private PairOfPeople GetSmallestAgeDifference(List <Person> sortedPeople)
{
var smallestAgeDifferenceSoFar = new PairOfPeople()
{
FirstPerson = sortedPeople[0],
SecondPerson = sortedPeople[1],
AgeDifference = sortedPeople[1].BirthDate - sortedPeople[0].BirthDate
};
for (var i = 0; i < sortedPeople.Count - 1; i++)
{
var currentPerson = sortedPeople[i];
var nextPerson = sortedPeople[i + 1];
var currentAgeDifference = nextPerson.BirthDate - currentPerson.BirthDate;
if (currentAgeDifference < smallestAgeDifferenceSoFar.AgeDifference)
{
smallestAgeDifferenceSoFar = new PairOfPeople()
{
FirstPerson = currentPerson,
SecondPerson = nextPerson,
AgeDifference = currentAgeDifference
};
}
}
return(smallestAgeDifferenceSoFar);
}
private PairOfPeople GetLargestAgeDifference(List <Person> sortedPeople)
{
var indexOfPastPerson = sortedPeople.Count - 1;
var oldestPerson = sortedPeople[indexOfPastPerson];
var youngestPerson = sortedPeople[0];
var ageGap = oldestPerson.BirthDate - youngestPerson.BirthDate;
var largestAgeGapPair = new PairOfPeople()
{
FirstPerson = youngestPerson,
SecondPerson = oldestPerson,
AgeDifference = ageGap
};
return(largestAgeGapPair);
}
public PairOfPeople Find(AgeDifference ageDifference)
{
PairOfPeople output = new PairOfPeople();
if (_allPeople.Count > 1)
{
var sortedPeople = SortPeopleByBirthDate();
var possibleOutput = new PairOfPeople[2]
{
GetSmallestAgeDifference(sortedPeople),
GetLargestAgeDifference(sortedPeople)
};
output = possibleOutput[(int)ageDifference];
}
return(output);
}
private void AddAllPairs(List <PairOfPeople> listOfPairs)
{
for (var i = 0; i < people.Count - 1; i++)
{
for (var j = i + 1; j < people.Count; j++)
{
var pair = new PairOfPeople();
if (people[i].BirthDate < people[j].BirthDate)
{
pair.Younger = people[i];
pair.Older = people[j];
}
else
{
pair.Younger = people[j];
pair.Older = people[i];
}
pair.AgeDifference = pair.Older.BirthDate - pair.Younger.BirthDate;
listOfPairs.Add(pair);
}
}
}
public PairOfPeople Find(FinderFlag flag)
{
var listOfPairs = new List <PairOfPeople>();
AddAllPairs(listOfPairs);
PairOfPeople answer = new PairOfPeople();
if (listOfPairs.Count < 1)
{
return(answer);
}
listOfPairs = listOfPairs.OrderBy(p => p.AgeDifference).ToList();
var finderFlag = new Dictionary <FinderFlag, Action <IEnumerable <PairOfPeople> > >()
{
{ FinderFlag.Closest, (x) => x.First() }, { FinderFlag.Furthest, (x) => x.Last() }
};
return(() => finderFlag[flag]);
// switch (flag)
// {
// case FinderFlag.Closest:
// answer = listOfPairs.First();
// break;
// case FinderFlag.Furthest:
// answer = listOfPairs.Last();
// break;
// }
// return answer;
}