DUMMY = false

def doParallelBuilds() {

	def jobnames = []

	// Detect buildable os- jobs in branch folder
	Jenkins.instance.getAllItems(Job.class).each {
		if (it.class == org.jenkinsci.plugins.workflow.job.WorkflowJob && it.isBuildable()) {
			def jobname = it.fullName
			if (0 == jobname.indexOf(env.JOB_DIR + '/os-')) {
				jobnames.add(jobname)
			}
		}
	}

	def builders = [:]

	for (jobname in jobnames) {
		def name = jobname
		builders[name] = {
			stage(name) {
				echo name
				script {
					result = buildJob(name, name)
					if (result == 'FAILURE') {
						error("${name} build failed")
					}
				}
			}
		}
	}

	parallel builders
}

String buildJob(String ghcontext, String jobName) {
	echo "Build of: " + jobName
	if (DUMMY) { jobName = "Branch_Builds/dummy" }
	def jobBuild = build(job: jobName, propagate: false,
		parameters: [
			string(name: 'GITHUB_URL', value: GITHUB_URL),
			string(name: 'GITHUB_BRANCH', value: GITHUB_BRANCH),
			string(name: 'JOB_DIR', value: JOB_DIR),
			string(name: 'SHA1', value: SHA1),
		]
	)
	def result = jobBuild.getResult()
	echo "Build of " + jobName + " returned result: " + result
	if ('FAILURE' == result) { error("${jobName} failed") }
	return result
}

String autestJob(String ghcontext, String jobName, String shard) {
	echo "Autest Build of: " + jobName + " " + shard
	if (DUMMY) { jobName = "Branch_Builds/dummy" }
	def jobBuild = build(job: jobName, propagate: false,
		parameters: [
			string(name: 'GITHUB_URL', value: GITHUB_URL),
			string(name: 'GITHUB_BRANCH', value: GITHUB_BRANCH),
			string(name: 'JOB_DIR', value: JOB_DIR),
			string(name: 'SHA1', value: SHA1),
			string(name: 'AUTEST_SHARD', value: shard),
		]
	)
	def result = jobBuild.getResult()
	echo "Build of " + jobName + " returned result: " + result
	if ('FAILURE' == result) { error("${jobName} failed") }
	return result
}

def shaForBranch(url, branch) {
	sha1 = sh (
		script: "set -- `git ls-remote -h $url refs/heads/$branch`; echo \${1}",
		returnStdout: true
	).trim()
	return sha1
}

pipeline {
	agent none

	stages {
		stage('Initialization') {
			agent { label 'master' }
			steps {
				script {
					if (! env.AUTEST_SHARDS) {
						env.AUTEST_SHARDS = 4
					}
					if (! env.JOB_DIR) {
						def bparts = env.JOB_NAME.split('/')
						bparts = bparts - bparts.last()
						env.JOB_DIR = bparts.join('/')
					}

					if (! env.GITHUB_BRANCH) {
						def bparts = env.JOB_NAME.split('/')
						if (2 != bparts.length) {
							error("Invalid branch name from ${JOB_NAME}")
						}
						env.GITHUB_BRANCH = bparts[0]
					}
					currentBuild.displayName = "#${BUILD_NUMBER} ${GITHUB_BRANCH}"
					if (! env.SHA1) {
						env.SHA1 = shaForBranch(env.GITHUB_URL, env.GITHUB_BRANCH)
					}
					currentBuild.displayName = "#${BUILD_NUMBER} ${GITHUB_BRANCH}"
					currentBuild.description = env.SHA1

					sh 'printenv'

				}
			}
		}

		stage('Validation') {
			parallel {
				stage('In Tree') {
					steps {
						script {
							buildJob('in_tree', env.JOB_DIR + '/in_tree')
						}
					}
				}
				stage('Out Of Tree') {
					steps {
						script {
							buildJob('out_of_tree', env.JOB_DIR + '/out_of_tree')
						}
					}
				}
				stage('RAT') {
					steps {
						script {
							buildJob('rat', env.JOB_DIR + '/rat')
						}
					}
				}
				stage('clang format') {
					steps {
						script {
							buildJob('clang_format', env.JOB_DIR + '/clang_format')
						}
					}
				}
			}
		}

		stage('Snapshot') {
			steps {
				script {
					//buildJob('snapshot', env.JOB_DIR + '/snapshot')
					echo "Skipping snapshot"
				}
			}
		}

		stage('OS Builds') {
			steps {
				script {
				  catchError(buildResult: 'FAILURE', stageResult: 'FAILURE') {
					  doParallelBuilds()
					}
				}
			}
		}

		stage('Verification') {
			parallel {
				stage('clang analyzer') {
					steps {
						script {
							buildJob('clang-analyzer', env.JOB_DIR + '/clang_analyzer')
						}
					}
				}
				stage('autests') {
					steps {
						script {
							if (env.AUTEST_SHARDS) {
								def nshards = env.AUTEST_SHARDS as int
								def jobs = [:]
								for (ind = 0 ; ind < nshards ; ind++) {
									index = ind
									String shard = index + "of" + env.AUTEST_SHARDS
									jobs[shard] = { autestJob('autest', env.JOB_DIR + '/autest', shard) }
								}
								parallel jobs
							} else {
								buildJob('autest', env.JOB_DIR + '/autest')
							}
						}
					}
				}
				stage('docs') {
					steps {
						script {
							buildJob('docs', env.JOB_DIR + '/docs')
						}
					}
				}
				stage('cache_tests') {
					steps {
						script {
							buildJob('cache-tests', env.JOB_DIR + '/cache-tests')
						}
					}
				}
				stage('coverage') {
					steps {
						script {
							buildJob('coverage', env.JOB_DIR + '/coverage')
						}
					}
				}
			}
		}
	}
}