<?php

namespace App\Services\Dealer;

use App\Enums\DealerWalletAction;
use App\Exceptions\BizException;
use App\Models\DealerWallet;
use App\Models\DealerWalletLog;
use App\Models\User;
use Illuminate\Database\Eloquent\Model;

class WalletService
{
    /**
     * 变更钱包余额
     *
     * @param \App\Models\User $user
     * @param float $changeBalance
     * @param \App\Enums\DealerWalletAction $action
     * @param string|null $remarks
     * @param \Illuminate\Database\Eloquent\Model|null $loggable
     * @return DealerWalletLog $log
     */
    public function changeBalance(User $user, $changeBalance, DealerWalletAction $action, ?string $remarks = null, ?Model $loggable = null)
    {
        if (bccomp($changeBalance, '0', 2) === 0) {
            return;
        }

        $wallet = $this->wallet($user);

        // 变更前余额
        $beforeBalance = $wallet->balance;

        if (bccomp($changeBalance, '0', 2) < 0) {
            // 支出

            $absChangeBalance = abs($changeBalance);

            if (bccomp($wallet->balance, $absChangeBalance, 2) === -1) {
                throw new BizException('余额不足');
            }

            $wallet->update([
                'balance' => bcsub($wallet->balance, $absChangeBalance, 2),
                'total_expenses' => bcadd($wallet->total_expenses, $absChangeBalance, 2),
            ]);
        } else {
            // 收入

            $wallet->update([
                'balance' => bcadd($wallet->balance, $changeBalance, 2),
                'total_revenue' => bcadd($wallet->total_revenue, $changeBalance, 2),
            ]);
        }

        return $user->dealerWalletLogs()->create([
            'loggable_id' => $loggable?->id,
            'loggable_type' => $loggable?->getMorphClass(),
            'before_balance' => $beforeBalance,
            'change_balance' => $changeBalance,
            'action' => $action,
            'remarks' => $remarks,
        ]);
    }

    /**
     * @param \App\Models\User $user
     * @return \App\Models\DealerWallet
     */
    protected function wallet(User $user): DealerWallet
    {
        if ($wallet = $user->dealerWallet()->lockForUpdate()->first()) {
            return $wallet;
        }

        $user->dealerWallet()->create();

        return $this->wallet($user);
    }
}