<?php

namespace App\Actions;

use App\Models\Orders;
use Illuminate\Support\Facades\DB;

class AttachAffectedOrders
{

    /*
     * 获取关联影响的订单
     * 前置条件是订单状态为进行中
     * 忽略服务开始日期因素，基于后续的主订单修改只针对今天或明天生效，原因如下：
     * 1、如果服务日期开始于今天之前，那今明两天势必已经包含在被影响到的范围
     * 2、如果服务日期开始于明天，那前端可锁定、或现场管理人员可以自定判断，在后续的订单修改时，提交生效起始时间为明天
     * 3、如果服务日期开始于后天及以后，为极小概率事件，现场管理人员可在此刻忽略后续的订单处理，待服务日期开始后自行调整
     * todo:目前的策略为统一的，只区分一对一和一对多；如要按照更精确的按照1对N进行计算，需要更改此action
     */

    public function __invoke(Orders $order, $from_paramedic = null)
    {
        $affected_orders = [];
        //前置条件
        if ($order->status != Orders::STATUS_ONGOING) {
            $order->affected_orders = $affected_orders;
            return $order;
        }
        //护工没换
        if ($order->paramedic_id == $from_paramedic) {
            $order->affected_orders = $affected_orders;
            return $order;
        }

        //更换护工，查询从原护工手上退出订单后，原护工的其他订单是否变成了1对1
        if ($from_paramedic) {
            $last_orders = $this->getOrderModel()->where("paramedic_id", $from_paramedic)
                ->where("status", Orders::STATUS_ONGOING)
                ->where("paramedic_id", "<>", $order->paramedic_id) //剔除未更换护工的情况
                ->get();

            //仅取唯一的一条。如果总数大于1，说明护工撤出后仍然是一对多，按照既定规则，不产生价格变化
            if ($last_orders->count() === 1) {
                $many_to_one = $last_orders->first();
                $many_to_one->change = "many_to_one";
                $affected_orders[] = $many_to_one;
            }
        }

        //查询护工新接手一张单之后，是否有订单从1对1变成了1对多
        $new_same_paramedic_orders = $this->getOrderModel()->where("paramedic_id", $order->paramedic_id)
            ->where("status", Orders::STATUS_ONGOING)
            ->where("id", "<>", $order->id) //剔除订单本身
            ->get();

        //仅取唯一的一条。如果总数大于1，说明护工在未增加订单之前已经是1对多，按照既定规则，不产生价格变化
        if ($new_same_paramedic_orders->count() === 1) {
            $one_to_many = $new_same_paramedic_orders->first();
            $one_to_many->change = "one_to_many";
            $affected_orders[] = $one_to_many;
        }

        foreach ($affected_orders as $affected_order) {
            $affected_order->from_order_id = $order->id;
            $affected_order->from_paramedic_id = $from_paramedic;
        }

        $order->affected_orders = collect($affected_orders);
        return $order;
    }

    public function getOrderModel()
    {
        $model = Orders::with([
            "project" => function ($query) {
                $query->select("id", "name");
            },
            "bed" => function ($query) {
                $query->select("bed.id", "bed.name")
                    ->leftJoin("building", "building.id", "=", "bed.building_id")
                    ->leftJoin("area", "area.id", "=", "bed.area_id")
                    ->leftJoin("room", "room.id", "=", "bed.room_id")
                    ->addSelect("room.name as room_name", "area.name as area_name", "building.name as building_name");
            },
            "patient" => function ($query) {
                $query->select("id", "name", "sex", "age", "mobile");
            },
            "paramedic" => function ($query) {
                $query->select("paramedic.id", "paramedic.name", "paramedic.mobile")
                    ->leftJoin("paramedic_level", "paramedic_level.id", "=", "paramedic.paramedic_level_id")
                    ->addSelect("paramedic_level.name as paramedic_level_name");
            }
        ]);
        return $model;
    }
}