from flask_login import current_user
from flask_restful import marshal, reqparse
from werkzeug.exceptions import NotFound

from controllers.service_api import api
from controllers.service_api.app.error import ProviderNotInitializeError
from controllers.service_api.wraps import DatasetApiResource, cloud_edition_billing_resource_check
from core.errors.error import LLMBadRequestError, ProviderTokenNotInitError
from core.model_manager import ModelManager
from core.model_runtime.entities.model_entities import ModelType
from extensions.ext_database import db
from fields.segment_fields import segment_fields
from models.dataset import Dataset, DocumentSegment
from services.dataset_service import DatasetService, DocumentService, SegmentService


class SegmentApi(DatasetApiResource):
    """Resource for segments."""

    @cloud_edition_billing_resource_check('vector_space', 'dataset')
    def post(self, tenant_id, dataset_id, document_id):
        """Create single segment."""
        # check dataset
        dataset_id = str(dataset_id)
        tenant_id = str(tenant_id)
        dataset = db.session.query(Dataset).filter(
            Dataset.tenant_id == tenant_id,
            Dataset.id == dataset_id
        ).first()
        if not dataset:
            raise NotFound('Dataset not found.')
        # check document
        document_id = str(document_id)
        document = DocumentService.get_document(dataset.id, document_id)
        if not document:
            raise NotFound('Document not found.')
        # check embedding model setting
        if dataset.indexing_technique == 'high_quality':
            try:
                model_manager = ModelManager()
                model_manager.get_model_instance(
                    tenant_id=current_user.current_tenant_id,
                    provider=dataset.embedding_model_provider,
                    model_type=ModelType.TEXT_EMBEDDING,
                    model=dataset.embedding_model
                )
            except LLMBadRequestError:
                raise ProviderNotInitializeError(
                    "No Embedding Model available. Please configure a valid provider "
                    "in the Settings -> Model Provider.")
            except ProviderTokenNotInitError as ex:
                raise ProviderNotInitializeError(ex.description)
        # validate args
        parser = reqparse.RequestParser()
        parser.add_argument('segments', type=list, required=False, nullable=True, location='json')
        args = parser.parse_args()
        for args_item in args['segments']:
            SegmentService.segment_create_args_validate(args_item, document)
        segments = SegmentService.multi_create_segment(args['segments'], document, dataset)
        return {
            'data': marshal(segments, segment_fields),
            'doc_form': document.doc_form
        }, 200

    def get(self, tenant_id, dataset_id, document_id):
        """Create single segment."""
        # check dataset
        dataset_id = str(dataset_id)
        tenant_id = str(tenant_id)
        dataset = db.session.query(Dataset).filter(
            Dataset.tenant_id == tenant_id,
            Dataset.id == dataset_id
        ).first()
        if not dataset:
            raise NotFound('Dataset not found.')
        # check document
        document_id = str(document_id)
        document = DocumentService.get_document(dataset.id, document_id)
        if not document:
            raise NotFound('Document not found.')
        # check embedding model setting
        if dataset.indexing_technique == 'high_quality':
            try:
                model_manager = ModelManager()
                model_manager.get_model_instance(
                    tenant_id=current_user.current_tenant_id,
                    provider=dataset.embedding_model_provider,
                    model_type=ModelType.TEXT_EMBEDDING,
                    model=dataset.embedding_model
                )
            except LLMBadRequestError:
                raise ProviderNotInitializeError(
                    "No Embedding Model available. Please configure a valid provider "
                    "in the Settings -> Model Provider.")
            except ProviderTokenNotInitError as ex:
                raise ProviderNotInitializeError(ex.description)

        parser = reqparse.RequestParser()
        parser.add_argument('status', type=str,
                            action='append', default=[], location='args')
        parser.add_argument('keyword', type=str, default=None, location='args')
        args = parser.parse_args()

        status_list = args['status']
        keyword = args['keyword']

        query = DocumentSegment.query.filter(
            DocumentSegment.document_id == str(document_id),
            DocumentSegment.tenant_id == current_user.current_tenant_id
        )

        if status_list:
            query = query.filter(DocumentSegment.status.in_(status_list))

        if keyword:
            query = query.where(DocumentSegment.content.ilike(f'%{keyword}%'))

        total = query.count()
        segments = query.order_by(DocumentSegment.position).all()
        return {
            'data': marshal(segments, segment_fields),
            'doc_form': document.doc_form,
            'total': total
        }, 200


class DatasetSegmentApi(DatasetApiResource):
    def delete(self, tenant_id, dataset_id, document_id, segment_id):
        # check dataset
        dataset_id = str(dataset_id)
        tenant_id = str(tenant_id)
        dataset = db.session.query(Dataset).filter(
            Dataset.tenant_id == tenant_id,
            Dataset.id == dataset_id
        ).first()
        if not dataset:
            raise NotFound('Dataset not found.')
        # check user's model setting
        DatasetService.check_dataset_model_setting(dataset)
        # check document
        document_id = str(document_id)
        document = DocumentService.get_document(dataset_id, document_id)
        if not document:
            raise NotFound('Document not found.')
        # check segment
        segment = DocumentSegment.query.filter(
            DocumentSegment.id == str(segment_id),
            DocumentSegment.tenant_id == current_user.current_tenant_id
        ).first()
        if not segment:
            raise NotFound('Segment not found.')
        SegmentService.delete_segment(segment, document, dataset)
        return {'result': 'success'}, 200

    @cloud_edition_billing_resource_check('vector_space', 'dataset')
    def post(self, tenant_id, dataset_id, document_id, segment_id):
        # check dataset
        dataset_id = str(dataset_id)
        tenant_id = str(tenant_id)
        dataset = db.session.query(Dataset).filter(
            Dataset.tenant_id == tenant_id,
            Dataset.id == dataset_id
        ).first()
        if not dataset:
            raise NotFound('Dataset not found.')
        # check user's model setting
        DatasetService.check_dataset_model_setting(dataset)
        # check document
        document_id = str(document_id)
        document = DocumentService.get_document(dataset_id, document_id)
        if not document:
            raise NotFound('Document not found.')
        if dataset.indexing_technique == 'high_quality':
            # check embedding model setting
            try:
                model_manager = ModelManager()
                model_manager.get_model_instance(
                    tenant_id=current_user.current_tenant_id,
                    provider=dataset.embedding_model_provider,
                    model_type=ModelType.TEXT_EMBEDDING,
                    model=dataset.embedding_model
                )
            except LLMBadRequestError:
                raise ProviderNotInitializeError(
                    "No Embedding Model available. Please configure a valid provider "
                    "in the Settings -> Model Provider.")
            except ProviderTokenNotInitError as ex:
                raise ProviderNotInitializeError(ex.description)
            # check segment
        segment_id = str(segment_id)
        segment = DocumentSegment.query.filter(
            DocumentSegment.id == str(segment_id),
            DocumentSegment.tenant_id == current_user.current_tenant_id
        ).first()
        if not segment:
            raise NotFound('Segment not found.')

        # validate args
        parser = reqparse.RequestParser()
        parser.add_argument('segments', type=dict, required=False, nullable=True, location='json')
        args = parser.parse_args()

        SegmentService.segment_create_args_validate(args['segments'], document)
        segment = SegmentService.update_segment(args['segments'], segment, document, dataset)
        return {
            'data': marshal(segment, segment_fields),
            'doc_form': document.doc_form
        }, 200


api.add_resource(SegmentApi, '/datasets/<uuid:dataset_id>/documents/<uuid:document_id>/segments')
api.add_resource(DatasetSegmentApi, '/datasets/<uuid:dataset_id>/documents/<uuid:document_id>/segments/<uuid:segment_id>')
