#!/usr/bin/env groovy

/*
Calculate the current version by querying a list of assets in a Nexus Repository.
Return '0.0.1' if there are no matching assets.

Jenkins Plugin dependencies:

- HTTP Request
- Plugin Utilty Steps

*/

// Define the enum
enum BuildNumFlags {

    IS_COMMITS_SINCE_TAG,
    IS_JOB_BUILD_NUMBER,
    IS_FROM_QUERY

}

Map call(Map config = [:]) {
    def defaults = [
        nexusBase: 'https://repo.thejimnicholson.com',
        searchAPI: 'service/rest/v1/search',
        build_flag: BuildNumFlags.IS_FROM_QUERY,
        queryParams: [
           repository: 'tools',
           sort: 'name',
           name: 'tests/test-something*'
        ]
    ]
    Map runConfig = defaults + config

    nexusURL = runConfig.nexusBase + '/' + runConfig.searchAPI
    nexusSearch = buildUrlWithQueryParams(nexusURL, runConfig.queryParams)

    response = httpRequest acceptType: 'APPLICATION_JSON',
      contentType: 'APPLICATION_JSON',
      url: nexusSearch,
      wrapAsMultipart: false
    body = response.content
    assets = readJSON text: body
    latest = assets.items.last()

    version = latest.version
    if (version == 'null') {
        matches = (latest.name =~ /.*-([0-9\.]+)-([0-9]+)\.)[0]/)[0]
        version = matches[1]
        query_build = matches[2]
    }
    switch (build_flag) {
        case BuildNumFlags.IS_COMMITS_SINCE_TAG:
            build = sh(
              script: 'git rev-list $(git tag | tail -1).. --count',
              returnStdout: true
            ).trim()
            break
        case BuildNumFlags.IS_JOB_BUILD_NUMBER:
            build = env.BUILD_NUMBER
            break
        case BuildNumFlags.IS_FROM_QUERY:
            build = query_build
            break
        default:
            build = query_build
            break
    }
    runConfig.nexusQuery = nexusSearch
    runConfig.latestVersion = version
    runConfig.latestBuild = build
    return runConfig
}

/* groovylint-disable-next-line MethodParameterTypeRequired, NoDef */
String buildUrlWithQueryParams(baseUrl, queryParams) {
    url = baseUrl
    if (!queryParams.empty) {
        queryParamsString = queryParams.collect { key, value ->
            "${URLEncoder.encode(key, 'UTF-8')}=${URLEncoder.encode(value, 'UTF-8')}"
        }.join('&')
        url += '?' + queryParamsString
    }
    return url
}