// All licenses that we accept, and their aliases
def allowList = [
        [name: 'BSD-2-Clause', url: 'http://opensource.org/licenses/BSD-2-Clause', aliases: [
                [name: 'BSD-style', url: 'http://www.opensource.org/licenses/bsd-license.php'],
                [name: 'BSD', url: 'http://www.opensource.org/licenses/bsd-license.php'],
                [name: 'The BSD License', url: 'http://www.opensource.org/licenses/bsd-license.php'],
                [name: 'BSD 2-Clause License'],
                [name: 'BSD 2-Clause license', url: 'http://opensource.org/licenses/BSD-2-Clause'],
                [name: 'BSD', url: 'http://www.jcraft.com/jzlib/LICENSE.txt'],
                [name: 'Revised BSD', url: 'http://www.jcraft.com/jsch/LICENSE.txt'],
        ]],
        [name: 'BSD-3-Clause', url: 'http://opensource.org/licenses/BSD-3-Clause', aliases: [
                [name: 'BSD-3-Clause', url: 'https://asm.ow2.io/license.html'],
                [name: 'The BSD 3-Clause License'],
                [name: 'The 3-Clause BSD License'],
                [name: '3-Clause BSD License'],
                [name: 'BSD 3-Clause'],
                [name: 'BSD 3 Clause'],
                [name: 'BSD 3-clause'],
                [name: 'BSD 3-Clause License'],
                [name: 'BSD Licence 3'],
                [name: 'BSD License 3'],
                [name: 'New BSD License'],
                [name: 'New BSD license'],
                [name: 'The New BSD License'],
                [name: 'BSD License', url: 'http://www.antlr.org/license.html'],
                [name: 'BSD licence', url: 'http://antlr.org/license.html'],
                [name: 'The BSD License', url: 'http://www.antlr.org/license.html'],
                [name: 'BSD', url: 'http://asm.ow2.org/license.html'],
                [name: 'BSD', url: 'http://www.jcraft.com/jsch/LICENSE.txt'],
                [name: 'BSD', url: 'https://github.com/sbt/test-interface/blob/master/LICENSE'],
                [name: 'BSD', url: 'LICENSE.txt'],
                [name: 'BSD 3-Clause "New" or "Revised" License (BSD-3-Clause)'],
                [name: '', url: 'http://asm.ow2.org/license.html'],
                [name: 'BSD', url: 'http://asm.objectweb.org/license.html'],
        ]],
        [name: 'Apache-2.0', url: 'https://opensource.org/licenses/Apache-2.0', aliases: [
                [name: 'The Apache Software License, Version 2.0'],
                [name: 'The Apache License, Version 2.0'],
                [name: 'The Apache Software License, version 2.0'],
                [name: 'Apache 2'],
                [name: 'Apache v2'],
                [name: 'Apache License, Version 2.0'],
                [name: 'Apache License, Version 2'],
                [name: 'Apache Software License - Version 2.0'],
                [name: 'Apache License 2.0'],
                [name: 'Apache License'],
                [name: 'Apache 2.0'],
                [name: 'Apache-2.0'],
                [name: 'Apache 2.0 License'],
                [name: 'ASL'],
                [name: 'ASL 2.0'],
                [name: 'the Apache License, ASL Version 2.0'],
                [name: 'Apache License V2.0'],
                [name: 'Apache License v2.0'],
                [name: 'Apache License Version 2.0'],
                [name: '', url: 'http://www.apache.org/licenses/LICENSE-2.0.txt'],
        ]],
        [name: 'MIT', url: 'https://opensource.org/licenses/MIT', aliases: [
                [name: 'MIT'],
                [name: 'MIT license'],
                [name: 'MIT License'],
                [name: 'The MIT License'],
                [name: 'Bouncy Castle Licence'],
                [name: 'MIT-0', url: 'https://spdx.org/licenses/MIT-0.html'],
        ]],
        [name: 'Eclipse Distribution License - v 1.0', url: 'https://www.eclipse.org/licenses/edl-v10.html', aliases: [
                [name: 'Eclipse Distribution License - v 1.0', url: 'http://www.eclipse.org/org/documents/edl-v10.php'],
                [name: 'EDL 1.0'],
        ]],
        [name: 'Eclipse Public License - v 1.0', url: 'https://www.eclipse.org/legal/epl-v10.html', aliases: [
                [name: 'Eclipse Public License 1.0'],
                [name: 'EPL', url: 'http://www.eclipse.org/legal/epl-v10.html']
        ]],
        [name: 'Eclipse Public License - v 2.0', url: 'http://www.eclipse.org/legal/epl-2.0.html', aliases: [
                [name: 'Eclipse Public License 2.0'],
                [name: 'Eclipse Public License v2.0', url: 'https://www.eclipse.org/legal/epl-v20.html'],
                [name: 'EPL 2.0', url: 'http://www.eclipse.org/legal/epl-2.0'],
                [name: 'Eclipse Public License - v 2.0', url: 'https://www.eclipse.org/legal/epl-v20.html']
        ]],
        [name: 'GNU General Public License (GPL), version 2, with the Classpath exception', url: 'http://openjdk.java.net/legal/gplv2+ce.html', aliases: [
                [name: 'GPL-2.0'],
                [name: 'GPL'],
                [name: 'GNU General Public License Version 2', url: 'http://www.gnu.org/copyleft/gpl.html']
        ]],
        [name: 'GNU LESSER GENERAL PUBLIC LICENSE, Version 2.1', url: 'https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html'],
        [name: 'Public Domain, per Creative Commons CC0', url: 'http://creativecommons.org/publicdomain/zero/1.0/', aliases: [
                [name: 'CC0'],
                [name: 'Public Domain'],
        ]],
        [name: 'MPL-2.0', url: 'https://www.mozilla.org/MPL/2.0/', aliases: [
                [name: 'Mozilla Public License Version 2.0'],
                [name: 'Mozilla Public License, v. 2.0', url: 'http://mozilla.org/MPL/2.0/'],
        ]],
        [name: 'Common Development and Distribution License Version 1.0', aliases: [
                [name: 'COMMON DEVELOPMENT AND DISTRIBUTION LICENSE (CDDL) Version 1.0']
        ]],
        [name: 'Common Development and Distribution License Version 1.1', aliases: [
                [name: 'CDDL1.1'],
                [name: 'CDDL 1.1'],
                [name: 'Common Development and Distribution License (CDDL), Version 1.1'],
                [name: 'CDDL License', url: 'http://www.opensource.org/licenses/cddl1.php']
        ]],
        [name: 'Common Development and Distribution License Version 1.1 and GNU General Public License, version 2 with the Classpath Exception', aliases: [
                [name: 'CDDL1.1-GPL2/CPE'],
                [name: 'Dual license consisting of the CDDL v1.1 and GPL v2'],
                [name: 'CDDL + GPLv2 with classpath exception'],
        ]],
        [name: 'The Go license', url: 'https://golang.org/LICENSE'],
        [name: 'The OpenLDAP Public License', url: 'http://www.openldap.org/software/release/license.html'],
]

// Dependency license reporting
downloadLicenses {
    dependencyConfiguration = 'runtimeClasspath'
    // Add licenses to some libraries which don't declare their license inside the POM. Should be rechecked if the version is updated.
    licenses = [
                    'javax.servlet.jsp:jsp-api:2.1' : license('Common Development and Distribution License Version 1.1', null),
                    'org.antlr:ST4:4.1' : license('BSD-3-Clause', null),
                    'org.gradle:gradle-tooling-api:6.1.1' : license('Apache-2.0', null),
                    'org.jline:jline:3.22.0' : license('BSD-2-Clause', 'http://opensource.org/licenses/BSD-2-Clause'),
                    'com.sun.codemodel:codemodel:2.6' : license('Common Development and Distribution License Version 1.1', null),
    ]
    aliases = allowList.collectEntries { lic ->
        def actual = license(lic.name, lic.url)
        def alternatives = lic.aliases.collect { it.url ? license(it.name, it.url) : it.name }
        [(actual): alternatives]
    }
}

tasks.downloadLicenses.ext.licenseToDependencyJson = { ->
    def jsonDir = tasks.downloadLicenses.jsonDestination
    def jsonFile = file("$jsonDir/license-dependency.json")
    new groovy.json.JsonSlurper().parseText(jsonFile.text)
}

tasks.downloadLicenses.ext.dependencyToLicenseJson = { ->
    def jsonDir = tasks.downloadLicenses.jsonDestination
    def jsonFile = file("$jsonDir/dependency-license.json")
    new groovy.json.JsonSlurper().parseText(jsonFile.text)
}

// Dependency license validation
tasks.register("validateLicenses") {
    group = 'license'
    description = 'Checks 3rd-party dependency licenses against an allowlist'

    dependsOn tasks.downloadLicenses

    def excludeNeo4jPattern = /^(org|com)\.neo4j.*/
    doLast {
        def allowListedNames = allowList.collect { it.name }
        tasks.downloadLicenses.dependencyToLicenseJson().dependencies
                .findAll { dep -> !dep.name.matches(excludeNeo4jPattern) }
                .findAll { dep -> allowListedNames.intersect(dep.licenses.collect { it.name }).isEmpty() }
                .each { dep -> logger.error("In project ${project.name}: Could not find an allowed license for dependency '$dep.name'. Details: ${dep.toMapString()}") }
                .each { dep -> throw new GradleException("The dependency '$dep.name' has no allowed license") }
    }
}
tasks.check.dependsOn tasks.validateLicenses

tasks.register("generateLicensesFiles") {
    group = 'license'
    description 'Generates a LICENSES and NOTICE file with 3rd-party dependency license information'

    dependsOn tasks.downloadLicenses, tasks.validateLicenses

    def licenseFile = "$tasks.downloadLicenses.jsonDestination/LICENSES.txt"
    def noticesFile = "$tasks.downloadLicenses.jsonDestination/NOTICE.txt"

    ext.licensesFile = file(licenseFile)
    ext.noticeFile = file(noticesFile)
    outputs.file(ext.licensesFile)
    outputs.file(ext.noticeFile)
    doLast {
        // LICENSES.txt
        licensesFile.createNewFile()
        licensesFile.text = rootProject.file("$publicDir/licenses/headers/LICENSES-header.txt").text

        tasks.downloadLicenses.licenseToDependencyJson().licences
                .findAll { lic -> allowList.any { lic.name == it.name }}
                .sort { it.name }.each {
            licensesFile << '\n\n'
            licensesFile << "------------------------------------------------------------------------------\n"
            licensesFile << "$it.name\n"
            it.dependencies.sort { it }.each { licensesFile << "  $it\n" }
            licensesFile << "------------------------------------------------------------------------------\n"
            licensesFile << '\n'
            licensesFile << rootProject.file("$publicDir/licenses/text/$it.name").text
        }

        // NOTICE.txt
        noticeFile.createNewFile()
        noticeFile.text = rootProject.file("$publicDir/licenses/headers/NOTICE-header.txt").text
        noticeFile << '\n\n'
        noticeFile << "Third-party licenses\n"
        noticeFile << "--------------------\n"
        tasks.downloadLicenses.licenseToDependencyJson().licences.sort { it.name }.each {
            noticeFile << '\n'
            noticeFile << "$it.name\n"
            it.dependencies.sort { it }.each { noticeFile << "  $it\n" }
        }

        // Compare this file to what we have stored already, fail if they differ so that the PR fails and we are forced
        // to update it instead!
        File storedLicenseFile = new File("$project.rootDir/LICENSES.txt")
        boolean throwError = false

        if (licensesFile.readLines().size() != storedLicenseFile.readLines().size()) {
            throwError = true
        }

        for (def i = 0; i < licensesFile.readLines().size(); i++) {
            if (throwError) break
            if (licensesFile.readLines().get(i) != storedLicenseFile.readLines().get(i)) {
                throwError = true
            }
        }

        // Copy files to root project so they can be tracked
        copy {
            from licenseFile
            into "$project.rootDir"
        }
        copy {
            from noticesFile
            into "$project.rootDir"
        }

        // Throw after copy task gets run and the file is updated ready for commit :)
        // Note: You might need to do a `./gradlew clean` first if your file isn't updating!
        if (throwError) {
            throw new GradleException("The LICENSES.txt file has updated depenencies, please update by running `./gradlew generateLicensesFiles` and committing the changes.")
        }
    }
}
tasks.check.dependsOn tasks.generateLicensesFiles