package textinput

import (
	"image/color"
	"time"

	tea "github.com/charmbracelet/bubbletea/v2"
	"github.com/charmbracelet/lipgloss/v2"
)

// DefaultStyles returns the default styles for focused and blurred states for
// the textarea.
func DefaultStyles(isDark bool) Styles {
	lightDark := lipgloss.LightDark(isDark)

	var s Styles
	s.Focused = StyleState{
		Placeholder: lipgloss.NewStyle().Foreground(lipgloss.Color("240")),
		Suggestion:  lipgloss.NewStyle().Foreground(lipgloss.Color("240")),
		Prompt:      lipgloss.NewStyle().Foreground(lipgloss.Color("7")),
		Text:        lipgloss.NewStyle(),
	}
	s.Blurred = StyleState{
		Placeholder: lipgloss.NewStyle().Foreground(lipgloss.Color("240")),
		Suggestion:  lipgloss.NewStyle().Foreground(lipgloss.Color("240")),
		Prompt:      lipgloss.NewStyle().Foreground(lipgloss.Color("7")),
		Text:        lipgloss.NewStyle().Foreground(lightDark(lipgloss.Color("245"), lipgloss.Color("7"))),
	}
	s.Cursor = CursorStyle{
		Color: lipgloss.Color("7"),
		Shape: tea.CursorBlock,
		Blink: true,
	}
	return s
}

// DefaultLightStyles returns the default styles for a light background.
func DefaultLightStyles() Styles {
	return DefaultStyles(false)
}

// DefaultDarkStyles returns the default styles for a dark background.
func DefaultDarkStyles() Styles {
	return DefaultStyles(true)
}

// Styles are the styles for the textarea, separated into focused and blurred
// states. The appropriate styles will be chosen based on the focus state of
// the textarea.
type Styles struct {
	Focused StyleState
	Blurred StyleState
	Cursor  CursorStyle
}

// StyleState that will be applied to the text area.
//
// StyleState can be applied to focused and unfocused states to change the styles
// depending on the focus state.
//
// For an introduction to styling with Lip Gloss see:
// https://github.com/charmbracelet/lipgloss
type StyleState struct {
	Text        lipgloss.Style
	Placeholder lipgloss.Style
	Suggestion  lipgloss.Style
	Prompt      lipgloss.Style
}

// CursorStyle is the style for real and virtual cursors.
type CursorStyle struct {
	// Style styles the cursor block.
	//
	// For real cursors, the foreground color set here will be used as the
	// cursor color.
	Color color.Color

	// Shape is the cursor shape. The following shapes are available:
	//
	// - tea.CursorBlock
	// - tea.CursorUnderline
	// - tea.CursorBar
	//
	// This is only used for real cursors.
	Shape tea.CursorShape

	// CursorBlink determines whether or not the cursor should blink.
	Blink bool

	// BlinkSpeed is the speed at which the virtual cursor blinks. This has no
	// effect on real cursors as well as no effect if the cursor is set not to
	// [CursorBlink].
	//
	// By default, the blink speed is set to about 500ms.
	BlinkSpeed time.Duration
}