package shared

import (
	tea "github.com/charmbracelet/bubbletea"
)

// An analogue to tea.Model with support for checking if the model has been
// initialized before
type ViewModel interface {
	Init() tea.Cmd
	Update(tea.Msg) (ViewModel, tea.Cmd)

	// View methods
	Header(width int) string
	// Render the view's main content into a container of the given dimensions
	Content(width, height int) string
	Footer(width int) string
}

type View int

const (
	ViewChat View = iota
	ViewConversations
	ViewSettings
	//StateHelp
)

type (
	// send to change the current state
	MsgViewChange View
	// sent to a state when it is entered, with the view we're leaving
	MsgViewEnter View
	// sent when a recoverable error occurs (displayed to user)
	MsgError struct { Err error }
	// sent when the view has handled a key input
	MsgKeyHandled tea.KeyMsg
)

func ViewEnter(from View) tea.Cmd {
	return func() tea.Msg {
		return MsgViewEnter(from)
	}
}

func ChangeView(view View) tea.Cmd {
	return func() tea.Msg {
		return MsgViewChange(view)
	}
}

func KeyHandled(key tea.KeyMsg) tea.Cmd {
	return func() tea.Msg {
		return MsgKeyHandled(key)
	}
}

func WrapError(err error) tea.Cmd {
	return func() tea.Msg {
		return MsgError{ Err: err }
	}
}

func AsMsgError(err error) MsgError {
	return MsgError{ Err: err }
}