<?php

namespace app\admin\controller\fc;

use app\common\controller\Backend;
use think\Db;

/**
 * 同城-服务区域（省 / 市 / 区县平铺，区县为最终服务区域）
 *
 * @icon fa fa-map-o
 */
class Area extends Backend
{

    /**
     * FcArea模型对象
     * @var \app\admin\model\FcArea
     */
    protected $model = null;

    public function _initialize()
    {
        parent::_initialize();
        $this->model = new \app\admin\model\FcArea;
    }

    /**
     * 新增：保存前校验
     */
    public function add()
    {
        $this->assignAreaOptions();
        if ($this->request->isPost()) {
            $this->validateArea($this->request->post('row/a'), 0);
        }
        return parent::add();
    }

    /**
     * 编辑：保存前校验
     * @param string $ids
     */
    public function edit($ids = null)
    {
        $this->assignAreaOptions();
        if ($this->request->isPost()) {
            $this->validateArea($this->request->post('row/a'), (int)$this->request->param('ids'));
        }
        return parent::edit($ids);
    }

    /**
     * 省 / 市 / 区县已添加记录，供表单级联下拉合并全国行政区划及已添加状态标记使用
     */
    protected function assignAreaOptions()
    {
        $rows = Db::name('fc_area')
            ->field('id,province,city,district,lat,lng')
            ->order('province asc, city asc, district asc')
            ->select();
        $this->view->assign('areaOptionsJson', json_encode($rows, JSON_UNESCAPED_UNICODE));
    }

    /**
     * 保存前校验：省 / 市 / 区县均必填，同一组合不可重复
     * @param array $params 表单数据
     * @param int $id 编辑时的区域ID
     */
    protected function validateArea($params, $id = 0)
    {
        $province = isset($params['province']) ? trim((string)$params['province']) : '';
        $city = isset($params['city']) ? trim((string)$params['city']) : '';
        $district = isset($params['district']) ? trim((string)$params['district']) : '';

        $values = ['省份' => $province, '城市' => $city, '区县' => $district];
        foreach ($values as $label => $value) {
            if ($value === '') {
                $this->error($label . '不能为空');
            }
            if (mb_strlen($value) > 32) {
                $this->error($label . '不能超过 32 个字符');
            }
        }

        $duplicate = Db::name('fc_area')
            ->where('province', $province)
            ->where('city', $city)
            ->where('district', $district)
            ->where('id', '<>', $id)
            ->find();
        if ($duplicate) {
            $this->error('该省市区组合已存在');
        }

        foreach (['lat' => 90, 'lng' => 180] as $field => $limit) {
            if (!isset($params[$field]) || $params[$field] === '' || $params[$field] === null) {
                continue;
            }
            if (!is_numeric($params[$field]) || (float)$params[$field] < -$limit || (float)$params[$field] > $limit) {
                $this->error($field === 'lat' ? '纬度格式不正确' : '经度格式不正确');
            }
        }
    }
}