---
- name: Install and Configure Borg Backup Client
  hosts: backup_clients
  gather_facts: yes
  become: yes

  vars:
    backup_repo_server: "backup01.mbotechit.de"
    backup_repo_base: "/backup/repos"
    backup_user: "backup"
    backup_ssh_key_path: "/root/.ssh/mbo-backup-key.ed25519"
    backup_script_dir: "/usr/local/bin/mbo-backup"
    backup_log_dir: "/var/log/mbo-backup"
    borg_version: "1.4.0"

  tasks:
    # ======================
    # 1. System Dependencies
    # ======================
    - name: Update APT cache
      apt:
        update_cache: yes
        cache_valid_time: 3600
      when: ansible_os_family == "Debian"

    - name: Install Borg + Dependencies
      apt:
        name:
          - borgbackup
          - openssh-client
          - python3
          - python3-pip
          - curl
          - jq
        state: present
      when: ansible_os_family == "Debian"

    - name: Install Borg + Dependencies (RedHat)
      yum:
        name:
          - borgbackup
          - openssh-clients
          - python3
          - python3-pip
          - curl
          - jq
        state: present
      when: ansible_os_family == "RedHat"

    # ======================
    # 2. SSH Key Setup
    # ======================
    - name: Create SSH directory for root
      file:
        path: "/root/.ssh"
        state: directory
        mode: "0700"

    - name: Copy Borg SSH key from Ansible host
      copy:
        src: "files/mbo-backup-key.ed25519"
        dest: "{{ backup_ssh_key_path }}"
        mode: "0600"
        owner: root
        group: root
      register: ssh_key_copied

    - name: Generate SSH key if not provided
      command: "ssh-keygen -t ed25519 -N '' -f {{ backup_ssh_key_path }} -C 'borg-backup@{{ inventory_hostname }}'"
      when: ssh_key_copied is failed
      ignore_errors: yes

    - name: Ensure SSH public key exists
      command: "ssh-keygen -y -f {{ backup_ssh_key_path }} > {{ backup_ssh_key_path }}.pub"
      when: not ansible_check_mode

    # ======================
    # 3. Backup Script Installation
    # ======================
    - name: Create backup script directory
      file:
        path: "{{ backup_script_dir }}"
        state: directory
        mode: "0755"

    - name: Create backup log directory
      file:
        path: "{{ backup_log_dir }}"
        state: directory
        mode: "0755"
        owner: root
        group: root

    - name: Deploy Borg backup wrapper script
      template:
        src: "borg-backup.sh.j2"
        dest: "{{ backup_script_dir }}/borg-backup.sh"
        mode: "0755"
        owner: root
        group: root

    - name: Deploy Docker pre-backup hook
      template:
        src: "pre-backup-docker.sh.j2"
        dest: "{{ backup_script_dir }}/pre-backup-docker.sh"
        mode: "0755"
        owner: root
        group: root
      when: '"docker" in ansible_facts.packages or ansible_docker_containers is defined'

    - name: Deploy backup status reporter
      template:
        src: "backup-status-reporter.sh.j2"
        dest: "{{ backup_script_dir }}/backup-status-reporter.sh"
        mode: "0755"
        owner: root
        group: root

    # ======================
    # 4. SSH Config for Backup Server
    # ======================
    - name: Create SSH config entry for backup server
      blockinfile:
        path: "/root/.ssh/config"
        create: yes
        mode: "0600"
        block: |
          Host {{ backup_repo_server }}
              HostName {{ backup_repo_server }}
              User backup
              IdentityFile {{ backup_ssh_key_path }}
              StrictHostKeyChecking accept-new
              UserKnownHostsFile /root/.ssh/known_hosts

    # ======================
    # 5. Systemd Service & Timer
    # ======================
    - name: Create systemd service file
      template:
        src: "borg-backup.service.j2"
        dest: "/etc/systemd/system/mbo-backup.service"
        mode: "0644"

    - name: Create systemd timer file
      template:
        src: "borg-backup.timer.j2"
        dest: "/etc/systemd/system/mbo-backup.timer"
        mode: "0644"

    - name: Reload systemd daemon
      systemd:
        daemon_reload: yes

    - name: Enable and start Borg backup timer
      systemd:
        name: mbo-backup.timer
        enabled: yes
        state: started

    # ======================
    # 6. Verify Installation
    # ======================
    - name: Check Borg version
      command: "borg --version"
      register: borg_version_check
      changed_when: false

    - name: Test SSH connection to backup server
      command: "ssh -o ConnectTimeout=5 {{ backup_repo_server }} 'echo OK'"
      register: ssh_test
      changed_when: false
      ignore_errors: yes

    - name: Display verification results
      debug:
        msg: |
          ✓ Borg {{ borg_version_check.stdout }}
          ✓ SSH Test: {{ ssh_test.stdout | default('FAILED') }}
          ✓ Backup Script Dir: {{ backup_script_dir }}
          ✓ Timer Status: systemctl status mbo-backup.timer
          ✓ Next Backup: systemctl list-timers mbo-backup.timer

  handlers:
    - name: Reload systemd
      systemd:
        daemon_reload: yes