// Copyright 2018 Vulcanize
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package factories

import (
	"github.com/ethereum/go-ethereum/core/types"
	log "github.com/sirupsen/logrus"

	"github.com/vulcanize/vulcanizedb/pkg/core"
	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
)

type Transformer struct {
	Config     shared.TransformerConfig
	Converter  Converter
	Repository Repository
}

func (transformer Transformer) NewTransformer(db *postgres.DB) shared.Transformer {
	transformer.Repository.SetDB(db)
	return transformer
}

func (transformer Transformer) Execute(logs []types.Log, header core.Header) error {
	transformerName := transformer.Config.TransformerName
	config := transformer.Config

	if len(logs) < 1 {
		err := transformer.Repository.MarkHeaderChecked(header.Id)
		if err != nil {
			log.Printf("Error marking header as checked in %v: %v", transformerName, err)
			return err
		}
	}

	entities, err := transformer.Converter.ToEntities(config.ContractAbi, logs)
	if err != nil {
		log.Printf("Error converting logs to entities in %v: %v", transformerName, err)
		return err
	}

	models, err := transformer.Converter.ToModels(entities)
	if err != nil {
		log.Printf("Error converting entities to models in %v: %v", transformerName, err)
		return err
	}

	err = transformer.Repository.Create(header.Id, models)
	if err != nil {
		log.Printf("Error persisting %v record: %v", transformerName, err)
		return err
	}

	return nil
}

func (transformer Transformer) Name() string {
	return transformer.Config.TransformerName
}