esp-clock/include/mqtt.h

#pragma once

#include <AsyncMqttClient.h>
#include <ArduinoJson.h>
#include "ha.h"
#include "bme.h"
#include "display.h"

#define MQTT_HOST IPAddress(192, 168, 5, 11)
#define MQTT_PORT 1883

namespace Mqtt {

    void publishInit();
    void publishBme280();
    void connect();
    void disconnect();
    Task tReConnect(5 * TASK_MINUTE, TASK_FOREVER, connect, &ts);
    Task tPublishInit(TASK_IMMEDIATE, TASK_ONCE, publishInit, &ts);

    AsyncMqttClient client;

    const char* espClockTopic = "homeassistant/+/esp_clock/#";

    void connect() {
        client.connect();
    }

    void disconnect() {
        client.unsubscribe(espClockTopic);
        client.disconnect();
    }

    uint16_t publish(const char* topic, const char* message) {
        return client.publish(topic, 0, true, message);
    }

    Ha::Sensor* sensors[] = {
        new Ha::TemperatureSensor{"Temperature", "temperature"},
        new Ha::HumiditySensor{"Humidity", "humidity"},
        new Ha::PressureSensor{"Pressure", "pressure"},
        new Ha::AltitudeSensor{"Altitude", "altitude"}
    };

    Ha::Command* ledMqtt = (new Ha::Switch{"Led", "led",
            [](const char* msg) {
                String{ "ON" }.equals(msg) ? digitalWrite(LED_BUILTIN, LOW) : digitalWrite(LED_BUILTIN, HIGH);
            },
            []() {
                publish(ledMqtt->stateTopic, digitalRead(LED_BUILTIN) ? "OFF" : "ON");
            }
        })->withStateTopic();

    Ha::Command* brightnessMqtt = (new Ha::Brightness{ "Brightness", "brightness",
            [](const char* msg) {
                Display::Brightness::set(String{ msg }.toInt());
            },
            []() {
                char message[32];
                sprintf(message, "%u", Display::Brightness::current);
                publish(brightnessMqtt->stateTopic, message);
            }
        })->withStateTopic();
    
    Ha::Command* hourFormatMqtt = (new Ha::Switch{"Format 24h", "format_24h",
            [](const char* msg) {
                String{ "ON" }.equals(msg) ? Display::changeHourFormat24(true) : Display::changeHourFormat24(false);
            },
            []() {
                publish(hourFormatMqtt->stateTopic, Display::hourFormat24 ? "ON" : "OFF");
            }
        })->withStateTopic();

    Ha::Command* switches[] = {
        new Ha::Button{"Restart", "restart",
            [](const char* msg) {
                if (String { "PRESS" }.equals(msg)) ESP.restart();
            }
        },
        new Ha::Button{"Display sensor data", "display_sensor_data",
            [](const char* msg) {
                if (String { "PRESS" }.equals(msg) && !Display::tDisplaySensor.isEnabled()) {
                    Bme::data.readAll();
                    Display::tDisplaySensor.restart();
                };
            }
        },
        ledMqtt,
        hourFormatMqtt,
        brightnessMqtt
    };

    void publishComponentConfig(Ha::Component& component) {
        StaticJsonDocument<JSON_SIZE> jsonDoc;
        component.buildConfig(jsonDoc);

        char message[JSON_SIZE];
        serializeJson(jsonDoc, message);

        publish(component.configTopic, message);
    }

    void publishInit() {
        for (Ha::Component* cmp : sensors) {
            publishComponentConfig(*cmp);
        }
        for (Ha::Component* cmp : switches) {
            publishComponentConfig(*cmp);
        }
        ts.deleteTask(tPublishInit);
    }

    void publishBme280() {
        StaticJsonDocument<255> jsonDoc;
        jsonDoc["temperature"] = Bme::data.temp;
        jsonDoc["humidity"] = Bme::data.humidity;
        jsonDoc["pressure"] = Bme::data.pressure;
        jsonDoc["altitude"] = Bme::data.altitude;
        char message[255];
        serializeJson(jsonDoc, message);
        publish(Ha::Sensor::stateTopic, message);
    }

    void onMessage(char* topic, char* payload, AsyncMqttClientMessageProperties properties, size_t len, size_t index, size_t total) {
        char msg[len + 1];
        memcpy(msg, payload, len);
        msg[len] = 0;
        for (Ha::Command* cmd : switches) {
            if (String{ cmd->commandTopic }.equals(topic)) {
                cmd->f(msg);
                return;
            }
        }
    }

    void setup() {
        Display::Brightness::onChanged(brightnessMqtt->publishState);
        Display::onHourFormatChanged(hourFormatMqtt->publishState);
        client.onConnect([](bool sessionPresent) {
            tPublishInit.enable();
            client.subscribe(espClockTopic, 0);
            tReConnect.disable();
            Serial.println("Connected to MQTT");
            });
        client.onDisconnect([](AsyncMqttClientDisconnectReason reason) {
            tReConnect.enableDelayed();
            Serial.println("Disconnected from MQTT");
            });
        client.onMessage(onMessage);
        client.setServer(MQTT_HOST, MQTT_PORT);
        Serial.println("Connecting to MQTT...");
    }
}