package tui

import (
    "fmt"
    "log"
    "strconv"
    "time"
    "github.com/rivo/tview"
    _ "github.com/gdamore/tcell/v2"
)

type TUI struct {
    *Display
    //*LocalView
    *TUIClient
    SelectedReactor <-chan uint32
    Err chan error
}

func NewTUI(ip string, port int, ch chan error) *TUI {
    //r := make(map[uint32]*Reactor)
    t := &TUI{}
    //l := new(LocalView)
    //l.Reactors = r
    //t.LocalView = l
    t.Err = ch
    client := NewTUIClient(ip, port)
    t.TUIClient = client
    return t
}

func (t *TUI) Start() {
    // setup tview app and wait for user connection in standin modal
    if err := t.TUIClient.Start(); err != nil {
        t.Err <- err
    }
    go t.Monitor()
    t.CreateDisplay()
    t.Display.Start()
    //go t.Refresh()
}

func (t *TUI) CreateDisplay() {
    c := make(chan uint32)
    t.Display = NewDisplay(c)
    t.SelectedReactor = c
    t.ReactorList.AddItem("REACTOR IS ONLINE"," ",0,nil)
    t.Flex.AddItem(t.ReactorList,0,1,true).
    AddItem(t.DeviceList,0,2,false)
}

func (t *TUI) Monitor() {
    // orchestrates updates and grpc requests
    timer := make(chan struct{})
    go func(signal chan struct{}){
        for {
            signal <- struct{}{}
            time.Sleep(1 * time.Second)
        }
    }(timer)

    for {
        select {
        case reactor := <-t.SelectedReactor:
            // reactor has been selected in tui, grabbing devs
            go t.UpdateDevices(reactor)
            //devs := t.GetReactorDevices(reactor)
            //t.DisplayReactorDevices(devs)
        case <-timer:
            // time to ping for status
            t.App.QueueUpdateDraw(func() {
                t.UpdateReactors()
            })
        }
    }
}

func (t *TUI) UpdateDevices(r uint32) {
    // get devices for the reactor and update the tui
    devs, err := t.TUIClient.GetReactorDevices(r)
    if err != nil {
        log.Fatal(err)
    }
    //for a, d := range devs {
      //  go t.LocalView.UpdateReactorDevices(r,a,d)
    //}
    t.DisplayReactorDevices(devs)
}

func (t *TUI) UpdateReactors() {
    // get all reactors and update the tui
    reactors, err := t.TUIClient.GetReactors()
    if err != nil {
        log.Fatal(err)
    }
    t.DisplayReactors(reactors)
    //for id, r := range reactors {
      //  go t.LocalView.UpdateReactors(id, r)
    //}
}


// display struct and logic
type Display struct {
    App *tview.Application
    Flex *tview.Flex
    ReactorList *tview.List
    DeviceList *tview.List
    SelectedReactor chan<- uint32
}

func NewDisplay(ch chan uint32) *Display {
    d := &Display{}
    d.App = tview.NewApplication()
    d.Flex = tview.NewFlex()
    d.ReactorList = tview.NewList().ShowSecondaryText(false)
    d.DeviceList = tview.NewList().ShowSecondaryText(false)
    d.ReactorList.SetTitle("Reactors").SetBorder(true)
    d.DeviceList.SetTitle("Devices").SetBorder(true)
    d.SelectedReactor = ch
    return d
}

func (d *Display) Start() {
    if err := d.App.SetRoot(d.Flex, true).Run(); err != nil {
        d.App.Stop()
        log.Fatal(err)
    }
}

func (d *Display) DisplayReactors(r map[uint32]*Reactor) {
    // function to display reactor list to table
    d.ReactorList.Clear()
    for id, reactor := range r {
        var status string
        if reactor.Status {
            status = "[green]ONLINE"
        } else {
            status = "[red]OFFLINE"
        }
        txt := fmt.Sprintf("%v is %v", id, status)
        d.ReactorList.AddItem(txt,string(id),0,nil)
    }
}

func (d *Display) SelectReactor(index int, main, id string, r rune) {
    // called when reactor in list in selected
    if id, err := strconv.Atoi(id); err != nil {
        log.Fatal(err)
    } else {
        d.SelectedReactor <-uint32(id)
    }
}

func (d *Display) DisplayReactorDevices(devs map[int]*Device) {
    //Function that displays devices to the table
    //d.DeviceList.Clear()
    for addr, dev := range devs {
        var status string
        if dev.Status == "ACTIVE" {
            status = "[green]ACTIVE[white]"
        } else if dev.Status == "KILLED" {
            status = "[red]KILLED[white]"
        }
        txt := fmt.Sprintf("%v is %v at %x",dev.Type,status,addr)
        d.DeviceList.AddItem(txt,"",0,nil)
    }
    d.App.Draw()
}