light

#!/usr/bin/env bash
set -euo pipefail

# =============================================================================
# 🖥️  Display Brightness Controller
#     Interactive DDC/CI brightness control powered by ddcutil + gum
# =============================================================================

# --- Dependency Checks -------------------------------------------------------
for cmd in gum ddcutil; do
  if ! command -v "$cmd" &>/dev/null; then
    echo "ERROR: '$cmd' is not installed. Please install it first." >&2
    exit 1
  fi
done

# --- Dracula Color Palette ---------------------------------------------------
PINK="#FF79C6"
CYAN="#8BE9FD"
GREEN="#50FA7B"
YELLOW="#F1FA8C"
PURPLE="#BD93F9"
RED="#FF5555"
COMMENT="#6272A4"
FG="#F8F8F2"

# --- Header ------------------------------------------------------------------
clear
gum style \
  --border double \
  --margin "1" \
  --padding "1 4" \
  --align center \
  --foreground "$PINK" \
  "🖥️  Display Brightness Controller" \
  "" \
  "$(gum style --foreground "$CYAN" "ddcutil") $(gum style --foreground "$FG" "+") $(gum style --foreground "$GREEN" "gum")"

# --- Detect Displays ---------------------------------------------------------
gum style --foreground "$COMMENT" --margin "0 1" "🔍 Detecting DDC/CI capable displays..."

DISPLAYS=$(sudo ddcutil detect --brief 2>/dev/null | grep -E '^Display [0-9]+' | sed 's/://' || true)

if [ -z "$DISPLAYS" ]; then
  gum style --foreground "$YELLOW" --margin "1" "⚠️  Auto-detection failed (maybe sudo needs a password?)."
  gum style --foreground "$COMMENT" --margin "0 1" "Falling back to manual display list..."
  DISPLAYS="Display 1
Display 2"
fi

# Prepend "All displays" option
DISPLAYS="All displays
${DISPLAYS}"

# --- Select Display ----------------------------------------------------------
SELECTED=$(printf "%s\n" "$DISPLAYS" | gum choose \
  --header "$(gum style --foreground "$FG" "Select target display:")" \
  --cursor.foreground "$PINK")

if [ -z "$SELECTED" ]; then
  gum style --foreground "$RED" --margin "1" "No display selected. Exiting."
  exit 1
fi

# --- Resolve Target Display Numbers ------------------------------------------
if [ "$SELECTED" = "All displays" ]; then
  TARGETS=$(printf "%s\n" "$DISPLAYS" | grep -E '^Display [0-9]+' | grep -oE '[0-9]+')
else
  TARGETS=$(echo "$SELECTED" | grep -oE '[0-9]+')
fi

# --- Read Current Brightness -------------------------------------------------
FIRST_TARGET=$(echo "$TARGETS" | head -n1)
CURRENT_VAL=$(sudo ddcutil --display "$FIRST_TARGET" getvcp 10 2>/dev/null \
  | sed -n 's/.*current value = \([0-9]*\).*/\1/p' || true)

if [ -z "$CURRENT_VAL" ]; then
  CURRENT_VAL="50"
fi

# --- Input New Brightness ----------------------------------------------------
gum style --margin "1 0" --foreground "$PURPLE" \
  "Current brightness: $(gum style --bold --foreground "$YELLOW" "${CURRENT_VAL}%")"

NEW_VAL=$(gum input \
  --placeholder "Enter a value between 0 and 100" \
  --prompt "$(gum style --foreground "$GREEN" "➜ New brightness: ")" \
  --value "$CURRENT_VAL" \
  --width 30)

# --- Validate Input ----------------------------------------------------------
if ! [[ "$NEW_VAL" =~ ^[0-9]+$ ]] || [ "$NEW_VAL" -lt 0 ] || [ "$NEW_VAL" -gt 100 ]; then
  gum style --foreground "$RED" --margin "1" "❌ Invalid input: '$NEW_VAL'. Must be an integer between 0 and 100."
  exit 1
fi

# --- Confirmation ------------------------------------------------------------
if ! gum confirm \
  --affirmative "Apply ${NEW_VAL}%" \
  --negative "Cancel" \
  "Set brightness to ${NEW_VAL}%?"; then
  gum style --foreground "$COMMENT" "Cancelled."
  exit 0
fi

# --- Apply Brightness --------------------------------------------------------
FAILED=0
while IFS= read -r num; do
  [ -z "$num" ] && continue

  if ! gum spin \
    --spinner pulse \
    --title "$(gum style --foreground "$CYAN" "Updating Display $num → ${NEW_VAL}%...")" \
    --show-output \
    -- sudo ddcutil --display "$num" setvcp 10 "$NEW_VAL"; then

    gum style --foreground "$RED" "❌ Failed to update Display $num."
    FAILED=$((FAILED + 1))
  fi
done <<< "$TARGETS"

# --- Success / Failure Summary -----------------------------------------------
if [ "$FAILED" -eq 0 ]; then
  gum style \
    --border rounded \
    --margin "1" \
    --padding "1 4" \
    --align center \
    --foreground "$GREEN" \
    "✨ Brightness updated successfully!" \
    "" \
    "$(gum style --foreground "$FG" "All selected displays are now at ")$(gum style --bold --foreground "$PINK" "${NEW_VAL}%")"
else
  gum style --foreground "$YELLOW" --margin "1" "⚠️  $FAILED display(s) could not be updated."
fi