#include <cjson/cJSON.h>
#include <MESA/MESA_prof_load.h>
#include <tfe_kafka_logger.h>
#include <tfe_utils.h>
#include <tfe_resource.h>

#include <event2/event.h>
#include <event.h>

#include "mpack.h"
#include "tsg_proxy_logger.h"

struct json_spec
{
	const char *log_filed_name;
	enum tfe_http_std_field field_id;
};
struct proxy_logger
{
	int entry_id;
	unsigned int en_sendlog;
	const char *device_id;
	const char *effective_device_tag;
	void* local_logger;

	unsigned long long send_cnt;
	unsigned long long random_drop;
	unsigned long long user_abort;
	char local_log_path[TFE_STRING_MAX];
	tfe_kafka_logger_t *kafka_logger;
	struct cache_evbase_instance * log_file_upload_instance;
};

enum _log_action //Bigger action number is prior.
{
	LG_ACTION_NONE = 0x00,
	LG_ACTION_MONIT = 0x01,
	LG_ACTION_FORWARD = 0x02,    /* N/A */
	LG_ACTION_REJECT = 0x10,
	LG_ACTION_DROP = 0x20,    /* N/A */
	LG_ACTION_MANIPULATE = 0x30,
	LG_ACTION_RATELIMIT = 0x40,    /* N/A */
	LG_ACTION_WHITELIST = 0x60,
	LG_ACTION_SHUNT = 0x80,
	__LG_ACTION_MAX
};

#define get_time_ms(tv) ((long long)(tv.tv_sec) * 1000 + (long long)(tv.tv_usec) / 1000)

#include "uuid_v4.h"
UUIDv4::UUIDGenerator<std::mt19937_64> uuidGenerator;

void get_http_body_uuid(char *uuid)
{
    UUIDv4::UUID uid = uuidGenerator.getUUID();
    uid.str(uuid);
	return;
}

size_t file_bucket_upload_once(struct proxy_logger* handle, char *uuid, struct evbuffer *http_body)
{
	int kafka_status=0;
	mpack_writer_t writer;
    char *mpack_data=NULL, *data=NULL;
    size_t mpack_size=0, datalen=0;

    mpack_writer_init_growable(&writer, &mpack_data, &mpack_size);
	mpack_build_map(&writer);

	mpack_write_cstr(&writer, "uuid");
	mpack_write_cstr(&writer, uuid);
    mpack_write_cstr(&writer, "fileType");
	mpack_write_cstr(&writer, "txt");
    mpack_write_cstr(&writer, "combineMode");
	mpack_write_cstr(&writer, "seek");
	mpack_write_cstr(&writer, "offset");
    mpack_write_u64(&writer, 0);
	mpack_write_cstr(&writer, "lastChunkFlag");
    mpack_write_u32(&writer, 1);
	datalen = evbuffer_get_length(http_body);
	if(datalen > 0)
	{
		data = (char *)evbuffer_pullup(http_body, datalen);
		mpack_write_cstr(&writer, "chunk");
		mpack_start_bin(&writer, datalen);
		mpack_write_bytes(&writer, (const char *)data, datalen);
		mpack_finish_bin(&writer);
	}
    mpack_write_cstr(&writer, "length");
    mpack_write_u64(&writer, datalen);
    mpack_complete_map(&writer); // mpack_init_map
    mpack_error_t errorno=mpack_writer_destroy(&writer);
    if(errorno!=mpack_ok)
	{
		TFE_LOG_ERROR(handle->local_logger, "Mpack writer destroy is error(%s), uuid: %s", mpack_error_to_string(errorno), uuid);
	}
	kafka_status = tfe_kafka_logger_send(handle->kafka_logger, TOPIC_BUCKET, mpack_data, mpack_size);
	if(kafka_status<0)
	{
		TFE_LOG_ERROR(handle->local_logger, "Kafka produce failed: %s", rd_kafka_err2name(rd_kafka_last_error()));
	}

	free(mpack_data);
	mpack_data = NULL;
	mpack_size = 0;

    return datalen;
}

struct proxy_logger* proxy_log_handle_create(const char* profile, const char* section, void* local_logger)
{
	struct proxy_logger* instance=ALLOC(struct proxy_logger,1);
	instance->local_logger=local_logger;

	TFE_LOG_INFO(local_logger,"Tsg-Pxy log is inititating from %s section %s.", profile, section);
	MESA_load_profile_uint_def(profile, section, "en_sendlog", &instance->en_sendlog, 1);
	TFE_LOG_INFO(local_logger, "Tsg-Pxy sendlog          : %s", instance->en_sendlog ? "ENABLE" : "DISABLE");

	if (!instance->en_sendlog)
	{
		return instance;
	}

	instance->device_id = (const char  *)tfe_bussiness_resouce_get(DEVICE_ID);
	instance->effective_device_tag = (const char  *)tfe_bussiness_resouce_get(EFFECTIVE_DEVICE_TAG);
	instance->kafka_logger = (tfe_kafka_logger_t *)tfe_bussiness_resouce_get(KAFKA_LOGGER);
	if (instance->kafka_logger && !instance->kafka_logger->enable)
    {
        TFE_LOG_ERROR(local_logger, "Tsg-Pxy sendlog ENABLE, but tfe kafka logger DISABLED.");
        goto error_out;
    }

	return instance;

error_out:
	free(instance);
	return NULL;
}

int proxy_send_log(struct proxy_logger* handle, const struct proxy_log* log_msg)
{
	const struct tfe_http_session* http=log_msg->http;
	const struct tfe_stream_addr* addr=log_msg->stream->addr;
	const char* tmp_val=NULL;
	cJSON  *common_obj=NULL, *per_hit_obj=NULL;
	char* log_payload=NULL;
	int kafka_status=0;
	int send_cnt=0;
	struct timeval cur_time;
	char src_ip_str[MAX(INET6_ADDRSTRLEN,INET_ADDRSTRLEN)] = {0};
	char dst_ip_str[MAX(INET6_ADDRSTRLEN,INET_ADDRSTRLEN)] = {0};

	const char *app_proto[]= {"unkonw","http1", "http2"};

	const char *manipulate_action_map[]= {"redirect","block","replace","hijack","insert","edit_element","run_script"};

	const char *panggu_action_map[__LG_ACTION_MAX];
	panggu_action_map[LG_ACTION_MONIT]="monitor";
	panggu_action_map[LG_ACTION_REJECT]="deny";
	panggu_action_map[LG_ACTION_WHITELIST]="allow";

	struct json_spec req_fields[]={	{"http_cookie", TFE_HTTP_COOKIE},
									{"http_referer", TFE_HTTP_REFERER},
									{"http_user_agent", TFE_HTTP_USER_AGENT},
									{"http_request_content_type", TFE_HTTP_CONT_TYPE},
									{"http_request_content_length", TFE_HTTP_CONT_LENGTH}};

	struct json_spec resp_fields[]={	{"http_response_content_type", TFE_HTTP_CONT_TYPE},
										{"http_response_content_length", TFE_HTTP_CONT_LENGTH},
										{"http_set_cookie", TFE_HTTP_SET_COOKIE}};

	if (!handle->en_sendlog)
	{
		return 0;
	}

	common_obj=cJSON_CreateObject();
	gettimeofday(&cur_time, NULL);
	cJSON_AddNumberToObject(common_obj, "start_timestamp_ms", get_time_ms(http->start_time));
	cJSON_AddNumberToObject(common_obj, "end_timestamp_ms", get_time_ms(cur_time));

	char source_subscribe_id[64]={0};
	char opt_val[24]={0}; uint16_t opt_out_size;
	struct tfe_cmsg * cmsg = tfe_stream_get0_cmsg(log_msg->stream);
	if (cmsg!=NULL)
	{
		int ret=tfe_cmsg_get_value(cmsg, TFE_CMSG_STREAM_TRACE_ID, (unsigned char *) opt_val, sizeof(opt_val), &opt_out_size);
		if (ret==0)
		{
			cJSON_AddStringToObject(common_obj, "session_id", opt_val);
		}
		ret = tfe_cmsg_get_value(cmsg, TFE_CMSG_SRC_SUB_ID, (unsigned char *)source_subscribe_id, sizeof(source_subscribe_id), &opt_out_size);
		if (ret==0)
		{
			cJSON_AddStringToObject(common_obj, "subscriber_id", source_subscribe_id);
		}
	}

	if (http->req)
	{
		char *request_line=NULL;
		struct tfe_http_req_spec req_spec=http->req->req_spec;
		asprintf(&request_line, "%s %s HTTP/%d.%d", http_std_method_to_string(req_spec.method), req_spec.url, http->major_version, http->minor_version);
		cJSON_AddStringToObject(common_obj, "http_request_line", request_line);
		free(request_line);
	}

	if (http->resp)
	{
		char *response_line=NULL;
		struct tfe_http_resp_spec resp_spec=http->resp->resp_spec;
		asprintf(&response_line, "HTTP/%d.%d %d OK", http->major_version, http->minor_version, resp_spec.resp_code);
		cJSON_AddStringToObject(common_obj, "http_response_line", response_line);
		cJSON_AddNumberToObject(common_obj, "http_status_code", resp_spec.resp_code);
		free(response_line);
	}

	switch(addr->addrtype)
	{
		case TFE_ADDR_STREAM_TUPLE4_V4:
			cJSON_AddNumberToObject(common_obj, "address_type", 4);
			inet_ntop(AF_INET, &addr->tuple4_v4->saddr, src_ip_str, sizeof(src_ip_str));
			inet_ntop(AF_INET, &addr->tuple4_v4->daddr, dst_ip_str, sizeof(dst_ip_str));
			cJSON_AddStringToObject(common_obj, "client_ip", src_ip_str);
			cJSON_AddStringToObject(common_obj, "server_ip", dst_ip_str);
			cJSON_AddNumberToObject(common_obj, "client_port", ntohs(addr->tuple4_v4->source));
			cJSON_AddNumberToObject(common_obj, "server_port", ntohs(addr->tuple4_v4->dest));
			break;
		case TFE_ADDR_STREAM_TUPLE4_V6:
			cJSON_AddNumberToObject(common_obj, "address_type", 6);
			inet_ntop(AF_INET6, &addr->tuple4_v6->saddr, src_ip_str, sizeof(src_ip_str));
			inet_ntop(AF_INET6, &addr->tuple4_v6->daddr, dst_ip_str, sizeof(dst_ip_str));
			cJSON_AddStringToObject(common_obj, "client_ip", src_ip_str);
			cJSON_AddStringToObject(common_obj, "server_ip", dst_ip_str);
			cJSON_AddNumberToObject(common_obj, "client_port", ntohs(addr->tuple4_v6->source));
			cJSON_AddNumberToObject(common_obj, "server_port", ntohs(addr->tuple4_v6->dest));
			break;
		default:
			break;
	}

	size_t ret=0, c2s_byte_num = 0, s2c_byte_num =0;
	ret = tfe_stream_info_get(log_msg->stream, INFO_FROM_DOWNSTREAM_RX_OFFSET, &c2s_byte_num, sizeof(c2s_byte_num));
	if(ret != 0)
	{
		c2s_byte_num = log_msg->c2s_byte_num;
	}
	ret = tfe_stream_info_get(log_msg->stream, INFO_FROM_UPSTREAM_RX_OFFSET, &s2c_byte_num, sizeof(s2c_byte_num));
	if(ret !=0)
	{
		s2c_byte_num = log_msg->s2c_byte_num;
	}

	cJSON_AddStringToObject(common_obj, "http_version", app_proto[http->major_version]);
    cJSON_AddStringToObject(common_obj, "decoded_as", "HTTP");
	cJSON_AddNumberToObject(common_obj, "out_link_id", 0);
	cJSON_AddNumberToObject(common_obj, "in_link_id", 0);
	cJSON_AddStringToObject(common_obj, "sled_ip", handle->kafka_logger->local_ip_str);
	cJSON_AddNumberToObject(common_obj, "t_vsys_id", handle->kafka_logger->t_vsys_id);
	cJSON_AddStringToObject(common_obj, "device_id", handle->device_id);
	cJSON_AddNumberToObject(common_obj, "sent_bytes", c2s_byte_num);
	cJSON_AddNumberToObject(common_obj, "received_bytes", s2c_byte_num);
	cJSON_AddStringToObject(common_obj, "http_url", http->req->req_spec.url);
	cJSON_AddStringToObject(common_obj, "http_host", http->req->req_spec.host);
	cJSON_AddStringToObject(common_obj, "server_fqdn", http->req->req_spec.host);

	if(handle->effective_device_tag)
	{
		cJSON_AddStringToObject(common_obj, "device_tag", handle->effective_device_tag);
	}

	for(size_t i=0;i<sizeof(req_fields)/sizeof(struct json_spec);i++)
	{
		tmp_val=tfe_http_std_field_read(http->req, req_fields[i].field_id);
		if(tmp_val!=NULL)
		{
			cJSON_AddStringToObject(common_obj,req_fields[i].log_filed_name, tmp_val);
		}
	}
	for(size_t i=0;i<sizeof(resp_fields)/sizeof(struct json_spec) && http->resp!=NULL;i++)
	{
		tmp_val=tfe_http_std_field_read(http->resp, resp_fields[i].field_id);
		if(tmp_val!=NULL)
		{
			cJSON_AddStringToObject(common_obj,resp_fields[i].log_filed_name, tmp_val);
		}
	}

	#define FILE_CHUNK_UUID_LEN  40
    char uuid[FILE_CHUNK_UUID_LEN]={0};
	size_t datalen=0;

	for(size_t i=0; i<log_msg->result_num; i++)
	{
		if(log_msg->result[i].do_log!=1) continue;

		if(log_msg->req_body!=NULL)
		{
			if(uuid[0] != '\0')
			{
				cJSON_AddStringToObject(common_obj, "http_request_body", uuid);
			}
			else
			{
				get_http_body_uuid(uuid);
				datalen=file_bucket_upload_once(handle, uuid, log_msg->req_body);
				if(datalen>0)
				{
					cJSON_AddStringToObject(common_obj, "http_request_body", uuid);
				}
				else
				{
					TFE_LOG_ERROR(handle->local_logger, "Upload req_body failed.");
				}
			}
		}
		if(log_msg->resp_body!=NULL)
		{
			if(uuid[0] != '\0')
			{
				cJSON_AddStringToObject(common_obj, "http_response_body", uuid);
			}
			else
			{
				get_http_body_uuid(uuid);
				datalen=file_bucket_upload_once(handle, uuid, log_msg->resp_body);
				if(datalen>0)
				{
					cJSON_AddStringToObject(common_obj, "http_response_body", uuid);
				}
				else
				{
					TFE_LOG_ERROR(handle->local_logger, "Upload resp_body failed.");
				}
			}
		}
	}

	for(size_t i=0; i<log_msg->result_num; i++)
	{
		TFE_LOG_DEBUG(handle->local_logger, "URL: %s, policy_id: %lld, service: %d, do_log:%d",
						http->req->req_spec.url,
						log_msg->result[i].config_id,
						log_msg->result[i].service_id,
						log_msg->result[i].do_log);

		if(log_msg->result[i].do_log==0)
		{
			continue;
		}

		cJSON *proxy_rule_list=NULL;
		int config_id[1]={0};

		per_hit_obj=cJSON_Duplicate(common_obj, 1);
		config_id[0]=log_msg->result[i].config_id;
		proxy_rule_list = cJSON_CreateIntArray(config_id, 1);
		cJSON_AddItemToObject(per_hit_obj, "proxy_rule_list", proxy_rule_list);
		cJSON_AddNumberToObject(per_hit_obj, "vsys_id", log_msg->result[i].vsys_id);
		if(log_msg->result[i].action == LG_ACTION_MANIPULATE)
		{
			cJSON_AddStringToObject(per_hit_obj, "proxy_action", manipulate_action_map[log_msg->action]);
			cJSON_AddNumberToObject(per_hit_obj, "http_action_file_size", log_msg->inject_sz);
		}
		else
		{
			cJSON_AddStringToObject(per_hit_obj, "proxy_action", panggu_action_map[(unsigned char)(log_msg->result[i].action)]);
		}
		if(log_msg->location_client)
		{
			cJSON_AddStringToObject(per_hit_obj, "client_geolocation", log_msg->location_client);
		}
		if(log_msg->location_server)
		{
			cJSON_AddStringToObject(per_hit_obj, "server_geolocation", log_msg->location_server);
		}
		if(log_msg->asn_client)
    	{
			cJSON_AddStringToObject(common_obj, "client_asn", log_msg->asn_client);
		}
		if (log_msg->asn_server)
		{
		    cJSON_AddStringToObject(common_obj, "server_asn", log_msg->asn_server);
		}

		log_payload = cJSON_PrintUnformatted(per_hit_obj);

		TFE_LOG_DEBUG(handle->local_logger, "%s", log_payload);

		kafka_status = tfe_kafka_logger_send(handle->kafka_logger, TOPIC_LOGGER, log_payload, strlen(log_payload));
		free(log_payload);
		cJSON_Delete(per_hit_obj);
		if(kafka_status<0)
		{
			TFE_LOG_ERROR(handle->local_logger, "Kafka produce failed: %s", rd_kafka_err2name(rd_kafka_last_error()));
		}
		send_cnt++;
	}

	cJSON_Delete(common_obj);
	return send_cnt;
}