import React, { useState } from 'react';

export function TextAreaForJson({handleSubmit}){
  let [value, setValue] = useState(`[
    {
      "name": "Some element. The name field is necessary",
      "url": "http://www.example.com",
      "somethirdfield": "a"
    },
    {
      "name": "Another element",
      "url": "http://www.example1.com",
      "somethirdfield": "b"
    },
    {
      "name": "A third element",
      "url": "http://www.example2.com",
      "isReferenceValue": true,
      "somethirdfield": "c"
    }
  ]`)
  const [displayingDoneMessage, setDisplayingDoneMessage] = useState(false)
  const [displayingDoneMessageTimer, setDisplayingDoneMessageTimer] = useState(null)

  let handleChange = (event) => {
    setValue(event.target.value)
  }

  let handleSubmitInner = (event) => {
    clearTimeout(displayingDoneMessageTimer)
    event.preventDefault();
    //console.log(event)
    console.log("value@handleSubmitInner@TextAreaForJson")
    //console.log(typeof(value));
    console.log(value);
    try{
      let newData = JSON.parse(value)
      //console.log(typeof(newData))
      //console.log(newData)
      handleSubmit(newData)
      if(!newData.length || newData.length < 2){
        throw Error("Not enough objects")
      }
      setDisplayingDoneMessage(true)
      let timer = setTimeout(() => setDisplayingDoneMessage(false), 3000);
      setDisplayingDoneMessageTimer(timer)
    }catch(error){
      setDisplayingDoneMessage(false)
      //alert(error)
      //console.log(error)
      let substituteText = `Error: ${error.message}

Try something like:
[
  {
    "name": "Some element. The name field is necessary",
    "url": "http://www.example.com",
    "somethirdfield": "a"
  },
  {
    "name": "Another element",
    "url": "http://www.example1.com",
    "somethirdfield": "b"
  },
  {
    "name": "Another element",
    "url": "http://www.example2.com",
    "isReferenceValue": true,
    "somethirdfield": "c"
  }
]

Your old input was: ${value}`
      setValue(substituteText)
    }
    
    
  }
  return (
    <form onSubmit={handleSubmitInner} className="inline">
      <br/>
      <br/>
      <textarea 
        value={value} 
        onChange={handleChange} 
        rows="10" cols="50"
        className=""
      />
      <br/>
      <button 
        className="bg-transparent hover:bg-blue-500 text-blue-700 font-semibold hover:text-white py-2 px-4 border border-blue-500 hover:border-transparent rounded mt-5 p-10"
        onClick={handleSubmitInner}>
        Change dataset
      </button>
      &nbsp;
      <button
        className={`${!displayingDoneMessage ? "hidden" : ""} bg-transparent text-blue-700 font-semibold py-2 px-4 border border-blue-500 rounded mt-5 p-10`}
      >
        Done!
      </button>
    </form>
  );
}