//Retries maxRetries number of times, meaning that if you have 0, then it'll run the function once.
async function retryPromise<T>(
  promiseFn: () => Promise<T>, 
  maxRetries = 3, 
  delayOffset = 0, 
  delayRandomRange = 0
): Promise<T> {

  return new Promise<T>((resolve, reject) => {
    promiseFn()
      .then(resolve, (error: any) => { //On error
        if (maxRetries <= 0) {
          return reject(error);
        } else {
          if(delayRandomRange * Math.random() + delayOffset < 1.0){
            return retryPromise(promiseFn, maxRetries - 1, delayOffset, delayRandomRange).then(resolve, reject);
          }else{
            return new Promise<T>((resolveTwo, rejectTwo) => {
              setTimeout(() => {
                return retryPromise(promiseFn, maxRetries - 1, delayOffset, delayRandomRange).then(resolveTwo, rejectTwo);
              }, delayRandomRange * Math.random() + delayOffset);
            }).then(resolve, reject);
          }
        }
      });
  });
}

//Returns a function that will fail numTimes times, then will return aValue
function functionThatReturnsAFunctionThatFailsACoupleTimes(numTimes: number, aValue: any): () => Promise<any> {
  return async function(){
    if(numTimes == 0){
      return aValue;
    }
    numTimes--;
    throw false;
  };
}

const SMALL_NUMBER = 10;

function testTest(failNumberOfTimes: number){

  let functionThatFailsACoupleTimes = functionThatReturnsAFunctionThatFailsACoupleTimes(failNumberOfTimes, true);

  //Test my test
  for(let i = 0; i < (failNumberOfTimes * 2); ++i){
    function evalTest(val: any){
      let testTestFailedReason = "";
      if(val === undefined){
        testTestFailedReason = "Test test returned undefined for some reason.";
      }
      if((i + 1) > failNumberOfTimes){
        if(val === true){
          //We're good
        }else{
          testTestFailedReason = "Test test didn't return true when it should have.";
        }
      }else{
        if(val === false){
          //We're good
        }else{
          testTestFailedReason = "Test test didn't return false when it should have.";
        }
      }
      testTestFailedReason = testTestFailedReason || "Test test passed test case";
      console.log(testTestFailedReason, "at index", i, "where the function returned", val);
    }
    functionThatFailsACoupleTimes().then(evalTest, evalTest)
  };
}

testTest(SMALL_NUMBER);

let testCaseCounter = 1;

const throwsNoError = [
  (val: any) => {
    if(val == true){
      console.log("Passed test case " + testCaseCounter++);
    }else{
      console.error("Unexpected return value", val);
    }
  },
  () => {
    console.error("It wasn't supposed to fail!")
  }
]

const throwsError = [
  (val: any) => {
    console.error("It wasn't supposed to succeed!", val);
  },
  (val: any) => {
    if(val == false){
      console.log("Passed test case " + testCaseCounter++);
    }else{
      console.error("Unexpected return value", val);
    }
  }
];

//Runs SMALL_NUMBER times, because SMALL_NUMBER - 1 is the number of retries after the first one
let functionThatFailsACoupleTimes = functionThatReturnsAFunctionThatFailsACoupleTimes(SMALL_NUMBER - 1, true);

retryPromise(functionThatFailsACoupleTimes, SMALL_NUMBER - 1).then(...throwsNoError)

functionThatFailsACoupleTimes = functionThatReturnsAFunctionThatFailsACoupleTimes(SMALL_NUMBER - 1, true);

//Runs SMALL_NUMBER - 1 times, because SMALL_NUMBER - 2 is the number of retries after the first one
retryPromise(functionThatFailsACoupleTimes, SMALL_NUMBER - 2).then(...throwsError)

//Testing the delay. You'll have to wait a bit too.

functionThatFailsACoupleTimes = functionThatReturnsAFunctionThatFailsACoupleTimes(SMALL_NUMBER - 1, true);

//Runs SMALL_NUMBER times, because SMALL_NUMBER - 1 is the number of retries after the first one
retryPromise(functionThatFailsACoupleTimes, SMALL_NUMBER - 1, 500, 500).then(...throwsNoError)

functionThatFailsACoupleTimes = functionThatReturnsAFunctionThatFailsACoupleTimes(SMALL_NUMBER - 1, true);

//Runs SMALL_NUMBER - 1 times, because SMALL_NUMBER - 2 is the number of retries after the first one
retryPromise(functionThatFailsACoupleTimes, SMALL_NUMBER - 2, 500, 500).then(...throwsError)

// Print Hello, World!
console.log("Hello, World!");

function binarySearch(nums: number[], target: number): number {
    let left = 0;
    let right = nums.length - 1;

    while (left <= right) {
        const mid = left + Math.floor((right - left) / 2);

        if (nums[mid] === target) {
            return mid;
        } else if (nums[mid] < target) {
            left = mid + 1;
        } else {
            right = mid - 1;
        }
    }

    return left;
}

function searchInsert(nums: number[], target: number): number {
    return binarySearch(nums, target);
};

import { useState, useEffect, useRef } from "react";
// Usage
function App() {
  // State value and setter for our example
  const [count, setCount] = useState(0);
  // Get the previous value (was passed into hook on last render)
  const prevCount = usePrevious(count);
  // Display both current and previous count value
  return (
    <div>
      <h1>
        Now: {count}, before: {prevCount}
      </h1>
      <button onClick={() => setCount(count + 1)}>Increment</button>
    </div>
  );
}
// Hook
function usePrevious(value) {
  // The ref object is a generic container whose current property is mutable ...
  // ... and can hold any value, similar to an instance property on a class
  const ref = useRef();
  // Store current value in ref
  useEffect(() => {
    ref.current = value;
  }, [value]); // Only re-run if value changes
  // Return previous value (happens before update in useEffect above)
  return ref.current;
}

function removeElement(nums: number[], val: number): number {
    let zeroStartIndex = 0;
    for(let i = 0; i < nums.length; i++) {
        if(nums[i] !== val) {
            nums[zeroStartIndex] = nums[i];
            zeroStartIndex++;
        }
    }
    return zeroStartIndex;
};

const langToConfig = {
    'javascript': {
        image: '',
        cmd: ['']
    },
    'php': {
        image: '',
        cmd: ['']
    },
}