public static Reaction Parse(string line)
{
var inOutChunks = line
.Split("=>", 2, StringSplitOptions.RemoveEmptyEntries);
var(inputText, outuptText) = (inOutChunks[0], inOutChunks[1]);
return(new Reaction(ParseInputs(inputText), Chemical.Parse(outuptText)));
Chemical[] ParseInputs(string text)
{
return((
from chemical in text.Split(',')
select Chemical.Parse(chemical)
).ToArray());
}
}
public long Take(Chemical chemical)
{
long available = availableChemicals[chemical.Name];
if (available >= chemical.Quantity)
{
availableChemicals[chemical.Name] =
available - chemical.Quantity;
return(chemical.Name == "ORE" ? chemical.Quantity : 0);
}
else
{
if (chemical.Name == "ORE")
{
throw new OutOfOreException();
}
long missing = chemical.Quantity - availableChemicals[chemical.Name];
long oreCount = Produce(new Chemical(missing, chemical.Name));
availableChemicals[chemical.Name] -= chemical.Quantity;
return(oreCount);
}
long Produce(Chemical chemical)
{
var reaction = reactions[chemical.Name];
var reactionCount = reaction.Output.CountFor(chemical.Quantity);
var oreCount = (
from chem in reaction.Inputs
select Take(chem.Times(reactionCount))
).Sum();
var produced = reaction.Output.Quantity * reactionCount;
availableChemicals[chemical.Name] += produced;
return(oreCount);
}
}
private Reaction(Chemical[] inputs, Chemical output)
{
(Inputs, Output) = (inputs, output);
}
public long Take(string chemical)
{
return(Take(Chemical.Parse(chemical)));
}
public void Insert(Chemical chemical)
{
availableChemicals[chemical.Name] += chemical.Quantity;
}
public void Insert(string chemical)
{
Insert(Chemical.Parse(chemical));
}
