---
- name: Rollback Traefik
  hosts: traefik_servers
  become: yes
  vars:
    current_color_file: "/tmp/traefik_current_color"

  tasks:
    - name: Read current color
      slurp:
        src: "{{ current_color_file }}"
      register: current_color_raw
      ignore_errors: yes

    - name: Set rollback color
      set_fact:
        current_color: "{{ current_color_raw.content | b64decode | trim if current_color_raw.content is defined else 'blue' }}"
        rollback_color: "{{ 'green' if (current_color_raw.content | b64decode | trim if current_color_raw.content is defined else 'blue') == 'blue' else 'blue' }}"

    - name: Stop current
      systemd:
        name: "traefik-{{ current_color }}"
        state: stopped

    - name: Start previous
      systemd:
        name: "traefik-{{ rollback_color }}"
        state: started
        enabled: yes

    - name: Update marker
      copy:
        content: "{{ rollback_color }}"
        dest: "{{ current_color_file }}"

    - name: Wait for health
      uri:
        url: "http://localhost:8080/ping"
        status_code: 200
      register: result
      until: result.status == 200
      retries: 10
      delay: 2