#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include <time.h>
int atoi(const char *string);
//add more to the sections below if needed-
//declaring all the procedures to be written later:
void check_in(), book_tables(), check_out(),  menu(), display_rooms(), displayCost();
void getCost(int n);
//declaring any constants we will use:
int room_rates[4] = {100, 85, 75, 50};
int board_rates[3] = {20, 15, 5};
//declaring and initiating any global variables we will use:
int rooms[4] = {1, 1, 1, 1};//room one is the 0th element (1 means free 0 booked)
int roomUsed[4]; //room number in correct slot
int tables[2][3] = {{0, 0, 0}, {0, 0, 0}};//Endor, Naboo and Tatooine at 7pm and 9pm respectively
//since there can only be 4 rooms booked and each person has one of those rooms, the variables for the check in function come in fours:
const char* table_names[] = {"Endor", "Naboo", "Tatooine"};
const char *table_time[] = {"7pm", "9pm"};
char names[4][2][12];
char IDs[4][12] = {
        {'A', '1'}, {'B', '2'}, {'C', '3'}, {'D', '4'}
}; //placeholder IDs
int DOB[4][8] = {{0, 0, 0, 0, 0, 0, 0, 0}, {0, 0, 0, 0, 0, 0, 0, 0}, {0, 0, 0, 0, 0, 0, 0, 0}, {0, 0, 0, 0, 0, 0, 0, 0}};
int board_type[4] = {0, 0, 0, 0};//1:FB 2:HB 3:BB
int length[4] = {0, 0, 0, 0};
int numChild[4] = {0,0,0,0}; //number of each type per room
int numAdult[4] = {0,0,0,0};
int numElderly[4] = {0,0,0,0};
int newspaper[4] = {0, 0, 0, 0};
//for check_out
float costNP = 5.5;
float childMultiply = 0.5;
float elderlyMultiply = 0.9;
char currentID[12];
float currentRoom;
int guestPos; //to use as reference in arrays 0-3
float roomCost = 0;
float boardCost = 0;
float tableCost = 0;
float newsCost = 0;
float totalCost = 0;

int freeSpace[4] = {1,1,1,1}; //1 = free, 0 = used
int userPos;

struct guestUser
{
    int inUse; // 0 is free, 1 is taken
    int used;
    char bookingID[12];
    int room;
    int board;
    int length;
    int news; //1 is yes
    int numChild;
    int numAdult;
    int numOld;
};

struct guestUser guest1, guest2, guest3, guest4, guestC, guestE; //c is current, e is empty


int main(void)
{
    guest1.inUse = 0;
    guest2.inUse = 0;
    guest3.inUse = 0;
    guest4.inUse = 0;

    menu();
}
//main menu function
void menu()
{
    int option = 1;
    printf("Menu Options, press:\n1 for checking in\n2 for table booking\n3 for checking out\n4 for exit\n");
    fflush(stdin);
    scanf("%d", &option);
    switch (option)
    {
        case 1:
            check_in();
            break;
        case 2:
            book_tables();
            break;
        case 3:
            check_out();
            break;
        case 4:
            break;
        default:
            printf("That wasn't an option");
            menu();
    }
}
//check in function
void check_in()
{
    //temporary variables to store the user input before it is integrated into the global database
    char first_name[12], second_name[12], date_of_birth[8];
    int num_children = 0, num_adults = 0, num_elderly = 0, room = 0, daily_newspaper = 0;

    if(guest1.inUse ==0)
    {
        guest1.inUse = 1;
        guestC = guest1;
        guestC.used = 1;
    }
    else if(guest2.inUse==0)
    {
        guest2.inUse = 1;
        guestC = guest2;
        guestC.used = 2;
    }
    else if(guest3.inUse ==0)
    {
        guest3.inUse = 1;
        guestC = guest3;
        guestC.used = 3;
    }
    else if(guest4.inUse==0)
    {
        guest4.inUse = 1;
        guestC = guest4;
        guestC.used = 4;
    }
    else
    {
        printf("fully booked");
        menu();
    }

    //getting and saving relevant data
    printf("Please enter your first name:\n");
    fflush(stdin);
    scanf("%s", first_name);
    printf("Please enter your second name:\n");
    fflush(stdin);
    scanf("%s", second_name);
    printf("Please enter your date of birth in the form [DDMMYYYY]:\n");
    fflush(stdin);
    scanf("%s", date_of_birth);
    printf("Please enter the number of children staying:\n");
    fflush(stdin);
    scanf("%d", &num_children);
    printf("Please enter the number of adults between 18 and 65 staying:\n");
    fflush(stdin);
    scanf("%d", &num_adults);
    printf("Please enter the number of adults over 65 staying:\n");
    fflush(stdin);
    scanf("%d", &num_elderly);

    guestC.numChild = num_children;
    guestC.numAdult = num_adults;
    guestC.numOld = num_elderly;


    //checking if too many people
    if((num_children + num_adults + num_elderly) > 4)
    {
        printf("the maximum number of people is 4\n");
        menu();
        return;
    }

    //displays available rooms
    display_rooms();

    printf("which room would you like to stay in?\n");
    fflush(stdin);
    scanf("%d", &room);
    room -= 1;
    rooms[room] = 0;

    guestC.room = room;

    //adding data to global data structure
    for(int j = 0; j < strlen(first_name); j++)
    {
        names[room][0][j] = first_name[j];
    }
    for(int k = 0; k < strlen(second_name); k++)
    {
        names[room][1][k] = second_name[k];
    }
    for(int l = 0; l < 8; l++)
    {
        DOB[room][l] = date_of_birth[l] - 48;
    }
    numChild[room] = num_children;
    numAdult[room] = num_adults;
    numElderly[room] = num_elderly;

    //last pieces of relevant data
    printf("Please enter length of stay (in days):");
    fflush(stdin);
    scanf("%d", &length[room]);
    printf("Please chose which board type:\n1 - full board\n2 - half board\n3 - bed and breakfast\n");
    fflush(stdin);
    scanf("%d", &board_type[room]);
    printf("Would you like the daily newspaper?\n1 - yes\n2 - no\n");
    fflush(stdin);
    scanf("%d", &daily_newspaper);

    guestC.board = board_type[room];
    guestC.news = daily_newspaper;
    guestC.length = length[room];


    if(daily_newspaper == 1)
    {
        newspaper[room] = 1;
    }
    else
    {
        newspaper[room] = 0;
    }

    //generating randomized ID from second name and random number
    for(int m = 0; m < strlen(second_name); m++)
    {
        IDs[room][m] = second_name[m];
    }
    for(int n = 0; n < 4; n++)
    {
        srand(time(NULL)+n*30000);
        IDs[room][n+strlen(second_name)] = rand()%10+48;
    }
    printf("Your booking ID is %s\n\n", IDs[room]);

    strcpy(guestC.bookingID, IDs[room]);
    guestC.used = room;

    roomUsed[userPos]= room;
    menu();
}
//displaying available rooms function
void display_rooms() {
    printf("The available rooms are:\n");
    for (int i = 0; i < 4; i++) {
        if (rooms[i] == 1) {
            printf("room %d - £%d\n", i+1, room_rates[i]);
        }
    }
}



//book tables function
void book_tables()
{



    // ask for the booking id
    char bookingid[13];
    printf("Enter booking ID: ");
    fflush(stdin);
    scanf("%s", bookingid);



    int roomid = -1;
    // try and find a matching user with that booking id
    for(int t = 0; t < 4; t++){
        if (strcmp(IDs[t], bookingid )==0){
            roomid = t;
        }



    }
    if(roomid == -1){
        printf("Your booking id is not on our database\n");
        return menu();
    }
    int board = board_type[roomid];



    if (board == 3){
        printf("You can't book a table, due to you being in Bed and breakfast\n");
        return menu();
    }



    int table_availability = 0;
    for(int table = 0; table < 3; table++){
        for(int time = 0; time < 2; time++){
            if(tables[time][table] == 0){
                table_availability = 1;
            }
            //printf("%d" , tables[time][table]);
        }
    }
    if(table_availability == 1){
        printf("The following tables are available: \n");



    }
    else{
        printf("There are no tables available");
        return menu();
    }
    int option = 0;
    for(int table = 0; table < 3; table++){
        for(int time = 0; time < 2; time++){
            option++;
            if(tables[time][table] == 0){
                // printf("Tables available: \n");
                printf("%d . %s %s \n",option, table_names[table], table_time[time]);



            }
            //printf("%d" , tables[time][table]);
        }
    }
    int selection_table = 0;
    printf("What table would you like to book? \nEnter number:");
    fflush(stdin);
    scanf("%d", &selection_table);
    switch (selection_table){
        case 1:
            tables[0][0] = 1;
            printf("Your table has been booked\n");
            break;
        case 2:
            tables[1][0] = 1;
            printf("Your e has been booked\n");
            break;
        case 3:
            tables[0][1] = 1;
            printf("Your e has been booked\n");
            break;
        case 4:
            tables[1][1] = 1;
            printf("Your e has been booked\n");
            break;
        case 5:
            tables[0][2] = 1;
            printf("Your e has been booked\n");
            break;
        case 6:
            tables[1][2] = 1;
            printf("Your e has been booked\n");
            break;
        default:
            printf("You have entered an invalid number\n");
    }
    menu();
}
//check out function
void check_out()
{
    int validID = 0;
    float cost;
    while(validID != 1)
    {
        printf("enter ID:");
        fflush(stdin);
        // gets(currentID);
        scanf("%s", &currentID);
        for(int i = 0; i<4; i++)
        {
            if(strcmp(currentID, IDs[i]) == 0)
            {
                printf("valid ID\n");
                validID = 1;
                guestPos = i;
            }
        }
    }
    getCost(guestPos);
    displayCost();

    if(guestC.used ==1)
    {
        guest1 = guestE;
        guestC = guestE;
    }
    else if(guestC.used==2)
    {
        guest1 = guestE;
        guestC = guestE;
    }
    else if(guestC.used ==3)
    {
        guest1 = guestE;
        guestC = guestE;
    }
    else if(guestC.used==4)
    {
        guest1 = guestE;
        guestC = guestE;
    }
    menu();
}
void getCost(int n)
{
    roomCost =guestC.length*(guestC.numChild * room_rates[guestC.room] +
            guestC.numAdult * room_rates[guestC.room] +
            elderlyMultiply*guestC.numOld * room_rates[guestC.room]);
    boardCost = guestC.length*(childMultiply * guestC.numChild * board_rates[guestC.board-1] +
                guestC.numAdult * board_rates[guestC.board-1] +
                guestC.numOld * board_rates[guestC.board-1]);

    if(guestC.news == 1)
    {
        newsCost = 5.5;
    }
    totalCost = roomCost + boardCost + newsCost;
}
void displayCost()
{
    printf("Bill for %s\n", currentID);
    printf("Rooms: %f\n", roomCost);
    printf("Boards: %f\n", boardCost);
    if(newsCost == 5.5)
    {
        printf("Newspaper: %f\n", newsCost);
    }
    printf("Total: %f\n", totalCost);

    //:)
}