// 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"
	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres/repositories"
	"github.com/vulcanize/vulcanizedb/pkg/fakes"
	"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() {
	var (
		db               *postgres.DB
		frobRepository   frob.Repository
		err              error
		headerRepository datastore.HeaderRepository
	)

	BeforeEach(func() {
		db = test_config.NewTestDB(core.Node{})
		test_config.CleanTestDB(db)
		headerRepository = repositories.NewHeaderRepository(db)
		frobRepository = frob.NewFrobRepository(db)
	})

	Describe("Create", func() {
		var headerID int64

		BeforeEach(func() {
			headerID, err = headerRepository.CreateOrUpdateHeader(fakes.FakeHeader)
			Expect(err).NotTo(HaveOccurred())
		})

		It("adds a frob", func() {
			err = frobRepository.Create(headerID, []frob.FrobModel{test_data.FrobModel})

			Expect(err).NotTo(HaveOccurred())
			var dbFrob frob.FrobModel
			err = db.Get(&dbFrob, `SELECT art, dart, dink, iart, ilk, ink, urn, log_idx, tx_idx, raw_log FROM maker.frob WHERE header_id = $1`, headerID)
			Expect(err).NotTo(HaveOccurred())
			Expect(dbFrob.Ilk).To(Equal(test_data.FrobModel.Ilk))
			Expect(dbFrob.Urn).To(Equal(test_data.FrobModel.Urn))
			Expect(dbFrob.Ink).To(Equal(test_data.FrobModel.Ink))
			Expect(dbFrob.Art).To(Equal(test_data.FrobModel.Art))
			Expect(dbFrob.Dink).To(Equal(test_data.FrobModel.Dink))
			Expect(dbFrob.Dart).To(Equal(test_data.FrobModel.Dart))
			Expect(dbFrob.IArt).To(Equal(test_data.FrobModel.IArt))
			Expect(dbFrob.LogIndex).To(Equal(test_data.FrobModel.LogIndex))
			Expect(dbFrob.TransactionIndex).To(Equal(test_data.FrobModel.TransactionIndex))
			Expect(dbFrob.Raw).To(MatchJSON(test_data.FrobModel.Raw))
		})

		It("marks header as checked for logs", func() {
			err = frobRepository.Create(headerID, []frob.FrobModel{test_data.FrobModel})

			Expect(err).NotTo(HaveOccurred())
			var headerChecked bool
			err = db.Get(&headerChecked, `SELECT frob_checked FROM public.checked_headers WHERE header_id = $1`, headerID)
			Expect(err).NotTo(HaveOccurred())
			Expect(headerChecked).To(BeTrue())
		})

		It("updates the header to checked if checked headers row already exists", func() {
			_, err = db.Exec(`INSERT INTO public.checked_headers (header_id) VALUES ($1)`, headerID)
			Expect(err).NotTo(HaveOccurred())

			err = frobRepository.Create(headerID, []frob.FrobModel{test_data.FrobModel})

			Expect(err).NotTo(HaveOccurred())
			var headerChecked bool
			err = db.Get(&headerChecked, `SELECT frob_checked FROM public.checked_headers WHERE header_id = $1`, headerID)
			Expect(err).NotTo(HaveOccurred())
			Expect(headerChecked).To(BeTrue())
		})

		It("does not duplicate frob events", func() {
			err = frobRepository.Create(headerID, []frob.FrobModel{test_data.FrobModel})
			Expect(err).NotTo(HaveOccurred())

			err = frobRepository.Create(headerID, []frob.FrobModel{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() {
			err = frobRepository.Create(headerID, []frob.FrobModel{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, urn, log_idx, tx_idx, raw_log FROM maker.frob WHERE header_id = $1`, headerID)
			Expect(err).To(HaveOccurred())
			Expect(err).To(MatchError(sql.ErrNoRows))
		})
	})

	Describe("MarkHeaderChecked", func() {
		var headerID int64

		BeforeEach(func() {
			headerID, err = headerRepository.CreateOrUpdateHeader(fakes.FakeHeader)
			Expect(err).NotTo(HaveOccurred())
		})

		It("creates a row for a new headerID", func() {
			err = frobRepository.MarkHeaderChecked(headerID)

			Expect(err).NotTo(HaveOccurred())
			var headerChecked bool
			err = db.Get(&headerChecked, `SELECT frob_checked FROM public.checked_headers WHERE header_id = $1`, headerID)
			Expect(err).NotTo(HaveOccurred())
			Expect(headerChecked).To(BeTrue())
		})

		It("updates row when headerID already exists", func() {
			_, err = db.Exec(`INSERT INTO public.checked_headers (header_id) VALUES ($1)`, headerID)

			err = frobRepository.MarkHeaderChecked(headerID)

			Expect(err).NotTo(HaveOccurred())
			var headerChecked bool
			err = db.Get(&headerChecked, `SELECT frob_checked FROM public.checked_headers WHERE header_id = $1`, headerID)
			Expect(err).NotTo(HaveOccurred())
			Expect(headerChecked).To(BeTrue())
		})
	})

	Describe("MissingHeaders", func() {
		var (
			startingBlock, endingBlock, frobBlock int64
			blockNumbers, headerIDs               []int64
		)

		BeforeEach(func() {
			startingBlock = GinkgoRandomSeed()
			frobBlock = startingBlock + 1
			endingBlock = startingBlock + 2

			blockNumbers = []int64{startingBlock, frobBlock, endingBlock, endingBlock + 1}

			headerIDs = []int64{}
			for _, n := range blockNumbers {
				headerID, err := headerRepository.CreateOrUpdateHeader(fakes.GetFakeHeader(n))
				Expect(err).NotTo(HaveOccurred())
				headerIDs = append(headerIDs, headerID)
			}
		})

		It("returns headers that haven't been checked", func() {
			err := frobRepository.MarkHeaderChecked(headerIDs[1])
			Expect(err).NotTo(HaveOccurred())

			headers, err := frobRepository.MissingHeaders(startingBlock, endingBlock)

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

		It("only treats headers as checked if frob logs have been checked", func() {
			_, err := db.Exec(`INSERT INTO public.checked_headers (header_id) VALUES ($1)`, headerIDs[1])
			Expect(err).NotTo(HaveOccurred())

			headers, err := frobRepository.MissingHeaders(startingBlock, endingBlock)

			Expect(err).NotTo(HaveOccurred())
			Expect(len(headers)).To(Equal(3))
			Expect(headers[0].BlockNumber).To(Or(Equal(startingBlock), Equal(endingBlock), Equal(frobBlock)))
			Expect(headers[1].BlockNumber).To(Or(Equal(startingBlock), Equal(endingBlock), Equal(frobBlock)))
			Expect(headers[2].BlockNumber).To(Or(Equal(startingBlock), Equal(endingBlock), Equal(frobBlock)))
		})

		It("only returns headers associated with the current node", func() {
			dbTwo := test_config.NewTestDB(core.Node{ID: "second"})
			headerRepositoryTwo := repositories.NewHeaderRepository(dbTwo)
			for _, n := range blockNumbers {
				_, err = headerRepositoryTwo.CreateOrUpdateHeader(fakes.GetFakeHeader(n))
				Expect(err).NotTo(HaveOccurred())
			}
			frobRepositoryTwo := frob.NewFrobRepository(dbTwo)
			err := frobRepository.MarkHeaderChecked(headerIDs[0])
			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)))
		})
	})
})