- hosts: all
  gather_facts: no
  serial: "{{ hosts_per_batch | d(1) | int }}"
  strategy: "{{ hosts_strategy | d('linear') }}"
  tasks:

    # TODO: multiple roles
    - name: get primary role
      set_fact:
        host_primary_role: "{%- if primary_role is defined -%}{{ primary_role }}\
                            {%- elif hostvars[inventory_hostname]['primary_role'] is defined -%}{{ hostvars[inventory_hostname]['primary_role'] }}\
                            {%- else -%}{{ inventory_hostname }}\
                            {%- endif -%}"


    - name: check if role info file exists
      stat:
        path: "{{ (playbook_dir, 'roles', host_primary_role, 'tasks', 'info.yml') | path_join }}"
      delegate_to: localhost
      register: result
      no_log: yes


    - name: get role info
      include_role:
        name: "{{ host_primary_role }}"
        tasks_from: info.yml
        apply:
          no_log: yes
      when: result.stat.exists


    - name: build role dependency list and stage info
      set_fact:
        role_deps: "{{ (([{ 'stage': 6, 'role': host_primary_role }] if role_dependency is not defined else [role_dependency]) +
                        ([role_dependency_common] if (role_dependency_no_common | d(false) == false) else []) +
                        ([{ 'stage': 1, 'role': 'container' }] if 'containers' in group_names else []) +
                        ([{ 'stage': 3, 'role': 'postgres', 'tasks_from': 'integrate.yml' }] if role_use_database | d(false) == true else [])
                       ) | flatten(levels=1) | sort(attribute='stage') }}"
        selected_stages: "{%- if stage is defined and ((stage | string) is search(',')) -%}{{ stage | string | split(',') | list | map('int') | list }}\
                          {%- elif (stage is not defined) or ((stage | int) == 0) -%}{{ [1,2,3,4,5,6,7,8,9] }}\
                          {%- else -%}{{ [stage | int] }}\
                          {%- endif -%}"
        no_log: yes


    - name: show deployment info
      debug:
        msg: "deploying role \"{{ host_primary_role }}\" on host \"{{ inventory_hostname }}\", {{
          (('stages ' if (selected_stages | length > 1) else 'stage ') ~ (selected_stages | join(', ')))
            if ([1,2,3,4,5,6,7,8,9] | symmetric_difference(selected_stages) | list | length > 0) else 'all stages' }}\n\n{{
            'dependencies:\n' ~ (role_deps | map(attribute='stage') | list | zip(
              role_deps | map(attribute='role') | list
            ) | map('join', ': ') | list | join('\n'))
          }}"


    - name: run pre_tasks
      include_tasks: tasks/pre_tasks.yml


    - name: run stages
      include_tasks: tasks/includes/stage.yml
      loop: "{{ selected_stages }}"
      loop_control:
        loop_var: this_stage


    - name: show deployment info
      debug:
        msg: "ok: deployment completed on host \"{{ inventory_hostname }}\""