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

ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
BUILD_SH="${ROOT_DIR}/build.sh"

usage() {
  cat <<'EOF'
Usage:
  ./build_arch.sh <arch> [--le|--be] [-- <extra build.sh args>]

Examples:
  ./build_arch.sh mips
  ./build_arch.sh mips.le
  ./build_arch.sh mips --be
  ./build_arch.sh riscv64
  ./build_arch.sh sparc.be -- --skip-fetch -d

Notes:
  - If <arch> has no endian suffix, default is ".le"
  - Use "--le" or "--be" to force endianness
  - Everything after "--" is passed to build.sh
EOF
}

if [[ $# -lt 1 ]]; then
  usage
  exit 1
fi

arch="$1"; shift || true

force_endian=""
extra_args=()

# Parse flags until optional "--"
while [[ $# -gt 0 ]]; do
  case "$1" in
    --le|--be)
      force_endian="${1#--}"
      shift
      ;;
    -h|--help)
      usage
      exit 0
      ;;
    --)
      shift
      extra_args+=("$@")
      break
      ;;
    *)
      # unknown flag -> treat as extra args (or enforce strict if you want)
      extra_args+=("$1")
      shift
      ;;
  esac
done

# Normalize arch -> ensure it matches CORES entries like "mips.le", "mips.be", "mips64.le", etc.
if [[ "$arch" == *.* ]]; then
  # Already has suffix (e.g. mips.le)
  normalized="$arch"
else
  # No suffix: apply forced endian or default to le
  if [[ -n "$force_endian" ]]; then
    normalized="${arch}.${force_endian}"
  else
    normalized="${arch}.le"
  fi
fi

# If user provided both "mips.le" and "--be", --be wins (optional behavior)
if [[ -n "$force_endian" ]]; then
  base="${normalized%%.*}"
  normalized="${base}.${force_endian}"
fi

if [[ ! -x "$BUILD_SH" ]]; then
  echo "Error: build.sh not found or not executable at: $BUILD_SH" >&2
  exit 1
fi

exec "$BUILD_SH" --external-lib-arch "$normalized" "${extra_args[@]}"