FLIGHT.c

//Program to implement flight information system
#include<stdio.h>
#include<stdlib.h>
#include <string.h>
int countuser=0;
int countflight=0;
int countplaces=0;
//creating a structure to store flight details
struct Flight
{
    char flightID[10];
    char source[20];
    char arrivalTime[10];
    char destination[20];
    char departureTime[10];
    float flightTime;
    float fare;
}flights[100];
//creating a structure to store cities
struct city
{
    char cities[20];
}city_list[100];
//creating a structure to store user details
struct userdetails
{
    char username[100];
    char email[100];
    char password[100];
}user[50];
//creating a structure to store the details of cheapest flight
struct cheapestflight
{
    float fare;
    char source[20];
    char stop[20];
    char destination[20];
    char flightID1[10];
    char flightID2[10];
}cheapflight[10];
//Creating prototypes for function
void files();
void userdata();
void userlogin();
void createnewaccount();
void login();
void displayallflights();
void displaysource();
void displaysourcetodesination();
int choice();
//Main function
int main()
{
    int flightn=20;
    //fetching all files
    files();
    userdata();
    //user login
    userlogin();
    //Asking user to select option
    choice();
    return 0;
}
int choice()
{
    int choice;
    do
    {
        printf("Select a option\n");
        printf("1.To check all the flights available.\n");
        printf("2.To check all the flights from one place.\n");
        printf("3.To check all the flights from one place to another place.\n");
        printf("4.Logout\n");
        //To verify user is giving option in intergers
        while((scanf("%d",&choice)!=1))
        {
            while(getchar()!='\n');
            printf("Error in option ,Please type respective option.\n");
        }
        switch(choice)
        {
            case 1:displayallflights();
                   break;
            case 2:displaysource();
                   break;
            case 3:displaysourcetodesination();
                   break;
            case 4:printf("Succefully logged out... :)\n");
            return 0;
            default:printf("Invalid choice\n");
                    break;
        }
    } while (choice!=4);
    return 0;
}
void files()
{
    FILE *fp,*fp2;
    int i=0;
    //opening FLIGHT DETAILS csv file
    fp = fopen("FLIGHTDETAILS.csv", "r");
    if (fp == NULL)
    {
        printf("Error opening file FLIGHT DETAILS");
        return ;
    }
    //opening LOCATION csv file
    fp2 = fopen("PLACES.csv", "r");
    if (fp2 == NULL)
    {
        printf("Error opening file PLACES");
        return ;
    }
    //reading flight details from csv file
    char line1[50];
    while (fgets(line1, sizeof(line1), fp))
    {
        if(sscanf(line1, "%[^,],%[^,],%[^,],%[^,],%[^,],%f,%f", flights[i].flightID, flights[i].source, flights[i].arrivalTime, flights[i].destination,flights[i].departureTime,&flights[i].flightTime,&flights[i].fare) == 7)
        {
            i++;
            countflight++;
        }
    }
    i=0;
    char line2[50];
    //reading city details from csv file
     while (fscanf(fp2, "%s", city_list[i].cities) == 1)
    {
        i++;
        countplaces++;
    }
    //closing files
    fclose(fp);
    fclose(fp2);
}
void userdata()
{
    FILE *fp3;
    fp3 = fopen("Userdetails.csv", "r");
    if (fp3 == NULL)
    {
        printf("Error opening user files");
        return ;
    }
    int i=0;
    //reading user details
    char line3[50];
    while (fgets(line3, sizeof(line3), fp3)!=NULL)
    {
        if(sscanf(line3, "%[^,],%[^,],%[^,]", user[i].username,user[i].email,user[i].password)==3)
         {
            i++;
            countuser++;
        }
    }
    //closing file
    fclose(fp3);
}
//function for user to create a new account or login
void userlogin()
{
    char option;
    for(int j=0;j<60;j++)
        {
            printf("-");
        }
    printf("\n");
    //asking user whether the user hav account or not
    printf("%40s","Welcome to Flight Finder\n");
    printf("%5s","Do you have a travel account with us? [Y/N] ");
    do
    {
            scanf(" %s",&option);
            if (option == 'y' || option == 'Y')
            {
                //if yes asking user to login
                login();
                return;
            }
            else if(option == 'n'|| option == 'N')
            {
                //if no asking user to login
                createnewaccount();
                return;
            }
            else
            {
                //asking user to enter the option if chose any option rather than y or n
                printf("\nERROR: Please type [y/Y] or [n/N]: ");
            }
    }while(1);
    for(int j=0;j<60;j++)
    {
        printf("-");
    }
    printf("\n");
}
//function for user to create a new account
void createnewaccount()
{
    if (countuser>50)
    {
        printf("Maximum number of users reached.\n");
        return;
    }
    char username[100], email[100], password[100];
    for(int j=0;j<60;j++)
    {
        printf("-");
    }
    printf("\n\n%10s","Lets create your new account :)\n");
    do
    {
        name1:
        //asking user to enter their new username
        printf("Enter Your Username: ");
        scanf(" %[^\n]", username);
        getchar();
        // Asking user to keep username more than 3 characters
        if (strlen(username) < 3|| strchr(username,' ')!=NULL)
        {
            printf("Username must be at least 3 characters long and no spaces are allowed\n");
            continue;
        }
        // Checking for duplicate usernames
        for (int i = 0; i < countuser; i++)
        {
            if (strcmp(username, user[i].username) == 0)
            {
                printf("Username already exists. Please choose a different username.\n");
                goto name1;
            }
        }
        // If no issues found break out of the loop
        break;
    } while (1);
    do
    {
        email1:
        printf("Enter your Email Address: ");
        scanf(" %49s", email);
        getchar();
        // email validation
        if (strchr(email, '@') == NULL)
        {
            printf("Invalid email address. Please enter a valid email address.\n");
            continue;
        }
        for (int i = 0; i < countuser; i++)
        {
            if (strcmp(email, user[i].email) == 0)
            {
                printf("Email already exists. Please choose a different email.\n");
                goto email1;
            }
        }
        break;
    } while (1);
    do
    {
        printf("Enter your password: ");
        scanf(" %49[^\n]", password);
        getchar();
        // Basic password validation (you can add more checks)
        if (strlen(password) < 8)
        {
            printf("Password must be at least 8 characters long.\n");
            continue;
        }
        //password validation
    break;
    } while (1);
    strcpy(user[countuser].username, username);
    strcpy(user[countuser].email, email);
    strcpy(user[countuser].password, password);
    countuser++;
    printf("\nAccount created successfully!\n");
    FILE *fp;
    fp = fopen("Userdetails.csv", "a");
    if (fp == NULL)
    {
        printf("Error opening user files");
        return ;
    }
    fprintf(fp,"%s,%s,%s\n", username, email, password);
    for(int j=0;j<60;j++)
    {
        printf("-");
    }
    // Close the file
    fclose(fp);
    printf("\n%10s%s\n","Welcome!! ",username);
    printf("%10s","How may i help you\n");
}
//function for user to login
void login()
{
    if (countuser == 0)
    {
        printf("No user data available. Please create a new account.\n");
        createnewaccount();
        return;
    }
    char name[100], password[100], option;
    int error = 0;
    name2:
    printf("Enter your username or email address:\n");
    scanf("%s", name);
    if (error == 2) {
        printf("Invalid login\n Maximum attempts reached.\n");
        do
        {
            printf("Do You want to create account? [Y/N] ");
            scanf(" %s", &option);
            if (option == 'y' || option == 'Y') {
                createnewaccount();
                return;
            } else if (option == 'n' || option == 'N') {
                printf("Sorry could not verify.\n");
                exit(0);
            } else
            {
                printf("\nERROR: Please type [y/Y] or [n/N]: \n");
            }
        } while (1);
    }
    for (int i = 0; i < countuser; i++)
    {
        if (strcmp(name, user[i].username) == 0 || strcmp(name, user[i].email) == 0)
        {
            // Reset error count for each user
            error = 0;
            while (fgetc(stdin) != '\n' && !feof(stdin));
            password1:
            printf("Enter your password:\n");
            if(fgets(password,sizeof(password),stdin)==NULL)
            {
                printf("Error reading password\n");
                exit(0);
            }
            if (strcasecmp(password, user[i].password) == 0)
            {
                printf("Welcome Back!! %s\n", user[i].username);
                return;
            }
            else
            {
                printf("Wrong password!! Please try again\n");
                error++;
                if (error == 3)
                {
                    printf("Invalid login\nMaximun number of attempts reached\n");
                    do
                    {
                        printf("Do You want to create account? [Y/N] ");
                        scanf(" %s", &option);
                        if (option == 'y' || option == 'Y')
                        {
                            createnewaccount();
                            return;
                        }
                        else if (option == 'n' || option == 'N')
                        {
                            printf("Sorry could not verify.\n");
                            exit(0);
                        }
                        else
                        {
                            printf("\nERROR: Please type [y/Y] or [n/N]: ");
                        }
                    } while (1);
                }
                else
                    {
                    goto password1;
                    }
                }
        }
    }
    printf("Please Enter valid username\n");
    error++;
    goto name2;
}
//function to display all flights
void displayallflights()
{
    //Displaying all flights
    printf("%-10s %-10s %-10s %-10s %-10s %-10s %-10s\n", "Flight ID", "Source", "Arrival", "Destination", "Departure", "Time", "Fare");
    for(int i=0;i<75;i++)
    {
        printf("-");
    }
    printf("\n");
    for (int i = 0; i < countflight; i++)
    {
        printf("%-10s %-10s %-10s %-10s %-10s %-10.2f  %-10.2f\n",
               flights[i].flightID, flights[i].source, flights[i].arrivalTime,
               flights[i].destination, flights[i].departureTime, flights[i].flightTime, flights[i].fare);
    }
      for(int i=0;i<75;i++)
    {
        printf("-");
    }
    printf("\n");
}
//function to display a flight from user given source
void displaysource()
{
    int option;
    //Asking user to select a source
    jump_here1:
    printf("Select the source\n");
    for(int i=0;i<countplaces;i++)
    {
        printf("%d.%s\n",i+1,city_list[i].cities);
    }
    //To verify user is giving option in intergers
    while((scanf("%d",&option)!=1))
    {
        while(getchar()!='\n');
        {
            printf("Error in option ,Please type respective option.\n");
        }
    }
    if(option>countplaces)
    {
        printf("Please Enter different source\n");
        goto jump_here1;
    }
    printf("%s\n",city_list[option-1].cities);
    //Displaying all flights from selected source
    printf("%-10s %-10s %-10s %-10s %-10s %-10s %-10s\n", "Flight ID", "Source", "Arrival", "Destination", "Departure", "Time", "Fare");
    for(int j=0;j<75;j++)
    {
        printf("-");
    }
    printf("\n");
    //Display flights
    for(int i=0;i<countflight;i++)
    {
        if(strcmp(city_list[option-1].cities,flights[i].source)==0)
        {
            printf("%-10s %-10s %-10s %-10s %-10s %-10.2f %-10.2f \n",
                    flights[i].flightID, flights[i].source, flights[i].arrivalTime,
                    flights[i].destination, flights[i].departureTime, flights[i].flightTime, flights[i].fare);
        }
    }
    for(int j=0;j<75;j++)
    {
        printf("-");
    }
        printf("\n");
}
//function to display flights from user given source and destination
void displaysourcetodesination()
{
    int option,option1,verify=0,cheap=0,temp=0;
    float totaltime,totalfare;
    //Asking user to select the source
    jump_here2:
    printf("Select the source\n");
    for(int i=0;i<countplaces;i++)
    {
        printf("%d.%s\n",i+1,city_list[i].cities);
    }
    //To verify user is giving option in intergers
    while((scanf("%d",&option)!=1)||option>countplaces)
    {
        while(getchar()!='\n');
        {
            printf("Error in option ,Please type respective option.\n");
        }
    }
    printf("%s\n",city_list[option-1].cities);
    //Asking user to select destination
    printf("Select the destination\n");
    for(int i=0;i<countplaces;i++)
    {
        if(strcmp(city_list[option-1].cities,city_list[i].cities)==0)
        {
            continue;
        }
        printf("%d.%s\n",i+1,city_list[i].cities);
    }
    //To verify user is giving option in intergers
    while((scanf("%d",&option1)!=1)||option1>countflight)
    {
        while(getchar()!='\n');
        {
            printf("Error in option ,Please type respective option.\n");
        }
    }
    printf("%s\n",city_list[option1-1].cities);
    //Asking user to select different destination
    if(city_list[option-1].cities==city_list[option1-1].cities||option1>=8||option>=8)
    {
        printf("Please Enter correct source and destination\n");
        goto jump_here2;
    }
    //printing direct flights from source to destintation
    printf("%40s\n","DIRECT FLIGHTS");
    printf("%-10s %-10s %-10s %-10s %-10s %-10s %-10s\n", "Flight ID", "Source", "Arrival", "Destination", "Departure", "Time", "Fare");
    for(int j=0;j<75;j++)
    {
        printf("-");
    }
    printf("\n");
    //Display flights
    for(int i=0;i<countflight;i++)
    {
        if(strcmp(city_list[option-1].cities,flights[i].source)==0 && strcmp(city_list[option1-1].cities,flights[i].destination)==0)
        {
            verify=1;
            printf("%-10s %-10s %-10s %-10s %-10s %-10.2f %-10.2f \n",
                    flights[i].flightID, flights[i].source, flights[i].arrivalTime,
                    flights[i].destination, flights[i].departureTime, flights[i].flightTime, flights[i].fare);
        }
    }
    //Displaying no direct files if not available
    if(verify==0)
    {
        printf("\t\t\tNO DIRECT FLIGHTS ):\n");
    }
    for(int j=0;j<75;j++)
    {
        printf("-");
    }
    printf("\n\n");
    verify=0;
    //Displaying Indirect flights
    printf("%40s\n","INDIRECT FLIGHTS");
    printf("%-10s %-10s %-10s %-10s %-10s %-10s %-10s\n", "Flight ID", "Source", "Arrival", "Destination", "Departure", "Time", "Fare");
    for(int j=0;j<75;j++)
    {
        printf("-");
    }
    printf("\n");
    //Display flights
    for(int i=0;i<countflight;i++)
    for(int j=0;j<countflight;j++)
    {
        if(strcmp(city_list[option-1].cities,flights[i].source)==0 && strcmp(flights[j].source,flights[i].destination)==0 && strcmp(city_list[option1-1].cities,flights[j].destination)==0)
        {
            verify=1;
            printf("%s","**FLIGHT 1**\n\n");
            printf("%-10s %-10s %-10s %-10s %-10s %-10.2f %-10.2f \n",
                    flights[i].flightID, flights[i].source, flights[i].arrivalTime,
                    flights[i].destination, flights[i].departureTime, flights[i].flightTime, flights[i].fare);
            printf("%s","\n**FLIGHT 2**\n\n");
            printf("%-10s %-10s %-10s %-10s %-10s %-10.2f %-10.2f \n",
                    flights[j].flightID, flights[j].source, flights[j].arrivalTime,
                    flights[j].destination, flights[j].departureTime, flights[j].flightTime, flights[j].fare);
            totalfare=flights[i].fare+flights[j].fare;
            totaltime=flights[i].flightTime+flights[j].flightTime;
            printf("\n");
            printf("TOTAL TIME = %0.2f hours\n",totaltime);
            printf("TOTAL FARE = Rs. %0.2f\n",totalfare);
            //storing the details of indirect flights
            cheapflight[cheap].fare=totalfare;
            strcpy(cheapflight[cheap].source,flights[i].source);
            strcpy(cheapflight[cheap].stop,flights[i].destination);
            strcpy(cheapflight[cheap].destination,flights[j].destination);
            strcpy(cheapflight[cheap].flightID1,flights[i].flightID);
            strcpy(cheapflight[cheap].flightID2,flights[j].flightID);
            cheap++;
            for(int j=0;j<75;j++)
            {
                printf("-");
            }
        printf("\n");
        }
    }
    //Displaying no Indirect files if not available
    if(verify==0)
    {
        printf("\t\t\tNO INDIRECT FLIGHTS ):\n");
    }
    //if indirect flights are available displaying details of cheapest flight
    else
    {
        for(int i=0;i<cheap-1;i++)
        {
            if(cheapflight[temp].fare>cheapflight[temp+1].fare)
            {
                temp=temp+1;
            }
        }
        printf("\n%40s\n","CHEAPEST INDIRECT FLIGHT");
        for(int j=0;j<75;j++)
        {
            printf("-");
        }
        printf("\n");
        printf("\nFLIGHTID'S: %s, %s\n",cheapflight[temp].flightID1,cheapflight[temp].flightID2);
        printf("\nCHECKPOINTS: %s->%4s->%4s\n",cheapflight[temp].source,cheapflight[temp].stop,cheapflight[temp].destination);
        printf("\nFARE = Rs. %0.2f\n",cheapflight[temp].fare);
    }
    for(int j=0;j<75;j++)
    {
        printf("-"); 
    }
    printf("\n");
}