#  Copyright (C) 2023 The Android Open Source Project
#
#  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.

import xml.etree.ElementTree as ET
import datetime
import os
from os import listdir
from os.path import isfile, join
from enum import Enum
import argparse
import re


class ResourceCategory(Enum):
    Value = 1
    File = 2
    Id = 3


class AdServicesUiUtil:
    PUBLIC_XML_DIR = '../apk/publicres/values/public.xml'
    STRINGS_XML_DIR = '../apk/res/values/strings.xml'
    COLORS_XML_DIR = '../apk/res/values/colors.xml'
    DIMENS_XML_DIR = '../apk/res/values/dimens.xml'
    INTEGERS_XML_DIR = '../apk/res/values/integers.xml'
    STYLES_XML_DIR = '../apk/res/values/styles.xml'
    DRAWABLE_XML_DIR = '../apk/res/drawable/'
    LAYOUT_XML_DIR = '../apk/res/layout/'
    COPYRIGHT_TEXT = f'''<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) {datetime.date.today().year} The Android Open Source Project

    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.
-->
<!-- DO NOT MODIFY. This file is automatically generated by generate_adservices_public_xml.py -->\n'''

    def __init__(self):
        pass

    def _get_next_id(self, existing_mapping, map_start):
        if existing_mapping:
            return int(min(existing_mapping.values()), 0) - 1
        else:
            return int(map_start, 0)

    def _get_existing_tree(self, dir, node_type):
        if not os.path.exists(dir):
            return None, {}
        else:
            root = ET.parse(dir).getroot()
            return root, {
                node.attrib['name']: node.attrib['id']
                for node in root if node.attrib['type'] == node_type
            }

    def _get_updated_resources(self, res_category, res_xml_dir):
        match res_category:
            case ResourceCategory.Value:
                return [node.attrib['name'] for node in ET.parse(res_xml_dir).getroot()]
            case ResourceCategory.File:
                return [file.split('.')[0] for file in listdir(res_xml_dir) if
                        isfile(join(res_xml_dir, file))]
            case ResourceCategory.Id:
                new_strings = set()
                for file in os.scandir(res_xml_dir):
                    for child in ET.parse(file.path).getroot().iter():
                        id_key = [key for key in child.attrib if re.match(r'\{.*\}id', key)]
                        if len(id_key) > 0:
                            new_strings.add(child.attrib[id_key[0]].split('/')[1])
                return new_strings

    def _overwrite_public_xml(self, root, public_xml_dir):
        if os.path.exists(public_xml_dir):
            os.remove(public_xml_dir)

        ET.indent(root, space='    ')
        with open(public_xml_dir, "w+") as file:
            file.write(self.COPYRIGHT_TEXT)
            file.write(ET.tostring(root, encoding="unicode"))

    def update_public_xml(self, res_xml_dir, res_type, res_category, map_start,
                          public_xml_dir=PUBLIC_XML_DIR):
        if not os.path.exists(res_xml_dir):
            return

        res_all = self._get_updated_resources(res_category, res_xml_dir)
        root, mapping = self._get_existing_tree(public_xml_dir, res_type)

        # resources of this type already exist in public.xml
        if mapping:
            res_new = [res for res in res_all if res not in mapping]
            # TO-DO: add code to remove exsting elements when needed.
            res_all = set(res_all)
            deleted_res = set(res for res in mapping if res not in res_all)
        # new type of resources are being added in public.xml
        else:
            res_new = res_all

        if not res_new:
            return

        i_min = self._get_next_id(mapping, map_start)
        for res in res_new:
            added_element = ET.SubElement(root, 'public')
            added_element.set('type', res_type)
            added_element.set('name', res)
            added_element.set('id', hex(i_min))
            i_min -= 1

        self._overwrite_public_xml(root, public_xml_dir)

    def update_adservices_public_xml(self):
        parser = argparse.ArgumentParser()
        parser.add_argument("--enable_ota_layout",
                            help="Enable adding all resource types to public.xml for OTA layout updates",
                            action='store_true', default=False)
        args = parser.parse_args()
        util.update_public_xml(res_xml_dir=self.STRINGS_XML_DIR,
                               res_type='string', res_category=ResourceCategory.Value,
                               map_start=hex(0x7f017fff))
        if args.enable_ota_layout:
            util.update_public_xml(res_xml_dir=self.DIMENS_XML_DIR,
                                   res_type='dimen', res_category=ResourceCategory.Value,
                                   map_start=hex(0x7f027fff))
            util.update_public_xml(res_xml_dir=self.COLORS_XML_DIR,
                                   res_type='color', res_category=ResourceCategory.Value,
                                   map_start=hex(0x7f037fff))
            util.update_public_xml(res_xml_dir=self.INTEGERS_XML_DIR,
                                   res_type='integer', res_category=ResourceCategory.Value,
                                   map_start=hex(0x7f047fff))
            util.update_public_xml(res_xml_dir=self.STYLES_XML_DIR,
                                   res_type='style', res_category=ResourceCategory.Value,
                                   map_start=hex(0x7f057fff))
            util.update_public_xml(res_xml_dir=self.DRAWABLE_XML_DIR,
                                   res_type='drawable', res_category=ResourceCategory.File,
                                   map_start=hex(0x7f067fff))
            util.update_public_xml(res_xml_dir=self.LAYOUT_XML_DIR,
                                   res_type='layout', res_category=ResourceCategory.File,
                                   map_start=hex(0x7f077fff))
            util.update_public_xml(res_xml_dir=self.LAYOUT_XML_DIR, res_type='id',
                                   res_category=ResourceCategory.Id,
                                   map_start=hex(0x7f087fff))


if __name__ == '__main__':
    util = AdServicesUiUtil()
    util.update_adservices_public_xml()