/*
    * SPDX-License-Identifier: LGPL-2.1-or-later
    * See LICENSE file for details.
    *
    * Copyright 2012-2026 Hazendaz.
    */
   package com.github.hazendaz.maven.yuicompressor_maven_plugin;
   
   import java.lang.reflect.Field;
  
  import org.apache.maven.plugin.MojoExecutionException;
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests for the generated {@link HelpMojo}.
   * <p>
   * The HelpMojo is generated by maven-plugin-tools and loads its metadata from
   * {@code /META-INF/maven/com.github.hazendaz.maven/yuicompressor-maven-plugin/plugin-help.xml} which is present on the
   * test classpath via {@code target/classes}.
   */
  class HelpMojoTest {
  
      // ---------------------------------------------------------------- helpers
  
      /**
       * Creates a HelpMojo with its fields set via reflection.
       *
       * @param goal
       *            goal filter (may be null/empty to list all goals)
       * @param detail
       *            whether to show all parameters
       * @param lineLength
       *            display line length
       * @param indentSize
       *            indent size in spaces
       *
       * @return configured HelpMojo
       *
       * @throws Exception
       *             if reflection fails
       */
      private HelpMojo createMojo(String goal, boolean detail, int lineLength, int indentSize) throws Exception {
          final var mojo = new HelpMojo();
          setField(mojo, "goal", goal);
          setField(mojo, "detail", detail);
          setField(mojo, "lineLength", lineLength);
          setField(mojo, "indentSize", indentSize);
          return mojo;
      }
  
      /**
       * Sets a private field on an object via reflection.
       *
       * @param target
       *            the object to modify
       * @param fieldName
       *            the field name
       * @param value
       *            the value to set
       *
       * @throws Exception
       *             if reflection fails
       */
      private static void setField(Object target, String fieldName, Object value) throws Exception {
          Class<?> clazz = target.getClass();
          Field field = null;
          while (clazz != null) {
              try {
                  field = clazz.getDeclaredField(fieldName);
                  break;
              } catch (NoSuchFieldException e) {
                  clazz = clazz.getSuperclass();
              }
          }
          if (field == null) {
              throw new NoSuchFieldException(fieldName);
          }
          field.setAccessible(true);
          field.set(target, value);
      }
  
      // ------------------------------------------------------------------ tests
  
      /**
       * Execute with default parameters (no goal filter, no detail) should list all plugin goals without error.
       *
       * @throws Exception
       *             if execution fails
       */
      @Test
      void testExecute_defaultParams_listsAllGoals() throws Exception {
          final var mojo = createMojo(null, false, 80, 2);
          Assertions.assertDoesNotThrow(mojo::execute, "execute() with default params should not throw");
      }
  
      /**
       * Execute with goal="compress" should display help for that specific goal only.
       *
      * @throws Exception
      *             if execution fails
      */
     @Test
     void testExecute_withSpecificGoal_compress() throws Exception {
         final var mojo = createMojo("compress", false, 80, 2);
         Assertions.assertDoesNotThrow(mojo::execute, "execute() with goal='compress' should not throw");
     }
 
     /**
      * Execute with goal="jslint" should display help for that specific goal.
      *
      * @throws Exception
      *             if execution fails
      */
     @Test
     void testExecute_withSpecificGoal_jslint() throws Exception {
         final var mojo = createMojo("jslint", false, 80, 2);
         Assertions.assertDoesNotThrow(mojo::execute, "execute() with goal='jslint' should not throw");
     }
 
     /**
      * Execute with goal="help" should display help for the help goal.
      *
      * @throws Exception
      *             if execution fails
      */
     @Test
     void testExecute_withSpecificGoal_help() throws Exception {
         final var mojo = createMojo("help", false, 80, 2);
         Assertions.assertDoesNotThrow(mojo::execute, "execute() with goal='help' should not throw");
     }
 
     /**
      * Execute with detail=true and no goal filter should show all parameters for all goals.
      *
      * @throws Exception
      *             if execution fails
      */
     @Test
     void testExecute_detailTrue_allGoals() throws Exception {
         final var mojo = createMojo(null, true, 80, 2);
         Assertions.assertDoesNotThrow(mojo::execute, "execute() with detail=true should not throw");
     }
 
     /**
      * Execute with detail=true and a specific goal should show all parameters for that goal.
      *
      * @throws Exception
      *             if execution fails
      */
     @Test
     void testExecute_detailTrue_specificGoal() throws Exception {
         final var mojo = createMojo("compress", true, 80, 2);
         Assertions.assertDoesNotThrow(mojo::execute, "execute() with detail=true and goal='compress' should not throw");
     }
 
     /**
      * Execute with detail=true for jslint goal should show all parameters.
      *
      * @throws Exception
      *             if execution fails
      */
     @Test
     void testExecute_detailTrue_jslintGoal() throws Exception {
         final var mojo = createMojo("jslint", true, 80, 2);
         Assertions.assertDoesNotThrow(mojo::execute, "execute() with detail=true and goal='jslint' should not throw");
     }
 
     /**
      * Execute with lineLength &lt;= 0 should log a warning and use the default of 80.
      *
      * @throws Exception
      *             if execution fails
      */
     @Test
     void testExecute_invalidLineLength_usesDefault() throws Exception {
         final var mojo = createMojo(null, false, 0, 2);
         Assertions.assertDoesNotThrow(mojo::execute, "execute() with lineLength=0 should not throw");
     }
 
     /**
      * Execute with indentSize &lt;= 0 should log a warning and use the default of 2.
      *
      * @throws Exception
      *             if execution fails
      */
     @Test
     void testExecute_invalidIndentSize_usesDefault() throws Exception {
         final var mojo = createMojo(null, false, 80, 0);
         Assertions.assertDoesNotThrow(mojo::execute, "execute() with indentSize=0 should not throw");
     }
 
     /**
      * Execute with both lineLength and indentSize invalid.
      *
      * @throws Exception
      *             if execution fails
      */
     @Test
     void testExecute_bothInvalid_usesDefaults() throws Exception {
         final var mojo = createMojo(null, false, -1, -1);
         Assertions.assertDoesNotThrow(mojo::execute,
                 "execute() with both lineLength and indentSize invalid should not throw");
     }
 
     /**
      * Execute with a non-existent goal still completes but outputs nothing for that goal.
      *
      * @throws Exception
      *             if execution fails
      */
     @Test
     void testExecute_unknownGoal_noOutput() throws Exception {
         final var mojo = createMojo("nonexistent-goal", false, 80, 2);
         Assertions.assertDoesNotThrow(mojo::execute, "execute() with unknown goal should not throw");
     }
 
     /**
      * Execute with a very short lineLength to exercise line-wrapping.
      *
      * @throws Exception
      *             if execution fails
      */
     @Test
     void testExecute_shortLineLength_wrapsLines() throws Exception {
         final var mojo = createMojo(null, false, 40, 2);
         Assertions.assertDoesNotThrow(mojo::execute, "execute() with short lineLength should not throw");
     }
 
     /**
      * Execute with a large indentSize and detail enabled to exercise the parameter output.
      *
      * @throws Exception
      *             if execution fails
      */
     @Test
     void testExecute_largeIndentSize_detail() throws Exception {
         final var mojo = createMojo("compress", true, 120, 4);
         Assertions.assertDoesNotThrow(mojo::execute, "execute() with large indent and detail should not throw");
     }
 
     /**
      * Execute with an empty string goal (same as null – lists all goals).
      *
      * @throws Exception
      *             if execution fails
      */
     @Test
     void testExecute_emptyGoal_listsAllGoals() throws Exception {
         final var mojo = createMojo("", false, 80, 2);
         Assertions.assertDoesNotThrow(mojo::execute, "execute() with empty goal should not throw");
     }
 
     /**
      * Verify that execute succeeds when the plugin-help.xml resource is on the classpath.
      *
      * @throws MojoExecutionException
      *             if execution fails unexpectedly
      */
     @Test
     void testExecute_pluginHelpXmlPresent_doesNotThrow() throws MojoExecutionException {
         final var mojo = new HelpMojo();
         Assertions.assertDoesNotThrow(mojo::execute,
                 "Normal execute should succeed when plugin-help.xml is on classpath");
     }
 }