/*
 * Copyright 2004-2011 H2 Group.
 * Copyright 2011 James Moger.
 *
 * 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.iciql;

import com.iciql.util.Utils;

/**
 * This class represents a query with an incomplete condition.
 *
 * @param <T> the return type of the query
 * @param <A> the incomplete condition data type
 */

public class QueryCondition<T, A> {

    private Query<T> query;
    private A x;

    QueryCondition(Query<T> query, A x) {
        this.query = query;
        this.x = x;
    }

    public <Q, Z> QueryWhere<T> in(SubQuery<Q, Z> q) {
        query.addConditionToken(new SubQueryCondition<A, Q, Z>(x, q));
        return new QueryWhere<T>(query);
    }

    public QueryWhere<T> oneOf(A... a) {
        return oneOf(Utils.newArrayIterable(a));
    }

    public QueryWhere<T> oneOf(Iterable<A> i) {
        query.addConditionToken(new Condition<A>(x, i, CompareType.IN));
        return new QueryWhere<T>(query);
    }

    public QueryWhere<T> noneOf(A... a) {
        return noneOf(Utils.newArrayIterable(a));
    }

    public QueryWhere<T> noneOf(Iterable<A> i) {
        query.addConditionToken(new Condition<A>(x, i, CompareType.NOT_IN));
        return new QueryWhere<T>(query);
    }

    public QueryWhere<T> is(A y) {
        if (y == null) {
            query.addConditionToken(new Condition<A>(x, CompareType.IS_NULL));
        } else {
            query.addConditionToken(new Condition<A>(x, y, CompareType.EQUAL));
        }
        return new QueryWhere<T>(query);
    }

    public QueryWhere<T> isNot(A y) {
        query.addConditionToken(new Condition<A>(x, y, CompareType.NOT_EQUAL));
        return new QueryWhere<T>(query);
    }

    public QueryWhere<T> isNull() {
        query.addConditionToken(new Condition<A>(x, CompareType.IS_NULL));
        return new QueryWhere<T>(query);
    }

    public QueryWhere<T> isNotNull() {
        query.addConditionToken(new Condition<A>(x, CompareType.IS_NOT_NULL));
        return new QueryWhere<T>(query);
    }

    public QueryWhere<T> exceeds(A y) {
        query.addConditionToken(new Condition<A>(x, y, CompareType.EXCEEDS));
        return new QueryWhere<T>(query);
    }

    public QueryWhere<T> atLeast(A y) {
        query.addConditionToken(new Condition<A>(x, y, CompareType.AT_LEAST));
        return new QueryWhere<T>(query);
    }

    public QueryWhere<T> lessThan(A y) {
        query.addConditionToken(new Condition<A>(x, y, CompareType.LESS_THAN));
        return new QueryWhere<T>(query);
    }

    public QueryWhere<T> atMost(A y) {
        query.addConditionToken(new Condition<A>(x, y, CompareType.AT_MOST));
        return new QueryWhere<T>(query);
    }

    public QueryBetween<T, A> between(A y) {
        return new QueryBetween<T, A>(query, x, y);
    }

    public QueryWhere<T> like(A pattern) {
        query.addConditionToken(new Condition<A>(x, pattern, CompareType.LIKE));
        return new QueryWhere<T>(query);
    }

    /*
     * These method allows you to generate "x=?", "x!=?", etc where conditions.
     * Parameter substitution must be done manually later with db.executeQuery.
     * This allows for building re-usable SQL string statements from your model
     * classes.
     */
    public QueryWhere<T> isParameter() {
        query.addConditionToken(new RuntimeParameter<A>(x, CompareType.EQUAL));
        return new QueryWhere<T>(query);
    }

    public QueryWhere<T> isNotParameter() {
        query.addConditionToken(new RuntimeParameter<A>(x, CompareType.NOT_EQUAL));
        return new QueryWhere<T>(query);
    }

    public QueryWhere<T> exceedsParameter() {
        query.addConditionToken(new RuntimeParameter<A>(x, CompareType.EXCEEDS));
        return new QueryWhere<T>(query);
    }

    public QueryWhere<T> lessThanParameter() {
        query.addConditionToken(new RuntimeParameter<A>(x, CompareType.LESS_THAN));
        return new QueryWhere<T>(query);
    }

    public QueryWhere<T> atMostParameter() {
        query.addConditionToken(new RuntimeParameter<A>(x, CompareType.AT_MOST));
        return new QueryWhere<T>(query);
    }

    public QueryWhere<T> likeParameter() {
        query.addConditionToken(new RuntimeParameter<A>(x, CompareType.LIKE));
        return new QueryWhere<T>(query);
    }
}