/*
    * 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
    *
   *   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 org.apache.maven.plugins.invoker;
  
  import java.io.File;
  import java.util.Arrays;
  import java.util.Collection;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Objects;
  import java.util.Optional;
  import java.util.Properties;
  import java.util.function.Consumer;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  import org.apache.maven.shared.invoker.InvocationRequest;
  
  /**
   * Provides a convenient facade around the <code>invoker.properties</code>.
   *
   * @author Benjamin Bentmann
   */
  class InvokerProperties {
      private static final String SELECTOR_PREFIX = "selector.";
  
      private static final Pattern ENVIRONMENT_VARIABLES_PATTERN =
              Pattern.compile("invoker\\.environmentVariables\\.([A-Za-z][^.]+)(\\.(\\d+))?");
  
      // default values from Mojo configuration
      private Boolean defaultDebug;
      private Boolean defaultQuiet;
      private List<String> defaultGoals;
      private List<String> defaultProfiles;
      private String defaultMavenOpts;
      private Integer defaultTimeoutInSeconds;
      private Map<String, String> defaultEnvironmentVariables;
      private File defaultMavenExecutable;
      private Boolean defaultUpdateSnapshots;
  
      private enum InvocationProperty {
          PROJECT("invoker.project"),
          BUILD_RESULT("invoker.buildResult"),
          GOALS("invoker.goals"),
          PROFILES("invoker.profiles"),
          MAVEN_EXECUTABLE("invoker.mavenExecutable"),
          MAVEN_OPTS("invoker.mavenOpts"),
          FAILURE_BEHAVIOR("invoker.failureBehavior"),
          NON_RECURSIVE("invoker.nonRecursive"),
          OFFLINE("invoker.offline"),
          SYSTEM_PROPERTIES_FILE("invoker.systemPropertiesFile"),
          DEBUG("invoker.debug"),
          QUIET("invoker.quiet"),
          SETTINGS_FILE("invoker.settingsFile"),
          TIMEOUT_IN_SECONDS("invoker.timeoutInSeconds"),
          UPDATE_SNAPSHOTS("invoker.updateSnapshots");
  
          private final String key;
  
          InvocationProperty(final String s) {
              this.key = s;
          }
  
          @Override
          public String toString() {
              return key;
          }
      }
  
      private enum SelectorProperty {
          JAVA_VERSION(".java.version"),
          MAVEN_VERSION(".maven.version"),
          OS_FAMILY(".os.family");
  
          private final String suffix;
  
          SelectorProperty(String suffix) {
              this.suffix = suffix;
          }
  
          @Override
          public String toString() {
             return suffix;
         }
     }
 
     /**
      * The invoker properties being wrapped.
      */
     private final Properties properties;
 
     /**
      * Creates a new facade for the specified invoker properties. The properties will not be copied, so any changes to
      * them will be reflected by the facade.
      *
      * @param properties The invoker properties to wrap, may be <code>null</code> if none.
      */
     InvokerProperties(Properties properties) {
         this.properties = (properties != null) ? properties : new Properties();
     }
 
     /**
      * Default value for debug
      * @param defaultDebug a default value
      */
     public void setDefaultDebug(boolean defaultDebug) {
         this.defaultDebug = defaultDebug;
     }
 
     /**
      * Default value for quiet
      * @param defaultQuiet a default value
      */
     public void setDefaultQuiet(boolean defaultQuiet) {
         this.defaultQuiet = defaultQuiet;
     }
 
     /**
      * Default value for goals
      * @param defaultGoals a default value
      */
     public void setDefaultGoals(List<String> defaultGoals) {
         this.defaultGoals = defaultGoals;
     }
 
     /**
      * Default value for profiles
      * @param defaultProfiles a default value
      */
     public void setDefaultProfiles(List<String> defaultProfiles) {
         this.defaultProfiles = defaultProfiles;
     }
 
     /**
      * Default value for mavenExecutable
      * @param defaultMavenExecutable a default value
      */
     public void setDefaultMavenExecutable(String defaultMavenExecutable) {
         if (Objects.nonNull(defaultMavenExecutable) && !defaultMavenExecutable.isEmpty()) {
             this.defaultMavenExecutable = new File(defaultMavenExecutable);
         }
     }
 
     /**
      * Default value for mavenOpts
      * @param defaultMavenOpts a default value
      */
     public void setDefaultMavenOpts(String defaultMavenOpts) {
         this.defaultMavenOpts = defaultMavenOpts;
     }
 
     /**
      * Default value for timeoutInSeconds
      * @param defaultTimeoutInSeconds a default value
      */
     public void setDefaultTimeoutInSeconds(int defaultTimeoutInSeconds) {
         this.defaultTimeoutInSeconds = defaultTimeoutInSeconds;
     }
 
     /**
      * Default value for environmentVariables
      * @param defaultEnvironmentVariables a default value
      */
     public void setDefaultEnvironmentVariables(Map<String, String> defaultEnvironmentVariables) {
         this.defaultEnvironmentVariables = defaultEnvironmentVariables;
     }
 
     /**
      * Default value for updateSnapshots
      * @param defaultUpdateSnapshots a default value
      */
     public void setDefaultUpdateSnapshots(boolean defaultUpdateSnapshots) {
         this.defaultUpdateSnapshots = defaultUpdateSnapshots;
     }
 
     /**
      * Gets the invoker properties being wrapped.
      *
      * @return The invoker properties being wrapped, never <code>null</code>.
      */
     public Properties getProperties() {
         return this.properties;
     }
 
     /**
      * Gets the name of the corresponding build job.
      *
      * @return The name of the build job or an empty string if not set.
      */
     public String getJobName() {
         return this.properties.getProperty("invoker.name", "");
     }
 
     /**
      * Gets the description of the corresponding build job.
      *
      * @return The description of the build job or an empty string if not set.
      */
     public String getJobDescription() {
         return this.properties.getProperty("invoker.description", "");
     }
 
     /**
      * Get the corresponding ordinal value
      *
      * @return The ordinal value
      */
     public int getOrdinal() {
         return Integer.parseInt(this.properties.getProperty("invoker.ordinal", "0"));
     }
 
     /**
      * Gets the specification of JRE versions on which this build job should be run.
      *
      * @return The specification of JRE versions or an empty string if not set.
      */
     public String getJreVersion() {
         return this.properties.getProperty("invoker.java.version", "");
     }
 
     /**
      * Gets the specification of JRE versions on which this build job should be run.
      *
      * @return The specification of JRE versions or an empty string if not set.
      */
     public String getJreVersion(int index) {
         return this.properties.getProperty(SELECTOR_PREFIX + index + SelectorProperty.JAVA_VERSION, getJreVersion());
     }
 
     /**
      * Gets the specification of Maven versions on which this build job should be run.
      *
      * @return The specification of Maven versions on which this build job should be run.
      * @since 1.5
      */
     public String getMavenVersion() {
         return this.properties.getProperty("invoker.maven.version", "");
     }
 
     /**
      * @param index the selector index
      * @return The specification of Maven versions on which this build job should be run.
      * @since 3.0.0
      */
     public String getMavenVersion(int index) {
         return this.properties.getProperty(SELECTOR_PREFIX + index + SelectorProperty.MAVEN_VERSION, getMavenVersion());
     }
 
     /**
      * Gets the specification of OS families on which this build job should be run.
      *
      * @return The specification of OS families or an empty string if not set.
      */
     public String getOsFamily() {
         return this.properties.getProperty("invoker.os.family", "");
     }
 
     /**
      * Gets the specification of OS families on which this build job should be run.
      *
      * @param index the selector index
      * @return The specification of OS families or an empty string if not set.
      * @since 3.0.0
      */
     public String getOsFamily(int index) {
         return this.properties.getProperty(SELECTOR_PREFIX + index + SelectorProperty.OS_FAMILY, getOsFamily());
     }
 
     public Collection<InvokerToolchain> getToolchains() {
         return getToolchains(Pattern.compile("invoker\\.toolchain\\.([^.]+)\\.(.+)"));
     }
 
     public Collection<InvokerToolchain> getToolchains(int index) {
         return getToolchains(Pattern.compile("selector\\." + index + "\\.invoker\\.toolchain\\.([^.]+)\\.(.+)"));
     }
 
     private Collection<InvokerToolchain> getToolchains(Pattern p) {
         Map<String, InvokerToolchain> toolchains = new HashMap<>();
         for (Map.Entry<Object, Object> entry : this.properties.entrySet()) {
             Matcher m = p.matcher(entry.getKey().toString());
             if (m.matches()) {
                 String type = m.group(1);
                 String providesKey = m.group(2);
                 String providesValue = entry.getValue().toString();
 
                 InvokerToolchain tc = toolchains.get(type);
                 if (tc == null) {
                     tc = new InvokerToolchain(type);
                     toolchains.put(type, tc);
                 }
                 tc.addProvides(providesKey, providesValue);
             }
         }
         return toolchains.values();
     }
 
     /**
      * Extract environment variable from properties for given index.
      * Every environment variable without index is also returned.
      *
      * @param index index to lookup
      * @return map of environment name and value
      */
     private Map<String, String> getEnvironmentVariables(int index) {
 
         Map<String, String> envItems = new HashMap<>();
 
         for (Map.Entry<Object, Object> entry : properties.entrySet()) {
             Matcher matcher =
                     ENVIRONMENT_VARIABLES_PATTERN.matcher(entry.getKey().toString());
             if (matcher.matches()) {
 
                 if (String.valueOf(index).equals(matcher.group(3))) {
                     // variables with index has higher priority, so override
                     envItems.put(matcher.group(1), entry.getValue().toString());
                 } else if (matcher.group(3) == null) {
                     // variables without index has lower priority, so check if exist
                     if (!envItems.containsKey(matcher.group(1))) {
                         envItems.put(matcher.group(1), entry.getValue().toString());
                     }
                 }
             }
         }
         return envItems;
     }
 
     /**
      * Determines whether these invoker properties contain a build definition for the specified invocation index.
      *
      * @param index The one-based index of the invocation to check for, must not be negative.
      * @return <code>true</code> if the invocation with the specified index is defined, <code>false</code> otherwise.
      */
     public boolean isInvocationDefined(int index) {
         return Arrays.stream(InvocationProperty.values())
                 .map(InvocationProperty::toString)
                 .map(v -> properties.getProperty(v + '.' + index))
                 .anyMatch(Objects::nonNull);
     }
 
     /**
      * Determines whether these invoker properties contain a build definition for the specified selector index.
      *
      * @param index the index
      * @return <code>true</code> if the selector with the specified index is defined, <code>false</code> otherwise.
      * @since 3.0.0
      */
     public boolean isSelectorDefined(int index) {
         return Arrays.stream(SelectorProperty.values())
                 .map(v -> v.suffix)
                 .map(v -> properties.getProperty(SELECTOR_PREFIX + index + v))
                 .anyMatch(Objects::nonNull);
     }
 
     private <T> void setIfNotNull(Consumer<T> consumer, T value) {
         if (value != null) {
             consumer.accept(value);
         }
     }
 
     /**
      * Configures the specified invocation request from these invoker properties. Settings not present in the invoker
      * properties will be left unchanged in the invocation request.
      *
      * @param request The invocation request to configure, must not be <code>null</code>.
      * @param index The one-based index of the invocation to configure, must not be negative.
      */
     public void configureInvocation(InvocationRequest request, int index) {
         get(InvocationProperty.PROJECT, index).ifPresent(project -> {
             File file = new File(request.getBaseDirectory(), project);
             if (file.isFile()) {
                 request.setBaseDirectory(file.getParentFile());
                 request.setPomFile(file);
             } else {
                 request.setBaseDirectory(file);
                 request.setPomFile(null);
             }
         });
 
         setIfNotNull(
                 request::setGoals,
                 get(InvocationProperty.GOALS, index)
                         .map(s -> s.trim().split("\\s*[ ,]+\\s*"))
                         .map(Arrays::asList)
                         .filter(l -> !l.isEmpty())
                         .orElse(defaultGoals));
 
         setIfNotNull(
                 request::setProfiles,
                 get(InvocationProperty.PROFILES, index)
                         .map(s -> s.trim().split("\\s*[ ,]+\\s*"))
                         .map(Arrays::asList)
                         .filter(l -> !l.isEmpty())
                         .orElse(defaultProfiles));
 
         setIfNotNull(
                 request::setMavenExecutable,
                 get(InvocationProperty.MAVEN_EXECUTABLE, index).map(File::new).orElse(defaultMavenExecutable));
 
         setIfNotNull(
                 request::setMavenOpts, get(InvocationProperty.MAVEN_OPTS, index).orElse(defaultMavenOpts));
 
         get(InvocationProperty.FAILURE_BEHAVIOR, index)
                 .map(InvocationRequest.ReactorFailureBehavior::valueOfByLongOption)
                 .ifPresent(request::setReactorFailureBehavior);
 
         get(InvocationProperty.NON_RECURSIVE, index)
                 .map(Boolean::parseBoolean)
                 .map(b -> !b)
                 .ifPresent(request::setRecursive);
 
         get(InvocationProperty.OFFLINE, index).map(Boolean::parseBoolean).ifPresent(request::setOffline);
 
         setIfNotNull(
                 request::setDebug,
                 get(InvocationProperty.DEBUG, index).map(Boolean::parseBoolean).orElse(defaultDebug));
 
         setIfNotNull(
                 request::setQuiet,
                 get(InvocationProperty.QUIET, index).map(Boolean::parseBoolean).orElse(defaultQuiet));
 
         setIfNotNull(
                 request::setTimeoutInSeconds,
                 get(InvocationProperty.TIMEOUT_IN_SECONDS, index)
                         .map(Integer::parseInt)
                         .orElse(defaultTimeoutInSeconds));
 
         setIfNotNull(
                 request::setUpdateSnapshots,
                 get(InvocationProperty.UPDATE_SNAPSHOTS, index)
                         .map(Boolean::parseBoolean)
                         .orElse(defaultUpdateSnapshots));
 
         Optional.ofNullable(defaultEnvironmentVariables).ifPresent(evn -> evn.forEach(request::addShellEnvironment));
 
         getEnvironmentVariables(index).forEach(request::addShellEnvironment);
     }
 
     /**
      * Checks whether the specified exit code matches the one expected for the given invocation.
      *
      * @param exitCode The exit code of the Maven invocation to check.
      * @param index The index of the invocation for which to check the exit code, must not be negative.
      * @return <code>true</code> if the exit code is zero and a success was expected or if the exit code is non-zero and
      *         a failue was expected, <code>false</code> otherwise.
      */
     public boolean isExpectedResult(int exitCode, int index) {
         boolean nonZeroExit = "failure"
                 .equalsIgnoreCase(get(InvocationProperty.BUILD_RESULT, index).orElse(null));
         return (exitCode != 0) == nonZeroExit;
     }
 
     /**
      * Gets the path to the properties file used to set the system properties for the specified invocation.
      *
      * @param index The index of the invocation, must not be negative.
      * @return The path to the properties file or <code>null</code> if not set.
      */
     public String getSystemPropertiesFile(int index) {
         return get(InvocationProperty.SYSTEM_PROPERTIES_FILE, index).orElse(null);
     }
 
     /**
      * Gets the settings file used for the specified invocation.
      *
      * @param index The index of the invocation, must not be negative.
      * @return the value for the settings file or <code>null</code> if not set.
      */
     public String getSettingsFile(int index) {
         return get(InvocationProperty.SETTINGS_FILE, index).orElse(null);
     }
 
     /**
      * Gets a value from the invoker properties. The invoker properties are intended to describe the invocation settings
      * for multiple builds of the same project. For this reason, the properties are indexed. First, a property named
      * <code>key.index</code> will be queried. If this property does not exist, the value of the property named
      * <code>key</code> will finally be returned.
      *
      * @param key The (base) key for the invoker property to lookup, must not be <code>null</code>.
      * @param index The index of the invocation for which to retrieve the value, must not be negative.
      * @return The value for the requested invoker property or <code>null</code> if not defined.
      */
     Optional<String> get(String key, int index) {
         if (index < 0) {
             throw new IllegalArgumentException("invalid invocation index: " + index);
         }
 
         // lookup in properties
         String value = Optional.ofNullable(properties.getProperty(key + '.' + index))
                 .orElseGet(() -> properties.getProperty(key));
 
         return Optional.ofNullable(value).map(String::trim).filter(s -> !s.isEmpty());
     }
 
     private Optional<String> get(InvocationProperty prop, int index) {
         return get(prop.toString(), index);
     }
 }