// command_input.go implements a vim-style command input overlay. Opened
// with the command_mode keybind (:), it accepts commands like :q, :quit,
// and :logout. Unknown commands are silently ignored.
package chat

import (
	"github.com/ayn2op/tview"
	"github.com/ayn2op/tview/keybind"
	"github.com/ayn2op/tview/layers"
)

const commandInputLayerName = "commandInput"

type commandInput struct {
	*tview.InputField
	chatView *Model
}

func newCommandInput(chatView *Model) *commandInput {
	ci := &commandInput{
		InputField: tview.NewInputField(),
		chatView:   chatView,
	}
	ci.SetLabel(":")
	ci.SetFieldWidth(0)
	return ci
}

func (ci *commandInput) HandleEvent(event tview.Event) tview.Command {
	switch event := event.(type) {
	case *tview.KeyEvent:
		switch {
		case keybind.Matches(event, keybind.NewKeybind(keybind.WithKeys("enter"))):
			text := ci.GetText()
			ci.SetText("")
			ci.chatView.closeCommandInput()
			return ci.execute(text)
		case keybind.Matches(event, keybind.NewKeybind(keybind.WithKeys("esc"))):
			ci.SetText("")
			ci.chatView.closeCommandInput()
			return nil
		}
	}
	return ci.InputField.HandleEvent(event)
}

func (ci *commandInput) execute(cmd string) tview.Command {
	switch cmd {
	case "q", "quit":
		return func() tview.Event {
			return &QuitEvent{}
		}
	case "logout":
		return tview.Batch(ci.chatView.closeState(), ci.chatView.logout())
	default:
		return nil
	}
}

func (m *Model) openCommandInput() {
	m.AddLayer(
		m.commandInput,
		layers.WithName(commandInputLayerName),
		layers.WithResize(true),
		layers.WithVisible(true),
		layers.WithOverlay(),
	).SendToFront(commandInputLayerName)
	m.app.SetFocus(m.commandInput)
}

func (m *Model) closeCommandInput() {
	m.RemoveLayer(commandInputLayerName)
}