#include "WebAPI.h"
#include "DataInterface/GraphClient.h"
#include <DataId.h>
#include <DataStorageClient.h>
#include <Logging.h>
#include <StringAlgorithm.h>
#include <iostream>
#include <sstream>


namespace DataStorageInterface {
namespace API {

// API Description

// Log Data
// Goal:	Log data into the Database
// Use:
// URL:		http://<ip>/API/log/<timestamp>/<device_id>/<data_id>/<value>

// GraphHeader Query
// Goal:
// Use:
// URL:		http://<ip>/API/graphheader/<device_id>/<data_ids>/<timespan>

// Graph Query
// Goal:
// Use:
// URL:		http://<ip>/API/graph/
// URL:		http://<ip>/API/graph/<device_id>/<data_ids>/<timespan>

// Settings Query
// Goal:	Change / query settings
// Use:
// URL:		http://<ip>/API/settings/<setting>/<value>

WebAPI::WebAPI()
{
}

WebAPI::~WebAPI()
{
}

Http::HttpServer::HttpReply WebAPI::ProcessQuery(DataStorage::DataStorageClient* pDataStorageClient, DataInterface::GraphClient* pGraphClient, const std::string& uri, const std::vector<Http::HttpPostData>& /*postData*/)
{
	if (!StringAlgorithm::iequals(uri, "/api") && !StringAlgorithm::istarts_with(uri, "/api/"))
	{
		Http::HttpServer::HttpReply reply;
		reply.status = Http::HttpServer::HttpReply::Status::Unauthorized;
		return reply;
	}

	std::string apiURI = uri.substr(4);

	std::stringstream ss;
	ss << "API Query: " << apiURI << std::endl;
	Logging::Log(Logging::Severity::Debug, ss.str());

	if (StringAlgorithm::istarts_with(apiURI, "/log/"))
		return ProcessLogQuery(pDataStorageClient, apiURI);
	else if (StringAlgorithm::istarts_with(apiURI, "/graphheader/"))
		return ProcessGraphHeaderQuery(pGraphClient, apiURI);
	else if (StringAlgorithm::istarts_with(apiURI, "/graph/"))
		return ProcessGraphQuery(pGraphClient, apiURI);
	else if (StringAlgorithm::istarts_with(apiURI, "/settings/"))
		return ProcessSettingsQuery(apiURI);


	Http::HttpServer::HttpReply reply;
	reply.status = Http::HttpServer::HttpReply::Status::InternalServerError;
	reply.content = "{\"result\": \"error\"}\r\n";
	return reply;
}

Http::HttpServer::HttpReply WebAPI::ProcessLogQuery(DataStorage::DataStorageClient* pDataStorageClient, const std::string& uri)
{
	// /log/<timestamp>/<device_id>/<data_id>/<value>

	Http::HttpServer::HttpReply reply;
	reply.status = Http::HttpServer::HttpReply::Status::InternalServerError;
	reply.content = "{\"result\": \"error\"}\r\n";

	std::vector<std::string> uriTokens = StringAlgorithm::split(uri, '/');
	if (uriTokens.size() < 6)
		return reply;

	if (uriTokens[2].empty() ||
		  uriTokens[3].empty() ||
		  uriTokens[4].empty())
		return reply;

	int timestamp = std::stoi(uriTokens[2]);
	int deviceId = std::stoi(uriTokens[3]);
	int dataId = DataStorage::DataId(uriTokens[4]).Id();
	std::string value = uriTokens[5];

	std::stringstream ss;
	ss << "Log Query: " << std::endl;
	ss << "           " << timestamp << std::endl;
	ss << "           " << deviceId << std::endl;
	ss << "           " << dataId << std::endl;
	ss << "           " << value << std::endl;
	Logging::Log(Logging::Severity::Debug, ss.str());

	// TODO: Actually Log...

	reply.status = Http::HttpServer::HttpReply::Status::Ok;
	reply.content = "{\"result\": \"success\"}\r\n";

	return reply;
}

Http::HttpServer::HttpReply WebAPI::ProcessGraphHeaderQuery(DataInterface::GraphClient* pGraphClient, const std::string& uri)
{
	// /graphheader/<device_id>/<data_ids>/<timespan>

	Http::HttpServer::HttpReply reply;
	reply.status = Http::HttpServer::HttpReply::Status::InternalServerError;
	reply.content = "{\"result\": \"error\"}\r\n";

	std::vector<std::string> uriTokens = StringAlgorithm::split(uri, '/');

	if (uriTokens.size() != 5)
		return reply;

	if (uriTokens[2].empty() ||
		  uriTokens[3].empty())
		return reply;

	try
	{
		int deviceId = stoi(uriTokens[2]);
		std::vector<int> dataIds;

		for (auto& id : StringAlgorithm::split(uriTokens[3], '-'))
			dataIds.push_back(DataStorage::DataId(id).Id());

		std::string period = uriTokens[4];
		if (uriTokens[4].empty())
			period = "day";

		nlohmann::json json = GetGraphHeader(pGraphClient, dataIds, period);

		reply.content = json.dump();
		reply.status = Http::HttpServer::HttpReply::Status::Ok;
	}
	catch (const std::exception& e)
	{
		std::cout << "ProcessGraphHeaderQuery() - Error: " << e.what() << std::endl;
		return reply;
	}

	return reply;
}

Http::HttpServer::HttpReply WebAPI::ProcessGraphQuery(DataInterface::GraphClient* pGraphClient, const std::string& uri)
{
	// /graph/<device_id>/<data_ids>/<timespan>

	Http::HttpServer::HttpReply reply;
	reply.status = Http::HttpServer::HttpReply::Status::InternalServerError;
	reply.content = "{\"result\": \"error\"}\r\n";

	std::vector<std::string> uriTokens = StringAlgorithm::split(uri, '/');

	if (uriTokens.size() != 5)
		return reply;

	if (uriTokens[2].empty() ||
		  uriTokens[3].empty())
		return reply;

	try
	{
		int deviceId = stoi(uriTokens[2]);
		std::vector<int> dataIds;

		for (auto& id : StringAlgorithm::split(uriTokens[3], '-'))
			dataIds.push_back(DataStorage::DataId(id).Id());

		std::string period = uriTokens[4];
		if (uriTokens[4].empty())
			period = "day";

		nlohmann::json json = GetGraphData(pGraphClient, deviceId, dataIds, period);

		reply.content = json.dump();
		reply.status = Http::HttpServer::HttpReply::Status::Ok;
	}
	catch (const std::exception& e)
	{
		std::cout << "ProcessGraphQuery() - Error: " << e.what() << std::endl;
		return reply;
	}

	return reply;
}

Http::HttpServer::HttpReply WebAPI::ProcessSettingsQuery(const std::string& uri)
{
	// /settings/<setting>/<value>

	Http::HttpServer::HttpReply reply;
	reply.status = Http::HttpServer::HttpReply::Status::InternalServerError;
	reply.content = "{\"result\": \"error\"}\r\n";

	std::vector<std::string> uriTokens = StringAlgorithm::split(uri, '/');

	if (uriTokens.size() < 4)
		return reply;

	std::string setting = uriTokens[2];
	std::string value = uriTokens[3];

	// Generalize in Settings struct?
	if (StringAlgorithm::iequals(setting, "debug"))
	{
		if (StringAlgorithm::iequals(value, "on"))
			Logging::SetLogMask(Logging::Severity::Debug);
		else if (StringAlgorithm::iequals(value, "off"))
			Logging::SetLogMask(Logging::Severity::Info);
		else
			return reply;
	}
	else
	{
		return reply;
	}

	reply.status = Http::HttpServer::HttpReply::Status::Ok;
	reply.content = "{\"result\": \"success\"}\r\n";

	return reply;
}

nlohmann::json WebAPI::GetGraphHeader(DataInterface::GraphClient* pGraphClient, const std::vector<int>& dataIds, const std::string& timespan)
{
	return pGraphClient->GetGraphHeader(dataIds, DataStorage::Conversions::Timespan(timespan));
}

nlohmann::json WebAPI::GetGraphData(DataInterface::GraphClient* pGraphClient, int deviceId, const std::vector<int>& dataIds, const std::string& timespan)
{
	return pGraphClient->GetGraphData(deviceId, dataIds, DataStorage::Conversions::Timespan(timespan));
}

} // namespace API
} // namespace DataStorageInterface