Merge branch 'feature/update-current-customer-account-balance' into feature/withdraw-money-system

.gitignore

@@ -1 +1,2 @@
 .DS_Store
+.vscode

src/CustomerData.txt

@@ -0,0 +1,20 @@
+1234=example
+ID=1234
+forename=Max
+Surname=Mustermann
+password=example
+balance=5000
+
+1327=example
+ID=1327
+forename=Max
+Surname=Mustermann
+password=example
+balance=1500
+
+1666=example
+ID=1666
+forename=Max
+Surname=Mustermann
+password=example
+balance=240

src/CustomerProperties.h

@@ -0,0 +1,4 @@
+typedef struct Customer{
+	char *ID, *forename, *surname, *password;
+	float balance;
+}customer_t;

src/LoginCustomer.c

@@ -0,0 +1,97 @@
+#include "LoginCustomer.h"
+
+bool checkLogin(bool loginSuccessful)
+{	
+	return (loginSuccessful) ? true : false;
+}
+
+void collectCustomerDataForLogin(int attempts)
+{
+	customer_t c;
+	c.ID = calloc(15+1,sizeof(char));
+	c.password = calloc(15+1, sizeof(char));
+	char digitCharacterFromUser, passwordCharacterFromUser;
+	int IDLengthCounter = 0, passwordLengthCounter = 0;
+	const int IDMaxLength = 16, passwordMaxLength = 16;
+	
+	printf("Enter ID:\n");
+	while(((digitCharacterFromUser=getchar()) != '\n')&&IDLengthCounter<IDMaxLength){
+			if(digitCharacterFromUser>='0'&&digitCharacterFromUser<='9'){
+				*(c.ID+IDLengthCounter) = digitCharacterFromUser;
+			}
+			else{
+				printf("Character entered is not a digit. Aborting.\n");
+				exit(-1);
+			}
+		++IDLengthCounter;	
+	}
+	*(c.ID+IDLengthCounter) = '\0';
+	
+	if(IDLengthCounter>=IDMaxLength){
+		printf("ID entered is too long. Aborting.\n");
+		exit(-1);
+	}
+
+	printf("Enter password:\n");
+	while((passwordCharacterFromUser=getchar())!='\n'&&passwordLengthCounter<passwordMaxLength){
+		*(c.password+passwordLengthCounter) = passwordCharacterFromUser;
+		++passwordLengthCounter;
+	}
+	*(c.password+passwordLengthCounter) = '\0';
+	
+	if(passwordLengthCounter>=passwordMaxLength){
+		printf("Password entered is too long. Aborting.\n");
+		exit(-1);
+	}
+	customer_t *ptr = &c;
+	bool loginSuccessful = loginCustomer(ptr);
+	if(loginSuccessful ) {
+		printf("Welcome to the menu!\n");
+		//call menu()
+	}else if(!loginSuccessful && attempts < MAX_LOGIN_ATTEMPTS){
+		printf("You have %d attempts left.\n", MAX_LOGIN_ATTEMPTS - attempts);
+		collectCustomerDataForLogin(++attempts);
+	}else{
+		printf("Maximum number of attempts reached. Program terminates.\n");
+		exit(-1);
+		//call error()
+	}
+	
+}
+
+bool loginCustomer(customer_t *c)
+{
+	bool foundCustomerEntryInFile = false;
+	char *searchForThisString = generateCheckString(c->ID,c->password);
+	char *lineFromCustomerFile = calloc(40,sizeof(char));
+	FILE *readCustomerFile = fopen("CustomerData.txt", "r");
+	if(readCustomerFile==NULL){
+		printf("Could not find file. Aborting.\n");
+		exit(-1);
+		//call error()
+	}
+	while((fscanf(readCustomerFile,"%s",lineFromCustomerFile)!=EOF)){
+			if(strcmp(searchForThisString,lineFromCustomerFile)==0){
+				foundCustomerEntryInFile = true;
+				break;
+			}
+	}
+	
+	if(checkLogin(foundCustomerEntryInFile)){
+		printf("Login successful.\n");
+		return foundCustomerEntryInFile;
+	}else{
+		printf("Login not successful.\n");
+	}
+	fclose(readCustomerFile);
+	return foundCustomerEntryInFile;
+}
+
+char *generateCheckString(char *ID, char *password){
+	int checkStringLength = strlen(ID) + 1 + strlen(password) + 1;
+	char *checkString = calloc(checkStringLength, sizeof(char));
+	checkString = strcat(ID,"=");
+	checkString = strcat(checkString,password);
+	*(checkString+checkStringLength) = '\0';
+	return checkString;
+}

src/LoginCustomer.h

@@ -0,0 +1,10 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <string.h>
+#include "CustomerProperties.h"
+#define MAX_LOGIN_ATTEMPTS 3
+char *generateCheckString(char *, char*);
+bool checkLogin(bool);
+void collectCustomerDataForLogin(int);
+bool loginCustomer(customer_t *);

src/_file_information.h

@@ -0,0 +1,2 @@
+#define MAX_LENGTH 100
+#define CUSTOMER_DATA_FILE "CustomerData.txt"

src/currentCustomerAccountBalance.c

@@ -0,0 +1,63 @@
+#include "currentCustomerAccountBalance.h"
+
+float fetchBalanceFromBalanceString(char balance_String[MAX_LENGTH]) {
+    float balance = 0;
+    char *token = strtok(balance_String, "="); // separates string to two parts
+    while (token != NULL) {
+        if (atoi(token) != 0) {
+            balance = atof(token); // converts string to float
+            break;
+        }
+        token = strtok(NULL, "=");
+    }
+    return balance;
+}
+
+float readFileAndGetAvailableBalance(FILE *file, char stringID[MAX_LENGTH]) {
+    float balance = 0;
+    bool keep_reading = true;
+    char buffer[MAX_LENGTH];
+    char balance_String[MAX_LENGTH];
+
+    while(keep_reading) {
+        fgets(buffer, MAX_LENGTH, file);
+        if (feof(file)) {
+            keep_reading = false;
+        }
+        else if(strstr(buffer, stringID)) {
+            for (int i = 0; i < 4; i++) {
+                fgets(buffer, MAX_LENGTH, file);
+            }
+            strcpy(balance_String, buffer);
+            balance = fetchBalanceFromBalanceString(balance_String);
+            keep_reading = false;
+        }
+
+    }
+    return balance;
+}
+
+float getAvailableAccountBalance(int user_id) {
+    float availableBalance = 0;
+    char stringID[MAX_LENGTH] = "ID=";
+    char user_id_as_string[MAX_LENGTH];
+
+    sprintf(user_id_as_string, "%d", user_id); // converts user_id to string
+    strcat(stringID, user_id_as_string);
+    // Now stringID is "ID=user_id"
+
+    FILE *file = fopen(CUSTOMER_DATA_FILE, "r"); 
+    if(file == 0) {
+        printf("Error: customer data file cannot be opened!\n");
+        return 0;
+    }
+    else {
+        availableBalance = readFileAndGetAvailableBalance(file, stringID);
+    }
+
+    
+    fclose(file);
+    
+    return availableBalance;
+    
+}

src/currentCustomerAccountBalance.h

@@ -0,0 +1,10 @@
+#include <stdio.h>
+#include <stdbool.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include "_file_information.h"
+
+float getAvailableAccountBalance(int user_id);
+float fetchBalanceFromBalanceString(char balance_String[MAX_LENGTH]);
+float readFileAndGetAvailableBalance(FILE *file, char stringID[MAX_LENGTH]);

src/lineReplacer.h

@@ -0,0 +1,6 @@
+#include <stdio.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+
+void replaceLineInFile(const char* file_name, int line, const char* new_line); //replaces the line at "line" on the file "file_name", with the new line "new_line".

src/updateCustomerAccountBalance.c

@@ -0,0 +1,81 @@
+#include "updateCustomerAccountBalance.h"
+#include "currentCustomerAccountBalance.c"
+#include "lineReplacer.h"
+
+void replaceLineInFile(const char* file_name, int line, const char* new_line){
+    FILE* file = fopen(file_name, "r");
+    if (file == NULL) {
+        printf("Error opening file!\n");
+        return;
+    }
+    char current_string[1024];
+    int current_line = 1;
+    char *temp_file_name = "temp.txt";
+    FILE* temp_file = fopen(temp_file_name, "w");
+    if (temp_file == NULL) {
+        printf("Error creating temp file!\n");
+        fclose(file);
+        return;
+    }
+    while (fgets(current_string, sizeof(current_string), file) != NULL) {
+        if (current_line == line) {
+            fprintf(temp_file, "%s", new_line);
+            fputs("\n", temp_file);
+        } else {
+            fprintf(temp_file, "%s", current_string);
+        }
+        current_line++;
+    }
+    fclose(file);
+    fclose(temp_file);
+    if(remove(file_name)!=0){
+        printf("could not remove the original file!");
+    } // Remove the original file
+    if(rename(temp_file_name, file_name)!=0){
+        printf("could not rename!");
+    } // Rename the temp file to the original file
+}
+
+void replaceBalanceInString(float replacementBalance, int currentLine) {
+    char newBalanceLine[MAX_LENGTH] = "balance=";
+    char balance_as_string[MAX_LENGTH];
+    sprintf(balance_as_string, "%g", replacementBalance); //converts replacement balance to string
+    strcat(newBalanceLine, balance_as_string);
+    replaceLineInFile("CustomerData.txt",currentLine,newBalanceLine);
+}
+
+bool updateAvailableAccountBalance(int user_id, float newBalance){
+
+    bool keep_reading = true;
+
+    char buffer[MAX_LENGTH];
+    char stringID[MAX_LENGTH] = "ID=";
+    char user_id_as_string[MAX_LENGTH];
+    char balance_String[MAX_LENGTH];
+    int currentLine=0;
+
+    sprintf(user_id_as_string, "%d", user_id); // converts user_id to string
+    strcat(stringID, user_id_as_string);
+
+    FILE *file = fopen("CustomerData.txt", "r+"); 
+    printf(stringID);
+    while(keep_reading) {
+        fgets(buffer, MAX_LENGTH, file);
+        currentLine++;
+        if (feof(file)) {
+            keep_reading = false;
+        }
+        else if(strstr(buffer, stringID)) { //found the customer
+            fgets(buffer, MAX_LENGTH, file);
+            fgets(buffer, MAX_LENGTH, file);
+            fgets(buffer, MAX_LENGTH, file);
+            fgets(buffer, MAX_LENGTH, file);
+            strcpy(balance_String, buffer);
+            currentLine+=4;
+            keep_reading = false;
+        }
+
+    }
+    fclose(file);;
+    replaceBalanceInString(newBalance,currentLine);
+}

src/updateCustomerAccountBalance.h

@@ -0,0 +1,11 @@
+#include <stdio.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define MAX_LENGTH 100
+
+
+bool updateAvailableAccountBalance(int user_id, float newBalance);
+
+void replaceBalanceInString(float replacementBalance, int currentLine);

team.md

@@ -1,9 +0,0 @@
-# Bankmanagement-System
-
-- Can Hacioglu, Fdlt3817 
-- Atharva Kishor Naik, fdai7514
-- Julius Philipp Engel, fdai7057
-- Shivam Chaudhary, fdlt3781
-- Mohamed Yahya Dahi, fdai6618
-- Haytham Daoula, fdai7207
-

tests/test_LoginCustomer.c

@@ -0,0 +1,21 @@
+#include <unity.h>
+#include "LoginCustomer.h"
+void setUp(){};
+void tearDown(){};
+void test_checkLogin()
+{
+	/*arrange*/
+	bool expected_test_values_compute_to_true[] = {4==4,true==true, 1==1, false==false, 'z'=='z', '='=='=',0x1A==0x1A};
+	int length_1 = sizeof(expected_test_values_compute_to_true)/sizeof(bool);
+
+	bool expected_test_values_compute_to_false[] = {4!=4,true==false,1==0,false==true,'z'=='x','!'==')',0x1A==0x2B};
+	int length_2 = sizeof(expected_test_values_compute_to_false)/sizeof(bool);
+	
+	/*act and assertions*/
+	for(int i=0;i<7;++i) {
+		TEST_ASSERT_TRUE(checkLogin(expected_test_values_compute_to_true[i]));
+	}	
+	for(int i=0;i<7;++i){
+		TEST_ASSERT_FALSE(checkLogin(expected_test_values_compute_to_false[i]));
+	}
+}