<?php

/**
 * LICENSE: Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 * PHP version 5
 *
 * @category  Microsoft
 * @package   WindowsAzure\Common\Internal
 * @author    Azure PHP SDK <azurephpsdk@microsoft.com>
 * @copyright 2012 Microsoft Corporation
 * @license   http://www.apache.org/licenses/LICENSE-2.0  Apache License 2.0
 * @link      https://github.com/windowsazure/azure-sdk-for-php
 */
 
namespace WindowsAzure\Common\Internal;
use WindowsAzure\Common\Internal\ConnectionStringParser;
use WindowsAzure\Common\Internal\Resources;

/**
 * Represents the settings used to sign and access a request against the storage 
 * service. For more information about storage service connection strings check this
 * page: http://msdn.microsoft.com/en-us/library/ee758697
 *
 * @category  Microsoft
 * @package   WindowsAzure\Common\Internal
 * @author    Azure PHP SDK <azurephpsdk@microsoft.com>
 * @copyright 2012 Microsoft Corporation
 * @license   http://www.apache.org/licenses/LICENSE-2.0  Apache License 2.0
 * @version   Release: 0.4.1_2015-03
 * @link      https://github.com/windowsazure/azure-sdk-for-php
 */
class StorageServiceSettings extends ServiceSettings
{
    /**
     * The storage service name.
     * 
     * @var string
     */
    private $_name;
    
    /**
     * A base64 representation.
     * 
     * @var string
     */
    private $_key;
    
    /**
     * The endpoint for the blob service.
     * 
     * @var string
     */
    private $_blobEndpointUri;
    
    /**
     * The endpoint for the queue service.
     * 
     * @var string
     */
    private $_queueEndpointUri;
    
    /**
     * The endpoint for the table service.
     * 
     * @var string
     */
    private $_tableEndpointUri;
    
    /**
     * @var StorageServiceSettings
     */
    private static $_devStoreAccount;
    
    /**
     * Validator for the UseDevelopmentStorage setting. Must be "true".
     * 
     * @var array
     */
    private static $_useDevelopmentStorageSetting;
    
    /**
     * Validator for the DevelopmentStorageProxyUri setting. Must be a valid Uri.
     * 
     * @var array
     */
    private static $_developmentStorageProxyUriSetting;
    
    /**
     * Validator for the DefaultEndpointsProtocol setting. Must be either "http" 
     * or "https".
     * 
     * @var array
     */
    private static $_defaultEndpointsProtocolSetting;
    
    /**
     * Validator for the AccountName setting. No restrictions.
     * 
     * @var array
     */
    private static $_accountNameSetting;
    
    /**
     * Validator for the AccountKey setting. Must be a valid base64 string.
     * 
     * @var array
     */
    private static $_accountKeySetting;
    
    /**
     * Validator for the BlobEndpoint setting. Must be a valid Uri.
     * 
     * @var array
     */
    private static $_blobEndpointSetting;
    
    /**
     * Validator for the QueueEndpoint setting. Must be a valid Uri.
     * 
     * @var array
     */
    private static $_queueEndpointSetting;
    
    /**
     * Validator for the TableEndpoint setting. Must be a valid Uri.
     * 
     * @var array
     */
    private static $_tableEndpointSetting;
    
    /**
     * @var boolean
     */
    protected static $isInitialized = false;
    
    /**
     * Holds the expected setting keys.
     * 
     * @var array
     */
    protected static $validSettingKeys = array();
    
    /**
     * Initializes static members of the class.
     * 
     * @return none
     */
    protected static function init()
    {
        self::$_useDevelopmentStorageSetting = self::setting(
            Resources::USE_DEVELOPMENT_STORAGE_NAME,
            'true'
        );
        
        self::$_developmentStorageProxyUriSetting = self::settingWithFunc(
            Resources::DEVELOPMENT_STORAGE_PROXY_URI_NAME,
            Validate::getIsValidUri()
        );
        
        self::$_defaultEndpointsProtocolSetting = self::setting(
            Resources::DEFAULT_ENDPOINTS_PROTOCOL_NAME,
            'http', 'https'
        );
        
        self::$_accountNameSetting = self::setting(Resources::ACCOUNT_NAME_NAME);
        
        self::$_accountKeySetting = self::settingWithFunc(
            Resources::ACCOUNT_KEY_NAME,
            // base64_decode will return false if the $key is not in base64 format.
            function ($key) {
                $isValidBase64String = base64_decode($key, true);
                if ($isValidBase64String) {
                    return true;
                } else {
                    throw new \RuntimeException(
                        sprintf(Resources::INVALID_ACCOUNT_KEY_FORMAT, $key)
                    );
                }
            }
        );
        
        self::$_blobEndpointSetting = self::settingWithFunc(
            Resources::BLOB_ENDPOINT_NAME,
            Validate::getIsValidUri()
        );
        
        self::$_queueEndpointSetting = self::settingWithFunc(
            Resources::QUEUE_ENDPOINT_NAME,
            Validate::getIsValidUri()
        );
        
        self::$_tableEndpointSetting = self::settingWithFunc(
            Resources::TABLE_ENDPOINT_NAME,
            Validate::getIsValidUri()
        );
        
        self::$validSettingKeys[] = Resources::USE_DEVELOPMENT_STORAGE_NAME;
        self::$validSettingKeys[] = Resources::DEVELOPMENT_STORAGE_PROXY_URI_NAME;
        self::$validSettingKeys[] = Resources::DEFAULT_ENDPOINTS_PROTOCOL_NAME;
        self::$validSettingKeys[] = Resources::ACCOUNT_NAME_NAME;
        self::$validSettingKeys[] = Resources::ACCOUNT_KEY_NAME;
        self::$validSettingKeys[] = Resources::BLOB_ENDPOINT_NAME;
        self::$validSettingKeys[] = Resources::QUEUE_ENDPOINT_NAME;
        self::$validSettingKeys[] = Resources::TABLE_ENDPOINT_NAME;
    }
    
    /**
     * Creates new storage service settings instance.
     * 
     * @param string $name             The storage service name.
     * @param string $key              The storage service key.
     * @param string $blobEndpointUri  The sotrage service blob endpoint.
     * @param string $queueEndpointUri The sotrage service queue endpoint.
     * @param string $tableEndpointUri The sotrage service table endpoint.
     */
    public function __construct(
        $name,
        $key,
        $blobEndpointUri,
        $queueEndpointUri,
        $tableEndpointUri
    ) {
        $this->_name             = $name;
        $this->_key              = $key;
        $this->_blobEndpointUri  = $blobEndpointUri;
        $this->_queueEndpointUri = $queueEndpointUri;
        $this->_tableEndpointUri = $tableEndpointUri;
    }
    
    /**
     * Returns a StorageServiceSettings with development storage credentials using 
     * the specified proxy Uri.
     * 
     * @param string $proxyUri The proxy endpoint to use.
     * 
     * @return StorageServiceSettings
     */
    private static function _getDevelopmentStorageAccount($proxyUri)
    {
        if (is_null($proxyUri)) {
            return self::developmentStorageAccount();
        }
        
        $scheme = parse_url($proxyUri, PHP_URL_SCHEME);
        $host   = parse_url($proxyUri, PHP_URL_HOST);
        $prefix = $scheme . "://" . $host;
        
        return new StorageServiceSettings(
            Resources::DEV_STORE_NAME,
            Resources::DEV_STORE_KEY,
            $prefix . ':10000/devstoreaccount1/',
            $prefix . ':10001/devstoreaccount1/',
            $prefix . ':10002/devstoreaccount1/'
        );
    }
    
    /**
     * Gets a StorageServiceSettings object that references the development storage 
     * account.
     * 
     * @return StorageServiceSettings 
     */
    public static function developmentStorageAccount()
    {
        if (is_null(self::$_devStoreAccount)) {
            self::$_devStoreAccount = self::_getDevelopmentStorageAccount(
                Resources::DEV_STORE_URI
            );
        }
        
        return self::$_devStoreAccount;
    }
    
    /**
     * Gets the default service endpoint using the specified protocol and account 
     * name.
     * 
     * @param array  $settings The service settings.
     * @param string $dns      The service DNS.
     * 
     * @return string
     */
    private static function _getDefaultServiceEndpoint($settings, $dns)
    {
        $scheme      = Utilities::tryGetValueInsensitive(
            Resources::DEFAULT_ENDPOINTS_PROTOCOL_NAME,
            $settings
        );
        $accountName = Utilities::tryGetValueInsensitive(
            Resources::ACCOUNT_NAME_NAME,
            $settings
        );
        
        return sprintf(Resources::SERVICE_URI_FORMAT, $scheme, $accountName, $dns);
    }
    
    /**
     * Creates StorageServiceSettings object given endpoints uri.
     * 
     * @param array  $settings         The service settings.
     * @param string $blobEndpointUri  The blob endpoint uri.
     * @param string $queueEndpointUri The queue endpoint uri.
     * @param string $tableEndpointUri The table endpoint uri.
     * 
     * @return \WindowsAzure\Common\Internal\StorageServiceSettings
     */
    private static function _createStorageServiceSettings(
        $settings,
        $blobEndpointUri = null,
        $queueEndpointUri = null,
        $tableEndpointUri = null
    ) {
        $blobEndpointUri  = Utilities::tryGetValueInsensitive(
            Resources::BLOB_ENDPOINT_NAME,
            $settings,
            $blobEndpointUri
        );
        $queueEndpointUri = Utilities::tryGetValueInsensitive(
            Resources::QUEUE_ENDPOINT_NAME,
            $settings,
            $queueEndpointUri
        );
        $tableEndpointUri = Utilities::tryGetValueInsensitive(
            Resources::TABLE_ENDPOINT_NAME,
            $settings,
            $tableEndpointUri
        );
        $accountName      = Utilities::tryGetValueInsensitive(
            Resources::ACCOUNT_NAME_NAME,
            $settings
        );
        $accountKey       = Utilities::tryGetValueInsensitive(
            Resources::ACCOUNT_KEY_NAME,
            $settings
        );
            
        return new StorageServiceSettings(
            $accountName,
            $accountKey,
            $blobEndpointUri,
            $queueEndpointUri,
            $tableEndpointUri
        );
    }

    /**
     * Creates a StorageServiceSettings object from the given connection string.
     * 
     * @param string $connectionString The storage settings connection string.
     * 
     * @return StorageServiceSettings 
     */
    public static function createFromConnectionString($connectionString)
    {
        $tokenizedSettings = self::parseAndValidateKeys($connectionString);
        
        // Devstore case
        $matchedSpecs = self::matchedSpecification(
            $tokenizedSettings,
            self::allRequired(self::$_useDevelopmentStorageSetting),
            self::optional(self::$_developmentStorageProxyUriSetting)
        );
        if ($matchedSpecs) {
            $proxyUri = Utilities::tryGetValueInsensitive(
                Resources::DEVELOPMENT_STORAGE_PROXY_URI_NAME,
                $tokenizedSettings
            );
            
            return self::_getDevelopmentStorageAccount($proxyUri);
        }
        
        // Automatic case
        $matchedSpecs = self::matchedSpecification(
            $tokenizedSettings,
            self::allRequired(
                self::$_defaultEndpointsProtocolSetting,
                self::$_accountNameSetting,
                self::$_accountKeySetting
            ),
            self::optional(
                self::$_blobEndpointSetting,
                self::$_queueEndpointSetting,
                self::$_tableEndpointSetting
            )
        );
        if ($matchedSpecs) {
            return self::_createStorageServiceSettings(
                $tokenizedSettings,
                self::_getDefaultServiceEndpoint(
                    $tokenizedSettings,
                    Resources::BLOB_BASE_DNS_NAME
                ),
                self::_getDefaultServiceEndpoint(
                    $tokenizedSettings,
                    Resources::QUEUE_BASE_DNS_NAME
                ),
                self::_getDefaultServiceEndpoint(
                    $tokenizedSettings,
                    Resources::TABLE_BASE_DNS_NAME
                )
            );
        }
        
        // Explicit case
        $matchedSpecs = self::matchedSpecification(
            $tokenizedSettings,
            self::atLeastOne(
                self::$_blobEndpointSetting,
                self::$_queueEndpointSetting,
                self::$_tableEndpointSetting
            ),
            self::allRequired(
                self::$_accountNameSetting,
                self::$_accountKeySetting
            )
        );
        if ($matchedSpecs) {
            return self::_createStorageServiceSettings($tokenizedSettings);
        }
        
        self::noMatch($connectionString);
    }
    
    /**
     * Gets storage service name.
     * 
     * @return string
     */
    public function getName()
    {
        return $this->_name;
    }
    
    /**
     * Gets storage service key.
     * 
     * @return string
     */
    public function getKey()
    {
        return $this->_key;
    }
    
    /**
     * Gets storage service blob endpoint uri.
     * 
     * @return string
     */
    public function getBlobEndpointUri()
    {
        return $this->_blobEndpointUri;
    }
    
    /**
     * Gets storage service queue endpoint uri.
     * 
     * @return string
     */
    public function getQueueEndpointUri()
    {
        return $this->_queueEndpointUri;
    }

    /**
     * Gets storage service table endpoint uri.
     * 
     * @return string
     */
    public function getTableEndpointUri()
    {
        return $this->_tableEndpointUri;
    }
}