---
- hosts: all
  name: Coverage change
  roles:
    - ensure-virtualenv
    - ensure-pip
    - role: ensure-tox
      vars:
        ensure_global_symlinks: true
  tasks:
    - name: Environment setup
      shell:
        cmd: |
          set -e
          virtualenv --system-site-packages {{ ansible_user_dir }}/.venv
      args:
        chdir: "{{ ansible_user_dir }}/{{ zuul.project.src_dir }}"
    - name: Measure coverage with the submitted change
      shell:
        cmd: |
          set -e
          source {{ ansible_user_dir }}/.venv/bin/activate
          tox -e cover | awk '/^[[:alpha:]].*\.py/{if ($3 > 0){ print "-key:"$1 "\n value:" 1-$3/$2; }}
      args:
        chdir: "{{ ansible_user_dir }}/{{ zuul.project.src_dir }}"
      register: coverage_after
      set_fact:
        coverage_after_dict: "{{ coverage_after.stdout | items2dict }}"
    - name: Checkout previous commit
      shell:
        cmd: |
          set -e
          source {{ ansible_user_dir }}/.venv/bin/activate
          git checkout HEAD^
      args:
        chdir: "{{ ansible_user_dir }}/{{ zuul.project.src_dir }}"
    - name: Measure coverage before submitted change
      shell:
        cmd: |
          set -e
          source {{ ansible_user_dir }}/.venv/bin/activate
          tox -e cover | awk '/^[[:alpha:]].*\.py/{if ($3 > 0){ print "-key:"$1 "\n value:" 1-$3/$2; }}
      args:
        chdir: "{{ ansible_user_dir }}/{{ zuul.project.src_dir }}"
      register: coverage_before
      set_fact:
        coverage_before_dict: "{{ coverage_before.stdout | items2dict }}"
    - name: Coverage comparison per file - Check
      assert:
        that: "{{coverage_before_dict[item] | float}} <= {{ coverage_after_dict[item] | float}}"
      fail_msg: |
          Before the change {{ (coverage_before_dict[item] | float)*100 }}% of the lines were covered.
          Now it's {{ (coverage_after_dict[item] | float )*100 }}%. Did you write your unit tests?
      success_msg: |
          File by file code coverage check successful.
      loop: "{{ coverage_after_dict.keys() | sort }}"

    - name: Coverage comparison Total - Check
      assert:
        that: "{{ (coverage_after.stdout | float) }} >= {{ (coverage_before.stdout | float) }}"
        fail_msg: |
          Before the change {{ (coverage_before.stdout | float)*100 }}% of the lines were covered.
          Now it's {{ (coverage_after.stdout | float )*100 }}%. Did you write your unit tests?
        success_msg: |
          Code coverage check successful, {{ (coverage_before.stdout | float) * 100 }}% of code is now covered.