#include<sys/socket.h>
#include<sys/types.h>
#include<netinet/ip.h>
#include<arpa/inet.h>
#include<stdio.h>
#include<string.h>
#include<unistd.h>
#include<signal.h>
#include<stdlib.h>

int main(int argc, char ** argv){
	struct sockaddr_in sad;
	sad.sin_port = htons(5143);
	sad.sin_addr.s_addr = INADDR_ANY;
	sad.sin_family = AF_INET;

	int skt = socket(AF_INET, SOCK_STREAM, 0); // Step 1
	if(skt == -1){
		perror("socket");
		return 1;
	}
	if( bind(skt, (struct sockaddr*)(&sad), sizeof(struct sockaddr_in)) ){ // step 2
		perror("bind");
		return 1;
	}
	if( listen(skt, 5) ){ // step 3
		perror("listen");
		return 1;
	}	
	while(1){
		int client_fd = accept(skt, 0, 0); // step 4
		char request[5] = "   ";
		int64_t nums[2];
		int64_t result = 1;
		while(read(client_fd, request, 4) > 0){
			read(client_fd, nums, 16);
			printf("Got request %s\n", request);
			if(nums[1] == 0){
				write(client_fd, "LAZY", 4);
				write(client_fd, &result, 8);
				goto skip_result;
			}
			else if(request[0] == 'M'){
				printf("Doing Modulus\n");
				result = nums[0] % nums[1];
			} else {
				result = nums[0] / nums[1];
			}
			write(client_fd, "RESL", 4);
			write(client_fd, &result, 8);
skip_result:
		}

		close(client_fd);
	}

	return 0;
}