---
# Git-based Rollback Playbook
# Rolls back to the previous release by switching the symlink
#
# Usage:
#   ansible-playbook -i inventories/production/hosts.yml playbooks/rollback-git-based.yml
#   ansible-playbook -i inventories/production/hosts.yml playbooks/rollback-git-based.yml --extra-vars "rollback_to=20241025123456"

- name: Rollback Custom PHP Framework (Git-based)
  hosts: web_servers
  become: true

  vars:
    app_name: michaelschiemer
    app_user: deploy
    app_group: deploy
    app_base_path: "/var/www/{{ app_name }}"
    releases_path: "{{ app_base_path }}/releases"
    current_path: "{{ app_base_path }}/current"

  pre_tasks:
    - name: Check if deployment lock exists
      stat:
        path: "{{ app_base_path }}/.deploy.lock"
      register: deploy_lock

    - name: Fail if deployment is in progress
      fail:
        msg: "Cannot rollback - deployment in progress"
      when: deploy_lock.stat.exists

    - name: Create rollback lock
      file:
        path: "{{ app_base_path }}/.rollback.lock"
        state: touch
        owner: "{{ app_user }}"
        group: "{{ app_group }}"

  tasks:
    - name: Get current release
      stat:
        path: "{{ current_path }}"
      register: current_release

    - name: Fail if no current release exists
      fail:
        msg: "No current release found at {{ current_path }}"
      when: not current_release.stat.exists

    - name: Get list of all releases
      find:
        paths: "{{ releases_path }}"
        file_type: directory
      register: all_releases

    - name: Sort releases by creation time (newest first)
      set_fact:
        sorted_releases: "{{ all_releases.files | sort(attribute='ctime', reverse=true) }}"

    - name: Determine target release for rollback
      set_fact:
        target_release: "{{ rollback_to if rollback_to is defined else sorted_releases[1].path }}"

    - name: Verify target release exists
      stat:
        path: "{{ target_release }}"
      register: target_release_stat

    - name: Fail if target release doesn't exist
      fail:
        msg: "Target release not found: {{ target_release }}"
      when: not target_release_stat.stat.exists

    - name: Display rollback information
      debug:
        msg:
          - "Current release: {{ current_release.stat.lnk_source }}"
          - "Rolling back to: {{ target_release }}"

    - name: Switch symlink to previous release
      file:
        src: "{{ target_release }}"
        dest: "{{ current_path }}"
        state: link
        owner: "{{ app_user }}"
        group: "{{ app_group }}"
        force: yes

    - name: Wait for application to be ready
      wait_for:
        timeout: 5
      delegate_to: localhost

    - name: Health check after rollback
      uri:
        url: "http://{{ ansible_host }}/health/summary"
        method: GET
        return_content: yes
        status_code: 200
      register: health_check
      retries: 3
      delay: 5
      until: health_check.status == 200
      ignore_errors: yes

    - name: Log rollback
      lineinfile:
        path: "{{ app_base_path }}/deploy.log"
        line: "[{{ ansible_date_time.iso8601 }}] ROLLBACK: {{ current_release.stat.lnk_source }} -> {{ target_release }} - Health: {{ health_check.status | default('FAILED') }}"
        create: yes

    - name: Display rollback result
      debug:
        msg:
          - "=========================================="
          - "Rollback completed"
          - "Previous: {{ current_release.stat.lnk_source }}"
          - "Current: {{ target_release }}"
          - "Health check: {{ health_check.status | default('FAILED') }}"
          - "=========================================="

  post_tasks:
    - name: Remove rollback lock
      file:
        path: "{{ app_base_path }}/.rollback.lock"
        state: absent

  rescue:
    - name: Remove rollback lock on failure
      file:
        path: "{{ app_base_path }}/.rollback.lock"
        state: absent

    - name: Log rollback failure
      lineinfile:
        path: "{{ app_base_path }}/deploy.log"
        line: "[{{ ansible_date_time.iso8601 }}] ROLLBACK FAILED"
        create: yes

    - name: Fail with error message
      fail:
        msg: "Rollback failed"