/*
This is a personal academic project. Dear PVS-Studio, please check it.
PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#define _POSIX_C_SOURCE 200112L

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "error.h"
#include "shr_mem.h"
#include "siglib.h"
#include "view.h"

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

    int files = atoi(amount);
    int mPid = atoi(masterPid);

    sendStartSignal(mPid);

    int totalSize = files * MAX_OUTPUT_SIZE;
    char * shmPointer, * shmStart;
    int fd = openCreatedShm(&shmPointer, totalSize);
    shmStart = shmPointer;

    char buf[MAX_SIZE];
    while (files-- > 0) {
        shmPointer += readShm(shmPointer, buf, MAX_SIZE);
        printf("%s\n", buf);
    }

    closeCreatedShm(shmStart, totalSize, fd);
    sendFinishSignal(mPid);

    return EXIT_SUCCESS;
}