common.gradle

ext.modifyModVersion = { File file, int delta ->
    def versionPattern = ~/mod\.version\s*=\s*(\d+)\.(\d+)\.(\d+)(-.+)?/
    def content = file.text

    // Detect line ending from the file
    def lineEnding = content.contains('\r\n') ? '\r\n' : '\n'
    def lines = content.split(/\r?\n/)

    def matches = lines.findAll { line -> versionPattern.matcher(line).find() }
    if (matches.size() != 1) {
        throw new GradleException("Expected exactly one mod.version in ${file}, found ${matches.size()}")
    }

    def updatedLines = lines.collect { line ->
        def matcher = versionPattern.matcher(line)
        if (matcher.find()) {
            def major = matcher.group(1).toInteger()
            def minor = matcher.group(2).toInteger()
            def patch = matcher.group(3).toInteger()
            def suffix = matcher.group(4) ?: ''

            def newPatch = patch + delta
            if (newPatch < 0) {
                throw new GradleException("Patch version underflow in ${file}: cannot decrement below zero")
            }

            def newVersion = "${major}.${minor}.${newPatch}${suffix}"
            println "Updated ${file} from ${matcher.group(0)} to mod.version=${newVersion}"
            return line.replaceFirst(versionPattern, "mod.version=${newVersion}")
        } else {
            return line
        }
    }

    file.text = updatedLines.join(lineEnding)
}

tasks.register('incrementModVersions') {
    group = 'publishing'
    description = 'Increments the patch version of mod.version in gradle.properties.'
    doLast {
        def file = rootProject.file('gradle.properties')
        try {
            modifyModVersion(file, 1)
        } catch (Exception e) {
            println "Error processing ${file}: ${e.message}"
            throw e
        }
    }
}

tasks.register('decrementModVersions') {
    group = 'publishing'
    description = 'Decrements the patch version of mod.version in gradle.properties.'
    doLast {
        def file = rootProject.file('gradle.properties')
        try {
            modifyModVersion(file, -1)
        } catch (Exception e) {
            println "Error processing ${file}: ${e.message}"
            throw e
        }
    }
}