// Copyright 2018 Google LLC
//
// 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 main

import (
	"context"
	"fmt"
	"net/http"
	"os"
	"time"

	"github.com/gorilla/mux"
	"github.com/pkg/errors"
	"github.com/sirupsen/logrus"
	"go.opentelemetry.io/otel/api/global"
	"go.opentelemetry.io/otel/api/kv"
	"go.opentelemetry.io/otel/exporters/trace/jaeger"
	"go.opentelemetry.io/otel/instrumentation/grpctrace"
	"google.golang.org/grpc"

	otelhttp "go.opentelemetry.io/contrib/instrumentation/net/http"
	sdktrace "go.opentelemetry.io/otel/sdk/trace"
)

const (
	port            = "8080"
	defaultCurrency = "USD"
	cookieMaxAge    = 60 * 60 * 48

	cookiePrefix    = "shop_"
	cookieSessionID = cookiePrefix + "session-id"
	cookieCurrency  = cookiePrefix + "currency"
)

var (
	whitelistedCurrencies = map[string]bool{
		"USD": true,
		"EUR": true,
		"CAD": true,
		"JPY": true,
		"GBP": true,
		"TRY": true}
)

type ctxKeySessionID struct{}

type frontendServer struct {
	productCatalogSvcAddr string
	productCatalogSvcConn *grpc.ClientConn

	currencySvcAddr string
	currencySvcConn *grpc.ClientConn

	cartSvcAddr string
	cartSvcConn *grpc.ClientConn

	recommendationSvcAddr string
	recommendationSvcConn *grpc.ClientConn

	checkoutSvcAddr string
	checkoutSvcConn *grpc.ClientConn

	shippingSvcAddr string
	shippingSvcConn *grpc.ClientConn

	adSvcAddr string
	adSvcConn *grpc.ClientConn
}

func main() {
	ctx := context.Background()
	log := logrus.New()
	log.Level = logrus.DebugLevel
	log.Formatter = &logrus.JSONFormatter{
		FieldMap: logrus.FieldMap{
			logrus.FieldKeyTime:  "timestamp",
			logrus.FieldKeyLevel: "severity",
			logrus.FieldKeyMsg:   "message",
		},
		TimestampFormat: time.RFC3339Nano,
	}
	log.Out = os.Stdout

	initTracer(log)

	srvPort := port
	if os.Getenv("PORT") != "" {
		srvPort = os.Getenv("PORT")
	}
	addr := os.Getenv("LISTEN_ADDR")
	svc := new(frontendServer)
	mustMapEnv(&svc.productCatalogSvcAddr, "PRODUCT_CATALOG_SERVICE_ADDR")
	mustMapEnv(&svc.currencySvcAddr, "CURRENCY_SERVICE_ADDR")
	// svc.cartSvcAddr = "localhost:7070"
	mustMapEnv(&svc.cartSvcAddr, "CART_SERVICE_ADDR")
	mustMapEnv(&svc.recommendationSvcAddr, "RECOMMENDATION_SERVICE_ADDR")
	mustMapEnv(&svc.checkoutSvcAddr, "CHECKOUT_SERVICE_ADDR")
	mustMapEnv(&svc.shippingSvcAddr, "SHIPPING_SERVICE_ADDR")
	mustMapEnv(&svc.adSvcAddr, "AD_SERVICE_ADDR")

	mustConnGRPC(ctx, &svc.currencySvcConn, svc.currencySvcAddr)
	mustConnGRPC(ctx, &svc.productCatalogSvcConn, svc.productCatalogSvcAddr)
	mustConnGRPC(ctx, &svc.cartSvcConn, svc.cartSvcAddr)
	mustConnGRPC(ctx, &svc.recommendationSvcConn, svc.recommendationSvcAddr)
	mustConnGRPC(ctx, &svc.shippingSvcConn, svc.shippingSvcAddr)
	mustConnGRPC(ctx, &svc.checkoutSvcConn, svc.checkoutSvcAddr)
	mustConnGRPC(ctx, &svc.adSvcConn, svc.adSvcAddr)

	r := mux.NewRouter()
	r.HandleFunc("/", svc.homeHandler).Methods(http.MethodGet, http.MethodHead)
	r.HandleFunc("/product/{id}", svc.productHandler).Methods(http.MethodGet, http.MethodHead)
	r.HandleFunc("/cart", svc.viewCartHandler).Methods(http.MethodGet, http.MethodHead)
	r.HandleFunc("/cart", svc.addToCartHandler).Methods(http.MethodPost)
	r.HandleFunc("/cart/empty", svc.emptyCartHandler).Methods(http.MethodPost)
	r.HandleFunc("/setCurrency", svc.setCurrencyHandler).Methods(http.MethodPost)
	r.HandleFunc("/logout", svc.logoutHandler).Methods(http.MethodGet)
	r.HandleFunc("/cart/checkout", svc.placeOrderHandler).Methods(http.MethodPost)
	r.PathPrefix("/static/").Handler(http.StripPrefix("/static/", http.FileServer(http.Dir("./static/"))))
	r.HandleFunc("/robots.txt", func(w http.ResponseWriter, _ *http.Request) { fmt.Fprint(w, "User-agent: *\nDisallow: /") })
	r.HandleFunc("/_healthz", func(w http.ResponseWriter, _ *http.Request) { fmt.Fprint(w, "ok") })

	var handler http.Handler = r
	handler = &logHandler{log: log, next: handler} // add logging
	handler = ensureSessionID(handler)             // add session ID
	handler = otelhttp.NewHandler(handler, "hipstershop.Frontend/Recv.")

	log.Infof("starting server on " + addr + ":" + srvPort)
	log.Fatal(http.ListenAndServe(addr+":"+srvPort, handler))
}

// initTracer creates a new trace provider instance and registers it as global trace provider.
func initTracer(log logrus.FieldLogger) func() {

	svcAddr := os.Getenv("JAEGER_SERVICE_ADDR")
	// svcAddr := "http://localhost:14268/api/traces"
	podIp := os.Getenv("POD_IP")
	podName := os.Getenv("POD_NAME")
	nodeName := os.Getenv("NODE_NAME")
    serviceName := os.Getenv("SERVICE_NAME")

	if svcAddr == "" {
		log.Info("jaeger initialization disabled.")
	}
	endPoint := fmt.Sprintf("http://%s", svcAddr)
	// Create and install Jaeger export pipeline
	flush, err := jaeger.InstallNewPipeline(
		jaeger.WithCollectorEndpoint(endPoint),
		jaeger.WithProcess(jaeger.Process{
			ServiceName: serviceName,
			Tags: []kv.KeyValue{
				kv.String("exporter", "jaeger"),
				kv.Float64("float", 312.23),
				kv.String("ip", podIp),
				kv.String("name", podName),
				kv.String("node_name", nodeName),
			},
		}),
		jaeger.WithSDK(&sdktrace.Config{DefaultSampler: sdktrace.AlwaysSample()}),
	)
	if err != nil {
		log.Fatal(err)
	}

	log.Info("jaeger initialization completed.")
	return func() {
		flush()
	}
}

func mustMapEnv(target *string, envKey string) {
	v := os.Getenv(envKey)
	if v == "" {
		panic(fmt.Sprintf("environment variable %q not set", envKey))
	}
	*target = v
}

func mustConnGRPC(ctx context.Context, conn **grpc.ClientConn, addr string) {
	var err error
	*conn, err = grpc.DialContext(ctx, addr,
		grpc.WithInsecure(),
		grpc.WithTimeout(time.Second*3),
		grpc.WithUnaryInterceptor(grpctrace.UnaryClientInterceptor(global.Tracer(""))),
		grpc.WithStreamInterceptor(grpctrace.StreamClientInterceptor(global.Tracer(""))),
	)
	if err != nil {
		panic(errors.Wrapf(err, "grpc: failed to connect %s", addr))
	}
}