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

# Generates a multi-size favicon.ico from public/favicon.svg
# Dependencies:
#   - rsvg-convert (from librsvg)
#   - ImageMagick (magick)
# macOS install:
#   brew install librsvg imagemagick

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
ROOT_DIR="$(cd "${SCRIPT_DIR}/.." && pwd)"
SVG_PATH="${ROOT_DIR}/public/favicon.svg"
OUT_ICO_PATH="${ROOT_DIR}/public/favicon.ico"

if ! command -v rsvg-convert >/dev/null 2>&1; then
  echo "ERROR: rsvg-convert not found. Install with: brew install librsvg" >&2
  exit 1
fi
if ! command -v magick >/dev/null 2>&1; then
  echo "ERROR: ImageMagick (magick) not found. Install with: brew install imagemagick" >&2
  exit 1
fi

tmp_dir="$(mktemp -d)"
cleanup() { rm -rf "${tmp_dir}"; }
trap cleanup EXIT

sizes=(16 32 48 64)
pngs=()
for s in "${sizes[@]}"; do
  out_png="${tmp_dir}/favicon-${s}.png"
  rsvg-convert -w "${s}" -h "${s}" "${SVG_PATH}" -o "${out_png}"
  pngs+=("${out_png}")
done

magick "${pngs[@]}" "${OUT_ICO_PATH}"
echo "Generated ${OUT_ICO_PATH}"