from flask import request
from flask_restful import marshal, reqparse
from werkzeug.exceptions import NotFound

import services.dataset_service
from controllers.service_api import api
from controllers.service_api.dataset.error import DatasetInUseError, DatasetNameDuplicateError
from controllers.service_api.wraps import DatasetApiResource
from core.model_runtime.entities.model_entities import ModelType
from core.provider_manager import ProviderManager
from fields.dataset_fields import dataset_detail_fields
from libs.login import current_user
from models.dataset import Dataset, DatasetPermissionEnum
from services.dataset_service import DatasetService


def _validate_name(name):
    if not name or len(name) < 1 or len(name) > 40:
        raise ValueError('Name must be between 1 to 40 characters.')
    return name


class DatasetListApi(DatasetApiResource):
    """Resource for datasets."""

    def get(self, tenant_id):
        """Resource for getting datasets."""

        page = request.args.get('page', default=1, type=int)
        limit = request.args.get('limit', default=20, type=int)
        provider = request.args.get('provider', default="vendor")
        search = request.args.get('keyword', default=None, type=str)
        tag_ids = request.args.getlist('tag_ids')

        datasets, total = DatasetService.get_datasets(page, limit, provider,
                                                      tenant_id, current_user, search, tag_ids)
        # check embedding setting
        provider_manager = ProviderManager()
        configurations = provider_manager.get_configurations(
            tenant_id=current_user.current_tenant_id
        )

        embedding_models = configurations.get_models(
            model_type=ModelType.TEXT_EMBEDDING,
            only_active=True
        )

        model_names = []
        for embedding_model in embedding_models:
            model_names.append(f"{embedding_model.model}:{embedding_model.provider.provider}")

        data = marshal(datasets, dataset_detail_fields)
        for item in data:
            if item['indexing_technique'] == 'high_quality':
                item_model = f"{item['embedding_model']}:{item['embedding_model_provider']}"
                if item_model in model_names:
                    item['embedding_available'] = True
                else:
                    item['embedding_available'] = False
            else:
                item['embedding_available'] = True
        response = {
            'data': data,
            'has_more': len(datasets) == limit,
            'limit': limit,
            'total': total,
            'page': page
        }
        return response, 200


    def post(self, tenant_id):
        """Resource for creating datasets."""
        parser = reqparse.RequestParser()
        parser.add_argument('name', nullable=False, required=True,
                            help='type is required. Name must be between 1 to 40 characters.',
                            type=_validate_name)
        parser.add_argument('indexing_technique', type=str, location='json',
                            choices=Dataset.INDEXING_TECHNIQUE_LIST,
                            help='Invalid indexing technique.')
        parser.add_argument('permission', type=str, location='json', choices=(
            DatasetPermissionEnum.ONLY_ME, DatasetPermissionEnum.ALL_TEAM, DatasetPermissionEnum.PARTIAL_TEAM), help='Invalid permission.', required=False, nullable=False)
        args = parser.parse_args()

        try:
            dataset = DatasetService.create_empty_dataset(
                tenant_id=tenant_id,
                name=args['name'],
                indexing_technique=args['indexing_technique'],
                account=current_user,
                permission=args['permission']
            )
        except services.errors.dataset.DatasetNameDuplicateError:
            raise DatasetNameDuplicateError()

        return marshal(dataset, dataset_detail_fields), 200

class DatasetApi(DatasetApiResource):
    """Resource for dataset."""

    def delete(self, _, dataset_id):
        """
        Deletes a dataset given its ID.

        Args:
            dataset_id (UUID): The ID of the dataset to be deleted.

        Returns:
            dict: A dictionary with a key 'result' and a value 'success' 
                  if the dataset was successfully deleted. Omitted in HTTP response.
            int: HTTP status code 204 indicating that the operation was successful.

        Raises:
            NotFound: If the dataset with the given ID does not exist.
        """

        dataset_id_str = str(dataset_id)

        try:
            if DatasetService.delete_dataset(dataset_id_str, current_user):
                return {'result': 'success'}, 204
            else:
                raise NotFound("Dataset not found.")
        except services.errors.dataset.DatasetInUseError:
            raise DatasetInUseError()

api.add_resource(DatasetListApi, '/datasets')
api.add_resource(DatasetApi, '/datasets/<uuid:dataset_id>')