# .github/workflows/ci.yml
#
# Runs on every push to main and on every pull request targeting main.
# Pipeline: golangci-lint → go test → make build
# If all three pass on main, the release workflow is triggered automatically.

name: CI

on:
  push:
    branches: [main]
  pull_request:
    branches: [main]

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

      - uses: actions/setup-go@v5
        with:
          go-version-file: go.mod
          cache: true

      - name: golangci-lint
        uses: golangci/golangci-lint-action@v6
        with:
          version: latest
          args: --timeout=5m ./src/...

  test:
    name: Test
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-go@v5
        with:
          go-version-file: go.mod
          cache: true

      - name: Run tests
        run: go test -v -race -coverprofile=coverage.out ./src/...

      - name: Upload coverage
        uses: actions/upload-artifact@v4
        with:
          name: coverage
          path: coverage.out

  build:
    name: Build
    runs-on: ubuntu-latest
    needs: [lint, test]
    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-go@v5
        with:
          go-version-file: go.mod
          cache: true

      - name: Build binary
        run: make build

      - name: Smoke test binary
        run: ./bin/cheatsh --help

      - name: Upload binary artifact
        uses: actions/upload-artifact@v4
        with:
          name: cheatsh-${{ runner.os }}
          path: bin/cheatsh

  # Only fires on pushes to main (not PRs) after build passes.
  # Checks whether the VERSION file was changed — if so, triggers a release.
  trigger-release:
    name: Trigger Release
    runs-on: ubuntu-latest
    needs: [build]
    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
    outputs:
      version_changed: ${{ steps.check.outputs.changed }}
      version: ${{ steps.check.outputs.version }}
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 2   # need the previous commit to diff

      - name: Check if VERSION changed
        id: check
        run: |
          if git diff HEAD~1 HEAD --name-only | grep -q '^VERSION$'; then
            VERSION=$(cat VERSION)
            echo "changed=true"   >> $GITHUB_OUTPUT
            echo "version=$VERSION" >> $GITHUB_OUTPUT
            echo "VERSION changed to $VERSION — release will be created."
          else
            echo "changed=false" >> $GITHUB_OUTPUT
            echo "VERSION unchanged — skipping release."
          fi

  release:
    name: Release
    needs: [trigger-release]
    if: needs.trigger-release.outputs.version_changed == 'true'
    uses: ./.github/workflows/release.yml
    with:
      version: ${{ needs.trigger-release.outputs.version }}
    secrets: inherit
    permissions:
      contents: write