from flask_restful import fields, marshal_with, reqparse
from flask_restful.inputs import int_range
from werkzeug.exceptions import NotFound

from controllers.web import api
from controllers.web.error import NotCompletionAppError
from controllers.web.wraps import WebApiResource
from fields.conversation_fields import message_file_fields
from libs.helper import TimestampField, uuid_value
from services.errors.message import MessageNotExistsError
from services.saved_message_service import SavedMessageService

feedback_fields = {
    'rating': fields.String
}

message_fields = {
    'id': fields.String,
    'inputs': fields.Raw,
    'query': fields.String,
    'answer': fields.String,
    'message_files': fields.List(fields.Nested(message_file_fields), attribute='files'),
    'feedback': fields.Nested(feedback_fields, attribute='user_feedback', allow_null=True),
    'created_at': TimestampField
}


class SavedMessageListApi(WebApiResource):
    saved_message_infinite_scroll_pagination_fields = {
        'limit': fields.Integer,
        'has_more': fields.Boolean,
        'data': fields.List(fields.Nested(message_fields))
    }

    @marshal_with(saved_message_infinite_scroll_pagination_fields)
    def get(self, app_model, end_user):
        if app_model.mode != 'completion':
            raise NotCompletionAppError()

        parser = reqparse.RequestParser()
        parser.add_argument('last_id', type=uuid_value, location='args')
        parser.add_argument('limit', type=int_range(1, 100), required=False, default=20, location='args')
        args = parser.parse_args()

        return SavedMessageService.pagination_by_last_id(app_model, end_user, args['last_id'], args['limit'])

    def post(self, app_model, end_user):
        if app_model.mode != 'completion':
            raise NotCompletionAppError()

        parser = reqparse.RequestParser()
        parser.add_argument('message_id', type=uuid_value, required=True, location='json')
        args = parser.parse_args()

        try:
            SavedMessageService.save(app_model, end_user, args['message_id'])
        except MessageNotExistsError:
            raise NotFound("Message Not Exists.")

        return {'result': 'success'}


class SavedMessageApi(WebApiResource):
    def delete(self, app_model, end_user, message_id):
        message_id = str(message_id)

        if app_model.mode != 'completion':
            raise NotCompletionAppError()

        SavedMessageService.delete(app_model, end_user, message_id)

        return {'result': 'success'}


api.add_resource(SavedMessageListApi, '/saved-messages')
api.add_resource(SavedMessageApi, '/saved-messages/<uuid:message_id>')