package lipgloss

import (
	"strconv"

	"github.com/muesli/termenv"
)

// TerminalColor is a color intended to be rendered in the terminal.
type TerminalColor interface {
	RGBA() (r, g, b, a uint32)
}

// NoColor is used to specify the absence of color styling. When this is active
// foreground colors will be rendered with the terminal's default text color,
// and background colors will not be drawn at all.
//
// Example usage:
//
//	var style = someStyle.Copy().Background(lipgloss.NoColor{})
type NoColor struct{}

var noColor = NoColor{}

// RGBA returns the RGBA value of this color. Because we have to return
// something, despite this color being the absence of color, we're returning
// black with 100% opacity.
//
// Red: 0x0, Green: 0x0, Blue: 0x0, Alpha: 0xFFFF.
func (n NoColor) RGBA() (r, g, b, a uint32) {
	return 0x0, 0x0, 0x0, 0xFFFF
}

// Color specifies a color by hex or ANSI value. For example:
//
//	ansiColor := lipgloss.Color("21")
//	hexColor := lipgloss.Color("#0000ff")
type Color string

func (c Color) color() termenv.Color {
	return ColorProfile().Color(string(c))
}

// RGBA returns the RGBA value of this color. This satisfies the Go Color
// interface. Note that on error we return black with 100% opacity, or:
//
// Red: 0x0, Green: 0x0, Blue: 0x0, Alpha: 0xFFFF.
func (c Color) RGBA() (r, g, b, a uint32) {
	return termenv.ConvertToRGB(c.color()).RGBA()
}

// ANSIColor is a color specified by an ANSI color value. It's merely syntactic
// sugar for the more general Color function. Invalid colors will render as
// black.
//
// Example usage:
//
//	// These two statements are equivalent.
//	colorA := lipgloss.ANSIColor(21)
//	colorB := lipgloss.Color("21")
type ANSIColor uint

// RGBA returns the RGBA value of this color. This satisfies the Go Color
// interface. Note that on error we return black with 100% opacity, or:
//
// Red: 0x0, Green: 0x0, Blue: 0x0, Alpha: 0xFFFF.
func (ac ANSIColor) RGBA() (r, g, b, a uint32) {
	cf := Color(strconv.FormatUint(uint64(ac), 10))
	return cf.RGBA()
}

// AdaptiveColor provides color options for light and dark backgrounds. The
// appropriate color will be returned at runtime based on the darkness of the
// terminal background color.
//
// Example usage:
//
//	color := lipgloss.AdaptiveColor{Light: "#0000ff", Dark: "#000099"}
type AdaptiveColor struct {
	Light string
	Dark  string
}

func (ac AdaptiveColor) value() string {
	if HasDarkBackground() {
		return ac.Dark
	}
	return ac.Light
}

func (ac AdaptiveColor) color() termenv.Color {
	return ColorProfile().Color(ac.value())
}

// RGBA returns the RGBA value of this color. This satisfies the Go Color
// interface. Note that on error we return black with 100% opacity, or:
//
// Red: 0x0, Green: 0x0, Blue: 0x0, Alpha: 0xFFFF.
func (ac AdaptiveColor) RGBA() (r, g, b, a uint32) {
	return termenv.ConvertToRGB(ac.color()).RGBA()
}

// CompleteColor specifies exact values for truecolor, ANSI256, and ANSI color
// profiles. Automatic color degradation will not be performed.
type CompleteColor struct {
	TrueColor string
	ANSI256   string
	ANSI      string
}

func (c CompleteColor) value() string {
	switch ColorProfile() {
	case termenv.TrueColor:
		return c.TrueColor
	case termenv.ANSI256:
		return c.ANSI256
	case termenv.ANSI:
		return c.ANSI
	default:
		return ""
	}
}

func (c CompleteColor) color() termenv.Color {
	return ColorProfile().Color(c.value())
}

// RGBA returns the RGBA value of this color. This satisfies the Go Color
// interface. Note that on error we return black with 100% opacity, or:
//
// Red: 0x0, Green: 0x0, Blue: 0x0, Alpha: 0xFFFF.
func (c CompleteColor) RGBA() (r, g, b, a uint32) {
	return termenv.ConvertToRGB(c.color()).RGBA()
}

// CompleteAdaptiveColor specifies exact values for truecolor, ANSI256, and ANSI color
// profiles, with separate options for light and dark backgrounds. Automatic
// color degradation will not be performed.
type CompleteAdaptiveColor struct {
	Light CompleteColor
	Dark  CompleteColor
}

func (cac CompleteAdaptiveColor) value() string {
	if HasDarkBackground() {
		return cac.Dark.value()
	}
	return cac.Light.value()
}

func (cac CompleteAdaptiveColor) color() termenv.Color {
	return ColorProfile().Color(cac.value())
}

// RGBA returns the RGBA value of this color. This satisfies the Go Color
// interface. Note that on error we return black with 100% opacity, or:
//
// Red: 0x0, Green: 0x0, Blue: 0x0, Alpha: 0xFFFF.
func (cac CompleteAdaptiveColor) RGBA() (r, g, b, a uint32) {
	return termenv.ConvertToRGB(cac.color()).RGBA()
}