#!/usr/bin/env bash
# gioui v0.10.x Android bug: after the activity is recreated (relaunch,
# config change), the second GioView.onCreateView sends its window-creation
# ack on the UI thread with no receiver -> the UI thread deadlocks, the
# window never gets an input channel, the app is black and unresponsive.
#
# This script runs the stock gioui "hello" example on an emulator, recreates
# its activity with a uiMode toggle, taps it, and greps logcat.
#
#   scripts/repro_gioui_hang.sh [avd] [apk]    (apk omitted: build stock example)
#   exit 0 = REPRODUCED, 1 = clean, 2 = setup failure
set -euo pipefail

AVD=${1:-pad_avd}
APK=${2:-}
SDK=${ANDROID_HOME:-$HOME/android-sdk}
export PATH=$PATH:$HOME/go/bin:$SDK/platform-tools:$SDK/build-tools/35.0.0
say() { printf '\n=== %s\n' "$*"; }
die() { say "FAIL: $*"; exit 2; }

# 1. Build the stock example, if an APK was not supplied
if [ -z "$APK" ]; then
  say "building stock gioui.org/example hello (v0.10.3)"
  SRC=$(mktemp -d)
  go mod download gioui.org/example@v0.10.3
  cp "$HOME/go/pkg/mod/gioui.org/example@v0.10.3/hello/hello.go" "$SRC/main.go"
  printf 'module hello\n\ngo 1.23\n\nrequire gioui.org v0.10.3\n' > "$SRC/go.mod"
  (cd "$SRC" && go mod tidy && gogio -target android -targetsdk 34 -arch amd64 -o "$SRC/hello.apk" .)
  APK=$SRC/hello.apk
fi
[ -f "$APK" ] || die "APK not found: $APK"

# 2. Emulator: reuse a booted one, else boot $AVD
say "emulator ($AVD)"
EMU=""
for _ in $(seq 1 60); do
  EMU=$(adb devices | awk '$1 ~ /^emulator-/ {print $1; exit}')
  [ -n "$EMU" ] && [ "$(adb -s "$EMU" shell getprop sys.boot_completed 2>/dev/null | tr -d '\r')" = "1" ] && break
  [ -z "$EMU" ] && emulator -avd "$AVD" -no-window -no-audio -no-boot-anim -gpu swiftshader_indirect >/dev/null 2>&1 &
  sleep 5
done
[ -n "$EMU" ] || die "no booted emulator"
say "emulator: $EMU"

# 3. Install + launch
APPID=localhost.hello   # gogio's default app id for module "hello"
adb -s "$EMU" install -r "$APK" >/dev/null
adb -s "$EMU" shell am start -S -n "$APPID/org.gioui.GioActivity" >/dev/null
sleep 5
adb -s "$EMU" shell pidof "$APPID" >/dev/null || die "app did not start"

# 4. Recreate the activity, then tap and check logcat.
#    Toggle to the OPPOSITE uiMode: a no-op toggle recreates nothing.
case $(adb -s "$EMU" shell cmd uimode night | tr -d '\r') in
  *yes*) adb -s "$EMU" shell cmd uimode night no >/dev/null ;;
  *)     adb -s "$EMU" shell cmd uimode night yes >/dev/null ;;
esac
sleep 5
adb -s "$EMU" logcat -c
adb -s "$EMU" shell input tap 540 1200
sleep 2

# 5. Verdict
adb -s "$EMU" exec-out screencap -p > /tmp/gioui-hang-repro.png
if adb -s "$EMU" logcat -d | grep -q NO_INPUT_CHANNEL; then
  say "REPRODUCED: window has NO_INPUT_CHANNEL after recreation (screenshot: /tmp/gioui-hang-repro.png)"
  exit 0
fi
say "NOT reproduced: gioui handles re-attach cleanly"
exit 1