<?php

declare(strict_types=1);

namespace SPC\builder\traits;

/**
 * Unix 系统的工具函数 Trait，适用于 Linux、macOS
 */
trait UnixSystemUtilTrait
{
    /**
     * 生成 toolchain.cmake，用于 cmake 构建
     *
     * @param string      $os          操作系统代号
     * @param string      $target_arch 目标架构
     * @param string      $cflags      CFLAGS 参数
     * @param null|string $cc          CC 参数（默认空）
     * @param null|string $cxx         CXX 参数（默认空）
     */
    public static function makeCmakeToolchainFile(
        string $os,
        string $target_arch,
        string $cflags,
        ?string $cc = null,
        ?string $cxx = null
    ): string {
        logger()->debug("making cmake tool chain file for {$os} {$target_arch} with CFLAGS='{$cflags}'");
        $root = BUILD_ROOT_PATH;
        $ccLine = '';
        if ($cc) {
            $ccLine = 'SET(CMAKE_C_COMPILER ' . self::findCommand($cc) . ')';
        }
        $cxxLine = '';
        if ($cxx) {
            $cxxLine = 'SET(CMAKE_CXX_COMPILER ' . self::findCommand($cxx) . ')';
        }
        $toolchain = <<<CMAKE
SET(CMAKE_SYSTEM_NAME {$os})
SET(CMAKE_SYSTEM_PROCESSOR {$target_arch})
{$ccLine}
{$cxxLine}
SET(CMAKE_C_FLAGS "{$cflags}")
SET(CMAKE_CXX_FLAGS "{$cflags}")
SET(CMAKE_FIND_ROOT_PATH "{$root}")
CMAKE;
        file_put_contents(SOURCE_PATH . '/toolchain.cmake', $toolchain);
        return realpath(SOURCE_PATH . '/toolchain.cmake');
    }

    /**
     * @param  string      $name  命令名称
     * @param  array       $paths 寻找的目标路径（如果不传入，则使用环境变量 PATH）
     * @return null|string 找到了返回命令路径，找不到返回 null
     */
    public static function findCommand(string $name, array $paths = []): ?string
    {
        if (!$paths) {
            $paths = explode(PATH_SEPARATOR, getenv('PATH'));
        }
        foreach ($paths as $path) {
            if (file_exists($path . DIRECTORY_SEPARATOR . $name)) {
                return $path . DIRECTORY_SEPARATOR . $name;
            }
        }
        return null;
    }
}