//Function displayList is complete
//Function displayList returns a string (a list of) of all test scores
//stored in the parameter array named scores
function displayList(scores: number[]): string
{
    let s = ""
    for(let loc=0; loc<scores.length; loc++)
    {
        if(loc<scores.length-1)
            s = s+ scores[loc] +", "
        else
            s = s+ scores[loc]
    }
  return s;
}


// function hasImproved() takes as parameter an array of scores named scores.
// This function returns TRUE if all scores are improving, returns FALSE otherwise.
// scores are said to be improving if all scores in the list are greater than the
// previous score. For example [50, 80, 90, 100] is improving since any given score
// in the list is greater than the previous. On the otherhand, scores [90, 95, 85, 100] 
// are not improving because 85<95
function hasImproved(scores: number[]): boolean
{
    //DO NOT WRITE ANY CODE HERE
    for(let i=0; i<scores.length-1; i++)//5 6 8 9 4
    {
        for(let j=i+1; j<scores.length-2; j++)
        {
            if(scores[j]!<scores[i]!)
                return false
        }
    }
  return true
}

// function getAverage is complete.
// This function takes an array of test scores and two integers, start and end.
// getAverage returns the average of all scores starting at start and end 
// at to inclusive. For example. if scores is [80, 85, 75, 90, 100, 50] and 
// start=2 and end=4, getAverage will return the average of 75, 90 and 100
function getAverage(scores: number[], start:number, end: number): number
{
    //DO NOT WRITE ANY CODE HERE
    let sum=0;
    for(let i=start; i<=end; i++)
    {
        sum = sum + scores[i]!
    }
  return  sum/(end-start+1)
}

// ******************************** TASK 1 ***********************************
// Function computeGrade() takes as parameters an array of student test scores 
// named scores.
// This function needs to return the average of this student. The average
// needs to be computed according to the following rules:
// 1. If the student has improve, the average is computed from the scores on the 
//    second half of the list ONLY. If the list has odd number of scores, the extra score
//    is part of the second half. For example, if the student test scores list is
//    [50, 80, 85, 90, 95] the average should be calculated with scores [85, 90, 95]    use LabArrays for this, and use improve function for boolean :3
// 2. If the student has not improved, the average score is calculated including 
//    all the test scores
function computeGrade(scores: number[])
{
    if (hasImproved(scores)) {
        let temparray: number[] = scores.slice(Math.ceil(scores.length / 2), scores.length)
        return getAverage(temparray, 0, temparray.length-1)
        
    } else {
        return getAverage(scores, 0, scores.length-1);
    }
}

// ******************************** TASK 2 ***********************************
// Write the code to calculate the average of the following test scores and 
// display the data as shown in the sample run of the program shown in the 
// WORD DOCUMENT.
    // [95, 100, 80, 80, 100, 80, 60, 80, 90]
    // [95, 60, 80, 80, 50, 80, 60, 80, 90]
    // [95, 100, 75, 80, 80, 80, 60, 80, 75]
// You MUST use the other given functions when completing this TASK
let array: number[] = [85, 90, 96, 97, 98, 100]
let array2: number[] = [95, 60, 100, 80, 80, 85, 87, 90]
let array3: number[] = [95, 100, 75, 80, 80, 80, 60, 80, 75]

console.log(`Test Scores: ${displayList(array)}`)
console.log(`Average = ${computeGrade(array)}`)
console.log()
console.log(`Test Scores: ${displayList(array2)}`)
console.log(`Average = ${computeGrade(array2)}`)
console.log()
console.log(`Test Scores: ${displayList(array3)}`)
console.log(`Average = ${computeGrade(array3)}`)