---
- name: Docker orphan detection
  hosts: all
  become: true
  gather_facts: false

  vars:
    report_root: "/opt/docker-reports"
    report_timestamp: "{{ lookup('pipe', 'date +%Y%m%d-%H%M%S') }}"
    report_file_name: "docker_orphan_detection_<< inventory_hostname >>_<< report_timestamp >>.txt"

  tasks:
    - name: Ensure report root exists
      ansible.builtin.file:
        path: "<< report_root >>"
        state: directory
        mode: "0750"

    - name: List exited containers
      ansible.builtin.command: docker ps -a --filter status=exited --format "{{.Names}}"
      register: orphan_exited_containers
      changed_when: false

    - name: List dead containers
      ansible.builtin.command: docker ps -a --filter status=dead --format "{{.Names}}"
      register: orphan_dead_containers
      changed_when: false

    - name: List dangling images
      ansible.builtin.command: docker images -f dangling=true -q
      register: orphan_dangling_images
      changed_when: false

    - name: List dangling volumes
      ansible.builtin.command: docker volume ls -qf dangling=true
      register: orphan_dangling_volumes
      changed_when: false

    - name: List dangling networks
      ansible.builtin.command: docker network ls -qf dangling=true
      register: orphan_dangling_networks
      changed_when: false

    - name: Build orphan report body
      ansible.builtin.set_fact:
        docker_orphan_report_body: |
          Host: << inventory_hostname >>
          Timestamp: {{ lookup('pipe', 'date -u +%Y-%m-%dT%H:%M:%SZ') }}

          Exited containers (<< orphan_exited_containers.stdout_lines | length >>):
          << (orphan_exited_containers.stdout_lines | default([])) | join('\n') if (orphan_exited_containers.stdout_lines | length > 0) else 'none' >>

          Dead containers (<< orphan_dead_containers.stdout_lines | length >>):
          << (orphan_dead_containers.stdout_lines | default([])) | join('\n') if (orphan_dead_containers.stdout_lines | length > 0) else 'none' >>

          Dangling images (<< orphan_dangling_images.stdout_lines | length >>):
          << (orphan_dangling_images.stdout_lines | default([])) | join('\n') if (orphan_dangling_images.stdout_lines | length > 0) else 'none' >>

          Dangling volumes (<< orphan_dangling_volumes.stdout_lines | length >>):
          << (orphan_dangling_volumes.stdout_lines | default([])) | join('\n') if (orphan_dangling_volumes.stdout_lines | length > 0) else 'none' >>

          Dangling networks (<< orphan_dangling_networks.stdout_lines | length >>):
          << (orphan_dangling_networks.stdout_lines | default([])) | join('\n') if (orphan_dangling_networks.stdout_lines | length > 0) else 'none' >>

    - name: Save local orphan detection report
      ansible.builtin.copy:
        dest: "<< report_root >>/<< report_file_name >>"
        content: "<< docker_orphan_report_body >>"
        mode: "0640"

    - name: Build Discord report content
      ansible.builtin.set_fact:
        discord_orphan_report_content: |
          << discord_message_prefix | default('Docker Orphan Detection Report') >>
          ```text
          << docker_orphan_report_body | truncate(1700, true, '...') >>
          ```
      when:
        - discord_enabled | default(false)
        - (discord_webhook_url | default('')) | length > 0

    - name: Send orphan report to Discord webhook
      ansible.builtin.uri:
        url: "<< discord_webhook_url | default('') >>"
        method: POST
        body_format: json
        body:
          username: "<< discord_username | default('Docker Reporter') >>"
          content: "<< discord_orphan_report_content >>"
        status_code: 204
      when:
        - discord_enabled | default(false)
        - (discord_webhook_url | default('')) | length > 0