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/*
 * Copyright 2014 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.gradle.internal.rules;

import org.gradle.model.internal.type.ModelType;

public class DefaultRuleActionValidator implements RuleActionValidator {
    private static final String VALID_NO_TYPES = "Rule may not have an input parameter of type: %s.";
    private static final String VALID_SINGLE_TYPES = "Rule may not have an input parameter of type: %s. Second parameter must be of type: %s.";

    private final Class validInputType;

    public DefaultRuleActionValidator() {
        this.validInputType = null;
    }

    public DefaultRuleActionValidator(Class validInputType) {
        this.validInputType = validInputType;
    }

    @Override
    public  RuleAction validate(RuleAction ruleAction) {
        validateInputTypes(ruleAction);
        return ruleAction;
    }

    private void validateInputTypes(RuleAction ruleAction) {
        for (Class inputType : ruleAction.getInputTypes()) {
            if (validInputType == null) {
                throw new RuleActionValidationException(invalidParameterMessage(inputType));
            } else if (!validInputType.equals(inputType)) {
                throw new RuleActionValidationException(invalidParameterMessage(inputType));
            }
        }
    }

    private String invalidParameterMessage(Class inputType) {
        if (validInputType == null) {
            return String.format(VALID_NO_TYPES, inputType.getName());
        } else {
            return String.format(VALID_SINGLE_TYPES, inputType.getName(), className(validInputType));
        }
   }

    private static String className(Class aClass) {
        return ModelType.of(aClass).toString();
    }

}