package gui

import (
	"fmt"
	"strings"
	"syscall"

	"github.com/go-errors/errors"
	"github.com/jesseduffield/gocui"
)

func (gui *Gui) getStatusContexts() []string {
	return []string{"logs", "credits"}
}

func (gui *Gui) refreshStatus() error {
	v := gui.getStatusView()

	gui.g.Update(func(*gocui.Gui) error {
		v.Clear()
		fmt.Fprint(v, "lazydocker")
		return nil
	})

	return nil
}

func (gui *Gui) handleStatusSelect(g *gocui.Gui, v *gocui.View) error {
	if gui.popupPanelFocused() {
		return nil
	}

	if _, err := gui.g.SetCurrentView(v.Name()); err != nil {
		return err
	}

	key := gui.getStatusContexts()[gui.State.Panels.Status.ContextIndex]
	if gui.State.Panels.Main.ObjectKey == key {
		return nil
	} else {
		gui.State.Panels.Main.ObjectKey = key
	}

	gui.clearMainView()

	switch gui.getStatusContexts()[gui.State.Panels.Status.ContextIndex] {
	case "credits":
		if err := gui.renderCredits(); err != nil {
			return err
		}
	case "logs":
		if err := gui.renderAllLogs(); err != nil {
			return err
		}
	default:
		return errors.New("Unknown context for status panel")
	}

	return nil
}

func (gui *Gui) renderCredits() error {
	mainView := gui.getMainView()
	mainView.Autoscroll = false
	mainView.Title = "about"

	dashboardString := strings.Join(
		[]string{
			lazydockerTitle(),
			"Copyright (c) 2019 Jesse Duffield",
			"Keybindings: https://github.com/jesseduffield/lazydocker/blob/master/docs/keybindings",
			"Config Options: https://github.com/jesseduffield/lazydocker/blob/master/docs/Config.md",
			"Raise an Issue: https://github.com/jesseduffield/lazydocker/issues",
		}, "\n\n")

	go gui.T.NewTask(func(stop chan struct{}) {
		gui.renderString(gui.g, "main", dashboardString)
	})

	return nil
}

func (gui *Gui) renderAllLogs() error {
	mainView := gui.getMainView()
	mainView.Autoscroll = true
	mainView.Title = "logs"

	go gui.T.NewTask(func(stop chan struct{}) {
		gui.clearMainView()

		cmd := gui.OSCommand.RunCustomCommand(gui.Config.UserConfig.CommandTemplates.AllLogs)

		cmd.Stdout = mainView
		cmd.Stderr = mainView

		cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
		cmd.Start()

		go func() {
			<-stop
			if err := gui.OSCommand.Kill(cmd); err != nil {
				gui.Log.Error(err)
			}
		}()

		cmd.Wait()
	})

	return nil
}

func (gui *Gui) handleOpenConfig(g *gocui.Gui, v *gocui.View) error {
	return gui.openFile(gui.Config.ConfigFilename())
}

func (gui *Gui) handleEditConfig(g *gocui.Gui, v *gocui.View) error {
	return gui.editFile(gui.Config.ConfigFilename())
}

func lazydockerTitle() string {
	return `
   _                     _            _
  | |                   | |          | |
  | | __ _ _____   _  __| | ___   ___| | _____ _ __
  | |/ _` + "`" + ` |_  / | | |/ _` + "`" + ` |/ _ \ / __| |/ / _ \ '__|
  | | (_| |/ /| |_| | (_| | (_) | (__|   <  __/ |
  |_|\__,_/___|\__, |\__,_|\___/ \___|_|\_\___|_|
                __/ |
               |___/
`
}

func (gui *Gui) handleStatusPrevContext(g *gocui.Gui, v *gocui.View) error {
	contexts := gui.getStatusContexts()
	if gui.State.Panels.Status.ContextIndex >= len(contexts)-1 {
		gui.State.Panels.Status.ContextIndex = 0
	} else {
		gui.State.Panels.Status.ContextIndex++
	}

	gui.handleStatusSelect(gui.g, v)

	return nil
}

func (gui *Gui) handleStatusNextContext(g *gocui.Gui, v *gocui.View) error {
	contexts := gui.getStatusContexts()
	if gui.State.Panels.Status.ContextIndex <= 0 {
		gui.State.Panels.Status.ContextIndex = len(contexts) - 1
	} else {
		gui.State.Panels.Status.ContextIndex--
	}

	gui.handleStatusSelect(gui.g, v)

	return nil
}