<?php

declare(strict_types=1);

namespace plugin\saiadmin\app\service\agent;

use DomainException;
use plugin\saiadmin\app\model\water\WaterAgent;
use plugin\saiadmin\app\model\water\WaterCommission;
use plugin\saiadmin\app\model\water\WaterEnterprise;
use plugin\saiadmin\app\model\water\WaterOrder;

/** Record the direct agent's commission inside the paid-order transaction. */
final class WaterCommissionAccrual
{
    public function record(WaterOrder $order, WaterEnterprise $enterprise): void
    {
        // Historical demo orders are not real receipts and must not create payable commissions.
        if (str_starts_with($order->reference, 'TEST-') || str_contains($order->package_name, '测试')) {
            return;
        }

        $agent = $enterprise->agent;
        if (!$agent || (int) $agent->status !== 1) {
            return;
        }

        $level = $this->level($agent);
        if ($level === null) {
            return;
        }

        $baseAmount = (int) $order->amount_cents;
        $rate = WaterCommissionPolicy::rate($level, true);
        WaterCommission::query()->create([
            'order_id' => (int) $order->id,
            'enterprise_id' => (int) $enterprise->id,
            'enterprise_name' => $enterprise->name,
            'agent_id' => (int) $agent->id,
            'agent_level' => $level,
            'rate_basis_points' => $rate,
            'base_amount_cents' => $baseAmount,
            'amount_cents' => WaterCommissionPolicy::amountAtRate($baseAmount, $rate),
            'status' => 'pending',
            'created_at' => $order->created_at,
        ]);
    }

    private function level(WaterAgent $agent): ?int
    {
        $level = 1;
        $seen = [];
        while (true) {
            $id = (int) $agent->id;
            if (isset($seen[$id]) || $level > 3) {
                throw new DomainException('代理上下级关系异常，无法计提佣金');
            }
            $seen[$id] = true;
            if ($agent->parent_id === null) {
                return null;
            }
            if ((int) $agent->parent_id === 0) {
                return $level;
            }
            $agent = WaterAgent::query()->find((int) $agent->parent_id)
                ?? throw new DomainException('代理上级不存在，无法计提佣金');
            $level++;
        }
    }
}