package common

import (
	"strings"

	"charm.land/lipgloss/v2"
	"github.com/charmbracelet/crush/internal/ui/styles"
)

// ButtonOpts defines the configuration for a single button
type ButtonOpts struct {
	// Text is the button label
	Text string
	// UnderlineIndex is the 0-based index of the character to underline (-1 for none)
	UnderlineIndex int
	// Selected indicates whether this button is currently selected
	Selected bool
	// Padding inner horizontal padding defaults to 2 if this is 0
	Padding int
}

// Button creates a button with an underlined character and selection state
func Button(t *styles.Styles, opts ButtonOpts) string {
	// Select style based on selection state
	style := t.ButtonBlur
	if opts.Selected {
		style = t.ButtonFocus
	}

	text := opts.Text
	if opts.Padding == 0 {
		opts.Padding = 2
	}

	// the index is out of bound
	if opts.UnderlineIndex > -1 && opts.UnderlineIndex > len(text)-1 {
		opts.UnderlineIndex = -1
	}

	text = style.Padding(0, opts.Padding).Render(text)

	if opts.UnderlineIndex != -1 {
		text = lipgloss.StyleRanges(text, lipgloss.NewRange(opts.Padding+opts.UnderlineIndex, opts.Padding+opts.UnderlineIndex+1, style.Underline(true)))
	}

	return text
}

// ButtonGroup creates a row of selectable buttons
// Spacing is the separator between buttons
// Use "  " or similar for horizontal layout
// Use "\n"  for vertical layout
// Defaults to "  " (horizontal)
func ButtonGroup(t *styles.Styles, buttons []ButtonOpts, spacing string) string {
	if len(buttons) == 0 {
		return ""
	}

	if spacing == "" {
		spacing = "  "
	}

	parts := make([]string, len(buttons))
	for i, button := range buttons {
		parts[i] = Button(t, button)
	}

	return strings.Join(parts, spacing)
}