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.FieldModel;
import slangc.model.MethodModel;
import slangc.model.StatementOwner;
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 NewClassExpression extends ExpressionModel implements StatementOwner {
	TypeModel declaredType;
	Arguments arguments;

	public NewClassExpression(ExpressionOwner owner, Node source) {
		super(owner, source);
		//type = owner.resolveType(((Branch)source).getSubnode(1));
		
		declaredType = getOwner().getTypeScope().getInnerTypeForSource((Branch)source);
		if (declaredType == null) {
			source.annotate(ErrorType.INTERNAL_ERROR, "Unable to match expression to type declaration");
		}
		
		if (declaredType instanceof UserTypeModel) {
			((UserTypeModel)declaredType).statementOrExpression = this;
		}
		
		arguments = (Arguments)ClauseModel.construct(this, ((Branch)source).getSubnode(2));
	}

	public TypeModel getType() {
		return declaredType;
	}
	
	public Arguments getArguments() {
		return arguments;
	}
	
	@Override
	public void dump(Reporter reporter, String indent, String incr) {
		reporter.note("DUMP", indent + "> New class expression of '" + declaredType + "'");
		dumpResolved(reporter, indent + incr, incr);
		arguments.dump(reporter, indent + incr, incr);
	}


	@Override
	public ExpressionModel[] getSubexpressions() {
		// NOTE: Only the expressions in the arguments are considered subexpressions
		// (any expressions within the defined class are handled as portions of that type instead)
		return arguments.getSubexpressions();
	}
	
	@Override
	protected ExpressionResult resolveResult() {
		targetMethod = bestTargetMethod(declaredType.simplify().getInstanceConstructors(), arguments);
		return new ExpressionResult.TypedValue(declaredType.simplify());
	}

	private MethodModel targetMethod = null;
	
	@Override
	public boolean hasTargetMethod() {
		return true;
	}
	
	@Override
	public MethodModel getTargetMethod() {
		// TODO Auto-generated method stub
		return targetMethod;
	}
	
	public static TypeSignature[] generateUpvalueLoads(BytecodeInstructionWriter w, UserTypeModel type) {
		FieldModel[] upvalues = type.getUpvalues();
		TypeSignature[] result = new TypeSignature[upvalues.length];
		for (int i = 0; i < upvalues.length; i++) {
			w.genLoadLocalOrParam(upvalues[i].getStorageType().getTypeSignature(), upvalues[i].getUpvalueReference().getIndex());
			result[i] = upvalues[i].getStorageType().getTypeSignature();
		}
		return result;
	}
	
	@Override
	public TypeSignature innerGenerate(BytecodeInstructionWriter w) {
		UserTypeModel t = (UserTypeModel) getType().simplify();
		UserTypeModel outer = (UserTypeModel) t.getOwner().getNearestType();
		OuterThisExpression.generatePossibleOuterThis(w, (UserTypeModel)getMethodOrField().getOwner(), outer);
		TypeSignature[] upvs = generateUpvalueLoads(w, t);
		arguments.generate(w, getTargetMethod(), true);
		w.genNewInner(getTargetMethod().getMethodSignature(), upvs);
		return getType().simplify().getTypeSignature();
	}

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