#!/usr/bin/env bash
# Start the Taler Android AVD. **Default = headless** (no host window).
# Guest GLES still runs via SwiftShader so uiautomator / screenshots work.
#
# Usage:
#   ./start-android-emulator.sh              # headless, background
#   ./start-android-emulator.sh --wait       # headless + wait for boot
#   ./start-android-emulator.sh --windowed   # show emulator window
#   EMULATOR_HEADLESS=0 ./start-android-emulator.sh
#   EMULATOR_GPU=host WINDOWED=1 ./start-android-emulator.sh
#
# Env: EMULATOR_AVD EMULATOR_MEMORY EMULATOR_CORES EMULATOR_GPU
#      EMULATOR_HEADLESS EMULATOR_LOG EMULATOR_BOOT_TIMEOUT EMULATOR_EXTRA_ARGS
#
set -euo pipefail
ROOT=$(cd "$(dirname "$0")" && pwd)
# shellcheck source=lib_android_env.sh
. "$ROOT/lib_android_env.sh"

WAIT=0
for a in "$@"; do
  case "$a" in
    --wait) WAIT=1 ;;
    --windowed| --gui) EMULATOR_HEADLESS=0; export EMULATOR_HEADLESS ;;
    --headless) EMULATOR_HEADLESS=1; export EMULATOR_HEADLESS ;;
    -h|--help)
      sed -n '2,18p' "$0"
      exit 0
      ;;
  esac
done

command -v emulator >/dev/null || {
  echo "emulator not found (ANDROID_HOME=$ANDROID_HOME)" >&2
  exit 2
}
command -v adb >/dev/null || {
  echo "adb not found" >&2
  exit 2
}

# Already booted?
if serial=$(android_adb_serial); [ -n "$serial" ]; then
  boot=$(adb -s "$serial" shell getprop sys.boot_completed 2>/dev/null | tr -d '\r' || true)
  if [ "$boot" = "1" ]; then
    echo "already running: $serial (boot_completed=1) — headless default still applies to *new* starts"
    exit 0
  fi
fi

# Avoid pkill patterns that match this wrapper's argv (self-kill).
mapfile -t EMU_ARGS < <(android_emulator_args "$EMULATOR_AVD")
echo "starting: emulator ${EMU_ARGS[*]}"
echo "  headless=$EMULATOR_HEADLESS  gpu=$EMULATOR_GPU  log=$EMULATOR_LOG"

if [ "${EMULATOR_HEADLESS}" = "1" ]; then
  export QT_QPA_PLATFORM="${QT_QPA_PLATFORM:-offscreen}"
  # Do not require DISPLAY
  unset DISPLAY || true
fi

mkdir -p "$(dirname "$EMULATOR_LOG")"
# Background; do not use pkill -f emulator from callers matching full cmdline
nohup emulator "${EMU_ARGS[@]}" >"$EMULATOR_LOG" 2>&1 &
echo "emulator pid=$!  log=$EMULATOR_LOG"

if [ "$WAIT" != "1" ]; then
  echo "not waiting (pass --wait for boot). adb devices when ready."
  exit 0
fi

echo "waiting for boot (timeout ${EMULATOR_BOOT_TIMEOUT}s)…"
deadline=$((SECONDS + EMULATOR_BOOT_TIMEOUT))
serial=""
while (( SECONDS < deadline )); do
  adb wait-for-device 2>/dev/null || true
  serial=$(android_adb_serial || true)
  if [ -n "$serial" ]; then
    boot=$(adb -s "$serial" shell getprop sys.boot_completed 2>/dev/null | tr -d '\r' || true)
    if [ "$boot" = "1" ]; then
      echo "BOOT_OK serial=$serial headless=$EMULATOR_HEADLESS gpu=$EMULATOR_GPU"
      exit 0
    fi
  fi
  sleep 2
done

echo "boot timeout — last log:" >&2
tail -30 "$EMULATOR_LOG" >&2 || true
exit 3