def main(ctx):
  return [
      pipeline('linux-amd64', 'linux', 'amd64'),
      pipeline('linux-arm64', 'linux', 'arm64'),
      pipeline('linux-arm', 'linux', 'arm'),
      pipeline_windows('1809'),
      pipeline_windows('1903'),
      manifest(),
  ]

# defines a pipeline step that builds and publishes a docker
# image to a docker remote registry.
def docker_step(name, os, arch):
    repo = 'drone/%s' % name
    if repo == 'server':
      repo = 'drone/drone'
    return {
        'name': 'publish_%s' % name,
        'image': 'plugins/docker:18',
        'settings': {
            'repo': repo,
            'auto_tag': True,
            'auto_tag_suffix': '%s-%s' % (os, arch),
            'username': { 'from_secret': 'docker_username' },
            'password': { 'from_secret': 'docker_password' },
            'dockerfile': 'docker/Dockerfile.%s.%s.%s' % (name, os, arch),
        },
        'when': {
            'event': [ 'push', 'tag' ],
        },
    }

# defines a pipeline step that executes the Go unit tests.
# this will also download dependencies and cache in /go
def test_step():
    return {
        'name': 'test',
        'image': 'golang:1.12',
        'commands': [
            'go test ./...',
        ],
    }

# defines a pipeline step that executes the Go unit tests.
# this will also download dependencies and cache in /go
def build_step(os, arch):
    return {
        'name': 'build',
        'image': 'golang:1.12',
        'commands': [
            'sh scripts/build.sh',
        ],
        'environment': {
            'GOOS': os,
            'GOARCH': arch,
        },
  }

# defines a pipeline that builds, tests and publishes
# docker images for the Drone agent, server and controller.
def pipeline(name, os, arch):
    return {
        'kind': 'pipeline',
        'type': 'docker',
        'name': 'linux-%s' % arch,
        'platform': {
            'os': 'linux',
            'arch': arch,
        },
        'steps': [
            test_step(),
            build_step(os, arch),
            docker_step('drone', os, arch),
            docker_step('agent', os, arch),
            docker_step('controller', os, arch),
        ],
    }

# defines a pipeline that builds and publishes docker images
# for the Drone agent for the Windows kernel.
def pipeline_windows(version):
  return {
    'kind': 'pipeline',
    'type': 'ssh',
    'name': 'windows-%s-amd64' % version,
    'platform': { 'os': 'windows' },
    'server': {
      'host':     { 'from_secret': 'windows_server_%s' % version },
      'user':     { 'from_secret': 'windows_username' },
      'password': { 'from_secret': 'windows_password' },
    },
    'steps': [
      {
        'name': 'build',
        'environment': {
          'USERNAME': { 'from_secret': 'docker_username' },
          'PASSWORD': { 'from_secret': 'docker_password' },
        },
        # TODO these commands build and publish the latest
        # docker tag regardless of git tag.
        'commands': [
          'powershell.exe scripts/build.ps1',
          'docker login -u $env:USERNAME -p $env:PASSWORD',
          'docker build -f docker/Dockerfile.agent.windows.%s -t drone/agent:windows-%s-amd64 .' % (version, version),
          'docker push drone/agent:windows-%s-amd64' % version,
        ],
      },
    ],
    'trigger': {
      'event': ['push']
    }
  }

# defines a pipeline that updates the docker manifest
# for the architecture-specific images previously published
# to dockerhub.
def manifest():
    return {
        'kind': 'pipeline',
        'type': 'docker',
        'name': 'manifest',
        'steps': [
            manifest_step('server'),
            manifest_step('agent'),
            manifest_step('controller'),
        ],
        'trigger': {
            'event': [ 'push', 'tag' ],
        },
        'depends_on': [
            'linux-amd64',
            'linux-arm64',
            'linux-arm',
            'windows-1903-amd64',
            'windows-1809-amd64',
        ],
    }

# defines a pipeline step that creates and publishes
# a docker manifest to a docker remote registry.
def manifest_step(name):
    return {
        'name': 'publish_%s' % name,
        'image': 'plugins/manifest:1',
        'settings': {
            'auto_tag': True,
            'ignore_missing': True,
            'spec': 'docker/manifest.%s.tmpl' % name,
            'username': { 'from_secret': 'docker_username' },
            'password': { 'from_secret': 'docker_password' },
        },
    }