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---
- name: check if kubeconfig kubelet.conf already exists
  stat:
    path: /etc/kubernetes/kubelet.conf
  register: kubeconfig_kubelet_stats

- name: generate kubeadm.config
  template:
    src: kubeadm.config.j2
    dest: /etc/kubernetes/kubeadm.config
  register: kubeadm_config

### cluster not yet initialized

- name: create new cluster
  when: not kubeconfig_kubelet_stats.stat.exists
  block:

  #### kubeadm wants token to come from --config if --config is used
  #### i think this is stupid -> TODO: send bug report
  # - name: generate bootstrap token for new cluster
  #   command: kubeadm token generate
  #   changed_when: False
  #   check_mode: no
  #   register: kubeadm_token_generate

  - name: initialize kubernetes master and store log
    block:
    - name: initialize kubernetes master
      command: "kubeadm init --config /etc/kubernetes/kubeadm.config --node-name {{ inventory_hostname }}{% if kubernetes_cri_socket is defined %} --cri-socket {{ kubernetes_cri_socket }}{% endif %}{% if kubernetes_network_plugin == 'kube-router' %} --skip-phases addon/kube-proxy{% endif %} --skip-token-print"
  #    command: "kubeadm init --config /etc/kubernetes/kubeadm.config{% if kubernetes_cri_socket is defined %} --cri-socket {{ kubernetes_cri_socket }}{% endif %}{% if kubernetes_network_plugin == 'kube-router' %} --skip-phases addon/kube-proxy{% endif %} --token '{{ kubeadm_token_generate.stdout }}' --token-ttl 42m --skip-token-print"
      args:
        creates: /etc/kubernetes/pki/ca.crt
      register: kubeadm_init

    always:
    - name: dump output of kubeadm init to log file
      when: kubeadm_init.changed
      copy:
        content: "{{ kubeadm_init.stdout }}\n"
        dest: /etc/kubernetes/kubeadm-init.log

  - name: create bootstrap token for existing cluster
    command: kubeadm token create --ttl 42m
    check_mode: no
    register: kubeadm_token_generate


### cluster is already initialized but config has changed

- name: upgrade cluster config
  when: kubeconfig_kubelet_stats.stat.exists and kubeadm_config is changed
  block:

  - name: fail for cluster upgrades
    fail:
      msg: "upgrading cluster config is currently not supported!"


### cluster is already initialized

- name: prepare cluster for new nodes
  when: kubeconfig_kubelet_stats.stat.exists and kubeadm_config is not changed
  block:

  - name: fetch list of current nodes
    command: kubectl --kubeconfig /etc/kubernetes/admin.conf get nodes -o name
    changed_when: False
    check_mode: no
    register: kubectl_node_list

  - name: save list of current nodes
    set_fact:
      kubernetes_current_nodes: "{{ kubectl_node_list.stdout_lines | map('replace', 'node/', '') | list }}"

  - name: create bootstrap token for existing cluster
    when: "groups['_kubernetes_nodes_'] | difference(kubernetes_current_nodes) | length > 0"
    command: kubeadm token create --ttl 42m
    check_mode: no
    register: kubeadm_token_create


## calculate certificate digest

- name: install openssl
  apt:
    name: openssl
    state: present

- name: get ca certificate digest
  shell: "set -o pipefail && openssl x509 -pubkey -in /etc/kubernetes/pki/ca.crt | openssl rsa -pubin -outform der 2>/dev/null | openssl dgst -sha256 -hex | sed 's/^.* //'"
  args:
    executable: /bin/bash
  check_mode: no
  register: kube_ca_openssl
  changed_when: False

- name: set variables needed by kubernetes/nodes to join the cluster
  set_fact:
    kube_bootstrap_token: "{% if kubeadm_token_generate.stdout is defined %}{{ kubeadm_token_generate.stdout }}{% elif kubeadm_token_create.stdout is defined %}{{ kubeadm_token_create.stdout }}{% endif %}"
    kube_bootstrap_ca_cert_hash: "sha256:{{ kube_ca_openssl.stdout }}"
  delegate_to: "{{ item }}"
  delegate_facts: True
  loop: "{{ groups['_kubernetes_nodes_'] }}"


## Network Plugin

# - name: install network plugin
#   include_tasks: "net_{{ kubernetes_network_plugin }}.yml"