#!/bin/bash

# Configure the Plymouth boot theme with a custom background color, accent color, and logo.
# Stages the change in a temp dir, previews it as a composited image, then optionally
# commits the staged files to /usr/share and rebuilds the initramfs.

if [[ $# -ne 3 ]]; then
  echo "Usage: omarchy-theme-set-plymouth <background-hex> <accent-hex> <path-to-logo.png>" >&2
  exit 1
fi

bg_hex="${1#\#}"
accent_hex="${2#\#}"
logo_path="$3"

if ! [[ $bg_hex =~ ^[0-9a-fA-F]{6}$ ]]; then
  echo "Invalid background color: $1 (expected #RRGGBB)" >&2
  exit 1
fi

if ! [[ $accent_hex =~ ^[0-9a-fA-F]{6}$ ]]; then
  echo "Invalid accent color: $2 (expected #RRGGBB)" >&2
  exit 1
fi

if [[ ! -f $logo_path ]]; then
  echo "Logo file not found: $logo_path" >&2
  exit 1
fi

bg_r=$(awk -v n=$((16#${bg_hex:0:2})) 'BEGIN{printf "%.3f", n/255}')
bg_g=$(awk -v n=$((16#${bg_hex:2:2})) 'BEGIN{printf "%.3f", n/255}')
bg_b=$(awk -v n=$((16#${bg_hex:4:2})) 'BEGIN{printf "%.3f", n/255}')

theme_dir="/usr/share/plymouth/themes/omarchy"
staging_dir=$(mktemp -d)
preview_png=$(mktemp --suffix=.png)
trap 'rm -rf "$staging_dir" "$preview_png"' EXIT

cp ~/.local/share/omarchy/default/plymouth/* "$staging_dir/"
cp "$logo_path" "$staging_dir/logo.png"

sed -i \
  -e "s/^Window.SetBackgroundTopColor.*/Window.SetBackgroundTopColor($bg_r, $bg_g, $bg_b);/" \
  -e "s/^Window.SetBackgroundBottomColor.*/Window.SetBackgroundBottomColor($bg_r, $bg_g, $bg_b);/" \
  "$staging_dir/omarchy.script"

for asset in bullet.png entry.png lock.png progress_bar.png; do
  magick "$staging_dir/$asset" -channel RGB +level-colors "#$accent_hex","#$accent_hex" "$staging_dir/$asset"
done

if gum confirm "Preview new login screen?"; then
  canvas_w=1920
  canvas_h=1080

  logo_w=$(magick identify -format '%w' "$staging_dir/logo.png")
  logo_h=$(magick identify -format '%h' "$staging_dir/logo.png")
  entry_w=$(magick identify -format '%w' "$staging_dir/entry.png")
  entry_h=$(magick identify -format '%h' "$staging_dir/entry.png")
  lock_h=$(awk "BEGIN{print int($entry_h * 0.8)}")
  lock_w=$(awk "BEGIN{print int(84 * $lock_h / 96)}")

  logo_x=$(( (canvas_w - logo_w) / 2 ))
  logo_y=$(( (canvas_h - logo_h) / 2 ))
  entry_x=$(( (canvas_w - entry_w) / 2 ))
  entry_y=$(( logo_y + logo_h + 40 ))
  lock_x=$(( entry_x - lock_w - 15 ))
  lock_y=$(( entry_y + entry_h/2 - lock_h/2 ))
  bullet_y=$(( entry_y + entry_h/2 - 4 ))

  bullet_args=()
  for i in 0 1 2 3; do
    bx=$(( entry_x + 20 + i * 12 ))
    bullet_args+=( '(' "$staging_dir/bullet.png" -resize 7x7 ')' -geometry +${bx}+${bullet_y} -composite )
  done

  magick -size ${canvas_w}x${canvas_h} "xc:#$bg_hex" \
    "$staging_dir/logo.png" -geometry +${logo_x}+${logo_y} -composite \
    "$staging_dir/entry.png" -geometry +${entry_x}+${entry_y} -composite \
    \( "$staging_dir/lock.png" -resize ${lock_w}x${lock_h} \) -geometry +${lock_x}+${lock_y} -composite \
    "${bullet_args[@]}" \
    "$preview_png"

  imv -f "$preview_png"
fi

if gum confirm "Apply new login screen?"; then
  sudo cp -a "$staging_dir/." "$theme_dir/"
  sudo plymouth-set-default-theme omarchy

  if omarchy-cmd-present limine-mkinitcpio; then
    sudo limine-mkinitcpio
  else
    sudo mkinitcpio -P
  fi
fi