/* (c) ZeroTier, Inc.
 * See LICENSE.txt in nonfree/
 */

#include "CtlUtil.hpp"

#ifdef ZT_CONTROLLER_USE_LIBPQ

#include <iomanip>
#include <sstream>

#ifdef ZT1_CENTRAL_CONTROLLER
#include <google/cloud/bigtable/admin/bigtable_table_admin_client.h>
#include <google/cloud/bigtable/admin/bigtable_table_admin_connection.h>
#include <google/cloud/bigtable/table.h>
#include <google/cloud/pubsub/admin/subscription_admin_client.h>
#include <google/cloud/pubsub/admin/subscription_admin_connection.h>
#include <google/cloud/pubsub/admin/topic_admin_client.h>
#include <google/cloud/pubsub/message.h>
#include <google/cloud/pubsub/subscriber.h>
#include <google/cloud/pubsub/subscription.h>
#include <google/cloud/pubsub/topic.h>

namespace pubsub = ::google::cloud::pubsub;
namespace pubsub_admin = ::google::cloud::pubsub_admin;
namespace bigtable_admin = ::google::cloud::bigtable_admin;
#endif

namespace ZeroTier {

const char* _timestr()
{
	time_t t = time(0);
	char* ts = ctime(&t);
	char* p = ts;
	if (! p)
		return "";
	while (*p) {
		if (*p == '\n') {
			*p = (char)0;
			break;
		}
		++p;
	}
	return ts;
}

std::vector<std::string> split(std::string str, char delim)
{
	std::istringstream iss(str);
	std::vector<std::string> tokens;
	std::string item;
	while (std::getline(iss, item, delim)) {
		tokens.push_back(item);
	}
	return tokens;
}

std::string url_encode(const std::string& value)
{
	std::ostringstream escaped;
	escaped.fill('0');
	escaped << std::hex;

	for (std::string::const_iterator i = value.begin(), n = value.end(); i != n; ++i) {
		std::string::value_type c = (*i);

		// Keep alphanumeric and other accepted characters intact
		if (isalnum(c) || c == '-' || c == '_' || c == '.' || c == '~') {
			escaped << c;
			continue;
		}

		// Any other characters are percent-encoded
		escaped << std::uppercase;
		escaped << '%' << std::setw(2) << int((unsigned char)c);
		escaped << std::nouppercase;
	}

	return escaped.str();
}

std::string random_hex_string(std::size_t length)
{
	static const char hex_chars[] = "0123456789abcdef";
	std::random_device rd;
	std::mt19937 gen(rd());
	std::uniform_int_distribution<> dis(0, 15);

	std::string result;
	result.reserve(length);
	for (std::size_t i = 0; i < length; ++i) {
		result += hex_chars[dis(gen)];
	}
	return result;
}

#ifdef ZT1_CENTRAL_CONTROLLER
void create_gcp_pubsub_topic_if_needed(std::string project_id, std::string topic_id)
{
	// This is a no-op if the topic already exists.
	auto topicAdminClient = pubsub_admin::TopicAdminClient(pubsub_admin::MakeTopicAdminConnection());
	auto topicName = pubsub::Topic(project_id, topic_id).FullName();
	auto topicResult = topicAdminClient.GetTopic(topicName);
	if (! topicResult.ok()) {
		// Only create if not found
		if (topicResult.status().code() == google::cloud::StatusCode::kNotFound) {
			auto createResult = topicAdminClient.CreateTopic(topicName);
			if (! createResult.ok()) {
				fprintf(stderr, "Failed to create topic: %s\n", createResult.status().message().c_str());
				throw std::runtime_error("Failed to create topic");
			}
			fprintf(stderr, "Created topic: %s\n", topicName.c_str());
		}
		else {
			fprintf(stderr, "Failed to get topic: %s\n", topicResult.status().message().c_str());
			throw std::runtime_error("Failed to get topic");
		}
	}
}

// void create_bigtable_table(std::string project_id, std::string instance_id)
// {
// 	auto bigtableAdminClient =
// 		bigtable_admin::BigtableTableAdminClient(bigtable_admin::MakeBigtableTableAdminConnection());

// 	std::string table_id = "member_status";
// 	std::string table_name = "projects/" + project_id + "/instances/" + instance_id + "/tables/" + table_id;

// 	// Check if the table exists
// 	auto table = bigtableAdminClient.GetTable(table_name);
// 	if (! table.ok()) {
// 		if (table.status().code() == google::cloud::StatusCode::kNotFound) {
// 			google::bigtable::admin::v2::Table table_config;
// 			table_config.set_name(table_id);
// 			auto families = table_config.mutable_column_families();
// 			// Define column families
// 			// Column family "node_info" with max 1 version
// 			// google::bigtable::admin::v2::ColumnFamily* node_info = table_config.add_column_families();
// 			// Column family "check_in" with max 1 version

// 			auto create_result = bigtableAdminClient.CreateTable(
// 				"projects/" + project_id + "/instances/" + instance_id, table_id, table_config);

// 			if (! create_result.ok()) {
// 				fprintf(
// 					stderr, "Failed to create Bigtable table member_status: %s\n",
// 					create_result.status().message().c_str());
// 				throw std::runtime_error("Failed to create Bigtable table");
// 			}
// 			fprintf(stderr, "Created Bigtable table: member_status\n");
// 		}
// 		else {
// 			fprintf(stderr, "Failed to get Bigtable table member_status: %s\n", table.status().message().c_str());
// 			throw std::runtime_error("Failed to get Bigtable table");
// 		}
// 	}
// }
#endif

}	// namespace ZeroTier
#endif