#!/usr/bin/env bash
# Locate Android NDK root for the project. Source this file.
# Usage: export ANDROID_NDK_HOME="$(androidcast_find_ndk_root "$ROOT")"

androidcast_find_ndk_root() {
  local project_root="${1:-$PWD}"
  local lp="$project_root/local.properties"

  # Prefer local.properties ndk.dir
  if [[ -f "$lp" ]]; then
    local ndk_dir
    ndk_dir="$(grep '^ndk\.dir=' "$lp" 2>/dev/null | cut -d= -f2 | tr -d '[:space:]')"
    if [[ -n "$ndk_dir" && -d "$ndk_dir" ]]; then
      echo "$ndk_dir"
      return 0
    fi
  fi

  # ANDROID_NDK_HOME / ANDROID_NDK_ROOT env
  for v in "${ANDROID_NDK_HOME:-}" "${ANDROID_NDK_ROOT:-}"; do
    if [[ -n "$v" && -d "$v" ]]; then
      echo "$v"
      return 0
    fi
  done

  # Search SDK
  local sdk_root="${ANDROID_HOME:-${ANDROID_SDK_ROOT:-$HOME/Android/Sdk}}"
  if [[ -d "$sdk_root/ndk" ]]; then
    # Prefer NDK 29, then highest available
    for preferred in 29 28 27 26; do
      local match
      match="$(ls "$sdk_root/ndk" 2>/dev/null | grep "^${preferred}\." | sort -V | tail -1)"
      if [[ -n "$match" && -d "$sdk_root/ndk/$match" ]]; then
        echo "$sdk_root/ndk/$match"
        return 0
      fi
    done
    local latest
    latest="$(ls "$sdk_root/ndk" 2>/dev/null | sort -V | tail -1)"
    if [[ -n "$latest" && -d "$sdk_root/ndk/$latest" ]]; then
      echo "$sdk_root/ndk/$latest"
      return 0
    fi
  fi

  echo "ERROR: Android NDK not found. Install via Android Studio SDK Manager or set ANDROID_NDK_HOME." >&2
  return 1
}