#include "kvstore.h"
#include "kvs_rw_tools.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

#if ENABLE_ARRAY
extern kvs_array_t global_array;
#endif

#if ENABLE_RBTREE
extern kvs_rbtree_t global_rbtree;
#endif

#if ENABLE_HASH
extern kvs_hash_t global_hash;
#endif

int global_cmd_log_fd = -1;

void *kvs_malloc(size_t size) {
	return malloc(size);
}

void kvs_free(void *ptr) {
	return free(ptr);
}


const char *command[] = {
	"SET", "GET", "DEL", "MOD", "EXIST",
	"RSET", "RGET", "RDEL", "RMOD", "REXIST",
	"HSET", "HGET", "HDEL", "HMOD", "HEXIST"
};

const char *response[] = {

};


int kvs_split_token(char *msg, char *tokens[]) {

	if (msg == NULL || tokens == NULL) return -1;

	int idx = 0;
	char *token = strtok(msg, " ");
	
	while (token != NULL) {
		//printf("idx: %d, %s\n", idx, token);
		
		tokens[idx ++] = token;
		token = strtok(NULL, " ");
	}

	return idx;
}


// SET Key Value
// tokens[0] : SET
// tokens[1] : Key
// tokens[2] : Value

#if !BIN_SAFE
int kvs_filter_protocol(char **tokens, int count, char *response) {

	if (tokens[0] == NULL || count == 0 || response == NULL) return -1;

	int cmd = KVS_CMD_START;
	for (cmd = KVS_CMD_START;cmd < KVS_CMD_COUNT;cmd ++) {
		if (strcmp(tokens[0], command[cmd]) == 0) {
			break;
		} 
	}

	int length = 0;
	int ret = 0;
	char *key = tokens[1];
	char *value = tokens[2];

	switch(cmd) {
#if ENABLE_ARRAY
	case KVS_CMD_SET:
		ret = kvs_array_set(&global_array ,key, value);
		if (ret < 0) {
			length = sprintf(response, "ERROR\r\n");
		} else if (ret == 0) {
			length = sprintf(response, "OK\r\n");
		} else {
			length = sprintf(response, "EXIST\r\n");
		} 
		
		break;
	case KVS_CMD_GET: {
		char *result = kvs_array_get(&global_array, key);
		if (result == NULL) {
			length = sprintf(response, "NO EXIST\r\n");
		} else {
			length = sprintf(response, "%s\r\n", result);
		}
		break;
	}
	case KVS_CMD_DEL:
		ret = kvs_array_del(&global_array ,key);
		if (ret < 0) {
			length = sprintf(response, "ERROR\r\n");
 		} else if (ret == 0) {
			length = sprintf(response, "OK\r\n");
		} else {
			length = sprintf(response, "NO EXIST\r\n");
		}
		break;
	case KVS_CMD_MOD:
		ret = kvs_array_mod(&global_array ,key, value);
		if (ret < 0) {
			length = sprintf(response, "ERROR\r\n");
 		} else if (ret == 0) {
			length = sprintf(response, "OK\r\n");
		} else {
			length = sprintf(response, "NO EXIST\r\n");
		}
		break;
	case KVS_CMD_EXIST:
		ret = kvs_array_exist(&global_array ,key);
		if (ret == 0) {
			length = sprintf(response, "EXIST\r\n");
		} else {
			length = sprintf(response, "NO EXIST\r\n");
		}
		break;
#endif
	// rbtree
#if ENABLE_RBTREE
	case KVS_CMD_RSET:
		ret = kvs_rbtree_set(&global_rbtree ,key, value);
		if (ret < 0) {
			length = sprintf(response, "ERROR\r\n");
		} else if (ret == 0) {
			length = sprintf(response, "OK\r\n");
		} else {
			length = sprintf(response, "EXIST\r\n");
		} 
		
		break;
	case KVS_CMD_RGET: {
		char *result = kvs_rbtree_get(&global_rbtree, key);
		if (result == NULL) {
			length = sprintf(response, "NO EXIST\r\n");
		} else {
			length = sprintf(response, "%s\r\n", result);
		}
		break;
	}
	case KVS_CMD_RDEL:
		ret = kvs_rbtree_del(&global_rbtree ,key);
		if (ret < 0) {
			length = sprintf(response, "ERROR\r\n");
 		} else if (ret == 0) {
			length = sprintf(response, "OK\r\n");
		} else {
			length = sprintf(response, "NO EXIST\r\n");
		}
		break;
	case KVS_CMD_RMOD:
		ret = kvs_rbtree_mod(&global_rbtree ,key, value);
		if (ret < 0) {
			length = sprintf(response, "ERROR\r\n");
 		} else if (ret == 0) {
			length = sprintf(response, "OK\r\n");
		} else {
			length = sprintf(response, "NO EXIST\r\n");
		}
		break;
	case KVS_CMD_REXIST:
		ret = kvs_rbtree_exist(&global_rbtree ,key);
		if (ret == 0) {
			length = sprintf(response, "EXIST\r\n");
		} else {
			length = sprintf(response, "NO EXIST\r\n");
		}
		break;
#endif
#if ENABLE_HASH
	case KVS_CMD_HSET:
		ret = kvs_hash_set(&global_hash ,key, value);
		if (ret < 0) {
			length = sprintf(response, "ERROR\r\n");
		} else if (ret == 0) {
			length = sprintf(response, "OK\r\n");
		} else {
			length = sprintf(response, "EXIST\r\n");
		} 
		
		break;
	case KVS_CMD_HGET: {
		char *result = kvs_hash_get(&global_hash, key);
		if (result == NULL) {
			length = sprintf(response, "NO EXIST\r\n");
		} else {
			length = sprintf(response, "%s\r\n", result);
		}
		break;
	}
	case KVS_CMD_HDEL:
		ret = kvs_hash_del(&global_hash ,key);
		if (ret < 0) {
			length = sprintf(response, "ERROR\r\n");
 		} else if (ret == 0) {
			length = sprintf(response, "OK\r\n");
		} else {
			length = sprintf(response, "NO EXIST\r\n");
		}
		break;
	case KVS_CMD_HMOD:
		ret = kvs_hash_mod(&global_hash ,key, value);
		if (ret < 0) {
			length = sprintf(response, "ERROR\r\n");
 		} else if (ret == 0) {
			length = sprintf(response, "OK\r\n");
		} else {
			length = sprintf(response, "NO EXIST\r\n");
		}
		break;
	case KVS_CMD_HEXIST:
		ret = kvs_hash_exist(&global_hash ,key);
		if (ret == 0) {
			length = sprintf(response, "EXIST\r\n");
		} else {
			length = sprintf(response, "NO EXIST\r\n");
		}
		break;
#endif

	default: 
		assert(0);
	}

	return length;
}

#endif


#if NEW_KVSTORE
/**
 * input 	: request request_length
 * output	: response response_length
 * return	: -1 error, =0 半包, 1 成功
 */
int kvs_protocol(char *request, int request_length, char *response, int *response_length){
	if (!request || request_length <= 0 || !response || !response_length) return -1;
	int consumed = 0;
	int out_len = 0;

	static int i = 0;
	while(consumed < request_length ){
		if(i > 33){
			i = i+1;
			i = i-1;
		}
		if(i == 47) i = 0;
		++i;

		kvs_req_t req;
		memset(&req, 0, sizeof(kvs_req_t));

		const uint8_t *p = request+consumed;
		int remain = request_length - consumed;

		int len = kvs_parse_one_cmd(p, remain, &req);
		if(len < 0){
		// 解析失败
			kvs_free_request(&req);
			*response_length = out_len;
			return -1;
		}
		else if(len == 0){
		// 半包
			kvs_free_request(&req);
			break;
		}
		
		kvs_rsp_t rsp;
		memset(&rsp, 0, sizeof(kvs_rsp_t));

		// 执行失败
		if (kvs_execute_one_cmd(&req, &rsp) < 0){
			kvs_free_request(&req);
            *response_length = out_len;
			return -1;
		}else{
// 执行成功，在这里保存到日志中。
			if(rsp.status == KVS_STATUS_OK){
				if(req.op == KVS_CMD_SET || req.op == KVS_CMD_MOD || req.op == KVS_CMD_DEL){
					kvs_save_cmd_to_logfile(p, len, global_cmd_log_fd);
				}
			}
		}

		int resp_len = kvs_build_one_rsp(&rsp, (uint8_t *)response+out_len, KVS_MAX_RESPONSE-out_len);
		// 构建响应 <0 构建失败
		kvs_free_request(&req);
		if (resp_len < 0) {
            *response_length = out_len;
			return -1;
		}

		// printf("resp_len:%d\n", resp_len);
		// printf("consumed:%d\n", len);
		out_len += resp_len;
		consumed += len;
	}

    *response_length = out_len;
	return consumed;
}
#else
/*
 * msg: request message
 * length: length of request message
 * response: need to send
 * @return : length of response
 */

int kvs_protocol(char *msg, int length, char *response) {  //
	
// SET Key Value
// GET Key
// DEL Key
	if (msg == NULL || length <= 0 || response == NULL) return -1;

	//printf("recv %d : %s\n", length, msg);

	char *tokens[KVS_MAX_TOKENS] = {0};

	int count = kvs_split_token(msg, tokens);
	if (count == -1) return -1;

	//memcpy(response, msg, length);

	return kvs_filter_protocol(tokens, count, response);
}
#endif


int init_cmd_log(const char *file, int *logfd){
	if(!file) return -1;
	int fd = open(file, O_RDWR | O_CREAT | O_APPEND, 0644);
	if(fd < 0) return -2;

	*logfd = fd;
	return 0;
}

int destroy_cmd_log(int logfd){
	close(logfd);
	return 0;
}

int init_kvengine(void) {

#if ENABLE_ARRAY
	memset(&global_array, 0, sizeof(kvs_array_t));
	kvs_array_create(&global_array);

	kvs_array_load(&global_array, KVS_ARRAY_FILE);
#endif

#if ENABLE_RBTREE
	memset(&global_rbtree, 0, sizeof(kvs_rbtree_t));
	kvs_rbtree_create(&global_rbtree);
#endif

#if ENABLE_HASH
	memset(&global_hash, 0, sizeof(kvs_hash_t));
	kvs_hash_create(&global_hash);
#endif

	init_cmd_log(KVS_CMD_LOG_FILE, &global_cmd_log_fd);
	kvs_replay_log(KVS_CMD_LOG_FILE, global_cmd_log_fd);

	return 0;
}

void dest_kvengine(void) {
#if ENABLE_ARRAY
	kvs_array_destroy(&global_array);
#endif
#if ENABLE_RBTREE
	kvs_rbtree_destroy(&global_rbtree);
#endif
#if ENABLE_HASH
	kvs_hash_destroy(&global_hash);
#endif

	destroy_cmd_log(global_cmd_log_fd);
}



int main(int argc, char *argv[]) {

	if (argc != 2) return -1;

	int port = atoi(argv[1]);

	init_kvengine();
	
	
#if (NETWORK_SELECT == NETWORK_REACTOR)
	reactor_start(port, kvs_protocol);  //
#elif (NETWORK_SELECT == NETWORK_PROACTOR)
	proactor_start(port, kvs_protocol);
#elif (NETWORK_SELECT == NETWORK_NTYCO)
	ntyco_start(port, kvs_protocol);
#endif

	dest_kvengine();

}