import React from "react"
import Die from "./Die"
import {nanoid} from "nanoid"

export default function App() {

    const [dice, setDice] = React.useState(allNewDice())
    
/**
 * Challenge:
 * 1. Add new state called `tenzies`, default to false. It
 *    represents whether the user has won the game yet or not.
 * 2. Add an effect that runs every time the `dice` state array 
 *    changes. For now, just console.log("Dice state changed").
 */

    function generateNewDie() {
        return {
            value: Math.ceil(Math.random() * 6),
            isHeld: false,
            id: nanoid()
        }
    }
    
    function allNewDice() {
        const newDice = []
        for (let i = 0; i < 10; i++) {
            newDice.push(generateNewDie())
        }
        return newDice
    }
    
    
    function rollDice() {
        setDice(oldDice => oldDice.map(die => {
            return die.isHeld ? 
                die :
                generateNewDie()
        }))
    }
    
    function holdDice(id) {
        setDice(oldDice => oldDice.map(die => {
            return die.id === id ? 
                {...die, isHeld: !die.isHeld} :
                die
        }))
    }
    
    const diceElements = dice.map(die => (
        <Die 
            key={die.id} 
            value={die.value} 
            isHeld={die.isHeld} 
            holdDice={() => holdDice(die.id)}
        />
    ))
    
    return (
        <main>
            <h1 className="title">Tenzies</h1>
            <p className="instructions">Roll until all dice are the same. Click each die to freeze it at its current value between rolls.</p>
            <div className="dice-container">
                {diceElements}
            </div>
            <button className="roll-dice" onClick={rollDice}>Roll</button>
        </main>
    )
}