#!/bin/sh
# Builds GingerCal.apk for Android 2.3 (API 10) without Gradle.
#
# Needs: JDK 11+ (javac, keytool), python3 with Pillow (icon), and three tools:
#   D8         command that runs d8            (Android SDK build-tools; default "d8" on PATH)
#   APKTOOL    path to apktool.jar             (https://apktool.org; bundles aapt and smali)
#   APKSIGNER  path to apksigner.jar           (Android SDK build-tools/<ver>/lib/apksigner.jar)
# Optional:
#   ANDROID_JAR  a real platforms/android-10/android.jar; otherwise ./stubs is used to compile
#   KEYSTORE     signing keystore (created on first build; keep it so updates install over)
set -eu
cd "$(dirname "$0")"
OUT=build
D8=${D8:-d8}
APKTOOL=${APKTOOL:?set APKTOOL=/path/to/apktool.jar}
APKSIGNER=${APKSIGNER:?set APKSIGNER=/path/to/apksigner.jar}
KS=${KEYSTORE:-gingercal.keystore}
VERSION_CODE=$(sed -n 's/.*android:versionCode="\([0-9]*\)".*/\1/p' AndroidManifest.xml)
VERSION_NAME=$(sed -n 's/.*android:versionName="\([^"]*\)".*/\1/p' AndroidManifest.xml)

rm -rf "$OUT"
mkdir -p "$OUT/stubs" "$OUT/classes" "$OUT/dex" "$OUT/apk/res/drawable" "$OUT/apk/res/drawable-ldpi"

# 1. compile
if [ -n "${ANDROID_JAR:-}" ]; then
  CP="$ANDROID_JAR"
else
  javac -nowarn -Xlint:none --release 8 -d "$OUT/stubs" $(find stubs -name "*.java") 2>/dev/null
  CP="$OUT/stubs"
fi
# Java 8 bytecode, Java 6-era APIs only (Android 2.3 runs a Harmony class library).
javac --release 8 -encoding UTF-8 -Xlint:-options -cp "$CP" -d "$OUT/classes" $(find src android -name '*.java')
python3 tools/strip_method_params.py $(find "$OUT/classes" -name '*.class')

# 2. dex (format 035 for Dalvik), then disassemble so smali re-assembles a clean dex
$D8 --min-api 9 --release --output "$OUT/dex" $(find "$OUT/classes" -name '*.class') >"$OUT/d8.log" 2>&1 \
  || { cat "$OUT/d8.log"; exit 1; }
mkdir -p "$OUT/tools"
javac -nowarn -cp "$APKTOOL" -d "$OUT/tools" tools/Disassemble.java
java -cp "$APKTOOL:$OUT/tools" Disassemble "$OUT/dex/classes.dex" "$OUT/apk/smali" 8

# 3. resources + manifest, compiled by real aapt (v1, the tool of the Gingerbread era)
cp AndroidManifest.xml "$OUT/apk/"
cp -r res/values "$OUT/apk/res/"
python3 tools/mkicon.py "$OUT/apk/res/drawable/icon.png" 48
python3 tools/mkicon.py "$OUT/apk/res/drawable-ldpi/icon.png" 36
cat > "$OUT/apk/apktool.yml" <<EOF
version: 2.9.3
apkFileName: GingerCal.apk
isFrameworkApk: false
usesFramework:
  ids:
  - 1
  tag: null
sdkInfo:
  minSdkVersion: 8
  targetSdkVersion: 10
packageInfo:
  forcedPackageId: 127
  renameManifestPackage: null
versionInfo:
  versionCode: $VERSION_CODE
  versionName: $VERSION_NAME
resourcesAreCompressed: false
sharedLibrary: false
sparseResources: false
doNotCompress:
- resources.arsc
- png
EOF
java -jar "$APKTOOL" -q b --use-aapt1 -api 8 -f -o "$OUT/unsigned.apk" "$OUT/apk"

# 4. sign. Android < 4.3 needs a plain v1 (JAR) signature with SHA-1 and no PKCS#7 signed
#    attributes; apksigner picks exactly that for --min-sdk-version 8. (jarsigner does not.)
if [ ! -f "$KS" ]; then
  keytool -genkeypair -keystore "$KS" -storetype PKCS12 -storepass android -keypass android \
    -alias gingercal -keyalg RSA -keysize 2048 -sigalg SHA1withRSA -validity 10000 -dname "CN=GingerCal" 2>/dev/null
fi
java -jar "$APKSIGNER" sign --ks "$KS" --ks-key-alias gingercal --ks-pass pass:android --key-pass pass:android \
  --min-sdk-version 8 --v1-signing-enabled true --v2-signing-enabled false --v3-signing-enabled false \
  --v4-signing-enabled false --out "$OUT/signed.apk" "$OUT/unsigned.apk"
python3 tools/zipalign.py "$OUT/signed.apk" GingerCal.apk

# 5. refuse to ship anything Android 2.3 would reject
java -jar "$APKSIGNER" verify --min-sdk-version 8 --max-sdk-version 10 GingerCal.apk
python3 tools/check_dex.py GingerCal.apk
ls -l GingerCal.apk