package slangc.model.expressions;

import slangc.api.BytecodeInstructionWriter;
import slangc.api.Reporter;
import slangc.bytecode.TypeSignature;
import slangc.model.ExpressionModel;
import slangc.model.ExpressionOwner;
import slangc.model.ExpressionResult;
import slangc.model.TypeLevel;
import slangc.model.TypeModel;
import slangc.model.UserTypeModel;
import slangc.parser.Branch;
import slangc.parser.Node;

public class OuterThisExpression extends ExpressionModel implements ExpressionOwner {
	private TypeModel leftHandSide;

	public OuterThisExpression(ExpressionOwner owner, Node source) {
		super(owner, source);
		Node t = ((Branch)source).getSubnode(0);
		leftHandSide = owner.resolveType(t);//ExpressionModel.construct(this, ((Branch)sourceFile).getSubnode(0));
	}

	@Override
	public void dump(Reporter reporter, String indent, String incr) {
		reporter.note("DUMP", indent + "> Outer this expression of " + leftHandSide);
		dumpResolved(reporter, indent + incr, incr);
	}

	@Override
	public TypeModel getExpectedResult(ExpressionModel e) {
		// TODO Auto-generated method stub
		return null;
	}
	
	public TypeModel getType() {
		return leftHandSide;
	}
	
	@Override
	public ExpressionModel[] getSubexpressions() {
		return NO_SUBEXPRESSIONS;
	}
	
	@Override
	protected ExpressionResult resolveResult() {
		// TODO Should probably check that the outer this actually makes sense first
		return new ExpressionResult.TypedValue(getType());
	}
	
	public static TypeSignature generatePossibleOuterThis(BytecodeInstructionWriter w, UserTypeModel thisThis, TypeModel desiredOuter) {
		return generatePossibleOuterThis(w, thisThis, desiredOuter, false);
	}
	
	private static TypeSignature generatePossibleOuterThis(BytecodeInstructionWriter w, UserTypeModel thisThis, TypeModel desiredOuter, boolean alreadyRecursing) {
		if ((thisThis == desiredOuter || thisThis.inherits(desiredOuter)) && !alreadyRecursing) {
			w.genThis();
			return thisThis.getTypeSignature();
		} else if (thisThis.isNonStaticInnerType()) {
			TypeModel outer = thisThis.getOwner().getNearestType();
			if (!alreadyRecursing) {
				w.genThis();
			}
			w.genOuterThis();
			if (outer == desiredOuter || outer.inherits(desiredOuter)) {
				return outer.getTypeSignature();
			} else {
				return generatePossibleOuterThis(w, (UserTypeModel) outer, desiredOuter, true);
			}
		} else {
			w.genError("Bad outer this, can't get to " + desiredOuter + " from " + thisThis);
			return null;
		}
	}
	
	@Override
	public TypeSignature innerGenerate(BytecodeInstructionWriter w) {
		return generatePossibleOuterThis(w, (UserTypeModel)getMethodOrField().getOwner(), leftHandSide);
	}

	public TypeModel resolveType(Node n) {
		return super.resolveType(n); // TODO: Better support for interfaces
	}
}