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#ifndef _TUYABULBBACI_IMPL_H
#define _TUYABULBBACI_IMPL_H
   
#ifndef __cplusplus
#error This is a C++ include file and cannot be used from plain C
#endif
   
// Base component implementation, including container services and component lifecycle infrastructure
#include <baciCharacteristicComponentImpl.h>
#include <baciROboolean.h>
   
// Skeleton interface for server implementation
#include <TuyaBulbBaciS.h>

// Extras
#include "httplib.h"
#include "hmac_sha256.h"
#include "json.hpp"
   
// Error definitions for catching and raising exceptions
class TuyaBulbBaciImpl : public virtual baci::CharacteristicComponentImpl, public virtual POA_acsiot::TuyaBulbBaci {
    public:
        TuyaBulbBaciImpl(const ACE_CString& name, maci::ContainerServices* containerServices);
        virtual ~TuyaBulbBaciImpl();
 
        void turnOn();
        void turnOff();
        virtual ACS::ROboolean_ptr status();
 
    private:
        const std::string api_region;
        const std::string client_id;
        const std::string api_secret;
        const std::string device_id;
        const std::string base_url;
        std::string token;
        baci::ROboolean* m_status_p;

        httplib::Result sendRequest(
            const std::string uri,
            const std::string action = "GET",
            const std::map<std::string, std::string> headers_map = {},
            const std::string headers_str = "",
            const std::string body = "",
            const std::string body_sha256 = "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
            const std::string version = "v1.0"
        );
        std::string getToken();
};
   
#endif

#define CPPHTTPLIB_OPENSSL_SUPPORT
#include <TuyaBulbBaciImpl.h>
 
#include <stdexcept>

// Extras
#define SHA256_HASH_SIZE 32
using json = nlohmann::json;

   
TuyaBulbBaciImpl::TuyaBulbBaciImpl(const ACE_CString& name, maci::ContainerServices* containerServices) : CharacteristicComponentImpl(name, containerServices),
    api_region("us"),
    client_id("..."),
    api_secret("..."),
    device_id("..."),
    base_url("https://openapi.tuyaus.com"),
    m_status_p(0)
{
    std::cout << "Constructing TuyaBulbBaciImpl object." << std::endl;
    token = getToken();
    m_status_p  = new baci::ROboolean(name + ":status", getComponent());
    CHARACTERISTIC_COMPONENT_PROPERTY(status, m_status_p);
    // std::cout << "API Region: " << this->api_region << std::endl;
    // std::cout << "Client ID: " << this->client_id << std::endl;
    // std::cout << "API Secret: " << this->api_secret << std::endl;
    // std::cout << "Device ID: " << this->device_id << std::endl;
    // std::cout << "API Token: " << this->token << std::endl;
}
   
TuyaBulbBaciImpl::~TuyaBulbBaciImpl() {
	if (m_status_p != 0) {
		m_status_p->destroy();
		m_status_p=0;
	}
}
 
void TuyaBulbBaciImpl::turnOn() {
    std::cout << "Turning smart bulb ON..." << std::endl;

    // Set request parameters
    const std::string uri = "/iot-03/devices/" + this->device_id + "/commands";
    const std::string action = "POST";
    const std::string headers_str = "";
    const std::string body = "{\"commands\":[{\"code\":\"switch_led\",\"value\":true}]}";
    const std::string body_sha256 = "8479c9c60cd5d531054c49333c7b361a9ce41b9b313ab8eb6bc9df4141f658ef";
    std::map<std::string, std::string> headers_map;
    headers_map = {
        {"Content-type", "application/json"},
        {"access_token", this->token}
    };

    // Send request and print response
    httplib::Result response = this->sendRequest(uri, action, headers_map, headers_str, body, body_sha256);
    std::cout << "Response status:\n";
    std::cout << response->status << std::endl;
    std::cout << "Response body:\n";
    std::cout << response->body << std::endl;

    // Check API response
    if (response->status == 200) {
        json body = json::parse(response->body);
        if (body["success"].dump() == "true") {
            m_status_p = new baci::ROboolean(true);
        } else {
            throw std::runtime_error("Error while turning smart bulb ON.\n");
        }
    }
}
 
void TuyaBulbBaciImpl::turnOff() {
    std::cout << "Turning smart bulb OFF..." << std::endl;

    // Set request parameters
    const std::string uri = "/iot-03/devices/" + this->device_id + "/commands";
    const std::string action = "POST";
    const std::string headers_str = "";
    const std::string body = "{\"commands\":[{\"code\":\"switch_led\",\"value\":false}]}";
    const std::string body_sha256 = "c9df53ad98d9c9be68680613d9ece634a27f102c5e40c7b5f60c11f6b944b6a9";
    std::map<std::string, std::string> headers_map;
    headers_map = {
        {"Content-type", "application/json"},
        {"access_token", this->token}
    };

    // Send request and print response
    httplib::Result response = this->sendRequest(uri, action, headers_map, headers_str, body, body_sha256);
    std::cout << "Response status:\n";
    std::cout << response->status << std::endl;
    std::cout << "Response body:\n";
    std::cout << response->body << std::endl;

    // Check API response
    if (response->status == 200) {
        json body = json::parse(response->body);
        if (body["success"].dump() == "true") {
            m_status_p = new baci::ROboolean(false);
        } else {
            throw std::runtime_error("Error while turning smart bulb OFF.\n");
        }
    }
}

httplib::Result TuyaBulbBaciImpl::sendRequest(
        const std::string uri,
        const std::string action,
        const std::map<std::string, std::string> headers_map,
        const std::string headers_str,
        const std::string body,
        const std::string body_sha256,
        const std::string version
    ) {
    // https://developer.tuya.com/en/docs/iot/api-request?id=Ka4a8uuo1j4t4
    // https://developer.tuya.com/en/docs/iot/singnature?id=Ka43a5mtx1gsc
    std::cout << "Sending request to Tuya API " << uri << std::endl;

    // String stringToSign = 
    // HTTPMethod + "\n" + 
    // Content-SHA256 + "\n" +
    // Headers + "\n" +
    // Url
    const std::string url = "/" + version + uri;
    const std::string string_to_sign = action + "\n" + body_sha256 + "\n" + headers_str + "\n" + url;

    // Get time in milliseconds since epoch, with 13 digits
    std::time_t t = std::time(nullptr) * 1000;

    // str = client_id + access_token + t + nonce + stringToSign 
    // sign = HMAC-SHA256(str, secret).toUpperCase()
    std::string str_data;
    if (this->token.empty()) {
        str_data = this->client_id + std::to_string(t) + string_to_sign;
    } else {
        str_data = this->client_id + this->token + std::to_string(t) + string_to_sign;
    }

    // Allocate memory for the HMAC
    std::vector<uint8_t> out(SHA256_HASH_SIZE);

    // Call hmac-sha256 function and parse result to string stream
    hmac_sha256(this->api_secret.data(), this->api_secret.size(), str_data.data(), str_data.size(),
                out.data(), out.size());
    
    std::stringstream ss_result;
    for (uint8_t i : out) {
        ss_result << std::hex << std::setfill('0') << std::setw(2) << (int)i;
    }

    // to uppercase
    std::string sign = ss_result.str();
    transform(sign.begin(), sign.end(), sign.begin(), ::toupper);

    // Create base headers
    httplib::Headers request_headers = {
        { "client_id", this->client_id },
        { "sign_method", "HMAC-SHA256" },
        { "sign", sign },
        { "t", std::to_string(t) }
    };

    // Add extra headers
    std::map<std::string, std::string>::const_iterator it;
    for (it = headers_map.begin(); it != headers_map.end(); it++) {        
        request_headers.insert({ it->first, it->second });
    }

    // Create HTTPS client
    httplib::Client cli(this->base_url);

    // Send request
    if (action.compare("GET") == 0) {
        return cli.Get(url.c_str(), request_headers);
    } else {
        return cli.Post(url.c_str(), request_headers, body.c_str(), "application/json");
    }
}

std::string TuyaBulbBaciImpl::getToken() {
    // https://openapi.tuyaus.com/v1.0/token?grant_type=1
    const std::string uri = "/token?grant_type=1";
    httplib::Result response = this->sendRequest(uri);

    // Check API response
    if (response->status == 200) {
        json body = json::parse(response->body);
        
        if (body["success"].dump() == "true") {
            const std::string token = body["result"]["access_token"];
            return token;
        }
    }

    throw std::runtime_error("Error while getting API token.\n");
}

ACS::ROboolean_ptr TuyaBulbBaciImpl::status () {
    if(m_status_p == 0) {
		return ACS::ROboolean::_nil();
	}

    ACS::ROboolean_var prop = ACS::ROboolean::_narrow(m_status_p->getCORBAReference());
	return prop._retn();
}
   
/* --------------- [ MACI DLL support functions ] -----------------*/
#include <maciACSComponentDefines.h>
MACI_DLL_SUPPORT_FUNCTIONS(TuyaBulbBaciImpl)
/* ----------------------------------------------------------------*/