Multiple choices about bubbletea HOT 4 CLOSED

package main

import (
	"fmt"

	tea "github.com/charmbracelet/bubbletea"
)

func main() {
	m := &model{
		flavors: []item{
			{"orange", false},
			{"strawberry", false},
			{"watermelon", false},
			{"apple", false},
		},
		adds: []item{
			{"candies", false},
			{"mixed colors", false},
			{"strange glass shape", false},
		},
	}
	if err := tea.NewProgram(m).Start(); err != nil {
		panic(fmt.Sprintf("failed to run program: %v", err))
	}
}

type model struct {
	flavors, adds []item
	list, item    int
}

type item struct {
	text    string
	checked bool
}

func (m *model) Init() tea.Cmd {
	return nil
}

func (m *model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
	switch typed := msg.(type) {
	case tea.KeyMsg:
		return m, m.handleKeyMsg(typed)
	}
	return m, nil
}

func (m *model) handleKeyMsg(msg tea.KeyMsg) tea.Cmd {
	switch msg.String() {
	case "esc", "ctrl+c":
		return tea.Quit
	case " ", "enter":
		switch m.list {
		case 0:
			m.flavors[m.item].checked = !m.flavors[m.item].checked
		case 1:
			m.adds[m.item].checked = !m.adds[m.item].checked
		}
	case "up":
		if m.item > 0 {
			m.item--
		} else if m.list > 0 {
			m.list--
			m.item = len(m.flavors) - 1
		}
	case "down":
		switch m.list {
		case 0:
			if m.item+1 < len(m.flavors) {
				m.item++
			} else {
				m.list++
				m.item = 0
			}
		case 1:
			if m.item+1 < len(m.adds) {
				m.item++
			}
		}
	}
	return nil
}

func (m *model) View() string {
	curFlavor, curAdd := -1, -1
	switch m.list {
	case 0:
		curFlavor = m.item
	case 1:
		curAdd = m.item
	}
	return m.renderList("choose two flavors", m.flavors, curFlavor) +
		"\n" +
		m.renderList("select adds", m.adds, curAdd)
}

func (m *model) renderList(header string, items []item, selected int) string {
	out := "~ " + header + ":\n"
	for i, item := range items {
		sel := " "
		if i == selected {
			sel = ">"
		}
		check := " "
		if items[i].checked {
			check = "✓"
		}
		out += fmt.Sprintf("%s [%s] %s\n", sel, check, item.text)
	}
	return out
}