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

bool isValidYN(char letter)
{
    if(letter =='y'||letter == 'n')
        return true;
    else
        return false;
}

bool isValidNumber(char * string)
{
   for(int i = 0; i < strlen( string ); i ++)
   {
      if (string[i] < 48 || string[i] > 57)
         return false;
   }
    return true;
}

struct acc
{
    char name[100];
    float income, nGift, nDependant, tax, taxable, nPen, nIns, code, net;
};

void display_options();
void acc_create();
void acc_display();
void acc_search(float);
struct acc account[20];

int num_acc;

int main()
{
	float n;
    char option;
    num_acc=0;
    while(1)
    {
        display_options();
        printf("Enter your choice: ");
        option = getch();
        switch(option)
        {
          case '1':
                acc_create();
                break;
          case '2':
                acc_display();
                break;
          case '3':
                printf("\nEnter employee code to search: ");
                scanf("%f", &n);
                acc_search(n);
                break;
          default :
                system("cls");
                break;
        }
    }
}

void display_options()
{
    printf("\nChoose one of these following options: \n");
    printf("1. Enter a list of employee \n");
    printf("2. Display tax information \n");
    printf("3. Search an employee buy code \n");
    printf("0. Exit \n");
}

void acc_create()
{
    float nIncome, nGift, nDependant, nCode, nPen, nIns, tax, taxable, net;
    char name[50], income[50], pension, health, dependant[5], gift[50], code[5];
    fflush(stdin);
    printf("\nEnter personal information: \n");
    start1:
    printf("Enter your code: ");
    scanf("%s", code);
    if(atof(code)==0)
    	exit(main);
    if(!(isValidNumber(code)))
    {
        printf("Invalid input, re-enter: \n");
        goto start1;
    }
    nCode=atof(code);
    printf("Enter your name: ");
    fflush(stdin);
    gets(name);
    start2:
    printf("Income for the current month (in thounsand VND): ");
    scanf("%s", &income);
    if(!(isValidNumber(income)))
    {
        printf("Invalid input, re-enter: \n");
        goto start2;
    }
    nIncome=atof(income);
    start3:
    printf("Pension contributions (5%) y/n?: ");
    scanf("%s", &pension);
    if(!(isValidYN(pension)))
    {
        printf("Invalid input, re-enter: \n");
        goto start3;
    }
    if(pension=='y')
        nPen=nIncome*0.05;
    else
        nPen=0;
    start4:
    printf("Health Insurance (1%) y/n?: ");
    scanf("%s", &health);
    if(!(isValidYN(health)))
    {
        printf("Invalid input, re-enter: \n");
        goto start4;
    }
    if(health=='y')
        nIns=nIncome*0.01;
    else
        nIns=0;
    start5:
    printf("Number of dependants < 18 years old: ");
    scanf("%s", &dependant);
    nDependant=atof(dependant);
    if(!(isValidNumber(dependant)))
    {
        printf("Invalid input, re-enter: \n");
        goto start5;
    }
    start6:
    printf("Gift of charity: ");
    scanf("%s", &gift);
    nGift=atof(gift);
    if(!(isValidNumber(gift))||nGift>nIncome)
    {
        printf("Invalid input, re-enter: \n");
        goto start6;
    }
    float value=nIncome-(4000+nIncome*0.05+nIncome*0.01+nDependant*1600+nGift);
    if(value<=5000)
        tax=value*0.05;
    if(5000<value<=10000)
        tax=5000*0.05+(value-5000)*0.1;
    if(10000<value<=20000)
        tax=5000*0.05+5000*0.1+(value-10000)*0.15;
    if(20000<value<=30000)
        tax=5000*0.05+5000*0.1+10000*0.15+(value-20000)*0.2;
    if(30000<value<=50000)
        tax=5000*0.05+5000*0.1+10000*0.15+10000*0.2+(value-30000)*0.25;
    if(50000<value<=80000)
        tax=5000*0.05+5000*0.1+10000*0.15+10000*0.2+20000*0.25+(value-50000)*0.3;
    if(80000<value)
        tax=5000*0.05+5000*0.1+10000*0.15+10000*0.2+20000*0.25+30000*0.3+(value-80000)*0.35;
    strcpy(account[num_acc].name,name);
    account[num_acc].code=nCode;
    account[num_acc].income=nIncome;
    account[num_acc].nPen=nPen;
    account[num_acc].nIns=nIns;
    account[num_acc].nDependant=nDependant;
    account[num_acc].nGift=nGift;
    account[num_acc].taxable=nIncome-(4000+nIncome*0.05+nIncome*0.01+nDependant*1600+nGift);
    account[num_acc].tax=tax;
    account[num_acc].net=nIncome-tax;
    num_acc++;
}

void acc_display()
{
     register int num_acc = 0;
     while(strlen(account[num_acc].name)>0)
     {
         printf("\nCode                : %.0f \n" ,account[num_acc].code);
         printf("Name                : %s \n" ,account[num_acc].name);
         printf("Income:             : %.2f \n" ,account[num_acc].income);
         printf("Pens                : %.2f \n" ,account[num_acc].nPen);
         printf("Ins                 : %.2f \n" ,account[num_acc].nIns);
         printf("Depend              : %.2f \n" ,account[num_acc].nDependant*1600);
         printf("Charity             : %.2f \n\n" ,account[num_acc].nGift);
         printf("Taxable             : %.2f \n\n" ,account[num_acc].taxable);
         printf("Tax                 : %.2f \n\n" ,account[num_acc].tax);
         printf("Net                 : %.2f \n\n" ,account[num_acc].income-account[num_acc].tax);
         num_acc++;
     }
}
void acc_search(float n)
{
    for(int i=0;i<=10;i++)
    {
        if(account[i].code==n)
        {
            printf("\nCode                : %.0f \n" ,account[i].code);
            printf("Name                : %s \n" ,account[i].name);
            printf("Income:             : %.2f \n" ,account[i].income);
            printf("Pens                : %.2f \n" ,account[i].nPen);
            printf("Ins                 : %.2f \n" ,account[i].nIns);
            printf("Depend              : %.2f \n" ,account[i].nDependant*1600);
            printf("Charity             : %.2f \n\n" ,account[i].nGift);
            printf("Taxable             : %.2f \n\n" ,account[i].taxable);
            printf("Tax                 : %.2f \n\n" ,account[i].tax);
            printf("Net                 : %.2f \n\n" ,account[i].income-account[i].tax);
            break;
        }
    }
}