#!/usr/bin/env python3
from flask import jsonify, abort, request, url_for
from flask_classful import FlaskView, route
from marshmallow import ValidationError

from utils import json_required

from model import db, AIModel, AIModelType, Default

from schemas import AIModelSchema, DefaultSchema

import opentracing


class RootView(FlaskView):
    route_base = '/'

    aimodels_schema = AIModelSchema(many=True, exclude=['timestamp', 'details', 'target_class_name'])
    aimodel_schema = AIModelSchema(many=False)

    default_schema = DefaultSchema(many=False)

    ## Shared stuff goes here

    def index(self):
        with opentracing.tracer.start_active_span('sqlalchemy.select'):
            models = AIModel.query.all()

        return jsonify(self.aimodels_schema.dump(models))

    @route('/<type_>')
    def get_models(self, type_: str):
        try:
            aimodel_type = AIModelType[type_]
        except KeyError:
            return abort(404, "Unknown type")

        with opentracing.tracer.start_active_span('sqlalchemy.select', tags={"aimodel_type": aimodel_type}):
            models = AIModel.query.filter_by(type=aimodel_type).all()

        return jsonify(self.aimodels_schema.dump(models)), 200

    @route('/<type_>/<id_>')
    def get_model(self, type_: str, id_: str):
        try:
            aimodel_type = AIModelType[type_]
        except KeyError:
            return abort(404, "Unknown type")

        with opentracing.tracer.start_active_span(
                'sqlalchemy.select',
                tags={"aimodel_type": aimodel_type, "id": id_}
        ):
            if id_ == "$default":

                default = Default.query.filter_by(type=aimodel_type).first_or_404()
                m = default.aimodel
            else:
                m = AIModel.query.filter_by(type=aimodel_type, id=id_).first_or_404()

        # Append download links
        with opentracing.tracer.start_active_span(
                'compileResponseDict',
                tags={"id": id_}
        ):
            details = self.aimodel_schema.dump(m)

            # Vagy ez, vagy visszateszem a saját view-jébe és duplikálva lesz az egész
            if aimodel_type == AIModelType.cnn:
                details.update({
                    "files": {
                        "model": url_for("CNNView:get_file", id_=m.id),
                        "weights": url_for("CNNView:get_file", id_=m.id, weights=''),
                    }
                })
            elif aimodel_type == AIModelType.svm:
                details.update({
                    "files": {
                        "model": url_for("SVMView:get_file", id_=m.id),
                        "means": url_for("SVMView:get_file", id_=m.id, means=''),
                    }
                })

        return jsonify(details)

    @json_required
    @route('/<type_>/$default', methods=['PUT'])
    def put_default(self, type_: str):

        try:
            aimodel_type = AIModelType[type_]
        except KeyError:
            return abort(404, "Unknown type")

        try:
            req = self.default_schema.load(request.json)
        except ValidationError as e:
            return abort(400, str(e))

        with opentracing.tracer.start_active_span('sqlalchemy.select'):
            m = AIModel.query.filter_by(type=aimodel_type, id=req['id']).first_or_404()

        with opentracing.tracer.start_active_span('sqlalchemy.delete'):
            Default.query.filter_by(type=aimodel_type).delete()

        with opentracing.tracer.start_active_span('sqlalchemy.create'):
            new_default = Default(type=aimodel_type, aimodel=m)
            db.session.add(new_default)

        with opentracing.tracer.start_active_span('sqlalchemy.commit'):
            db.session.commit()

        return '', 204