UpdateAndDelete.h

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "create.h"
#define MAX_LINE_SIZE 256
#define MAX_NAME_SIZE 100

struct product {
    char Name[MAX_NAME_SIZE];
    char Brand[MAX_NAME_SIZE];
    char ProducType[MAX_NAME_SIZE];
    int AmountInStorage;
    float Price;
    char ExpireDate[MAX_LINE_SIZE];
};

//The delete function by Pasin Shinwasusin 66070503439
int Delete(const char *filename, int i, int Status) {

    int Validity = 0, DeleteOrNot;

    while (!Validity) {
        printf("Press 0 to exit delete mode and press 1 to delete: ");

        if (scanf("%d", &DeleteOrNot) == 1 && DeleteOrNot == 0 || DeleteOrNot == 1) {
            Validity = 1;
        } else {

            while (getchar() != '\n');

            printf("You can only input either 0 or 1. Try again.\n");
        }

    }

    if (DeleteOrNot == 0) {

        return 1;

    } else {
        // Delete a row from a CSV file
        FILE *inputFile = fopen(filename, "r");
        FILE *outputFile = fopen("temp.csv", "w");

        if (inputFile == NULL || outputFile == NULL) {
            perror("Error opening files");
            exit(EXIT_FAILURE);
        }

        char line[MAX_LINE_SIZE];
        int currentRow = 0;

        while (fgets(line, sizeof(line), inputFile) != NULL) {
            if (currentRow != i + 1) {
                fputs(line, outputFile);
            }
            currentRow++;
        }

        fclose(inputFile);
        fclose(outputFile);

        // Rename the temporary file to the original file
        remove(filename);
        rename("temp.csv", filename);


        printf("Deleted.\n");
    }

    return 0;

}

//A part of the update function by Karun Tancharoen 66070503407
void UpdateFile(int Num, struct product Product[]) {
    FILE *File = fopen("priceyCosmetics.csv", "w");
    int i;

    if (File == NULL) {
        perror("Error opening file.");
        exit(EXIT_FAILURE);
    }

    fprintf(File, "Name,Brand,ProductType,AmountInStorage,Price,ExpireDate\n");

    for (i = 0; i < Num; i++) {
        fprintf(File, "%s,%s,%s,%d,%.2f,%s", Product[i].Name, Product[i].Brand, Product[i].ProducType, Product[i].AmountInStorage, Product[i].Price, Product[i].ExpireDate);
    }

    fclose(File);
}

//A part of the update function by Karun Tancharoen 66070503407
void UpdateStruct(struct product Product[], int Status, int i) {
    int Validity = 0, WhatToEdit, EditOrExit;

    if (Status == 1) {

        while (!Validity) {
            printf("Input the number corresponding to data you want to edit: ");

            if (scanf("%d", &WhatToEdit) != 1) {

                while (getchar() != '\n');

                printf("Invalid input. Input again.\n");
                continue;
            }

            if (WhatToEdit == 1) {

                while (getchar() != '\n');

                Validity = 1;
                printf("New name: ");
                scanf("%[^\n]", Product[i].Name);
            } else if (WhatToEdit == 2) {
                
                while (getchar() != '\n');

                Validity = 1;
                printf("New brand: ");
                scanf("%[^\n]", Product[i].Brand);
            } else if (WhatToEdit == 3) {
                
                while (getchar() != '\n');

                Validity = 1;
                printf("New type: ");
                scanf("%[^\n]", Product[i].ProducType);
            } else if (WhatToEdit == 4) {

                while (!Validity) {
                    printf("New quantity: ");

                    if (scanf("%d", &Product[i].AmountInStorage) == 1) {
                        Validity = 1;
                    } else {
                        
                        while (getchar() != '\n');

                        printf("You can only input an integer. Input again.\n");
                    }

                }

            } else if (WhatToEdit == 5) {
                
                while (!Validity) {
                    printf("New price: ");

                    if (scanf("%f", &Product[i].Price) == 1) {
                        Validity = 1;
                    } else {
                        
                        while (getchar() != '\n');

                        printf("You can only input a float number. Input again.\n");
                    }

                }

            } else if (WhatToEdit == 6) {

                while (getchar() != '\n');

                char Temp[MAX_NAME_SIZE];
                int Length;
                printf("New expire: ");
                scanf("%[^\n]", Product[i].ExpireDate);
                strcpy(Temp, Product[i].ExpireDate);

                while (isExpireDateFormatValid(Temp) == -1 || isExpireDateExists(Temp) == -1) {

                    while (getchar() != '\n');

                    printf("New expire: ");
                    scanf("%[^\n]", Product[i].ExpireDate);
                    strcpy(Temp, Product[i].ExpireDate);
                }

                Length = strlen(Product[i].ExpireDate);
                Product[i].ExpireDate[Length] = '\n';
                Validity = 1;
            } else {

                while (getchar() != '\n');

                printf("Invalid input. Input again.\n");
            }

        }

        Validity = 0;

        while (!Validity) {
            printf("Data was processed successfully. Press 0 to exit the editing mode and 1 to continue editing: ");

            if (scanf("%d", &EditOrExit) == 1 && EditOrExit == 0 || EditOrExit == 1) {
                Validity = 1;
            } else {
                
                while (getchar() != '\n');

                printf("You can only input either 0 or 1. Try again.\n");
            }

        }

        if (EditOrExit == 1) {

            UpdateStruct(Product, Status, i);

        }

    } else {

        while (!Validity) {
            printf("New quantity: ");

            if (scanf("%d", &Product[i].AmountInStorage) == 1) {
                Validity = 1;
            } else {
                
                while (getchar() != '\n');

                printf("You can only input an integer. Input again.\n");
            }

        }

        printf("Data was processed successfully.\n");
    }
}

//The update function by Karun Tancharoen 66070503407
int Update(int Status, int Num, struct product Product[], const char *filename) {
    char SearchedProduct[MAX_NAME_SIZE];
    int NextOrEdit, FoundAResult, i;

    while (getchar() != '\n');

    printf("Which product do you wish to edit its data: ");
    scanf("%[^\n]", SearchedProduct);

    for (i = 0; i < Num; i++) {
        int Validity = 0;

        if (strstr(Product[i].Name, SearchedProduct) != NULL) {
            FoundAResult = 1;
            printf("Found a result.\n");
            printf("1: Name: %s\n", Product[i].Name);
            printf("2: Brand: %s\n", Product[i].Brand);
            printf("3: Type: %s\n", Product[i].ProducType);
            printf("4: Quantity: %d\n", Product[i].AmountInStorage);
            printf("5: Price: %.2f\n", Product[i].Price);
            printf("6: Expire: %s", Product[i].ExpireDate);

            while (!Validity) {
                int BackFromDelete = 0;

                if (i == 99) {
                    printf("\nPress 0 to view the next result, 1 to edit this result, and 2 to delete this result: ");
                } else {
                    printf("Press 0 to view the next result, 1 to edit this result, and 2 to delete this result: ");
                }

                if (scanf("%d", &NextOrEdit) == 1 && NextOrEdit == 0 || NextOrEdit == 1 || NextOrEdit == 2) {

                    if (NextOrEdit == 2) {

                        if (Status == 1) {
                            BackFromDelete = Delete(filename, i, Status);

                            if (BackFromDelete == 0) {
                                
                                return 0;
                                
                            }

                        } else {
                            printf("Only the admin can delete.\n");
                        }

                    } else {
                        Validity = 1;
                    }

                } else {

                    while (getchar() != '\n');

                    printf("You can only input 0, 1, or 2. Try again.\n");
                }

            }

            if (NextOrEdit == 0) {

                while (getchar() != '\n');

                continue;
            } else {

                UpdateStruct(Product, Status, i);

                UpdateFile(Num, Product);

                Validity = 0;
                NextOrEdit = 2;

                while (!Validity) {
                    printf("Data updated successfully. Press 0 to exit and 1 to view the next result: ");

                    if (scanf("%d", &NextOrEdit) == 1 && NextOrEdit == 0 || NextOrEdit == 1) {
                        Validity = 1;
                    } else {

                        while (getchar() != '\n');

                        printf("You can only input either 0 or 1. Try again.\n");
                    }

                }

                if (NextOrEdit == 0) {

                    return 0;

                } else {

                    while (getchar() != '\n');
                    
                    continue;
                }

            }

        }

    }

    if (FoundAResult == 0) {
        printf("No more results found.\n");

        Update(Status, Num, Product, filename);

    }

    return 0;
    
}