#!/bin/bash

set -euo pipefail

increment="$1"

_sed_i() {
  if [[ "$(uname)" == "Darwin" ]]; then
    sed -i '' "$@"
  else
    sed -i'' "$@"
  fi
}

# Update Alacritty
alacritty_config="$HOME/.config/alacritty/alacritty.toml"
current="$(grep opacity "$alacritty_config" | awk '{ print $3 }' || echo 1)"
changed="$(perl -MList::Util=min,max -e "print max(0, min(1, $current + $increment))")"
_sed_i 's/^opacity = .*$/opacity = '"$changed"'/' "$alacritty_config"

# Update Ghostty
ghostty_config="$HOME/.config/ghostty/config"
if [[ -f "$ghostty_config" ]]; then
  _sed_i 's/^background-opacity = .*$/background-opacity = '"$changed"'/' "$ghostty_config"

  # Trigger Ghostty reload
  script_dir="$(cd "$(dirname "$0")" && pwd)"
  "$script_dir/ghostty-reload"
fi

echo "$changed"