#!/bin/bash
#############################################################################
##
## Copyright (C) 2021 The Qt Company Ltd.
## Contact: https://www.qt.io/licensing/
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## $QT_BEGIN_LICENSE:GPL-EXCEPT$
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## GNU General Public License Usage
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## General Public License version 3 as published by the Free Software
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#############################################################################
# This util launches the Android emulator and ensures it doesn't stuck/freeze
# by detecting that and restarting it

set -ex

EMULATOR_MAX_RETRIES=5
EMULATOR_EXEC="$ANDROID_SDK_ROOT/emulator/emulator"
ADB_EXEC="$ANDROID_SDK_ROOT/platform-tools/adb"
if [[ -z "${ANDROID_EMULATOR}" ]]; then
    EMULATOR_NAME="@x86emulator"
else
    EMULATOR_NAME="$ANDROID_EMULATOR"
fi


function check_for_android_device
{
    $ADB_EXEC devices \
        | awk 'NR==2{print $2}' | grep -qE '^(online|device)$'
}

function check_if_fully_booted
{
    # The "getprop" command separates lines with \r\n so we trim them
    bootanim=`      $ADB_EXEC shell getprop init.svc.bootanim  | tr -d '\r\n'`
    boot_completed=`$ADB_EXEC shell getprop sys.boot_completed | tr -d '\r\n'`
    [ "$bootanim" = stopped ] && [ "$boot_completed" = 1 ]
}


for counter in `seq 1 ${EMULATOR_MAX_RETRIES}`; do
    $ADB_EXEC start-server

    if check_for_android_device
    then
        echo "Emulator is already running but it shouldn't be. Aborting\!"
        exit 3
    fi

    echo "Starting emulator, try ${counter}/${EMULATOR_MAX_RETRIES}"
    $EMULATOR_EXEC $EMULATOR_NAME -gpu swiftshader_indirect -no-audio -partition-size 4096 -cores 4 -memory 3500 -no-snapshot-load -no-snapshot-save &>/dev/null &
    emulator_pid=$!

    $ADB_EXEC wait-for-device

    # Wait about one minute for the emulator to come up
    emulator_status=down
    for i in `seq 60`
    do
        sleep 1
        if  check_for_android_device  &&  check_if_fully_booted
        then
            emulator_status=up
            break
        fi
    done

    # If emulator status is still offline after timeout period,
    # we can assume it's stuck, and we must restart it
    if [ $emulator_status = up ]
    then
        echo "Emulator started successfully"
        break
    else
        if [ $counter -lt $EMULATOR_MAX_RETRIES ]; then
            echo "Emulator failed to start, forcefully killing current instance and re-starting emulator"
            kill $emulator_pid || true
            sleep 5
        elif [ $counter -eq $EMULATOR_MAX_RETRIES ]; then
            echo "Emulator failed to start, reached maximum number of retries. Aborting\!"
            exit 2
        fi
    fi
done

exit 0