<?php
/**
 * Created by PhpStorm.
 * User: NullFeng
 * Date: 2017年12月22日
 * Time: 14:31
 */

namespace utils;

class ListModel
{
 /**
 * 数据源
 */
 private $dataSource;
 /**
 * 列表头
 */
 private $header;
 /**
 * 列表项
 */
 private $rows;
 /**
 * 自定义按钮
 */
 private $customs;
 /**
 * 自定义按钮的列名
 */
 private $custom_header = ['title' => '操作'];

 /**
 * 设置数据源
 * @param $dataSource
 * @return $this
 */
 public function setDataSource($dataSource)
 {
 $this->dataSource = $dataSource;
 return $this;
 }

 /**
 * 添加列
 * @param $name
 * @param $title
 * @param array $option
 * @return $this
 */
 public function addColumn($name, $title, $option = array())
 {
 $pos = strpos($name, ' as ');
 if ($pos !== false) {
 $ref = substr($name, 0, $pos);
 $name = substr($name, $pos + 1);
 $option['ref'] = $ref;
 }
 $this->header[$name] = array(
 'title' => $title,
 'option' => $option
 );
 return $this;
 }

 /**
 * 添加列
 */
 public function setCustomHeader($title, $option = array())
 {
 $this->custom_header = array(
 'title' => $title,
 'option' => $option
 );
 return $this;
 }

 /**
 * 添加自定义按钮
 */
 public function addCustom($title, $url, $option = array())
 {
 $button = array(
 'title' => $title,
 'url' => $url,
 'option' => $option
 );
 !empty($this->customs) || $this->header['__custom'] = &$this->custom_header;
 $this->customs[] = $button;
 return $this;
 }

 /**
 * 解析条件表达式
 */
 private function parse_expression($str, $scope)
 {
 $matches = [];
 preg_match_all("/\\$\\{[a-zA-Z_]+[0-9_]*\\}/", $str, $matches);
 foreach ($matches[0] as $k => $v) {
 $matches[0][$k] = substr($v, 2, strlen($v) - 3);
 }
 foreach ($matches[0] as $k => $v) {
 $str = str_replace('${' . $v . '}', '$scope[\'' . $v . '\']', $str);
 }
 $result = false;
 eval('$result = ' . $str . ";");
 return $result;
 }

 /**
 * 解析 带函数的变量
 * @param $str 含有变量的模板字符串
 * @param $scope 其中变量所在的集合作用域数组
 * @return mixed 解析之后的字符串
 */
 private function parse_vars($str, $scope)
 {
 $matches = [];
 preg_match_all('/\$\{[^$]*\}/', $str, $matches);
 $vars = $matches[0];
 foreach ($vars as $k => $v) {
 $temp = [];
 $result = "";
 preg_match('/\$\{[^$^|]*/', $v, $temp);
 $name = substr($temp[0], 2);
 $flag = strpos($v, '|');
 if ($flag !== false) {//没有函数调用
 $len = strlen($v);
 $fn = substr($v, $flag + 1, $len - 2 - $flag);
 $flag = strpos($fn, '=');
 if ($flag === false) {//没有参数
 $result = $fn($scope[$name]);
 } else {
 $args_str = substr($fn, $flag + 1);
 $fn = substr($fn, 0, $flag);
 $args_str = str_replace('\,円', '&d;', $args_str);
 $args = explode(',', $args_str);
 foreach ($args as $key => $value) {
 if ($value == "###") {
 $args[$key] = $scope[$name];
 } else {
 $args[$key] = str_replace('&d;', ',', $value);
 }
 }
 switch (count($args)) {
 case 1:
 $result = $fn($args[0]);
 break;
 case 2:
 $result = $fn($args[0], $args[1]);
 break;
 case 3:
 $result = $fn($args[0], $args[1], $args[2]);
 break;
 }
 }
 } else {
 $name = substr($name, 0, strlen($name) - 1);
 $result = $scope[$name];
 }
 $str = str_replace($v, $result, $str);
 }
 return $str;
 }

 /**
 * 枚举
 */
 private function parse_enum($params, $value)
 {
 if (is_array($params)) {
 if (isset($params[$value])) {
 $value = $params[$value];
 } else {
 if (isset($params['_default'])) {
 $value = $params['_default'];
 }
 }
 }
 return $value;
 }

 /**
 * 获取头部
 */
 public function getHeaders()
 {
 return $this->header;
 }

 /**
 * 生成数据
 */
 public function fetchRows()
 {
 //处理数据源
 foreach ($this->dataSource as $row_key => $row) {
 foreach ($this->header as $col_key => $column) {
 //根据表头处理ref引用列
 if (!isset($row[$col_key])) {
 if (isset($column['option']['ref']) && isset($row[$column['option']['ref']])) {
 $row[$col_key] = $row[$column['option']['ref']];
 } else {
 $row[$col_key] = "";
 }
 }
 if ($col_key == '__custom' && !empty($this->customs)) {
 //处理自定义按钮
 $custom_html = "";
 foreach ($this->customs as $ctm_key => $custom) {
 if (isset($custom['option'])) {
 $option = $custom['option'];
 //解析条件表达式
 if (isset($option['show']) && is_string($option['show'])) {
 if (!self::parse_expression($option['show'], $row))
 continue;
 }
 $tag = isset($option['tag']) ? $option['tag'] : 'a';
 $attr = isset($option['attr']) ? $option['attr'] : [];
 $class_str = isset($option['class']) ? 'class="' . $option['class'] . '" ' : '';
 $url = isset($custom['url']) ? $custom['url'] : '';
 $url = urldecode($url);
 $title = $custom['title'];
 //处理自定义属性
 $attr_html = "";
 foreach ($attr as $k => $v) {
 if ($k == "class" && !empty($class_str))
 continue;
 $attr_html .= "$k='$v' ";
 }
 switch ($tag) {
 case 'a':
 $custom_html .= "<$tag$attr_html$class_str href='$url'>$title</$tag>";
 break;
 case 'input':
 $custom_html .= "<$tag$attr_html$class_str type='button' onclick='$url' value='$title' />";
 break;
 default:
 $custom_html .= "<$tag$attr_html$class_str onclick='$url'>$title</$tag>";
 break;
 }
 }
 }
 if (!empty($custom_html)) {
 $custom_html = self::parse_vars($custom_html, $row);
 }
 $row['__custom'] = $custom_html;
 } else if (isset($column['option'])) {
 if (array_key_exists('default', $column['option'])) {
 if (strlen(($row[$col_key] . '')) == 0) {
 $row[$col_key] = $column['option']['default'];
 continue;
 }
 }
 if (array_key_exists('enum', $column['option'])) {
 $row[$col_key] = self::parse_enum($column['option']['enum'], $row[$col_key]);
 }
 if (array_key_exists('format', $column['option'])) {
 $row[$col_key] = self::parse_vars($column['option']['format'], $row);
 }
 }
 }
 $this->rows[] = $row;
 }
 return $this->rows;
 }
}