// *************************
// * This gradle script should be included in the build.gradle by
// * using: apply from: 'replace-newpipe-with-bravenewpipe-strings.gradle'
// *************************
// * It will replace all NewPipe occurrences with BraveNewPipe in any
// * strings.xml file. But some string references we do not want to change.
// * Therefore they are listed in the 'doNotReplaceLinesContaining' array.
// *************************

// begin -- vars and helper function
// array of strings that contain NewPipe but should not be replaced
def doNotReplaceLinesContaining = [
        'name="donation_encouragement"',
        'name="contribution_encouragement"',
        'name="website_encouragement"',
        'name="brave_about_fork"'
]

def shouldWeReplaceStuffInThisLine = { line ->
    for (pattern in doNotReplaceLinesContaining) {
        if (line.contains(pattern)) {
            return false
        }
    }
    return true
}

def cleanupDirBefore = { dir ->
    delete "${dir}"
}

ext.copyStringsXmlFiles = { dir, tmpTargetDir ->
    copy {
        from(dir)
        include '**/strings.xml'
        filteringCharset = 'UTF-8'
        filter {
            line ->
                if (shouldWeReplaceStuffInThisLine(line)) {
                    line
                            .replace('NewPipe', 'BraveNewPipe')
                            .replace('Newpipe', 'BraveNewPipe')
                            .replace('নিউপাইপ', 'সাহসী নিউপাইপ') // bn (bengali)
                            .replace('نیوپایپ', 'لوله جدید شجاع') // fa, czk (farsi)
                } else {
                    line
                }
        }
        into("${tmpTargetDir}")
    }
}

ext.copyNonStringsXmlFiles = { dir, tmpTargetDir ->
    copy {
        from(dir)
        exclude '**/strings.xml'
        into("${tmpTargetDir}")
    }
}

// the return value points to the new srcDir containing the modified files
ext.copyFilesAndReplaceStrings = { dir, tmpTargetDir ->
    println "[BraveNewPipe string replacing] source dir: " + dir
    println "[BraveNewPipe string replacing] target dir: " + tmpTargetDir
    copyStringsXmlFiles(dir, tmpTargetDir)
    copyNonStringsXmlFiles(dir, tmpTargetDir)
    return "${tmpTargetDir}"
}

ext.copyFiles = { dir, tmpTargetDir ->
    copy {
        from(dir)
        into("${tmpTargetDir}")
    }
}

// replace variables content for specific files
ext.alterFilesAndVerify = { targetDir, isTest ->

    if (targetDir.contains('src/main/java') or isTest) { // only look into the 'main' variant
        replaceAndVerify('s', true, targetDir,
                /* filename: */ 'org/schabi/newpipe/error/ErrorActivity.java',
                /* match: */ 'ERROR_EMAIL_ADDRESS = "crashreport@newpipe.schabi.org"',
                /* replace: */ 'ERROR_EMAIL_ADDRESS = "crashreport@gmx.com"',
                /* verify: */ 'crashreport@gmx.com')

        replaceAndVerify('m', false, targetDir,
                /* filename: */ 'org/schabi/newpipe/error/ErrorActivity.java',
                /* match: */ '(public static final String ERROR_GITHUB_ISSUE_URL.*\n[^=]*=)[^;]*',
                /* replace: */ '\\1 "https://github.com/bravenewpipe/NewPipeExtractor/issues"',
                /* verify: */ 'https://github.com/bravenewpipe/NewPipeExtractor/issues')

        replaceAndVerify('s', true, targetDir,
                /* filename: */ 'org/schabi/newpipe/util/ReleaseVersionUtil.kt',
                /* match: */ '"B0:2E:90:7C:1C:D6:FC:57:C3:35:F0:88:D0:8F:50:5F:94:E4:D2:15"',
                /* replace: */ '"C3:96:13:CD:13:92:3F:37:EE:B6:9F:7A:0D:EA:7C:70:E0:7A:73:D8"',
                /* verify: */ '"C3:96:13:CD:13:92:3F:37:EE:B6:9F:7A:0D:EA:7C:70:E0:7A:73:D8"')

        replaceAndVerify('m', false, targetDir,
                /* filename: */ 'org/schabi/newpipe/NewVersionWorker.kt',
                /* match: */ '(private const val NEWPIPE_API_URL =).*',
                /* replace: */ '\\1\n            "https://raw.githubusercontent.com/bravenewpipe/bnp-r-mgr/master/api/data.json"',
                /* verify: */ '"https://raw.githubusercontent.com/bravenewpipe/bnp-r-mgr/master/api/data.json"')
    }

    return "${targetDir}"
}

ext.replaceAndVerify = { flags, byline, dir, fileName, match, replace, verify ->
    assert file(dir + '/' + fileName).exists()

    // check if file is already changed
    def lines2 = new File(dir + '/' + fileName).readLines()
    def result2 = lines2.find { it.contains(verify) }
    if (result2 != null) {
        println "[BraveNewPipe] already changed $match in $fileName"
        // already changed so return
        return
    }

    println "[BraveNewPipe] string replacing in file: " + fileName + ' [What:]' + match
    ant.replaceregexp(
            match:match,
            replace:replace,
            flags:flags,
            byline:byline) {
        fileset(dir: dir, includes: fileName)
    }

    // verify that it really got changed
    def lines = new File(dir + '/' + fileName).readLines()
    def result = lines.find { it.contains(verify) }
    //println result
    assert result != null : "No match for '${match} in ${fileName}"
}
// end -- vars and helper function

// * * * * * * * * * * * *
// Do the actual replacing.
// * * * * * * * * * * * *
// source: https://stackoverflow.com/questions/40843740/replace-word-in-strings-xml-with-gradle-for-a-buildtype/57533688#57533688
// https://michd.me/jottings/gradle-variant.getx-is-obsolete/
android.applicationVariants.all { variant ->
    variant.mergeResourcesProvider.getOrNull()?.doFirst {
        variant.sourceSets.each { sourceSet ->
            sourceSet.res.srcDirs = sourceSet.res.srcDirs.collect { dir ->
                def relDir = relativePath(dir)
                def tmpTargetDir = "${buildDir}/tmp/${variant.dirName}/${relDir}"
                cleanupDirBefore(tmpTargetDir)
                return copyFilesAndReplaceStrings(dir, tmpTargetDir)
            }
        }
    }
}

// only for DEBUGGING of copyFilesAndReplaceStrings() or
// alterFilesAndVerify()
task testReplacingStrings() {
    // -> comment the 'return' statement to actually start debugging
    return

    println "[TESTING BraveNewPipe string replacing]"

    // modify .{xml} files
    def relativeDirFile = 'src/main/res'
    def sourceDir = "${rootDir}/app/${relativeDirFile}/"
    def targetDir = "${buildDir}/tmp/${relativeDirFile}/test_output"
    cleanupDirBefore(targetDir)
    copyFilesAndReplaceStrings(sourceDir, targetDir)
}

ext.replaceNewPipeWithBraveNewPipeStrings = {

    println "[BraveNewPipe string replacing]"

    // modify .{xml} files
    def relativeDirFile = 'src/main/res'
    def sourceDir = "${rootDir}/app/${relativeDirFile}/"
    def targetDir = "${buildDir}/tmp/${relativeDirFile}/test_output"
    copyStringsXmlFiles(sourceDir, targetDir)
    copyFiles(targetDir, sourceDir)
}

task bravify() {
    group = 'brave'
    description = 'replaces string NewPipe with BraveNewPipe'

    doLast {
        replaceNewPipeWithBraveNewPipeStrings()
    }
}

// Patch NewPipe to use BraveNewPipe's:
// - support email address
// - the update json data URL
// - the apk signature
// This task (if enabled) will run on the current code base and
// does this job for you automatically. To be re-run if needed.
// -- evermind --
task testReplaceMailandJsonandSignature() {
    return // enable only when you want it to run

    // modify .{java,kt} files
    def relativeDirFile = 'src/main/java'
    def sourceDir = "${rootDir}/app/${relativeDirFile}/"
    alterFilesAndVerify(sourceDir, true)
}