# Design:
# - build stage (e.g. docker build -t mathcomp-dev:$IID_$SLUG_coq-8.7 .)
#   - choice of the OCaml compiler: var OPAM_SWITCH in {base, edge}
#     (Dockerfile containing: "opam switch set $compiler && eval $(opam env)")
#   - master (protected branch) => push on GitLab registry and Docker Hub
#   - other branches (not tags) => push on GitLab registry
#   - GitHub PRs => push on GitLab and report back thanks to @coqbot
# - test stage (image: mathcomp-dev:$IID_$SLUG_coq-8.6)
#   - script template foreach project (custom CONTRIB_URL, script)
#   - jobs foreach project and Coq version (custom COQ_VERSION, CONTRIB_VERSION)
#
# Config for protected branches:
# - set vars HUB_REGISTRY, HUB_REGISTRY_USER, HUB_REGISTRY_IMAGE, HUB_TOKEN
#
# Remark:
# - The name chosen for branches should ideally yield different values
#   of CI_COMMIT_REF_SLUG.
# - But this is not mandatory as image tags start with "${CI_PIPELINE_IID}_".
# cf. doc:
# - CI_COMMIT_REF_NAME: The branch or tag name for which project is built.
# - CI_COMMIT_REF_SLUG: $CI_COMMIT_REF_NAME lowercased, shortened to 63 bytes,
#   and with everything except 0-9 and a-z replaced with -.
#   No leading / trailing -. Use in URLs, host names and domain names.
# - CI_PIPELINE_IID: The unique id of the current pipeline scoped to project.

stages:
  - build
  - test

# set var OPAM_SWITCH (if need be) when using
.opam-build:
  stage: build
  image: docker:latest
  services:
    - docker:dind
  variables:
    IMAGE: "${CI_REGISTRY_IMAGE}:${CI_PIPELINE_IID}_${CI_COMMIT_REF_SLUG}_${CI_JOB_NAME}"
    HUB_IMAGE: "${HUB_REGISTRY_IMAGE}:${CI_JOB_NAME}"
    OPAM_SWITCH: "edge"
  before_script:
    - echo "${CI_JOB_TOKEN}" | docker login -u "${CI_REGISTRY_USER}" --password-stdin "${CI_REGISTRY}"
  script:
    - docker build --pull --build-arg=coq_image="coqorg/${CI_JOB_NAME//-/:}" --build-arg=compiler="${OPAM_SWITCH}" -t "${IMAGE}" .
    - docker push "${IMAGE}"
    - docker logout "${CI_REGISTRY}"
    - |
      if [ -n "${HUB_REGISTRY_IMAGE}" ]; then
        set -e
        echo "${HUB_TOKEN}" | docker login -u "${HUB_REGISTRY_USER}" --password-stdin "${HUB_REGISTRY}"
        docker tag "${IMAGE}" "${HUB_IMAGE}"
        docker push "${HUB_IMAGE}"
        docker logout "${HUB_REGISTRY}"
        set +e
      fi
  except:
    - tags
    - merge_requests

coq-8.7:
  extends: .opam-build

coq-8.8:
  extends: .opam-build

coq-8.9:
  extends: .opam-build

coq-dev:
  extends: .opam-build

# set var OPAM_SWITCH (if need be) and COQ_VERSION when using
.make-build:
  stage: build
  image: docker:latest
  services:
    - docker:dind
  variables:
    # This image will be built locally only (not pushed)
    IMAGE: "mathcomp-dev:make_coq-${COQ_VERSION}"
    OPAM_SWITCH: "edge"
  before_script:
  script:
    - docker build -f Dockerfile.make --pull --build-arg=coq_image="coqorg/coq:${COQ_VERSION}" --build-arg=compiler="${OPAM_SWITCH}" -t "${IMAGE}" .
  except:
    - tags
    - merge_requests

make-coq-latest:
  extends: .make-build
  variables:
    COQ_VERSION: "latest"
  
# set CONTRIB_URL, script, COQ_VERSION, CONTRIB_VERSION when using
.ci:
  stage: test
  image: "${CI_REGISTRY_IMAGE}:${CI_PIPELINE_IID}_${CI_COMMIT_REF_SLUG}_coq-${COQ_VERSION}"
  variables:
    GIT_STRATEGY: none
  before_script:
    - cat /proc/{cpu,mem}info || true
    # don't printenv if there are private tokens
    - opam config list
    - opam repo list
    - opam list
    - coqc --version
    - git clone -b "${CONTRIB_VERSION}" --depth 1 "${CONTRIB_URL}" /home/coq/ci
    - cd /home/coq/ci
    - git rev-parse --verify HEAD
  except:
    - tags
    - merge_requests

# Guidelines to add a library to mathcomp CI:
# - Add a hidden job (starting with a .) .ci-lib that extends the .ci job,
#   sets var CONTRIB_URL (library Git URL), and defines a dedicated script
# - Add 1 job per Coq version to test, that extends the previous hidden job,
#   and sets vars COQ_VERSION, CONTRIB_VERSION (compatible Git branch/tag)

# The Four Color Theorem
.ci-fourcolor:
  extends: .ci
  variables:
    CONTRIB_URL: "https://github.com/math-comp/fourcolor.git"
    CONTRIB_VERSION: master
  script:
    - make -j "${NJOBS}"
    - make install

ci-fourcolor-8.7:
  extends: .ci-fourcolor
  variables:
    COQ_VERSION: "8.7"

ci-fourcolor-8.8:
  extends: .ci-fourcolor
  variables:
    COQ_VERSION: "8.8"

ci-fourcolor-dev:
  extends: .ci-fourcolor
  variables:
    COQ_VERSION: "dev"

# The Odd Order Theorem
.ci-odd-order:
  extends: .ci
  variables:
    CONTRIB_URL: "https://github.com/math-comp/odd-order.git"
    CONTRIB_VERSION: master
  script:
    - make -j "${NJOBS}"
    - make install

ci-odd-order-8.7:
  extends: .ci-odd-order
  variables:
    COQ_VERSION: "8.7"

# The Lemma Overloading library
.ci-lemma-overloading:
  extends: .ci
  variables:
    CONTRIB_URL: "https://github.com/coq-community/lemma-overloading.git"
    CONTRIB_VERSION: master
  script:
    - opam pin add -n -k path coq-lemma-overloading .
    - opam install -y -v -j "${NJOBS}" coq-lemma-overloading

ci-lemma-overloading-8.8:
  extends: .ci-lemma-overloading
  variables:
    COQ_VERSION: "8.8"

ci-lemma-overloading-8.9:
  extends: .ci-lemma-overloading
  variables:
    COQ_VERSION: "8.9"

ci-lemma-overloading-dev:
  extends: .ci-lemma-overloading
  variables:
    COQ_VERSION: "dev"