package http

import (
	"github.com/sirupsen/logrus"
	"github.com/spiral/roadrunner/_____/utils"
	"github.com/pkg/errors"
)

type rpcServer struct {
	service *Service
}

// WorkerList contains list of workers.
type WorkerList struct {
	// Workers is list of workers.
	Workers []utils.Worker `json:"workers"`
}

// Reset resets underlying RR worker pool and restarts all of it's workers.
func (rpc *rpcServer) Reset(reset bool, r *string) error {
	if rpc.service.srv == nil {
		return errors.New("no http server")
	}

	logrus.Info("http: restarting worker pool")
	*r = "OK"

	err := rpc.service.srv.rr.Reset()
	if err != nil {
		logrus.Errorf("http: %s", err)
	}

	return err
}

// Workers returns list of active workers and their stats.
func (rpc *rpcServer) Workers(list bool, r *WorkerList) error {
	if rpc.service.srv == nil {
		return errors.New("no http server")
	}

	r.Workers = utils.FetchWorkers(rpc.service.srv.rr)
	return nil
}

// Worker provides information about specific worker.
type Worker struct {
	// Pid contains process id.
	Pid int `json:"pid"`

	// Status of the worker.
	Status string `json:"status"`

	// Number of worker executions.
	NumExecs uint64 `json:"numExecs"`

	// Created is unix nano timestamp of worker creation time.
	Created int64 `json:"created"`

	// Updated is unix nano timestamp of last worker execution.
	Updated int64 `json:"updated"`
}

// FetchWorkers fetches list of workers from RR Server.
func FetchWorkers(srv *roadrunner.Server) (result []Worker) {
	for _, w := range srv.Workers() {
		state := w.State()
		result = append(result, Worker{
			Pid:      *w.Pid,
			Status:   state.String(),
			NumExecs: state.NumExecs(),
			Created:  w.Created.UnixNano(),
			Updated:  state.Updated().UnixNano(),
		})
	}

	return
}