OutputFileMetadata;
 
    struct ReceiverStreamDescriptor
    {
        struct CoordinateContext
        {
            std::string frame = "ENU";
            RealType origin_latitude = 0.0;
            RealType origin_longitude = 0.0;
            RealType origin_altitude = 0.0;
            std::int32_t utm_zone = 0;
            bool utm_north_hemisphere = true;
        };
 
        struct PlatformState
        {
            SimId platform_id = 0;
            std::string platform_name = {};
            RealType position_x = 0.0;
            RealType position_y = 0.0;
            RealType position_z = 0.0;
            RealType velocity_x = 0.0;
            RealType velocity_y = 0.0;
            RealType velocity_z = 0.0;
            RealType azimuth = 0.0;
            RealType elevation = 0.0;
        };
 
        struct FmcwContext
        {
            bool present = false;
            std::string waveform_shape = {};
            RealType chirp_bandwidth = 0.0;
            RealType chirp_duration = 0.0;
            RealType chirp_period = 0.0;
            RealType chirp_rate = 0.0;
            RealType chirp_rate_signed = 0.0;
            std::string sweep_direction = {};
            RealType start_frequency_offset = 0.0;
            std::optional<RealType> triangle_period = std::nullopt;
            std::optional<std::uint64_t> chirp_count = std::nullopt;
            std::optional<std::uint64_t> triangle_count = std::nullopt;
            std::string dechirp_mode = "none";
            std::string dechirp_reference_source = "none";
            SimId dechirp_reference_transmitter_id = 0;
            std::string dechirp_reference_transmitter_name = {};
            SimId dechirp_reference_waveform_id = 0;
            std::string dechirp_reference_waveform_name = {};
        };
 
        struct PulsedContext
        {
            bool present = false;
            RealType window_length = 0.0;
            RealType window_prf = 0.0;
            RealType window_skip = 0.0;
            std::uint64_t window_count = 0;
            SimId waveform_id = 0;
            std::string waveform_name = {};
            RealType carrier_frequency = 0.0;
            RealType power = 0.0;
            RealType pulse_width = 0.0;
            RealType native_sample_rate = 0.0;
            std::uint64_t native_sample_count = 0;
        };
 
        struct CwContext
        {
            bool present = false;
            SimId waveform_id = 0;
            std::string waveform_name = {};
            RealType carrier_frequency = 0.0;
            RealType power = 0.0;
        };
 
        struct SfcwContext
        {
            bool present = false;
            SimId waveform_id = 0;
            std::string waveform_name = {};
            RealType carrier_frequency = 0.0;
            RealType power = 0.0;
            RealType start_frequency_offset = 0.0;
            RealType step_size = 0.0;
            std::uint64_t step_count = 0;
            RealType dwell_time = 0.0;
            RealType step_period = 0.0;
            RealType sweep_period = 0.0;
            std::optional<std::uint64_t> sweep_count = std::nullopt;
            RealType first_frequency = 0.0;
            RealType last_frequency = 0.0;
            RealType frequency_span = 0.0;
            RealType effective_bandwidth = 0.0;
            RealType range_resolution = 0.0;
            RealType unambiguous_range = 0.0;
        };
 
        SimId receiver_id = 0;
        std::string receiver_name = {};
        std::string mode = {};
        RealType sample_rate = 0.0;
        RealType reference_frequency = 0.0;
        RealType if_offset = 0.0;
        RealType bandwidth = 0.0;
        bool dechirped = false;
        bool if_resampled = false;
        unsigned adc_bits = 0;
        CoordinateContext coordinate = {};
        PlatformState initial_platform_state = {};
        PulsedContext pulsed = {};
        CwContext cw = {};
        FmcwContext fmcw = {};
        SfcwContext sfcw = {};
    };
 
    struct ReceiverSampleBlock
    {
        ReceiverStreamDescriptor stream;
        RealType first_sample_time = 0.0;
        RealType sample_rate = 0.0;
        std::span<const ComplexType> samples;
        std::uint64_t sample_start = 0;
        bool valid_data = true;
        bool calibrated_time = true;
        bool reference_lock = true;
        std::shared_ptr<const OutputFileMetadata> file_metadata = nullptr;
    };
 
    struct ReceiverStreamStats
    {
        SimId receiver_id = 0;
        std::string receiver_name;
        std::uint32_t stream_id = 0;
        std::string mode = "unknown";
        RealType sample_rate = 0.0;
        RealType reference_frequency = 0.0;
        std::uint64_t packets_emitted = 0;
        std::uint64_t context_packets = 0;
        std::uint64_t samples_emitted = 0;
        std::uint64_t packets_dropped = 0;
        std::uint64_t samples_dropped = 0;
        std::uint64_t over_range_count = 0;
        std::uint64_t late_packet_count = 0;
        std::optional<RealType> first_sample_time = std::nullopt;
        std::optional<RealType> end_sample_time = std::nullopt;
        std::optional<Vita49Timestamp> first_timestamp = std::nullopt;
        std::optional<Vita49Timestamp> end_timestamp = std::nullopt;
    };
 
    struct OutputStats
    {
        OutputMode mode = OutputMode::Hdf5;
        std::optional<std::uint64_t> epoch_unix_nanoseconds = std::nullopt;
        std::vector<ReceiverStreamStats> streams;
    };
 
    struct ReceiverOutputPacketTrace
    {
        std::uint64_t sequence = 0;
        std::string event;
        std::uint32_t stream_id = 0;
        std::uint64_t byte_count = 0;
        std::uint64_t sample_count = 0;
        RealType first_sample_time = 0.0;
        std::optional<Vita49Timestamp> timestamp = std::nullopt;
        bool data_packet = false;
        bool context_packet = false;
        bool dropped = false;
        bool over_range = false;
        bool sample_loss = false;
    };
 
    using ReceiverOutputTelemetryCallback =
        std::function<void(const std::optional<OutputStats>&, std::span<const ReceiverOutputPacketTrace>)>;
 
    class ReceiverOutputSink
    {
    public:
        virtual ~ReceiverOutputSink() = default;
 
        virtual void initializeRun(const OutputConfig& config, std::string simulation_name) = 0;
        virtual std::uint32_t registerStream(const ReceiverStreamDescriptor& stream) = 0;
        virtual void openStream(std::uint32_t stream_id, RealType first_sample_time) = 0;
        virtual void submitBlock(const ReceiverSampleBlock& block) = 0;
        virtual void emitContextHeartbeat(RealType simulation_time) = 0;
        virtual void closeStream(std::uint32_t stream_id) = 0;
        virtual OutputStats finalize() = 0;
        [[nodiscard]] virtual OutputStats snapshotStats() const { return {}; }
    };
}