package runtime

import (
	"fmt"
	golog "log"
	"net/rpc"
	"os"
	"time"

	"github.com/rs/zerolog"

	mzlog "github.com/asim/go-micro/plugins/logger/zerolog/v3"
	"github.com/asim/go-micro/v3/logger"

	"github.com/owncloud/ocis/ocis/pkg/config"

	"github.com/owncloud/ocis/ocis/pkg/runtime/process"
	"github.com/owncloud/ocis/ocis/pkg/runtime/service"
)

var (
	// OwncloudNamespace is the base path for micro' services to use
	OwncloudNamespace = "com.owncloud."

	// MicroServices to start as part of the fullstack option
	MicroServices = []string{
		"api",      // :8080
		"registry", // :8000
	}

	// Extensions are oCIS extension services
	Extensions = []string{
		"glauth",
		"idp",
		"ocs",
		"onlyoffice",
		"proxy",
		"settings",
		"store",
		"storage-frontend",
		"storage-gateway",
		"storage-userprovider",
		"storage-groupprovider",
		"storage-auth-basic",
		"storage-auth-bearer",
		"storage-home",
		"storage-users",
		"storage-metadata",
		"storage-public-link",
		"thumbnails",
		"web",
		"webdav",
		//"graph",
		//"graph-explorer",
	}

	// There seem to be a race condition when reva-sharing needs to read the sharing.json file and the parent folder is not present.
	dependants = []string{
		"accounts",
		"storage-sharing",
	}

	// Maximum number of retries until getting a connection to the rpc runtime service.
	maxRetries = 10
)

// Runtime represents an oCIS runtime environment.
type Runtime struct {
	c *config.Config
}

// New creates a new oCIS + micro runtime
func New(cfg *config.Config) Runtime {
	return Runtime{
		c: cfg,
	}
}

// Start rpc runtime
func (r *Runtime) Start() error {
	setMicroLogger(r.c.Log)
	go r.Launch()
	return service.Start(
		service.WithLogPretty(r.c.Log.Pretty),
	)
}

// for logging reasons we don't want the same logging level on both oCIS and micro. As a framework builder we do not
// want to expose to the end user the internal framework logs unless explicitly specified.a
func setMicroLogger(log config.Log) {
	if os.Getenv("MICRO_LOG_LEVEL") == "" {
		os.Setenv("MICRO_LOG_LEVEL", "error")
	}

	lev, err := zerolog.ParseLevel(os.Getenv("MICRO_LOG_LEVEL"))
	if err != nil {
		lev = zerolog.ErrorLevel
	}
	logger.DefaultLogger = mzlog.NewLogger(logger.WithLevel(logger.Level(lev)))
}

// Launch oCIS default oCIS extensions.
func (r *Runtime) Launch() {
	var client *rpc.Client
	var err error
	var try int

	for {
		if try >= maxRetries {
			golog.Fatal("could not get a connection to rpc runtime on localhost:10666")
		}
		client, err = rpc.DialHTTP("tcp", "localhost:10666")
		if err != nil {
			try++
			fmt.Println("runtime not available, retrying in 1 second...")
			time.Sleep(1 * time.Second)
		} else {
			goto OUT
		}
	}

OUT:
	//for _, v := range MicroServices {
	//	RunService(client, v)
	//}

	for _, v := range Extensions {
		RunService(client, v)
	}

	if len(dependants) > 0 {
		// TODO(refs) this should disappear and tackled at the runtime (pman) level.
		// see https://github.com/cs3org/reva/issues/795 for race condition.
		// dependants might not be needed on a ocis_simple build, therefore
		// it should not be started under these circumstances.
		time.Sleep(2 * time.Second)
		for _, v := range dependants {
			RunService(client, v)
		}
	}
}

// RunService sends a Service.Start command with the given service name  to pman
func RunService(client *rpc.Client, service string) int {
	args := process.NewProcEntry(service, os.Environ(), []string{service}...)

	all := append(Extensions, dependants...)
	if !contains(all, service) {
		return 1
	}

	var reply int
	if err := client.Call("Service.Start", args, &reply); err != nil {
		golog.Fatal(err)
	}
	return reply
}

func contains(a []string, b string) bool {
	for i := range a {
		if a[i] == b {
			return true
		}
	}
	return false
}