// =====================================================================
// ZoneManager.h
//
// Rectangular detection-zone logic, ported from the ESP32-LD2450
// project's main_zone.cpp. Works entirely on RadarTarget X/Y values,
// so it is unaffected by however LD2453Parser ends up decoding raw
// frames — nothing here needs to change once the parser is confirmed.
// =====================================================================
#pragma once

#include <Arduino.h>
#include "LD2453Parser.h"

static const uint8_t MAX_ZONES = 3;

struct Zone {
    int x1, y1, x2, y2; // millimeters, same coordinate system as RadarTarget
};

class ZoneManager {
public:
    ZoneManager();

    // Re-evaluate occupancy for all zones against the targets in
    // `frame`. Call this once per new radar frame.
    void update(const RadarFrame &frame);

    bool isZoneOccupied(uint8_t zoneIndex) const;
    Zone getZone(uint8_t zoneIndex) const;
    void setZone(uint8_t zoneIndex, const Zone &zone);

    // Serialize current zone definitions to JSON, e.g. for GET /zones.
    // Returns the JSON string.
    String zonesToJson() const;

    // Parse a JSON body (as sent by POST /updateZones) and update
    // zones in place. Missing fields keep their previous value.
    // Returns false on JSON parse failure.
    bool zonesFromJson(const uint8_t *data, size_t len);

private:
    Zone _zones[MAX_ZONES];
    bool _occupied[MAX_ZONES];

    static bool pointInZone(int x, int y, const Zone &z);
};