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/**
 * The MIT License (MIT)
 *
 * Copyright (c) 2011-2016 Incapture Technologies LLC
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package rapture.kernel.dp;

import java.util.LinkedList;
import java.util.List;
import java.util.Set;

import org.apache.http.HttpStatus;

import rapture.common.dp.ExpectedArgument;
import rapture.common.dp.Step;
import rapture.common.dp.Workflow;
import rapture.common.exception.RaptureExceptionFactory;

import com.google.common.collect.Sets;

/**
 * @author bardhi
 * @since 3/2/15.
 */
public class WorkflowValidator {
    public static void validate(Workflow workflow) {
        Set check = Sets.newHashSet();
        for (Step step : workflow.getSteps()) {
            if (!check.add(step)) {
                throw RaptureExceptionFactory.create(HttpStatus.SC_BAD_REQUEST, String.format("duplicateStep name '%s' not allowed", step.getName()));
            }
        }
        validateArgs(workflow.getExpectedArguments());
    }

    private static void validateArgs(List expectedArguments) {
        List badArgs = new LinkedList<>();
        for (ExpectedArgument arg : expectedArguments) {
            if (arg.getIsRequired() && arg.getDefaultValue() != null) {
                badArgs.add(arg.getName());
            }
        }
        if (badArgs.size() > 0) {
            throw RaptureExceptionFactory.create(HttpStatus.SC_BAD_REQUEST,
                    String.format("Expected arguments that the user is required to specify cannot have defaults. These are set incorrectly: %s", badArgs));
        }
    }
}