package ui

import (
	"fmt"
	"time"

	tea "charm.land/bubbletea/v2"
)

// toastKind selects which of the theme's toast styles a notification uses.
type toastKind int

const (
	toastInfo toastKind = iota
	toastSuccess
	toastWarn
	toastErr
)

// toast is a transient status/error message shown in the footer. Replaces
// the old Model.statusText/errText, which never expired once set.
type toast struct {
	kind toastKind
	text string
	seq  int
}

// toastExpireMsg clears the toast identified by seq — guarded so a
// newer toast issued while an older one's timer is still running can't be
// clobbered by the older timer firing after it.
type toastExpireMsg struct{ seq int }

// notify replaces the current toast and returns the tea.Cmd that expires
// it. Errors linger noticeably longer than routine status updates.
func (m *Model) notify(kind toastKind, format string, args ...any) tea.Cmd {
	m.toastSeq++
	seq := m.toastSeq
	m.toast = &toast{kind: kind, text: fmt.Sprintf(format, args...), seq: seq}

	d := 4 * time.Second
	if kind == toastErr {
		d = 8 * time.Second
	}
	return tea.Tick(d, func(time.Time) tea.Msg { return toastExpireMsg{seq: seq} })
}

func (m *Model) clearExpiredToast(msg toastExpireMsg) {
	if m.toast != nil && m.toast.seq == msg.seq {
		m.toast = nil
	}
}

// toastView renders the current toast, or "" if there is none.
func (m *Model) toastView() string {
	if m.toast == nil {
		return ""
	}
	switch m.toast.kind {
	case toastSuccess:
		return m.styles.ToastSuccess.Render(symOK + " " + m.toast.text)
	case toastWarn:
		return m.styles.ToastWarn.Render(symWarn + " " + m.toast.text)
	case toastErr:
		return m.styles.ToastError.Render(symErr + " " + m.toast.text)
	default:
		return m.styles.ToastInfo.Render(m.toast.text)
	}
}