package server

import (
    "fmt"
    "time"
    "context"
    "sync"
    "google.golang.org/grpc"
    "google.golang.org/grpc/status"
    pb "FRMS/internal/pkg/grpc"
)

// this package will implement a reactor coordinator and associated go routines

type ReactorManager struct {
    *Manager
    Devs *Devices
    ClientConnections <-chan bool
}

type Devices struct {
    mu sync.Mutex
    D map[int]Device
}

func NewReactorManager(c *Client,ch chan bool,err chan error) {
    d := new(Devices)
    r := &ReactorManager{Devs:d,ClientConnections:ch}
    r.Manager = NewManager(c, err)
    go r.Listen()
}

func (r *ReactorManager) Listen() {
    for {
        c := <-r.ClientConnections
        if c {
            r.Start()
        } else {
            r.Exit()
        }
    }
}

func (r *ReactorManager) Start() {
    r.Manager.Start()
    conn := r.Connect()
    go r.Monitor(conn)
}

func (r *ReactorManager) Monitor(conn *grpc.ClientConn) {
    defer conn.Close()
    client := pb.NewMonitoringClient(conn)
    for r.IsActive() {
        req := &pb.ReactorStatusRequest{Id:r.Id}
        resp, err := client.ReactorStatusHandler(context.Background(),req)
        code := status.Code(err)
        if code != 0 { // if != OK
            fmt.Printf("Reactor %v down! Exiting manager...", r.Id)
            r.Exit()
        }
        //for _,v := range resp.GetDevices() {
            // TODO changed sensors
        //}
        fmt.Printf("Reactor %v online\n", resp.GetId())
        time.Sleep(r.Hb * time.Second) // time between sensor pings
    }
}