#pragma once
#include <array>
#include <atomic>
#include <cstdint>

// Shared state between OSC thread and Writer thread.
// Per-byte atomic<uint8_t> array: worst-case small inter-byte tear between
// a single LED's R/G/B is acceptable per Phase 16 D-07 (transient artifact,
// resolves on next 11 ms tick). All stores are relaxed; no happens-before
// is required because the Writer thread treats each tick as a fresh snapshot.
class ParamMap {
public:
    // led in [0..9], channel in [0..2]  (R=0, G=1, B=2)
    void SetChannel(int led, int channel, float value01);
    void SetBrightness(float value01);
    // Copies 30 bytes into dst; worst-case small tear between bytes is acceptable per D-07.
    void SnapshotFrame(std::array<uint8_t, 30>& dst) const;
    uint8_t SnapshotBri() const;
    // Updates lastOscNs to now. Called after every valid OSC packet.
    void MarkOscArrived();
    // Returns nanoseconds since last OSC; used by silence-fade (D-15).
    int64_t NsSinceLastOsc() const;

private:
    std::array<std::atomic<uint8_t>, 30> m_rgb{};  // 10 LEDs * 3 channels
    std::atomic<uint8_t> m_bri{0};
    std::atomic<int64_t> m_lastOscNs{0};
};