#include <stdio.h>

struct customerData {
	int ID;
	char Name[50];
	char LastName[50];
	char Email[50];
	char Phone[20];
	char Gender[2];
};

void createFile();
void addRecord();
void loadRecord();
void modifyRecord();
void deleteRecord();
void searchRecord();
void exit();


void main()
{
	FILE *cfPtr;
	int Choice = 0;
	int MaxChoices = 7;

	while (Choice < MaxChoices)
	{
		printf("\n\n");
		printf("--------------------------------- MAIN MENU ---------------------------------\n\n");
		printf("                  Please Enter one of the following Choices\n\n");
		printf("--------------------------- Random File Processing --------------------------\n\n\n");
		printf("1 - Create a Random file\n"
			"2 - Add record inside the file\n"
			"3 - Search racord\n"
			"4 - Modify record\n"
			"5 - Load file\n"
			"6 - Delete Record\n"
			"7 - Exit program\n ");
		printf("-----------------------------------------------------------------------------");
		printf("\n\n");

		// Print Your choices here
		scanf("%d", &Choice);

		switch (Choice)
		{
		case 1:
			createFile();
			break;

		case 2:
			addRecord();
			break;

		case 3:
			searchRecord();
			break;

		case 4:
			modifyRecord();
			break;

		case 5:
			loadRecord();
			break;

		case 6:

			break;

		case 7:
			exit();
			break;
		}
	}
}

//Not in Menu


bool FileExists(const char* name)
{
	if (FILE *file = fopen(name, "r")) {
		fclose(file);
		return true;
	}
	else {
		return false;
	}
}
//Case 1 -----> Create Blank Document
void createFile() {

	if (FileExists("customer.dat"))
	{
		char Answer;
		printf("This Random File already exists!\n");
		printf("Write 'y' or 'Y' if you want to reset it\n");
		// if you ever wanted to get a character using scanf and the computer
		// skips over it, then flush the keyboard buffer
		fflush(stdin);
		scanf("%c", &Answer);
		if (Answer != 'Y' && Answer != 'y')
		{
			return;
		}
	}

	int i;
	struct customerData blankCustomer = { 0, "", "", "", "", "" };

	FILE *cfPtr;

	if ((cfPtr = fopen("customer.dat", "w")) == NULL)
		printf("File could not be opened.\n");
	else {
		for (i = 1; i <= 1000; i++)
			fwrite(&blankCustomer,
				sizeof(struct customerData), 1, cfPtr);

		fclose(cfPtr);
		printf("File was succesfully created!\n");
	}
	return;
}
//Case 2 -----> Add Record inside File
void addRecord() {
	FILE *cfPtr;
	struct customerData customer;

	if ((cfPtr = fopen("customer.dat", "r+")) == NULL)
	{
		printf("File could not be opened.\n");
	}

	else {
		printf("Enter customer ID. Use numbers from 1 to 1000. Use 0 to exit this option:\n ");
		scanf("%d", &customer.ID);

		/*while (customer.ID != 0) */ {
			printf("Enter first name: \n ");
			scanf("%s", &customer.Name);

			printf("Enter last name: \n ");
			scanf("%s", &customer.LastName);

			printf("Enter email: \n ");
			scanf("%s", &customer.Email);

			printf("Enter phone number: \n ");
			scanf("%s", &customer.Phone);

			printf("Enter gender(M or F): \n ");
			scanf("%s", &customer.Gender);

			fseek(cfPtr, (customer.ID - 1) * sizeof(struct customerData), SEEK_SET);

			//write the info one time in the document.
			fwrite(&customer, sizeof(struct customerData), 1, cfPtr);
			/*printf("Enter customer ID\n ? ");
			scanf("%d", &customer.ID);*/
		}
	}

	fclose(cfPtr);
	printf("Saved succesfully in random file!\n");

	return;
}

//Case 3 -----> Search Record

void searchRecord()
{
	int findID;
	FILE *cfPtr;
	struct customerData customer;

	if ((cfPtr = fopen("customer.dat", "r+")) == NULL)
	{
		printf("File could not be opened.\n");
	}
	else
	{
		printf("Enter customer ID to upload records: \n ");
		scanf("%d", &findID);
	}
	fseek(cfPtr, (findID - 1) * sizeof(struct customerData),
		SEEK_SET);
	fread(&customer, sizeof(struct customerData), 1, cfPtr);

	if (customer.ID == 0)
		printf("There is no ID #%d in the system.\n", findID);
	else {
		printf("%-8d%-20s%-25s%-30s%-25s%-10s%\n",
			customer.ID, customer.Name, customer.LastName, customer.Email, customer.Phone, customer.Gender);
	}
}

//Case 4 -----> Modify Record

void modifyRecord()
{
	int findID;
	FILE *cfPtr;
	struct customerData customer;

	if ((cfPtr = fopen("customer.dat", "r+")) == NULL)
	{
		printf("File could not be opened.\n");
	}
	else
	{
		printf("Enter customer ID to upload records: \n ");
		scanf("%d", &findID);
	}
	fseek(cfPtr, (findID - 1) * sizeof(struct customerData),
		SEEK_SET);
	fread(&customer, sizeof(struct customerData), 1, cfPtr);

	if (customer.ID == 0)
		printf("There is no ID #%d in the system.\n", findID);
	else {
		printf("%-8d%-20s%-25s%-30s%-25s%-10s%\n",
			customer.ID, customer.Name, customer.LastName, customer.Email, customer.Phone, customer.Gender);

		printf("Enter first name: \n ");
		scanf("%s", &customer.Name);

		printf("Enter last name: \n ");
		scanf("%s", &customer.LastName);

		printf("Enter email: \n ");
		scanf("%s", &customer.Email);

		printf("Enter phone number: \n ");
		scanf("%s", &customer.Phone);

		printf("Enter gender(M or F): \n ");
		scanf("%s", &customer.Gender);

		printf("%-8d%-20s%-25s%-30s%-25s%-10s%\n",
			customer.ID, customer.Name, customer.LastName, customer.Email, customer.Phone, customer.Gender);

		fseek(cfPtr, (customer.ID - 1) * sizeof(struct customerData),
			SEEK_SET);
		fwrite(&customer, sizeof(struct customerData), 1, cfPtr);
	}
}




//Case 6 -----> Load Record
void loadRecord()
{
	FILE *cfPtr;
	struct customerData customer;

	if ((cfPtr = fopen("customer.dat", "r")) == NULL)
		printf("File could not be opened.\n");
	else
	{
		printf("%-8s%-20s%-25s%-30s%-25s%-10s%\n", "ID", "First Name", "Last Name", "Email", "Phone", "Gender");


		while (!feof(cfPtr)) {
			fread(&customer, sizeof(struct customerData), 1, cfPtr);

			if (customer.ID != 0)
				printf("%-8d%-20s%-25s%-30s%-25s%-10s%\n",
					customer.ID, customer.Name, customer.LastName, customer.Email, customer.Phone, customer.Gender);
		}
	}

	fclose(cfPtr);

	return;
}



void exit()
{
	return;
}