/*
 * Copyright 2016 The Closure Compiler Authors.
 *
 * 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.google.javascript.jscomp;

import static com.google.common.truth.Truth.assertThat;

import com.google.common.collect.ImmutableMap;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/**
 * Tests for ReplacedStringsDecoder.
 *
 */
@RunWith(JUnit4.class)
public class ReplacedStringsDecoderTest {

  private void verifyDecoder(String original, String replacement) {
    verifyDecoder(original, replacement, "");
  }

  private void verifyDecoder(String original, String replacement, String args) {
    String encoding = "Xy"; // an arbitrary encoding for the test
    VariableMap variableMap = VariableMap.fromMap(ImmutableMap.of(
        encoding, replacement
    ));
    ReplacedStringsDecoder decoder = new ReplacedStringsDecoder(variableMap);
    assertThat(decoder.decode(encoding + args)).isEqualTo(original);
  }

  @Test
  public void testSimpleDecoding() {
    verifyDecoder("A Message.", "A Message.");
  }

  @Test
  public void testDecodingWithArgs() {
    verifyDecoder("A foo B bar C.", "A ` B ` C.", "`foo`bar");
  }

  @Test
  public void testDecodingWithExcessSlots() {
    verifyDecoder("A foo B bar C - D -.", "A ` B ` C ` D `.", "`foo`bar");
  }

  @Test
  public void testDecodingWithExcessArgs() {
    verifyDecoder("A foo B bar C.baz-bam-", "A ` B ` C.", "`foo`bar`baz`bam");
  }

  @Test
  public void testTrailingArg() {
    verifyDecoder("foo bar", "foo `", "`bar");
  }

  @Test
  public void testEmptyArgs() {
    verifyDecoder("foo bar", "foo `bar``", "```");
  }

  @Test
  public void testNullDecoder() {
    ReplacedStringsDecoder nullDecoder = ReplacedStringsDecoder.NULL_DECODER;
    assertThat(nullDecoder.decode("foo")).isEqualTo("foo");
  }
}