#!/usr/bin/env bash

set -Eeuo pipefail

if [ $# -lt 2 ]; then
  echo "Usage: $0 <source1> [source2 ...] <package_name>"
  return 1
fi

pkg="${@:$#}"
stowdir="$HOME/dotfiles"
sources=("${@:1:$#-1}")

mkdir -p "$stowdir/$pkg"

_stowify_convert_path() {
  local rel_path="$1"
  local IFS='/'
  local parts out_parts part

  read -ra parts <<<"$rel_path"
  for part in "${parts[@]}"; do
    if [[ $part == .* ]]; then
      out_parts+=("dot-${part#.}")
    else
      out_parts+=("$part")
    fi
  done

  local out=""
  for part in "${out_parts[@]}"; do
    if [ -z "$out" ]; then
      out="$part"
    else
      out="$out/$part"
    fi
  done
  printf '%s\n' "$out"
}

for src in "${sources[@]}"; do
  src="$(realpath -m "$src")" # expand to absolute path

  if [ ! -e "$src" ]; then
    echo "Error: $src does not exist"
    continue
  fi

  if [[ $src == "$HOME"/* ]]; then
    rel_path="${src#"$HOME"/}"
  else
    echo "Warning: $src is not under \$HOME — skipping"
    continue
  fi

  conv_rel_path="$(_stowify_convert_path "$rel_path")" || continue

  dest_path="$stowdir/$pkg/$conv_rel_path"
  dest_dir="$(dirname "$dest_path")"

  echo "$dest_dir"
  echo "$dest_path"

  mkdir -pv "$dest_dir" || {
    echo "Failed to create $dest_dir"
    continue
  }
  mv -v "$src" "$dest_path" || {
    echo "Failed to move $src"
    continue
  }
done

stow -d "$stowdir" -v --dotfiles "$pkg"