<?php

declare(strict_types=1);

namespace plugin\saiadmin\app\service\promotion;

use plugin\saiadmin\app\model\water\WaterPromotionSetting;
use plugin\saiadmin\app\model\water\WaterSku;
use plugin\saiadmin\app\model\water\WaterModel;
use plugin\saiadmin\app\model\water\WaterLedger;
use plugin\saiadmin\app\service\WaterBusiness;
use plugin\saiadmin\exception\ApiException;

final class PromotionPolicy
{
    public const RULES = '企业管理员在首购前绑定邀请码；每家企业仅绑定一次。首笔非测试购水达到绑定时约定金额，购水后完成对应规格配送签收，经后台核实收款及退款情况后，向邀请企业发放约定水权益。奖励不可提现，不增加实物库存；与代理佣金分别记账。';

    public static function current(): array
    {
        $schema = (new WaterPromotionSetting())->getConnection()->getSchemaBuilder();
        $row = $schema->hasTable('sa_water_promotion_setting')
            ? WaterPromotionSetting::query()->with('sku')->find(1) : null;

        return [
            'initialized' => $row !== null,
            'enabled' => (bool) ($row?->enabled ?? false),
            'sku_id' => $row?->sku_id === null ? null : (int) $row->sku_id,
            'sku_name' => $row?->sku?->name,
            'quantity' => (int) ($row?->quantity ?? 0),
            'min_amount_cents' => (int) ($row?->min_amount_cents ?? 0),
            'revision' => (int) ($row?->revision ?? 0),
            'rules' => self::RULES,
        ];
    }

    public static function save(array $input, int $actor): array
    {
        if (!is_bool($input['enabled'] ?? null)) {
            throw new ApiException('活动开关必须为布尔值');
        }
        $revision = WaterBusiness::positive($input['revision'] ?? null, '规则版本');
        $quantity = WaterBusiness::positive($input['quantity'] ?? null, '奖励桶数', true);
        $minimum = WaterBusiness::positive($input['min_amount_cents'] ?? null, '首购门槛', true);
        $sku = WaterBusiness::positive($input['sku_id'] ?? 0, '赠水规格', true);
        if ($quantity > 10000 || $minimum > 100000000) {
            throw new ApiException('奖励最多10000桶，首购门槛最多1000000元');
        }
        if ($input['enabled'] && (!$quantity || !$sku)) {
            throw new ApiException('启用前请选择赠水规格并配置奖励桶数');
        }
        if ($sku && !WaterSku::query()->where('id', $sku)->where('status', 1)->exists()) {
            throw new ApiException('赠水规格不存在或已停用');
        }

        return WaterModel::transaction(function () use ($input, $actor, $revision, $quantity, $minimum, $sku) {
            $row = WaterPromotionSetting::query()->lockForUpdate()->find(1);
            if (!$row || (int) $row->revision !== $revision) {
                throw new ApiException('规则未初始化或已更新，请刷新后再试');
            }
            $row->fill([
                'enabled' => $input['enabled'], 'sku_id' => $sku ?: null,
                'quantity' => $quantity, 'min_amount_cents' => $minimum,
                'revision' => $revision + 1, 'updated_by' => $actor,
                'updated_at' => date('Y-m-d H:i:s'),
            ])->save();
            WaterLedger::query()->create([
                'kind' => 'promotion_policy', 'created_by' => $actor, 'sku_id' => $sku,
                'enterprise_id' => 0, 'quantity' => 0, 'reference' => 'promotion:policy:' . ($revision + 1),
                'note' => json_encode($row->toArray(), JSON_UNESCAPED_UNICODE | JSON_THROW_ON_ERROR),
                'created_at' => date('Y-m-d H:i:s'),
            ]);

            return self::current();
        });
    }
}