import java.util.regex.Matcher

// Basic port of https://forge.cadoles.com/Cadoles/cpkg
def call(Map params = [:]) {
    def currentRef = sh(script: 'git rev-parse HEAD', returnStdout: true).trim()
    def distRepo = params.distRepo ? params.distRepo : 'dev'
    def dist = params.dist ? params.dist : 'eole'
    def distVersion = params.distVersion ? params.distVersion : '2.7.0'
    def distBranchName = params.distBranchName ? params.distBranchName : env.GIT_BRANCH
    def gitCredentials = params.gitCredentials ? params.gitCredentials : null
    def gitCredentialsType = params.gitCredentialsType ? params.gitCredentialsType : 'http'
    def gitEmail = params.gitEmail ? params.gitEmail : 'jenkins@cadoles.com'
    def gitUsername = params.gitUsername ? params.gitUsername : 'Jenkins'
    def skipCi = params.containsKey('skipCi') ? params.skipCi : false
    def skipPush = params.containsKey('skipPush') ? params.skipPush : true

    // Define dist branch based on provided informations and base branch name
    def distBranch = "dist/${dist}/${distVersion}/${distBranchName}"

    def result = [:]
    result['distBranch'] = distBranch
    result['distVersion'] = distVersion
    result['distRepo'] = distRepo
    result['distBranchName'] = distBranchName

    def proc = {
        // Add distBranch to fetched refs
        sh("git config --add remote.origin.fetch +refs/heads/${distBranch}:refs/remotes/origin/${distBranch}")

        // Update branches
        sh('git fetch --all')

        // Merge currentRef into distBranch and push
        sh("git checkout -b '${distBranch}' 'origin/${distBranch}'")

        // Add git username/email
        sh("git config user.email '${gitEmail}'")
        sh("git config user.username '${gitUsername}'")

        sh("git merge ${currentRef}")

        if (!skipPush) {
            sh('git push')
        } else {
            println("Skipping push. Set skipPush param to 'true' to enable remote repository update.")
        }

        // Retrieve last tag matching pattern pkg/${distRepo}/${dist}-${distVersion}/*
        def lastTag = sh(
            script: "git tag -l 'pkg/${distRepo}/${dist}-${distVersion}/*' --sort=v:refname | tail -n 1",
            returnStdout: true,
        )

        result['previousTag'] = lastTag.trim()

        println("Last tag is '${result['previousTag']}'")

        // Extract version number from last tag
        def lastVersionNumber = lastTag.split('/').last().trim()
        result['previousVersionNumber'] = lastVersionNumber

        println("Last version number is '${lastVersionNumber}'")

        String versionRoot = extractVersionRoot(lastVersionNumber)
        String versionNumber = ''

        if (versionRoot) {
            versionNumber = versionRoot
        } else {
            versionNumber = sh(
                script: "git describe --always ${currentRef}",
                returnStdout: true,
            ).split('/').last().trim()

            Boolean isCommitRef = !versionNumber.matches(/^[0-9]+\.[0-9]+\.[0-9]+.*$/)

            if (isCommitRef) {
                versionNumber = "0.0.0-${versionNumber}"
            }
        }

        versionNumber = "${versionNumber}-${env.BUILD_NUMBER}"

        println("New version number will be '${versionNumber}'")
        result['newVersionNumber'] = versionNumber

        // Generate tag with incremented version number
        def tag = "pkg/${distRepo}/${dist}-${distVersion}/${versionNumber}"

        result['newTag'] = tag

        def tagComment = "Build ${versionNumber} ${distRepo} package for ${dist}-${distVersion}."
        if (skipCi) {
            tagComment += ' [ci skip]'
        }

        sh("git tag -f -a '${tag}' -m '${tagComment}'")

        // Push tag
        if (!skipPush) {
            sh('git push --tags -f')
        } else {
            println("Skipping push. Set skipPush param to 'true' to enable remote repository update.")
        }

        // Switch back to previous ref
        sh("git checkout ${currentRef}")
    }

    if (gitCredentials != null) {
        if (gitCredentialsType == 'http') {
            git.withHTTPCredentials(gitCredentials) {
                proc.call()
            }
        } else if (gitCredentialsType == 'ssh') {
            git.withSSHCredentials(gitCredentials) {
                proc.call()
            }
        } else {
            throw new Exception("Unknown git credentials type '${gitCredentialsType}' ! Expected 'ssh' or 'http' (default).")
        }
    } else {
        proc.call()
    }

    return result
}

@NonCPS
String extractVersionRoot(String fullVersion) {
    Matcher fullVersionMatcher = fullVersion =~ /^([0-9]+\.[0-9]+\.[0-9]+).*$/
    
    if (!fullVersionMatcher.matches()) {
        return ""
    }

    return fullVersionMatcher.group(1)
}