# extravars: apps_dir, caddy_image, local_certs
#
# Docker из репозитория Docker, логи контейнеров с ротацией, автоматические обновления безопасности, папка приложений,
# сеть web и ingress: приложение caddy, которое публикует 80 и 443. Caddy подключает блоки приложений
# из data/caddy/sites/ и сам выпускает сертификаты для их доменов. local_certs - сертификаты своего CA Caddy.
# Фаервол настраивается первым: nftables при старте стирает все правила, Docker ставит свои поверх.
- name: Install Docker platform
  hosts: target
  gather_facts: true
  vars:
    caddy_dir: "{{ apps_dir }}/caddy"
  tasks:
    - ansible.builtin.import_tasks: tasks/firewall.yml
      vars:
        firewall_tcp_ports: [ "{{ ansible_port }}", 80, 443 ]
        firewall_udp_ports: [ 443 ]
        # трафик контейнеров идет через forward: его фильтрует Docker
        firewall_forward: true

    - name: Install prerequisites
      ansible.builtin.apt:
        name: [ ca-certificates, curl, python3, unattended-upgrades ]
        state: present
        update_cache: true

    - name: Enable automatic security updates
      ansible.builtin.copy:
        dest: /etc/apt/apt.conf.d/20auto-upgrades
        mode: "0644"
        content: |
          APT::Periodic::Update-Package-Lists "1";
          APT::Periodic::Unattended-Upgrade "1";

    - name: Create keyrings directory
      ansible.builtin.file:
        path: /etc/apt/keyrings
        state: directory
        mode: "0755"

    - name: Download Docker key
      ansible.builtin.get_url:
        url: https://download.docker.com/linux/debian/gpg
        dest: /etc/apt/keyrings/docker.asc
        mode: "0644"

    - name: Add Docker repository
      ansible.builtin.copy:
        dest: /etc/apt/sources.list.d/docker.sources
        mode: "0644"
        content: |
          Types: deb
          URIs: https://download.docker.com/linux/debian
          Suites: {{ ansible_facts.distribution_release }}
          Components: stable
          Architectures: {{ 'arm64' if ansible_facts.architecture == 'aarch64' else 'amd64' }}
          Signed-By: /etc/apt/keyrings/docker.asc

    - name: Create Docker config directory
      ansible.builtin.file:
        path: /etc/docker
        state: directory
        mode: "0755"

    - name: Configure Docker daemon
      ansible.builtin.copy:
        dest: /etc/docker/daemon.json
        mode: "0644"
        content: |
          {
            "log-driver": "local",
            "log-opts": {"max-size": "10m", "max-file": "3"}
          }
      register: docker_daemon

    - name: Install Docker
      ansible.builtin.apt:
        name: [ docker-ce, docker-ce-cli, containerd.io, docker-buildx-plugin, docker-compose-plugin ]
        state: present
        update_cache: true

    # после частых перезапусков (фаервол, release) systemd может держать Docker остановленным по лимиту запусков
    - name: Reset Docker start limit
      ansible.builtin.command: systemctl reset-failed docker.service
      changed_when: false
      failed_when: false

    - name: Start Docker
      ansible.builtin.systemd_service:
        name: docker
        enabled: true
        state: "{{ 'restarted' if docker_daemon.changed else 'started' }}"

    - name: Create apps directory
      ansible.builtin.file:
        path: "{{ apps_dir }}"
        state: directory
        mode: "0700"

    - name: Create web network
      ansible.builtin.shell: docker network inspect web >/dev/null 2>&1 || { docker network create web && echo created; }
      register: web_network
      changed_when: "'created' in web_network.stdout"

    - name: Create ingress directories
      ansible.builtin.file:
        path: "{{ caddy_dir }}/data/caddy/sites"
        state: directory
        mode: "0700"

    - name: Write ingress compose file
      ansible.builtin.template:
        src: templates/caddy-compose.yaml.j2
        dest: "{{ caddy_dir }}/docker-compose.yaml"
        mode: "0600"

    # Caddyfile смонтирован папкой: файл, замененный целиком, контейнер увидел бы только после пересоздания
    - name: Write Caddyfile
      ansible.builtin.template:
        src: templates/Caddyfile.j2
        dest: "{{ caddy_dir }}/data/caddy/Caddyfile"
        mode: "0644"
      register: caddyfile

    - name: Start ingress
      ansible.builtin.command: docker compose up -d --remove-orphans
      args:
        chdir: "{{ caddy_dir }}"
      register: caddy_up
      changed_when: "'Started' in caddy_up.stderr or 'Recreated' in caddy_up.stderr"

    - name: Reload Caddyfile
      ansible.builtin.command: docker compose exec -T caddy caddy reload --config /etc/caddy/Caddyfile --adapter caddyfile
      args:
        chdir: "{{ caddy_dir }}"
      when: caddyfile.changed and not caddy_up.changed