package internal

import (
	"fmt"
	"os"
	"time"

	"charm.land/bubbles/v2/spinner"
	"charm.land/lipgloss/v2"
)

type SpinnerState int

const (
	StateThinking SpinnerState = iota
	StateAnswering
	StateDone
)

type Spinner struct {
	text    string
	state   SpinnerState
	spinner spinner.Model
	stopCh  chan struct{}
	doneCh  chan struct{}
}

func NewSpinner(text string) *Spinner {
	s := spinner.New(
		spinner.WithSpinner(spinner.MiniDot),
		spinner.WithStyle(lipgloss.NewStyle().Foreground(lipgloss.Color("243"))),
	)
	return &Spinner{
		text:    text,
		state:   StateThinking,
		spinner: s,
		stopCh:  make(chan struct{}),
		doneCh:  make(chan struct{}),
	}
}

func (s *Spinner) Start() {
	go s.run()
	s.tick()
}

func (s *Spinner) Update(text string) {
	s.text = text
	s.state = StateAnswering
}

func (s *Spinner) Stop() {
	close(s.stopCh)
	<-s.doneCh
}

func (s *Spinner) tick() {
	msg := s.spinner.Tick()
	if msg, ok := msg.(spinner.TickMsg); ok {
		s.spinner, _ = s.spinner.Update(msg)
	}
}

func (s *Spinner) run() {
	defer close(s.doneCh)

	ticker := time.NewTicker(time.Second / 12)
	defer ticker.Stop()

	for {
		select {
		case <-ticker.C:
			s.tick()
			s.render()
		case <-s.stopCh:
			s.clear()
			return
		}
	}
}

func (s *Spinner) render() {
	fmt.Printf("\r  %s %s", s.spinner.View(), s.text)
	os.Stdout.Sync()
}

func (s *Spinner) clear() {
	fmt.Printf("\r  %s 思考完成.\n", s.spinner.View())
	os.Stdout.Sync()
}