serializers.py

from pydash import get
from rest_framework.fields import CharField, JSONField, IntegerField, DateTimeField, ListField, SerializerMethodField, \
    FloatField
from rest_framework.serializers import ModelSerializer

from core.common.constants import MAPPING_LOOKUP_CONCEPTS, MAPPING_LOOKUP_SOURCES, MAPPING_LOOKUP_FROM_CONCEPT, \
    MAPPING_LOOKUP_TO_CONCEPT, MAPPING_LOOKUP_FROM_SOURCE, MAPPING_LOOKUP_TO_SOURCE, INCLUDE_EXTRAS_PARAM, \
    INCLUDE_SOURCE_VERSIONS, INCLUDE_COLLECTION_VERSIONS, INCLUDE_VERBOSE_REFERENCES
from core.common.fields import EncodedDecodedCharField
from core.common.serializers import AbstractResourceSerializer
from core.common.utils import get_truthy_values
from core.concepts.serializers import ConceptDetailSerializer
from core.mappings.models import Mapping
from core.sources.serializers import SourceListSerializer, SourceDetailSerializer


TRUTHY = get_truthy_values()


class AbstractMappingSerializer(AbstractResourceSerializer):
    from_concept = SerializerMethodField()
    to_concept = SerializerMethodField()
    from_source = SourceListSerializer()
    to_source = SourceListSerializer()
    references = SerializerMethodField()

    class Meta:
        abstract = True
        fields = AbstractResourceSerializer.Meta.fields + (
            'search_meta', 'from_concept', 'to_concept', 'from_source', 'to_source', 'extras', 'references'
        )

    def __init__(self, *args, **kwargs):
        request = get(kwargs, 'context.request')
        params = get(request, 'query_params')
        self.query_params = params.dict() if params else {}
        self.include_from_source = self.query_params.get(MAPPING_LOOKUP_FROM_SOURCE) in TRUTHY
        self.include_to_source = self.query_params.get(MAPPING_LOOKUP_TO_SOURCE) in TRUTHY
        self.include_sources = self.query_params.get(MAPPING_LOOKUP_SOURCES) in TRUTHY
        self.include_from_concept = self.query_params.get(MAPPING_LOOKUP_FROM_CONCEPT) in TRUTHY
        self.include_to_concept = self.query_params.get(MAPPING_LOOKUP_TO_CONCEPT) in TRUTHY
        self.include_concepts = self.query_params.get(MAPPING_LOOKUP_CONCEPTS) in TRUTHY
        self.include_extras = self.query_params.get(INCLUDE_EXTRAS_PARAM) in TRUTHY
        self.include_verbose_references = self.query_params.get(INCLUDE_VERBOSE_REFERENCES) in TRUTHY
        if not self.include_concepts:
            if not self.include_from_concept:
                self.fields.pop('from_concept')
            if not self.include_to_concept:
                self.fields.pop('to_concept')

        if not self.include_sources:
            if not self.include_from_source:
                self.fields.pop('from_source')
            if not self.include_to_source:
                self.fields.pop('to_source')

        if not self.include_extras and self.__class__.__name__ in [
                'MappingListSerializer', 'MappingVersionListSerializer', 'MappingMinimalSerializer'
        ]:
            self.fields.pop('extras', None)

        if not get(request, 'instance'):
            self.fields.pop('references', None)

        super().__init__(*args, **kwargs)

    def get_references(self, obj):
        collection = get(self, 'context.request.instance')
        if collection:
            if self.include_verbose_references:
                from core.collections.serializers import CollectionReferenceSerializer
                return CollectionReferenceSerializer(obj.collection_references(collection), many=True).data
            return obj.collection_references_uris(collection)
        return None

    def get_concept_serializer(self):
        request = get(self.context, 'request')
        params = get(request, 'query_params')
        is_brief = params.get('brief') in TRUTHY
        is_verbose = params.get('verbose') in TRUTHY
        from core.concepts.models import Concept
        return Concept.get_serializer_class(verbose=is_verbose, brief=is_brief)

    def get_from_concept(self, obj):
        if self.include_from_concept or self.include_concepts:
            return self.get_concept_serializer()(obj.from_concept, context=self.context).data
        return None

    def get_to_concept(self, obj):
        if self.include_to_concept or self.include_concepts:
            return self.get_concept_serializer()(obj.to_concept, context=self.context).data
        return None


class MappingListSerializer(AbstractMappingSerializer):
    type = CharField(source='resource_type', read_only=True)
    id = CharField(source='mnemonic', required=False)
    uuid = CharField(source='id', read_only=True)
    source = CharField(source='parent_resource', read_only=True)
    owner = CharField(source='owner_name', read_only=True)
    update_comment = CharField(source='comment', required=False, allow_null=True, allow_blank=True)
    url = CharField(required=False, source='versioned_object_url')
    version = CharField(read_only=True)
    version_created_on = DateTimeField(source='created_at', read_only=True)
    from_concept_name_resolved = CharField(source='from_concept.display_name', read_only=True)
    to_concept_name_resolved = CharField(source='to_concept.display_name', read_only=True)
    to_concept_code = EncodedDecodedCharField(required=False)
    from_concept_code = EncodedDecodedCharField(required=False)
    sort_weight = FloatField(required=False, allow_null=True)
    latest_source_version = CharField(
        source='latest_source_version.version', allow_null=True, allow_blank=True, read_only=True, required=False)

    class Meta:
        model = Mapping
        fields = AbstractMappingSerializer.Meta.fields + (
            'external_id', 'retired', 'map_type', 'source', 'owner', 'owner_type',
            'from_concept_code', 'from_concept_name', 'from_concept_url',
            'to_concept_code', 'to_concept_name', 'to_concept_url',
            'from_source_owner', 'from_source_owner_type', 'from_source_url', 'from_source_name',
            'to_source_owner', 'to_source_owner_type', 'to_source_url', 'to_source_name',
            'url', 'version', 'id', 'versioned_object_id', 'versioned_object_url',
            'is_latest_version', 'update_comment', 'version_url', 'uuid', 'version_created_on',
            'from_source_version', 'to_source_version', 'from_concept_name_resolved',
            'to_concept_name_resolved', 'type', 'sort_weight', 'latest_source_version'
        )


class MappingVersionListSerializer(MappingListSerializer):
    previous_version_url = CharField(read_only=True, source='prev_version_uri')
    source_versions = ListField(read_only=True)
    collection_versions = ListField(read_only=True)
    checksums = SerializerMethodField()

    class Meta:
        model = Mapping
        fields = MappingListSerializer.Meta.fields + (
            'previous_version_url', 'source_versions', 'collection_versions', 'checksums'
        )

    def __init__(self, *args, **kwargs):
        params = get(kwargs, 'context.request.query_params')
        self.query_params = params.dict() if params else {}
        self.include_source_versions = self.query_params.get(INCLUDE_SOURCE_VERSIONS) in TRUTHY
        self.include_collection_versions = self.query_params.get(INCLUDE_COLLECTION_VERSIONS) in TRUTHY

        if not self.include_source_versions:
            self.fields.pop('source_versions', None)
        if not self.include_collection_versions:
            self.fields.pop('collection_versions', None)

        super().__init__(*args, **kwargs)

    @staticmethod
    def get_checksums(obj):
        return obj.get_checksums(queue=True)


class MappingMinimalSerializer(AbstractMappingSerializer):
    id = CharField(source='mnemonic', read_only=True)
    type = CharField(source='resource_type', read_only=True)
    url = CharField(source='uri', read_only=True)
    from_concept_code = EncodedDecodedCharField()
    to_concept_code = EncodedDecodedCharField()
    cascade_target_concept_code = EncodedDecodedCharField(source='to_concept_code')
    cascade_target_concept_name = SerializerMethodField()
    cascade_target_concept_url = CharField(source='to_concept_url')
    cascade_target_source_name = CharField(source='to_source_name', allow_blank=True, allow_null=True)
    cascade_target_source_owner = CharField(source='to_source_owner', allow_blank=True, allow_null=True)

    class Meta:
        model = Mapping
        fields = AbstractMappingSerializer.Meta.fields + (
            'id', 'type', 'map_type', 'url', 'version_url', 'to_concept_code', 'to_concept_url',
            'cascade_target_concept_code', 'cascade_target_concept_url', 'cascade_target_source_owner',
            'cascade_target_source_name', 'cascade_target_concept_name', 'retired', 'sort_weight',
            'from_concept_code'
        )

    @staticmethod
    def get_cascade_target_concept_name(obj):
        return obj.to_concept_name or get(obj, 'to_concept.display_name')


class MappingReverseMinimalSerializer(ModelSerializer):
    id = CharField(source='mnemonic', read_only=True)
    type = CharField(source='resource_type', read_only=True)
    url = CharField(source='uri', read_only=True)
    from_concept_code = EncodedDecodedCharField()
    cascade_target_concept_code = EncodedDecodedCharField(source='from_concept_code')
    cascade_target_concept_name = SerializerMethodField()
    cascade_target_concept_url = CharField(source='from_concept_url')
    cascade_target_source_name = CharField(source='from_source_name', allow_blank=True, allow_null=True)
    cascade_target_source_owner = CharField(source='from_source_owner', allow_blank=True, allow_null=True)

    class Meta:
        model = Mapping
        fields = (
            'id', 'type', 'map_type', 'url', 'version_url', 'from_concept_code', 'from_concept_url',
            'cascade_target_concept_code', 'cascade_target_concept_url', 'cascade_target_source_owner',
            'cascade_target_source_name', 'cascade_target_concept_name', 'retired', 'sort_weight'
        )

    @staticmethod
    def get_cascade_target_concept_name(obj):
        return obj.from_concept_name or get(obj, 'from_concept.display_name')


class MappingDetailSerializer(MappingListSerializer):
    type = CharField(source='resource_type', read_only=True)
    uuid = CharField(source='id', read_only=True)
    extras = JSONField(required=False, allow_null=True)
    created_by = CharField(source='created_by.username', read_only=True)
    updated_by = CharField(source='created_by.username', read_only=True)
    parent_id = IntegerField(required=True, write_only=True)
    map_type = CharField(required=True)
    to_concept_url = CharField(required=False)
    from_concept_url = CharField(required=False)
    from_concept = ConceptDetailSerializer()
    to_concept = ConceptDetailSerializer()
    from_source = SourceDetailSerializer()
    to_source = SourceDetailSerializer()
    created_on = DateTimeField(source='created_at', read_only=True)
    updated_on = DateTimeField(source='updated_at', read_only=True)
    checksums = SerializerMethodField()
    latest_source_version = CharField(
        source='latest_source_version.version', allow_null=True, allow_blank=True, read_only=True, required=False)

    class Meta:
        model = Mapping
        fields = MappingListSerializer.Meta.fields + (
            'type', 'uuid', 'extras', 'created_on', 'updated_on', 'created_by',
            'updated_by', 'parent_id', 'public_can_view', 'checksums', 'latest_source_version'
        )

    def create(self, validated_data):
        mapping = Mapping.persist_new(data=validated_data, user=self.context.get('request').user)
        if mapping.errors:
            self._errors.update(mapping.errors)
        return mapping

    def update(self, instance, validated_data):
        errors = Mapping.create_new_version_for(instance, validated_data, self.context.get('request').user)
        if errors:
            self._errors.update(errors)
        return instance

    @staticmethod
    def get_checksums(obj):
        return obj.get_checksums(queue=True)


class MappingVersionDetailSerializer(MappingDetailSerializer):
    previous_version_url = CharField(read_only=True, source='prev_version_uri')
    source_versions = ListField(read_only=True)
    collection_versions = ListField(read_only=True)

    class Meta:
        model = Mapping
        fields = MappingDetailSerializer.Meta.fields + (
            'previous_version_url', 'source_versions', 'collection_versions',
        )