- name: Read and display local SSH public key with user and host info
  hosts: localhost
  connection: local
  gather_facts: true  # Required to access ansible_user and ansible_hostname

  vars:
    ssh_key_type: "rsa"
    public_key_path: "{{ lookup('env', 'HOME') + '/.ssh/id_' + ssh_key_type + '.pub' }}"

  tasks:
    - name: Check if SSH public key file exists
      ansible.builtin.stat:
        path: "{{ public_key_path }}"
      register: ssh_key_file
      tags: [check]

    - name: Fail if SSH public key is missing
      ansible.builtin.fail:
        msg: "Public SSH key not found at {{ public_key_path }}."
      when: not ssh_key_file.stat.exists
      tags: [fail]

    - name: Read SSH public key content
      ansible.builtin.slurp:
        src: "{{ public_key_path }}"
      register: local_public_key
      when: ssh_key_file.stat.exists
      tags: [read]

    - name: Get current user's UID
      ansible.builtin.command: id -u
      register: user_uid
      changed_when: false
      tags: [info]

    - name: Get current user's GID
      ansible.builtin.command: id -g
      register: user_gid
      changed_when: false
      tags: [info]

    - name: Get Docker host (default gateway) IP
      ansible.builtin.shell: "ip route | awk '/default/ {print $3}'"
      register: docker_host_ip
      changed_when: false
      tags: [host_ip]

    - name: Try resolving host.docker.internal
      command: getent hosts host.docker.internal
      register: docker_dns_host
      failed_when: false
      changed_when: false
      tags: [host_ip]


    - name: Display SSH key with user and host information
      ansible.builtin.debug:
        msg: |
          SSH Public Key Info
          ---------------------
          User    : {{ ansible_user }}
          User    : {{ ansible_facts['user_id'] }}
          UID     : {{ user_uid.stdout }}
          GID     : {{ user_gid.stdout }}
          Host    : {{ ansible_hostname }}
          IP Addr : {{ ansible_default_ipv4.address }}
          IPs    : {{ ansible_all_ipv4_addresses }}
          Host    : {{ ansible_facts['hostname'] }}
          Docker Host IP: {{ docker_host_ip.stdout }}
          Host.docker.internal resolves to: {{ docker_dns_host.stdout }}
          Path    : {{ public_key_path }}

          Key:
          {{ local_public_key.content | b64decode }}
      tags: [show]

    - name: Set decoded SSH public key as fact
      set_fact:
        decoded_ssh_key: "{{ local_public_key.content | b64decode }}"
      tags: [read, set_fact]