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

ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

BACKLIGHT_DEVICE="${BRIGHTNESS_BACKLIGHT_DEVICE:-intel_backlight}"
BACKLIGHT_PATH="${BRIGHTNESS_SYNC_BACKLIGHT:-/sys/class/backlight/${BACKLIGHT_DEVICE}}"
DDC_MODEL="${BRIGHTNESS_DDCUTIL_MODEL:-HG342PCB}"
DDC_DISPLAY="${BRIGHTNESS_DDCUTIL_DISPLAY:-1}"
DDC_BUS="${BRIGHTNESS_DDCUTIL_BUS:-16}"
STEP="${BRIGHTNESS_STEP:-10}"
INTERVAL="${BRIGHTNESS_SYNC_INTERVAL:-1}"
MIN_PERCENT="${BRIGHTNESS_SYNC_MIN_PERCENT:-1}"

install -d "$HOME/.local/bin"
install -d "$HOME/.config/systemd/user"
install -d "$HOME/.config/brightness-automation"

install -m 0755 "$ROOT/bin/brightness-osd" "$HOME/.local/bin/brightness-osd"
install -m 0755 "$ROOT/bin/brightness-up-all" "$HOME/.local/bin/brightness-up-all"
install -m 0755 "$ROOT/bin/brightness-down-all" "$HOME/.local/bin/brightness-down-all"
install -m 0755 "$ROOT/bin/brightness-sync-hg342pcb" "$HOME/.local/bin/brightness-sync-hg342pcb"
install -m 0644 "$ROOT/systemd/user/external-brightness-sync.service" "$HOME/.config/systemd/user/external-brightness-sync.service"

if [[ ! -f "$HOME/.config/brightness-automation/env" ]]; then
  cat >"$HOME/.config/brightness-automation/env" <<EOF
BRIGHTNESS_BACKLIGHT_DEVICE="$BACKLIGHT_DEVICE"
BRIGHTNESS_SYNC_BACKLIGHT="$BACKLIGHT_PATH"
BRIGHTNESS_OSD_BACKLIGHT="$BACKLIGHT_PATH"
BRIGHTNESS_STEP="$STEP"
BRIGHTNESS_DDCUTIL_MODEL="$DDC_MODEL"
BRIGHTNESS_DDCUTIL_DISPLAY="$DDC_DISPLAY"
BRIGHTNESS_DDCUTIL_BUS="$DDC_BUS"
BRIGHTNESS_SYNC_INTERVAL="$INTERVAL"
BRIGHTNESS_SYNC_MIN_PERCENT="$MIN_PERCENT"
BRIGHTNESS_OSD_VISIBLE_MS="1400"
EOF
fi

if [[ "${INSTALL_WLUMA_CONFIG:-0}" == "1" ]]; then
  install -d "$HOME/.config/wluma"
  install -m 0644 "$ROOT/wluma/config.toml" "$HOME/.config/wluma/config.toml"
fi

systemctl --user daemon-reload
systemctl --user enable --now external-brightness-sync.service

cat <<EOF
Installed.

Shortcuts:
  $HOME/.local/bin/brightness-down-all
  $HOME/.local/bin/brightness-up-all

Config:
  $HOME/.config/brightness-automation/env

Status:
  systemctl --user status external-brightness-sync.service
EOF