/*
 * Copyright DataStax, Inc.
 *
 * 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.datastax.driver.core;

import org.assertj.core.api.AbstractAssert;

import java.util.Iterator;
import java.util.List;

import static com.datastax.driver.core.Assertions.assertThat;

public class TokenRangeAssert extends AbstractAssert<TokenRangeAssert, TokenRange> {
    protected TokenRangeAssert(TokenRange actual) {
        super(actual, TokenRangeAssert.class);
    }

    public TokenRangeAssert startsWith(Token token) {
        assertThat(actual.getStart()).isEqualTo(token);
        return this;
    }

    public TokenRangeAssert endsWith(Token token) {
        assertThat(actual.getEnd()).isEqualTo(token);
        return this;
    }

    public TokenRangeAssert isEmpty() {
        assertThat(actual.isEmpty()).isTrue();
        return this;
    }

    public TokenRangeAssert isNotEmpty() {
        assertThat(actual.isEmpty()).isFalse();
        return this;
    }

    public TokenRangeAssert isWrappedAround() {
        assertThat(actual.isWrappedAround()).isTrue();

        Token.Factory factory = actual.factory;

        List<TokenRange> unwrapped = actual.unwrap();
        assertThat(unwrapped.size())
                .as("%s should unwrap to two ranges, but unwrapped to %s", actual, unwrapped)
                .isEqualTo(2);

        Iterator<TokenRange> unwrappedIt = unwrapped.iterator();
        TokenRange firstRange = unwrappedIt.next();
        assertThat(firstRange).endsWith(factory.minToken());

        TokenRange secondRange = unwrappedIt.next();
        assertThat(secondRange).startsWith(factory.minToken());

        return this;
    }

    public TokenRangeAssert isNotWrappedAround() {
        assertThat(actual.isWrappedAround()).isFalse();
        assertThat(actual.unwrap()).containsExactly(actual);
        return this;
    }

    public TokenRangeAssert unwrapsTo(TokenRange... subRanges) {
        assertThat(actual.unwrap()).containsExactly(subRanges);
        return this;
    }

    public TokenRangeAssert intersects(TokenRange that) {
        assertThat(actual.intersects(that))
                .as("%s should intersect %s", actual, that)
                .isTrue();
        assertThat(that.intersects(actual))
                .as("%s should intersect %s", that, actual)
                .isTrue();
        return this;
    }

    public TokenRangeAssert doesNotIntersect(TokenRange... that) {
        for (TokenRange thatRange : that) {
            assertThat(actual.intersects(thatRange))
                    .as("%s should not intersect %s", actual, thatRange)
                    .isFalse();
            assertThat(thatRange.intersects(actual))
                    .as("%s should not intersect %s", thatRange, actual)
                    .isFalse();
        }
        return this;
    }

    public TokenRangeAssert contains(Token token, boolean isStart) {
        assertThat(actual.contains(token, isStart)).isTrue();
        return this;
    }

    public TokenRangeAssert doesNotContain(Token token, boolean isStart) {
        assertThat(actual.contains(token, isStart)).isFalse();
        return this;
    }
}
