<?php

namespace app\common\library;

/** Numeric warning rules shared by the editor and persistence layer. */
class QualityRule
{
    public static function isNumber($value)
    {
        return (is_int($value) || is_float($value) || is_string($value))
            && is_numeric($value) && is_finite((float)$value);
    }

    public static function direction($item)
    {
        if (isset($item['direction']) && in_array($item['direction'], ['upper', 'lower'], true)) {
            return $item['direction'];
        }
        $warning = isset($item['warning']) ? $item['warning'] : null;
        $alert = isset($item['alert']) ? $item['alert'] : null;
        return self::isNumber($warning) && self::isNumber($alert) && $warning > $alert ? 'lower' : 'upper';
    }

    public static function validate($content, $originalRules = [])
    {
        if (!is_array($content) || empty($content)) {
            return '请填写检测参数';
        }
        $numericRules = [];
        foreach ($originalRules as $original) {
            if (isset($original['warning'], $original['alert'])
                && self::isNumber($original['warning']) && self::isNumber($original['alert'])) {
                $key = !empty($original['id']) ? 'id:' . $original['id'] : 'num:' . $original['num'];
                $numericRules[$key] = true;
            }
        }
        foreach ($content as $item) {
            if (!is_array($item)) {
                return '检测参数格式无效';
            }
            if (isset($item['direction']) && !in_array($item['direction'], ['upper', 'lower'], true)) {
                return '预警方向无效';
            }
            if (!isset($item['warning'], $item['alert'])) {
                return '请填写预警值和警告值';
            }
            $warningNumeric = self::isNumber($item['warning']);
            $alertNumeric = self::isNumber($item['alert']);
            $numeric = $warningNumeric && $alertNumeric;
            $key = !empty($item['id']) ? 'id:' . $item['id'] : 'num:' . (isset($item['num']) ? $item['num'] : '');
            $expectsNumeric = isset($numericRules[$key]) || (isset($item['is_number']) && (string)$item['is_number'] === '1')
                || $warningNumeric || $alertNumeric;
            if ($expectsNumeric && !$numeric) {
                return $item['name'] . '：预警值和警告值必须都是有限数字';
            }
            if (!isset($item['val']) || (is_string($item['val']) && trim($item['val']) === '')) {
                return $item['name'] . '：请填写检测值，缺测可填 /';
            }
            if ($numeric && !self::isNumber($item['val'])
                && !preg_match('/^(?:\/|--?|未检测|未提供|暂无|未检出|未检出\s*ND|ND)$/ui', trim((string)$item['val']))) {
                return $item['name'] . '：检测值必须是有限数字，缺测可填 /';
            }
            if ($numeric) {
                $upper = self::direction($item) === 'upper';
                if (($upper && $item['warning'] > $item['alert'])
                    || (!$upper && $item['warning'] < $item['alert'])) {
                    return $item['name'] . ($upper
                        ? '：越小越好指标要求预警值 ≤ 警告值（高值预警）'
                        : '：越大越好指标要求预警值 ≥ 警告值（低值预警）');
                }
            }
        }
        return '';
    }
}