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.
#
# On a push to dev it also publishes the build as a dev-channel prerelease on
# this Gitea instance, so the in-app updater can offer it to anyone on the dev
# channel. Prereleases are used deliberately: the "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.
#
# These files live in .github/workflows/ on purpose: Gitea Actions reads that
# path as well as .gitea/workflows/, so one file serves both. Publishing goes
# through Gitea's REST API (the same routes the app's updater reads) rather
# than the `gh` CLI, which a runner image need not carry.
on:
  push:
    branches: [ dev ]
  pull_request:
    branches: [ main, dev ]
  workflow_dispatch:

# Needed by the job token to create the release and attach the APK.
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
    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.
      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 gates 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 and the offset come 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. The number
          # is run number + offset, exactly the arithmetic build.gradle.kts
          # did for versionCode.
          series="$(sed -n 's/^plgVersionSeries=//p' gradle.properties)"
          offset="$(sed -n 's/^plgVersionRunOffset=//p' gradle.properties)"
          test -n "$series"
          test -n "$offset"
          stamp="$(( ${{ github.run_number }} + offset ))"
          version="v${series}.${stamp}-dev"
          src="app/build/outputs/apk/debug/app-debug.apk"
          dest="ProLibertateGames-${version}.apk"
          cp "$src" "$dest"
          echo "version=$version" >> "$GITHUB_OUTPUT"
          echo "apk=$dest" >> "$GITHUB_OUTPUT"

      - name: Publish dev channel prerelease
        if: github.ref == 'refs/heads/dev'
        env:
          # The job's built-in token: contents: write is declared above.
          GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
          RELEASE_TAG: ${{ steps.stage.outputs.version }}
          RELEASE_APK: ${{ steps.stage.outputs.apk }}
          RELEASE_KIND: prerelease
          RELEASE_TARGET: ${{ github.sha }}
        # One script, also runnable by hand — see docs/CI.md.
        run: ./scripts/publish-release.sh