<?php

namespace App\Module\OpenAPI\Validators;

use UCore\Validator;

/**
 * 频率限制配置验证器
 */
class RateLimitConfigValidator extends Validator
{
    /**
     * 验证频率限制配置是否有效
     *
     * @param mixed $value 频率限制配置数组
     * @param array $data 验证数据
     * @return bool 验证是否通过
     */
    public function validate(mixed $value, array $data): bool
    {
        // 从 args 获取参数
        $processedKey = $this->args[0] ?? 'processedRateLimits';

        if (empty($value)) {
            // 使用默认配置
            $value = $this->getDefaultRateLimits();
        }

        if (!is_array($value)) {
            $this->addError('频率限制配置必须是数组格式');
            return false;
        }

        $processedLimits = [];
        $validTypes = $this->getValidLimitTypes();

        foreach ($value as $type => $limit) {
            // 验证限制类型
            if (!in_array($type, $validTypes)) {
                $this->addError("无效的限制类型: {$type}");
                return false;
            }

            // 验证限制值
            if (!$this->validateLimitValue($type, $limit)) {
                return false;
            }

            $processedLimits[$type] = (int)$limit;
        }

        // 验证限制值的合理性
        if (!$this->validateLimitReasonableness($processedLimits)) {
            return false;
        }

        // 将处理后的配置保存到验证对象中
        $this->validation->$processedKey = $processedLimits;

        return true;
    }

    /**
     * 获取有效的限制类型
     *
     * @return array
     */
    protected function getValidLimitTypes(): array
    {
        return [
            'requests_per_minute',
            'requests_per_hour',
            'requests_per_day',
            'requests_per_week',
            'requests_per_month'
        ];
    }

    /**
     * 获取默认频率限制配置
     *
     * @return array
     */
    protected function getDefaultRateLimits(): array
    {
        return [
            'requests_per_minute' => 60,
            'requests_per_hour' => 1000,
            'requests_per_day' => 10000,
            'requests_per_week' => 50000,
            'requests_per_month' => 200000,
        ];
    }

    /**
     * 验证限制值
     *
     * @param string $type
     * @param mixed $limit
     * @return bool
     */
    protected function validateLimitValue(string $type, mixed $limit): bool
    {
        if (!is_numeric($limit)) {
            $this->addError("限制值必须是数字: {$type}");
            return false;
        }

        $limit = (int)$limit;

        if ($limit < 0) {
            $this->addError("限制值不能为负数: {$type}");
            return false;
        }

        // 验证最大限制值
        $maxLimits = [
            'requests_per_minute' => 10000,
            'requests_per_hour' => 100000,
            'requests_per_day' => 1000000,
            'requests_per_week' => 5000000,
            'requests_per_month' => 20000000,
        ];

        if (isset($maxLimits[$type]) && $limit > $maxLimits[$type]) {
            $this->addError("限制值过大: {$type} 最大值为 {$maxLimits[$type]}");
            return false;
        }

        return true;
    }

    /**
     * 验证限制值的合理性
     *
     * @param array $limits
     * @return bool
     */
    protected function validateLimitReasonableness(array $limits): bool
    {
        // 验证时间单位之间的合理性
        $timeUnits = [
            'requests_per_minute' => 1,
            'requests_per_hour' => 60,
            'requests_per_day' => 1440,
            'requests_per_week' => 10080,
            'requests_per_month' => 43200, // 30天
        ];

        foreach ($limits as $type => $limit) {
            if (!isset($timeUnits[$type])) {
                continue;
            }

            $perMinute = $limit / $timeUnits[$type];

            // 检查是否有更短时间单位的限制
            foreach ($timeUnits as $shorterType => $shorterMultiplier) {
                if ($shorterMultiplier >= $timeUnits[$type]) {
                    continue;
                }

                if (isset($limits[$shorterType])) {
                    $shorterPerMinute = $limits[$shorterType] / $shorterMultiplier;
                    
                    if ($perMinute > $shorterPerMinute) {
                        $this->addError("限制配置不合理: {$type} 的平均速率不能超过 {$shorterType}");
                        return false;
                    }
                }
            }
        }

        return true;
    }
}