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/*******************************************************************************
 * Copyright © 2013, 2016 Modelsolv, Inc.
 * All Rights Reserved.
 *
 * NOTICE: All information contained herein is, and remains the property
 * of ModelSolv, Inc. See the file license.html in the root directory of
 * this project for further information.
 *******************************************************************************/
package com.reprezen.genflow.api.template.builders;

import java.util.Optional;

import com.reprezen.genflow.api.GenerationException;
import com.reprezen.genflow.api.outputitem.IOutputItem;

public class OutputItemBuilder extends NamedBuilderBase {

	private String outputItemClassName;
	private String outputFile;
	private String condition;

	public OutputItemBuilder using(IOutputItem outputItem) throws GenerationException {
		@SuppressWarnings("unchecked")
		Class> validClass = (Class>) outputItem.getClass();
		return using(validClass);
	}

	public OutputItemBuilder using(Class> outputItemClass) throws GenerationException {
		return using(outputItemClass.getName());
	}

	public OutputItemBuilder using(String className) throws GenerationException {
		Optional> outputItemClass = BuilderUtil.getClass(className);
		if (outputItemClass.isPresent() && !IOutputItem.class.isAssignableFrom(outputItemClass.get())) {
			throw new GenerationException("Output Item class does not implement IOutputItem: " + className);
		}
		this.outputItemClassName = className;
		return this;
	}

	public OutputItemBuilder writing(String outputFile) {
		this.outputFile = outputFile;
		return this;
	}

	public OutputItemBuilder when(String condition) {
		this.condition = condition;
		return this;
	}

	public OutputItemSpec build() throws GenerationException {
		return new OutputItemSpec(name, outputItemClassName, outputFile, condition, descriptionLines);
	}

	public static class OutputItemSpec extends NamedSpecBase {
		private final String outputItemClassName;
		private final String outputFile;
		private final String condition;

		public OutputItemSpec(String name, String outputItemClassName, String outputFile, String condition,
				String[] descriptionLines) throws GenerationException {
			super(name, descriptionLines);
			this.outputItemClassName = outputItemClassName;
			this.outputFile = outputFile;
			this.condition = condition;
			validate();
		}

		public String getOutputItemClassName() {
			return outputItemClassName;
		}

		public Optional> getOutputItemInstance(ClassLoader classLoader) {
			return BuilderUtil.getInstance(outputItemClassName, classLoader);
		}

		public String getOutputFile() {
			return outputFile;
		}

		public String getCondition() {
			return condition;
		}

		@Override
		protected boolean isNameOptional() {
			return true;
		}

		@Override
		public void validate() throws GenerationException {
			super.validate();
			if (outputItemClassName == null) {
				throw new GenerationException("Output item is missing");
			}
			if (outputFile != null && outputFile.isEmpty()) {
				throw new GenerationException("Output file, if specified, must not be empty");
			}
			if (condition != null && condition.isEmpty()) {
				throw new GenerationException("Condition, if specified must not be empty");
			}
		}

		@Override
		public String toString() {
			String primaryType = "?";
			String itemType = "?";
			Optional