name: CI

# The Python side (src/ml training/evaluation stack, archive backfills), on
# every push and PR to master:
#   1. formatting contract (black + isort, config in pyproject.toml)
#   2. flake8 hard-error gate (syntax, undefined names)
#   3. the pytest suite: synthetic data, no network; the database tests run
#      against a throwaway PostgreSQL service (TEST_DATABASE_URL, as in rust.yml)
# The service itself (ping-collector) is checked by rust.yml. Production is a
# systemd unit deployed by `git pull` + scripts/install.sh on the server.

on:
  push:
    branches: [master, develop]
  pull_request:
    branches: [master]
  schedule:
    # daily, catches dependency drift
    - cron: "0 2 * * *"
  workflow_dispatch:

env:
  PYTHON_VERSION: "3.11" # pandas 2.0.3 ships no 3.12 wheels; psycopg2-binary 2.9.9 breaks on 3.13

jobs:
  lint:
    name: Format & lint
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-python@v5
        with:
          python-version: ${{ env.PYTHON_VERSION }}
          cache: pip
          cache-dependency-path: requirements-dev.txt

      - name: Install tools
        run: |
          python -m pip install --upgrade pip --root-user-action=ignore
          pip install --root-user-action=ignore black==26.5.1 isort==5.12.0 flake8==6.1.0

      - name: black
        run: black --check --diff src/ scripts/ tests/ rust/forecast/testdata rust/collector/testdata

      - name: isort
        run: isort --check-only --diff src/ scripts/ tests/

      - name: flake8 (errors only)
        run: flake8 src/ scripts/ tests/ --count --select=E9,F63,F7,F82 --show-source --statistics

  test:
    name: Test suite
    runs-on: ubuntu-latest
    services:
      postgres:
        image: postgres:16
        env:
          POSTGRES_PASSWORD: ping
          POSTGRES_DB: ping
        options: >-
          --health-cmd pg_isready
          --health-interval 5s
          --health-timeout 5s
          --health-retries 20
    env:
      TEST_DATABASE_URL: postgres://postgres:ping@postgres:5432/ping
    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-python@v5
        with:
          python-version: ${{ env.PYTHON_VERSION }}
          cache: pip
          cache-dependency-path: |
            requirements.txt
            requirements-dev.txt

      - name: Install dependencies
        run: |
          python -m pip install --upgrade pip --root-user-action=ignore
          pip install --root-user-action=ignore -r requirements.txt pytest==9.1.1

      - name: pytest
        run: pytest -q -p no:cacheprovider -rs