package slangc.model.expressions;

import slangc.api.BytecodeInstructionWriter;
import slangc.api.Reporter;
import slangc.bytecode.TypeSignature;
import slangc.model.ClauseModel;
import slangc.model.ExpressionModel;
import slangc.model.ExpressionOwner;
import slangc.model.ExpressionResult;
import slangc.model.MethodModel;
import slangc.model.TypeModel;
import slangc.model.UserTypeModel;
import slangc.model.clauses.Arguments;
import slangc.parser.Branch;
import slangc.parser.ErrorType;
import slangc.parser.Node;

public class NormalMethodCallExpression extends ExpressionModel implements ExpressionOwner {
	private ExpressionModel leftHandSide;
	private String name;
	private Arguments arguments;

	public NormalMethodCallExpression(ExpressionOwner owner, Node source) {
		super(owner, source);
		leftHandSide = ExpressionModel.construct(this, ((Branch)source).getSubnode(0));
		name = UserTypeModel.plainName(((Branch)source).getSubnode(2));

		arguments = (Arguments)ClauseModel.construct(this, ((Branch)source).getSubnode(3));
		//sourceFile.annotate(ErrorType.INTERNAL_ERROR, "Unrecognised expression (Internal error/TODO)");
	}

	@Override
	public void dump(Reporter reporter, String indent, String incr) {
		reporter.note("DUMP", indent + "> Normal method call expression '" + name + "' of:");
		dumpResolved(reporter, indent + incr, incr);
		leftHandSide.dump(reporter, indent + incr, incr);
		arguments.dump(reporter, indent + incr, incr);
	}

	@Override
	public ExpressionModel[] getSubexpressions() {
		ExpressionModel[] args = arguments.getSubexpressions();
		ExpressionModel[] result = new ExpressionModel[args.length + 1];
		for (int i = 0; i < result.length; i++) {
			if (i == 0) {
				result[i] = leftHandSide;
			} else {
				result[i] = args[i - 1];
			}
		}
		return result;
	}
	
	public String getName() {
		return name;
	}

	@Override
	public TypeModel getExpectedResult(ExpressionModel e) {
		// TODO Auto-generated method stub
		return null;
	}
	
	public ExpressionModel getLeftHandSide() {
		return leftHandSide;
	}
	
	public Arguments getArguments() {
		return arguments;
	}
	
	@Override
	protected ExpressionResult resolveResult() {
		if (leftHandSide.getResult().resolvesToValueOrNull() && leftHandSide.getResult().getKind() != ExpressionResult.Kind.NULL) {
			TypeModel lhsType = leftHandSide.getResult().getValueType();
			targetMethod = bestTargetMethod(lhsType.getMethods(name, true), arguments);
			return ExpressionResult.fromMethodResult(targetMethod);
		} else if (leftHandSide.getResult().getKind() == ExpressionResult.Kind.POINTS_TO_TYPE) {
			TypeModel staticType = ((ExpressionResult.PointsToType) leftHandSide.getResult()).getType();
			targetMethod = bestTargetMethod(staticType.getMethods(name, true), arguments);
			return ExpressionResult.fromMethodResult(targetMethod);
		} else {
			leftHandSide.getSource().annotate(ErrorType.INTERNAL_ERROR, "Failed to resolve method target");
			return ExpressionResult.INVALID;
		}
	}
	
	private MethodModel targetMethod = null;
	
	@Override
	public boolean hasTargetMethod() {
		return true;
	}
	
	@Override
	public MethodModel getTargetMethod() {
		// TODO Auto-generated method stub
		return targetMethod;
	}
	
	@Override
	public TypeSignature innerGenerate(BytecodeInstructionWriter w) {
		arguments.generate(w, getTargetMethod(), true);
		if (!getTargetMethod().isStatic()) {
			// TODO: Handle outer-this calls
			getLeftHandSide().generate(w);
		}
		w.genCall(getTargetMethod().getMethodSignature());
		return getTargetMethod().getMethodSignature().returnType;
	}

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