name: Android

# The native Kotlin/Compose client over the shared Rust core (M12).
#
# Replaces the Tauri-mobile lane deleted in step 2. What changed is what this
# builds, not that Android has a lane: the UI is Compose, and the store and sync
# engine are `thoughtsync-core` cross-compiled by cargo-ndk and loaded through
# uniffi.
#
# CI can only prove this BUILDS. A Linux runner cannot execute an APK, so anything
# about feel, touch or on-device correctness is an operator pass on an emulator or
# phone.
#
# The artifact is a SIGNED RELEASE APK when the keystore secret is present, and an
# unsigned debug one when it is not. That distinction is not cosmetic: two builds
# signed with different keys cannot replace one another, and bridging that gap
# means uninstalling first — which deletes the app's database and every local note
# with it (Scribe issue 2803).

on:
  push:
    branches: [dev, main]
    paths:
      - "android/**"
      # The Rust the .so is built from. A core change reaches the phone exactly
      # as it reaches the desktop, so this lane has to rebuild on it.
      - "core/**"
      - "Cargo.toml"
      - "Cargo.lock"
      - ".forgejo/workflows/android.yml"
  workflow_dispatch:

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

env:
  # Silences the JDK 22+ "restricted method in java.lang.System has been called"
  # warning that Gradle 9.1's bundled native-platform jar trips at launch. This
  # targets the LAUNCHER JVM, which is why org.gradle.jvmargs in
  # gradle.properties is not enough on its own (Minstrel hit the same thing).
  JAVA_TOOL_OPTIONS: "--enable-native-access=ALL-UNNAMED"

jobs:
  build:
    name: Kotlin + Rust (APK)
    # runs-on is only a scheduling label (Label Model B). flutter-ci is the
    # proven-working label that can pull our container images.
    runs-on: flutter-ci
    container:
      # The image repurposed from ci-tauri-android in M12 step 3: Rust + the four
      # Android ABIs + cargo-ndk + SDK/NDK + JDK 25 + ktlint + detekt.
      image: git.fabledsword.com/bvandeusen/ci-rust-android:1.97

    permissions:
      contents: write
      # For the dispatch at the end: this lane starts the server image build.
      actions: write

    defaults:
      run:
        working-directory: android

    steps:
      - uses: actions/checkout@v4
        with:
          # Derives a version, so it needs the whole history — see the note in
          # desktop.yml. Depth-1 is silently wrong here, not loudly broken (§6.1).
          fetch-depth: 0

      - name: Cache Gradle and Cargo
        uses: actions/cache@v4
        with:
          path: |
            ~/.gradle/caches
            ~/.gradle/wrapper
            ~/.kotlin
            target
          key: android-${{ hashFiles('android/gradle/wrapper/gradle-wrapper.properties', 'android/gradle/libs.versions.toml', 'android/**/*.gradle.kts', 'Cargo.lock') }}
          restore-keys: |
            android-

      # Everything downstream keys off this: the variant to build, the Cargo
      # profile to build it with, and the version it carries. Decided once so no
      # two Gradle invocations in this run can disagree and force a second
      # four-minute cross-compile.
      - name: Signing key, variant and version
        id: build
        env:
          ANDROID_KEYSTORE_BASE64: ${{ secrets.ANDROID_KEYSTORE_BASE64 }}
        run: |
          # TWO CLOCKS, ON PURPOSE (note 3127 §2). The NAME answers "is this the
          # same code?", so it comes from the COMMIT and a dev build and the main
          # build of one commit read identically. The CODE answers "may this be
          # installed over that?" and must be monotonic BY CONSTRUCTION, because
          # Android hard-fails a downgrade with INSTALL_FAILED_VERSION_DOWNGRADE and
          # leaves a channel you cannot get out of — so it comes from BUILD time,
          # which cannot go backwards. Commit time can.
          version="$(sh ../packaging/version.sh display android)"
          code="$(sh ../packaging/version.sh key android)"
          echo "name=$version" >> $GITHUB_OUTPUT
          echo "code=$code" >> $GITHUB_OUTPUT

          if [ -n "${ANDROID_KEYSTORE_BASE64:-}" ]; then
            printf '%s' "$ANDROID_KEYSTORE_BASE64" | base64 -d > /tmp/thoughtsync-release.jks
            echo "variant=Release" >> $GITHUB_OUTPUT
            echo "label=release" >> $GITHUB_OUTPUT
            # DEBUG profile, in a release APK, deliberately — see the note above
            # the cargoNdk task. The release profile strips the symbols uniffi
            # reads its metadata out of, so `generateUniffiBindings` fails
            # outright (run 4077). Unpicking that is worth doing and is not worth
            # blocking signed builds on.
            echo "profile=debug" >> $GITHUB_OUTPUT
            echo "keystore=/tmp/thoughtsync-release.jks" >> $GITHUB_OUTPUT
            echo "apk=android/app/build/outputs/apk/release/app-release.apk" >> $GITHUB_OUTPUT
            echo "Signed release build — $version (versionCode $code)"
          else
            echo "::warning::No ANDROID_KEYSTORE_BASE64 secret. Building an UNSIGNED DEBUG APK: it cannot be installed over a signed build and cannot self-update."
            echo "variant=Debug" >> $GITHUB_OUTPUT
            echo "label=debug" >> $GITHUB_OUTPUT
            echo "profile=debug" >> $GITHUB_OUTPUT
            echo "keystore=" >> $GITHUB_OUTPUT
            echo "apk=android/app/build/outputs/apk/debug/app-debug.apk" >> $GITHUB_OUTPUT
          fi

      - name: Make gradlew executable
        run: chmod +x ./gradlew

      # Fails loudly here if the wrapper and the image's JDK disagree, rather
      # than thirty seconds into a compile with an opaque version message.
      - name: Gradle wrapper check
        run: ./gradlew --version

      # Cross-compiles the core for four ABIs and generates the Kotlin bindings
      # from the built .so. Run as its own step so a Rust failure is legible as a
      # Rust failure instead of arriving inside a Gradle stack trace.
      - name: Build the native library and bindings
        run: ./gradlew generateUniffiBindings -PTHOUGHTSYNC_CARGO_PROFILE=${{ steps.build.outputs.profile }}

      # The image's PINNED CLIs, not Gradle plugins. ci-rust-android carries both
      # (M12 step 3) precisely so this lane needs no second image, and going
      # through Gradle plugins would mean a second version of each tool resolved
      # at build time and kept in lockstep with the image's by hand.
      #
      # Scoped to src/main: the generated uniffi bindings live under build/ and
      # are not ours to style.
      - name: ktlint
        run: ktlint "app/src/main/**/*.kt"

      - name: detekt
        run: detekt --build-upon-default-config --config config/detekt.yml --input app/src/main/java

      - name: Unit tests
        # Host-JVM tests only. Anything touching the core needs an Android
        # runtime to load the .so, so those are instrumented tests and belong on
        # an emulator, not here — the Rust side is covered by the workspace
        # tests in the desktop lane.
        #
        # DEBUG regardless of what is being packaged: AGP creates unit-test tasks
        # only for `testBuildType`, which is debug, so `testReleaseUnitTest` does
        # not exist (run 4082). It costs one extra Kotlin compile and buys the
        # type-check on the debug variant, which is the one an emulator build
        # would use.
        run: ./gradlew testDebugUnitTest -PTHOUGHTSYNC_CARGO_PROFILE=${{ steps.build.outputs.profile }}

      - name: Assemble the APK
        env:
          # Empty on the unsigned path, which build.gradle.kts reads as "no
          # signing config" rather than as a path to a missing file.
          ANDROID_KEYSTORE_FILE: ${{ steps.build.outputs.keystore }}
          ANDROID_KEYSTORE_PASSWORD: ${{ secrets.ANDROID_KEYSTORE_PASSWORD }}
        run: |
          ./gradlew assemble${{ steps.build.outputs.variant }} \
            -PTHOUGHTSYNC_CARGO_PROFILE=${{ steps.build.outputs.profile }} \
            -PTHOUGHTSYNC_VERSION_NAME=${{ steps.build.outputs.name }} \
            -PTHOUGHTSYNC_VERSION_CODE=${{ steps.build.outputs.code }}

      # Prints the certificate the APK was actually signed with, so the operator
      # can compare it against the fingerprint recorded when the key was
      # generated. Signing with the WRONG key produces a perfectly valid APK that
      # simply refuses to install over the app already on the phone — a failure
      # that otherwise only shows up on the device, after the run is green.
      - name: Show the signing certificate
        if: steps.build.outputs.keystore != ''
        run: |
          apksigner="$(ls /opt/android-sdk/build-tools/*/apksigner | head -1)"
          "$apksigner" verify --print-certs "app/build/outputs/apk/release/app-release.apk"

      # Staged with a STABLE name plus the sidecar the server reads its version
      # out of — an APK keeps that in a binary manifest Python cannot parse, and
      # `aapt` is not on a Quart server. Computed here, where the real values are
      # already known.
      - name: Stage the client for distribution
        if: steps.build.outputs.keystore != ''
        run: |
          mkdir -p dist
          cp "app/build/outputs/apk/release/app-release.apk" dist/thoughtsync.apk
          size="$(wc -c < dist/thoughtsync.apk | tr -d ' ')"
          sha="$(sha256sum dist/thoughtsync.apk | cut -d' ' -f1)"
          cat > dist/thoughtsync-android.json <<JSON
          {
            "version_name": "${{ steps.build.outputs.name }}",
            "version_code": ${{ steps.build.outputs.code }},
            "size": $size,
            "sha256": "$sha"
          }
          JSON
          cat dist/thoughtsync-android.json

      # The rolling channel for this branch, the same fixed-tag releases the desktop
      # bundles use. CI artifacts are per-run and auth-gated, so they are no use as a
      # fetch target; a release asset has a permanent URL. Only ever a SIGNED build —
      # publishing an unsigned APK would offer people something they cannot install
      # over what they already have.
      #
      # `stable` from main is new in M314 step 3, and it is what lets the server image
      # bake in a client that matches its own channel: a :latest image fetches the APK
      # from `stable`, a :dev image from `dev`. Before this, main published no APK at
      # all and every image — stable included — baked in the dev one.
      - name: Publish to the channel for this branch
        if: (github.ref == 'refs/heads/dev' || github.ref == 'refs/heads/main') && steps.build.outputs.keystore != ''
        working-directory: .
        env:
          GITHUB_TOKEN: ${{ github.token }}
        run: |
          case "$GITHUB_REF_NAME" in
            main) RELEASE_TAG=stable; RELEASE_PRERELEASE=false ;;
            *)    RELEASE_TAG=dev;    RELEASE_PRERELEASE=true  ;;
          esac
          export RELEASE_TAG RELEASE_PRERELEASE
          echo "Publishing the APK to the $RELEASE_TAG channel."
          bash desktop/packaging/publish-release.sh

      - name: Upload the APK
        # Mirrored action, never actions/upload-artifact. @v4+ throws
        # GHESNotSupportedError client-side on this hostname, and @v3 is worse —
        # it reports success while Gitea serves artifacts back only through the
        # v4 API, so the upload is stored and invisible. Pinned by SHA because
        # the mirror auto-syncs; full URL because DEFAULT_ACTIONS_URL sends bare
        # owner/repo to github.com. See Scribe issues 2255 / 2270.
        uses: https://git.fabledsword.com/bvandeusen/upload-artifact@cb8afe72b42edc798abfb8fcb556cf660d894245
        with:
          # The APK's variant, NOT the Cargo profile — those are the same word
          # for different things and the profile is pinned to debug (#2810).
          name: thoughtsync-android-${{ steps.build.outputs.label }}-${{ github.sha }}
          path: ${{ steps.build.outputs.apk }}
          if-no-files-found: error

      # The server image bakes in whatever client the dev release holds, so it has
      # to be built AFTER this lane, not alongside it. `ci.yml` stands down on any
      # push that touches the Android app (its `gate` job) and waits to be called
      # from here — that is the other half of this.
      #
      # `always()`: a FAILED Android build must still let the server image through.
      # There is no new client in that case, so it bakes in the previous one, which
      # is exactly right — the alternative is a broken Android lane silently
      # blocking server delivery.
      #
      # Not `if: success()` and not skipped on tags either: every ref that builds an
      # image needs the call, or nothing builds one at all.
      - name: Build the server image now the client is published
        if: always() && (github.ref == 'refs/heads/dev' || github.ref == 'refs/heads/main')
        working-directory: .
        env:
          GITHUB_TOKEN: ${{ github.token }}
        run: |
          # Loud on failure rather than `|| true`: if this call stops working, the
          # symptom is server images silently never being built for Android pushes,
          # which is invisible until someone wonders why the app never updates.
          curl -fsS -X POST \
            -H "Authorization: token $GITHUB_TOKEN" \
            -H "Content-Type: application/json" \
            -d '{"ref":"${{ github.ref_name }}"}' \
            "${{ github.server_url }}/api/v1/repos/${{ github.repository }}/actions/workflows/ci.yml/dispatches"
          echo "Dispatched ci.yml on ${{ github.ref_name }}."