// TODO 1: the separation of sources between tools and refGuide is awkward; it'd be
// better to separate the refGuideTools as a plain Java module and then depend on
// it as a project dependency. This would enable this module to *not* be a java module at all
// and inherit from base, adding just refGuide-related tasks.
// OR (better) one could rewrite those tools in Groovy (or Kotlin) and use them directly, without
// an additional compilation phase.

// TODO 2: property expansion via ant properties is awkward in gradle. We can do cleaner than going
// through ant -- we could use gradle's expand when copying or at least use some more humane
// property names.

// TODO 3: task names currently roughly correspond to ant tasks. Simpler aliases (such as 'html')
// would be much clearer.

// TODO 4: currently buildscript dependencies are hardcoded (asciidoctor) because they can't be resolved
// using Palantir's plugin. This is another reason to switch to gradle-based tools -- then
// only the build script dependencies would be needed and asciidoctorj would be removed from version
// properties entirely (it is only used locally in this build file).

import java.time.*
import java.time.format.*
import java.nio.file.*
import org.asciidoctor.*

buildscript {
    repositories {
        mavenCentral()
    }

    dependencies {
        classpath "org.asciidoctor:asciidoctorj:1.6.2"
    }
}

plugins {
    id 'java'
    id 'com.github.jruby-gradle.base' version '1.6.0'
}

configurations {
    depVer
    refGuide
}

dependencies {
    // Dependencies to compile internal tools.
    implementation('org.asciidoctor:asciidoctorj')
    implementation('com.vaadin.external.google:android-json')
    implementation('org.jsoup:jsoup')
    implementation('org.slf4j:jcl-over-slf4j')
    implementation('org.slf4j:slf4j-simple')
    implementation('org.apache.logging.log4j:log4j-core')
    implementation('com.google.guava:guava')
    implementation('commons-codec:commons-codec')

    // Dependencies referenced in the guide.
    depVer('commons-codec:commons-codec')
    depVer('io.dropwizard.metrics:metrics-core')
    depVer('org.apache.logging.log4j:log4j-core')
    depVer('org.apache.opennlp:opennlp-tools')
    depVer('org.apache.tika:tika-core')
    depVer('org.apache.velocity.tools:velocity-tools-generic')
    depVer('org.apache.zookeeper:zookeeper')

    // jekyll dependencies
    jrubyExec 'rubygems:jekyll:3.5.2'
    jrubyExec 'rubygems:jekyll-asciidoc:3.0.0'

    // don't know why we have to explicitly add these deps but it doesn't resolve them
    // automatically.
    jrubyExec 'rubygems:tilt:2.0.10'
    jrubyExec 'rubygems:slim:4.0.1'
    jrubyExec 'rubygems:concurrent-ruby:1.0.5'
}

sourceSets {
    refGuide {
        java {
            srcDirs = ['src']
        }
    }

    main {
        java {
            srcDirs = ['tools']
            exclude "**/CustomizedAsciidoctorAntTask.java"
            exclude "**/asciidoctor-antlib.xml"
        }
    }
}

ext {
    buildContentDir = file("${buildDir}/content")
    mainPage = "index"

    solrDocsVersion = "${version}".replaceAll(/^(\d+\.\d+)(|\..*)$/, "\$1")
    solrDocsVersionPath = "${solrDocsVersion}".replaceAll(/^(\d+)\.(\d+)$/, "\$1_\$2_0")

    if (!project.hasProperty("solrGuideVersion")) {
        solrGuideVersion = "${solrDocsVersion}-DRAFT"
    }

    solrRootPath = '../../../../solr/'
    solrGuideDraftStatus = solrGuideVersion.matches(/^\d+\.\d+(|\.\d+)$/) ? "" : "DRAFT"
    solrGuideVersionPath = solrGuideVersion.replaceAll(/^(\d+)\.(\d+)(-DRAFT)?.*/, "\$1_\$2\$3")

    javadocLink = "https://docs.oracle.com/en/java/javase/11/docs/api/"

    if (project.hasProperty("local.javadocs")) {
        htmlSolrJavadocs = "link:../../docs/"
        htmlLuceneJavadocs = "link:../../../../lucene/build/docs/"
    } else {
        htmlSolrJavadocs = "https://lucene.apache.org/solr/${solrDocsVersionPath}/"
        htmlLuceneJavadocs = "https://lucene.apache.org/core/${solrDocsVersionPath}/"
    }

    bareBonesDir = file("${buildDir}/bare-bones-html")

    def tstamp = ZonedDateTime.now()
    buildDate = DateTimeFormatter.ofPattern("yyyy-MM-dd").format(tstamp)
    buildTime = DateTimeFormatter.ofPattern("HH:mm:ss").format(tstamp)
    buildYear = DateTimeFormatter.ofPattern("yyyy").format(tstamp)

    // Some additional version properties are lazily computed
    // in setupProps (because they need to be computed after evalution is complete).
    props = [
            "solr-root-path"         : solrRootPath,
            "solr-guide-draft-status": solrGuideDraftStatus,
            "solr-guide-version"     : solrGuideVersion,
            "solr-guide-version-path": solrGuideVersionPath,
            "solr-docs-version"      : solrDocsVersion,
            "javadoc.link"           : javadocLink,
            "java-javadocs"          : javadocLink,
            "solr-javadocs"          : htmlSolrJavadocs,
            "html-solr-javadocs"     : htmlSolrJavadocs,
            "lucene-javadocs"        : htmlLuceneJavadocs,
            "html-lucene-javadocs"   : htmlLuceneJavadocs,
            "build-date"             : buildDate,
            "DSTAMP"                 : buildDate,
            "build-year"             : buildYear,
            "current.year"           : buildYear
    ]

    asciiDocAttrs = [
            'common': [
                    'attribute-missing' : 'warn',
                    'section-toc'       : '',
                    'icons'             : 'font',
                    'icon-set'          : 'fa',
                    'figure-caption!'   : '',
                    'idprefix'          : '',
                    'idseparator'       : '-',
                    'source-highlighter': 'coderay',
                    'solr-root-path'    : solrRootPath,
            ],
            'html'  : [
                    'imagesdir': buildContentDir.toString()
            ]
    ]
}

// Tasks modeled after ant file until we have a working build.

task setupProps {
    doFirst {
        // These properties have to be resolved after configuration phase (palantir's constraint)
        // so we can't use them as input for caches.
        [
                ["ivyversions./commons-codec/commons-codec", "commons-codec", "commons-codec"],
                ["ivyversions.io.dropwizard.metrics.version", "io.dropwizard.metrics", "metrics-core"],
                ["ivyversions.org.apache.logging.log4j.version", "org.apache.logging.log4j", "log4j-core"],
                ["ivyversions./org.apache.opennlp/opennlp-tools", "org.apache.opennlp", "opennlp-tools"],
                ["ivyversions.org.apache.tika.version", "org.apache.tika", "tika-core"],
                ["ivyversions.org.apache.velocity.tools.version", "org.apache.velocity.tools", "velocity-tools-generic"],
                ["ivyversions./org.apache.zookeeper/zookeeper", "org.apache.zookeeper", "zookeeper"],

                ["ivy-zookeeper-version", "org.apache.zookeeper", "zookeeper"],
                ["ivy-log4j-version", "org.apache.logging.log4j", "log4j-core"],
                ["ivy-tika-version", "org.apache.tika", "tika-core"],
                ["ivy-opennlp-version", "org.apache.opennlp", "opennlp-tools"],
                ["ivy-commons-codec-version", "commons-codec", "commons-codec"],
                ["ivy-velocity-tools-version", "org.apache.velocity.tools", "velocity-tools-generic"],
                ["ivy-dropwizard-version", "io.dropwizard.metrics", "metrics-core"]
        ].each { antProp, depGroup, depId ->
            props[antProp] = getVersion(depGroup, depId, configurations.depVer)
        }

        // Emit info about properties for clarity.
        logger.warn("Building ref guide with:\n" + props.collect({ k, v -> "  ${k} -> ${v}" }).join('\n'))
    }
}

task buildInit(type: Sync) {
    dependsOn setupProps

    def dummyAntProject = new org.apache.tools.ant.Project()

    // If replaceable properties change, we have to rerun.
    inputs.properties props

    from(file("src"), {
        exclude '**/*.template'
    })

    from(file("src"), {
        include '**/*.template'
        rename '(.+)\\.template', '$1'
        filteringCharset = 'UTF-8'
        filter(org.apache.tools.ant.filters.ExpandProperties, project: dummyAntProject)
    })

    doFirst {
        props.each { k, v ->
          dummyAntProject.setProperty(k, v)
        }
    }

    into buildContentDir
}

task buildNavDataFiles(type: JavaExec) {
    dependsOn buildInit, classes
    classpath = sourceSets.main.runtimeClasspath

    main = 'BuildNavDataFiles'
    workingDir = buildContentDir

    args([
            "${buildContentDir}",
            "${mainPage}"
    ])

    doFirst {
        // Remove previously generated files first.
        [
                "scrollnav.json",
                "sidebar.json"
        ].each { name ->
            project.delete(file("${buildContentDir}/_data/${name}"))
        }
    }
}

task bareBonesAsciiDoctor {
    dependsOn buildNavDataFiles

    doLast {
        // Regenerate fully.
        project.delete(bareBonesDir)
        bareBonesDir.mkdirs()

        // Convert each file separately so that folders are preserved.
        Path source = buildContentDir.toPath().toAbsolutePath().normalize()
        Path target = bareBonesDir.toPath().toAbsolutePath().normalize()

        Asciidoctor adoc = Asciidoctor.Factory.create()
        fileTree(source, {
            include "**/*.adoc"
            exclude "**/_*"
        }).each { file ->
            Path relative = source.relativize(file.toPath())
            Path targetDir = target.resolve(relative).getParent()

            def opts = OptionsBuilder.options()
                    .backend('html5')
                    .docType("book")
                    .headerFooter(false)
                    .safe(SafeMode.UNSAFE)
                    .baseDir(source.toFile())
                    .toDir(targetDir.toFile())
                    .destinationDir(targetDir.toFile())
                    .mkDirs(true)
                    .attributes(asciiDocAttrs.common + asciiDocAttrs.html + props)

            adoc.convertFile(file, opts)
        }
    }
}

task bareBonesHtmlValidation(type: JavaExec) {
    dependsOn bareBonesAsciiDoctor
    description("Builds (w/o Jekyll) a very simple html version of the guide and runs link/anchor validation on it")

    classpath = sourceSets.main.runtimeClasspath
    main = 'CheckLinksAndAnchors'
    workingDir = buildContentDir

    args([
            "${bareBonesDir}",
            "-bare-bones"
    ])

    if (project.hasProperty("local.javadocs")) {
        args += "-check-all-relative-links"
    }
}

task buildSiteJekyll(type: com.github.jrubygradle.JRubyExec) {
    dependsOn buildNavDataFiles

    inputs.dir buildContentDir
    outputs.dir file("${buildDir}/html-site")

    script 'jekyll'
    scriptArgs 'build' //, '--verbose'
    workingDir buildContentDir
}

task buildSite(type: JavaExec) {
    group "Documentation"
    description "Builds an HTML Site w/Jekyll and verifies the anchors+links are valid"

    dependsOn buildSiteJekyll

    classpath = sourceSets.main.runtimeClasspath
    main = 'CheckLinksAndAnchors'
    workingDir = buildContentDir

    args([
            file("${buildDir}/html-site"),
    ])

    if (project.hasProperty("local.javadocs")) {
        args += "-check-all-relative-links"
    }
}

check.dependsOn bareBonesHtmlValidation