// Copyright 2017 Google Inc.
//
// 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 apiGatewayDeploy

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

	"encoding/hex"

	"github.com/30x/apid-core"
	"github.com/30x/apid-core/factory"

	"io/ioutil"
	"net/http"
	"net/http/httptest"
	"net/url"
	"os"
	"testing"
	"time"
)

var (
	tmpDir              string
	testServer          *httptest.Server
	testLastTrackerVars map[string]string
	testLastTrackerBody []byte
)

var _ = BeforeSuite(func() {
	apid.Initialize(factory.DefaultServicesFactory())

	config := apid.Config()

	var err error
	tmpDir, err = ioutil.TempDir("", "api_test")
	Expect(err).NotTo(HaveOccurred())

	config.Set("local_storage_path", tmpDir)
	config.Set(configApidInstanceID, "INSTANCE_ID")
	config.Set(configApidClusterID, "CLUSTER_ID")
	config.Set(configApiServerBaseURI, "http://localhost")
	config.Set(configDebounceDuration, "1ms")

	apid.InitializePlugins("")

	// init full DB
	db, err := data.DB()
	Expect(err).NotTo(HaveOccurred())
	err = InitDBFullColumns(db)
	Expect(err).NotTo(HaveOccurred())
	SetDB(db)

	bundleCleanupDelay = time.Millisecond
	bundleRetryDelay = 10 * time.Millisecond
	markDeploymentFailedAfter = 50 * time.Millisecond
	concurrentDownloads = 1
	downloadQueueSize = 1

	router := apid.API().Router()
	// fake an unreliable bundle repo
	count := 1
	failedOnce := false
	router.HandleFunc("/bundles/failonce", func(w http.ResponseWriter, req *http.Request) {
		if failedOnce {
			vars := apid.API().Vars(req)
			w.Write([]byte("/bundles/" + vars["id"]))
		} else {
			failedOnce = true
			w.WriteHeader(500)
		}
	}).Methods("GET")

	router.HandleFunc("/bundles/{id}", func(w http.ResponseWriter, req *http.Request) {
		count++
		vars := apid.API().Vars(req)
		if count%2 == 0 && vars["id"] != "checksum" {
			w.WriteHeader(500)
			return
		}
		if vars["id"] == "longfail" {
			time.Sleep(markDeploymentFailedAfter + (250 * time.Millisecond))
		}
		w.Write([]byte("/bundles/" + vars["id"]))

	}).Methods("GET")

	// fake an unreliable APID tracker
	router.HandleFunc("/clusters/{clusterID}/apids/{instanceID}/deployments",
		func(w http.ResponseWriter, req *http.Request) {
			count++
			if count%2 == 0 {
				w.WriteHeader(500)
				return
			}

			testLastTrackerVars = apid.API().Vars(req)
			testLastTrackerBody, err = ioutil.ReadAll(req.Body)
			Expect(err).ToNot(HaveOccurred())

			w.Write([]byte("OK"))

		}).Methods("PUT")
	testServer = httptest.NewServer(router)
})

var _ = AfterSuite(func() {
	apid.Events().Close()
	if testServer != nil {
		testServer.Close()
	}
	os.RemoveAll(tmpDir)
})

var _ = BeforeEach(func() {
	var err error
	apiServerBaseURI, err = url.Parse(testServer.URL)
	Expect(err).NotTo(HaveOccurred())

	_, err = getDB().Exec("DELETE FROM edgex_deployment")
	Expect(err).ShouldNot(HaveOccurred())

	_, err = getDB().Exec("UPDATE etag SET value=1")
})

func TestApidGatewayDeploy(t *testing.T) {
	RegisterFailHandler(Fail)
	RunSpecs(t, "ApidGatewayDeploy Suite")
}

func testGetChecksum(hashType, uri string) string {
	url, err := url.Parse(uri)
	Expect(err).NotTo(HaveOccurred())

	hashWriter, err := getHashWriter(hashType)
	Expect(err).NotTo(HaveOccurred())

	hashWriter.Write([]byte(url.Path))
	return hex.EncodeToString(hashWriter.Sum(nil))
}