<?php
// +----------------------------------------------------------------------
// | SentCMS [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2024 http://www.tensent.cn All rights reserved.
// +----------------------------------------------------------------------
// | Author: molong <molong@tensent.cn> <http://www.tensent.cn>
// +----------------------------------------------------------------------
namespace App\Support;

class Tree {

	public static function list_to_tree($list, $root = 0, $pk = 'id', $pid = 'parent_id', $children = 'children') {
		// 创建Tree
		$tree = array();
		if (is_array($list)) {
			// 创建基于主键的数组引用
			$refer = array();
			foreach ($list as $key => $data) {
				$refer[$data[$pk]] = &$list[$key];
			}
			foreach ($list as $key => $data) {
				// 判断是否存在parent
				$parentId = 0;
				if (isset($data[$pid])) {
					$parentId = $data[$pid];
				}
				if ((string)$root == $parentId) {
					$tree[] = &$list[$key];
				} else {
					if (isset($refer[$parentId])) {
						$parent = &$refer[$parentId];
						$parent[$children][] = &$list[$key];
					}
				}
			}
		}
		return $tree;
	}

	public static function tree_to_list($tree = [], $children = 'children') {
		if (empty($tree) || !is_array($tree)) {
			return $tree;
		}
		$arrRes = [];
		foreach ($tree as $k => $v) {
			$arrTmp = $v;
			unset($arrTmp[$children]);
			$arrRes[] = $arrTmp;
			if (!empty($v[$children])) {
				$arrTmp = self::tree_to_list($v[$children], $children);
				$arrRes = array_merge($arrRes, $arrTmp);
			}
		}
		return $arrRes;
	}

	/**
	 * 获得所有的子
	 */
	public static function get_children($data, $id = 0, $pk = 'id', $pid = 'parent_id') {
		$array = [];
		foreach ($data as $k => $v) {
			if ($v[$pid] == $id) {
				$array[] = $v[$pk];
				array_merge($array, self::get_children($data, $v[$pk], $pk, $pid));
			}
		}
		return $array;
	}

	/**
	 * 获取id的所有父，包含自己
	 */
	public static function get_parents($data, $id = 0, $pk = 'id', $pid = 'parent_id', $field = '') {
		$temp = [];
		foreach ($data as $k => $v) {
			if ($v[$pk] == $id) {
				$temp[] = $v;
				$temp = array_merge($temp, self::get_parents($data, $v[$pid]), $pk, $pid, $field);
			}
		}
		if($field){
			$temp = array_column($temp, $field);
		}
		return $temp;
	}
}