/*
 *  ******************************************************************************
 *  *
 *  *
 *  * This program and the accompanying materials are made available under the
 *  * terms of the Apache License, Version 2.0 which is available at
 *  * https://www.apache.org/licenses/LICENSE-2.0.
 *  *
 *  *  See the NOTICE file distributed with this work for additional
 *  *  information regarding copyright ownership.
 *  * 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.
 *  *
 *  * SPDX-License-Identifier: Apache-2.0
 *  *****************************************************************************
 */

package org.datavec.api.transform.condition.column;

import lombok.Data;
import lombok.EqualsAndHashCode;
import org.datavec.api.transform.condition.ConditionOp;
import org.datavec.api.transform.condition.SequenceConditionMode;
import org.datavec.api.writable.Writable;
import com.fasterxml.jackson.annotation.JsonProperty;

import java.util.Set;

@EqualsAndHashCode(callSuper = true)
@Data
public class IntegerColumnCondition extends BaseColumnCondition {

    private final ConditionOp op;
    private final Integer value;
    private final Set<Integer> set;

    /**
     * Constructor for operations such as less than, equal to, greater than, etc.
     * Uses default sequence condition mode, {@link BaseColumnCondition#DEFAULT_SEQUENCE_CONDITION_MODE}
     *
     * @param columnName Column to check for the condition
     * @param op         Operation (<, >=, !=, etc)
     * @param value      Value to use in the condition
     */
    public IntegerColumnCondition(String columnName, ConditionOp op, int value) {
        this(columnName, DEFAULT_SEQUENCE_CONDITION_MODE, op, value);
    }

    /**
     * Constructor for operations such as less than, equal to, greater than, etc.
     *
     * @param column                Column to check for the condition
     * @param sequenceConditionMode Mode for handling sequence data
     * @param op                    Operation (<, >=, !=, etc)
     * @param value                 Value to use in the condition
     */
    public IntegerColumnCondition(String column, SequenceConditionMode sequenceConditionMode, ConditionOp op,
                    int value) {
        super(column, sequenceConditionMode);
        if (op == ConditionOp.InSet || op == ConditionOp.NotInSet) {
            throw new IllegalArgumentException(
                            "Invalid condition op: cannot use this constructor with InSet or NotInSet ops");
        }
        this.op = op;
        this.value = value;
        this.set = null;
    }

    /**
     * Constructor for operations: ConditionOp.InSet, ConditionOp.NotInSet
     * Uses default sequence condition mode, {@link BaseColumnCondition#DEFAULT_SEQUENCE_CONDITION_MODE}
     *
     * @param column Column to check for the condition
     * @param op     Operation. Must be either ConditionOp.InSet, ConditionOp.NotInSet
     * @param set    Set to use in the condition
     */
    public IntegerColumnCondition(String column, ConditionOp op, Set<Integer> set) {
        this(column, DEFAULT_SEQUENCE_CONDITION_MODE, op, set);
    }

    /**
     * Constructor for operations: ConditionOp.InSet, ConditionOp.NotInSet
     *
     * @param column                Column to check for the condition
     * @param sequenceConditionMode Mode for handling sequence data
     * @param op                    Operation. Must be either ConditionOp.InSet, ConditionOp.NotInSet
     * @param set                   Set to use in the condition
     */
    public IntegerColumnCondition(String column, SequenceConditionMode sequenceConditionMode, ConditionOp op,
                    Set<Integer> set) {
        super(column, sequenceConditionMode);
        if (op != ConditionOp.InSet && op != ConditionOp.NotInSet) {
            throw new IllegalArgumentException(
                            "Invalid condition op: can ONLY use this constructor with InSet or NotInSet ops");
        }
        this.op = op;
        this.value = null;
        this.set = set;
    }

    //Private constructor for Jackson deserialization only
    private IntegerColumnCondition(@JsonProperty("columnName") String columnName, @JsonProperty("op") ConditionOp op,
                    @JsonProperty("value") Integer value, @JsonProperty("set") Set<Integer> set) {
        super(columnName, DEFAULT_SEQUENCE_CONDITION_MODE);
        this.op = op;
        this.value = (set == null ? value : null);
        this.set = set;
    }


    @Override
    public boolean columnCondition(Writable writable) {
        switch (op) {
            case LessThan:
                return writable.toInt() < value;
            case LessOrEqual:
                return writable.toInt() <= value;
            case GreaterThan:
                return writable.toInt() > value;
            case GreaterOrEqual:
                return writable.toInt() >= value;
            case Equal:
                return writable.toInt() == value;
            case NotEqual:
                return writable.toInt() != value;
            case InSet:
                return set.contains(writable.toInt());
            case NotInSet:
                return !set.contains(writable.toInt());
            default:
                throw new RuntimeException("Unknown or not implemented op: " + op);
        }
    }

    @Override
    public String toString() {
        return "IntegerColumnCondition(columnName=\"" + columnName + "\"," + op + ","
                        + (op == ConditionOp.NotInSet || op == ConditionOp.InSet ? set : value) + ")";
    }

    /**
     * Condition on arbitrary input
     *
     * @param input the input to return
     *              the condition for
     * @return true if the condition is met
     * false otherwise
     */
    @Override
    public boolean condition(Object input) {
        Number n = (Number) input;
        switch (op) {
            case LessThan:
                return n.intValue() < value;
            case LessOrEqual:
                return n.intValue() <= value;
            case GreaterThan:
                return n.intValue() > value;
            case GreaterOrEqual:
                return n.intValue() >= value;
            case Equal:
                return n.intValue() == value;
            case NotEqual:
                return n.intValue() != value;
            case InSet:
                return set.contains(n.intValue());
            case NotInSet:
                return !set.contains(n.intValue());
            default:
                throw new RuntimeException("Unknown or not implemented op: " + op);
        }
    }
}
