---
# deploy.yml - Deploy updates to Prezenta Work devices
# Handles pulling latest code and restarting services

- name: Deploy Prezenta Work Updates
  hosts: prezenta_devices
  gather_facts: yes
  serial: 1  # Deploy one device at a time to avoid service interruption
  
  vars:
    app_directory: "/srv/prezenta_work"
    git_branch: "dev"
    restart_service: true
    backup_before_deploy: true
    
  tasks:
    - name: Display deployment information
      debug:
        msg: "Deploying to {{ inventory_hostname }} ({{ ansible_host }})"
    
    # Pre-deployment checks
    - name: Check if app directory exists
      stat:
        path: "{{ app_directory }}"
      register: app_dir_stat
    
    - name: Fail if app directory doesn't exist
      fail:
        msg: "Application directory {{ app_directory }} not found on {{ inventory_hostname }}"
      when: not app_dir_stat.stat.exists
    
    # Backup current code
    - name: Create backup directory
      file:
        path: "{{ app_directory }}/backups"
        state: directory
        mode: '0755'
      when: backup_before_deploy
    
    - name: Backup current code
      shell: |
        cd {{ app_directory }}
        tar -czf backups/backup_{{ ansible_date_time.iso8601_basic_short }}.tar.gz \
          --exclude=.git \
          --exclude=__pycache__ \
          --exclude=data \
          --exclude=Files \
          .
      register: backup_result
      when: backup_before_deploy
    
    - name: Display backup created
      debug:
        msg: "Backup created: {{ backup_result.stdout_lines }}"
      when: backup_before_deploy and backup_result is not skipped
    
    # Pull latest code
    - name: Fetch latest from repository
      shell: |
        cd {{ app_directory }}
        git fetch origin
      register: git_fetch
      changed_when: "'Fetching' in git_fetch.stdout or 'Receiving' in git_fetch.stdout"
    
    - name: Checkout dev branch
      shell: |
        cd {{ app_directory }}
        git checkout {{ git_branch }}
      register: git_checkout
    
    - name: Pull latest changes
      shell: |
        cd {{ app_directory }}
        git pull origin {{ git_branch }}
      register: git_pull
      changed_when: "'Already up to date' not in git_pull.stdout"
    
    - name: Display git pull result
      debug:
        msg: "{{ git_pull.stdout }}"
    
    # Verify deployment
    - name: Check Python syntax
      shell: |
        python3 -m py_compile {{ app_directory }}/app.py
      register: syntax_check
      changed_when: false
      failed_when: syntax_check.rc != 0
    
    - name: Verify all modules compile
      shell: |
        cd {{ app_directory }}
        python3 -m py_compile *.py
      register: module_check
      changed_when: false
    
    - name: Verify configuration
      shell: |
        cd {{ app_directory }}
        python3 -c "import config_settings; print('✓ Configuration OK')"
      register: config_check
      changed_when: false
    
    - name: Display verification results
      debug:
        msg: "{{ config_check.stdout }}"
    
    # Restart application
    - name: Restart Prezenta application
      block:
        - name: Stop Prezenta service
          systemd:
            name: prezenta
            state: stopped
            daemon_reload: yes
          become: yes
          when: restart_service
        
        - name: Wait for service to stop
          pause:
            seconds: 2
        
        - name: Start Prezenta service
          systemd:
            name: prezenta
            state: started
            enabled: yes
          become: yes
          when: restart_service
        
        - name: Verify service is running
          systemd:
            name: prezenta
            state: started
          become: yes
          register: service_status
          until: service_status.status.ActiveState == "active"
          retries: 3
          delay: 5
      rescue:
        - name: Service restart failed, attempting manual restart
          debug:
            msg: "Attempting to restart application manually on {{ inventory_hostname }}"
        
        - name: Kill existing processes
          shell: |
            pkill -f "python3.*app.py" || true
          become: yes
        
        - name: Wait before restart
          pause:
            seconds: 3
        
        - name: Start application in background
          shell: |
            cd {{ app_directory }}
            nohup python3 app.py > data/startup.log 2>&1 &
          become: yes
          become_user: pi
    
    # Post-deployment verification
    - name: Wait for application to start
      pause:
        seconds: 5
    
    - name: Check application status via HTTP
      uri:
        url: "http://{{ ansible_host }}:80/status"
        method: GET
        status_code: [200, 404]
        timeout: 10
      register: app_status
      retries: 3
      delay: 2
      until: app_status.status in [200, 404]
    
    - name: Display application status
      debug:
        msg: "Application on {{ inventory_hostname }} is running"
      when: app_status.status in [200, 404]
    
    # Log deployment
    - name: Record deployment in log
      lineinfile:
        path: "{{ app_directory }}/data/deploy.log"
        line: "[{{ ansible_date_time.iso8601 }}] Deployed {{ git_branch }} from {{ ansible_user }}@monitoring_server"
        create: yes
        state: present
    
    - name: Log deployment summary
      debug:
        msg: |
          Deployment completed for {{ inventory_hostname }}
          Branch: {{ git_branch }}
          Status: SUCCESS
          Last git commit: {{ git_pull.stdout_lines[-1] if git_pull.stdout_lines else 'Unknown' }}

  post_tasks:
    - name: Send deployment notification
      debug:
        msg: "Deployment notification: {{ inventory_hostname }} updated to {{ git_branch }}"