HOMEWORK2

/**
 * File:     HW2_Nikita_Mikhalchenko_185014MVEB.c
 * Author:   Nikita Mikhalchenko
 * Created:  19.11.2019
 * Edited:   19.11.2019
 *
 * Description:
 */

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

#define LEN_MAX 30

typedef struct{
	int bookID;
	char title[LEN_MAX];
	char author[LEN_MAX];
	int year;
	float self_cost;
	float sell_price;
}book;

typedef struct{
	int inventoryID;
	int bookID;
	int shelfN;
	int stock;
}inventory;

book * ReadFile1(int *);
inventory * ReadFile2(int *);
void show(book *books, inventory *catalogue, int bNum);
void edit1(book *books, inventory *catalogue, int bNum);
void edit2(book *books, inventory *catalogue, int bNum);
void find(book *books, inventory *catalogue, int bNum);

int main(void){
	int bNum = 0, cNum = 0;
	int ans;

    book *books = ReadFile1(&bNum);
    inventory *catalogue = ReadFile2(&cNum);

    do{
        printf("\nChose from following: 1 - show all, 2 - edit book");
        printf("title, 3 - edit shelf number, 4 - find books");
        printf("less than N, 0 - exit: ");
        scanf("%d", &ans);
        printf("\n");
        if(ans == 1){
			show(books, catalogue, bNum);
        }else if(ans == 2){
            edit1(books, catalogue, bNum);
        }else if(ans == 3){
			edit2(books, catalogue, bNum);
		}else if(ans == 4){
			find(books, catalogue, bNum);
		}
    }while(ans != 0);

    free(books);
    free(catalogue);
	return 0;
}

/**
 * Here the program is reading first input file
 */
book * ReadFile1(int *bNum){

    FILE *fp = fopen("HW2_Nikita_Mikhalchenko_185014MVEB_input1.txt",
                                                                   "r");
    book *file1;

    if (fp == NULL){
		printf( "Error opening file1\n" );
        exit(2);
    }

    if((file1 = (book *)malloc(sizeof(book))) == NULL)
    {
        printf("ERROR: malloc books\n");
        exit(1);
    }
    while(fscanf(fp, "%d %s %s %d %f %f", &file1[*bNum].bookID,
    file1[*bNum].title, file1[*bNum].author, &file1[*bNum].year,
    &file1[*bNum].self_cost, &file1[*bNum].sell_price) == 6 ){
		(*bNum)++;
		if((file1 = (book*)realloc(file1, sizeof(book)*((*bNum)+1))) == NULL)
		{
			printf("ERROR: realloc prod\n");
			exit(1);
		}
    }
    fclose(fp);
    return(file1);
}

/**
 * Here the program is reading second input file
 */
inventory * ReadFile2(int *cNum){
	FILE *fp = fopen("HW2_Nikita_Mikhalchenko_185014MVEB_input2.txt",
	                                                               "r");
    inventory *file2;

    if (fp == NULL){
		printf( "Error opening file2\n" );
        exit(2);
    }

    if((file2 = (inventory *)malloc(sizeof(inventory))) == NULL)
    {
        printf("ERROR: malloc books\n");
        exit(1);
    }
    while(fscanf(fp, "%d %d %d %d", &file2[*cNum].inventoryID,
    &file2[*cNum].bookID, &file2[*cNum].shelfN,
    &file2[*cNum].stock) == 4){
		(*cNum)++;
		if((file2 = (inventory*)realloc(file2, sizeof(inventory)*((*cNum)+1))) == NULL)
		{
			printf("ERROR: realloc prod\n");
			exit(1);
		}
    }
    fclose(fp);
    return(file2);
}

void show(book *books, inventory *catalogue, int bNum)
{
    FILE *outf = fopen("out.txt", "w");
    for(int i = 0; i < bNum ; i++){
			if(books[i].bookID == catalogue[i].bookID){
            printf("%6d %s %s %d %.2f %.2f %d %d %d\n", books[i].bookID,
            books[i].title, books[i].author, books[i].year,
            books[i].self_cost, books[i].sell_price,
            catalogue[i].inventoryID, catalogue[i].shelfN,
            catalogue[i].stock);
            fprintf(outf, "%d %s %s %d %.2f %.2f %d %d %d", books[i].bookID,
            books[i].title, books[i].author, books[i].year,
            books[i].self_cost, books[i].sell_price,
            catalogue[i].inventoryID, catalogue[i].shelfN,
            catalogue[i].stock);
        }
    }
    fclose(outf);
}

void edit1(book *books, inventory *catalogue, int bNum){
	int ID;
	char bName[LEN_MAX];
	FILE *fp = fopen("HW2_Nikita_Mikhalchenko_185014MVEB_input1.txt",
	                                                               "r");
	printf("Enter the BookID to change book title: ");
	scanf("%d", &ID);
	printf("Enter the new name: ");
	scanf("%s", bName);

	fclose(fp);
}

void edit2(book *books, inventory *catalogue, int bNum){
	int ID;
	int sNum;
	FILE *fp = fopen("HW2_Nikita_Mikhalchenko_185014MVEB_input2.txt",
	                                                               "r");
	printf("Enter the inventoryID to change inventory shelf: ");
	scanf("%d", &ID);
	printf("Enter the new shelf number: ");
	scanf("%d" &sNum);

	fclose(fp);
}

void find(book *books, inventory *catalogue, int bNum){
	int N;
	FILE *outf = fopen("out2.txt", "w");
	printf("Enter the number to find books that have less pieces left: ");
	scanf("%d", &N);
    for(int i = 0; i < bNum ; i++){
		if(catalogue[i].stock < N){
			if(books[i].bookID == catalogue[i].bookID){
            printf("%6d %s %s %d %.2f %.2f %d %d %d\n", books[i].bookID,
            books[i].title, books[i].author, books[i].year,
            books[i].self_cost, books[i].sell_price,
            catalogue[i].inventoryID, catalogue[i].shelfN,
            catalogue[i].stock);
            fprintf(outf, "%d %s %s %d %.2f %.2f %d %d %d", books[i].bookID,
            books[i].title, books[i].author, books[i].year,
            books[i].self_cost, books[i].sell_price,
            catalogue[i].inventoryID, catalogue[i].shelfN,
            catalogue[i].stock);
            }
        }
    }
    fclose(outf);

}