---
# Nextcloud Major Version Upgrade Playbook (Fixed Version)
# Created: 2026-01-23
# Purpose: Safely upgrade Nextcloud from v30 to v32 via v31 (staged upgrade)
#
# Usage:
#   cd ansible/
#   HCLOUD_TOKEN="..." ansible-playbook -i hcloud.yml \
#     playbooks/260123-upgrade-nextcloud-v2.yml --limit <server> \
#     --private-key "../keys/ssh/<server>"
#
# Requirements:
#   - HCLOUD_TOKEN environment variable set
#   - SSH access to target server
#   - Sufficient disk space for backups
#
# Improvements over v1:
#   - Idempotent: can be re-run safely after failures
#   - Better version state tracking (reads actual running version)
#   - Proper maintenance mode handling
#   - Stage skipping if already on target version
#   - Better error messages and rollback instructions

- name: Upgrade Nextcloud from v30 to v32 (staged)
  hosts: all
  become: true
  gather_facts: true

  vars:
    nextcloud_base_dir: "/opt/nextcloud"
    backup_dir: "/root/nextcloud-backup-{{ ansible_date_time.iso8601_basic_short }}"
    target_version: "32"

  tasks:
    # ============================================================
    # PRE-UPGRADE CHECKS
    # ============================================================

    - name: Display upgrade plan
      debug:
        msg: |
          ============================================================
          Nextcloud Upgrade Plan - {{ inventory_hostname }}
          ============================================================

          Target: Nextcloud v{{ target_version }}
          Backup: {{ backup_dir }}

          This playbook will:
          1. Detect current version
          2. Create backup if needed
          3. Upgrade through required stages (v30→v31→v32)
          4. Skip stages already completed
          5. Re-enable apps and disable maintenance mode

          Estimated time: 10-20 minutes
          ============================================================

    - name: Check if Nextcloud is installed
      shell: docker ps --filter "name=^nextcloud$" --format "{{ '{{' }}.Names{{ '}}' }}"
      register: nextcloud_running
      changed_when: false
      failed_when: false

    - name: Fail if Nextcloud is not running
      fail:
        msg: "Nextcloud container is not running on {{ inventory_hostname }}"
      when: "'nextcloud' not in nextcloud_running.stdout"

    - name: Get current Nextcloud version
      shell: docker exec -u www-data nextcloud php occ status --output=json
      register: nextcloud_status
      changed_when: false
      failed_when: false

    - name: Parse Nextcloud status
      set_fact:
        nc_status: "{{ nextcloud_status.stdout | from_json }}"
      when: nextcloud_status.rc == 0

    - name: Handle Nextcloud in maintenance mode
      block:
        - name: Display maintenance mode warning
          debug:
            msg: "⚠ Nextcloud is in maintenance mode. Attempting to disable it..."

        - name: Disable maintenance mode if enabled
          shell: docker exec -u www-data nextcloud php occ maintenance:mode --off
          register: maint_off
          changed_when: "'disabled' in maint_off.stdout"

        - name: Wait a moment for mode change
          pause:
            seconds: 2

        - name: Re-check status after disabling maintenance mode
          shell: docker exec -u www-data nextcloud php occ status --output=json
          register: nextcloud_status_retry
          changed_when: false

        - name: Update status
          set_fact:
            nc_status: "{{ nextcloud_status_retry.stdout | from_json }}"
      when: nextcloud_status.rc != 0 or (nc_status is defined and nc_status.maintenance | bool)

    - name: Display current version
      debug:
        msg: |
          Current: v{{ nc_status.versionstring }}
          Target: v{{ target_version }}
          Maintenance mode: {{ nc_status.maintenance }}

    - name: Check if already on target version
      debug:
        msg: "✓ Nextcloud is already on v{{ nc_status.versionstring }} - nothing to do"
      when: nc_status.versionstring is version(target_version, '>=')

    - name: End play if already upgraded
      meta: end_host
      when: nc_status.versionstring is version(target_version, '>=')

    - name: Check disk space
      shell: df -BG {{ nextcloud_base_dir }} | tail -1 | awk '{print $4}' | sed 's/G//'
      register: disk_space_gb
      changed_when: false

    - name: Verify sufficient disk space
      fail:
        msg: "Insufficient disk space: {{ disk_space_gb.stdout }}GB available, need at least 5GB"
      when: disk_space_gb.stdout | int < 5

    - name: Display available disk space
      debug:
        msg: "Available disk space: {{ disk_space_gb.stdout }}GB"

    # ============================================================
    # BACKUP PHASE (only if not already backed up)
    # ============================================================

    - name: Check if backup already exists
      stat:
        path: "{{ backup_dir }}"
      register: backup_exists

    - name: Skip backup if already exists
      debug:
        msg: "✓ Backup already exists at {{ backup_dir }} - skipping backup phase"
      when: backup_exists.stat.exists

    - name: Create backup
      block:
        - name: Create backup directory
          file:
            path: "{{ backup_dir }}"
            state: directory
            mode: '0700'

        - name: Enable maintenance mode for backup
          shell: docker exec -u www-data nextcloud php occ maintenance:mode --on
          register: maintenance_on
          changed_when: "'enabled' in maintenance_on.stdout"

        - name: Backup Nextcloud database
          shell: |
            docker exec nextcloud-db pg_dump -U nextcloud nextcloud | gzip > {{ backup_dir }}/database.sql.gz
          args:
            creates: "{{ backup_dir }}/database.sql.gz"

        - name: Get database backup size
          stat:
            path: "{{ backup_dir }}/database.sql.gz"
          register: db_backup

        - name: Display database backup info
          debug:
            msg: "Database backup: {{ (db_backup.stat.size / 1024 / 1024) | round(2) }} MB"

        - name: Stop Nextcloud containers for volume backup
          community.docker.docker_compose_v2:
            project_src: "{{ nextcloud_base_dir }}"
            state: stopped

        - name: Backup Nextcloud app volume
          shell: |
            tar -czf {{ backup_dir }}/nextcloud-app-volume.tar.gz -C /var/lib/docker/volumes/nextcloud-app/_data .
          args:
            creates: "{{ backup_dir }}/nextcloud-app-volume.tar.gz"

        - name: Backup Nextcloud database volume
          shell: |
            tar -czf {{ backup_dir }}/nextcloud-db-volume.tar.gz -C /var/lib/docker/volumes/nextcloud-db-data/_data .
          args:
            creates: "{{ backup_dir }}/nextcloud-db-volume.tar.gz"

        - name: Copy current docker-compose.yml to backup
          copy:
            src: "{{ nextcloud_base_dir }}/docker-compose.yml"
            dest: "{{ backup_dir }}/docker-compose.yml.backup"
            remote_src: true

        - name: Display backup summary
          debug:
            msg: |
              ============================================================
              ✓ Backup completed: {{ backup_dir }}
              ============================================================

              To restore from backup if needed:
              1. cd {{ nextcloud_base_dir }} && docker compose down
              2. tar -xzf {{ backup_dir }}/nextcloud-app-volume.tar.gz -C /var/lib/docker/volumes/nextcloud-app/_data
              3. tar -xzf {{ backup_dir }}/nextcloud-db-volume.tar.gz -C /var/lib/docker/volumes/nextcloud-db-data/_data
              4. cp {{ backup_dir }}/docker-compose.yml.backup {{ nextcloud_base_dir }}/docker-compose.yml
              5. cd {{ nextcloud_base_dir }} && docker compose up -d
              ============================================================

        - name: Restart containers after backup
          community.docker.docker_compose_v2:
            project_src: "{{ nextcloud_base_dir }}"
            state: present

        - name: Wait for Nextcloud to be ready
          shell: |
            for i in {1..24}; do
              if docker exec nextcloud curl -f http://localhost:80/status.php 2>/dev/null; then
                exit 0
              fi
              sleep 5
            done
            exit 1
          register: nextcloud_ready
          changed_when: false

        - name: Disable maintenance mode after backup
          shell: docker exec -u www-data nextcloud php occ maintenance:mode --off
          register: maint_off_backup
          changed_when: "'disabled' in maint_off_backup.stdout"

      when: not backup_exists.stat.exists

    # ============================================================
    # DETERMINE UPGRADE PATH
    # ============================================================

    - name: Get current version for upgrade planning
      shell: docker exec -u www-data nextcloud php occ status --output=json
      register: current_version_check
      changed_when: false

    - name: Parse current version
      set_fact:
        current_version: "{{ (current_version_check.stdout | from_json).versionstring }}"

    - name: Determine required upgrade stages
      set_fact:
        required_stages: "{{ [] }}"

    - name: Add v30→v31 stage if needed
      set_fact:
        required_stages: "{{ required_stages + [{'from': '30', 'to': '31', 'stage': 1}] }}"
      when: current_version is version('30', '>=') and current_version is version('31', '<')

    - name: Add v31→v32 stage if needed
      set_fact:
        required_stages: "{{ required_stages + [{'from': '31', 'to': '32', 'stage': 2}] }}"
      when: current_version is version('31', '>=') and current_version is version('32', '<')

    - name: Display upgrade stages
      debug:
        msg: |
          Current version: v{{ current_version }}
          Required stages: {{ required_stages | length }}
          {% if required_stages | length > 0 %}
          Will upgrade: {% for stage in required_stages %}v{{ stage.from }}→v{{ stage.to }}{{ ' ' if not loop.last else '' }}{% endfor %}
          {% else %}
          No upgrade stages needed
          {% endif %}

    - name: Skip upgrade if no stages needed
      meta: end_host
      when: required_stages | length == 0

    # ============================================================
    # STAGED UPGRADE LOOP
    # ============================================================

    - name: Perform staged upgrades
      include_tasks: "{{ playbook_dir }}/260123-upgrade-nextcloud-stage-v2.yml"
      loop: "{{ required_stages }}"
      loop_control:
        loop_var: stage

    # ============================================================
    # POST-UPGRADE
    # ============================================================

    - name: Get final version
      shell: docker exec -u www-data nextcloud php occ status --output=json
      register: final_status
      changed_when: false

    - name: Parse final version
      set_fact:
        final_version: "{{ (final_status.stdout | from_json).versionstring }}"

    - name: Verify upgrade to target version
      fail:
        msg: "Upgrade incomplete - on v{{ final_version }}, expected v{{ target_version }}.x"
      when: final_version is version(target_version, '<')

    - name: Run database optimizations
      shell: docker exec -u www-data nextcloud php occ db:add-missing-indices
      register: db_indices
      changed_when: false
      failed_when: false

    - name: Run bigint conversion
      shell: docker exec -u www-data nextcloud php occ db:convert-filecache-bigint --no-interaction
      register: db_bigint
      changed_when: false
      failed_when: false
      timeout: 600

    - name: Re-enable critical apps
      shell: |
        docker exec -u www-data nextcloud php occ app:enable user_oidc || true
        docker exec -u www-data nextcloud php occ app:enable richdocuments || true
      register: apps_enabled
      changed_when: false

    - name: Ensure maintenance mode is disabled
      shell: docker exec -u www-data nextcloud php occ maintenance:mode --off
      register: final_maint_off
      changed_when: "'disabled' in final_maint_off.stdout"
      failed_when: false

    - name: Update docker-compose.yml to use latest tag
      replace:
        path: "{{ nextcloud_base_dir }}/docker-compose.yml"
        regexp: 'image:\s*nextcloud:\d+'
        replace: 'image: nextcloud:latest'

    - name: Display success message
      debug:
        msg: |
          ============================================================
          ✓ UPGRADE SUCCESSFUL!
          ============================================================

          Server: {{ inventory_hostname }}
          From: v30.x
          To: v{{ final_version }}

          Backup: {{ backup_dir }}

          Next steps:
          1. Test login: https://nextcloud.{{ client_domain }}
          2. Test OIDC: Click "Login with Authentik"
          3. Test file operations
          4. Test Collabora Office

          If all tests pass, remove backup:
            rm -rf {{ backup_dir }}

          docker-compose.yml now uses 'nextcloud:latest' tag
          ============================================================