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

char* registeredClientDatabase[50][12];
char* pendingClientDatabase[50];
char empty[50] = "null";

void adminLogin();
void clientRegister();
char passwordConversion(char username[50]);


int main(int argc, char *argv[]){

    char selection[50];

    char action[50];
    int i, j;

    for(i = 0; i < 50; i++)
    {
        for(j = 0; j < 12; j++)
        {
            registeredClientDatabase[i][j] = empty;
        }
    }

    for(i = 0; i < 50; i++)
    {
        for(j = 0; j < 2; j++)
        {
            pendingClientDatabase[i][j] = empty;
        }
    }

    do
    {

        printf("Welcome to the Home Screen");

        do
        {
            printf("What would you like to log in as?\n");
            printf("Please type 'Admin' to log in as an admin: \n");
            printf("Please type 'Client' to log in as a client: \n");
            scanf(" %s", &selection);
        }
        while((strcmp(selection, "Admin") != 0) || (strcmp(selection, "Client") != 0));

        if(strcmp(selection, "Admin") == 0)
        {
            printf("Welcome to the admins' login screen: \n");

            adminLogin();

            do
            {

            }
            while(strcmp(action, "Exit") != 0);
        }
        else
        {
            printf("Welcome to the clients' login screen: \n");

            char clientAction[50];

            do
            {
                printf("Would you like to Login or Register? \n");
                printf("Please type 'Login' to login: \n");
                printf("Please type 'Register' to register: \n");
                scanf(" %s", &clientAction);
            }
            while((strcmp(clientAction, "Login") != 0) || (strcmp(clientAction, "Register") != 0));

            if(strcmp(clientAction, "Register") == 0)
            {
                clientRegister();
            }
            else
            {
                int loginFlag = 0;
                char registerUsername[50];

                printf("Please type in your username: \n");
                scanf(" %s", &registerUsername);

                for(i = 0; i < 50; i++)
                {
                    if(strcmp(registerUsername, registeredClientDatabase[i][1]) == 0)
                    {
                        loginFlag = 1;
                        registeredClientDatabase[i][2] = passwordConversion(registerUsername);
                    }
                }

                if(loginFlag = 1)
                {

                }
                else
                {
                    printf("We're sorry but the username that you have provided does not exist in our database of registered clients \n");
                }
            }

        }
    }
    while(strcmp(action, "Skata") != 0);

return 0;
}

void adminLogin()
{
    char username[50];
    char password[50];

    do
    {
        printf("Please provide the admin's username: \n");
        scanf(" %s", &username);
    }
    while(strcmp(username, "admin") != 0);

    do
    {
        printf("Please provide the admin's password: \n");
        scanf(" %s", &password);
    }
    while(strcmp(password, "pizza") != 0);
}

void clientRegister()
{
    char username[50];
    int flag;
    int i;

    do
    {
        flag = 1;
        printf("Please choose your username: \n");
        scanf(" %s", &username);

        for(i = 0; i < 50; i++)
        {
            if((strcmp(username, pendingClientDatabase[i]) == 0) || (strcmp(username, registeredClientDatabase[i][1]) == 0))
            {
                flag = 0;
            }
        }
    }
    while(flag == 0);

    for(i = 0; i < 50; i++)
    {
        if((flag == 1) && (strcmp(pendingClientDatabase[i], empty) == 0))
        {
            pendingClientDatabase[i] = username;
            flag = 0;
        }
    }
}

char passwordConversion(char username[50])
{
    char lowerCaseLetters[26] = {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'};
    char CapsLetters[26] = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'};

    char password[50];
    int i = 0, j =0;
    int letterCheck = 3;

    while(username[i] != '\0')
    {
        for(j = 0; j < 26; j++)
        {
            if(username[i] == lowerCaseLetters[j])
            {
                if(letterCheck % 2 == 1)
                {
                    password[i] = CapsLetters[j];
                }
                else
                {
                    password[i] = lowerCaseLetters[j];
                }
                letterCheck = letterCheck + 1;
            }
        }
    }

    return password;
}