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/*
 * Copyright (c) 2018-present PowerFlows.org - all rights reserved.
 *
 * 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.powerflows.dmn.engine.configuration;


import lombok.Setter;
import lombok.experimental.Accessors;
import org.powerflows.dmn.engine.DecisionEngine;
import org.powerflows.dmn.engine.DefaultDecisionEngine;
import org.powerflows.dmn.engine.evaluator.decision.DecisionEvaluator;
import org.powerflows.dmn.engine.evaluator.entry.InputEntryEvaluator;
import org.powerflows.dmn.engine.evaluator.entry.OutputEntryEvaluator;
import org.powerflows.dmn.engine.evaluator.entry.mode.provider.EvaluationModeProviderFactory;
import org.powerflows.dmn.engine.evaluator.expression.provider.DefaultExpressionEvaluationProviderFactory;
import org.powerflows.dmn.engine.evaluator.expression.provider.ExpressionEvaluationConfiguration;
import org.powerflows.dmn.engine.evaluator.expression.provider.binding.MethodBinding;
import org.powerflows.dmn.engine.evaluator.rule.RuleEvaluator;
import org.powerflows.dmn.engine.evaluator.type.converter.TypeConverterFactory;

import java.util.Collections;
import java.util.List;

/**
 * Default DecisionEngine configurer.
 * Builds and configures {@link DefaultDecisionEngine} instances.
 * Allows for customisation of method binding configuration.
 *
 * @see MethodBinding
 */
@Accessors(chain = true, fluent = true)
public class DefaultDecisionEngineConfiguration implements DecisionEngineConfiguration {

    @Setter
    private List methodBindings = Collections.emptyList();
    private ExpressionEvaluationConfiguration configuration;
    private DecisionEvaluator decisionEvaluator;
    private RuleEvaluator ruleEvaluator;
    private EvaluationModeProviderFactory evaluationModeProviderFactory;
    private InputEntryEvaluator inputEntryEvaluator;
    private OutputEntryEvaluator outputEntryEvaluator;
    private DefaultExpressionEvaluationProviderFactory expressionEvaluationProviderFactory;
    private TypeConverterFactory typeConverterFactory;

    @Override
    public DecisionEngine configure() {
        initExpressionEvaluation();
        initEvaluationProviderFactory();
        initTypeConverterFactory();
        initEvaluationModeProviderFactory();
        initInputEntryEvaluator();
        initOutputEntryEvaluator();
        initRuleEvaluator();
        initDecisionEvaluator();

        return new DefaultDecisionEngine(decisionEvaluator);
    }

    private void initExpressionEvaluation() {
        configuration = ExpressionEvaluationConfiguration.builder()
                .methodBindings(methodBindings)
                .build();
    }

    private void initEvaluationProviderFactory() {
        expressionEvaluationProviderFactory = new DefaultExpressionEvaluationProviderFactory(configuration);
    }

    private void initTypeConverterFactory() {
        typeConverterFactory = new TypeConverterFactory();
    }

    private void initEvaluationModeProviderFactory() {
        evaluationModeProviderFactory = new EvaluationModeProviderFactory();
    }

    private void initInputEntryEvaluator() {
        inputEntryEvaluator = new InputEntryEvaluator(expressionEvaluationProviderFactory, typeConverterFactory, evaluationModeProviderFactory);
    }

    private void initOutputEntryEvaluator() {
        outputEntryEvaluator = new OutputEntryEvaluator(expressionEvaluationProviderFactory, typeConverterFactory);
    }

    private void initRuleEvaluator() {
        ruleEvaluator = new RuleEvaluator(inputEntryEvaluator, outputEntryEvaluator);
    }

    private void initDecisionEvaluator() {
        decisionEvaluator = new DecisionEvaluator(ruleEvaluator);
    }
}