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package stanhebben.zenscript.expression.partial;

import java.util.Arrays;
import stanhebben.zenscript.compiler.IEnvironmentGlobal;
import stanhebben.zenscript.compiler.IEnvironmentMethod;
import stanhebben.zenscript.expression.Expression;
import stanhebben.zenscript.expression.ExpressionCallStatic;
import stanhebben.zenscript.expression.ExpressionInvalid;
import stanhebben.zenscript.symbols.IZenSymbol;
import stanhebben.zenscript.symbols.SymbolJavaStaticMethod;
import stanhebben.zenscript.type.ZenType;
import stanhebben.zenscript.type.natives.IJavaMethod;
import stanhebben.zenscript.util.ZenPosition;

/**
 *
 * @author Stanneke
 */
public class PartialStaticMethod implements IPartialExpression {
	private final ZenPosition position;
	private final IJavaMethod method;
	
	public PartialStaticMethod(ZenPosition position, IJavaMethod method) {
		this.position = position;
		this.method = method;
	}

	@Override
	public Expression eval(IEnvironmentGlobal environment) {
		environment.error(position, "not a valid expression");
		return new ExpressionInvalid(position);
	}

	@Override
	public Expression assign(ZenPosition position, IEnvironmentGlobal environment, Expression other) {
		environment.error(position, "cannot alter this final");
		return new ExpressionInvalid(position);
	}

	@Override
	public IPartialExpression getMember(ZenPosition position, IEnvironmentGlobal environment, String name) {
		environment.error(position, "methods have no members");
		return new ExpressionInvalid(position);
	}

	@Override
	public Expression call(ZenPosition position, IEnvironmentMethod environment, Expression... values) {
		if (method.accepts(environment, values)) {
			return new ExpressionCallStatic(position, environment, method, values);
		} else {
			environment.error(position, "parameter count mismatch: got " + values.length + " arguments");
			return new ExpressionInvalid(position, method.getReturnType());
		}
	}

	@Override
	public ZenType[] predictCallTypes(int numArguments) {
		return Arrays.copyOf(method.getParameterTypes(), numArguments);
	}

	@Override
	public IZenSymbol toSymbol() {
		return new SymbolJavaStaticMethod(method);
	}

	@Override
	public ZenType getType() {
		return method.getReturnType();
	}

	@Override
	public ZenType toType(IEnvironmentGlobal environment) {
		return ZenType.ANY;
	}
}