#!/bin/sh

while [ "$#" -gt 0 ]; do
  case $1 in
    -h|-?|--help|help)
      HELP=1
      ;;
    -*)
      echo "Error: Unsupported flag $1" >&2
      return 1
      ;;
    *)  # No more options
      break
      ;;
  esac
  shift
done

if [ "$HELP" ]; then
  printf "\
usage %s <path/to/Cargoctoml>\n
  -?|-h|--help\tthis message
" "$(basename "$0")"
  exit
fi

generate_combinations() {
    items="$1"
    size=$2
    current=$3
    combination="$4"

    if [ "$current" -eq "$size" ]; then
        echo "$combination"
        return
    fi

    # Split items into positional parameters
    set -- $items
    while [ $# -gt 0 ]; do
        item=$1
        shift
        new_combination="$combination $item"
        remaining_items="$@"
        generate_combinations "$remaining_items" $size $(($current + 1)) "$new_combination"
        set -- "$item" $@
    done
}

CARGO_PATH="$1"

if [ -z "$CARGO_PATH" ]; then
    printf "please provide path to Cargo.toml\n"
    exit
fi

if [ -d "$CARGO_PATH" ]; then
    CARGO_PATH="${CARGO_PATH}/Cargo.toml"
fi

features=$(grep '^\[features\]' "$CARGO_PATH" -A99999999 | grep '^\[' -m 2 -B99999999 | grep -v '^\[' | cut -d '=' -f 1 | grep -v 'default')
num_features=$(echo "$features" | wc -w | tr -d ' ')



i=1
while [ $i -le $num_features ]; do
    echo "Generating combinations of size $i"
    combos=$(generate_combinations "$features" $i 0 "")
    echo "$combos" | while IFS= read -r line; do
        combo=$(echo $line | xargs) # Trim
        echo "Running clippy with features: $combo"
        if ! cargo clippy --features "$combo"; then
            echo "Error found in combination: $combo"
            exit 1
        fi
    done
    i=$((i + 1))
done