#!/usr/bin/env bash

# This file is part of I38.

# I38 is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation,
# either version 3 of the License, or (at your option) any later version.

# I38 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
# PURPOSE. See the GNU General Public License for more details.

# You should have received a copy of the GNU General Public License along with I38. If not, see <https://www.gnu.org/licenses/>.


# Not for multiple screens.
# Detect if we're on Wayland or X11
if [[ -n "${WAYLAND_DISPLAY}" ]]; then
    # Sway/Wayland: Get the name of the first output
    screenName="$(swaymsg -t get_outputs | jq -r '.[0].name')"
    if [[ -z "$screenName" ]]; then
        notify-send "Error: Could not detect output"
        exit 1
    fi
else
    # i3/X11: Get the name of the screen
    if ! command -v xrandr &> /dev/null; then
        notify-send "Error: xrandr not found"
        exit 1
    fi
    screenName="$(xrandr --query | grep "connected" | cut -d ' ' -f1 | head -n 1)"
fi

menuOptions=(
    "1.0" "Maximum Brightness"
    "0.75" "75 percent"
    "0.5" "50 percent"
    "0.25" "25 percent"
    "0" "Screen Curtain"
)

brightness="$(yad --list --title "I38" --text "Set Screen Brightness" --columns 2 --hide-column 1 --column "" --column "Select" "${menuOptions[@]}")"

if [[ ${#brightness} -lt 1 ]]; then
    exit 0
fi

# Apply brightness setting
if [[ -n "${WAYLAND_DISPLAY}" ]]; then
    # Sway: Use swaymsg to set output brightness
    # Note: Sway doesn't have native brightness control, using wlr-randr if available
    if command -v wlr-randr &> /dev/null; then
        wlr-randr --output "${screenName}" --brightness "${brightness%%|*}" &&
            spd-say -P important -Cw "Screen set to ${brightness#*|}."
    else
        # Fallback to gamma adjustment via wl-gammactl or brightnessctl
        if command -v brightnessctl &> /dev/null; then
            brightnessValue=$(echo "${brightness%%|*} * 100" | bc)
            brightnessctl set "${brightnessValue%.*}%" &&
                spd-say -P important -Cw "Screen set to ${brightness#*|}."
        else
            notify-send "Error: wlr-randr or brightnessctl required for Sway brightness control"
            exit 1
        fi
    fi
else
    # i3: Use xrandr
    xrandr --output "${screenName}" --brightness "${brightness%%|*}" &&
        spd-say -P important -Cw "Screen set to ${brightness#*|}."
fi

exit 0