<?php

namespace App\Services;

use App\Models\Backflow;
use Carbon\Carbon;
use Exception;

class BackflowService extends BaseService
{
    public static string $MODEL = Backflow::class;


    public static function findOne(array $search): ?Backflow
    {
        return self::$MODEL::where(static::getWhere($search))->first();
    }


    /**
     * 进行回水操作
     * @param $id
     * @return bool
     * @throws Exception
     */
    public static function grant($id): bool
    {
        return RewardGrantService::grant('backflow', (int) $id, (string) (request()->user->username ?? 'system'));
    }


    /**
     * 只记录当月充值/提现，回水金额由 rewards:sync-bases 按分类亏损和规则计算。
     * @param $memberId string 会员ID
     * @param  $changeAmount float 充值或提现金额
     * @return Backflow
     */
    public static function updateOrCreate(string $memberId, float $changeAmount): Backflow
    {
        $date = Carbon::now('Asia/Shanghai')->format('Y-m');
        $field = $changeAmount > 0 ? 'recharge_amount' : 'withdrawal_amount';
        $backflow = static::$MODEL::firstOrCreate(['date' => $date, 'member_id' => $memberId]);
        if (in_array((int) $backflow->status, Backflow::OPEN_STATUSES, true)) $backflow->increment($field, $changeAmount);
        return $backflow->refresh();
    }


    /** 已发放 / 待发放 / 是否可发放（回水可在当月多次发放差额） */
    public static function grantFields(array $row): array
    {
        $amount = bcadd((string) ($row['amount'] ?? 0), '0', 2);
        $granted = bcadd((string) ($row['granted_amount'] ?? 0), '0', 2);
        $open = in_array((int) ($row['status'] ?? 0), Backflow::OPEN_STATUSES, true);
        $pending = $open && bccomp($amount, $granted, 2) > 0 ? bcsub($amount, $granted, 2) : '0.00';
        $month = Carbon::now('Asia/Shanghai')->format('Y-m');
        return [
            'amount' => $amount,
            'granted_amount' => $granted,
            'pending_amount' => $pending,
            // 当月需有差额才能发；往月未结清的记录即使差额为 0 也可点发放以结清
            'can_grant' => $open && (bccomp($pending, '0', 2) > 0 || (string) ($row['date'] ?? '') < $month),
            'status_text' => [Backflow::STATUS_PENDING => '未发放', Backflow::STATUS_GRANTED => '已发放', Backflow::STATUS_PARTIAL => '部分发放'][(int) ($row['status'] ?? 0)] ?? '',
        ];
    }

    public static function getWhere(array $search = []): array
    {
        $where = [];
        if (isset($search['id']) && !empty($search['id'])) {
            $where[] = ['backflow.id', '=', $search['id']];
        }

        if (isset($search['member_id']) && !empty($search['member_id'])) {
            $where[] = ['backflow.member_id', '=', $search['member_id']];
        }

        if (isset($search['date']) && !empty($search['date'])) {
            $where[] = ['backflow.date', '=', $search['date']];
        }


        if (isset($search['status']) && $search['status'] != '') {
            $where[] = ['backflow.status', '=', $search['status']];
        }
        
        if (!empty($search['account'])) {
            $where[] = ['users.account', 'like', '%' . trim((string)$search['account']) . '%'];
        }
        if (!empty($search['first_name'])) {
            $where[] = ['users.first_name','like', '%'.$search['first_name'].'%'];
        }

        return $where;
    }

    public static function paginate(array $search = []): array
    {

        // 当月（上海时间）的记录也展示实时统计；后台可手动提前发放，自动发放仍等到下个月，见 RewardGrantService::grant
        $month = Carbon::now('Asia/Shanghai')->format('Y-m');
        $query = static::$MODEL::join('users', 'users.member_id', '=', 'backflow.member_id')
                ->where(static::getWhere($search))
                ->where('backflow.date', '<=', $month);

        $paginator = $query->select("backflow.*", "users.first_name", "users.account", "users.admin_note as user_admin_note")->orderByDesc('date')->orderBy('status')
            ->paginate($search['limit']);
        foreach ($paginator->items() as $item) {
            foreach (self::grantFields($item->toArray()) as $field => $value) $item[$field] = $value;
        }

//        $count = $query->count();
//        $query->with(['user'])->orderByDesc('date')->orderBy('status');
//        $list = $query->forPage($search['page'], $search['limit'])->get()->toArray();
//        return ['total' => $count, 'data' => $list];
        return ['total' => $paginator->total(), 'data' => $paginator->items()];
    }
}