package org.jetbrains.dokka.maven

import org.apache.maven.archiver.MavenArchiveConfiguration
import org.apache.maven.archiver.MavenArchiver
import org.apache.maven.artifact.DefaultArtifact
import org.apache.maven.artifact.handler.DefaultArtifactHandler
import org.apache.maven.artifact.resolver.ArtifactResolutionRequest
import org.apache.maven.artifact.resolver.ArtifactResolutionResult
import org.apache.maven.artifact.resolver.ResolutionErrorHandler
import org.apache.maven.execution.MavenSession
import org.apache.maven.model.Dependency
import org.apache.maven.plugin.AbstractMojo
import org.apache.maven.plugin.MojoExecutionException
import org.apache.maven.plugins.annotations.*
import org.apache.maven.project.MavenProject
import org.apache.maven.project.MavenProjectHelper
import org.apache.maven.repository.RepositorySystem
import org.codehaus.plexus.archiver.Archiver
import org.codehaus.plexus.archiver.jar.JarArchiver
import org.codehaus.plexus.util.xml.Xpp3Dom
import org.jetbrains.dokka.*
import org.jetbrains.dokka.DokkaConfiguration.ExternalDocumentationLink
import java.io.File
import java.net.URL

class SourceLinkMapItem {
    @Parameter(name = "path", required = true)
    var path: String = ""

    @Parameter(name = "url", required = true)
    var url: String = ""

    @Parameter(name = "lineSuffix")
    var lineSuffix: String? = null
}

class ExternalDocumentationLinkBuilder {

    @Parameter(name = "url", required = true)
    var url: URL? = null

    @Parameter(name = "packageListUrl", required = true)
    var packageListUrl: URL? = null

    fun build() = ExternalDocumentationLink(url, packageListUrl)
}

abstract class AbstractDokkaMojo(private val defaultDokkaPlugins: List<Dependency>) : AbstractMojo() {

    @Parameter(defaultValue = "\${project}", readonly = true, required = true)
    protected var mavenProject: MavenProject? = null

    /**
     * The current build session instance. This is used for
     * dependency resolver API calls via repositorySystem.
     */
    @Parameter(defaultValue = "\${session}", required = true, readonly = true)
    protected var session: MavenSession? = null

    @Component
    private var repositorySystem: RepositorySystem? = null

    @Component
    private var resolutionErrorHandler: ResolutionErrorHandler? = null

    class PackageOptions : DokkaConfiguration.PackageOptions {
        @Parameter
        override var matchingRegex: String = ".*"

        @Parameter
        override var includeNonPublic: Boolean = DokkaDefaults.includeNonPublic

        @Parameter
        override var reportUndocumented: Boolean = DokkaDefaults.reportUndocumented

        @Parameter
        override var skipDeprecated: Boolean = DokkaDefaults.skipDeprecated

        @Parameter
        override var suppress: Boolean = DokkaDefaults.suppress

        @Parameter(property = "visibility")
        override var documentedVisibilities: Set<DokkaConfiguration.Visibility> = DokkaDefaults.documentedVisibilities
    }

    @Parameter
    var sourceSetName: String = "JVM"

    @Parameter(required = true, defaultValue = "\${project.compileSourceRoots}")
    var sourceDirectories: List<String> = emptyList()

    @Parameter
    var samples: List<String> = emptyList()

    @Parameter
    var includes: List<String> = emptyList()

    @Parameter(required = true, defaultValue = "\${project.compileClasspathElements}")
    var classpath: List<String> = emptyList()

    @Parameter
    var sourceLinks: List<SourceLinkMapItem> = emptyList()

    @Parameter(required = true, defaultValue = "\${project.artifactId}")
    var moduleName: String = ""

    @Parameter(required = false, defaultValue = "false")
    var skip: Boolean = false

    @Parameter(required = false, defaultValue = "${DokkaDefaults.jdkVersion}")
    var jdkVersion: Int = DokkaDefaults.jdkVersion

    @Parameter
    var skipDeprecated: Boolean = DokkaDefaults.skipDeprecated

    @Parameter
    var skipEmptyPackages: Boolean = DokkaDefaults.skipEmptyPackages

    @Parameter
    var reportUndocumented: Boolean = DokkaDefaults.reportUndocumented

    @Parameter
    var perPackageOptions: List<PackageOptions> = emptyList()

    @Parameter
    var externalDocumentationLinks: List<ExternalDocumentationLinkBuilder> = emptyList()

    @Parameter(defaultValue = "${DokkaDefaults.noStdlibLink}")
    var noStdlibLink: Boolean = DokkaDefaults.noStdlibLink

    @Parameter(defaultValue = "${DokkaDefaults.noJdkLink}")
    var noJdkLink: Boolean = DokkaDefaults.noJdkLink

    @Parameter
    var cacheRoot: String? = null

    @Parameter(defaultValue = "JVM")
    var displayName: String = "JVM"

    @Parameter(defaultValue = "${DokkaDefaults.offlineMode}")
    var offlineMode: Boolean = DokkaDefaults.offlineMode

    @Parameter
    var languageVersion: String? = null

    @Parameter
    var apiVersion: String? = null

    @Parameter
    var suppressedFiles: List<String> = emptyList()

    @Parameter
    var platform: String = ""

    @Parameter
    var includeNonPublic: Boolean = DokkaDefaults.includeNonPublic

    @Parameter(property = "visibility")
    var documentedVisibilities: Set<DokkaConfiguration.Visibility> = DokkaDefaults.documentedVisibilities
        // hack to set the default value for lists, didn't find any other safe way
        // maven seems to overwrite Kotlin's default initialization value, so it doesn't matter what you put there
        get() = field.ifEmpty { DokkaDefaults.documentedVisibilities }

    @Parameter
    var failOnWarning: Boolean = DokkaDefaults.failOnWarning

    @Parameter(defaultValue = "${DokkaDefaults.suppressObviousFunctions}")
    var suppressObviousFunctions: Boolean = DokkaDefaults.suppressObviousFunctions

    @Parameter(defaultValue = "${DokkaDefaults.suppressInheritedMembers}")
    var suppressInheritedMembers: Boolean = DokkaDefaults.suppressInheritedMembers

    @Parameter
    var dokkaPlugins: List<Dependency> = emptyList()
        get() = field + defaultDokkaPlugins

    protected abstract fun getOutDir(): String

    override fun execute() {
        if (skip) {
            log.info("Dokka skip parameter is true so no dokka output will be produced")
            return
        }

        sourceLinks.forEach {
            if (it.path.contains("\\")) {
                throw MojoExecutionException("Incorrect path property, only Unix based path allowed.")
            }
        }

        fun defaultLinks(config: DokkaSourceSetImpl): Set<ExternalDocumentationLinkImpl> {
            val links = mutableSetOf<ExternalDocumentationLinkImpl>()
            if (!config.noJdkLink)
                links += ExternalDocumentationLink.jdk(jdkVersion)

            if (!config.noStdlibLink)
                links += ExternalDocumentationLink.kotlinStdlib()
            return links
        }

        val sourceSet = DokkaSourceSetImpl(
            displayName = displayName,
            sourceSetID = DokkaSourceSetID(moduleName, sourceSetName),
            classpath = classpath.map(::File),
            sourceRoots = sourceDirectories.map(::File).toSet(),
            dependentSourceSets = emptySet(),
            samples = samples.map(::File).toSet(),
            includes = includes.map(::File).toSet(),
            includeNonPublic = includeNonPublic,
            documentedVisibilities = documentedVisibilities,
            reportUndocumented = reportUndocumented,
            skipEmptyPackages = skipEmptyPackages,
            skipDeprecated = skipDeprecated,
            jdkVersion = jdkVersion,
            sourceLinks = sourceLinks.map { SourceLinkDefinitionImpl(it.path, URL(it.url), it.lineSuffix) }.toSet(),
            perPackageOptions = perPackageOptions.map {
                PackageOptionsImpl(
                    matchingRegex = it.matchingRegex,
                    includeNonPublic = it.includeNonPublic,
                    documentedVisibilities = it.documentedVisibilities,
                    reportUndocumented = it.reportUndocumented,
                    skipDeprecated = it.skipDeprecated,
                    suppress = it.suppress
                )
            },
            externalDocumentationLinks = externalDocumentationLinks.map { it.build() }.toSet(),
            languageVersion = languageVersion,
            apiVersion = apiVersion,
            noStdlibLink = noStdlibLink,
            noJdkLink = noJdkLink,
            suppressedFiles = suppressedFiles.map(::File).toSet(),
            analysisPlatform = if (platform.isNotEmpty()) Platform.fromString(platform) else Platform.DEFAULT,
        ).let {
            it.copy(
                externalDocumentationLinks = defaultLinks(it) + it.externalDocumentationLinks
            )
        }

        val logger = MavenDokkaLogger(log)

        val pluginsConfiguration =
            (mavenProject?.getPlugin("org.jetbrains.dokka:dokka-maven-plugin")?.configuration as? Xpp3Dom)
                ?.getChild("pluginsConfiguration")?.children?.map {
                    PluginConfigurationImpl(
                        it.name,
                        DokkaConfiguration.SerializationFormat.XML,
                        it.toString()
                    )
                }.orEmpty()

        val configuration = DokkaConfigurationImpl(
            moduleName = moduleName,
            outputDir = File(getOutDir()),
            offlineMode = offlineMode,
            cacheRoot = cacheRoot?.let(::File),
            sourceSets = listOf(sourceSet),
            pluginsClasspath = getArtifactByMaven("org.jetbrains.dokka", "dokka-base", dokkaVersion) +
                    dokkaPlugins.map { getArtifactByMaven(it.groupId, it.artifactId, it.version ?: dokkaVersion) }
                        .flatten(),
            pluginsConfiguration = pluginsConfiguration.toMutableList(),
            modules = emptyList(),
            failOnWarning = failOnWarning,
            suppressObviousFunctions = suppressObviousFunctions,
            suppressInheritedMembers = suppressInheritedMembers,
        )

        val gen = DokkaGenerator(configuration, logger)

        gen.generate()
    }

    private fun getArtifactByMaven(
        groupId: String,
        artifactId: String,
        version: String
    ): List<File> {

        val request = ArtifactResolutionRequest().apply {
            isResolveRoot = true
            isResolveTransitively = true
            localRepository = session!!.localRepository
            remoteRepositories = mavenProject!!.pluginArtifactRepositories
            isOffline = session!!.isOffline
            isForceUpdate = session!!.request.isUpdateSnapshots
            servers = session!!.request.servers
            mirrors = session!!.request.mirrors
            proxies = session!!.request.proxies
            artifact = DefaultArtifact(
                groupId, artifactId, version, "compile", "jar", null,
                DefaultArtifactHandler("jar")
            )
        }

        log.debug("Resolving $groupId:$artifactId:$version ...")

        val result: ArtifactResolutionResult = repositorySystem!!.resolve(request)
        resolutionErrorHandler!!.throwErrors(request, result)
        return result.artifacts.map { it.file }
    }

    private val dokkaVersion: String by lazy {
        mavenProject?.pluginArtifacts?.filter { it.groupId == "org.jetbrains.dokka" && it.artifactId == "dokka-maven-plugin" }
            ?.firstOrNull()?.version ?: throw IllegalStateException("Not found dokka plugin")
    }
}

@Mojo(
    name = "dokka",
    defaultPhase = LifecyclePhase.PRE_SITE,
    threadSafe = true,
    requiresDependencyResolution = ResolutionScope.COMPILE,
    requiresProject = true
)
class DokkaMojo : AbstractDokkaMojo(emptyList()) {
    @Parameter(required = true, defaultValue = "\${project.basedir}/target/dokka")
    var outputDir: String = ""

    override fun getOutDir() = outputDir
}

@Mojo(
    name = "javadoc",
    defaultPhase = LifecyclePhase.PRE_SITE,
    threadSafe = true,
    requiresDependencyResolution = ResolutionScope.COMPILE,
    requiresProject = true
)
class DokkaJavadocMojo : AbstractDokkaMojo(listOf(javadocDependency)) {
    @Parameter(required = true, defaultValue = "\${project.basedir}/target/dokkaJavadoc")
    var outputDir: String = ""

    override fun getOutDir() = outputDir
}

@Mojo(
    name = "javadocJar",
    defaultPhase = LifecyclePhase.PRE_SITE,
    threadSafe = true,
    requiresDependencyResolution = ResolutionScope.COMPILE,
    requiresProject = true
)
class DokkaJavadocJarMojo : AbstractDokkaMojo(listOf(javadocDependency)) {
    @Parameter(required = true, defaultValue = "\${project.basedir}/target/dokkaJavadocJar")
    var outputDir: String = ""

    /**
     * Specifies the directory where the generated jar file will be put.
     */
    @Parameter(property = "project.build.directory")
    private var jarOutputDirectory: String? = null

    /**
     * Specifies the filename that will be used for the generated jar file. Please note that `-javadoc`
     * or `-test-javadoc` will be appended to the file name.
     */
    @Parameter(property = "project.build.finalName")
    private var finalName: String? = null

    /**
     * Specifies whether to attach the generated artifact to the project helper.
     */
    @Parameter(property = "attach", defaultValue = "true")
    private val attach: Boolean = false

    /**
     * The archive configuration to use.
     * See [Maven Archiver Reference](https://maven.apache.org/shared/maven-archiver/index.html)
     */
    @Parameter
    private val archive = MavenArchiveConfiguration()

    @Parameter(property = "maven.javadoc.classifier", defaultValue = "javadoc", required = true)
    private var classifier: String? = null

    @Component
    private var projectHelper: MavenProjectHelper? = null

    @Component(role = Archiver::class, hint = "jar")
    private var jarArchiver: JarArchiver? = null

    override fun getOutDir() = outputDir

    override fun execute() {
        super.execute()
        if (!File(outputDir).exists()) {
            log.warn("No javadoc generated so no javadoc jar will be generated")
            return
        }
        val outputFile = generateArchive("$finalName-$classifier.jar")
        if (attach) {
            projectHelper?.attachArtifact(mavenProject, "javadoc", classifier, outputFile)
        }
    }

    private fun generateArchive(jarFileName: String): File {
        val javadocJar = File(jarOutputDirectory, jarFileName)

        val archiver = MavenArchiver()
        archiver.archiver = jarArchiver
        archiver.setOutputFile(javadocJar)
        archiver.archiver.addDirectory(File(outputDir), arrayOf("**/**"), arrayOf())

        archive.isAddMavenDescriptor = false
        archiver.createArchive(session, mavenProject, archive)

        return javadocJar
    }
}

private val javadocDependency = Dependency().apply {
    groupId = "org.jetbrains.dokka"
    artifactId = "javadoc-plugin"
}