<?php
namespace App\Model;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Facades\Log;

class MedicalCalculator extends Model
{
    protected $table = 'medical_calculators';
    public $timestamps = false;

    protected $fillable = [
        'name', 'disease_name', 'formula', 'instructions', 'results'
    ];

    // 移除 results 的 cast，因为我们将手动处理它
    // protected $casts = [
    //     'results' => 'array',
    // ];

    public function questions()
    {
        return $this->hasMany(MedicalQuestion::class, 'medical_calculator_id');
    }

    public function calculateResult($inputs)
    {
        $formula = $this->formula;

        // 获取公式中的所有变量名
        preg_match_all('/\b([a-zA-Z_]\w*)\b/', $formula, $matches);
        $formulaVariables = array_unique($matches[1]);

        foreach ($formulaVariables as $variable) {
            if (!isset($inputs[$variable])) {
                throw new \Exception("Missing input for variable: {$variable}");
            }
            if (!is_numeric($inputs[$variable])) {
                throw new \Exception("Non-numeric input for variable: {$variable}");
            }
            // 使用正则表达式确保只替换完整的变量名
            $formula = preg_replace('/\b' . preg_quote($variable, '/') . '\b/', $inputs[$variable], $formula);
        }

        // 使用 eval() 可能存在安全风险，建议使用更安全的表达式解析库
        $result = eval('return ' . $formula . ';');

        return $result;
    }

    protected $casts = [
        'results' => 'array',
    ];

    public function setResultsAttribute($value)
    {
        
        if (is_array($value)) {
            $this->attributes['results'] = json_encode(array_values($value));
        } elseif (is_string($value)) {
            $decoded = json_decode($value, true);
            if (is_array($decoded)) {
                $this->attributes['results'] = json_encode(array_values($decoded));
            } else {
                $this->attributes['results'] = '[]';
            }
        } else {
            $this->attributes['results'] = '[]';
        }
        
    }

    public function getResultsAttribute($value)
    {
        
        if (is_string($value)) {
            $decoded = json_decode($value, true);
            $result = is_array($decoded) ? array_values($decoded) : [];
        } else {
            $result = is_array($value) ? array_values($value) : [];
        }
        
        return $result;
    }
}