---
# Application Rollback Playbook
# Rolls back to a specific image tag using container deployment
---
# Rollback Playbook: setzt IMAGE_TAG zurück und recreatet Services

- name: Rollback Custom PHP Framework Application
  hosts: web_servers
  become: true
  gather_facts: false

  vars:
    app_path: "/var/www/html"
    domain_name: "{{ DOMAIN_NAME | default('michaelschiemer.de') }}"
    rollback_tag: "{{ ROLLBACK_TAG | default('') }}"
    compose_project: "{{ compose_project_name | default(app_path | basename) }}"

  pre_tasks:
    - name: Validate ROLLBACK_TAG is provided
      ansible.builtin.fail:
        msg: "Setze ROLLBACK_TAG auf ein gültiges Image-Tag."
      when: rollback_tag | length == 0

  tasks:
    - name: Ensure environment file exists
      ansible.builtin.stat:
        path: "{{ app_path }}/.env.{{ environment }}"
      register: env_file

    - name: Fail if environment file is missing
      ansible.builtin.fail:
        msg: "Environment-Datei fehlt: {{ app_path }}/.env.{{ environment }}"
      when: not env_file.stat.exists

    - name: Write IMAGE_TAG to env file
      ansible.builtin.lineinfile:
        path: "{{ app_path }}/.env.{{ environment }}"
        regexp: '^IMAGE_TAG='
        line: "IMAGE_TAG={{ rollback_tag }}"
        create: no
        backrefs: false
        mode: "0600"

    - name: Recreate services with rollback tag
      community.docker.docker_compose_v2:
        project_src: "{{ app_path }}"
        files:
          - docker-compose.yml
          - "docker-compose.{{ environment }}.yml"
        env_files:
          - ".env.{{ environment }}"
        pull: false
        build: false
        state: present
        recreate: smart
        remove_orphans: true
        timeout: 300

    - name: Wait for PHP container to be healthy (label-based)
      community.docker.docker_container_info:
        filters:
          label:
            - "com.docker.compose.service=php"
            - "com.docker.compose.project={{ compose_project }}"
      register: php_info
      retries: 20
      delay: 10
      until: php_info.containers is defined and
             (php_info.containers | length) > 0 and
             (
               (php_info.containers[0].State.Health is defined and php_info.containers[0].State.Health.Status == "healthy")
               or
               php_info.containers[0].State.Status == "running"
             )

    - name: Verify application HTTP health
      ansible.builtin.uri:
        url: "https://{{ domain_name }}/health"
        method: GET
        status_code: 200
        timeout: 30
        validate_certs: true
      register: http_health
      retries: 15
      delay: 10
      until: http_health.status == 200

  post_tasks:
    - name: Rollback completed
      ansible.builtin.debug:
        msg:
          - "Rollback erfolgreich"
          - "Neues aktives Image-Tag: {{ rollback_tag }}"
- name: Rollback Custom PHP Framework Application
  hosts: web_servers
  become: true
  gather_facts: true
  
  vars:
    app_path: "/var/www/html"
    rollback_tag: "{{ ROLLBACK_TAG | mandatory }}"
    domain_name: "{{ DOMAIN_NAME | default('michaelschiemer.de') }}"
    environment: "{{ ENV | default('production') }}"
    
  pre_tasks:
    - name: Verify rollback requirements
      assert:
        that:
          - rollback_tag is defined
          - rollback_tag != ''
          - rollback_tag != 'latest'
        fail_msg: "Rollback requires specific ROLLBACK_TAG (not 'latest')"
      tags: always

    - name: Check if target tag exists locally
      community.docker.docker_image_info:
        name: "{{ project_name | default('michaelschiemer') }}:{{ rollback_tag }}"
      register: rollback_image_info
      ignore_errors: true
      tags: always

    - name: Pull rollback image if not available locally
      community.docker.docker_image:
        name: "{{ project_name | default('michaelschiemer') }}:{{ rollback_tag }}"
        source: pull
        force_source: true
      when: rollback_image_info.images | length == 0
      tags: always

    - name: Store current deployment for emergency recovery
      shell: |
        if [ -f {{ app_path }}/.env.{{ environment }} ]; then
          grep '^IMAGE_TAG=' {{ app_path }}/.env.{{ environment }} | cut -d'=' -f2 > {{ app_path }}/.emergency_recovery_tag || echo 'none'
        fi
      tags: backup

  tasks:
    - name: Update environment with rollback tag
      template:
        src: "{{ environment }}.env.template"
        dest: "{{ app_path }}/.env.{{ environment }}"
        owner: deploy
        group: deploy
        mode: '0600'
        backup: true
      vars:
        IMAGE_TAG: "{{ rollback_tag }}"
        DOMAIN_NAME: "{{ domain_name }}"
      no_log: true
      tags: rollback

    - name: Stop current services
      community.docker.docker_compose_v2:
        project_src: "{{ app_path }}"
        files:
          - docker-compose.yml
          - "docker-compose.{{ environment }}.yml"
        env_files:
          - ".env.{{ environment }}"
        state: stopped
        timeout: 120
      tags: rollback

    - name: Deploy rollback version
      community.docker.docker_compose_v2:
        project_src: "{{ app_path }}"
        files:
          - docker-compose.yml
          - "docker-compose.{{ environment }}.yml"
        env_files:
          - ".env.{{ environment }}"
        pull: "never"  # Use local image
        build: "never"
        state: present
        recreate: "always"  # Force recreate for rollback
        timeout: 300
      tags: rollback

    - name: Wait for containers to be healthy after rollback
      community.docker.docker_container_info:
        name: "{{ item }}"
      register: container_info
      retries: 15
      delay: 10
      until: container_info.container.State.Health.Status == "healthy" or container_info.container.State.Status == "running"
      loop:
        - "{{ ansible_hostname }}_php_1"
        - "{{ ansible_hostname }}_web_1"
        - "{{ ansible_hostname }}_db_1"
        - "{{ ansible_hostname }}_redis_1"
      ignore_errors: true
      tags: rollback

    - name: Verify application health after rollback
      uri:
        url: "https://{{ domain_name }}/health"
        method: GET
        status_code: 200
        timeout: 30
        headers:
          User-Agent: "Mozilla/5.0 (Ansible Rollback Check)"
        validate_certs: true
      retries: 10
      delay: 15
      tags: rollback

    - name: Update successful rollback tag
      copy:
        content: "{{ rollback_tag }}"
        dest: "{{ app_path }}/.last_successful_release"
        owner: deploy
        group: deploy
        mode: '0644'
      tags: rollback

  post_tasks:
    - name: Rollback success notification
      debug:
        msg:
          - "Application rollback completed successfully"
          - "Rolled back to: {{ rollback_tag }}"
          - "Environment: {{ environment }}"
          - "Domain: {{ domain_name }}"
          - "Emergency recovery tag stored for further rollback if needed"
      tags: always

    - name: Log rollback event
      lineinfile:
        path: "{{ app_path }}/rollback.log"
        line: "{{ ansible_date_time.iso8601 }} - Rollback to {{ rollback_tag }} from {{ environment }} completed successfully"
        create: true
        owner: deploy
        group: deploy
        mode: '0644'
      tags: always