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package org.graalvm.polyglot.tck;

import org.graalvm.polyglot.PolyglotException;
import org.graalvm.polyglot.Value;

final class IdentityFunctionResultVerifier implements ResultVerifier {

    static final ResultVerifier INSTANCE = new IdentityFunctionResultVerifier();

    private IdentityFunctionResultVerifier() {
    }

    public void accept(SnippetRun snippetRun) throws PolyglotException {
        final PolyglotException exception = snippetRun.getException();
        if (exception != null) {
            throw exception;
        }

        Value parameter = snippetRun.getParameters().get(0);
        TypeDescriptor parameterType = TypeDescriptor.forValue(parameter);
        TypeDescriptor resultType = TypeDescriptor.forValue(snippetRun.getResult());
        if (!parameterType.isAssignable(resultType) || !resultType.isAssignable(resultType)) {
            throw new AssertionError(String.format(
                            "Identity function result type must contain the parameter type. Parameter type: %s Result type: %s.",
                            parameterType,
                            resultType));
        }
    }
}