<?php
/**
 * Created by PhpStorm.
 * User: NullFeng
 * Date: 2017/12/25
 * Time: 10:41
 */

namespace app\admin\traits;

use think\Config;
use think\Controller;
use think\Request;
use utils\ListModel;

/**
 * Trait ListViewBuilder
 * @package app\admin\traits
 * 通用列表视图
 */
trait ListViewBuilder
{
    /**
     * 列表数据模型
     */
    protected $list_model;

    /**
     * 分页信息
     */
    protected $page_info = [
        'no' => 0,      //当前页码
        'count' => 0,   //总页数
        'total' => 0,   //总记录数
        'size' => 10,  //单页显示记录数
    ];
    /**
     * 当前查询条件数组
     */
    protected $query_condition = [];
    /**
     * 搜索字段配置
     */
    protected $search_config = [];

    /**
     * 创建列表模型
     * @return ListModel
     */
    public function createListModel()
    {
        $this->list_model = new ListModel();
        return $this->list_model;
    }

    /**
     * 生成数据
     * @return array
     */
    public function fetchRows()
    {
        if (!$this->list_model)
            return [];
        return $this->list_model->fetchRows();
    }

    /**
     * 获取头部
     * @return array
     */
    public function fetchHeaders()
    {
        if (!$this->list_model)
            return [];
        return $this->list_model->getHeaders();
    }

    /**
     * 添加搜索字段（在获取数据之前调用）
     * @param $name   对应数据库里面的字段
     * @param $option array(
     *                      'title'=>'显示标题',
     *                      'type'=>'搜索类型：text|select|date',
     *                      'method'=>'搜索方式：equals|contain',
     *                      'placeholder'=>'类型为text时生效：string'
     *                      'list'=>'类型为select时生效：array'
     *                      )
     * @return $this
     */
    public function addSearchField($name, $option)
    {
        $this->search_config[$name] = $option;
        return $this;
    }

    /**
     * 接收表单提交（必须放置于添加搜索字段之后）
     */
    public function receivePost()
    {
        if ($this instanceof Controller && Request::instance()->isPost()) {
            $data = input('post.');
            $query_fields = isset($data['_query']) ? $data['_query'] : [];//取出要查询的字段
            if (!empty($query_fields)) {
                $config = $this->search_config;//读取所有字段的查询方式
                foreach ($query_fields as $key => $field) {//遍历要查询的字段
                    if (isset($config[$key])) {//如果要查询的字段在配置里面
                        if ($field === '_no_select_') {//如果值等于_no_select_则表示选择的是下拉框中的“全部”
                            $query_fields[$key] = 98765675;
                            continue;
                        }
                        if (strlen($field . '') == 0) {//要查询的值为空串
                            continue;
                        }
                        $config_filed = $config[$key];
                        switch ($config_filed['method']) {
                            case 'contain':
                                $this->query_condition[$key] = array('like', '%' . $field . '%');
                                break;

                            case 'equals':
                            default:
                                $this->query_condition[$key] = $field;
                                break;
                        }
                    }
                }
            }
            $this->assign('_query_fields', $query_fields);
        }
    }

    /**
     * 获取当前查询条件
     */
    public function getQueryCondition()
    {
        return $this->query_condition;
    }

    /**
     * 配置分页
     */
    public function configPage($total, $size = 1)
    {
        if (!empty($total)) {
            $this->page_info['count'] = ceil($total / ($size * 1.0));
            $this->page_info['no'] = 1;
            $data = input('post.');//从提交过来的参数获取当前页码
            if (isset($data['_page_no'])) {
                $this->page_info['no'] = $data['_page_no'];
            }
            $this->page_info['total'] = $total;
            $this->page_info['size'] = $size;
        }
    }

    /**
     * 获取当前页码
     * @return mixed
     */
    public function getCurrentPageNo()
    {
        return $this->page_info['no'];
    }

    /**
     * 获取单页显示数量
     * @return mixed
     */
    public function getPageSize()
    {
        return $this->page_info['size'];
    }

    /**
     * 渲染通用列表视图（页面需要手动选择list_view变量）
     * @param string $tpl
     * @return mixed|string
     */
    public function fetchListView($tpl = ':common_list')
    {
        if ($this instanceof Controller) {
            $this->assign('_headers', $this->fetchHeaders());
            $this->assign('_rows', $this->fetchRows());
            $this->assign('_search', $this->search_config);
            $this->assign('_page', $this->page_info);
            $this->view->engine->layout(false);
            $list_view = $this->fetch($tpl);
            $this->view->engine->layout(true);
            $this->assign('list_view', $list_view);
            return $this->fetch();
        }
        return '只能在控制器中使用！！！';
    }
}