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package tui
import (
"math/rand/v2"
"strconv"
)
// Theme defines the shared color palette used across the TUI.
type Theme struct {
HeaderFG string
SelectedFG string
SelectedBG string
RowFG string
RowBG string
StatusFG string
StatusBG string
SearchFG string
SearchBG string
}
// DefaultTheme returns the baseline theme inspired by Task Samurai.
func DefaultTheme() Theme {
return Theme{
HeaderFG: "205",
SelectedFG: "229",
SelectedBG: "57",
RowFG: "15",
RowBG: "236",
StatusFG: "229",
StatusBG: "57",
SearchFG: "21",
SearchBG: "226",
}
}
// RandomTheme returns a randomized high-contrast palette for disco mode.
func RandomTheme() Theme {
theme := Theme{
HeaderFG: randomColor(),
SelectedBG: randomColor(),
RowBG: randomColor(),
StatusBG: randomColor(),
SearchBG: randomColor(),
}
theme.SelectedFG = contrastColor(theme.SelectedBG)
theme.RowFG = contrastColor(theme.RowBG)
theme.StatusFG = contrastColor(theme.StatusBG)
theme.SearchFG = contrastColor(theme.SearchBG)
return theme
}
func randomColor() string {
return strconv.Itoa(rand.IntN(256))
}
func contrastColor(background string) string {
value, err := strconv.Atoi(background)
if err != nil {
return "15"
}
if xtermBrightness(value) > 128 {
return "0"
}
return "15"
}
func xtermBrightness(index int) float64 {
red, green, blue := xtermRGB(index)
return 0.299*float64(red) + 0.587*float64(green) + 0.114*float64(blue)
}
func xtermRGB(index int) (int, int, int) {
if index < 0 {
index = 0
}
if index > 255 {
index = 255
}
if index < 16 {
table := [16][3]int{
{0, 0, 0}, {205, 0, 0}, {0, 205, 0}, {205, 205, 0},
{0, 0, 238}, {205, 0, 205}, {0, 205, 205}, {229, 229, 229},
{127, 127, 127}, {255, 0, 0}, {0, 255, 0}, {255, 255, 0},
{92, 92, 255}, {255, 0, 255}, {0, 255, 255}, {255, 255, 255},
}
rgb := table[index]
return rgb[0], rgb[1], rgb[2]
}
if index <= 231 {
index -= 16
red := (index / 36) * 51
green := (index % 36 / 6) * 51
blue := (index % 6) * 51
return red, green, blue
}
gray := (index-232)*10 + 8
return gray, gray, gray
}
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