<?php

namespace App\Services\Agent;

use App\Models\Agent\Agent;
use App\Models\Agent\AgentBalanceLog;
use App\Models\Agent\AgentWithdrawAccount;
use App\Models\Agent\AgentWithdrawal;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Hash;
use Illuminate\Support\Str;

class AgentWithdrawalService
{
    public function request(Agent $agent, int $accountId, string $amount, string $withdrawPassword, string $requestId, string $remark = ''): AgentWithdrawal
    {
        if (bccomp($amount, '0', 4) <= 0) {
            throw new \InvalidArgumentException('提现金额必须大于0');
        }
        if ($agent->withdraw_password === '' || !Hash::check($withdrawPassword, (string) $agent->withdraw_password)) {
            throw new \InvalidArgumentException('提现密码错误');
        }

        $requestKey = 'agent:' . $agent->id . ':' . $requestId;
        return DB::transaction(function () use ($agent, $accountId, $amount, $remark, $requestKey): AgentWithdrawal {
            $existing = AgentWithdrawal::query()->where('request_key', $requestKey)->first();
            if ($existing) {
                $this->assertSameRequest($existing, $accountId, $amount);
                return $existing;
            }
            $lockedAgent = Agent::query()->lockForUpdate()->findOrFail($agent->id);
            $existing = AgentWithdrawal::query()->where('request_key', $requestKey)->first();
            if ($existing) {
                $this->assertSameRequest($existing, $accountId, $amount);
                return $existing;
            }
            $account = AgentWithdrawAccount::query()
                ->where('agent_id', $lockedAgent->id)
                ->where('status', 1)
                ->findOrFail($accountId);
            if (bccomp((string) $lockedAgent->balance, $amount, 4) < 0) {
                throw new \RuntimeException('代理余额不足');
            }

            $fee = bcdiv(bcmul($amount, (string) $lockedAgent->withdraw_fee_rate, 8), '100', 4);
            $actual = bcsub($amount, $fee, 4);
            if (bccomp($actual, '0', 4) <= 0) {
                throw new \RuntimeException('扣除手续费后到账金额必须大于0');
            }

            $before = bcadd((string) $lockedAgent->balance, '0', 4);
            $lockedAgent->balance = bcsub($before, $amount, 4);
            $lockedAgent->frozen_balance = bcadd((string) $lockedAgent->frozen_balance, $amount, 4);
            $lockedAgent->save();

            $withdrawal = AgentWithdrawal::query()->create([
                'order_no' => 'AW' . now()->format('YmdHis') . strtoupper(Str::random(8)),
                'request_key' => $requestKey,
                'agent_id' => $lockedAgent->id,
                'account_id' => $account->id,
                'account_type' => $account->type,
                'account_snapshot' => [
                    'type' => $account->type,
                    'name' => $account->name,
                    'account' => $account->account,
                    'bank_name' => $account->bank_name,
                    'network' => $account->network,
                    'details' => $account->details,
                ],
                'amount' => $amount,
                'fee' => $fee,
                'actual_amount' => $actual,
                'status' => 'pending',
                'remark' => $remark,
            ]);

            AgentBalanceLog::query()->create([
                'agent_id' => $lockedAgent->id,
                'type' => 'withdraw_freeze',
                'amount' => bcsub('0', $amount, 4),
                'before_balance' => $before,
                'after_balance' => $lockedAgent->balance,
                'reference_type' => 'agent_withdrawal',
                'reference_id' => $withdrawal->id,
                'operator_type' => 'agent',
                'operator_id' => $lockedAgent->id,
                'idempotency_key' => 'withdraw-freeze:' . $withdrawal->id,
                'remark' => $remark,
            ]);

            return $withdrawal->fresh();
        });
    }

    public function audit(int $withdrawalId, string $action, int $adminId, string $remark = ''): AgentWithdrawal
    {
        if (!in_array($action, ['approve', 'reject', 'paid'], true)) {
            throw new \InvalidArgumentException('审核动作错误');
        }

        return DB::transaction(function () use ($withdrawalId, $action, $adminId, $remark): AgentWithdrawal {
            $withdrawal = AgentWithdrawal::query()->lockForUpdate()->findOrFail($withdrawalId);
            $agent = Agent::query()->lockForUpdate()->findOrFail($withdrawal->agent_id);

            if ($action === 'approve') {
                if ($withdrawal->status !== 'pending') {
                    throw new \RuntimeException('只有待审核订单可以通过');
                }
                $withdrawal->status = 'approved';
                $withdrawal->audited_at = now();
                $withdrawal->audit_admin_id = $adminId;
            } elseif ($action === 'reject') {
                if (!in_array($withdrawal->status, ['pending', 'approved'], true)) {
                    throw new \RuntimeException('当前订单不能驳回');
                }
                $before = bcadd((string) $agent->balance, '0', 4);
                if (bccomp((string) $agent->frozen_balance, (string) $withdrawal->amount, 4) < 0) {
                    throw new \RuntimeException('代理冻结余额异常');
                }
                $agent->balance = bcadd($before, (string) $withdrawal->amount, 4);
                $agent->frozen_balance = bcsub((string) $agent->frozen_balance, (string) $withdrawal->amount, 4);
                $agent->save();
                AgentBalanceLog::query()->firstOrCreate(
                    ['idempotency_key' => 'withdraw-refund:' . $withdrawal->id],
                    [
                        'agent_id' => $agent->id,
                        'type' => 'withdraw_refund',
                        'amount' => $withdrawal->amount,
                        'before_balance' => $before,
                        'after_balance' => $agent->balance,
                        'reference_type' => 'agent_withdrawal',
                        'reference_id' => $withdrawal->id,
                        'operator_type' => 'admin',
                        'operator_id' => $adminId,
                        'remark' => $remark,
                    ]
                );
                $withdrawal->status = 'rejected';
                $withdrawal->audited_at = now();
                $withdrawal->audit_admin_id = $adminId;
            } else {
                if ($withdrawal->status !== 'approved') {
                    throw new \RuntimeException('只有已通过订单可以标记已付款');
                }
                if (bccomp((string) $agent->frozen_balance, (string) $withdrawal->amount, 4) < 0) {
                    throw new \RuntimeException('代理冻结余额异常');
                }
                $agent->frozen_balance = bcsub((string) $agent->frozen_balance, (string) $withdrawal->amount, 4);
                $agent->save();
                $withdrawal->status = 'paid';
                $withdrawal->paid_at = now();
            }

            $withdrawal->audit_remark = $remark;
            $withdrawal->save();
            return $withdrawal->fresh();
        });
    }

    private function assertSameRequest(AgentWithdrawal $withdrawal, int $accountId, string $amount): void
    {
        if ((int) $withdrawal->account_id !== $accountId || bccomp((string) $withdrawal->amount, $amount, 4) !== 0) {
            throw new \RuntimeException('request_id 已用于其他提现申请');
        }
    }
}