import flask_restful
from flask_login import current_user
from flask_restful import Resource, fields, marshal_with
from werkzeug.exceptions import Forbidden

from extensions.ext_database import db
from libs.helper import TimestampField
from libs.login import login_required
from models.dataset import Dataset
from models.model import ApiToken, App

from . import api
from .setup import setup_required
from .wraps import account_initialization_required

api_key_fields = {
    'id': fields.String,
    'type': fields.String,
    'token': fields.String,
    'last_used_at': TimestampField,
    'created_at': TimestampField
}

api_key_list = {
    'data': fields.List(fields.Nested(api_key_fields), attribute="items")
}


def _get_resource(resource_id, tenant_id, resource_model):
    resource = resource_model.query.filter_by(
        id=resource_id, tenant_id=tenant_id
    ).first()

    if resource is None:
        flask_restful.abort(
            404, message=f"{resource_model.__name__} not found.")

    return resource


class BaseApiKeyListResource(Resource):
    method_decorators = [account_initialization_required, login_required, setup_required]

    resource_type = None
    resource_model = None
    resource_id_field = None
    token_prefix = None
    max_keys = 10

    @marshal_with(api_key_list)
    def get(self, resource_id):
        resource_id = str(resource_id)
        _get_resource(resource_id, current_user.current_tenant_id,
                      self.resource_model)
        keys = db.session.query(ApiToken). \
            filter(ApiToken.type == self.resource_type, getattr(ApiToken, self.resource_id_field) == resource_id). \
            all()
        return {"items": keys}

    @marshal_with(api_key_fields)
    def post(self, resource_id):
        resource_id = str(resource_id)
        _get_resource(resource_id, current_user.current_tenant_id,
                      self.resource_model)
        if not current_user.is_admin_or_owner:
            raise Forbidden()

        current_key_count = db.session.query(ApiToken). \
            filter(ApiToken.type == self.resource_type, getattr(ApiToken, self.resource_id_field) == resource_id). \
            count()

        if current_key_count >= self.max_keys:
            flask_restful.abort(
                400,
                message=f"Cannot create more than {self.max_keys} API keys for this resource type.",
                code='max_keys_exceeded'
            )

        key = ApiToken.generate_api_key(self.token_prefix, 24)
        api_token = ApiToken()
        setattr(api_token, self.resource_id_field, resource_id)
        api_token.tenant_id = current_user.current_tenant_id
        api_token.token = key
        api_token.type = self.resource_type
        db.session.add(api_token)
        db.session.commit()
        return api_token, 201


class BaseApiKeyResource(Resource):
    method_decorators = [account_initialization_required, login_required, setup_required]

    resource_type = None
    resource_model = None
    resource_id_field = None

    def delete(self, resource_id, api_key_id):
        resource_id = str(resource_id)
        api_key_id = str(api_key_id)
        _get_resource(resource_id, current_user.current_tenant_id,
                      self.resource_model)

        # The role of the current user in the ta table must be admin or owner
        if not current_user.is_admin_or_owner:
            raise Forbidden()

        key = db.session.query(ApiToken). \
            filter(getattr(ApiToken, self.resource_id_field) == resource_id, ApiToken.type == self.resource_type, ApiToken.id == api_key_id). \
            first()

        if key is None:
            flask_restful.abort(404, message='API key not found')

        db.session.query(ApiToken).filter(ApiToken.id == api_key_id).delete()
        db.session.commit()

        return {'result': 'success'}, 204


class AppApiKeyListResource(BaseApiKeyListResource):

    def after_request(self, resp):
        resp.headers['Access-Control-Allow-Origin'] = '*'
        resp.headers['Access-Control-Allow-Credentials'] = 'true'
        return resp

    resource_type = 'app'
    resource_model = App
    resource_id_field = 'app_id'
    token_prefix = 'app-'


class AppApiKeyResource(BaseApiKeyResource):

    def after_request(self, resp):
        resp.headers['Access-Control-Allow-Origin'] = '*'
        resp.headers['Access-Control-Allow-Credentials'] = 'true'
        return resp

    resource_type = 'app'
    resource_model = App
    resource_id_field = 'app_id'


class DatasetApiKeyListResource(BaseApiKeyListResource):

    def after_request(self, resp):
        resp.headers['Access-Control-Allow-Origin'] = '*'
        resp.headers['Access-Control-Allow-Credentials'] = 'true'
        return resp

    resource_type = 'dataset'
    resource_model = Dataset
    resource_id_field = 'dataset_id'
    token_prefix = 'ds-'


class DatasetApiKeyResource(BaseApiKeyResource):

    def after_request(self, resp):
        resp.headers['Access-Control-Allow-Origin'] = '*'
        resp.headers['Access-Control-Allow-Credentials'] = 'true'
        return resp
    resource_type = 'dataset'
    resource_model = Dataset
    resource_id_field = 'dataset_id'


api.add_resource(AppApiKeyListResource, '/apps/<uuid:resource_id>/api-keys')
api.add_resource(AppApiKeyResource,
                 '/apps/<uuid:resource_id>/api-keys/<uuid:api_key_id>')
api.add_resource(DatasetApiKeyListResource,
                 '/datasets/<uuid:resource_id>/api-keys')
api.add_resource(DatasetApiKeyResource,
                 '/datasets/<uuid:resource_id>/api-keys/<uuid:api_key_id>')