#!/data/data/com.termux/files/usr/bin/bash
set -e

ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
AB_HOME="${ANDROID_BUILDER_HOME:-$HOME/android-builder}"
SDK="$HOME/android-sdk"
PLATFORM="${ANDROID_BUILDER_PLATFORM:-android-33}"
GRADLE_VERSION="${ANDROID_BUILDER_GRADLE_VERSION:-8.7}"
AGP_VERSION="${ANDROID_BUILDER_AGP_VERSION:-8.5.2}"
GRADLE_DISTRIBUTION_SHA256="${ANDROID_BUILDER_GRADLE_DISTRIBUTION_SHA256:-544c35d6bd849ae8a5ed0bcea39ba677dc40f49df7d1835561582da2009b961d}"
TEMPLATE_DIR="$ROOT_DIR/templates/gradle-wrapper"

ensure_termux() {
  if [ -z "${PREFIX:-}" ] || [ ! -d "/data/data/com.termux/files/usr" ]; then
    echo "Error: this command must be run inside Termux."
    exit 1
  fi
}

set_gradle_wrapper_sha256() {
  WRAPPER_PROPERTIES="$1"

  if grep -q '^distributionSha256Sum=' "$WRAPPER_PROPERTIES"; then
    sed -i "s/^distributionSha256Sum=.*/distributionSha256Sum=$GRADLE_DISTRIBUTION_SHA256/" "$WRAPPER_PROPERTIES"
  else
    printf '\ndistributionSha256Sum=%s\n' "$GRADLE_DISTRIBUTION_SHA256" >> "$WRAPPER_PROPERTIES"
  fi
}

get_project_name() {
  if [ -f settings.gradle ]; then
    DETECTED_NAME="$(grep -E '^rootProject.name[[:space:]]*=' settings.gradle \
      | sed -E 's/.*=[[:space:]]*["'\'']?([^"'\'' ]+)["'\'']?.*/\1/' \
      | head -n 1)"

    [ -n "$DETECTED_NAME" ] && echo "$DETECTED_NAME" && return
  fi

  basename "$PWD"
}

get_build_type() {
  echo "${ANDROID_BUILDER_BUILD_TYPE:-debug}"
}

get_apk_path() {
  case "$(get_build_type)" in
    debug) echo "app/build/outputs/apk/debug/app-debug.apk" ;;
    release) echo "app/build/outputs/apk/release/app-release.apk" ;;
    *) return 1 ;;
  esac
}

create_base_project() {
  NAME="$1"
  MESSAGE="$2"
  PACKAGE="com.example.$(echo "$NAME" | tr '[:upper:]' '[:lower:]' | tr -cd 'a-z0-9')"
  PACKAGE_PATH="$(echo "$PACKAGE" | tr '.' '/')"

  mkdir -p "$NAME/app/src/main/java/$PACKAGE_PATH"
  mkdir -p "$NAME/app/src/main/res/values"

  cat > "$NAME/settings.gradle" <<EOF2
pluginManagement { repositories { google(); mavenCentral(); gradlePluginPortal() } }
dependencyResolutionManagement { repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS); repositories { google(); mavenCentral() } }
rootProject.name="$NAME"
include(":app")
EOF2

  cat > "$NAME/build.gradle" <<'EOF2'
// Root build file intentionally minimal.
EOF2

  cat > "$NAME/gradle.properties" <<EOF2
org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
org.gradle.daemon=true
org.gradle.parallel=true
org.gradle.caching=true
android.aapt2FromMavenOverride=$PREFIX/bin/aapt2
EOF2

  cat > "$NAME/local.properties" <<EOF2
sdk.dir=$SDK
EOF2

  cat > "$NAME/app/build.gradle" <<EOF2
plugins {
    id 'com.android.application' version '$AGP_VERSION'
}

android {
    namespace '$PACKAGE'
    compileSdk 33

    defaultConfig {
        applicationId "$PACKAGE"
        minSdk 24
        targetSdk 33
        versionCode 1
        versionName "1.0"
    }
}
EOF2

  cat > "$NAME/app/src/main/AndroidManifest.xml" <<'EOF2'
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <application
        android:label="@string/app_name"
        android:theme="@style/AppTheme">
        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>
EOF2

  cat > "$NAME/app/src/main/res/values/strings.xml" <<EOF2
<resources>
    <string name="app_name">$NAME</string>
</resources>
EOF2

  cat > "$NAME/app/src/main/res/values/styles.xml" <<'EOF2'
<resources>
    <style name="AppTheme" parent="@android:style/Theme.Material.Light.NoActionBar">
        <item name="android:windowLightStatusBar">true</item>
    </style>
</resources>
EOF2

  cat > "$NAME/app/src/main/java/$PACKAGE_PATH/MainActivity.java" <<EOF2
package $PACKAGE;

import android.app.Activity;
import android.os.Bundle;
import android.view.Gravity;
import android.widget.LinearLayout;
import android.widget.TextView;

public class MainActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        LinearLayout layout = new LinearLayout(this);
        layout.setGravity(Gravity.CENTER);
        layout.setOrientation(LinearLayout.VERTICAL);
        layout.setPadding(32, 32, 32, 32);

        TextView title = new TextView(this);
        title.setText("$NAME");
        title.setTextSize(30);
        title.setGravity(Gravity.CENTER);

        TextView message = new TextView(this);
        message.setText("$MESSAGE");
        message.setTextSize(18);
        message.setGravity(Gravity.CENTER);

        layout.addView(title);
        layout.addView(message);

        setContentView(layout);
    }
}
EOF2

  mkdir -p "$NAME/gradle/wrapper"
  cp "$TEMPLATE_DIR/gradle-wrapper.jar" "$NAME/gradle/wrapper/gradle-wrapper.jar"
  cp "$TEMPLATE_DIR/gradlew" "$NAME/gradlew"
  chmod +x "$NAME/gradlew"

  cat > "$NAME/gradle/wrapper/gradle-wrapper.properties" <<EOF2
distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-$GRADLE_VERSION-bin.zip
distributionSha256Sum=$GRADLE_DISTRIBUTION_SHA256
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
EOF2
  set_gradle_wrapper_sha256 "$NAME/gradle/wrapper/gradle-wrapper.properties"

  echo "Created project: $NAME"
  echo
  echo "Next:"
  echo "  cd $NAME"
  echo "  android-builder build"
  echo "  android-builder export"
  echo "  ./gradlew assembleDebug"
}