#include "HADiscovery.h"
#include <sstream>

HADiscovery::HADiscovery(const char *topic_prefix, std::function<void(const char*, const char*)> publish_callback) : topic_prefix(topic_prefix), publish_callback(publish_callback)
{
}

void HADiscovery::publish(const Shade &shade)
{
    publishCoverDiscoveryTopic(shade);
    publishBatteryDiscoveryTopic(shade);
    publishRefreshButtonDiscoveryTopic(shade);
}

void HADiscovery::addDeviceObject(JsonDocument &doc, const Shade &shade)
{
    std::stringstream ss;
    ss << "hotdog-" << std::hex << shade.ID;
    std::string deviceID = ss.str();

    JsonObject device = doc["device"].to<JsonObject>();
    device["name"] = shade.friendlyName;
    JsonArray identifiers = device["identifiers"].to<JsonArray>();
    identifiers.add(deviceID);
    device["manufacturer"] = "Hunter Douglas";
    // TODO: Add fields like sw_version and model
}

void HADiscovery::publishCoverDiscoveryTopic(const Shade &shade)
{
    std::stringstream ss;
    ss << std::hex << shade.ID;
    std::string objectID = ss.str();

    std::string entityID = "cover-" + objectID;

    JsonDocument doc;

    doc["name"] = nullptr;
    doc["unique_id"] = entityID;
    doc["availability_topic"] = std::string(topic_prefix) + "availability";
    doc["state_topic"] = std::string(topic_prefix) + shade.key + "/state";
    doc["command_topic"] = std::string(topic_prefix) + shade.key + "/command";
    doc["position_topic"] = std::string(topic_prefix) + shade.key + "/position";
    doc["set_position_topic"] = std::string(topic_prefix) + shade.key + "/set_position";
    doc["position_open"] = 100;
    doc["position_closed"] = 0;
    doc["optimistic"] = false;

    addDeviceObject(doc, shade);

    serializeJson(doc, jsonBuffer);

    publish_callback(("homeassistant/cover/" + objectID + "/config").c_str(), jsonBuffer);
}

void HADiscovery::publishBatteryDiscoveryTopic(const Shade &shade)
{
    std::stringstream ss;
    ss << std::hex << shade.ID;
    std::string objectID = ss.str();

    std::string entityID = "battery-" + objectID;

    JsonDocument doc;

    doc["name"] = "Battery";
    doc["unique_id"] = entityID;
    doc["availability_topic"] = std::string(topic_prefix) + "availability";
    doc["device_class"] = "battery";
    doc["state_topic"] = std::string(topic_prefix) + shade.key + "/battery";

    addDeviceObject(doc, shade);

    serializeJson(doc, jsonBuffer);

    publish_callback(("homeassistant/sensor/" + objectID + "/config").c_str(), jsonBuffer);
}

void HADiscovery::publishRefreshButtonDiscoveryTopic(const Shade &shade)
{
    std::stringstream ss;
    ss << std::hex << shade.ID;
    std::string objectID = ss.str();

    std::string entityID = "refresh-button-" + objectID;

    JsonDocument doc;

    doc["name"] = "Refresh";
    doc["unique_id"] = entityID;
    doc["availability_topic"] = std::string(topic_prefix) + "availability";
    doc["command_topic"] = std::string(topic_prefix) + shade.key + "/command";
    doc["payload_press"] = "REFRESH";

    addDeviceObject(doc, shade);

    serializeJson(doc, jsonBuffer);

    publish_callback(("homeassistant/button/" + objectID + "/config").c_str(), jsonBuffer);
}