package main

import (
	"context"
	"fmt"
	nethttp "net/http"
	"os"
	"runtime"
	"strings"

	"github.com/influxdata/flux/control"
	"github.com/influxdata/flux/execute"
	"github.com/influxdata/flux/functions"
	"github.com/influxdata/flux/functions/storage"
	influxlogger "github.com/influxdata/influxdb/logger"
	"github.com/influxdata/platform"
	"github.com/influxdata/platform/http"
	"github.com/influxdata/platform/kit/prom"
	"github.com/influxdata/platform/query"
	_ "github.com/influxdata/platform/query/builtin"
	pcontrol "github.com/influxdata/platform/query/control"
	"github.com/influxdata/platform/query/functions/storage/pb"
	"github.com/influxdata/platform/snowflake"
	pzap "github.com/influxdata/platform/zap"
	opentracing "github.com/opentracing/opentracing-go"
	"github.com/pkg/errors"
	"github.com/prometheus/client_golang/prometheus"
	"github.com/spf13/cobra"
	"github.com/spf13/viper"
	"go.uber.org/zap"
)

var (
	// commit represents a hash of the commit that build this binary.
	// Commit is populated with build flags.
	commit string
)

var fluxdCmd = &cobra.Command{
	Use:     "fluxd",
	Short:   "Flux Server",
	Version: commit,
	Run:     fluxF,
}

var (
	bindAddr         string
	concurrencyQuota int
	memoryBytesQuota int
)

func init() {
	viper.SetEnvPrefix("FLUXD")

	fluxdCmd.PersistentFlags().BoolP("verbose", "v", false, "Whether the server should be verbose.")
	viper.BindEnv("VERBOSE")
	viper.BindPFlag("verbose", fluxdCmd.PersistentFlags().Lookup("verbose"))

	fluxdCmd.PersistentFlags().StringVar(&bindAddr, "bind-addr", ":8093", "The bind address for this daemon.")
	viper.BindEnv("BIND_ADDR")
	viper.BindPFlag("bind_addr", fluxdCmd.PersistentFlags().Lookup("bind-addr"))

	fluxdCmd.PersistentFlags().IntVar(&concurrencyQuota, "concurrency", runtime.NumCPU()*2, "The concurrency quota capacity for this daemon.")
	viper.BindEnv("CONCURRENCY")
	viper.BindPFlag("concurrency", fluxdCmd.PersistentFlags().Lookup("cuncurrency"))

	fluxdCmd.PersistentFlags().IntVar(&memoryBytesQuota, "mem-bytes", 0, "The memory-bytes quota capacity for this daemon.")
	viper.BindEnv("MEM_BYTES")
	viper.BindPFlag("mem_bytes", fluxdCmd.PersistentFlags().Lookup("mem-bytes"))

	fluxdCmd.PersistentFlags().String("storage-hosts", "localhost:8082", "host:port address of the storage server.")
	viper.BindEnv("STORAGE_HOSTS")
	viper.BindPFlag("STORAGE_HOSTS", fluxdCmd.PersistentFlags().Lookup("storage-hosts"))

	fluxdCmd.PersistentFlags().String("organization-name", "defaultorgname", "The organization name to use.")
	viper.BindEnv("ORGANIZATION_NAME")
	viper.BindPFlag("ORGANIZATION_NAME", fluxdCmd.PersistentFlags().Lookup("organization-name"))

}

var logger *zap.Logger

func fluxF(cmd *cobra.Command, args []string) {
	// Create top level logger
	logger = influxlogger.New(os.Stdout)

	tracer := new(pzap.Tracer)
	tracer.Logger = logger
	tracer.IDGenerator = snowflake.NewIDGenerator()
	opentracing.SetGlobalTracer(tracer)

	reg := prom.NewRegistry()
	reg.MustRegister(prometheus.NewGoCollector())
	reg.WithLogger(logger)

	config := control.Config{
		ExecutorDependencies: make(execute.Dependencies),
		ConcurrencyQuota:     concurrencyQuota,
		MemoryBytesQuota:     int64(memoryBytesQuota),
		Logger:               logger,
		Verbose:              viper.GetBool("verbose"),
	}
	if err := injectDeps(config.ExecutorDependencies); err != nil {
		logger.Error("error injecting dependencies", zap.Error(err))
		os.Exit(1)
	}
	c := pcontrol.New(config)
	reg.MustRegister(c.PrometheusCollectors()...)

	orgName, err := getStrList("ORGANIZATION_NAME")
	if err != nil {
		logger.Error("failed to get organization name", zap.Error(err))
	}
	orgSvc := &StaticOrganizationService{Name: orgName[0]}

	queryHandler := http.NewExternalQueryHandler()

	queryHandler.ProxyQueryService = query.ProxyQueryServiceBridge{
		QueryService: query.QueryServiceBridge{
			AsyncQueryService: c,
		},
	}
	queryHandler.OrganizationService = orgSvc
	queryHandler.Logger = logger.With(zap.String("handler", "query"))

	handler := http.NewHandlerFromRegistry("query", reg)
	handler.Handler = &Handler{
		QueryHandler:    queryHandler,
		FluxLangHandler: http.NewFluxLangHandler(),
	}
	handler.Logger = logger
	handler.Tracer = tracer

	logger.Info("listening", zap.String("transport", "http"), zap.String("addr", bindAddr))
	if err := nethttp.ListenAndServe(bindAddr, handler); err != nil {
		logger.Error("encountered fatal error", zap.Error(err))
		os.Exit(1)
	}
}

func getStrList(key string) ([]string, error) {
	v := viper.GetViper()
	valStr := v.GetString(key)
	if valStr == "" {
		return nil, errors.New("empty value")
	}

	return strings.Split(valStr, ","), nil
}

func injectDeps(deps execute.Dependencies) error {
	storageHosts, err := getStrList("STORAGE_HOSTS")
	if err != nil {
		return errors.Wrap(err, "failed to get storage hosts")
	}
	sr, err := pb.NewReader(storage.NewStaticLookup(storageHosts))
	if err != nil {
		return err
	}

	orgName, err := getStrList("ORGANIZATION_NAME")
	if err != nil {
		return errors.Wrap(err, "failed to get organization name")
	}
	orgSvc := StaticOrganizationService{Name: orgName[0]}

	return functions.InjectFromDependencies(deps, storage.Dependencies{
		Reader:             sr,
		BucketLookup:       bucketLookup{},
		OrganizationLookup: query.FromOrganizationService(&orgSvc),
	})
}

func main() {
	if err := fluxdCmd.Execute(); err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
}

var (
	staticOrgID platform.ID
)

func init() {
	staticOrgID.DecodeFromString("baab")
}

// StaticOrganizationService connects to Influx via HTTP using tokens to manage organizations.
type StaticOrganizationService struct {
	Name string
}

func (s *StaticOrganizationService) FindOrganizationByID(ctx context.Context, id platform.ID) (*platform.Organization, error) {
	return s.FindOrganization(ctx, platform.OrganizationFilter{})
}

func (s *StaticOrganizationService) FindOrganization(ctx context.Context, filter platform.OrganizationFilter) (*platform.Organization, error) {
	os, n, err := s.FindOrganizations(ctx, filter)
	if err != nil {
		return nil, err
	}

	if n < 1 {
		return nil, fmt.Errorf("expected at least one organization")
	}

	return os[0], nil
}

func (s *StaticOrganizationService) FindOrganizations(ctx context.Context, filter platform.OrganizationFilter, opt ...platform.FindOptions) ([]*platform.Organization, int, error) {
	po := platform.Organization{
		ID:   staticOrgID,
		Name: s.Name,
	}

	return []*platform.Organization{&po}, 1, nil

}

// CreateOrganization creates an organization.
func (s *StaticOrganizationService) CreateOrganization(ctx context.Context, o *platform.Organization) error {
	panic("not implemented")
}

func (s *StaticOrganizationService) UpdateOrganization(ctx context.Context, id platform.ID, upd platform.OrganizationUpdate) (*platform.Organization, error) {
	panic("not implemented")
}

func (s *StaticOrganizationService) DeleteOrganization(ctx context.Context, id platform.ID) error {
	panic("not implemented")
}

type bucketLookup struct{}

func (l bucketLookup) Lookup(orgID platform.ID, name string) (platform.ID, bool) {
	// Cheat and return the bucket name as the ID
	// The deps.Reader will interpret this as the db/rp for the RPC call
	return platform.ID(name), true
}

// Handler handles the incoming http requests for fluxd.
type Handler struct {
	QueryHandler    *http.ExternalQueryHandler
	FluxLangHandler *http.FluxLangHandler
}

// ServeHTTP delegates a request to the appropriate subhandler.
func (h *Handler) ServeHTTP(w nethttp.ResponseWriter, r *nethttp.Request) {
	if strings.HasPrefix(r.URL.Path, "/ping") {
		h.QueryHandler.ServeHTTP(w, r)
		return
	}
	if strings.HasPrefix(r.URL.Path, "/query") {
		h.QueryHandler.ServeHTTP(w, r)
		return
	}

	if strings.HasPrefix(r.URL.Path, "/v2/flux") {
		h.FluxLangHandler.ServeHTTP(w, r)
		return
	}
	nethttp.NotFound(w, r)
}