<?php
declare(strict_types=1);

namespace App\Dto;

/**
 * DTO基类
 * 所有数据传输对象都应该继承此类
 */
abstract class BaseDto
{
    /**
     * 数组转DTO
     */
    public static function fromArray(array $data): static
    {
        $dto = new static();
        
        foreach ($data as $key => $value) {
            $method = 'set' . str_replace('_', '', ucwords($key, '_'));
            
            if (method_exists($dto, $method)) {
                $dto->$method($value);
            } elseif (property_exists($dto, $key)) {
                $dto->$key = $value;
            }
        }
        
        return $dto;
    }

    /**
     * DTO转数组
     */
    public function toArray(): array
    {
        $data = [];
        $reflection = new \ReflectionClass($this);
        
        foreach ($reflection->getProperties() as $property) {
            $propertyName = $property->getName();
            $method = 'get' . str_replace('_', '', ucwords($propertyName, '_'));
            
            if (method_exists($this, $method)) {
                $data[$propertyName] = $this->$method();
            } else {
                $data[$propertyName] = $this->$propertyName ?? null;
            }
        }
        
        return $data;
    }

    /**
     * DTO转JSON
     */
    public function toJson(): string
    {
        return json_encode($this->toArray(), JSON_UNESCAPED_UNICODE);
    }

    /**
     * JSON转DTO
     */
    public static function fromJson(string $json): static
    {
        $data = json_decode($json, true);
        
        if (!is_array($data)) {
            throw new \InvalidArgumentException('Invalid JSON data');
        }
        
        return static::fromArray($data);
    }

    /**
     * 验证DTO数据
     */
    public function validate(): array
    {
        $errors = [];
        $reflection = new \ReflectionClass($this);
        
        foreach ($reflection->getProperties() as $property) {
            $propertyName = $property->getName();
            $value = $this->$propertyName ?? null;
            
            // 检查必填字段
            $attributes = $property->getAttributes('Required');
            if (!empty($attributes) && ($value === null || $value === '')) {
                $errors[$propertyName] = "Field {$propertyName} is required";
                continue;
            }
            
            // 检查数据类型
            $type = $property->getType();
            if ($type && $value !== null) {
                $typeName = $type->getName();
                
                if (!$this->validateType($value, $typeName)) {
                    $errors[$propertyName] = "Field {$propertyName} must be of type {$typeName}";
                }
            }
        }
        
        return $errors;
    }

    /**
     * 验证数据类型
     */
    private function validateType(mixed $value, string $type): bool
    {
        return match ($type) {
            'int', 'integer' => is_int($value),
            'float', 'double' => is_float($value),
            'string' => is_string($value),
            'bool', 'boolean' => is_bool($value),
            'array' => is_array($value),
            'object' => is_object($value),
            default => true,
        };
    }

    /**
     * 获取所有属性
     */
    public function getProperties(): array
    {
        $reflection = new \ReflectionClass($this);
        $properties = [];
        
        foreach ($reflection->getProperties() as $property) {
            $properties[$property->getName()] = $this->{$property->getName()} ?? null;
        }
        
        return $properties;
    }

    /**
     * 设置属性
     */
    public function setProperty(string $name, mixed $value): void
    {
        $method = 'set' . str_replace('_', '', ucwords($name, '_'));
        
        if (method_exists($this, $method)) {
            $this->$method($value);
        } elseif (property_exists($this, $name)) {
            $this->$name = $value;
        }
    }

    /**
     * 获取属性
     */
    public function getProperty(string $name): mixed
    {
        $method = 'get' . str_replace('_', '', ucwords($name, '_'));
        
        if (method_exists($this, $method)) {
            return $this->$method();
        }
        
        return $this->$name ?? null;
    }

    /**
     * 检查属性是否存在
     */
    public function hasProperty(string $name): bool
    {
        return property_exists($this, $name) || method_exists($this, 'get' . str_replace('_', '', ucwords($name, '_')));
    }

    /**
     * 克隆DTO
     */
    public function clone(): static
    {
        return clone $this;
    }

    /**
     * 合并另一个DTO
     */
    public function merge(BaseDto $other): static
    {
        $newDto = $this->clone();
        $otherData = $other->toArray();
        
        foreach ($otherData as $key => $value) {
            if ($value !== null) {
                $newDto->setProperty($key, $value);
            }
        }
        
        return $newDto;
    }

    /**
     * 魔术方法：转换为字符串
     */
    public function __toString(): string
    {
        return $this->toJson();
    }

    /**
     * 魔术方法：调试输出
     */
    public function __debugInfo(): array
    {
        return $this->toArray();
    }
}

/**
 * 必填字段注解
 */
#[\Attribute(\Attribute::TARGET_PROPERTY)]
class Required
{
    public function __construct(public string $message = '') {}
}

/**
 * 字段长度注解
 */
#[\Attribute(\Attribute::TARGET_PROPERTY)]
class Length
{
    public function __construct(public int $min = 0, public int $max = 255) {}
}

/**
 * 字段范围注解
 */
#[\Attribute(\Attribute::TARGET_PROPERTY)]
class Range
{
    public function __construct(public mixed $min = null, public mixed $max = null) {}
}

/**
 * 正则表达式注解
 */
#[\Attribute(\Attribute::TARGET_PROPERTY)]
class Pattern
{
    public function __construct(public string $regex) {}
}