name: CI

on:
  push:
    branches: [dev]
  pull_request:

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

jobs:
  lint-check-build:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Set up Node
        uses: actions/setup-node@v4
        with:
          node-version-file: .nvmrc

      - name: Install dependencies
        run: corepack enable && pnpm i --frozen-lockfile

      - name: Lint
        run: pnpm run lint

      - name: Check
        run: pnpm run check

      - name: Check desktop TypeScript
        run: |
          npm ci --prefix electron --ignore-scripts
          npm --prefix electron run build

      - name: Build
        if: github.event_name != 'pull_request'
        run: pnpm run build

      # On a pull request the same build doubles as the preview build: same
      # command, just pointed at the preview origin and with production
      # analytics stripped out. The preview server downloads the artifact
      # produced below; it never checks out or builds a pull request itself,
      # so contributor code only ever executes here, in the runner.
      #
      # The hostname is spelled out rather than templated so that what gets
      # deployed is readable from this file alone. It is one of two places to
      # change if previews move (the other is PREVIEW_DOMAIN on the server).
      - name: Build preview
        if: github.event_name == 'pull_request'
        env:
          HEAD_SHA: ${{ github.event.pull_request.head.sha }}
          VITE_PLATFORM_URL: https://pr-${{ github.event.number }}.preview.flowboat.lol
          VITE_PLATFORM_NAME: "Flotilla PR #${{ github.event.number }}"
          VITE_PLATFORM_DESCRIPTION: "Preview build of coracle/flotilla PR #${{ github.event.number }}. Not the real Flotilla."
        run: |
          export VITE_BUILD_HASH="${HEAD_SHA:0:8}"
          pnpm run build

          # src/app.html hardcodes plausible with data-domain="flotilla.social";
          # a preview must not report into production analytics.
          perl -0777 -i -pe \
            's|<script\s+defer\s+data-domain="[^"]*"\s+src="https://plausible\.coracle\.social/[^"]*"\s*></script>||gs' \
            build/index.html

      # v3, not v4, on purpose: actions/upload-artifact@v4 fails on this Gitea
      # with "GHESNotSupportedError". @actions/artifact v2 decides an instance
      # is GHES purely from GITHUB_SERVER_URL's hostname not being github.com,
      # which is always true here, and the runner overwrites any step-level
      # override of that variable. v3 works, and the preview server fetches
      # the result through the run's artifact download route.
      # (Verified on gitea.coracle.social, act_runner v0.6.1, 2026-09-01.)
      - name: Upload preview
        if: github.event_name == 'pull_request'
        uses: actions/upload-artifact@v3
        with:
          name: preview
          path: build
          retention-days: 7
          if-no-files-found: error