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using System;
using System.Collections.Generic;
using System.Linq;
namespace aoc2019.lib
{
public class IntCodeVM
{
private long i;
private long relbase;
public long[] memory;
private readonly long[] program;
public Queue<long> input, output;
public IntCodeVM(string tape)
{
i = 0;
relbase = 0;
program = tape.Split(',').Select(long.Parse).ToArray();
memory = program;
input = new Queue<long>();
output = new Queue<long>();
}
public enum HaltType
{
Terminate,
Waiting
}
public void Reset()
{
i = 0;
relbase = 0;
memory = program;
input.Clear();
output.Clear();
}
public long Result => output.Dequeue();
public void AddInput(long value)
{
input.Enqueue(value);
}
private long MemGet(long addr)
{
return addr < memory.Length ? memory[addr] : 0;
}
private void MemSet(long addr, long value)
{
if (addr < 0) addr = 0;
if (addr >= memory.Length)
Array.Resize(ref memory, (int)addr + 1);
memory[addr] = value;
}
private long Mode(long idx)
{
var mode = MemGet(i) / 100;
for (var s = 1; s < idx; s++)
mode /= 10;
return mode % 10;
}
private long Get(long idx)
{
var param = MemGet(i + idx);
switch (Mode(idx))
{
case 0: return MemGet(param);
case 1: return param;
case 2: return MemGet(relbase + param);
default: throw new Exception("invalid parameter mode");
}
}
private void Set(long idx, long val)
{
var param = MemGet(i + idx);
switch (Mode(idx))
{
case 0: MemSet(param, val); break;
case 1: throw new Exception("cannot set in immediate mode");
case 2: MemSet(relbase + param, val); break;
default: throw new Exception("invalid parameter mode");
}
}
public HaltType Run(params long[] additionalInput)
{
foreach (var s in additionalInput) AddInput(s);
return Run();
}
public HaltType Run()
{
while (i < memory.Length)
{
var op = MemGet(i) % 100;
switch (op)
{
case 1:
Set(3, Get(1) + Get(2));
i += 4; break;
case 2:
Set(3, Get(1) * Get(2));
i += 4; break;
case 3:
if (!input.Any())
return HaltType.Waiting;
Set(1, input.Dequeue());
i += 2; break;
case 4:
output.Enqueue(Get(1));
i += 2; break;
case 5:
i = Get(1) == 0 ? i + 3 : Get(2);
break;
case 6:
i = Get(1) != 0 ? i + 3 : Get(2);
break;
case 7:
Set(3, Get(1) < Get(2) ? 1 : 0);
i += 4; break;
case 8:
Set(3, Get(1) == Get(2) ? 1 : 0);
i += 4; break;
case 9:
relbase += Get(1);
i += 2; break;
case 99:
return HaltType.Terminate;
default:
throw new Exception($"unknown op {op} at {i}");
}
}
return HaltType.Terminate;
}
}
}
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