---
- hosts: server

  vars_files:
    - secrets.yml

  vars:
    - debian_release: buster
    - loki_dir: /srv/loki

  tasks:

    # -------------------------------------------------------------------------
    # Docker CE.
    # -------------------------------------------------------------------------

    - name: Install packages to enable HTTPS repository
      apt:
        name:
          - apt-transport-https
          - ca-certificates
          - curl
          - gnupg2
          - software-properties-common

    - name: Add Docker GPG key
      apt_key:
        id: 0EBFCD88
        url: https://download.docker.com/linux/debian/gpg
        state: present

    - name: Add Docker repository
      apt_repository:
        repo: deb [arch=amd64] https://download.docker.com/linux/debian "{{ debian_release }}" stable
        state: present
      register: docker_repo

    - name: Update apt cache
      apt:
        update_cache: yes
        force_apt_get: yes
      when: docker_repo is changed

    - name: Install docker-ce and docker-compose
      apt:
        name:
          - docker-ce
          - docker-compose

    # -------------------------------------------------------------------------
    # Loki server.
    # -------------------------------------------------------------------------

    - name: Install git
      apt:
        name: git

    - name: Clone Loki repo
      git:
        repo: https://github.com/Wojtek242/loki.git
        dest: "{{ loki_dir }}"
      register: loki_git

    - block:
        - name: Install Loki service
          command: cp "{{ loki_dir }}"/loki-server.service /lib/systemd/system/

        - name: Update service file
          lineinfile:
            path: /lib/systemd/system/loki-server.service
            regexp: '^WorkingDirectory='
            line: 'WorkingDirectory={{ loki_dir }}'

        - name: Reload systemd daemon
          systemd:
            daemon_reload: yes

        - block:
            - name: Update
              command: ./update.sh
              args:
                chdir: "{{ loki_dir }}"

          rescue:
            - debug:
                msg: "Failed to pull containers from registry - will build locally"

            - name: Build locally
              command: make build-all
              args:
                chdir: "{{ loki_dir }}"

      when: loki_git is changed

    # Hosts file must be added after the first update as otherwise the initial
    # container pull will always fail
    - name: Add hosts file
      template:
        src: ./etc/hosts.j2
        dest: /etc/hosts
        mode: 0644

    - name: Ensure service is started
      service:
        name: loki-server
        state: started
        enabled: yes