// Package input provides a shell script interface for the text input bubble.
// https://github.com/charmbracelet/bubbles/tree/master/textinput
//
// It can be used to prompt the user for some input. The text the user entered
// will be sent to stdout.
//
// $ gum input --placeholder "What's your favorite gum?" > answer.text
package input

import (
	"github.com/charmbracelet/bubbles/help"
	"github.com/charmbracelet/bubbles/key"
	"github.com/charmbracelet/bubbles/textinput"
	tea "github.com/charmbracelet/bubbletea"
	"github.com/charmbracelet/lipgloss"
)

type keymap textinput.KeyMap

func defaultKeymap() keymap {
	k := textinput.DefaultKeyMap
	return keymap(k)
}

// FullHelp implements help.KeyMap.
func (k keymap) FullHelp() [][]key.Binding { return nil }

// ShortHelp implements help.KeyMap.
func (k keymap) ShortHelp() []key.Binding {
	return []key.Binding{
		key.NewBinding(
			key.WithKeys("enter"),
			key.WithHelp("enter", "submit"),
		),
	}
}

type model struct {
	autoWidth   bool
	header      string
	padding     []int
	headerStyle lipgloss.Style
	textinput   textinput.Model
	quitting    bool
	submitted   bool
	showHelp    bool
	help        help.Model
	keymap      keymap
}

func (m model) Init() tea.Cmd { return textinput.Blink }

func (m model) View() string {
	if m.quitting {
		return ""
	}
	var parts []string
	if m.header != "" {
		parts = append(parts, m.headerStyle.Render(m.header))
	}

	parts = append(parts, m.textinput.View())
	if m.showHelp {
		parts = append(parts, "", m.help.View(m.keymap))
	}
	return lipgloss.NewStyle().
		Padding(m.padding...).
		Render(lipgloss.JoinVertical(
			lipgloss.Top,
			parts...,
		))
}

func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
	switch msg := msg.(type) {
	case tea.WindowSizeMsg:
		if m.autoWidth {
			m.textinput.Width = msg.Width - 1 -
				lipgloss.Width(m.textinput.Prompt) -
				m.padding[1] - m.padding[3]
		}
	case tea.KeyMsg:
		switch msg.String() {
		case "ctrl+c":
			m.quitting = true
			return m, tea.Interrupt
		case "esc":
			m.quitting = true
			return m, tea.Quit
		case "enter":
			m.quitting = true
			m.submitted = true
			return m, tea.Quit
		}
	}

	var cmd tea.Cmd
	m.textinput, cmd = m.textinput.Update(msg)
	return m, cmd
}