/*
 * 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.
 */

// generate javadocs by calling javadoc tool
// see https://docs.oracle.com/en/java/javase/11/tools/javadoc.html

// utility function to convert project path to document dir
// e.g.: ':lucene:analysis:common' => 'analysis/common'
def pathToDocdir = { path -> path.split(':').drop(2).join('/') }

allprojects {
  plugins.withType(JavaPlugin) {
    task renderJavadoc {
      description "Generates Javadoc API documentation for the main source code. This directly invokes javadoc tool."
      group "documentation"

      ext {
        linksource = false
        linkJUnit = false
        linkLuceneProjects = []
        linkSorlProjects = []
      }

      dependsOn sourceSets.main.compileClasspath

      inputs.files { sourceSets.main.java.asFileTree }
      outputs.dir project.javadoc.destinationDir

      def libName = project.path.startsWith(":lucene") ? "Lucene" : "Solr"
      def title = "${libName} ${project.version} ${project.name} API".toString()

      // absolute urls for "-linkoffline" option
      def javaSEDocUrl = "https://docs.oracle.com/en/java/javase/11/docs/api/"
      def junitDocUrl = "https://junit.org/junit4/javadoc/4.12/"
      def luceneDocUrl = "https://lucene.apache.org/core/${project.version.replace(".", "_")}".toString()
      def solrDocUrl = "https://lucene.apache.org/solr/${project.version.replace(".", "_")}".toString()

      def javadocCmd = org.gradle.internal.jvm.Jvm.current().getJavadocExecutable()

      def optionsFile = file("${getTemporaryDir()}/javadoc-options.txt")

      doFirst {
        def srcDirs = sourceSets.main.java.srcDirs.findAll { dir -> dir.exists() }

        def opts = []
        opts += [ "-overview ${file("src/java/overview.html").toString()}" ]
        opts += [ "-sourcepath ${srcDirs.join(' ')}" ]
        opts += [ "-subpackages ${project.path.startsWith(':lucene') ? 'org.apache.lucene' : 'org.apache.solr'}"]
        opts += [ "-d ${project.javadoc.destinationDir.toString()}" ]
        opts += [ "-protected" ]
        opts += [ "-encoding UTF-8" ]
        opts += [ "-charset UTF-8" ]
        opts += [ "-docencoding UTF-8" ]
        opts += [ "-noindex" ]
        opts += [ "-author" ]
        opts += [ "-version" ]
        if (linksource) {
          opts += [ "-linksource" ]
        }
        opts += [ "-use" ]
        opts += [ "-locale en_US" ]
        opts += [ "-windowtitle '${title}'" ]
        opts += [ "-doctitle '${title}'" ]
        if (!sourceSets.main.compileClasspath.isEmpty()) {
          opts += ["-classpath ${sourceSets.main.compileClasspath.asPath}" ]
        }
        opts += [ "-bottom '<i>Copyright &copy; 2000-${buildYear} Apache Software Foundation. All Rights Reserved.</i>'" ]

        opts += [ "-tag 'lucene.experimental:a:WARNING: This API is experimental and might change in incompatible ways in the next release.'" ]
        opts += [ "-tag 'lucene.internal:a:NOTE: This API is for internal purposes only and might change in incompatible ways in the next release.'" ]
        opts += [ "-tag 'lucene.spi:t:SPI Name (case-insensitive: if the name is 'htmlStrip', 'htmlstrip' can be used when looking up the service).'" ]

        // resolve links to JavaSE and JUnit API
        opts += [ "-linkoffline ${javaSEDocUrl} ${project(':lucene').file('tools/javadoc/java11/').toString()}" ]
        if (linkJUnit) {
          opts += [ "-linkoffline ${junitDocUrl} ${project(':lucene').file('tools/javadoc/junit').toURL()}" ]
        }
        // resolve inter-project links
        linkLuceneProjects.collect { path ->
          opts += [ "-linkoffline ${luceneDocUrl}/${pathToDocdir(path)} ${file(project(path).javadoc.destinationDir).toString()}" ]
        }
        linkSorlProjects.collect { path ->
          opts += [ "-linkoffline ${solrDocUrl}/${pathToDocdir(path)} ${file(project(path).javadoc.destinationDir).toString()}" ]
        }

        opts += [ "--release 11" ]
        opts += [ "-Xdoclint:all,-missing" ]

        // Temporary file that holds all javadoc options for the current task.
        optionsFile.write(opts.join("\n"), "UTF-8")

        def outputFile = file("${getTemporaryDir()}/javadoc-output.txt")
        def result
        outputFile.withOutputStream { output ->
          result = project.exec {
            executable javadocCmd

            standardOutput = output
            errorOutput = output

            args += [ "@${optionsFile}" ]

            // -J flags can't be passed via options file... (an error "javadoc: error - invalid flag: -J-Xmx512m" occurs.)
            args += [ "-J-Xmx512m" ]
            // force locale to be "en_US" (fix for: https://bugs.openjdk.java.net/browse/JDK-8222793)
            args += [ "-J-Duser.language=en -J-Duser.country=US" ]

            ignoreExitValue true
          }
        }

        if (result.getExitValue() != 0) {
          // Pipe the output to console. Intentionally skips any encoding conversion 
          // and pumps raw bytes.
          System.out.write(outputFile.bytes)

          def cause
          try {
            result.rethrowFailure()
          } catch (ex) {
            cause = ex
          }
          throw new GradleException("Javadoc generation failed for ${project.path},\n  Options file at: ${optionsFile}\n  Command output at: ${outputFile}", cause)
        }

        // append some special table css, prettify css
        ant.concat(destfile: "${project.javadoc.destinationDir}/stylesheet.css", append: "true", fixlastline: "true", encoding: "UTF-8") {
          filelist(dir: project(":lucene").file("tools/javadoc"), files: "table_padding.css")
          filelist(dir: project(":lucene").file("tools/prettify"), files: "prettify.css")
        }
        // append prettify to scripts
        ant.concat(destfile: "${project.javadoc.destinationDir}/script.js", append: "true", fixlastline: "true", encoding: "UTF-8") {
          filelist(dir: project(':lucene').file("tools/prettify"), files: "prettify.js inject-javadocs.js")
        }
        ant.fixcrlf(srcdir: project.javadoc.destinationDir, includes: "stylesheet.css script.js", eol: "lf", fixlast: "true", encoding: "UTF-8")

      }
    }
  }
}

configure(subprojects.findAll { it.path.startsWith(':lucene') && it.path != ':lucene:core' }) {

  plugins.withType(JavaPlugin) {
    renderJavadoc {
      [':lucene:core'].collect { path ->
        dependsOn "${path}:renderJavadoc"
        linkLuceneProjects += [ path ]
      }

      doLast {
        // fix for Java 11 Javadoc tool that cannot handle split packages between modules correctly (by removing all the packages which are part of lucene-core)
        // problem description: [https://issues.apache.org/jira/browse/LUCENE-8738?focusedCommentId=16818106&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16818106]
        ant.local(name: "element-list-regex") // contains a regex for all package names which are in lucene-core's javadoc
        ant.loadfile(property: "element-list-regex", srcFile: "${project(':lucene:core').javadoc.destinationDir}/element-list", encoding: "utf-8") {
          filterchain {
            tokenfilter(delimoutput: "|") {
              replacestring(from: ".", to: "\\.")
            }
          }
        }
        ant.replaceregexp(
            encoding: "UTF-8",
            file: "${project.javadoc.destinationDir}/element-list",
            byline: "true",
            match: "^(\${element-list-regex})\$",
            replace: "")
      }
    }
  }
}

configure(subprojects.findAll { it.path.startsWith(':lucene:analysis') && it.path != ':lucene:analysis:common'}) {
  plugins.withType(JavaPlugin) {
    renderJavadoc {
      [':lucene:analysis:common'].collect { path ->
        dependsOn "${path}:renderJavadoc"
        linkLuceneProjects += [ path ]
      }
    }
  }
}

configure(project(':lucene:benchmark')) {
  plugins.withType(JavaPlugin) {
    renderJavadoc {
      [':lucene:memory',
       ':lucene:highlighter',
       ':lucene:analysis:common',
       ':lucene:queryparser',
       ':lucene:facet',
       ':lucene:spatial-extras'].collect { path ->
        dependsOn "${path}:renderJavadoc"
        linkLuceneProjects += [ path ]
      }
    }
  }
}

configure(project(':lucene:classification')) {
  plugins.withType(JavaPlugin) {
    renderJavadoc {
      [':lucene:queries', ':lucene:analysis:common', ':lucene:grouping'].collect { path ->
        dependsOn "${path}:renderJavadoc"
        linkLuceneProjects += [ path ]
      }
    }
  }
}

configure(project(':lucene:demo')) {
  plugins.withType(JavaPlugin) {
    renderJavadoc {
      [':lucene:analysis:common',
       ':lucene:queryparser',
       ':lucene:queries',
       ':lucene:facet',
       ':lucene:expressions'].collect { path ->
        dependsOn "${path}:renderJavadoc"
        linkLuceneProjects += [ path ]
      }

      // we link the example source in the javadocs, as it's ref'ed elsewhere
      linksource = true
    }
  }
}

configure(project(':lucene:grouping')) {
  plugins.withType(JavaPlugin) {
    renderJavadoc {
      [':lucene:queries'].collect { path ->
        dependsOn "${path}:renderJavadoc"
        linkLuceneProjects += [ path ]
      }
    }
  }
}

configure(project(':lucene:highlighter')) {
  plugins.withType(JavaPlugin) {
    renderJavadoc {
      [':lucene:memory'].collect { path ->
        dependsOn "${path}:renderJavadoc"
        linkLuceneProjects += [ path ]
      }
    }
  }
}

configure(project(':lucene:monitor')) {
  plugins.withType(JavaPlugin) {
    renderJavadoc {
      [':lucene:memory', ':lucene:analysis:common', ':lucene:queryparser'].collect { path ->
        dependsOn "${path}:renderJavadoc"
        linkLuceneProjects += [ path ]
      }
    }
  }
}

configure(project(':lucene:queryparser')) {
  plugins.withType(JavaPlugin) {
    renderJavadoc {
      [':lucene:queries', ':lucene:sandbox'].collect { path ->
        dependsOn "${path}:renderJavadoc"
        linkLuceneProjects += [ path ]
      }
    }
  }
}

configure(project(':lucene:replicator')) {
  plugins.withType(JavaPlugin) {
    renderJavadoc {
      [':lucene:facet'].collect { path ->
        dependsOn "${path}:renderJavadoc"
        linkLuceneProjects += [ path ]
      }
    }
  }
}

configure(project(':lucene:spatial-extras')) {
  plugins.withType(JavaPlugin) {
    renderJavadoc {
      [':lucene:spatial3d'].collect { path ->
        dependsOn "${path}:renderJavadoc"
        linkLuceneProjects += [ path ]
      }
    }
  }
}

configure(project(':lucene:suggest')) {
  plugins.withType(JavaPlugin) {
    renderJavadoc {
      [':lucene:analysis:common'].collect { path ->
        dependsOn "${path}:renderJavadoc"
        linkLuceneProjects += [ path ]
      }
    }
  }
}

configure(project(':lucene:test-framework')) {
  plugins.withType(JavaPlugin) {

    renderJavadoc {
      [':lucene:codecs'].collect { path ->
        dependsOn "${path}:renderJavadoc"
        linkLuceneProjects += [ path ]
      }
      linkJUnit = true
    }
  }
}

configure(subprojects.findAll { it.path.startsWith(':solr') }) {
  plugins.withType(JavaPlugin) {
    def hasJavdocsTask = project.tasks.collect { it.name }.contains('renderJavadoc')
    if (hasJavdocsTask) {
      renderJavadoc {
        [':lucene:core',
         ':lucene:analysis:common',
         ':lucene:analysis:icu',
         ':lucene:analysis:kuromoji',
         ':lucene:analysis:nori',
         ':lucene:analysis:morfologik',
         ':lucene:analysis:phonetic',
         ':lucene:analysis:smartcn',
         ':lucene:analysis:stempel',
         ':lucene:backward-codecs',
         ':lucene:codecs',
         ':lucene:expressions',
         ':lucene:suggest',
         ':lucene:grouping',
         ':lucene:join',
         ':lucene:queries',
         ':lucene:queryparser',
         ':lucene:highlighter',
         ':lucene:memory',
         ':lucene:misc',
         ':lucene:classification',
         ':lucene:spatial-extras'].collect { path ->
          dependsOn "${path}:renderJavadoc"
          linkLuceneProjects += [ path ]
        }
      }
    }
  }
}

configure(project(':solr:core')) {
  plugins.withType(JavaPlugin) {
    // specialized to ONLY depend on solrj
    renderJavadoc {
      [':solr:solrj'].collect { path ->
        dependsOn "${path}:renderJavadoc"
        linkSorlProjects += [ path ]
      }
    }
  }
}

configure(subprojects.findAll { it.path.startsWith(':solr:contrib') }) {
  plugins.withType(JavaPlugin) {
    renderJavadoc {
      [':solr:solrj', ':solr:core'].collect { path ->
        dependsOn "${path}:renderJavadoc"
        linkSorlProjects += [ path ]
      }
    }
  }
}

configure(project(':solr:contrib:dataimporthandler-extras')) {
  plugins.withType(JavaPlugin) {
    renderJavadoc {
      [':solr:contrib:dataimporthandler'].collect { path ->
        dependsOn "${path}:renderJavadoc"
        linkSorlProjects += [ path ]
      }
    }
  }
}

configure(project(':solr:test-framework')) {
  plugins.withType(JavaPlugin) {
    renderJavadoc {
      linkJUnit = true
    }
  }
}


configure(subprojects.findAll { it.path in [':solr:solr-ref-guide', ':solr:server', ':solr:webapp']}) {
  afterEvaluate {
    project.tasks.findByPath("renderJavadoc").enabled = false
  }
}