#!/usr/bin/env python3
#
# Copyright (C) 2022 Intel Corporation.
#
# SPDX-License-Identifier: BSD-3-Clause
#

"""
# XS2JS

Convert XML Schema To JSON Schema.

# Example Code

```python
import os
import json
from xs2js import XS2JS

schema_file = os.path.join('schema', 'config.xsd')
json_schema = XS2JS(schema_file).get_json_schema()
json_schema = json.dumps(json_schema, indent='\t')
output_file = 'schema.json'
open(output_file, 'w', encoding='utf-8').write(json_schema)
```

"""
__package__ = 'scenario_config.jsonschema'

import os
import json
import re

from collections import OrderedDict
from pathlib import Path

import xmltodict

try:
    from .document import ACRNDocumentStringConvertor
except ImportError:
    from document import ACRNDocumentStringConvertor


class XSTypes:
    def __init__(self, schema_dict):
        self.simple = self.load_type(schema_dict.get('xs:simpleType', []))
        self.complex = self.load_type(schema_dict.get('xs:complexType', []))

    @staticmethod
    def load_type(type_list):
        return {type_info['@name']: type_info for type_info in type_list}

    def get_type(self, type_name):
        if type_name in self.simple:
            return self.simple[type_name]
        elif type_name in self.complex:
            return self.complex[type_name]
        print(type_name)
        raise NotImplementedError


class XS:
    def __init__(self, schema_filename):
        self.schema = self.load_file(schema_filename)
        self.types = XSTypes(self.schema)

    @staticmethod
    def load_file(schema_filename):
        """load xml schema file and convert it to json dict"""
        schema = open(schema_filename, encoding='utf-8').read()

        # load schema_content
        schema_content = xmltodict.parse(schema)
        schema_content = schema_content['xs:schema']

        # handle xinclude element
        XS._handle_include(schema_filename, schema_content)

        return schema_content

    @staticmethod
    def _handle_include(schema_filename, schema_content):
        """parse xsd document xi:include tag and inject their content to origin document content"""
        if 'xi:include' in schema_content:
            for include in reversed(schema_content['xi:include']):
                source_path = os.path.join(os.path.dirname(schema_filename), include['@href'])
                include_content = XS.load_file(source_path)

                # marge data
                for attr in ['xs:simpleType', 'xs:complexType']:
                    if attr in include_content:
                        if attr not in schema_content:
                            schema_content[attr] = []

                        schema_content[attr] = [
                            *include_content[attr],
                            *schema_content[attr]
                        ]


class XS2JS:
    xst2jst_mapping = {
        'xs:string': 'string',
        'xs:integer': 'integer'
    }
    xsa2jsa_mapping = {
        'xs:minLength': ('minLength', int),
        'xs:maxLength': ('maxLength', int),
        'xs:pattern': ('pattern', lambda x: f"^{x}$"),
        'xs:minInclusive': ('minimum', int),
        'xs:maxInclusive': ('maximum', int),
    }

    def __init__(self, schema_filename, features=None):
        self.xs = XS(schema_filename)
        self.desc_conv = ACRNDocumentStringConvertor()
        if features is None:
            self.features = []
        else:
            if isinstance(features, list):
                self.features = features
            else:
                self.features = [features]

    def _get_definitions(self):
        """convert xml schema types to json schema definitions"""
        definitions = OrderedDict()

        # simple types
        for type_name, simple_type in self.xs.types.simple.items():
            definitions[type_name] = self.xso2jso(simple_type)

        # complex types
        for type_name, complex_type in self.xs.types.complex.items():
            definitions[type_name] = self.xse2jse(complex_type)

        return definitions

    def get_json_schema(self):
        json_schema = self.xse2jse(self.xs.schema)
        json_schema["additionalProperties"] = True
        json_schema['$schema'] = "http://json-schema.org/draft-07/schema"
        json_schema.move_to_end('$schema', False)
        json_schema["definitions"] = self._get_definitions()
        return json_schema

    def convert_widget_config(self, annotation, js_ele):
        if '@acrn:widget' in annotation:
            js_ele['ui:widget'] = annotation['@acrn:widget']
        if '@acrn:widget-options' in annotation:
            js_ele['ui:options'] = eval(f"{{{annotation['@acrn:widget-options']}}}")

    def convert_errormsg_config(self, annotation, js_ele):
        if '@acrn:errormsg' in annotation:
            opts = eval(f"{{{annotation['@acrn:errormsg']}}}")

            # An items of an error schema requires an "err:" prefix.
            keys = list(opts.keys())
            for key in keys:
                opts[f"err:{key}"] = opts.pop(key)

            js_ele.update(opts)

    def xst2jst(self, type_name) -> str:
        """convert xml schema type name to json schema type name"""
        if type_name in self.xst2jst_mapping:
            return self.xst2jst_mapping[type_name]
        print(type_name)
        raise NotImplementedError

    def xsa2jsa(self, restriction):
        """convert xml schema object attrs to json schema object attrs"""
        result = {}
        for key in restriction:
            if key in self.xsa2jsa_mapping:
                js_key, js_type = self.xsa2jsa_mapping[key]
                result[js_key] = js_type(restriction[key]['@value'])
        return result

    def xso2jso(self, obj, show_type_name=False) -> OrderedDict:
        """convert xml schema object to json schema object"""
        if 'xs:restriction' in obj:
            restriction = obj['xs:restriction']
            js_st = OrderedDict({"type": self.xst2jst(restriction['@base'])})
            if show_type_name:
                js_st['title'] = obj['@name']
                js_st.move_to_end('title', False)
            if 'xs:enumeration' in restriction:
                type_func = {"string": str, "integer": int}.get(js_st['type'], str)
                # enum
                enum = []
                for enum_element in restriction['xs:enumeration']:
                    enum.append(type_func(enum_element['@value']))
                js_st["enum"] = enum

                # enumNames
                if enum and '@acrn:title' in restriction['xs:enumeration'][0].get('xs:annotation', {}):
                    enum_names = []
                    for enum_element in restriction['xs:enumeration']:
                        if 'xs:annotation' in enum_element and '@acrn:title' in enum_element.get('xs:annotation', {}):
                            enum_names.append(enum_element['xs:annotation']['@acrn:title'])
                        else:
                            enum_name = enum_element['@value']
                            print('Warning!: enum element {} does not provide a enumName'.format(str(enum_element)))
                            enum_names.append(enum_name)
                    js_st["enumNames"] = enum_names

            # widget configs and error messages
            if 'xs:annotation' in obj:
                self.convert_widget_config(obj['xs:annotation'], js_st)
                self.convert_errormsg_config(obj['xs:annotation'], js_st)

            js_st.update(self.xsa2jsa(restriction))
            return js_st
        elif 'xs:union' in obj:
            member_types = obj['xs:union']['@memberTypes'].split(' ')
            member_js_objects = []
            for type_name in member_types:
                member_type = self.xs.types.get_type(type_name)
                member_js_objects.append(self.xso2jso(member_type, True))
            # Todo: union type refactor
            return OrderedDict({"anyOf": member_js_objects})
        print(obj)
        raise NotImplementedError

    def get_tester(self, element):
        if "@test" not in element:
            raise ValueError
        test_command = re.search(r'\.//(\S+)\s*=\s*[\'"](\S+)[\'"]', element['@test'])
        if not test_command:
            raise ValueError
        test_attr_name = test_command.group(1)
        test_attr_const = test_command.group(2)
        test_obj = {
            "if": {
                "properties": {
                    test_attr_name: {
                        "const": test_attr_const
                    }
                }
            },
            "then": True,
            "else": False
        }
        return test_obj

    def get_element_define(self, element):
        basic_define = {}
        if 'xs:simpleType' in element:
            basic_define = self.xso2jso(element['xs:simpleType'])
        elif '@type' in element:
            element_type = element['@type']
            if element_type in self.xst2jst_mapping:
                basic_define['type'] = self.xst2jst_mapping[element_type]
            else:
                basic_define["$ref"] = "#/definitions/%s" % element_type
        elif 'xs:complexType' in element:
            basic_define = self.xse2jse(element['xs:complexType'])
        elif 'xs:alternative' in element:
            possible_types = []
            for possible_type in element['xs:alternative']:
                temp_obj = self.get_element_define(possible_type)
                if '@test' in possible_type:
                    temp_obj.update(self.get_tester(possible_type))
                possible_types.append(temp_obj)

            basic_define = {'oneOf': possible_types}
        else:
            print(json.dumps(element, indent=2))
            raise NotImplementedError
        return basic_define

    def xse2jse(self, obj) -> OrderedDict:
        """convert xml schema elements to json schema elements"""
        properties = OrderedDict()
        required = []

        # get elements
        all_elements = self.get_elements(obj)

        for element in all_elements:
            name = element['@name']

            # get element basic define (basic/simple type? $ref?)

            basic_define = self.get_element_define(element)

            # build element json schema
            js_ele = OrderedDict(basic_define)

            # get default
            if '@default' in element:
                default = element['@default']
                if default.isdigit():
                    default = int(default)

                js_ele['default'] = default

            # is this element is required ?
            if '@minOccurs' in element:
                min_items = int(element['@minOccurs'])
                if min_items > 0:
                    required.append(name)
                if min_items > 1:
                    js_ele['minItems'] = min_items
            else:
                # by default, field is required
                required.append(name)

            if '@maxOccurs' in element:
                # ui:options seen at this moment are copied from the annotation of the type.
                possible_keys = ['type', '$ref', 'oneOf', 'ui:options', 'err:required', 'err:pattern']
                convert_to_items_success = False
                js_ele['items'] = {}
                for possible_key in possible_keys:
                    if possible_key not in js_ele:
                        continue
                    js_ele['items'][possible_key] = js_ele[possible_key]
                    del js_ele[possible_key]
                    convert_to_items_success = True

                if not convert_to_items_success:
                    raise NotImplementedError

                if element['@maxOccurs'] == "unbounded":
                    # unlimited, only set type = array
                    js_ele['type'] = 'array'
                else:
                    js_ele['type'] = 'array'
                    js_ele['maxItems'] = int(element['@maxOccurs'])

                if 'default' in js_ele:
                    js_ele['items']['default'] = js_ele['default']
                    del js_ele['default']

            # get description
            if 'xs:annotation' in element:
                # title
                js_ele['title'] = element['xs:annotation'].get('@acrn:title', name)

                # documentation
                documentation: str = element['xs:annotation'].get('xs:documentation', None)
                if documentation is None or documentation.strip() == '':
                    documentation = ''
                if documentation:
                    documentation = self.desc_conv.convert(documentation)
                js_ele['description'] = documentation

                # dynamic enum
                if '@acrn:options' in element['xs:annotation'] and 'dynamicEnum' in self.features:
                    dynamic_enum = {
                        'type': 'dynamicEnum',
                        'function': 'get_enum',
                        'source': 'board_xml',
                        'selector': element['xs:annotation']['@acrn:options'],
                        'sorted': element['xs:annotation'].get('@acrn:options-sorted-by', None)
                    }
                    # enum should be applied to array items instead of array itself
                    if 'items' in js_ele:
                        js_ele['items']['enum'] = dynamic_enum
                    else:
                        js_ele['enum'] = dynamic_enum

                # widget and its options
                self.convert_widget_config(element['xs:annotation'], js_ele)

                # Error messages
                self.convert_errormsg_config(element['xs:annotation'], js_ele)

            properties[name] = js_ele

        # build result
        result = OrderedDict({"type": "object"})

        if required:
            result['required'] = required

        if properties:
            result["properties"] = properties

        return result

    @staticmethod
    def get_elements(obj):
        """get elements from xml schema object"""
        all_elements = []
        if 'xs:element' in obj:
            elements = obj['xs:element']
            if not isinstance(elements, list):
                elements = [elements]
            all_elements.extend(elements)
        for attr in ['xs:sequence', 'xs:all']:
            if attr in obj:
                elements = obj[attr]['xs:element']
                if not isinstance(elements, list):
                    elements = [elements]
                all_elements.extend(elements)
        return all_elements


def main():
    # find acrn-hypervisor/misc/config_tools folder
    config_tools = Path(__file__).absolute()
    while config_tools.name != "config_tools":
        config_tools = config_tools.parent

    schema_file = config_tools / 'schema' / 'sliced.xsd'
    json_schema_file = config_tools / 'configurator' / 'packages' / 'configurator' / 'build' / 'assets' / 'scenario.json'
    json_schema_file.parent.mkdir(parents=True, exist_ok=True)

    # Convert XSD to JSON Schema
    # Todo: turn off it
    stand_json_schema = False
    features = []
    if not stand_json_schema:
        features.append('dynamicEnum')
    json_schema = XS2JS(schema_file, features).get_json_schema()
    json_schema = json.dumps(json_schema, indent='\t')

    # Write file and print successful message
    with open(json_schema_file, 'w', encoding='utf-8') as f:
        f.write(json_schema)
    print("File %s Convert Success. JSON Schema Write To: %s" % (repr(schema_file), repr(json_schema_file)))


if __name__ == '__main__':
    main()