#!/system/bin/sh

# Copyright 2017-2020 Fairphone B.V.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

set -e
set -u

readonly FILES_TO_WIPE="\
    com.google.android.GoogleCamera/shared_prefs/com.google.android.GoogleCamera_preferences.xml \
    com.android.camera2/shared_prefs/com.android.camera2_preferences.xml
"
readonly PREFERENCE_TO_WIPE_CACHE_FRONT="CachedSupportedPictureSizes_Build_Camera1"
readonly PREFERENCE_TO_WIPE_RES_FRONT="pref_camera_picturesize_front_key"
readonly PREFERENCE_TO_WIPE_CACHE_MAIN="CachedSupportedPictureSizes_Build_Camera0"
readonly PREFERENCE_TO_WIPE_RES_MAIN="pref_camera_picturesize_back_key"

readonly FRONT_CAM_CHANGED_PROPERTY="fp2.cam.front.changed"
readonly MAIN_CAM_CHANGED_PROPERTY="fp2.cam.main.changed"

readonly FRONT_CAM_CHANGED="$(getprop "${FRONT_CAM_CHANGED_PROPERTY}")"
readonly MAIN_CAM_CHANGED="$(getprop "${MAIN_CAM_CHANGED_PROPERTY}")"


# Precondition: file_to_wipe exists
function _remove_preferences() {
    local file_to_wipe="$(readlink -f "$1")"

    local owner=$(stat -c '%U' "${file_to_wipe}")
    local group=$(stat -c '%G' "${file_to_wipe}")
    local access_bits="$(stat -c '%a' "${file_to_wipe}")"
    local context="$(ls -Z "${file_to_wipe}" | grep -o "u:object_r:[^ ]*")"

    if [ "${FRONT_CAM_CHANGED}" == "1" ]
        then
        sed -i "/${PREFERENCE_TO_WIPE_CACHE_FRONT}/d" "${file_to_wipe}"
        sed -i "/${PREFERENCE_TO_WIPE_RES_FRONT}/d" "${file_to_wipe}"
    fi

    if [ "${MAIN_CAM_CHANGED}" == "1" ]
        then
        sed -i "/${PREFERENCE_TO_WIPE_CACHE_MAIN}/d" "${file_to_wipe}"
        sed -i "/${PREFERENCE_TO_WIPE_RES_MAIN}/d" "${file_to_wipe}"
    fi

    chown -f ${owner} "${file_to_wipe}"
    chgrp -f ${group} "${file_to_wipe}"
    chmod "${access_bits}" "${file_to_wipe}"
    chcon "${context}" "${file_to_wipe}"
}


for f in ${FILES_TO_WIPE}; do
    for user in /data/user/*; do
        if [[ -f "${user}/${f}" ]]; then
            _remove_preferences "${user}/${f}"
        fi
    done
done