tu-hw

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

//used to use scanf instead of scanf_s
#pragma warning(disable: 4996)

//used for validation of year
const int P_YEAR = 2020;

//date-time struct in the correct format
struct dateTime {
    int mount;
    int day;
    int year;
};

//printing date time obj
void showDateTime(const struct dateTime* toPrint) {
    printf("$Mount: %d\n$Day: %d\n$Year: %d \n", toPrint->mount, toPrint->day, toPrint->year);
}

//setting date time to default vals
void nullDateTime(struct dateTime* toInit) {
    toInit->day = 0;
    toInit->mount = 0;
    toInit->year = 0;
}

//getting data from the user about date-time obj
void initDateTime(struct dateTime* toInit) {
    int mnt = 0;
    int day = 0;
    int year = 0;

    printf("$Enter mount[number between 1-12]: ");
    scanf("%4d", &mnt);

    printf("$Enter day[number between 1-31]: ");
    scanf("%4d", &day);

    printf("$Enter year[number greater than %d]: ", P_YEAR);
    scanf("%4d", &year);

    if (mnt < 13 && year > P_YEAR && day < 31) {
        toInit->mount = mnt; toInit->day = day; toInit->year = year;
    }
    else {
        nullDateTime(toInit);
        return;
    }
}

//tourist agency structure
struct touristAgency {
    char* name;
    char* dest;
    struct dateTime departure;
    struct dateTime arrival;
};

//takes care of dynamic memory
void freeAgency(struct touristAgency* freeMe) {
    free(freeMe->name);
    free(freeMe->dest);
}

//initializing t.a. obj. with passed data
void initAgency(struct touristAgency* toInit, struct dateTime departure, struct dateTime arrival) {
    printf("$Enter name: ");
    char name[1024];
    scanf("%s", &name);
    printf("$Enter destination: ");
    char dest[1024];
    scanf("%s", &dest);

    int lenName = strlen(name);
    if (!lenName)
        return;

    toInit->name = malloc(sizeof(char) * lenName + 1);
    memcpy(toInit->name, name, lenName * sizeof(char));

    toInit->name[lenName] = '\0';

    int lenDest = strlen(dest);

    if (!lenDest) {
        return;
    }

    toInit->dest = malloc(sizeof(char) * lenDest + 1);
    memcpy(toInit->dest, dest, lenDest * sizeof(char));
    toInit->dest[lenDest] = '\0';

    printf("======arrival======\n");

    initDateTime(&toInit->arrival, arrival.mount, arrival.day, arrival.year);

    printf("======departure======\n");
    initDateTime(&toInit->departure, departure.mount, departure.day, departure.year);
}

//printing t.a. data
void showAgency(const struct touristAgency* printMe) {
    printf("$Name: %s\n", printMe->name);
    printf("$Destination: %s\n", printMe->dest);
    showDateTime(&printMe->arrival);
    showDateTime(&printMe->departure);

}

//checks if two dates are "equal"
int equalDates(const struct dateTime* _first, const struct dateTime* _second) {
    return ((_first->day == _second->day) &&
        (_first->mount == _second->mount) &&
        (_first->year == _second->year));
}

//linear search
void search(const struct touristAgency* database, int len) {
    struct dateTime dt;
    int found = 0;
    initDateTime(&dt);

    for (int i = 0; i < len; i++)
        if (equalDates(&database[i].arrival, &dt) == 1) {
            printf("\n======FOUND======\n");
            showAgency(&database[i]);
            found = 1;
            printf("\n");
        }
    if (!found)
        printf("No such list\n");
}

//main loop:
void run() {
    struct touristAgency* data = malloc(20 * sizeof(struct touristAgency));
    char c = '\0';
    struct dateTime arrival;
    struct dateTime departure;
    for (int i = 0; i < 20; i++) {
        printf("$Press\n$a to add\n$s to search\n$v to view\n$x to exit: ");

        scanf("%s", &c);

        switch (c) {
        case'a':
            nullDateTime(&arrival);
            nullDateTime(&departure);
            initAgency(&data[i], departure, arrival);
            break;
        case 'v':
            for (int j = 0; j < i; j++)
                showAgency(&data[j]);
            i--;
            break;
        case 's':
            if (i == 0)
                printf("No data!\n");
            else
                search(data, i);
            i--;
            break;
        case 'x':
            printf("Bye!!!");
            for (int j = 0; j < i; j++)
                freeAgency(&data[j]);
            free(data);
            exit(1);
            break;
        default:
            printf("$invalid comand\n");
            i--;
            break;
        }
    }
    printf("$Maximum of 20 records reached!");

    for (int i = 0; i < 20; i++)
        freeAgency(&data[i]);

    free(data);
}

int main() {
    run();
}