# ============================================================
# Docker Compose Deployment Playbook
# Υποστηρίζει: fresh, update, config, rollback
# Χρήση: -e "deploy_mode=update" -e "app_version=2.0.0"
# ============================================================

- name: Docker Compose Deployment
  hosts: "{{ target | default('all_managed') }}"
  become: true
  gather_facts: true

  vars:
    # ── Deployment mode ───────────────────────
    deploy_mode:  "{{ deploy_mode | default('update') }}"
    # Επιλογές: fresh, update, config, rollback

    # ── App settings ──────────────────────────
    app_name:     mywebapp
    app_version:  "{{ app_version | default('1.0.0') }}"
    app_env:      "{{ app_env     | default('production') }}"
    app_port:     3000

    # ── Paths ─────────────────────────────────
    app_base_dir:   "/opt/{{ app_name }}"
    app_config_dir: "/opt/{{ app_name }}/config"
    app_logs_dir:   "/opt/{{ app_name }}/logs"

    # ── Images ────────────────────────────────
    nginx_image:    nginx:1.25.3-alpine
    postgres_image: postgres:15.4-alpine
    redis_image:    redis:7.2-alpine
    app_image:      "nginx:1.25.3-alpine"    # ← placeholder

    # ── Database ──────────────────────────────
    postgres_db:    "{{ app_name }}_db"
    postgres_user:  "{{ app_name }}_user"
    postgres_port:  5432

    # ── Redis ─────────────────────────────────
    redis_port:    6379
    redis_maxmem:  "128mb"

    # ── Nginx ─────────────────────────────────
    nginx_host_port:   80
    nginx_rate_limit:  true
    monitoring_enabled: false

  pre_tasks:

    # ── Validation ────────────────────────────
    - name: Validate deploy_mode
      ansible.builtin.assert:
        that:
          - deploy_mode in ['fresh', 'update', 'config', 'rollback']
        fail_msg: >
          ❌ Invalid deploy_mode: {{ deploy_mode }}
          Valid options: fresh, update, config, rollback
      tags: always

    - name: Deployment info
      ansible.builtin.debug:
        msg:
          - "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
          - "Docker Compose Deployment"
          - "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
          - "Mode   : {{ deploy_mode | upper }}"
          - "App    : {{ app_name }} v{{ app_version }}"
          - "Env    : {{ app_env }}"
          - "Host   : {{ inventory_hostname }}"
          - "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
      tags: always

    - name: Verify Docker
      ansible.builtin.service_facts:
      tags: always

    - name: Assert Docker running
      ansible.builtin.assert:
        that:
          - ansible_facts.services['docker.service'].state == 'running'
        fail_msg: "❌ Docker is not running!"
      tags: always

  tasks:

    # ════════════════════════════════════════
    # FRESH DEPLOY
    # ════════════════════════════════════════
    - name: Fresh deployment
      ansible.builtin.include_tasks:
        file: "{{ playbook_dir }}/../roles/myapp/tasks/deploy_fresh.yml"
      when: deploy_mode == 'fresh'
      tags: [fresh, deploy]

    # ════════════════════════════════════════
    # UPDATE
    # ════════════════════════════════════════
    - name: Update deployment
      ansible.builtin.include_tasks:
        file: "{{ playbook_dir }}/../roles/myapp/tasks/deploy_update.yml"
      when: deploy_mode == 'update'
      tags: [update, deploy]

    # ════════════════════════════════════════
    # CONFIG UPDATE
    # ════════════════════════════════════════
    - name: Config update
      ansible.builtin.include_tasks:
        file: "{{ playbook_dir }}/../roles/myapp/tasks/deploy_config.yml"
      when: deploy_mode == 'config'
      tags: [config]

    # ════════════════════════════════════════
    # ROLLBACK
    # ════════════════════════════════════════
    - name: Rollback deployment
      ansible.builtin.include_tasks:
        file: "{{ playbook_dir }}/../roles/myapp/tasks/deploy_rollback.yml"
      when: deploy_mode == 'rollback'
      tags: [rollback]

  post_tasks:

    # ── Status report ─────────────────────────
    - name: Get final stack status
      ansible.builtin.command:
        cmd: >
          docker compose
          -f {{ app_base_dir }}/docker-compose.yml
          -p {{ app_name }}
          ps
      register:     final_status
      changed_when: false
      ignore_errors: true
      tags: always

    - name: Final HTTP check
      ansible.builtin.uri:
        url:         "http://localhost/health"
        status_code: 200
      register:      final_http
      ignore_errors: true
      tags: always

    - name: Deployment Summary
      ansible.builtin.debug:
        msg:
          - "╔══════════════════════════════════════╗"
          - "║  DEPLOYMENT SUMMARY                  ║"
          - "╠══════════════════════════════════════╣"
          - "║ Mode   : {{ deploy_mode | upper }}"
          - "║ App    : {{ app_name }} v{{ app_version }}"
          - "║ Host   : {{ inventory_hostname }}"
          - "║ HTTP   : {{ '✅ OK' if not final_http.failed else '❌ FAILED' }}"
          - "╠══════════════════════════════════════╣"
          - "║ Services:                            ║"
          - "{{ final_status.stdout | default('N/A') }}"
          - "╚══════════════════════════════════════╝"
      tags: always