<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace yii\web;

use yii\base\Object;
use yii\helpers\Html;

/**
 * UploadedFile represents the information for an uploaded file.
 *
 * You can call [[getInstance()]] to retrieve the instance of an uploaded file,
 * and then use [[saveAs()]] to save it on the server.
 * You may also query other information about the file, including [[name]],
 * [[tempName]], [[type]], [[size]] and [[error]].
 *
 * @property boolean $hasError Whether there is an error with the uploaded file. Check [[error]] for detailed
 * error code information. This property is read-only.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @since 2.0
 */
class UploadedFile extends Object
{
	private static $_files;

	/**
	 * @var string the original name of the file being uploaded
	 */
	public $name;
	/**
	 * @var string the path of the uploaded file on the server.
	 * Note, this is a temporary file which will be automatically deleted by PHP
	 * after the current request is processed.
	 */
	public $tempName;
	/**
	 * @var string the MIME-type of the uploaded file (such as "image/gif").
	 * Since this MIME type is not checked on the server side, do not take this value for granted.
	 * Instead, use [[FileHelper::getMimeType()]] to determine the exact MIME type.
	 */
	public $type;
	/**
	 * @var integer the actual size of the uploaded file in bytes
	 */
	public $size;
	/**
	 * @var integer an error code describing the status of this file uploading.
	 * @see http://www.php.net/manual/en/features.file-upload.errors.php
	 */
	public $error;


	/**
	 * String output.
	 * This is PHP magic method that returns string representation of an object.
	 * The implementation here returns the uploaded file's name.
	 * @return string the string representation of the object
	 */
	public function __toString()
	{
		return $this->name;
	}

	/**
	 * Returns an uploaded file for the given model attribute.
	 * The file should be uploaded using [[ActiveForm::fileInput()]].
	 * @param \yii\base\Model $model the data model
	 * @param string $attribute the attribute name. The attribute name may contain array indexes.
	 * For example, '[1]file' for tabular file uploading; and 'file[1]' for an element in a file array.
	 * @return UploadedFile the instance of the uploaded file.
	 * Null is returned if no file is uploaded for the specified model attribute.
	 * @see getInstanceByName()
	 */
	public static function getInstance($model, $attribute)
	{
		$name = Html::getInputName($model, $attribute);
		return static::getInstanceByName($name);
	}

	/**
	 * Returns all uploaded files for the given model attribute.
	 * @param \yii\base\Model $model the data model
	 * @param string $attribute the attribute name. The attribute name may contain array indexes
	 * for tabular file uploading, e.g. '[1]file'.
	 * @return UploadedFile[] array of UploadedFile objects.
	 * Empty array is returned if no available file was found for the given attribute.
	 */
	public static function getInstances($model, $attribute)
	{
		$name = Html::getInputName($model, $attribute);
		return static::getInstancesByName($name);
	}

	/**
	 * Returns an uploaded file according to the given file input name.
	 * The name can be a plain string or a string like an array element (e.g. 'Post[imageFile]', or 'Post[0][imageFile]').
	 * @param string $name the name of the file input field.
	 * @return UploadedFile the instance of the uploaded file.
	 * Null is returned if no file is uploaded for the specified name.
	 */
	public static function getInstanceByName($name)
	{
		$files = static::loadFiles();
		return isset($files[$name]) ? $files[$name] : null;
	}

	/**
	 * Returns an array of uploaded files corresponding to the specified file input name.
	 * This is mainly used when multiple files were uploaded and saved as 'files[0]', 'files[1]',
	 * 'files[n]'..., and you can retrieve them all by passing 'files' as the name.
	 * @param string $name the name of the array of files
	 * @return UploadedFile[] the array of CUploadedFile objects. Empty array is returned
	 * if no adequate upload was found. Please note that this array will contain
	 * all files from all sub-arrays regardless how deeply nested they are.
	 */
	public static function getInstancesByName($name)
	{
		$files = static::loadFiles();
		if (isset($files[$name])) {
			return [$files[$name]];
		}
		$results = [];
		foreach ($files as $key => $file) {
			if (strpos($key, "{$name}[") === 0) {
				$results[] = self::$_files[$key];
			}
		}
		return $results;
	}

	/**
	 * Cleans up the loaded UploadedFile instances.
	 * This method is mainly used by test scripts to set up a fixture.
	 */
	public static function reset()
	{
		self::$_files = null;
	}

	/**
	 * Saves the uploaded file.
	 * Note that this method uses php's move_uploaded_file() method. If the target file `$file`
	 * already exists, it will be overwritten.
	 * @param string $file the file path used to save the uploaded file
	 * @param boolean $deleteTempFile whether to delete the temporary file after saving.
	 * If true, you will not be able to save the uploaded file again in the current request.
	 * @return boolean true whether the file is saved successfully
	 * @see error
	 */
	public function saveAs($file, $deleteTempFile = true)
	{
		if ($this->error == UPLOAD_ERR_OK) {
			if ($deleteTempFile) {
				return move_uploaded_file($this->tempName, $file);
			} elseif (is_uploaded_file($this->tempName)) {
				return copy($this->tempName, $file);
			}
		}
		return false;
	}

	/**
	 * @return boolean whether there is an error with the uploaded file.
	 * Check [[error]] for detailed error code information.
	 */
	public function getHasError()
	{
		return $this->error != UPLOAD_ERR_OK;
	}

	/**
	 * Creates UploadedFile instances from $_FILE.
	 * @return array the UploadedFile instances
	 */
	private static function loadFiles()
	{
		if (self::$_files === null) {
			self::$_files = [];
			if (isset($_FILES) && is_array($_FILES)) {
				foreach ($_FILES as $class => $info) {
					self::loadFilesRecursive($class, $info['name'], $info['tmp_name'], $info['type'], $info['size'], $info['error']);
				}
			}
		}
		return self::$_files;
	}

	/**
	 * Creates UploadedFile instances from $_FILE recursively.
	 * @param string $key key for identifying uploaded file: class name and sub-array indexes
	 * @param mixed $names file names provided by PHP
	 * @param mixed $tempNames temporary file names provided by PHP
	 * @param mixed $types file types provided by PHP
	 * @param mixed $sizes file sizes provided by PHP
	 * @param mixed $errors uploading issues provided by PHP
	 */
	private static function loadFilesRecursive($key, $names, $tempNames, $types, $sizes, $errors)
	{
		if (is_array($names)) {
			foreach ($names as $i => $name) {
				self::loadFilesRecursive($key . '[' . $i . ']', $name, $tempNames[$i], $types[$i], $sizes[$i], $errors[$i]);
			}
		} else {
			self::$_files[$key] = new static([
				'name' => $names,
				'tempName' => $tempNames,
				'type' => $types,
				'size' => $sizes,
				'error' => $errors,
			]);
		}
	}
}