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/*
 * Copyright 2014 - 2020 Blazebit.
 *
 * 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 com.blazebit.persistence.criteria.impl.expression;

import com.blazebit.persistence.criteria.impl.BlazeCriteriaBuilderImpl;
import com.blazebit.persistence.criteria.impl.ParameterVisitor;
import com.blazebit.persistence.criteria.impl.RenderContext;
import com.blazebit.persistence.parser.util.TypeConverter;
import com.blazebit.persistence.parser.util.TypeUtils;

import javax.persistence.criteria.Expression;
import javax.persistence.criteria.Subquery;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;

/**
 * @author Christian Beikov
 * @since 1.2.0
 */
public class InPredicate extends AbstractSimplePredicate implements BlazeCriteriaBuilderImpl.In {

    private static final long serialVersionUID = 1L;

    private final Expression expression;
    private final List> values;
    private boolean allLiterals = true;

    public InPredicate(BlazeCriteriaBuilderImpl criteriaBuilder, Expression expression) {
        this(criteriaBuilder, expression, new ArrayList>());
    }

    public InPredicate(BlazeCriteriaBuilderImpl criteriaBuilder, Expression expression, Expression... values) {
        this(criteriaBuilder, expression, Arrays.asList(values));
    }

    public InPredicate(BlazeCriteriaBuilderImpl criteriaBuilder, Expression expression, T... values) {
        this(criteriaBuilder, expression, new ArrayList(Arrays.asList(values)));
    }

    public InPredicate(BlazeCriteriaBuilderImpl criteriaBuilder, Expression expression, Collection values) {
        super(criteriaBuilder, false);
        this.expression = expression;
        this.values = new ArrayList>(values.size());
        final Class javaType = expression.getJavaType();

        if (javaType == null || !TypeUtils.isNumeric(javaType)) {
            for (T value : values) {
                this.values.add(new LiteralExpression(criteriaBuilder, value));
            }
        } else {
            TypeConverter converter = TypeUtils.getConverter((Class) javaType, criteriaBuilder.getEntityMetamodel().getEnumTypes().keySet());
            for (T value : values) {
                this.values.add(new LiteralExpression(criteriaBuilder, converter.convert(value)));
            }
        }
    }

    private InPredicate(BlazeCriteriaBuilderImpl criteriaBuilder, Expression expression, List> values) {
        super(criteriaBuilder, false);

        if (expression instanceof ParameterExpressionImpl) {
            throw new IllegalArgumentException("A parameter can't be the left hand expression of an in predicate!");
        }

        this.expression = expression;
        this.values = values;

        for (int i = 0; i < values.size(); i++) {
            Expression expr = values.get(i);
            if (expr == null) {
                throw new IllegalArgumentException("Null expression at index: " + (i + 1));
            }
            allLiterals = allLiterals && expr instanceof LiteralExpression;
        }
    }

    // Copy-constructor
    private InPredicate(BlazeCriteriaBuilderImpl criteriaBuilder, boolean negated, Expression expression, List> values, boolean allLiterals) {
        super(criteriaBuilder, negated);
        this.expression = expression;
        this.values = values;
        this.allLiterals = allLiterals;
    }

    @Override
    public AbstractPredicate copyNegated() {
        return new InPredicate(criteriaBuilder, !isNegated(), expression, values, allLiterals);
    }

    @Override
    @SuppressWarnings("unchecked")
    public Expression getExpression() {
        return (Expression) expression;
    }

    @Override
    public InPredicate value(T value) {
        return value(new LiteralExpression(criteriaBuilder, value));
    }

    @Override
    public InPredicate value(Expression value) {
        values.add(value);
        allLiterals = allLiterals && value instanceof LiteralExpression;
        return this;
    }

    @Override
    public void visitParameters(ParameterVisitor visitor) {
        visitor.visit(expression);

        for (Expression expr : values) {
            visitor.visit(expr);
        }
    }

    @Override
    @SuppressWarnings("unchecked")
    public void render(RenderContext context) {
        List> values = this.values;
        StringBuilder buffer = context.getBuffer();

        switch (values.size()) {
            case 0:
                if (isNegated()) {
                    buffer.append("1=1");
                } else {
                    buffer.append("1=0");
                }
                return;
            case 1:
                Expression first = values.get(0);
                if (first instanceof Subquery || (first instanceof ParameterExpressionImpl && Collection.class.isAssignableFrom(((ParameterExpressionImpl) first).getParameterType())) || allLiterals) {
                    context.apply(expression);

                    if (isNegated()) {
                        buffer.append(" NOT");
                    }

                    buffer.append(" IN ");
                    if (allLiterals) {
                        List