- name: Firefox (home page and bookmarks of the contest)
  hosts: all
  become: yes
  vars:
    contest_url: https://atlantic-canada26.kattis.com
    contest_id: atlantic-canada26
    policies: /usr/lib/firefox/distribution/policies.json
    # The bookmarks of the ICPC image point to http://contest, which is the
    # contest server of the World Finals. They are replaced by the Kattis pages.
    bookmarks:
      - { Placement: toolbar, Title: "Contest", URL: "{{ contest_url }}/contests/{{ contest_id }}" }
      - { Placement: toolbar, Title: "Problems", URL: "{{ contest_url }}/contests/{{ contest_id }}/problems" }
      - { Placement: toolbar, Title: "Standings", URL: "{{ contest_url }}/contests/{{ contest_id }}/standings" }
      - { Placement: toolbar, Title: "Contest Help (offline)", URL: "file:///usr/share/doc/acpc/help/index.html" }
      - { Placement: toolbar, Title: "Language Documentation", URL: "https://devdocs/" }
      - { Placement: toolbar, Title: "Technical Notes", URL: "file:///usr/share/doc/icpc/TechNotes.pdf" }

  tasks:
    - name: Set the home page and the bookmarks
      shell: |
        python3 - "{{ policies }}" <<'PY'
        import json, sys
        path = sys.argv[1]
        data = json.load(open(path))
        p = data.setdefault("policies", {})
        before = json.dumps(data, sort_keys=True)
        p["Bookmarks"] = json.loads('{{ bookmarks | to_json }}')
        p["Homepage"] = {"Locked": True, "StartPage": "homepage-locked",
                         "URL": "{{ contest_url }}"}
        # No extensions can be installed, and about:config is closed
        p["ExtensionSettings"] = {"*": {"installation_mode": "blocked"}}
        p["BlockAboutConfig"] = True
        if json.dumps(data, sort_keys=True) != before:
            json.dump(data, open(path, "w"), indent=2)
            print("changed")
        PY
      register: ff
      changed_when: "'changed' in ff.stdout"