rc-gateway/gateway/include/ha.h

#pragma once

#include <ArduinoJson.h>
#include "utils.h"

#define JSON_SIZE   512
#define TOPIC_SIZE  255

namespace Ha {
    uint16_t (*publisher)(const char* topic, const char* message);

    struct DeviceConfig {
        const char* id;
        const char* name;
        const char* model;
        const char* manufacturer;
        const char* area;
        DeviceConfig* parent = nullptr;

        DeviceConfig(const char* id, const char* name) : id(id), name(name) {}

        void buildConfig(JsonDocument& jsonDoc) {
            JsonObject device = jsonDoc.createNestedObject("device");
            device["name"] = name;
            // JsonArray connections = device.createNestedArray("connections");
            // JsonArray mac = connections.createNestedArray();
            // mac.add("mac");
            // mac.add(WiFi.macAddress());
            JsonArray identifiers = device.createNestedArray("identifiers");
            identifiers.add(id);
            if (model) device["model"] = model;
            if (manufacturer) device["manufacturer"] = manufacturer;
            if (area) device["suggested_area"] = area;
            if (parent) device["via_device"] = parent->id;
        }

        DeviceConfig* withModel(const char* value) {
            model = value;
            return this;
        }

        DeviceConfig* withManufacturer(const char* value) {
            manufacturer = value;
            return this;
        }

        DeviceConfig* withArea(const char* value) {
            area = value;
            return this;
        }

        DeviceConfig* withParent(DeviceConfig* deviceConfig) {
            parent = deviceConfig;
            return this;
        }
    };

    struct Component {
        const char* name;
        char* id;
        const char* type;
        char configTopic[TOPIC_SIZE];
        DeviceConfig* mainDevice;
        static List<Component> components;

        Component(const char* name, const char* id, const char* type) : name(name), id((char*)id), type(type) {
            sprintf(configTopic, "homeassistant/%s/%s/%s/config", type, MAIN_DEVICE_ID, id);
            components.add(this);
        }

        virtual void buildUniqueId(char* uniqueId) = 0;

        virtual void buildConfig(JsonDocument& jsonDoc) {
            if (mainDevice) mainDevice->buildConfig(jsonDoc);
            jsonDoc["name"] = name;
            char uniqueId[50];
            buildUniqueId(uniqueId);
            jsonDoc["unique_id"] = uniqueId;
        }
    };

    template <class T>
    struct EntityConfig : Component {

        EntityConfig(const char* name, const char* id, const char* type) : Component(name, id, type) {
        }

        T* withArea(const char* value) {
            if (mainDevice) mainDevice->withArea(value);
            return static_cast<T*>(this);
        }

        T* asDevice(DeviceConfig* deviceConfig) {
            mainDevice = deviceConfig;
            return static_cast<T*>(this);
        }
    };
    
    List<Component> Component::components;

    template <class T>
    struct Command : EntityConfig<T> {
        char commandTopic[TOPIC_SIZE];

        Command(const char* name, const char* id, const char* type) : EntityConfig<T>(name, id, type) {
        }

        void buildUniqueId(char* uniqueId) override {
            sprintf(uniqueId, "%s_%s", MAIN_DEVICE_ID, this->id);
        }

        void buildConfig(JsonDocument& jsonDoc) override {
            EntityConfig<T>::buildConfig(jsonDoc);
            jsonDoc["command_topic"] = commandTopic;
        }

    };

    typedef void (*onMessage)(const char* msg);
    struct Button : Command<Button> {
        static constexpr const char* type = "button";
        onMessage f;

        Button(const char* name, const char* id, onMessage f) : Command(name, id, type), f(f) {}

    };

    template <class T>
    struct StateConfig {
        char stateTopic[TOPIC_SIZE];

        T* withStateTopic() {
            sprintf(stateTopic, "homeassistant/%s/%s/%s/state", ((T*)this)->type, MAIN_DEVICE_ID, ((T*)this)->id);
            return static_cast<T*>(this);
        }
    };

    struct Switch : Command<Switch>, StateConfig<Switch> {
        static constexpr const char* type = "switch";
        const char* area;

        virtual void onCommand(const char* msg){}
        virtual void addToMap(){}

        Switch(const char* name, const char* id) : Command(name, id, type) {
            sprintf(commandTopic, "homeassistant/%s/%s/%s/set", type, MAIN_DEVICE_ID, id);
        }

        void buildConfig(JsonDocument& jsonDoc) override {
            Command::buildConfig(jsonDoc);
            jsonDoc["name"] = nullptr;
            jsonDoc["device_class"] = "outlet";
            jsonDoc["retain"] = true;
            if (stateTopic[0]) jsonDoc["state_topic"] = stateTopic;
        }

        void publishState(bool state) {
            publisher(stateTopic, state ? "ON" : "OFF");
        }
    };

    struct Sensor : EntityConfig<Sensor> {
        const char* deviceClass;
        const char* unitMeasure;
        const char* valueTemplate;
        static constexpr const char* stateTopic = "homeassistant/sensor/rc-gateway/state";

        Sensor(const char* name, const char* id) : EntityConfig(name, id, "sensor") {
        }

        void buildUniqueId(char* uniqueId) override {
            sprintf(uniqueId, "id%s", id);
        }

        void buildConfig(JsonDocument& jsonDoc) override {
            EntityConfig::buildConfig(jsonDoc);
            jsonDoc["device_class"] = deviceClass;
            jsonDoc["unit_of_measurement"] = unitMeasure;
            jsonDoc["value_template"] = valueTemplate;
            jsonDoc["state_topic"] = stateTopic;
        }

    };

    struct TemperatureSensor : Sensor {
        TemperatureSensor(const char* name, const char* id) : Sensor(name, id) {
            deviceClass = "temperature";
            unitMeasure = "°C";
            valueTemplate = "{{ value_json.sensor.temperature }}";
        }
    };

    struct HumiditySensor : Sensor {
        HumiditySensor(const char* name, const char* id) : Sensor(name, id) {
            deviceClass = "humidity";
            unitMeasure = "%";
            valueTemplate = "{{ value_json.sensor.humidity }}";
        }
    };

    struct PressureSensor : Sensor {
        PressureSensor(const char* name, const char* id) : Sensor(name, id) {
            deviceClass = "pressure";
            unitMeasure = "hPa";
            valueTemplate = "{{ value_json.sensor.pressure }}";
        }
    };

    struct AltitudeSensor : Sensor {
        AltitudeSensor(const char* name, const char* id) : Sensor(name, id) {
            deviceClass = "distance";
            unitMeasure = "m";
            valueTemplate = "{{ value_json.sensor.altitude }}";
        }
    };
}