// 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 frob_test

import (
	"database/sql"

	. "github.com/onsi/ginkgo"
	. "github.com/onsi/gomega"

	"github.com/vulcanize/vulcanizedb/pkg/core"
	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres/repositories"
	"github.com/vulcanize/vulcanizedb/pkg/transformers/frob"
	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
	"github.com/vulcanize/vulcanizedb/test_config"
)

var _ = Describe("Frob repository", func() {
	Describe("Create", func() {
		It("adds a frob", func() {
			node := core.Node{}
			db := test_config.NewTestDB(node)
			test_config.CleanTestDB(db)
			headerRepository := repositories.NewHeaderRepository(db)
			headerID, err := headerRepository.CreateOrUpdateHeader(core.Header{})
			Expect(err).NotTo(HaveOccurred())
			frobRepository := frob.NewFrobRepository(db)

			err = frobRepository.Create(headerID, 123, test_data.FrobModel)

			Expect(err).NotTo(HaveOccurred())
			var dbFrob frob.FrobModel
			err = db.Get(&dbFrob, `SELECT art, dart, dink, iart, ilk, ink, lad FROM maker.frob WHERE header_id = $1`, headerID)
			Expect(err).NotTo(HaveOccurred())
			Expect(dbFrob).To(Equal(test_data.FrobModel))
		})

		It("does not duplicate frob events", func() {
			node := core.Node{}
			db := test_config.NewTestDB(node)
			test_config.CleanTestDB(db)
			headerRepository := repositories.NewHeaderRepository(db)
			headerID, err := headerRepository.CreateOrUpdateHeader(core.Header{})
			Expect(err).NotTo(HaveOccurred())
			frobRepository := frob.NewFrobRepository(db)
			err = frobRepository.Create(headerID, 123, test_data.FrobModel)
			Expect(err).NotTo(HaveOccurred())

			err = frobRepository.Create(headerID, 123, test_data.FrobModel)

			Expect(err).To(HaveOccurred())
			Expect(err.Error()).To(ContainSubstring("pq: duplicate key value violates unique constraint"))
		})

		It("removes frob if corresponding header is deleted", func() {
			node := core.Node{}
			db := test_config.NewTestDB(node)
			test_config.CleanTestDB(db)
			headerRepository := repositories.NewHeaderRepository(db)
			headerID, err := headerRepository.CreateOrUpdateHeader(core.Header{})
			Expect(err).NotTo(HaveOccurred())
			frobRepository := frob.NewFrobRepository(db)
			err = frobRepository.Create(headerID, 123, test_data.FrobModel)
			Expect(err).NotTo(HaveOccurred())

			_, err = db.Exec(`DELETE FROM headers WHERE id = $1`, headerID)

			Expect(err).NotTo(HaveOccurred())
			var dbFrob frob.FrobModel
			err = db.Get(&dbFrob, `SELECT art, iart, ilk, ink, lad FROM maker.frob WHERE header_id = $1`, headerID)
			Expect(err).To(HaveOccurred())
			Expect(err).To(MatchError(sql.ErrNoRows))
		})
	})

	Describe("MissingHeaders", func() {
		It("returns headers with no associated frob event", func() {
			node := core.Node{}
			db := test_config.NewTestDB(node)
			test_config.CleanTestDB(db)
			headerRepository := repositories.NewHeaderRepository(db)
			startingBlockNumber := int64(1)
			frobBlockNumber := int64(2)
			endingBlockNumber := int64(3)
			blockNumbers := []int64{startingBlockNumber, frobBlockNumber, endingBlockNumber, endingBlockNumber + 1}
			var headerIDs []int64
			for _, n := range blockNumbers {
				headerID, err := headerRepository.CreateOrUpdateHeader(core.Header{BlockNumber: n})
				headerIDs = append(headerIDs, headerID)
				Expect(err).NotTo(HaveOccurred())
			}
			frobRepository := frob.NewFrobRepository(db)
			err := frobRepository.Create(headerIDs[1], 123, test_data.FrobModel)
			Expect(err).NotTo(HaveOccurred())

			headers, err := frobRepository.MissingHeaders(startingBlockNumber, endingBlockNumber)

			Expect(err).NotTo(HaveOccurred())
			Expect(len(headers)).To(Equal(2))
			Expect(headers[0].BlockNumber).To(Or(Equal(startingBlockNumber), Equal(endingBlockNumber)))
			Expect(headers[1].BlockNumber).To(Or(Equal(startingBlockNumber), Equal(endingBlockNumber)))
		})

		It("only returns headers associated with the current node", func() {
			nodeOne := core.Node{}
			db := test_config.NewTestDB(nodeOne)
			test_config.CleanTestDB(db)
			blockNumbers := []int64{1, 2, 3}
			headerRepository := repositories.NewHeaderRepository(db)
			nodeTwo := core.Node{ID: "second"}
			dbTwo := test_config.NewTestDB(nodeTwo)
			headerRepositoryTwo := repositories.NewHeaderRepository(dbTwo)
			var headerIDs []int64
			for _, n := range blockNumbers {
				headerID, err := headerRepository.CreateOrUpdateHeader(core.Header{BlockNumber: n})
				Expect(err).NotTo(HaveOccurred())
				headerIDs = append(headerIDs, headerID)
				_, err = headerRepositoryTwo.CreateOrUpdateHeader(core.Header{BlockNumber: n})
				Expect(err).NotTo(HaveOccurred())
			}
			frobRepository := frob.NewFrobRepository(db)
			frobRepositoryTwo := frob.NewFrobRepository(dbTwo)
			err := frobRepository.Create(headerIDs[0], 0, test_data.FrobModel)
			Expect(err).NotTo(HaveOccurred())

			nodeOneMissingHeaders, err := frobRepository.MissingHeaders(blockNumbers[0], blockNumbers[len(blockNumbers)-1])
			Expect(err).NotTo(HaveOccurred())
			Expect(len(nodeOneMissingHeaders)).To(Equal(len(blockNumbers) - 1))

			nodeTwoMissingHeaders, err := frobRepositoryTwo.MissingHeaders(blockNumbers[0], blockNumbers[len(blockNumbers)-1])
			Expect(err).NotTo(HaveOccurred())
			Expect(len(nodeTwoMissingHeaders)).To(Equal(len(blockNumbers)))
		})
	})
})