name: CI

# Pre-merge checks. Runs on the dev branch and on every pull request aimed at
# dev or main, so breakage is caught before it reaches main and triggers a
# release.
#
# On a push to dev it also publishes the build as a dev-channel prerelease, so
# the in-app updater can offer it to anyone who has switched to that channel.
# Prereleases are used deliberately: GitHub's "latest release" endpoint skips
# them, so a production-channel user never sees a dev build. Pull requests only
# build and check — they never publish, which keeps a PR from a fork from
# shipping anything.
on:
  push:
    branches: [ dev ]
  pull_request:
    branches: [ main, dev ]
  workflow_dispatch:

# Needed to publish the dev-channel prerelease below.
permissions:
  contents: write

# A newer push to the same branch or PR makes the in-flight run obsolete.
concurrency:
  group: ci-${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

jobs:
  build:
    name: Build and check
    runs-on: ubuntu-latest
    outputs:
      version: ${{ steps.stage.outputs.version }}
    env:
      # Stamp the APK as a dev-channel build exactly when it is a build of the
      # dev branch, which is exactly when it can be published below. Pull
      # request builds run against refs/pull/N/merge, so they stay unstamped at
      # <series>.0-dev: they are never published and must not claim a channel
      # version.
      #
      # This condition has to stay in step with the publish steps' own. Stamping
      # a build the publish steps would ship, or shipping one this left
      # unstamped, both end the same way — an APK claiming versionCode 1, which
      # the updater can never see as an upgrade over anything.
      PLG_CHANNEL: ${{ github.ref == 'refs/heads/dev' && 'dev' || '' }}
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Set up JDK 17
        uses: actions/setup-java@v4
        with:
          distribution: temurin
          java-version: '17'
          cache: gradle

      - name: Set up Android SDK
        uses: android-actions/setup-android@v4

      - name: Build debug APK
        run: ./gradlew assembleDebug --no-daemon

      - name: Run unit tests
        run: ./gradlew testDebugUnitTest --no-daemon

      - name: Run Android lint
        run: ./gradlew lintDebug --no-daemon

      - name: Upload debug APK
        uses: actions/upload-artifact@v4
        with:
          name: ProLibertateGames-debug-apk
          path: app/build/outputs/apk/debug/app-debug.apk
          if-no-files-found: error
          retention-days: 14

      - name: Upload lint and test reports
        # Reports are most useful precisely when a step above failed.
        if: always()
        uses: actions/upload-artifact@v4
        with:
          name: ProLibertateGames-reports
          path: |
            app/build/reports/
          if-no-files-found: ignore
          retention-days: 14

      # Everything below publishes the dev channel, and only ever from the dev
      # branch itself, after it has built, tested and linted clean above.
      #
      # Gated on the branch alone rather than on the event, which is how
      # release.yml has always gated main. A pull request is still excluded
      # without needing to name it: a PR build runs against refs/pull/N/merge,
      # never refs/heads/dev, so a fork still cannot ship anything.
      - name: Stage dev APK
        id: stage
        if: github.ref == 'refs/heads/dev'
        run: |
          set -euo pipefail
          # The series comes from gradle.properties, which is the same file the
          # build read when it stamped the APK — so the tag and what is inside
          # it cannot name different versions.
          series="$(sed -n 's/^plgVersionSeries=//p' gradle.properties)"
          test -n "$series"
          version="v${series}.${{ github.run_number }}-dev"
          src="app/build/outputs/apk/debug/app-debug.apk"
          dest="ProLibertateGames-${version}.apk"
          cp "$src" "$dest"
          echo "version=$version" >> "$GITHUB_OUTPUT"
          echo "apk=$dest" >> "$GITHUB_OUTPUT"

      - name: Upload staged dev APK for the Pages deploy
        if: github.ref == 'refs/heads/dev'
        uses: actions/upload-artifact@v4
        with:
          name: plg-dev-staged
          path: ${{ steps.stage.outputs.apk }}
          if-no-files-found: error
          retention-days: 1

      - name: Publish dev channel prerelease
        if: github.ref == 'refs/heads/dev'
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          set -euo pipefail
          gh release create "${{ steps.stage.outputs.version }}" \
            "${{ steps.stage.outputs.apk }}" \
            --repo "${{ github.repository }}" \
            --target "${{ github.sha }}" \
            --title "ProLibertateGames ${{ steps.stage.outputs.version }}" \
            --prerelease \
            --notes "Automated **dev channel** build from \`${{ github.sha }}\` on \`dev\`.

          Preview build: newer than production, and less tested. Switch to the
          Dev update channel in Settings to be offered these. Marked as a
          prerelease so production-channel installs never see it."

  # Publishes the build to https://plg.wallacenet.ca (Cloudflare Pages). Runs
  # alongside the GitHub release above for one deployment so already-installed
  # apps, which still read GitHub, can fetch the updater that reads Cloudflare.
  #
  # Both workflows deploy into one Pages site, and a deploy replaces the whole
  # site, so they share a concurrency group and never run at the same time.
  deploy-pages:
    name: Deploy to Cloudflare Pages
    needs: build
    if: github.ref == 'refs/heads/dev'
    runs-on: ubuntu-latest
    concurrency:
      group: plg-pages-deploy
      cancel-in-progress: false
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Download staged APK
        uses: actions/download-artifact@v4
        with:
          name: plg-dev-staged
          path: staged

      - name: Assemble site
        run: .github/scripts/stage-pages-site.sh dev "${{ needs.build.outputs.version }}" "staged/ProLibertateGames-${{ needs.build.outputs.version }}.apk"

      - name: Deploy
        env:
          CLOUDFLARE_API_TOKEN: ${{ secrets.CLOUDFLARE_API_TOKEN }}
          CLOUDFLARE_ACCOUNT_ID: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
        run: |
          set -euo pipefail
          # Creates the project on first run; fails harmlessly if it exists.
          npx --yes wrangler@3 pages project create plg --production-branch main || true
          # --branch main makes this the production deployment, which is what
          # plg.wallacenet.ca serves, whichever branch the workflow ran on.
          npx --yes wrangler@3 pages deploy pages-out --project-name plg --branch main --commit-dirty=true