<?php

/*
 * Copyright 2004-2017, AfterLogic Corp.
 * Licensed under AGPLv3 license or AfterLogic license
 * if commercial version of the product was purchased.
 * See the LICENSE file for a full license statement.
 */

namespace MailSo\Mime;

/**
 * @category MailSo
 * @package Mime
 */
class HeaderCollection extends \MailSo\Base\Collection
{
	/**
	 * @return string
	 */
	protected $sRawHeaders;

	/**
	 * @var strign
	 */
	protected $sParentCharset;

	/**
	 * @access protected
	 *
	 * @param string $sRawHeaders = ''
	 * @param bool $bStoreRawHeaders = true
	 */
	protected function __construct($sRawHeaders = '', $bStoreRawHeaders = true)
	{
		parent::__construct();

		$this->sRawHeaders = '';
		$this->sParentCharset = '';

		if (0 < \strlen($sRawHeaders))
		{
			$this->Parse($sRawHeaders, $bStoreRawHeaders);
		}
	}

	/**
	 * @param string $sRawHeaders = ''
	 * @param bool $bStoreRawHeaders = true
	 *
	 * @return \MailSo\Mime\HeaderCollection
	 */
	public static function NewInstance($sRawHeaders = '', $bStoreRawHeaders = true)
	{
		return new self($sRawHeaders, $bStoreRawHeaders);
	}

	/**
	 * @param string $sName
	 * @param string $sValue
	 * @param bool $bToTop = false
	 *
	 * @return \MailSo\Mime\HeaderCollection
	 *
	 * @throws \MailSo\Base\Exceptions\InvalidArgumentException
	 */
	public function AddByName($sName, $sValue, $bToTop = false)
	{
		return $this->Add(Header::NewInstance($sName, $sValue), $bToTop);
	}

	/**
	 * @param string $sName
	 * @param string $sValue
	 * @param bool $bToTop = false
	 *
	 * @return \MailSo\Mime\HeaderCollection
	 *
	 * @throws \MailSo\Base\Exceptions\InvalidArgumentException
	 */
	public function SetByName($sName, $sValue, $bToTop = false)
	{
		return $this->RemoveByName($sName)->Add(Header::NewInstance($sName, $sValue), $bToTop);
	}

	/**
	 * @return \MailSo\Mime\Header | null
	 */
	public function &GetByIndex($iIndex)
	{
		$mResult = null;
		$mResult =& parent::GetByIndex($iIndex);
		return $mResult;
	}

	/**
	 * @param string $sHeaderName
	 * @param bool $bCharsetAutoDetect = false
	 * @return string
	 */
	public function ValueByName($sHeaderName, $bCharsetAutoDetect = false)
	{
		$oHeader = null;
		$oHeader =& $this->GetByName($sHeaderName);
		return (null !== $oHeader) ? ($bCharsetAutoDetect ? $oHeader->ValueWithCharsetAutoDetect() : $oHeader->Value()) : '';
	}

	/**
	 * @param string $sHeaderName
	 * @param bool $bCharsetAutoDetect = false
	 * @return array
	 */
	public function ValuesByName($sHeaderName, $bCharsetAutoDetect = false)
	{
		$aResult = array();
		$oHeader = null;

		$sHeaderNameLower = \strtolower($sHeaderName);
		$aHeaders =& $this->GetAsArray();
		foreach ($aHeaders as /* @var $oHeader \MailSo\Mime\Header */ &$oHeader)
		{
			if ($sHeaderNameLower === \strtolower($oHeader->Name()))
			{
				$aResult[] = $bCharsetAutoDetect ? $oHeader->ValueWithCharsetAutoDetect() : $oHeader->Value();
			}
		}

		return $aResult;
	}

	/**
	 * @param string $sHeaderName
	 *
	 * @return \MailSo\Mime\HeaderCollection
	 */
	public function RemoveByName($sHeaderName)
	{
		$aResult = $this->FilterList(function ($oHeader) use ($sHeaderName) {
			return $oHeader && \strtolower($oHeader->Name()) !== \strtolower($sHeaderName);
		});

		return $this->SetAsArray($aResult);
	}

	/**
	 * @param string $sHeaderName
	 * @param bool $bCharsetAutoDetect = false
	 * @return string
	 */
	public function GetAsEmailCollection($sHeaderName, $bCharsetAutoDetect = false)
	{
		$oResult = null;
		$sValue = $this->ValueByName($sHeaderName, $bCharsetAutoDetect);
		if (0 < \strlen($sValue))
		{
			$oResult = \MailSo\Mime\EmailCollection::NewInstance($sValue);
		}

		return $oResult && 0 < $oResult->Count() ? $oResult : null;
	}

	/**
	 * @param string $sHeaderName
	 * @return \MailSo\Mime\ParameterCollection | null
	 */
	public function ParametersByName($sHeaderName)
	{
		$oParameters = $oHeader = null;
		$oHeader =& $this->GetByName($sHeaderName);
		if ($oHeader)
		{
			$oParameters = $oHeader->Parameters();
		}

		return $oParameters;
	}

	/**
	 * @param string $sHeaderName
	 * @param string $sParamName
	 * @return string
	 */
	public function ParameterValue($sHeaderName, $sParamName)
	{
		$oParameters = $this->ParametersByName($sHeaderName);
		return (null !== $oParameters) ? $oParameters->ParameterValueByName($sParamName) : '';
	}

	/**
	 * @param string $sHeaderName
	 * @return \MailSo\Mime\Header | false
	 */
	public function &GetByName($sHeaderName)
	{
		$oResult = $oHeader = null;

		$sHeaderNameLower = \strtolower($sHeaderName);
		$aHeaders =& $this->GetAsArray();
		foreach ($aHeaders as /* @var $oHeader \MailSo\Mime\Header */ &$oHeader)
		{
			if ($sHeaderNameLower === \strtolower($oHeader->Name()))
			{
				$oResult =& $oHeader;
				break;
			}
		}

		return $oResult;
	}

	/**
	 * @param array $aList
	 * @return \MailSo\Mime\HeaderCollection
	 *
	 * @throws \MailSo\Base\Exceptions\InvalidArgumentException
	 */
	public function SetAsArray($aList)
	{
		parent::SetAsArray($aList);

		return $this;
	}

	/**
	 * @param string $sParentCharset
	 * @return \MailSo\Mime\HeaderCollection
	 */
	public function SetParentCharset($sParentCharset)
	{
		if (0 < \strlen($sParentCharset))
		{
			if ($this->sParentCharset !== $sParentCharset)
			{
				$oHeader = null;
				$aHeaders =& $this->GetAsArray();

				foreach ($aHeaders as /* @var $oHeader \MailSo\Mime\Header */ &$oHeader)
				{
					$oHeader->SetParentCharset($sParentCharset);
				}

				$this->sParentCharset = $sParentCharset;
			}
		}

		return $this;
	}

	/**
	 * @return void
	 */
	public function clear()
	{
		parent::clear();

		$this->sRawHeaders = '';
	}

	/**
	 * @param string $sRawHeaders
	 * @param bool $bStoreRawHeaders = false
	 * @param string $sParentCharset = ''
	 *
	 * @return \MailSo\Mime\HeaderCollection
	 */
	public function Parse($sRawHeaders, $bStoreRawHeaders = false, $sParentCharset = '')
	{
		$this->clear();

		if ($bStoreRawHeaders)
		{
			$this->sRawHeaders = $sRawHeaders;
		}

		if (0 === \strlen($this->sParentCharset))
		{
			$this->sParentCharset = $sParentCharset;
		}

		$aHeaders = \explode("\n", \str_replace("\r", '', $sRawHeaders));

		$sName = null;
		$sValue = null;
		foreach ($aHeaders as $sHeadersValue)
		{
			if (0 === strlen($sHeadersValue))
			{
				continue;
			}

			$sFirstChar = \substr($sHeadersValue, 0, 1);
			if ($sFirstChar !== ' ' && $sFirstChar !== "\t" && false === \strpos($sHeadersValue, ':'))
			{
				continue;
			}
			else if (null !== $sName && ($sFirstChar === ' ' || $sFirstChar === "\t"))
			{
				$sValue = \is_null($sValue) ? '' : $sValue;

				if ('?=' === \substr(\rtrim($sHeadersValue), -2))
				{
					$sHeadersValue = \rtrim($sHeadersValue);
				}

				if ('=?' === \substr(\ltrim($sHeadersValue), 0, 2))
				{
					$sHeadersValue = \ltrim($sHeadersValue);
				}

				if ('=?' === \substr($sHeadersValue, 0, 2))
				{
					$sValue .= $sHeadersValue;
				}
				else
				{
					$sValue .= "\n".$sHeadersValue;
				}
			}
			else
			{
				if (null !== $sName)
				{
					$oHeader = Header::NewInstanceFromEncodedString($sName.': '.$sValue, $this->sParentCharset);
					if ($oHeader)
					{
						$this->Add($oHeader);
					}
					
					$sName = null;
					$sValue = null;
				}

				$aHeaderParts = \explode(':', $sHeadersValue, 2);
				$sName = $aHeaderParts[0];
				$sValue = isset($aHeaderParts[1]) ? $aHeaderParts[1] : '';

				if ('?=' === \substr(\rtrim($sValue), -2))
				{
					$sValue = \rtrim($sValue);
				}
			}
		}

		if (null !== $sName)
		{
			$oHeader = Header::NewInstanceFromEncodedString($sName.': '.$sValue, $this->sParentCharset);
			if ($oHeader)
			{
				$this->Add($oHeader);
			}
		}

		return $this;
	}

	/**
	 * @return string
	 */
	public function ToEncodedString()
	{
		$aResult = array();
		$aHeaders =& $this->GetAsArray();
		foreach ($aHeaders as /* @var $oHeader \MailSo\Mime\Header */ &$oHeader)
		{
			$aResult[] = $oHeader->EncodedValue();
		}

		return \implode(\MailSo\Mime\Enumerations\Constants::CRLF, $aResult);
	}
}
