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package ui
import (
"math"
"math/rand"
"strconv"
)
// Theme holds color configuration for the UI.
type Theme struct {
HeaderFG string
SelectedFG string
SelectedBG string
RowFG string
RowBG string
StatusFG string
StatusBG string
StartBG string
UltraStartedBG string // background for started tasks in ultra mode
OverdueBG string
PrioLowBG string
PrioMedBG string
PrioHighBG string
SearchFG string
SearchBG string
}
// DefaultTheme returns the color theme used by Task Samurai.
func DefaultTheme() Theme {
return Theme{
HeaderFG: "75", // steel blue — labels in ultra cards
SelectedFG: "255", // bright white — text on selected card
SelectedBG: "238", // dark grey — clean selection highlight on black background
RowFG: "0",
RowBG: "57",
StatusFG: "229", // light yellow
StatusBG: "57", // dark purple — status bar background
StartBG: "6",
UltraStartedBG: "220", // amber yellow — visually distinct "in progress" indicator
OverdueBG: "1",
PrioLowBG: "28", // dark green — subtler than bright 10
PrioMedBG: "33", // medium blue — subtler than bright 12
PrioHighBG: "160", // dark red — subtler than bright 9
SearchFG: "16",
SearchBG: "220", // amber — easier on eyes than pure yellow 226
}
}
func RandomTheme() Theme {
th := Theme{
HeaderFG: randColor(),
SelectedBG: randColor(),
RowBG: randColor(),
StatusBG: randColor(),
StartBG: randColor(),
UltraStartedBG: randColor(),
OverdueBG: randColor(),
PrioLowBG: randColor(),
PrioMedBG: randColor(),
PrioHighBG: randColor(),
SearchBG: randColor(),
}
th.SelectedFG = contrastColor(th.SelectedBG)
th.RowFG = contrastColor(th.RowBG)
th.StatusFG = contrastColor(th.StatusBG)
th.SearchFG = contrastColor(th.SearchBG)
return th
}
func randColor() string {
return strconv.Itoa(rand.Intn(256))
}
func contrastColor(bg string) string {
i, err := strconv.Atoi(bg)
if err != nil || i < 0 || i > 255 {
return "15"
}
r, g, b := xtermRGB(i)
if contrastRatio(r, g, b, 0, 0, 0) >= contrastRatio(r, g, b, 255, 255, 255) {
return "0"
}
return "15"
}
func contrastRatio(r1, g1, b1, r2, g2, b2 int) float64 {
l1 := relativeLuminance(r1, g1, b1)
l2 := relativeLuminance(r2, g2, b2)
if l1 < l2 {
l1, l2 = l2, l1
}
return (l1 + 0.05) / (l2 + 0.05)
}
func relativeLuminance(r, g, b int) float64 {
return 0.2126*linearizeColorChannel(r) +
0.7152*linearizeColorChannel(g) +
0.0722*linearizeColorChannel(b)
}
func linearizeColorChannel(v int) float64 {
c := float64(v) / 255.0
if c <= 0.04045 {
return c / 12.92
}
return math.Pow((c+0.055)/1.055, 2.4)
}
func xtermRGB(i int) (int, int, int) {
if i < 16 {
var 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[i]
return rgb[0], rgb[1], rgb[2]
}
if i >= 16 && i <= 231 {
i -= 16
r := (i / 36) * 51
g := (i % 36 / 6) * 51
b := (i % 6) * 51
return r, g, b
}
v := (i-232)*10 + 8
return v, v, v
}
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