name: Release — F-Droid repo + Gitea release

# A release is cut by merging a release branch into main with a bumped
# versionName (see docs/RELEASING.md). This workflow reads that versionName and,
# if no matching tag exists yet, runs tests, builds + signs the APK, publishes
# it to the F-Droid repo, and only then creates the vX.Y.Z tag + Gitea release
# itself — the tag is an output of the pipeline, not its trigger. Ordinary
# merges (no version bump) fall through `detect` and do nothing.
#
# A manual workflow_dispatch (from a branch) runs the re-sign-only recovery
# path: it re-signs the existing F-Droid index with the repo key and re-uploads,
# without building an APK or creating a release. Used for key rotation / repo
# recovery.
on:
  push:
    branches: [main]
  workflow_dispatch:

concurrency:
  group: release
  cancel-in-progress: false

jobs:
  # Cheap gate: resolve the version from the committed build.gradle and decide
  # whether this push actually cuts a new release (no tag for it yet). Keeps the
  # heavy job from running on every merge to main.
  detect:
    runs-on: docker
    outputs:
      is_release: ${{ steps.v.outputs.is_release }}
      version: ${{ steps.v.outputs.version }}
      version_code: ${{ steps.v.outputs.version_code }}
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Resolve version and whether it is a new release
        id: v
        env:
          TOKEN: ${{ secrets.GITHUB_TOKEN }}
          API: ${{ github.server_url }}/api/v1/repos/${{ github.repository }}
        run: |
          set -e
          VERSION=$(grep -oP 'versionName\s*=\s*"\K[^"]+' app/build.gradle.kts)
          if [ -z "$VERSION" ]; then echo "No versionName in app/build.gradle.kts" >&2; exit 1; fi
          MAJOR=$(echo "$VERSION" | cut -d. -f1); MINOR=$(echo "$VERSION" | cut -d. -f2); PATCH=$(echo "$VERSION" | cut -d. -f3)
          MAJOR=${MAJOR:-0}; MINOR=${MINOR:-0}; PATCH=${PATCH:-0}
          VERSION_CODE=$(( MAJOR * 10000 + MINOR * 100 + PATCH ))
          echo "version=$VERSION" >> "$GITHUB_OUTPUT"
          echo "version_code=$VERSION_CODE" >> "$GITHUB_OUTPUT"
          echo "Resolved version $VERSION (code $VERSION_CODE)"
          if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
            echo "Manual dispatch — re-sign path, not a release."
            echo "is_release=false" >> "$GITHUB_OUTPUT"
            exit 0
          fi
          # A tag for this version already existing means the release shipped on
          # an earlier push; do nothing. Absent => this merge cuts the release.
          STATUS=$(curl -s -o /dev/null -w '%{http_code}' \
            -H "Authorization: token $TOKEN" "$API/git/refs/tags/v$VERSION")
          if [ "$STATUS" = "200" ]; then
            echo "Tag v$VERSION already exists — nothing to release."
            echo "is_release=false" >> "$GITHUB_OUTPUT"
          else
            echo "No tag for v$VERSION yet — cutting the release."
            echo "is_release=true" >> "$GITHUB_OUTPUT"
          fi

  # Releases: build + sign + publish, then mint the tag and Gitea release.
  # Also runs on manual dispatch, where it skips the build and just re-signs and
  # re-uploads the existing index (recovery path).
  release:
    needs: detect
    if: needs.detect.outputs.is_release == 'true' || github.event_name == 'workflow_dispatch'
    runs-on: docker
    env:
      ANDROID_HOME: /opt/android-sdk
      ANDROID_SDK_ROOT: /opt/android-sdk
      VERSION: ${{ needs.detect.outputs.version }}
      VERSION_CODE: ${{ needs.detect.outputs.version_code }}
      IS_RELEASE: ${{ needs.detect.outputs.is_release }}
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Setup Java
        uses: actions/setup-java@v4
        with:
          distribution: 'zulu'
          java-version: '17'

      - name: Setup Android SDK
        uses: android-actions/setup-android@v3
        with:
          packages: ''

      - name: Setup Android SDK cache
        uses: actions/cache@v4
        with:
          path: /opt/android-sdk
          key: ${{ runner.os }}-android-sdk-37-36.0.0

      - name: Install Android SDK packages
        run: |
          yes | sdkmanager --licenses >/dev/null || true
          sdkmanager \
            "platform-tools" \
            "platforms;android-37.0" \
            "build-tools;36.0.0"

      - name: Setup Gradle cache
        uses: actions/cache@v4
        with:
          path: |
            ~/.gradle/caches
            ~/.gradle/wrapper
          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties', 'gradle/libs.versions.toml') }}
          restore-keys: |
            ${{ runner.os }}-gradle-

      - name: Install jq
        run: |
          set -e
          SUDO=""
          if command -v sudo >/dev/null 2>&1; then SUDO="sudo"; fi
          if command -v apt-get >/dev/null 2>&1; then
            $SUDO apt-get update
            $SUDO apt-get install -y jq
          elif command -v apk >/dev/null 2>&1; then
            $SUDO apk add --no-cache jq
          fi

      - name: Grant execute permission for gradlew
        run: chmod +x ./gradlew

      # The committed versionName is the source of truth. Pin versionCode to the
      # value derived from it so the published APK's code is always
      # MAJOR*10000 + MINOR*100 + PATCH even if the committed code was forgotten.
      - name: Pin versionCode to versionName
        if: env.IS_RELEASE == 'true'
        run: |
          set -e
          sed -i "s/versionCode = .*/versionCode = $VERSION_CODE/" app/build.gradle.kts
          grep -E 'versionName|versionCode' app/build.gradle.kts

      # Test the exact commit being shipped (only on a real release).
      - name: Unit tests
        if: env.IS_RELEASE == 'true'
        run: ./gradlew testDebugUnitTest

      - name: Setup Android Keystore
        if: env.IS_RELEASE == 'true'
        env:
          KEYSTORE_BASE64: ${{ secrets.KEYSTORE_BASE64 }}
          KEY_PASSWORD: ${{ secrets.KEY_PASSWORD }}
          KEY_ALIAS: ${{ secrets.KEY_ALIAS }}
        run: |
          mkdir -p app
          echo "$KEYSTORE_BASE64" | base64 --decode > app/upload-keystore.jks
          cat > key.properties <<EOF
          storePassword=$KEY_PASSWORD
          keyPassword=$KEY_PASSWORD
          keyAlias=$KEY_ALIAS
          storeFile=upload-keystore.jks
          EOF

      - name: Build release APK
        if: env.IS_RELEASE == 'true'
        run: ./gradlew assembleRelease

      - name: Setup F-Droid Server Tools
        run: |
          SUDO=""
          if command -v sudo >/dev/null 2>&1; then SUDO="sudo"; fi
          $SUDO apt-get update
          $SUDO apt-get install -y sshpass python3-pip
          pip3 install --break-system-packages --upgrade fdroidserver

      - name: Fetch existing F-Droid repo from Hetzner
        env:
          HOST: ${{ secrets.HETZNER_HOST }}
          USER: ${{ secrets.HETZNER_USER }}
          PASS: ${{ secrets.HETZNER_PASS }}
        run: |
          set -euo pipefail
          SSH_OPTS="-o StrictHostKeyChecking=no -o ConnectTimeout=20"
          mkdir -p fdroid
          # Pull only the published repo/ (all apps' APKs), any per-app
          # metadata, and the repo icon — enough to rebuild the index without
          # dropping the other apps. The signing key is deliberately NOT pulled
          # from the box; it comes from CI secrets in the next step so it never
          # has to live in the web-served tree.
          sshpass -p "$PASS" scp $SSH_OPTS -r "$USER@$HOST:dev/fdroid/repo" fdroid/ 2>/dev/null || true
          sshpass -p "$PASS" scp $SSH_OPTS -r "$USER@$HOST:dev/fdroid/metadata" fdroid/ 2>/dev/null || true
          sshpass -p "$PASS" scp $SSH_OPTS "$USER@$HOST:dev/fdroid/icon.png" fdroid/ 2>/dev/null || true
          mkdir -p fdroid/repo fdroid/metadata

      - name: Restore F-Droid signing key and config from secrets
        env:
          FDROID_KEYSTORE_BASE64: ${{ secrets.FDROID_KEYSTORE_BASE64 }}
          FDROID_CONFIG_BASE64: ${{ secrets.FDROID_CONFIG_BASE64 }}
        run: |
          set -euo pipefail
          # Fail loudly if the repo key is not configured. NEVER auto-generate
          # one: a fresh key changes the repo fingerprint and breaks every
          # user's pinned repo.
          if [ -z "${FDROID_KEYSTORE_BASE64:-}" ] || [ -z "${FDROID_CONFIG_BASE64:-}" ]; then
            echo "ERROR: FDROID_KEYSTORE_BASE64 / FDROID_CONFIG_BASE64 secrets are not set." >&2
            echo "Refusing to continue — will not auto-generate a new repo key." >&2
            exit 1
          fi
          echo "$FDROID_KEYSTORE_BASE64" | base64 --decode > fdroid/keystore.p12
          echo "$FDROID_CONFIG_BASE64"   | base64 --decode > fdroid/config.yml
          test -s fdroid/keystore.p12
          test -s fdroid/config.yml
          mkdir -p fdroid/repo/icons

      - name: Copy new APK to repo
        if: env.IS_RELEASE == 'true'
        run: |
          set -e
          mkdir -p fdroid/repo
          cp app/build/outputs/apk/release/app-release.apk "fdroid/repo/calendula_v${VERSION}.apk"

      # Per-version "What's New": ensure this version's changelog exists in the
      # fastlane tree (committed at release-cut time for the official repo; this
      # regenerates it from CHANGELOG.md so the self-hosted repo never depends on
      # the commit having happened). The transform below then carries it across.
      - name: Ensure this version's changelog is in the fastlane tree
        if: env.IS_RELEASE == 'true'
        run: bash scripts/sync_changelog_to_fastlane.sh

      - name: Build F-Droid metadata from fastlane (single source of truth)
        run: |
          mkdir -p fdroid/metadata
          # App-level control file (Categories/License/links) for the self-hosted
          # repo's `fdroid update`.
          cp fdroid-metadata/de.jeanlucmakiola.calendula.yml fdroid/metadata/
          # Localized text + graphics + per-version changelogs come from the SAME
          # fastlane tree the official F-Droid repo harvests from source,
          # transformed into the F-Droid repo "localized" layout. One source of
          # truth, both channels.
          bash scripts/fastlane_to_fdroid_localized.sh \
            fastlane/metadata/android \
            fdroid/metadata/de.jeanlucmakiola.calendula

      - name: Generate F-Droid Index
        run: |
          cd fdroid
          fdroid update -c

      - name: Upload repo/ to Hetzner
        env:
          HOST: ${{ secrets.HETZNER_HOST }}
          USER: ${{ secrets.HETZNER_USER }}
          PASS: ${{ secrets.HETZNER_PASS }}
        run: |
          set -euo pipefail
          SSH_OPTS="-o StrictHostKeyChecking=no -o ConnectTimeout=20"
          sshpass -p "$PASS" sftp $SSH_OPTS "$USER@$HOST" <<'SFTP'
          -mkdir dev
          -mkdir dev/fdroid
          SFTP
          # Publish the signed repo/ plus metadata/ (descriptions, screenshots,
          # per-version changelogs) so changelog history survives across
          # releases. keystore.p12 and config.yml are NEVER uploaded.
          sshpass -p "$PASS" scp $SSH_OPTS -r fdroid/repo fdroid/metadata "$USER@$HOST:dev/fdroid/"

      # The APK is published and the index re-signed — now record the release.
      # Creating it with target_commitish makes Gitea create the vX.Y.Z tag at
      # this commit, so the tag only ever marks a fully-shipped release (and a
      # failure before here leaves no tag, so re-running the workflow retries).
      - name: Create tag + Gitea release
        if: env.IS_RELEASE == 'true'
        env:
          TOKEN: ${{ secrets.GITHUB_TOKEN }}
          API: ${{ github.server_url }}/api/v1/repos/${{ github.repository }}
          SHA: ${{ github.sha }}
        run: |
          set -e
          TAG="v$VERSION"
          # Notes = this version's CHANGELOG section.
          awk -v ver="$VERSION" '
            $0 ~ "^## \\[" ver "\\]" { flag = 1; next }
            /^## \[/ { flag = 0 }
            flag' CHANGELOG.md > release-notes.md
          sed -i -e '/./,$!d' release-notes.md
          if [ ! -s release-notes.md ]; then
            echo "_No changelog entry for ${VERSION} — see CHANGELOG.md._" > release-notes.md
          fi
          python3 - "$TAG" "$SHA" <<'PY' > payload.json
          import json, sys
          print(json.dumps({
              "tag_name": sys.argv[1],
              "target_commitish": sys.argv[2],
              "name": sys.argv[1],
              "body": open("release-notes.md").read(),
              "draft": False,
              "prerelease": False,
          }))
          PY
          # Upsert (re-run safe): PATCH if a release for the tag already exists,
          # else POST a new one (which also creates the tag at target_commitish).
          curl -s -H "Authorization: token $TOKEN" "$API/releases/tags/$TAG" > existing.json
          ID=$(jq -r '.id // empty' existing.json 2>/dev/null || true)
          if [ -n "$ID" ]; then
            CODE=$(curl -s -o response.json -w '%{http_code}' -X PATCH \
              -H "Authorization: token $TOKEN" -H "Content-Type: application/json" \
              -d @payload.json "$API/releases/$ID")
            OK=200
          else
            CODE=$(curl -s -o response.json -w '%{http_code}' -X POST \
              -H "Authorization: token $TOKEN" -H "Content-Type: application/json" \
              -d @payload.json "$API/releases")
            OK=201
          fi
          cat response.json
          if [ "$CODE" != "$OK" ]; then
            echo "Release upsert failed with HTTP $CODE (expected $OK)" >&2
            exit 1
          fi
          echo "Created/updated release $TAG at $SHA"

      # Archive the R8 mapping so user crash stacktraces stay deobfuscatable.
      # Attached to the release (it's not an APK, so it fits the no-binaries
      # rule). Best-effort: never fail a release over it.
      - name: Attach R8 mapping to Gitea release
        if: env.IS_RELEASE == 'true'
        continue-on-error: true
        env:
          TOKEN: ${{ secrets.GITHUB_TOKEN }}
          API: ${{ github.server_url }}/api/v1/repos/${{ github.repository }}
        run: |
          set -e
          MAP="app/build/outputs/mapping/release/mapping.txt"
          if [ ! -f "$MAP" ]; then echo "No mapping.txt (R8 off?) — skipping."; exit 0; fi
          TAG="v$VERSION"
          ASSET="mapping-${VERSION}.txt.gz"
          gzip -c "$MAP" > "/tmp/$ASSET"
          ID=$(curl -s -H "Authorization: token $TOKEN" "$API/releases/tags/$TAG" | jq -r '.id // empty')
          if [ -z "$ID" ]; then echo "Could not resolve release id — skipping."; exit 0; fi
          # Replace any prior asset of the same name (re-run safe).
          OLD=$(curl -s -H "Authorization: token $TOKEN" "$API/releases/$ID/assets" \
            | jq -r --arg n "$ASSET" '.[] | select(.name==$n) | .id')
          [ -n "$OLD" ] && curl -s -X DELETE -H "Authorization: token $TOKEN" "$API/releases/$ID/assets/$OLD" >/dev/null || true
          curl -s -X POST -H "Authorization: token $TOKEN" \
            -F "attachment=@/tmp/$ASSET" \
            "$API/releases/$ID/assets?name=$ASSET" -o /dev/null -w "asset upload HTTP %{http_code}\n"