// 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 price_feeds_test

import (
	"database/sql"
	"encoding/json"

	"github.com/ethereum/go-ethereum/core/types"
	. "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/transformers/price_feeds"
	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
	"github.com/vulcanize/vulcanizedb/test_config"
)

var _ = Describe("Price feeds repository", func() {
	var (
		db                  *postgres.DB
		err                 error
		headerRepository    datastore.HeaderRepository
		priceFeedRepository price_feeds.IPriceFeedRepository
		rawHeader           []byte
	)

	BeforeEach(func() {
		db = test_config.NewTestDB(core.Node{})
		test_config.CleanTestDB(db)
		headerRepository = repositories.NewHeaderRepository(db)
		priceFeedRepository = price_feeds.NewPriceFeedRepository(db)
		rawHeader, err = json.Marshal(types.Header{})
		Expect(err).NotTo(HaveOccurred())
	})

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

		BeforeEach(func() {
			headerID, err = headerRepository.CreateOrUpdateHeader(core.Header{Raw: rawHeader})
			Expect(err).NotTo(HaveOccurred())

			err = priceFeedRepository.Create(headerID, []price_feeds.PriceFeedModel{test_data.PriceFeedModel})
			Expect(err).NotTo(HaveOccurred())
		})

		It("persists a price feed update", func() {
			var dbPriceFeedUpdate price_feeds.PriceFeedModel
			err = db.Get(&dbPriceFeedUpdate, `SELECT block_number, medianizer_address, usd_value, tx_idx, raw_log FROM maker.price_feeds WHERE header_id = $1`, headerID)
			Expect(err).NotTo(HaveOccurred())
			Expect(dbPriceFeedUpdate.BlockNumber).To(Equal(test_data.PriceFeedModel.BlockNumber))
			Expect(dbPriceFeedUpdate.MedianizerAddress).To(Equal(test_data.PriceFeedModel.MedianizerAddress))
			Expect(dbPriceFeedUpdate.UsdValue).To(Equal(test_data.PriceFeedModel.UsdValue))
			Expect(dbPriceFeedUpdate.TransactionIndex).To(Equal(test_data.PriceFeedModel.TransactionIndex))
			Expect(dbPriceFeedUpdate.Raw).To(MatchJSON(test_data.PriceFeedModel.Raw))
		})

		It("marks headerID as checked for price feed logs", func() {
			var headerChecked bool
			err = db.Get(&headerChecked, `SELECT price_feeds_checked FROM public.checked_headers WHERE header_id = $1`, headerID)
			Expect(err).NotTo(HaveOccurred())
			Expect(headerChecked).To(BeTrue())
		})

		It("does not duplicate price feed updates", func() {
			err = priceFeedRepository.Create(headerID, []price_feeds.PriceFeedModel{test_data.PriceFeedModel})

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

		It("removes price feed if corresponding header is deleted", func() {
			_, err = db.Exec(`DELETE FROM headers WHERE id = $1`, headerID)

			Expect(err).NotTo(HaveOccurred())
			var dbResult price_feeds.PriceFeedModel
			err = db.Get(&dbResult, `SELECT block_number, medianizer_address, usd_value, tx_idx, raw_log FROM maker.price_feeds 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(core.Header{Raw: rawHeader})
			Expect(err).NotTo(HaveOccurred())
		})

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

			Expect(err).NotTo(HaveOccurred())
			var headerChecked bool
			err = db.Get(&headerChecked, `SELECT price_feeds_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 = priceFeedRepository.MarkHeaderChecked(headerID)

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

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

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

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

			headerIDs = []int64{}
			for _, n := range blockNumbers {
				headerID, err := headerRepository.CreateOrUpdateHeader(core.Header{BlockNumber: n, Raw: rawHeader})
				Expect(err).NotTo(HaveOccurred())
				headerIDs = append(headerIDs, headerID)
			}

		})

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

			headers, err := priceFeedRepository.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 price feeds have been checked", func() {
			_, err := db.Exec(`INSERT INTO public.checked_headers (header_id) VALUES ($1)`, headerIDs[1])
			Expect(err).NotTo(HaveOccurred())

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

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

		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(core.Header{BlockNumber: n, Raw: rawHeader})
				Expect(err).NotTo(HaveOccurred())
			}
			priceFeedRepositoryTwo := price_feeds.NewPriceFeedRepository(dbTwo)
			err := priceFeedRepository.MarkHeaderChecked(headerIDs[0])
			Expect(err).NotTo(HaveOccurred())

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

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