package main

import (
	"context"
	"flag"
	"fmt"
	"net"

	"dataservices/api"
	"dataservices/commons/config"
	"dataservices/commons/logger"
	"dataservices/commons/metrics"
	"dataservices/commons/redisutil"
	"dataservices/commons/sentry"
	"dataservices/commons/sessioncache"
	"dataservices/ddb"
	controller "dataservices/internal/controller/dataapi_gateway"

	"github.com/gin-gonic/gin"
	"github.com/pingcap/log"
	"github.com/prometheus/client_golang/prometheus/promhttp"
	"github.com/sercand/kuberesolver/v5"
	"github.com/tidbcloud/dataservices/idl/pbgen/proto/dataapi"

	grpc_middleware "github.com/grpc-ecosystem/go-grpc-middleware"
	"github.com/tidbcloud/pkgv2/version"
	"github.com/tidbcloud/tiinf/errs"
	"github.com/tidbcloud/tiinf/monitor/tilog"
	"github.com/tidbcloud/tiinf/monitor/titracing"
	"github.com/tidbcloud/tiinf/transport/http/tigin"
	tigrpc "github.com/tidbcloud/tiinf/transport/tigrpc/server"
	"go.uber.org/zap"
	"google.golang.org/grpc"
)

const (
	componentName     = "dataservices-dataapi-gateway"
	defaultConfigPath = "/etc/dbaas/config.yaml"
)

func main() {
	var configPath string
	flag.StringVar(&configPath, "config-path", defaultConfigPath, "DBaaS configuration file path")
	flag.Parse()
	ctx := context.Background()

	err := config.InitConfig(configPath)
	if err != nil {
		panic(fmt.Sprintf("Initialize config failed: %+v", err))
	}

	err = sentry.SetupLoggerAndSentry(config.Global().SentryConf.DSN, config.Global().SentryConf.Environment, config.Global().SentryConf.LogLevel)
	if err != nil {
		panic(fmt.Sprintf("Initialize logger and sentry failed: %+v", err))
	}
	tilog.Info(context.Background(), fmt.Sprintf("Starting %s service", componentName),
		zap.String("gitHash", version.GitHash),
		zap.String("logLevel", config.Global().ServerConf.LogLevel))

	config := config.Global()
	tilog.Info(context.Background(), "service config", logger.Redact("config", config), zap.String("env", config.CurrentEnv()))
	metrics.RegisterDataApiGatewayMetrics()

	controller.InitRBACConfig(config.AwsConf, config.RBACConf)

	if config.IsAliCloudRegionalMode() {
		tilog.Info(ctx, "running in alicloud regional mode, skip redis and dynamodb initialization")
	} else {
		err = redisutil.NewRedisClient(ctx, config)
		if err != nil {
			tilog.Fatal(ctx, "Initialize redis client failed.", zap.Error(err))
		}
		sessioncache.RegisterRedisDriver(ctx)

		err = ddb.Init(ctx, config)
		if err != nil {
			tilog.Fatal(ctx, "Initialize dynamodb client failed.", zap.Error(err))
		}
	}

	if err = controller.InitCustomLogger(config.CustomLogWriteConf); err != nil {
		tilog.Error(ctx, "InitCustomLogger failed.", zap.Error(err))
	}

	if !config.IsAliCloudRegionalMode() {
		if err = controller.StartUnauthMetricsLoop(); err != nil {
			tilog.Error(ctx, "StartUnauthMetricsLoop failed.", zap.Error(err))
		}
	}
	kuberesolver.RegisterInCluster()

	startup()
}

func startup() {
	go startupTracing()
	go startupMetrics()
	go startupHttp()
	startupGRPC()
}

func startupTracing() {
	// jaeger
	if _, err := titracing.InitJaeger(componentName); err != nil {
		panic(fmt.Sprintf("failed to init tracing, err=%v", err))
	}
}

func startupHttp() {
	ginEng := tigin.Default()
	api.RouteDataApiGatewayAPI(ginEng)
	addr := ":" + config.Global().ServerConf.HttpPort
	log.Info("serving HTTP Service", zap.String("address", addr))
	panic(fmt.Sprintf("HTTP Service died %+v", ginEng.Run(addr)))
}

func startupGRPC() {
	grpcServer := newGRPCServer()
	registerGRPCServices(grpcServer)
	tilog.Info(context.Background(), "register grpc services, port is "+string(config.Global().ServerConf.GrpcPort))
	listen, err := net.Listen("tcp", ":"+config.Global().ServerConf.GrpcPort)
	if err != nil {
		panic(err)
	}
	err = grpcServer.Serve(listen)
	if err != nil {
		panic(err)
	}
}

func startupMetrics() {
	/* metrics */
	mEng := tigin.Default()
	mEng.Any("/metrics", prometheusHandler())
	mEng.Any("/custom-metrics", costomMetricsHandler())
	mEng.Run("0.0.0.0:" + config.Global().ServerConf.MetricsPort)
}

func prometheusHandler() gin.HandlerFunc {
	h := promhttp.Handler()

	return func(c *gin.Context) {
		h.ServeHTTP(c.Writer, c.Request)
	}
}

func costomMetricsHandler() gin.HandlerFunc {
	h := controller.GetCustomMetricsPromHandler()

	return func(c *gin.Context) {
		h.ServeHTTP(c.Writer, c.Request)
	}
}

func newGRPCServer() *grpc.Server {
	server := tigrpc.NewServer(
		tigrpc.WithDefault(),
		tigrpc.WithUnaryInterceptors(
			grpc_middleware.ChainUnaryServer(
				metrics.UnaryServerInterceptor(),
				errs.UnaryServerInterceptor(),
			),
		),
	)
	return server
}

func registerGRPCServices(s *grpc.Server) {
	config := config.Global()
	server, err := controller.CreateDataAPIGatewayService(config.GrpcConf)
	if err != nil {
		panic(err)
	}
	dataapi.RegisterDataAPIGatewayServiceServer(s, server)
}