esp-clock/include/ha.h

#pragma once

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

#define JSON_SIZE   512
#define TOPIC_SIZE  255

namespace Ha {

    struct Component {
        const char* name;
        const char* id;
        const char* type;
        char configTopic[TOPIC_SIZE];

        Component(const char* name, const char* id, const char* type) {
            this->name = name;
            this->id = id;
            this->type = type;
            sprintf(configTopic, "homeassistant/%s/esp_clock/%s/config", type, id);
        }

        virtual void buildUniqueId(char* uniqueId) = 0;

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

        virtual void buildDeviceConfig(JsonDocument& jsonDoc) {
            JsonObject device = jsonDoc.createNestedObject("device");
            device["name"] = "ESP Clock";
            device["model"] = "Esp8266 D1 Mini";
            device["manufacturer"] = "Espressif";
            device["suggested_area"] = "Living room";
            JsonArray connections = device.createNestedArray("connections");
            JsonArray mac = connections.createNestedArray();
            mac.add("mac");
            mac.add(WiFi.macAddress());
            JsonArray identifiers = device.createNestedArray("identifiers");
            identifiers.add("esp-clock");
        }
    };

    typedef void (*onMessage)(const char* msg);
    struct Command : Component {
        char commandTopic[TOPIC_SIZE];
        char stateTopic[TOPIC_SIZE];
        onMessage f;
        void (*publishState)();

        Command(const char* name, const char* id, const char* type, onMessage f, void (*publishState)() = nullptr) : Component(name, id, type) {
            this->f = f;
            this->publishState = publishState;
        }

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

        void buildConfig(JsonDocument& jsonDoc) override {
            Component::buildConfig(jsonDoc);
            jsonDoc["command_topic"] = commandTopic;
            if (stateTopic[0]) jsonDoc["state_topic"] = stateTopic;
        }

        Command* withStateTopic() {
            sprintf(stateTopic, "homeassistant/%s/esp_clock/%s/state", type, id);
            return this;
        }

    };

    struct Button : Command {
        static constexpr const char* type = "button";

        Button(const char* name, const char* id, onMessage f) : Command(name, id, type, f) {
            sprintf(commandTopic, "homeassistant/%s/esp_clock/%s", type, id);
        }

    };

    struct Switch : Command {
        static constexpr const char* type = "switch";

        Switch(const char* name, const char* id, onMessage f, void (*publishState)()) : Command(name, id, type, f, publishState) {
            sprintf(commandTopic, "homeassistant/%s/esp_clock/%s/set", type, id);
        }

        void buildConfig(JsonDocument& jsonDoc) override {
            Command::buildConfig(jsonDoc);
            jsonDoc["retain"] = true;
        }

    };

    struct Brightness : Command {
        static constexpr const char* type = "number";

        Brightness(const char* name, const char* id, onMessage f, void (*publishState)()) : Command(name, id, type, f, publishState) {
            sprintf(commandTopic, "homeassistant/%s/esp_clock/%s", type, id);
        }

        void buildConfig(JsonDocument& jsonDoc) override {
            Command::buildConfig(jsonDoc);
            jsonDoc["retain"] = true;
            jsonDoc["min"] = BRIGHTNESS_MIN;
            jsonDoc["max"] = BRIGHTNESS_MAX;
            jsonDoc["step"] = BRIGHTNESS_STEP;
        }

    };

    struct Sensor : Component {
        const char* deviceClass;
        const char* unitMeasure;
        const char* valueTemplate;
        static constexpr const char* stateTopic = "homeassistant/sensor/esp_clock/state";

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

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

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

        void buildDeviceConfig(JsonDocument& jsonDoc) override {
            JsonObject device = jsonDoc.createNestedObject("device");
            device["name"] = "Living room";
            device["model"] = "BPM280";
            device["suggested_area"] = "Living room";
            device["via_device"] = "esp-clock";
            JsonArray identifiers = device.createNestedArray("identifiers");
            identifiers.add("esp-clock-living-room");
        }

    };

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

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

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

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