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/*
 * Copyright (C) 2011 Thomas Akehurst
 *
 * 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.github.tomakehurst.wiremock.matching;

import com.fasterxml.jackson.annotation.JsonProperty;

import java.util.Objects;

import static org.apache.commons.lang3.StringUtils.getLevenshteinDistance;

public class EqualToPattern extends StringValuePattern {

    private final Boolean caseInsensitive;

    public EqualToPattern(
        @JsonProperty("equalTo") String testValue,
        @JsonProperty("caseInsensitive") Boolean caseInsensitive
    ) {
        super(testValue);
        this.caseInsensitive = caseInsensitive;
    }

    public EqualToPattern(String expectedValue) {
        this(expectedValue, null);
    }

    public String getEqualTo() {
        return expectedValue;
    }

    public Boolean getCaseInsensitive() {
        return caseInsensitive;
    }

    @Override
    public MatchResult match(final String value) {
        return new MatchResult() {
            @Override
            public boolean isExactMatch() {
                return
                        shouldMatchCaseInsensitive() ?
                                value != null && value.equalsIgnoreCase(expectedValue) :
                                Objects.equals(expectedValue, value);
            }

            @Override
            public double getDistance() {
                return normalisedLevenshteinDistance(expectedValue, value);
            }
        };
    }

    private boolean shouldMatchCaseInsensitive() {
        return caseInsensitive != null && caseInsensitive;
    }

    private double normalisedLevenshteinDistance(String one, String two) {
        if (one == null || two == null) {
            return 1.0;
        }

        double maxDistance = Math.max(one.length(), two.length());
        double actualDistance = getLevenshteinDistance(one, two);
        return (actualDistance / maxDistance);
    }

}