<?php

namespace app\common\library;

/**
 * 订单状态机
 * 统一维护状态常量、文案与合法流转关系，前后端与后台共用同一套口径
 */
class OrderStatus
{
    const PENDING_PAY    = 0;   // 待支付
    const PENDING_ACCEPT = 1;   // 待接单（进入订单大厅）
    const QUOTING        = 2;   // 报价中（竞价单）
    const ACCEPTED       = 3;   // 已接单
    const SCHEDULED      = 4;   // 待上门（已约时间）
    const ARRIVED        = 5;   // 已到达（师傅定位打卡）
    const WORKING        = 6;   // 服务中（已开工）
    const PENDING_VERIFY = 7;   // 待验收（师傅完工）
    const COMPLETED      = 8;   // 已完成（用户验收/自动验收）
    const CANCELLED      = 9;   // 已取消
    const AFTERSALE      = 10;  // 售后中

    /** 状态文案 */
    protected static $labels = [
        self::PENDING_PAY    => '待支付',
        self::PENDING_ACCEPT => '待接单',
        self::QUOTING        => '报价中',
        self::ACCEPTED       => '已接单',
        self::SCHEDULED      => '待上门',
        self::ARRIVED        => '已到达',
        self::WORKING        => '服务中',
        self::PENDING_VERIFY => '待验收',
        self::COMPLETED      => '已完成',
        self::CANCELLED      => '已取消',
        self::AFTERSALE      => '售后中',
    ];

    /** 合法流转：from => [to, to, ...] */
    protected static $transitions = [
        self::PENDING_PAY    => [self::PENDING_ACCEPT, self::QUOTING, self::CANCELLED],
        self::PENDING_ACCEPT => [self::QUOTING, self::ACCEPTED, self::CANCELLED],
        self::QUOTING        => [self::ACCEPTED, self::CANCELLED],
        self::ACCEPTED       => [self::SCHEDULED, self::ARRIVED, self::PENDING_ACCEPT, self::CANCELLED],
        self::SCHEDULED      => [self::ARRIVED, self::PENDING_ACCEPT, self::CANCELLED],
        self::ARRIVED        => [self::WORKING],
        self::WORKING        => [self::PENDING_VERIFY],
        self::PENDING_VERIFY => [self::COMPLETED, self::WORKING, self::AFTERSALE],
        self::COMPLETED      => [self::AFTERSALE],
        self::AFTERSALE      => [self::COMPLETED, self::CANCELLED],
    ];

    /** 进行中（用户端"我的订单-进行中"、师傅端"待处理"） */
    protected static $activeStatus = [1, 2, 3, 4, 5, 6, 7];

    /** 状态提示文案（前后端统一由后端下发，避免两套口径） */
    protected static $tips = [
        self::PENDING_PAY    => '请尽快完成支付',
        self::PENDING_ACCEPT => '已进入接单大厅，等待师傅接单',
        self::QUOTING        => '师傅报价中，请稍候',
        self::ACCEPTED       => '师傅已接单，将尽快与您联系',
        self::SCHEDULED      => '已约定上门时间',
        self::ARRIVED        => '师傅已到达现场',
        self::WORKING        => '服务进行中',
        self::PENDING_VERIFY => '师傅已完工，请确认验收',
        self::COMPLETED      => '订单已完成，感谢您的信任',
        self::CANCELLED      => '订单已取消',
        self::AFTERSALE      => '售后处理中',
    ];

    /**
     * 状态提示文案
     */
    public static function tip($status)
    {
        $status = (int)$status;
        return isset(self::$tips[$status]) ? self::$tips[$status] : '';
    }

    /**
     * 取状态文案
     */
    public static function label($status)
    {
        $status = (int)$status;
        return isset(self::$labels[$status]) ? self::$labels[$status] : '未知状态';
    }

    /**
     * 全部状态（供前端渲染筛选 Tab）
     */
    public static function all()
    {
        $ret = [];
        foreach (self::$labels as $k => $v) {
            $ret[] = ['value' => $k, 'label' => $v];
        }
        return $ret;
    }

    /**
     * 判断是否允许从 $from 流转到 $to
     */
    public static function can($from, $to)
    {
        $from = (int)$from;
        $to = (int)$to;
        if (!isset(self::$transitions[$from])) {
            return false;
        }
        return in_array($to, self::$transitions[$from], true);
    }

    /**
     * 某状态可流转到的下一批状态
     */
    public static function next($from)
    {
        $from = (int)$from;
        return isset(self::$transitions[$from]) ? self::$transitions[$from] : [];
    }

    /**
     * 是否进行中
     */
    public static function isActive($status)
    {
        return in_array((int)$status, self::$activeStatus, true);
    }

    /**
     * 进行中的状态集合（用于 SQL in 查询）
     */
    public static function activeValues()
    {
        return self::$activeStatus;
    }

    /**
     * 用户是否可以取消
     */
    public static function canCancelByUser($status)
    {
        return in_array((int)$status, [self::PENDING_PAY, self::PENDING_ACCEPT, self::QUOTING, self::ACCEPTED, self::SCHEDULED], true);
    }
}