- name: Local documentation (DevDocs) limited to the languages of the contest
  hosts: all
  become: yes
  vars:
    # Documentation sets of the ICPC image: c, cpp, openjdk~25, python~3.11
    # and kotlin~2.4. Kotlin is not a language of this contest.
    contest_docs: [c, cpp, openjdk~25, python~3.11]
    remove_docs: [kotlin~2.4]
    image: localhost/devdocs:latest

  tasks:
    - name: Create the directory for offline contest help
      file:
        path: /usr/share/doc/acpc/help
        state: directory
        owner: root
        group: root
        mode: '0755'

    - name: Install the approved offline help summaries
      copy:
        src: files/help/index.html
        dest: /usr/share/doc/acpc/help/index.html
        owner: root
        group: root
        mode: '0644'

    - name: List the documentation sets of the DevDocs image
      command: podman run --rm --entrypoint ls {{ image }} public/docs
      register: docsets
      changed_when: false

    - name: Check that the contest languages are all there
      assert:
        that: item in docsets.stdout_lines
        fail_msg: "DevDocs has no documentation for {{ item }}"
      loop: "{{ contest_docs }}"

    # DevDocs runs in a container created from the image at every boot, so
    # the change is saved into the image (podman commit)
    - name: Remove the other languages from the DevDocs image
      when: remove_docs | intersect(docsets.stdout_lines) | length > 0
      block:
        - name: Stop the DevDocs service
          systemd:
            name: container-devdocs.service
            state: stopped

        - name: Start a container to change the image
          shell: |
            podman rm -f devdocs-build 2>/dev/null || true
            podman run -d --name devdocs-build {{ image }}

        - name: Remove the documentation sets and set the default list
          shell: |
            podman exec devdocs-build sh -c '
              for slug in {{ remove_docs | join(" ") }}; do rm -rf "public/docs/$slug"; done
              ruby -rjson -e "
                f = %q{public/docs/docs.json}
                data = JSON.parse(File.read(f))
                data.reject! { |d| %w({{ remove_docs | join(" ") }}).include?(d[%q{slug}]) }
                File.write(f, JSON.generate(data))"
              sed -i "s|set :default_docs, %w(.*)|set :default_docs, %w({{ contest_docs | join(" ") }})|" lib/app.rb
              grep -n "set :default_docs" lib/app.rb
              # The compiled assets also hold the list of documentation sets
              cd public/assets
              ruby -rjson -e "
                f = Dir[%q{docs-*.json}].first
                data = JSON.parse(File.read(f))
                data.reject! { |d| %w({{ remove_docs | join(" ") }}).include?(d[%q{slug}]) }
                File.write(f, JSON.pretty_generate(data))
                File.write(Dir[%q{docs-*.js}].reject { |x| x.end_with?(%q{.gz}) }.first, %q{app.DOCS=} + JSON.generate(data) + %q{;})"
              # DevDocs warns when it is not served from devdocs.io (here https://devdocs/)
              sed -i "s|production_host:\"devdocs.io\"|production_host:\"devdocs\"|" application-*.js
              for f in docs-*.json docs-*.js application-*.js; do
                  case "$f" in *.gz) ;; *) gzip -kf "$f" ;; esac
              done
              grep -c kotlin docs-*.js docs-*.json | grep -v ".gz"'


        - name: Save the change into the image
          shell: |
            podman stop devdocs-build
            podman commit devdocs-build {{ image }}
            podman rm -f devdocs-build
            podman image prune -f

        - name: Start the DevDocs service again
          systemd:
            name: container-devdocs.service
            state: started

    - name: Check the documentation sets of the image
      command: podman run --rm --entrypoint ls {{ image }} public/docs
      register: docsets_after
      changed_when: false
      failed_when: docsets_after.stdout_lines | difference(contest_docs + ['docs.json']) | length > 0