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

tool_name="${1:?missing tool name}"
shift

script_dir="$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)"
root_dir="$(CDPATH= cd -- "${script_dir}/.." && pwd)"
target_prefix="${tool_name%-*}"

candidate_roots=()

for env_var in REDBEAR_REDOX_SYSROOT COOKBOOK_TOOLCHAIN REDOXER_TOOLCHAIN RUSTUP_TOOLCHAIN; do
    env_value="${!env_var:-}"
    if [ -n "${env_value}" ]; then
        candidate_roots+=("${env_value}")
    fi
done

candidate_roots+=("${root_dir}/prefix/${target_prefix}/sysroot")

for tool_root in "${candidate_roots[@]}"; do
    tool_path="${tool_root}/bin/${tool_name}"
    if [ -x "${tool_path}" ]; then
        exec "${tool_path}" "$@"
    fi
done

missing_root="${candidate_roots[0]}"
echo "error: missing toolchain binary: ${missing_root}/bin/${tool_name}" >&2
echo "hint: run 'make prefix' or otherwise populate ${missing_root}" >&2
exit 1