import React,{useEffect, useState} from "react";

function EmployeeValidationForm() {
const [user, setUser] = useState({name:"",email:"",employeeId:"",joiningDate:""});
const [error, setError] = useState({name:"",email:"",employeeId:"",joiningDate:""});
const [isFormValid, setIsFormValid] = useState(true);

useEffect(()=>{
if(validation()){
  setIsFormValid(false);
}
},[user]);

const validation =()=>{
  let isValid=true;
  let newError = {name:"",email:"",employeeId:"",joiningDate:""};

  if(!user.name.trim() || user.name.trim().length < 4){
    newError.name="Name must be at least 4 characters long and only contain letters and spaces";
    isValid=false;
  }
  const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
  if(!user.email.trim() || !emailRegex.test(user.email)){
    newError.email = "Email must be a valid email address";
    isValid=false;
  }
  const empIdRegex = /^\d{6}$/;
  if(!empIdRegex.test(user.employeeId)){
    newError.employeeId = "Employee ID must be exactly 6 digits"
    isValid=false;
  }
  if(!user.joiningDate.trim() || user.joiningDate > "2024-12-31"){
   newError.joiningDate = "Joining Date cannot be in the future"
   isValid=false;
  }
  setError(newError);
  return isValid;
}

const handleChange=(e)=>{
  e.preventDefault();
  const {name, value}=e.target;
setUser((prev)=>({
  ...prev,
  [name]:value
}));

};

const handleSubmit =()=>{
  if(validation()){
    setUser({name:"",email:"",employeeId:"",joiningDate:""});
    setError({name:"",email:"",employeeId:"",joiningDate:""});
    setIsFormValid(false);
  }else{
   console.log("Validation Failed.");
  }
};
  return (
    <div className="layout-column align-items-center mt-20 ">
      <div className="layout-column align-items-start mb-10 w-50" data-testid="input-name">
        <input
          className="w-100"
          type="text"
          name="name"
          value={user.name}
          placeholder="Name"
          data-testid="input-name-test"
          onChange={handleChange}
        />
        {error.name && 
        <p className="error mt-2">
          {error.name}
        </p>}
      </div>
      <div className="layout-column align-items-start mb-10 w-50" data-testid="input-email">
        <input
          className="w-100"
          type="text"
          name="email"
          value={user.email}
          placeholder="Email"
          onChange={handleChange}
        />
        {error.email &&
        <p className="error mt-2">{error.email}</p>
        }
      </div>
      <div className="layout-column align-items-start mb-10 w-50" data-testid="input-employee-id">
        <input
          className="w-100"
          type="text"
          name="employeeId"
          value={user.employeeId}
          placeholder="Employee ID"
          onChange={handleChange}
        />
        {error.employeeId &&
        <p className="error mt-2">{error.employeeId}</p>
        }
      </div>
      <div className="layout-column align-items-start mb-10 w-50" data-testid="input-joining-date">
        <input
          className="w-100"
          type="date"
          name="joiningDate"
          value={user.joiningDate}
          placeholder="Joining Date"
          onChange={handleChange}
        />
        {error.joiningDate &&
        <p className="error mt-2">{error.joiningDate}</p>
        }
      </div>
      <button data-testid="submit-btn" type="submit" onClick={handleSubmit} disabled={isFormValid}>
        Submit
      </button>
    </div>
  );
}

export default EmployeeValidationForm;