/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements. See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You 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
    *
    *      https://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 org.apache.commons.text.lookup;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertNull;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  import java.io.IOException;
  import java.nio.charset.StandardCharsets;
  import java.nio.file.Files;
  import java.nio.file.Path;
  import java.nio.file.Paths;
  
  import org.apache.commons.lang3.StringUtils;
  import org.apache.commons.text.StringSubstitutor;
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests {@link FileStringLookup}.
   */
  public class FileStringLookupTest {
  
      private static final Path DOCUEMENT_PATH = Paths.get("src/test/resources/org/apache/commons/text/document.properties");
      private static final Path CURRENT_PATH = Paths.get(StringUtils.EMPTY);
  
      public static String readDocumentFixtureString() throws IOException {
          return new String(Files.readAllBytes(DOCUEMENT_PATH), StandardCharsets.UTF_8);
      }
  
      public static void testFence(final String expectedString, final FileStringLookup fileStringLookup) {
          assertEquals(expectedString, fileStringLookup.apply("UTF-8:src/test/resources/org/apache/commons/text/document.properties"));
          assertThrows(IllegalArgumentException.class, () -> fileStringLookup.apply("UTF-8:/src/test/resources/org/apache/commons/text/document.properties"));
          assertThrows(IllegalArgumentException.class, () -> fileStringLookup.apply("UTF-8:../src/test/resources/org/apache/commons/text/document.properties"));
      }
  
      public static void testFence(final StringSubstitutor stringSubstitutor) throws IOException {
          assertEquals(readDocumentFixtureString(), stringSubstitutor.replace("${file:UTF-8:" + DOCUEMENT_PATH + "}"));
          assertThrows(IllegalArgumentException.class, () -> stringSubstitutor.replace("${file:UTF-8:/foo.txt}"));
          assertThrows(IllegalArgumentException.class, () -> stringSubstitutor.replace("${file:UTF-8:../foo.txt}"));
      }
  
      @Test
      void testDefaultInstanceBadCharsetName() {
          assertThrows(IllegalArgumentException.class,
                  () -> FileStringLookup.INSTANCE.apply("BAD_CHARSET_NAME:src/test/resources/org/apache/commons/text/document.properties"));
      }
  
      @Test
      void testDefaultInstanceBadDocumentPath() {
          assertThrows(IllegalArgumentException.class, () -> FileStringLookup.INSTANCE.apply("BAD_CHARSET_NAME:src/test/resources/DOCUMENT_NOT_FOUND.TXT"));
      }
  
      @Test
      void testDefaultInstanceMissingFilePart() {
          assertThrows(IllegalArgumentException.class, () -> FileStringLookup.INSTANCE.apply(StandardCharsets.UTF_8.name()));
      }
  
      @Test
      void testDefaultInstanceNull() {
          assertNull(FileStringLookup.INSTANCE.apply(null));
      }
  
      @Test
      void testDefaultInstanceOne() throws Exception {
          final String expectedString = readDocumentFixtureString();
          assertEquals(expectedString, FileStringLookup.INSTANCE.apply("UTF-8:src/test/resources/org/apache/commons/text/document.properties"));
      }
  
      @Test
      void testDefaultInstanceToString() {
          // does not blow up and gives some kind of string.
          assertFalse(FileStringLookup.INSTANCE.toString().isEmpty());
      }
  
      @Test
      void testFenceBadDirOne() throws Exception {
          final FileStringLookup fileStringLookup = new FileStringLookup(Paths.get("dir does not exist at all"));
          assertThrows(IllegalArgumentException.class, () -> fileStringLookup.apply("UTF-8:src/test/resources/org/apache/commons/text/document.properties"));
          assertThrows(IllegalArgumentException.class, () -> fileStringLookup.apply("UTF-8:/src/test/resources/org/apache/commons/text/document.properties"));
          assertThrows(IllegalArgumentException.class, () -> fileStringLookup.apply("UTF-8:../src/test/resources/org/apache/commons/text/document.properties"));
      }
  
     @Test
     void testFenceBadDirPlusGoodOne() throws Exception {
         final String expectedString = readDocumentFixtureString();
         final FileStringLookup fileStringLookup = new FileStringLookup(Paths.get("dir does not exist at all"), CURRENT_PATH);
         testFence(expectedString, fileStringLookup);
     }
 
     @Test
     void testFenceCurrentDirOne() throws Exception {
         final String expectedString = readDocumentFixtureString();
         final FileStringLookup fileStringLookup = new FileStringLookup(CURRENT_PATH);
         testFence(expectedString, fileStringLookup);
     }
 
     @Test
     void testFenceCurrentDirPlusOne() throws Exception {
         final String expectedString = readDocumentFixtureString();
         final FileStringLookup fileStringLookup = new FileStringLookup(Paths.get("target"), CURRENT_PATH);
         testFence(expectedString, fileStringLookup);
     }
 
     @Test
     void testFenceEmptyOne() throws Exception {
         final String expectedString = readDocumentFixtureString();
         assertEquals(expectedString, new FileStringLookup().apply("UTF-8:src/test/resources/org/apache/commons/text/document.properties"));
     }
 
     @Test
     void testFenceNullOne() throws Exception {
         final String expectedString = readDocumentFixtureString();
         assertEquals(expectedString,
                 new FileStringLookup((Path[]) null).apply("UTF-8:src/test/resources/org/apache/commons/text/document.properties"));
     }
 
     @Test
     void testInterpolatorReplace() throws IOException {
         final StringSubstitutor stringSubstitutor = StringSubstitutor.createInterpolator();
         assertEquals(readDocumentFixtureString(), stringSubstitutor.replace("${file:UTF-8:" + DOCUEMENT_PATH + "}"));
         final InterpolatorStringLookup stringLookup = (InterpolatorStringLookup) stringSubstitutor.getStringLookup();
         stringLookup.getStringLookupMap().replace(StringLookupFactory.KEY_FILE, StringLookupFactory.INSTANCE.fileStringLookup(CURRENT_PATH));
         testFence(stringSubstitutor);
     }
 }