import java.nio.charset.StandardCharsets
import java.util.function.Function

import groovy.json.JsonSlurper

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
 * See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
 */
apply from: rootProject.file( 'gradle/module.gradle' )

apply plugin: 'org.hibernate.orm.build.doc-pub'
apply plugin: 'org.hibernate.orm.build.jdks'
apply plugin: 'idea'

idea.module {
}

// skip building this when `build` task is run from root, as many of our CI jobs do
tasks.build.dependsOn.clear()


def stageIntegrationGuideTask = tasks.register( "stageIntegrationGuide", Copy ) {
    group "documentation"
    description "Stages the Integration Guide as part of preparing for release"
    dependsOn ":documentation:renderIntegrationGuides"

    from project.provider { project( ":documentation" ).layout.buildDirectory.dir( "asciidoc/integrationguide" ) }
    into layout.buildDirectory.dir( "documentation/integrationguide" )
}

def stageQuickstartTask = tasks.register( "stageQuickstart", Copy ) {
    group 'documentation'
    description "Stages the Getting Started Guide as part of preparing for release"
    dependsOn ':documentation:renderGettingStartedGuides'

    from project.provider { project( ":documentation" ).layout.buildDirectory.dir( "asciidoc/quickstart" ) }
    into layout.buildDirectory.dir( "documentation/quickstart" )
}

def stageTopicalGuideTask = tasks.register( "stageTopicalGuide", Copy ) {
    group 'documentation'
    description "Stages the Topical Guide as part of preparing for release"
    dependsOn ':documentation:renderTopicalGuides'

    from project.provider { project( ":documentation" ).layout.buildDirectory.dir( "asciidoc/topical" ) }
    into layout.buildDirectory.dir( "documentation/topical" )

}

def stageIntroductionGuideTask = tasks.register( "stageIntroductionGuide", Copy ) {
    group 'documentation'
    description "Stages the Introduction Guide as part of preparing for release"
    dependsOn ':documentation:renderIntroductionGuides'

    from project.provider { project( ":documentation" ).layout.buildDirectory.dir( "asciidoc/introduction" ) }
    into layout.buildDirectory.dir( "documentation/introduction" )
}

def stageQueryGuideTasks = tasks.register( "stageQueryGuide", Copy ) {
    group 'documentation'
    description "Stages the Query Language Guide as part of preparing for release"
    dependsOn ':documentation:renderQueryLanguageGuides'
    description "Stages the Query Language Guide as part of preparing for release"
    dependsOn ':documentation:renderQueryLanguageGuides'

    from project.provider { project( ":documentation" ).layout.buildDirectory.dir( "asciidoc/querylanguage" ) }
    into layout.buildDirectory.dir( "documentation/querylanguage" )
}

def stageUserGuideTask = tasks.register( "stageUserGuide", Copy ) {
    group 'documentation'
    description "Stages the User Guide as part of preparing for release"
    dependsOn ':documentation:renderUserGuides'
    description "Stages the User Guide as part of preparing for release"
    dependsOn ':documentation:renderUserGuides'

    from project.provider { project( ":documentation" ).layout.buildDirectory.dir( "asciidoc/userguide" ) }
    into layout.buildDirectory.dir( "documentation/userguide" )
}


def stageMigrationGuideTask = tasks.register( "stageMigrationGuide", Copy ) {
    group 'documentation'
    description "Stages the Migration Guide as part of preparing for release"
    dependsOn ':documentation:renderMigrationGuide'

    from project.provider { project( ":documentation" ).layout.buildDirectory.dir( "asciidoc/migration-guide" ) }
    into layout.buildDirectory.dir( "documentation/migration-guide" )
}

tasks.named( "publishMigrationGuide" ).configure {
    dependsOn stageMigrationGuide
}

def stageIncubationReportTask = tasks.register( "stageIncubationReport", Copy ) { task ->
    group 'documentation'
    description "Stages ORM @Incubating report"
    dependsOn ':documentation:generateIncubationReport'

    tasks.stageOrmReports.dependsOn task

    from project( ":documentation" ).tasks.generateIncubationReport
    into layout.buildDirectory.dir( "documentation/incubating" )
}

def stageInternalsReportTask = tasks.register( "stageInternalsReport", Copy ) { task ->
    group 'documentation'
    description "Stages the @Internal report"
    dependsOn ':documentation:generateInternalsReport'

    from project( ":documentation" ).tasks.generateInternalsReport
    into layout.buildDirectory.dir( "documentation/internals" )
}

def stageDeprecationReportTask = tasks.register( "stageDeprecationReport", Copy ) {
    group 'documentation'
    description "Stages the @Deprecated/@Remove report"

    dependsOn ':documentation:generateDeprecationReport'

    from project( ":documentation" ).tasks.generateDeprecationReport
    into layout.buildDirectory.dir( "documentation/deprecated" )
}

def stageLoggingReportTask = tasks.register( "stageLoggingReport", Copy ) { task ->
    group 'documentation'
    description "Stages the logging report"

    dependsOn ':documentation:renderLoggingReport'

    from project( ":documentation" ).tasks.renderLoggingReport
    into layout.buildDirectory.dir( "documentation/logging" )
}

def stageDialectReportTask = tasks.register( "stageDialectReport", Copy ) { task ->
    group 'documentation'
    description "Stages the supported Dialects report"
    dependsOn ':documentation:renderDialectReport'

    from project( ":documentation" ).tasks.renderDialectReport
    into "${buildDir}/documentation/dialect"
}

def stageOrmReportsTask = tasks.register( "stageOrmReports" ) {
    group 'documentation'
    description "Stages all ORM reports as part of preparing for release"

    dependsOn ':documentation:generateReports'
    dependsOn stageIncubationReportTask
    dependsOn stageInternalsReportTask
    dependsOn stageDeprecationReportTask
    dependsOn stageLoggingReportTask
    dependsOn stageDialectReportTask
}

def stageJavadocsTask = tasks.register( "stageJavadocs", Copy ) {
    group 'documentation'
    description "Stages the aggregated Javadocs"
    dependsOn ':documentation:javadoc'

    from project( ":documentation" ).tasks.javadoc
    into "${buildDir}/documentation/javadocs"
}

/**
 * Assembles all documentation into the {buildDir}/documentation directory.
 *
 * Depends on building the docs
 */
def assembleDocumentationTask = tasks.register( "assembleDocumentation" ) {
    group 'documentation'
    description 'Assembles all documentation into the {buildDir}/documentation directory'

    dependsOn ':documentation:buildDocsForPublishing'
    dependsOn stageJavadocsTask
    dependsOn stageQuickstartTask
    dependsOn stageIntroductionGuideTask
    dependsOn stageUserGuideTask
    dependsOn stageQueryGuideTasks
    dependsOn stageIntegrationGuideTask
    dependsOn stageTopicalGuideTask
    dependsOn stageMigrationGuideTask
    dependsOn stageOrmReportsTask
}

tasks.named( "uploadDocumentation" ) {
    group = "documentation"
    description = "Uploads assembled documentation to the doc server"
    dependsOn assembleDocumentationTask

    doFirst {
        if ( rootProject.ormVersion.isSnapshot ) {
            logger.error( "Cannot perform upload of SNAPSHOT documentation" );
            throw new RuntimeException( "Cannot perform upload of SNAPSHOT documentation" );
        }
        else {
            logger.lifecycle( "Uploading documentation ..." )
        }
    }

    doLast {
        logger.lifecycle( 'Done uploading documentation' )
    }
}

def releaseChecksTask = tasks.register( "releaseChecks" ) {
    group 'Release'
    description 'Checks and preparation for release'
}

def preVerifyReleaseTask = tasks.register( "preVerifyRelease" ){
    group 'Release'
    description 'Pre-verifies a release job execution (Run locally before a CI release)'

    dependsOn tasks.clean
    dependsOn assembleDocumentationTask
}

def changeLogFileTask = tasks.register( "changeLogFile" ) {
    group 'Release'
    description 'Updates the changelog.txt file based on the change-log report from Jira'
    dependsOn releaseChecksTask

    doFirst {
        logger.lifecycle( "Appending version `${project.releaseVersion}` to changelog..." )
        ChangeLogFile.update( ormVersion.fullName );
    }
}

def changeToReleaseVersionTask = tasks.register( "changeToReleaseVersion" ) {
    group 'Release'
    description 'Updates `gradle/version.properties` file to the specified release-version'

    dependsOn releaseChecksTask

    doFirst {
        logger.lifecycle( "Updating version-file to release-version : `${project.releaseVersion}`" )
        updateVersionFile( project.releaseVersion )
    }
}

def gitPreparationForReleaseTask = tasks.register( 'gitPreparationForRelease' ) {
    dependsOn changeLogFileTask
    dependsOn changeToReleaseVersionTask

    doLast {
        logger.lifecycle( "Performing pre-steps Git commit : `${project.releaseVersion}`" )
        executeGitCommand( 'add', '.' )
        executeGitCommand( 'commit', '-m', "Pre-steps for release : `${project.ormVersion.fullName}`" )
    }
}

def changeToDevelopmentVersionTask = tasks.register( 'changeToDevelopmentVersion' ) {
    group 'Release'
    description 'Updates `gradle/version.properties` file to the specified development-version'

    dependsOn releaseChecksTask

    doFirst {
        logger.lifecycle( "Updating version-file to development-version : `${project.developmentVersion}`" )
        updateVersionFile( project.developmentVersion )
    }
}

def gitTasksAfterReleaseTask = tasks.register( 'gitTasksAfterRelease' ) {
    dependsOn changeToDevelopmentVersionTask

    doLast {
        logger.lifecycle( "Performing pre-steps Git commit : `${project.releaseVersion}`" )
        executeGitCommand( 'add', '.' )
        executeGitCommand( 'commit', '-m', "Post-steps for release : `${project.ormVersion.fullName}`" )

        if ( project.createTag ) {
            logger.lifecycle( "Tagging release : `${project.releaseTag}`..." )
            executeGitCommand( 'tag', '-a', project.releaseTag, '-m', "Release $project.ormVersion.fullName" )
        }
    }
}

void updateVersionFile(String version) {
    logger.lifecycle( "Updating `gradle/version.properties` version to `${version}`" )
    project.ormVersionFile.text = "hibernateVersion=${version}"
}

def publishReleaseArtifactsTask = tasks.register( 'publishReleaseArtifacts' ) {
    dependsOn releaseChecksTask
    mustRunAfter gitPreparationForReleaseTask

    dependsOn uploadDocumentation
    dependsOn uploadDocumentationDescriptor
}

def releaseTask = tasks.register( 'release' ) {
    group 'Release'
    description 'Performs a release on local check-out, including updating changelog and '

    dependsOn gitPreparationForReleaseTask
    dependsOn publishReleaseArtifactsTask

    finalizedBy gitTasksAfterReleaseTask
}

def ciReleaseChecksTask = tasks.register( 'ciReleaseChecks' ) {
    dependsOn releaseChecks
}

def gitTasksAfterCiReleaseTask = tasks.register( 'gitTasksAfterCiRelease' ) {
    dependsOn gitTasksAfterReleaseTask

    doLast {
        if ( project.createTag ) {
            logger.lifecycle( "Pushing branch and tag to remote `${project.gitRemote}`..." )
            executeGitCommand( 'push', '--atomic', project.gitRemote, project.gitBranch, project.releaseTag )
        }
        else {
            logger.lifecycle( "Pushing branch to remote `${project.gitRemote}`..." )
            executeGitCommand( 'push', project.gitRemote, project.gitBranch )
        }
    }
}

def ciReleaseTask = tasks.register( 'ciRelease' ) {
    group 'Release'
    description 'Performs a release: the hibernate version is set and the changelog.txt file updated, the changes are pushed to github, then the release is performed, tagged and the hibernate version is set to the development one.'

    dependsOn ciReleaseChecksTask
    dependsOn releaseTask

    finalizedBy gitTasksAfterCiReleaseTask
}

static String executeGitCommand(Object ... subcommand){
    List<Object> command = ['git']
    Collections.addAll( command, subcommand )
    def proc = command.execute()
    def code = proc.waitFor()
    def stdout = inputStreamToString( proc.getInputStream() )
    def stderr = inputStreamToString( proc.getErrorStream() )
    if ( code != 0 ) {
        throw new GradleException( "An error occurred while executing " + command + "\n\nstdout:\n" + stdout + "\n\nstderr:\n" + stderr )
    }
    return stdout
}

static String inputStreamToString(InputStream inputStream) {
    inputStream.withCloseable { ins ->
        new BufferedInputStream(ins).withCloseable { bis ->
            new ByteArrayOutputStream().withCloseable { buf ->
                int result = bis.read();
                while (result != -1) {
                    buf.write((byte) result);
                    result = bis.read();
                }
                return buf.toString( StandardCharsets.UTF_8.name());
            }
        }
    }
}

class ChangeLogFile {

    // Get the Release Notes from Jira and add them to the Hibernate changelog.txt file
    static void update(String releaseVersion) {
        def text = ""
        File changelog = new File( "changelog.txt" )
        def newReleaseNoteBlock = getNewReleaseNoteBlock(releaseVersion)
        changelog.eachLine {
            line ->
                if ( line.startsWith( "Note:" ) ) {
                    text += line + System.lineSeparator() + System.lineSeparator() + newReleaseNoteBlock
                }
                else {
                    text += line + System.lineSeparator()
                }
        }
        changelog.text = text
    }

    // Get the Release Notes from Jira
    static String getNewReleaseNoteBlock(String releaseVersion) {
        def restReleaseVersion;
        if ( releaseVersion.endsWith( ".Final" ) ) {
            restReleaseVersion = releaseVersion.replace( ".Final", "" )
        }
        else {
            restReleaseVersion = releaseVersion
        }
        def apiString = "https://hibernate.atlassian.net/rest/api/2/search/?jql=project=HHH%20AND%20fixVersion=${restReleaseVersion}%20order%20by%20issuetype%20ASC"
        def apiUrl = new URL( apiString )
        def jsonReleaseNotes = new JsonSlurper().parse( apiUrl )
        def releaseDate = new Date().format( 'MMMM dd, YYYY' )
        def versionId = getVersionId( jsonReleaseNotes, restReleaseVersion )

        ReleaseNote releaseNotes = new ReleaseNote( releaseVersion, releaseDate, versionId )

        def issuetype
        jsonReleaseNotes.issues.each {
            issue ->
                if ( issuetype != issue.fields.issuetype.name ) {
                    issuetype = issue.fields.issuetype.name
                    releaseNotes.addEmptyLine();
                    releaseNotes.addLine( "** ${issue.fields.issuetype.name}" )
                }
                releaseNotes.addLine( "    * [" + issue.key + "] - " + issue.fields.summary )
        }
        releaseNotes.addEmptyLine()
        return releaseNotes.notes
    }

    private static getVersionId(jsonReleaseNotes, String restReleaseVersion) {
        def fixVersions = jsonReleaseNotes.issues.get( 0 ).fields.fixVersions

        for ( def fixVersion : fixVersions ) {
            if ( fixVersion.name.equals( restReleaseVersion ) ) {
                return fixVersion.id
            }
        }
        throw new GradleException( "Unable to determine the version id of the current release." )
    }
}

class ReleaseNote {
    String notes;
    String notesHeaderSeparator = "------------------------------------------------------------------------------------------------------------------------"

    ReleaseNote(String releaseVersion, String releaseDate, String versionId) {
        notes = "Changes in ${releaseVersion} (${releaseDate})" + System.lineSeparator()
        addHeaderSeparator()
        addEmptyLine()
        addLine( "https://hibernate.atlassian.net/projects/HHH/versions/${versionId}" )
    }

    void addLine(String text) {
        notes += text + System.lineSeparator()
    }

    void addHeaderSeparator() {
        addLine( notesHeaderSeparator )
    }

    void addEmptyLine() {
        notes += System.lineSeparator()
    }

    void addEmptyLines(int numberOfLines) {
        for ( i in 1..numberOfLines ) {
            notes += System.lineSeparator()
        }
    }
}


gradle.getTaskGraph().whenReady {tg->

    if ( tg.hasTask( project.tasks.releaseChecks )
            && ! project.getGradle().getStartParameter().isDryRun() ) {
        String releaseVersionLocal
        String developmentVersionLocal

        def console = tg.hasTask( project.tasks.ciReleaseChecks )
                ? null
                : System.console()

        if (project.hasProperty('releaseVersion')) {
            releaseVersionLocal = project.property('releaseVersion')
        }
        else {
            if (console) {
                // prompt for `releaseVersion`
                releaseVersionLocal = console.readLine('> Enter the release version: ')
            }
            else {
                throw new GradleException(
                        "`release`-related tasks require the following properties: 'releaseVersion', 'developmentVersion'"
                )
            }
        }

        if (project.hasProperty('developmentVersion')) {
            developmentVersionLocal = project.property('developmentVersion')
        }
        else {
            if (console) {
                // prompt for `developmentVersion`
                developmentVersionLocal = console.readLine('> Enter the next development version: ')
            }
            else {
                throw new GradleException(
                        "`release`-related tasks require the following properties: 'releaseVersion', 'developmentVersion'"
                )
            }
        }

        assert releaseVersionLocal != null && developmentVersionLocal != null;

        // set up information for the release-related tasks
        project.ext {
            releaseVersion = releaseVersionLocal;
            developmentVersion = developmentVersionLocal;
            createTag = !project.hasProperty('noTag')
            releaseTag = project.createTag ? determineReleaseTag(releaseVersionLocal) : ''
        }

        logger.lifecycle("Checking that the working tree is clean...")
        String uncommittedFiles = executeGitCommand('status', '--porcelain')
        if (!uncommittedFiles.isEmpty()) {
            throw new GradleException(
                    "Cannot release because there are uncommitted or untracked files in the working tree.\n" +
                            "Commit or stash your changes first.\n" +
                            "Uncommitted files:\n    " +
                            uncommittedFiles
            );
        }

        if (tg.hasTask(project.tasks.ciReleaseChecks)) {
            String gitBranchLocal
            String gitRemoteLocal

            if (project.hasProperty('gitBranch')) {
                gitBranchLocal = project.property('gitBranch')
            }
            else {
                gitBranchLocal = executeGitCommand( 'branch', '--show-current' )
            }

            if (project.hasProperty('gitRemote')) {
                gitRemoteLocal = project.property('gitRemote')
            }
            else {
                final String remotes = executeGitCommand( 'remote', 'show' )
                final List<String> tokens = remotes.tokenize()
                if ( tokens.size() != 1 ) {
                    throw new GradleException( "Could not determine `gitRemote` property for `ciRelease` tasks." )
                }
                gitRemoteLocal = tokens.get( 0 )
            }

            project.ext {
                gitBranch = gitBranchLocal
                gitRemote = gitRemoteLocal
            }

            logger.lifecycle("Switching to branch '${project.gitBranch}'...")
            executeGitCommand('checkout', project.gitBranch)

            logger.lifecycle("Checking that all commits are pushed...")
            String diffWithUpstream = executeGitCommand('diff', '@{u}')
            if (!diffWithUpstream.isEmpty()) {
                throw new GradleException(
                        "Cannot perform `ciRelease` tasks because there are un-pushed local commits .\n" +
                                "Push your commits first."
                );
            }
        }
    }
}

static String determineReleaseTag(String releaseVersion) {
    return releaseVersion.endsWith( '.Final' )
            ? releaseVersion.replace( ".Final", "" )
            : releaseVersion;
}