public string Execute()
{
var input = File.ReadAllLines("./Day4/Day4Input.txt");
bool done = false;
var yPosition = 0;
int goodPassports = 0;
var passport = new Passport();
while (!done)
{
if (yPosition >= input.Length)
{
break;
}
if (input[yPosition].Trim() is "")
{
if (passport.IsValid())
{
goodPassports++;
}
passport = new Passport();
}
else
{
var passportInformation = input[yPosition].Split(' ');
foreach (var passInfo in passportInformation)
{
var keyValueInfo = passInfo.Split(':');
int placeholderInt;
switch (keyValueInfo[0])
{
case "byr":
if (int.TryParse(keyValueInfo[1], out placeholderInt) && placeholderInt > 1919 && placeholderInt < 2003)
{
passport.Byr = keyValueInfo[1];
}
break;
case "iyr":
if (int.TryParse(keyValueInfo[1], out placeholderInt) && placeholderInt > 2009 && placeholderInt < 2021)
{
passport.Iyr = keyValueInfo[1];
}
else
{
Console.WriteLine($"invalid iyr:{keyValueInfo[1]}");
}
break;
case "eyr":
if (int.TryParse(keyValueInfo[1], out placeholderInt) && placeholderInt > 2019 && placeholderInt < 2031)
{
passport.Eyr = keyValueInfo[1];
}
break;
case "hgt":
if (keyValueInfo[1].Contains("cm"))
{
if (int.TryParse(keyValueInfo[1].Replace("cm", ""), out placeholderInt) && placeholderInt >= 150 && placeholderInt <= 193)
{
passport.Hgt = keyValueInfo[1];
}
}
if (keyValueInfo[1].Contains("in"))
{
if (int.TryParse(keyValueInfo[1].Replace("in", ""), out placeholderInt) && placeholderInt >= 59 && placeholderInt <= 76)
{
passport.Hgt = keyValueInfo[1];
}
}
break;
case "hcl":
Regex regex = new Regex("[#][0-9a-f]{6}");
if (regex.Matches(keyValueInfo[1]).Count > 0)
{
passport.Hcl = keyValueInfo[1];
}
break;
case "ecl":
if (keyValueInfo[1] == "amb" || keyValueInfo[1] == "blue" || keyValueInfo[1] == "brn" || keyValueInfo[1] == "gry" || keyValueInfo[1] == "grn" || keyValueInfo[1] == "hzl" || keyValueInfo[1] == "oth")
{
passport.Ecl = keyValueInfo[1];
}
break;
case "pid":
Regex regex2 = new Regex("[0-9]{9}");
if (regex2.Matches(keyValueInfo[1]).Count > 0)
{
passport.Hcl = keyValueInfo[1];
}
passport.Pid = keyValueInfo[1];
break;
case "cid":
passport.Cid = keyValueInfo[1];
break;
}
}
}
yPosition++;
}
return(goodPassports.ToString());
}
