#!/usr/bin/env bash
#
# Build and test this fork directly on the phone, from Termux.
# See CLAUDE.md ("Building on the phone itself") for the SDK setup this expects.
#
# The debug build is the package "de.mm20.launcher2.debug": a separate install from the
# real launcher ("de.mm20.launcher2.release") with its own, initially empty, data directory.
set -euo pipefail

REPO=$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)
PKG=de.mm20.launcher2.debug
ACTIVITY=de.mm20.launcher2.ui.launcher.LauncherActivity
DEBUG_APK=$REPO/app/app/build/outputs/apk/default/debug/app-default-debug.apk
RELEASE_APK=$REPO/app/app/build/outputs/apk/default/release/app-default-release.apk

usage() {
    cat <<'EOF'
Usage: scripts/ondevice.sh <command>

  build     assemble the debug APK
  install   build, then install the debug APK (needs root)
  start     launch the installed debug build
  logs      follow logcat of the running debug build
  crash     print the newest crash report for the debug build
  release   assemble the signed release APK: same package and key as the launcher
            installed from Obtanium, so it installs over it and keeps all data
EOF
}

# Termux ships JDK 21 in $PREFIX; on other machines JAVA_HOME has to be set already.
if [ -z "${JAVA_HOME:-}" ] && [ -n "${PREFIX:-}" ] && [ -d "$PREFIX/lib/jvm/java-21-openjdk" ]; then
    export JAVA_HOME=$PREFIX/lib/jvm/java-21-openjdk
fi

gradle() {
    ( cd "$REPO" && ./gradlew --console=plain "$@" )
}

# Long builds outlive the screen lock; keep the CPU awake until they are done.
wake() {
    command -v termux-wake-lock >/dev/null && termux-wake-lock || true
}

build_debug() {
    wake
    gradle :app:app:assembleDefaultDebug
    ls -l "$DEBUG_APK"
}

# Every su -c argument below mixes two quoting levels: the single quoted parts are handed
# to the root shell as-is (so $( ) and $pid are expanded there), the "..." parts are
# expanded here.
case "${1:-}" in
    build)
        build_debug
        ;;
    install)
        build_debug
        # Termux cannot use pm itself; root can, and can read the APK from ~/sources.
        su -c "pm install -r -d '$DEBUG_APK'"
        ;;
    start)
        su -c "am start -n $PKG/$ACTIVITY"
        ;;
    logs)
        su -c 'pid=$(pidof '"$PKG"')
               if [ -z "$pid" ]; then
                   echo "not running - start it first (scripts/ondevice.sh start)" >&2
                   exit 1
               fi
               exec logcat --pid=$pid'
        ;;
    crash)
        su -c 'for f in $(ls -t /data/system/dropbox/data_app_crash@*.txt 2>/dev/null | head -30); do
                   if grep -q '"$PKG"' "$f"; then echo "== $f"; cat "$f"; break; fi
               done'
        ;;
    release)
        wake
        gradle :app:app:assembleDefaultRelease
        ls -l "$RELEASE_APK"
        ;;
    *)
        usage
        exit 1
        ;;
esac