#!/bin/sh
# Build and publish the signed release APK for Kepr Builds.
#
# The release keystore is read from local.properties (koh-ignored). The script
# checks that configuration before starting Gradle, then validates the produced
# APK's package, version, APK Signature Scheme, and pinned release certificate
# before copying anything to the Kepr staging directory.
set -eu

JAVA_HOME="${JAVA_HOME:-/Applications/Android Studio.app/Contents/jbr/Contents/Home}"
export JAVA_HOME

ROOT_DIR=$(CDPATH= cd -- "$(dirname -- "$0")/.." && pwd)
cd "$ROOT_DIR"

# Keep the tool-selection and public metadata gates shared with the hermetic
# negative-path test; this script owns signing/build orchestration only.
# shellcheck source=scripts/kepr-build-helpers.sh
. "$ROOT_DIR/scripts/kepr-build-helpers.sh"

PROPERTIES_FILE="$ROOT_DIR/local.properties"
if [ ! -r "$PROPERTIES_FILE" ]; then
    echo "refusing to publish: local.properties is missing or unreadable" >&2
    exit 1
fi

property() {
    # Values are inspected only for presence/path checks; never print this file
    # because it contains the release passwords.
    sed -n "s/^$1=//p" "$PROPERTIES_FILE" | sed -n '1p'
}

STORE_FILE_PROPERTY=$(property peachStoreFile)
STORE_PASSWORD=$(property peachStorePassword)
KEY_ALIAS=$(property peachKeyAlias)
KEY_PASSWORD=$(property peachKeyPassword)

if [ -z "$STORE_FILE_PROPERTY" ] || [ -z "$STORE_PASSWORD" ] ||
    [ -z "$KEY_ALIAS" ] || [ -z "$KEY_PASSWORD" ]; then
    echo "refusing to publish: incomplete release signing configuration" >&2
    exit 1
fi

case "$STORE_FILE_PROPERTY" in
    /*) STORE_FILE="$STORE_FILE_PROPERTY" ;;
    *) STORE_FILE="$ROOT_DIR/$STORE_FILE_PROPERTY" ;;
esac
if [ ! -f "$STORE_FILE" ] || [ ! -r "$STORE_FILE" ]; then
    echo "refusing to publish: configured release keystore is missing or unreadable" >&2
    exit 1
fi

# Resolve the SDK from the environment first, then the same local.properties
# Gradle uses. Pick the newest *versioned* build-tools directory containing both
# tools; build-tools/latest is intentionally never trusted or consulted.
SDK_ROOT="${ANDROID_HOME:-${ANDROID_SDK_ROOT:-}}"
if [ -z "$SDK_ROOT" ]; then
    SDK_ROOT=$(property sdk.dir)
fi
if [ -z "$SDK_ROOT" ] || [ ! -d "$SDK_ROOT/build-tools" ]; then
    echo "refusing to publish: Android SDK build-tools directory not found" >&2
    exit 1
fi

BUILD_TOOLS_DIR=$(find_stable_build_tools_dir "$SDK_ROOT" || true)
if [ -z "$BUILD_TOOLS_DIR" ]; then
    echo "refusing to publish: no versioned build-tools directory has apksigner and aapt2" >&2
    exit 1
fi
APKSIGNER="$BUILD_TOOLS_DIR/apksigner"
AAPT2="$BUILD_TOOLS_DIR/aapt2"

ROOT_VERSION=$(read_root_semver "$ROOT_DIR/VERSION" || true)
if [ -z "$ROOT_VERSION" ]; then
    echo "refusing to publish: VERSION is missing or not strict semantic version" >&2
    exit 1
fi

"$ROOT_DIR/gradlew" --no-configuration-cache :app:assembleRelease

case "${KEPR_TARGET:-}" in
    android-arm64)
        APK_NAME="app-arm64-v8a-release.apk"
        EXPECTED_ABI="arm64-v8a"
        ;;
    android-x86)
        APK_NAME="app-x86_64-release.apk"
        EXPECTED_ABI="x86_64"
        ;;
    *)
        echo "refusing to publish: unsupported KEPR_TARGET '${KEPR_TARGET:-unset}'" >&2
        exit 1
        ;;
esac

APK="$ROOT_DIR/app/build/outputs/apk/release/$APK_NAME"
METADATA="$ROOT_DIR/app/build/outputs/apk/release/output-metadata.json"
if [ ! -f "$APK" ] || [ ! -r "$APK" ]; then
    echo "refusing to publish: release APK was not produced" >&2
    exit 1
fi
if [ ! -f "$METADATA" ] || [ ! -r "$METADATA" ]; then
    echo "refusing to publish: Gradle output metadata was not produced" >&2
    exit 1
fi

BADGING_FILE=$(mktemp "${TMPDIR:-/tmp}/peach-apk-badging.XXXXXX")
cleanup_badging() {
    [ -e "$BADGING_FILE" ] && trash "$BADGING_FILE"
}
trap cleanup_badging EXIT HUP INT TERM
"$AAPT2" dump badging "$APK" > "$BADGING_FILE"
if ! validate_release_metadata \
    "$METADATA" \
    "$BADGING_FILE" \
    "$ROOT_VERSION" \
    "com.peachpasswords" \
    "$APK_NAME" \
    "$EXPECTED_ABI"; then
    exit 1
fi

# apksigner's plain verify accepts v1-only APKs, so require an explicit v2/v3/v4
# success line before publication. Capture output in memory; it contains only
# public certificate metadata and is never written with signing secrets.
SIGNING_OUTPUT=$("$APKSIGNER" verify --verbose --print-certs "$APK" 2>/dev/null) || {
    echo "refusing to publish: apksigner verification failed" >&2
    exit 1
}
if ! printf '%s\n' "$SIGNING_OUTPUT" | grep -Eq 'Verified using v[234] scheme.*: true'; then
    echo "refusing to publish: APK is not signed with APK Signature Scheme v2 or newer" >&2
    exit 1
fi

PINNED_RELEASE_CERT_SHA256="e10b975178f0bee7fb5a4802519da70ec2988b6ef7d8c9401fbbcff5a1137668"
CERT_DIGEST_COUNT=$(printf '%s\n' "$SIGNING_OUTPUT" | grep -c 'certificate SHA-256 digest:' || true)
if [ "$CERT_DIGEST_COUNT" -ne 1 ]; then
    echo "refusing to publish: release APK must have exactly one signer certificate" >&2
    exit 1
fi
CERT_DIGEST=$(printf '%s\n' "$SIGNING_OUTPUT" |
    sed -n 's/.*certificate SHA-256 digest:[[:space:]]*//p' |
    sed -n '1p' | tr -d '[:space:]' | tr '[:upper:]' '[:lower:]')
if [ "$CERT_DIGEST" != "$PINNED_RELEASE_CERT_SHA256" ]; then
    echo "refusing to publish: APK signer certificate does not match the pinned Peach release digest" >&2
    exit 1
fi

# Only a fully verified artifact reaches the Kepr staging directory.
mkdir -p "$ROOT_DIR/build/kepr"
cp "$APK" "$ROOT_DIR/build/kepr/peach-android.apk"
echo "release APK verified and staged: build/kepr/peach-android.apk"