#!/bin/bash

CURDIR="$(realpath "$(dirname "$0")")"

. "${CURDIR}/../utils/sh/log.sh"
log "enable logging"

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

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 '^\[features\]' $1 -A99999999 | grep '^\[' -m 2 -B99999999 | grep -v '^\[' | cut -d '=' -f 1 | grep -v 'default')


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

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

    for ((i = 0; i < ${#items[@]}; ++i)); do
        new_combination="$combination ${items[$i]}"
        remaining_items=("${items[@]:0:$i}" "${items[@]:$((i + 1))}")
        generate_combinations "$(IFS=" "; echo "${remaining_items[*]}")" $size $((current + 1)) "$new_combination"
    done
}

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