#define _POSIX_C_SOURCE 200112L

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include "error.h"
#include "shr_mem.h"
#include <semaphore.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <signal.h>

#define MAX_SIZE 300
#define MAX_AMOUNT_SIZE 10
#define MAX_PID_SIZE 10
#define MAX_PATH_SIZE 100
#define MAX_OUTPUT_SIZE (200 + MAX_PATH_SIZE)

int main(int argc, char * argv[]) {
    char amount[MAX_AMOUNT_SIZE];
    char masterPid[MAX_PID_SIZE];
    switch (argc) {
        case 1:
            fgets(amount, MAX_AMOUNT_SIZE, stdin);
            amount[strcspn(amount, "\n")] = '\0';
            fgets(masterPid, MAX_PID_SIZE, stdin);
            masterPid[strcspn(masterPid, "\n")] = '\0';
            break;
        case 3:
            strcpy(amount, argv[1]);
            strcpy(masterPid, argv[2]);
            break;
        default:
            printError("View must receive amount of files and the pid of master process by argument or stdin");
    }

    int files = atoi(amount);
    int mPid = atoi(masterPid);
    printf("%d\n", files);
    printf("%d\n", mPid);

    union sigval value;
    sigqueue(mPid, SIGUSR1, value);

    //sleep(2);

    int fd;
    char * shmPointer;

    if ((fd = shm_open("/BottlerSHM", O_RDONLY, S_IRUSR)) < 0)
        printSystemError("shm_open() -- ERROR");

    int totalSize = files * MAX_OUTPUT_SIZE;

    if ((shmPointer = mmap(0, totalSize, PROT_READ, MAP_SHARED, fd, 0)) == MAP_FAILED){
        printSystemError("mmap() -- ERROR");
    }
    void * shmStart;
    shmStart = shmPointer;

    int i = 0;
    char buf[MAX_SIZE];
    while (files-- > 0) {
        //buf[0] = '\0';
        shmPointer += readShm(shmPointer, buf, MAX_SIZE);
        printf("%d\t", i++);
        printf("%s\n", buf);
    }

    if (munmap(shmStart, totalSize) == -1)
        printSystemError("munmap() -- ERROR");

    close(fd);
//    terminateShm("/BottlerSHM", fd, shmStart, totalSize);

    sigqueue(mPid, SIGUSR2, value);

    return EXIT_SUCCESS;
}