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<?php
/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2018 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\WebAsset;

\defined('JPATH_PLATFORM') or die;

use Joomla\CMS\HTML\HTMLHelper;

/**
 * Web Asset Item class
 *
 * Asset Item are "read only" object, all properties must be set through class constructor.
 * Only properties allowed to be edited is an attributes and an options.
 * Changing an uri or a dependencies are not allowed, prefer to create a new asset instance.
 *
 * @since  4.0.0
 */
class WebAssetItem implements WebAssetItemInterface
{
	/**
	 * Asset name
	 *
	 * @var    string  $name
	 * @since  4.0.0
	 */
	protected $name = '';

/**
	 * The URI for the asset
	 *
	 * @var    string
	 * @since  4.0.0
	 */
	protected $uri = '';

/**
	 * Additional options for the asset
	 *
	 * @var    array
	 * @since  4.0.0
	 */
	protected $options = [];

/**
	 * Attributes for the asset, to be rendered in the asset's HTML tag
	 *
	 * @var    array
	 * @since  4.0.0
	 */
	protected $attributes = [];

/**
	 * Asset dependencies
	 *
	 * @var    string[]
	 * @since  4.0.0
	 */
	protected $dependencies = [];

/**
	 * Asset version
	 *
	 * @var    string
	 * @since  4.0.0
	 */
	protected $version = 'auto';

/**
	 * Class constructor
	 *
	 * @param   string  $name          The asset name
	 * @param   string  $uri           The URI for the asset
	 * @param   array   $options       Additional options for the asset
	 * @param   array   $attributes    Attributes for the asset
	 * @param   array   $dependencies  Asset dependencies
	 *
	 * @since   4.0.0
	 */
	public function __construct(
		string $name,
		string $uri = null,
		array $options = [],
		array $attributes = [],
		array $dependencies = []
	)
	{
		$this->name    = $name;
		$this->uri     = $uri;

if (array_key_exists('version', $options))
		{
			$this->version = $options['version'];
			unset($options['version']);
		}

if (array_key_exists('attributes', $options))
		{
			$this->attributes = (array) $options['attributes'];
			unset($options['attributes']);
		}
		else
		{
			$this->attributes = $attributes;
		}

if (array_key_exists('dependencies', $options))
		{
			$this->dependencies = (array) $options['dependencies'];
			unset($options['dependencies']);
		}
		else
		{
			$this->dependencies = $dependencies;
		}

$this->options = $options;
	}

/**
	 * Return Asset name
	 *
	 * @return  string
	 *
	 * @since   4.0.0
	 */
	public function getName(): string
	{
		return $this->name;
	}

/**
	 * Return Asset version
	 *
	 * @return  string
	 *
	 * @since   4.0.0
	 */
	public function getVersion(): string
	{
		return (string) $this->version;
	}

/**
	 * Return dependencies list
	 *
	 * @return  array
	 *
	 * @since   4.0.0
	 */
	public function getDependencies(): array
	{
		return $this->dependencies;
	}

/**
	 * Get the file path
	 *
	 * @param   boolean  $resolvePath  Whether need to search for a real paths
	 *
	 * @return  string  The resolved path if resolved, else an empty string.
	 *
	 * @since   4.0.0
	 */
	public function getUri($resolvePath = true): string
	{
		$path = $this->uri;

if ($resolvePath && $path)
		{
			switch (pathinfo($path, PATHINFO_EXTENSION))
			{
				case 'js':
					$path = $this->resolvePath($path, 'script');
					break;
				case 'css':
					$path = $this->resolvePath($path, 'stylesheet');
					break;
				default:
					break;
			}
		}

return $path ?? '';
	}

/**
	 * Get the option
	 *
	 * @param   string  $key      An option key
	 * @param   string  $default  A default value
	 *
	 * @return mixed
	 *
	 * @since   4.0.0
	 */
	public function getOption(string $key, $default = null)
	{
		if (array_key_exists($key, $this->options))
		{
			return $this->options[$key];
		}

return $default;
	}

/**
	 * Set the option
	 *
	 * @param   string  $key    An option key
	 * @param   string  $value  An option value
	 *
	 * @return self
	 *
	 * @since   4.0.0
	 */
	public function setOption(string $key, $value = null): WebAssetItemInterface
	{
		$this->options[$key] = $value;

return $this;
	}

/**
	 * Get all options
	 *
	 * @return array
	 *
	 * @since   4.0.0
	 */
	public function getOptions(): array
	{
		return $this->options;
	}

/**
	 * Get the attribute
	 *
	 * @param   string  $key      An attributes key
	 * @param   string  $default  A default value
	 *
	 * @return mixed
	 *
	 * @since   4.0.0
	 */
	public function getAttribute(string $key, $default = null)
	{
		if (array_key_exists($key, $this->attributes))
		{
			return $this->attributes[$key];
		}

return $default;
	}

/**
	 * Set the attribute
	 *
	 * @param   string  $key    An attribute key
	 * @param   string  $value  An attribute value
	 *
	 * @return self
	 *
	 * @since   4.0.0
	 */
	public function setAttribute(string $key, $value = null): WebAssetItemInterface
	{
		$this->attributes[$key] = $value;

return $this;
	}

/**
	 * Get all attributes
	 *
	 * @return array
	 *
	 * @since   4.0.0
	 */
	public function getAttributes(): array
	{
		return $this->attributes;
	}

/**
	 * Resolve path
	 *
	 * @param   string  $path  The path to resolve
	 * @param   string  $type  The resolver method
	 *
	 * @return string
	 *
	 * @since  4.0.0
	 */
	protected function resolvePath(string $path, string $type): string
	{
		if ($type !== 'script' && $type !== 'stylesheet')
		{
			throw new \UnexpectedValueException('Unexpected [type], expected "script" or "stylesheet"');
		}

$file     = $path;
		$external = $this->isPathExternal($path);

if (!$external)
		{
			// Get the file path
			$file = HTMLHelper::_(
				$type,
				$path,
				[
					'pathOnly' => true,
					'relative' => !$this->isPathAbsolute($path),
				]
			);
		}

return $file ?? '';
	}

/**
	 * Check if the Path is External
	 *
	 * @param   string  $path  Path to test
	 *
	 * @return  boolean
	 *
	 * @since   4.0.0
	 */
	protected function isPathExternal(string $path): bool
	{
		return strpos($path, 'http://') === 0 || strpos($path, 'https://') === 0 || strpos($path, '//') === 0;
	}

/**
	 * Check if the Path is relative to /media folder or absolute
	 *
	 * @param   string  $path  Path to test
	 *
	 * @return  boolean
	 *
	 * @since   4.0.0
	 */
	protected function isPathAbsolute(string $path): bool
	{
		// We have a full path or not
		return is_file(JPATH_ROOT . '/' . $path);
	}
}