# CI runs first; build only proceeds if all checks pass.
#
# Push to any branch: typecheck + lint + test
# Push to dev:        gates + build :dev + :<sha>
# Tag v* (release):   gates + build :latest + :<sha> + :<version>
#
# To cut a release:
#   Create a release via the Forgejo UI on main with a v* tag name.
#   The tag push triggers this workflow; build job pushes :latest + :<version>.
#
# PRs aren't triggered on purpose — this is a solo dev→main flow, so
# gating on branch push is already enough.
#
# Required secrets (repo → Settings → Secrets → Actions):
#   REGISTRY_USER   — your Forgejo username
#   REGISTRY_TOKEN  — Forgejo PAT with write:packages scope
name: CI & Build

on:
  push:
    branches: [dev, main]
    tags: ["v*"]
    paths:
      - "src/**"
      - "frontend/**"
      - "tests/**"
      - "pyproject.toml"
      - "alembic/**"
      - "alembic.ini"
      - "Dockerfile"
      - "assets/**"
      - "fable-mcp/**"
      - ".forgejo/workflows/ci.yml"

# Cancel older runs on the same branch when a newer push lands. Tag runs
# get their own group implicitly (refs/tags/v1.2.3 ≠ refs/heads/dev) and
# are never cancelled, so a release build can't kill itself mid-flight.
concurrency:
  group: ci-${{ github.ref }}
  cancel-in-progress: ${{ !startsWith(github.ref, 'refs/tags/') }}

# Least-privilege default. Jobs that need more (build pushes to the
# registry) upgrade explicitly.
permissions:
  contents: read

env:
  REGISTRY: git.fabledsword.com
  IMAGE: git.fabledsword.com/bvandeusen/fabledassistant

jobs:
  typecheck:
    name: TypeScript typecheck
    runs-on: py3.12-node22
    steps:
      - uses: actions/checkout@v6

      - uses: actions/setup-node@v6
        with:
          node-version: "22"
          cache: "npm"
          cache-dependency-path: frontend/package-lock.json

      - name: Install dependencies
        run: npm ci
        working-directory: frontend

      - name: Type check
        run: npx vue-tsc --noEmit
        working-directory: frontend

  lint:
    name: Python lint
    runs-on: py3.12-node22
    steps:
      - uses: actions/checkout@v6

      - name: Install ruff
        # pipx keeps ruff isolated instead of polluting the system
        # site-packages (the old --break-system-packages was a smell).
        run: pipx install ruff

      - name: Lint
        run: ruff check src/

  test:
    name: Python tests
    runs-on: py3.12-node22
    steps:
      - uses: actions/checkout@v6

      # Python 3.12 is pre-installed in the runner-base image (py3.12-node22).
      - name: Cache pip wheels
        uses: actions/cache@v4
        with:
          path: ~/.cache/pip
          key: pip-${{ hashFiles('pyproject.toml') }}
          restore-keys: pip-

      - name: Create virtual environment
        run: python3.12 -m venv /opt/venv

      - name: Install package with dev deps
        run: |
          /opt/venv/bin/pip install --upgrade pip setuptools wheel
          # http-ece's build-time dep on cryptography fails under PEP 517
          # isolation on this runner image — install it without isolation
          # first so the editable install below finds it already built.
          /opt/venv/bin/pip install --no-build-isolation http-ece
          /opt/venv/bin/pip install -e ".[dev]"

      - name: Run tests
        run: /opt/venv/bin/python -m pytest tests/ -q

  build:
    name: Build & push image
    needs: [typecheck, lint, test]
    # Build on dev branch pushes and version tag pushes only.
    # main branch pushes run the gates for safety but do not build —
    # the release tag (v*) is the sole trigger for a production image.
    if: |
      github.event_name == 'push' &&
      (github.ref == 'refs/heads/dev' || startsWith(github.ref, 'refs/tags/'))
    runs-on: py3.12-node22
    permissions:
      contents: read
      packages: write
    steps:
      - uses: actions/checkout@v6

      - name: Generate image tags and version
        id: tags
        run: |
          TAGS="${{ env.IMAGE }}:${{ github.sha }}"
          BUILD_VERSION="dev"
          if [[ "${{ github.ref }}" == "refs/heads/dev" ]]; then
            TAGS="$TAGS,${{ env.IMAGE }}:dev"
          elif [[ "${{ github.ref }}" == refs/tags/* ]]; then
            TAGS="$TAGS,${{ env.IMAGE }}:latest,${{ env.IMAGE }}:${{ github.ref_name }}"
            BUILD_VERSION="${{ github.ref_name }}"
          fi
          echo "value=$TAGS" >> $GITHUB_OUTPUT
          echo "build_version=$BUILD_VERSION" >> $GITHUB_OUTPUT

      - name: Free disk space
        # Self-hosted runner housekeeping. Two-step cleanup:
        # 1. Prune dangling containers/images globally (stops the runner
        #    from accumulating cruft from past failed builds).
        # 2. Trim the BuildKit layer cache to a 5GB ceiling so the pip
        #    mount cache survives but old intermediate layers don't
        #    accumulate indefinitely.
        run: |
          docker system prune -af || true
          docker builder prune --keep-storage 5g -f || true

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v4

      - name: Log in to Forgejo registry
        uses: docker/login-action@v4
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ secrets.REGISTRY_USER }}
          password: ${{ secrets.REGISTRY_TOKEN }}

      - name: Build and push
        uses: docker/build-push-action@v7
        with:
          context: .
          push: true
          provenance: false
          tags: ${{ steps.tags.outputs.value }}
          build-args: BUILD_VERSION=${{ steps.tags.outputs.build_version }}
          # Registry-backed layer cache. Pull from :cache to prime
          # BuildKit, push updated layers back to :cache so the next
          # build starts warm even if the runner's local cache was
          # pruned. `mode=max` exports all intermediate layers, not
          # just the final image, which is what gives the ~80% speedup.
          cache-from: type=registry,ref=${{ env.IMAGE }}:cache
          cache-to: type=registry,ref=${{ env.IMAGE }}:cache,mode=max