#!/usr/bin/env bash
# Align Tauri Android project with locally installed SDK (offline builds).
set -euo pipefail

ANDROID_GEN="${1:-/workspace/tauri_app/src-tauri/gen/android}"
ANDROID_HOME="${ANDROID_HOME:-/opt/android-sdk}"
ANDROID_SDK_ROOT="${ANDROID_SDK_ROOT:-${ANDROID_HOME}}"
GRADLE_USER_HOME="${GRADLE_USER_HOME:-/root/.gradle}"

if [ ! -d "${ANDROID_GEN}" ]; then
  echo "Android project not found: ${ANDROID_GEN}" >&2
  exit 1
fi

if [ ! -d "${ANDROID_HOME}/platforms" ] && [ -d /opt/android-sdk-linux/platforms ]; then
  ANDROID_HOME="/opt/android-sdk-linux"
  ANDROID_SDK_ROOT="${ANDROID_HOME}"
fi

if [ ! -d "${ANDROID_HOME}/platforms" ]; then
  echo "Android platforms not found in ${ANDROID_HOME}/platforms" >&2
  exit 1
fi

SDK_LEVEL="$(
  find "${ANDROID_HOME}/platforms" -mindepth 1 -maxdepth 1 -type d -name 'android-*' \
    | sed 's|.*/android-||' \
    | sort -n \
    | tail -n 1
)"

if [ -z "${SDK_LEVEL}" ]; then
  echo "Не удалось определить установленный Android SDK platform" >&2
  exit 1
fi

export ANDROID_COMPILE_SDK="${SDK_LEVEL}"

PLATFORM_DIR="${ANDROID_HOME}/platforms"
# Tauri 2.x templates/plugins request android-36 while the SDK image ships android-35.
for requested in 36 35 34; do
  if [ ! -e "${PLATFORM_DIR}/android-${requested}" ] && [ -d "${PLATFORM_DIR}/android-${SDK_LEVEL}" ]; then
    ln -sfn "android-${SDK_LEVEL}" "${PLATFORM_DIR}/android-${requested}"
    echo "==> Platform symlink: android-${requested} -> android-${SDK_LEVEL}"
  fi
done

while IFS= read -r -d '' gradle_file; do
  sed -i -E "s/compileSdk = [0-9]+/compileSdk = ${SDK_LEVEL}/g" "${gradle_file}"
  sed -i -E "s/targetSdk = [0-9]+/targetSdk = ${SDK_LEVEL}/g" "${gradle_file}"
  sed -i -E "s/compileSdkVersion = [0-9]+/compileSdkVersion = ${SDK_LEVEL}/g" "${gradle_file}"
  sed -i -E "s/compileSdkVersion [0-9]+/compileSdkVersion ${SDK_LEVEL}/g" "${gradle_file}"
  sed -i -E "s/targetSdkVersion = [0-9]+/targetSdkVersion = ${SDK_LEVEL}/g" "${gradle_file}"
  sed -i -E "s/targetSdkVersion [0-9]+/targetSdkVersion ${SDK_LEVEL}/g" "${gradle_file}"
done < <(find "${ANDROID_GEN}" \( -name 'build.gradle.kts' -o -name 'build.gradle' \) -print0 2>/dev/null || true)

ROOT_BUILD="${ANDROID_GEN}/build.gradle.kts"
if [ -f "${ROOT_BUILD}" ] && ! grep -q 'forceOfflineAndroidSdk' "${ROOT_BUILD}"; then
  cat >> "${ROOT_BUILD}" <<EOF

// forceOfflineAndroidSdk: override compileSdk for Tauri plugin subprojects (offline LAN builds)
subprojects {
    afterEvaluate {
        extensions.findByType(com.android.build.gradle.AppExtension::class.java)?.apply {
            compileSdk = ${SDK_LEVEL}
            defaultConfig.targetSdk = ${SDK_LEVEL}
        }
        extensions.findByType(com.android.build.gradle.LibraryExtension::class.java)?.apply {
            compileSdk = ${SDK_LEVEL}
        }
    }
}
EOF
fi

GRADLE_PROPS="${ANDROID_GEN}/gradle.properties"
touch "${GRADLE_PROPS}"
if ! grep -q '^android.builder.sdkDownload=' "${GRADLE_PROPS}"; then
  printf '\n# Offline / isolated network: do not download SDK packages from Google\nandroid.builder.sdkDownload=false\n' >> "${GRADLE_PROPS}"
else
  sed -i 's/^android.builder.sdkDownload=.*/android.builder.sdkDownload=false/' "${GRADLE_PROPS}"
fi

if ! grep -q '^android.compileSdk=' "${GRADLE_PROPS}"; then
  printf 'android.compileSdk=%s\n' "${SDK_LEVEL}" >> "${GRADLE_PROPS}"
else
  sed -i "s/^android.compileSdk=.*/android.compileSdk=${SDK_LEVEL}/" "${GRADLE_PROPS}"
fi

cat > "${ANDROID_GEN}/local.properties" <<EOF
## Autogenerated for offline Docker build. Do not commit.
sdk.dir=${ANDROID_HOME}
EOF

mkdir -p "${GRADLE_USER_HOME}/init.d"
cat > "${GRADLE_USER_HOME}/init.d/force-android-sdk.gradle" <<EOF
def offlineCompileSdk = (System.getenv('ANDROID_COMPILE_SDK') ?: '${SDK_LEVEL}').toInteger()

gradle.beforeProject { project ->
    project.afterEvaluate {
        def androidExt = project.extensions.findByName('android')
        if (androidExt == null) {
            return
        }
        try {
            androidExt.compileSdk = offlineCompileSdk
        } catch (ignored) {
            try {
                androidExt.compileSdkVersion offlineCompileSdk
            } catch (ignored2) {
                // ignore non-Android projects
            }
        }
        try {
            if (androidExt.metaClass.hasProperty(androidExt, 'defaultConfig') && androidExt.defaultConfig != null) {
                androidExt.defaultConfig.targetSdk = offlineCompileSdk
            }
        } catch (ignored) {
            try {
                androidExt.defaultConfig.targetSdkVersion offlineCompileSdk
            } catch (ignored2) {
                // ignore library modules without targetSdk
            }
        }
    }
}
EOF

echo "==> Android SDK patched: compileSdk/targetSdk=${SDK_LEVEL}, sdk.dir=${ANDROID_HOME}, sdkDownload=false"