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using System.Collections.Generic;
using System.Linq;
namespace aoc2019
{
internal sealed class Day5 : Day
{
private readonly IEnumerable<int> tape;
private int output;
public Day5()
{
tape = Input.First().Split(',').Select(int.Parse);
}
public override int DayNumber => 5;
public void RunIntCode(List<int> v, int input)
{
var i = 0;
while (i < v.Count && v[i] != 99)
{
int Val(int mode, int val)
{
return mode != 0 ? val : v[val];
}
var mode1 = v[i] / 100 % 10;
var mode2 = v[i] / 1000;
switch (v[i] % 100)
{
case 1:
v[v[i + 3]] = Val(mode1, v[i + 1]) + Val(mode2, v[i + 2]);
i += 4;
break;
case 2:
v[v[i + 3]] = Val(mode1, v[i + 1]) * Val(mode2, v[i + 2]);
i += 4;
break;
case 3:
v[v[i + 1]] = input;
i += 2;
break;
case 4:
output = Val(mode1, v[i + 1]);
i += 2;
break;
case 5:
i = Val(mode1, v[i + 1]) == 0 ? i + 3 : Val(mode2, v[i + 2]);
break;
case 6:
i = Val(mode1, v[i + 1]) != 0 ? i + 3 : Val(mode2, v[i + 2]);
break;
case 7:
v[v[i + 3]] = Val(mode1, v[i + 1]) < Val(mode2, v[i + 2]) ? 1 : 0;
i += 4;
break;
case 8:
v[v[i + 3]] = Val(mode1, v[i + 1]) == Val(mode2, v[i + 2]) ? 1 : 0;
i += 4;
break;
}
}
}
public override string Part1()
{
RunIntCode(tape.ToList(), 1);
return $"{output}";
}
public override string Part2()
{
RunIntCode(tape.ToList(), 5);
return $"{output}";
}
}
}
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