package ui

import (
	"fmt"

	"github.com/jroimartin/gocui"

	"github.com/edouardparis/lntop/app"
)

type Ui struct {
	app *app.App
}

func (u *Ui) Run() error {
	g, err := gocui.NewGui(gocui.OutputNormal)
	if err != nil {
		return err
	}
	defer g.Close()

	g.SetManagerFunc(layout)

	if err := g.SetKeybinding("", gocui.KeyCtrlC, gocui.ModNone, quit); err != nil {
		return err
	}

	if err := g.MainLoop(); err != nil && err != gocui.ErrQuit {
		return err
	}
	return err
}

func layout(g *gocui.Gui) error {
	maxX, maxY := g.Size()
	if v, err := g.SetView("hello", maxX/2-7, maxY/2, maxX/2+7, maxY/2+2); err != nil {
		if err != gocui.ErrUnknownView {
			return err
		}
		fmt.Fprintln(v, "Hello world!")
	}
	return nil
}

func quit(g *gocui.Gui, v *gocui.View) error {
	return gocui.ErrQuit
}

func New(app *app.App) *Ui {
	return &Ui{app: app}
}