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

struct Data {
    char name[5];
    char country[16];
    float dl;
    float hr;
    float vs;
    float ob;
    unsigned int vr;
    unsigned char tp;
    unsigned short m;
    float gh;
};

int load_table (struct Data* data, char* fn) {
    int n, i;
    FILE* fp = fopen(fn, "r");
    if (!fp) {
        printf("Can't open file\n");
        return 0;
    }
    fscanf(fp, "%d", &n);
    //printf("%d\n", n);

    for (i = 0; i < n; i++) {
        fscanf(fp, "%s %s %f %f %f %u %hhu %hu %f", data[i].name, data[i].country, &data[i].dl, &data[i].hr, &data[i].vs, &data[i].vr, &data[i].tp, &data[i].m, &data[i].gh);
        data[i].ob = data[i].vs * data[i].hr * data[i].dl;
        //printf("%s %s %f %f %f %u %hhu %hu %f\n", data[i].name, data[i].country, data[i].dl, data[i].hr, data[i].vs, data[i].vr, data[i].tp, data[i].m, data[i].gh);

    }

    fclose(fp);
    return n;
}

void print_table(struct Data* data, int n) {
    int i;
    printf("| NAME | COUNTRY | SIZE                     | VOLUME | FREQUENCY | START PULSE | MASS | PRICE    |\n");
    printf("|      |         | LENGTH X WIDTH  X HEIGHT |    M^3 |   REV/MIN |       AMPER |   KG | 1000 RUB |\n");
    printf("|------|---------|--------------------------|--------|-----------|-------------|------|----------|\n");

    for (i = 0; i < n; i++)
        printf("| %4.4s | %7.7s | %6.2f X %6.2f X %6.2f | %6.0f | %9u | %11hhu | %4hu | %8.2f |\n", data[i].name, data[i].country, data[i].dl, data[i].hr, data[i].vs, data[i].ob, data[i].vr, data[i].tp, data[i].m, data[i].gh);
    printf("|------|---------|--------------------------|--------|-----------|-------------|------|----------|\n");
}

int add_str(struct Data* data, int n) {
    printf("Enter NAME: ");
    scanf("%s", data[n].name);
    printf("Enter COUNTRY: ");
    scanf("%s", data[n].country);
    printf("Enter LENGTH: ");
    scanf("%f", &data[n].dl);
    printf("Enter WIDTH: ");
    scanf("%f", &data[n].hr);
    printf("Enter HEIGHT: ");
    scanf("%f", &data[n].vs);
    printf("Enter FREQUENCY: ");
    scanf("%u", &data[n].vr);
    printf("Enter START PULSE: ");
    scanf("%hhu", &data[n].tp);
    printf("Enter MASS: ");
    scanf("%hu", &data[n].m);
    printf("Enter PRICE: ");
    scanf("%f", &data[n].gh);
    data[n].ob = data[n].vs * data[n].hr * data[n].dl;
    return 1;
}

int del_str(struct Data* data, int n) {
    int num, i;

    printf("String to remove: ");
    scanf("%d", &num);
    num--;
    n--;
    for (i = num; i < n; i++)
       data[i] = data[i + 1];

    return 1;
}

void change_str(struct Data* data, int n) {
    int num, v;
    do {
        printf("String to change: ");
        scanf("%u", &num);
        if (num < 1 || num > n)
            printf("Invalid number. Try again\n");
        else
            break;
    } while (1 == 1);
    num--;

    printf("Parameter to change:\n");
    printf("1. NAME\n");
    printf("2. COUNTRY\n");
    printf("3. LENGTH\n");
    printf("4. WIDTH\n");
    printf("5. HEIGHT\n");
    printf("6. FREQUENCY\n");
    printf("7. START PULSE\n");
    printf("8. MASS\n");
    printf("9. PRICE\n");
    do {
        scanf("%u", &v);
        if (v == 1) {
            printf("Enter new value: ");
            scanf("%s", data[num].name);
            break;
        } else if (v == 2) {
            printf("Enter new value: ");
            scanf("%s", data[num].country);
            break;
        } else if (v == 3) {
            printf("Enter new value: ");
            scanf("%f", &data[num].dl);
            break;
        } else if (v == 4) {
            printf("Enter new value: ");
            scanf("%f", &data[num].hr);
            break;
        } else if (v == 5) {
            printf("Enter new value: ");
            scanf("%f", &data[num].vs);
            break;
        } else if (v == 6) {
            printf("Enter new value: ");
            scanf("%u", &data[num].vr);
            break;
        } else if (v == 7) {
            printf("Enter new value: ");
            scanf("%hhu", &data[num].tp);
            break;
        } else if (v == 8) {
            printf("Enter new value: ");
            scanf("%hu", &data[num].m);
            break;
        } else if (v == 9) {
            printf("Enter new value: ");
            scanf("%f", &data[num].gh);
            break;
        } else {
            printf("Invalid number. Try again\n");
            continue;
        }
    } while (1 == 1);
}

void save_table(struct Data* data, int n, char* fn) {
    int i;
    FILE* fp = fopen(fn, "w");
    if (!fp) {
        printf("Can't open file\n");
        return;
    }
    fprintf(fp, "%d\n", n);

    for (i = 0; i < n; i++)
        fprintf(fp, "%s %s %f %f %f %u %hhu %hu %f\n", data[i].name, data[i].country, data[i].dl, data[i].hr, data[i].vs, data[i].vr, data[i].tp, data[i].m, data[i].gh);

    fclose(fp);
}

int main()
{
    struct Data data[100];
    int n, v;
    system("chcp 1251");
    n = load_table(data, "database.txt");

    printf("Welcome to Tesla electroengines catalogue:\n");
    printf("1. Print table\n");
    printf("2. Add string\n");
    printf("3. Remove string;\n");
    printf("4. Change string\n");
    printf("5. Save and exit\n");
    do {
        printf("What you want?\n");
        scanf("%d", &v);
        if (v == 1) {
            print_table(data, n);
        } else if (v == 2) {
            n += add_str(data, n);
        } else if (v == 3) {
            n -= del_str(data, n);
        } else if (v == 4) {
            change_str(data, n);
        } else if (v == 5) {
            save_table(data, n, "database.txt");
            printf("Thanks!\n");
        } else {
            printf("Invalid number. Try again\n");
        }
    } while (v != 5);

    system("pause");
    return 0;
}