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<?php

require_once("include/oembed.php");
require_once("include/event.php");
require_once("library/markdown.php");
require_once("include/html2bbcode.php");
require_once("include/bbcode.php");
require_once("include/markdownify/markdownify.php");


function get_bb_tag_pos($s, $name, $occurance = 1) {

if($occurance < 1)
$occurance = 1;

$start_open = -1;
for($i = 1; $i <= $occurance; $i++) {
if( $start_open !== false)
$start_open = strpos($s, '[' . $name, $start_open + 1); // allow [name= type tags
}

if( $start_open === false)
return false;

$start_equal = strpos($s, '=', $start_open);
$start_close = strpos($s, ']', $start_open);

if( $start_close === false)
return false;

$start_close++;

$end_open = strpos($s, '[/' . $name . ']', $start_close);

if( $end_open === false)
return false;

$res = array( 'start' => array('open' => $start_open, 'close' => $start_close),
'end' => array('open' => $end_open, 'close' => $end_open + strlen('[/' . $name . ']')) );
if( $start_equal !== false)
$res['start']['equal'] = $start_equal + 1;

return $res;
}

function bb_tag_preg_replace($pattern, $replace, $name, $s) {

$string = $s;

$occurance = 1;
$pos = get_bb_tag_pos($string, $name, $occurance);
while($pos !== false && $occurance < 1000) {

$start = substr($string, 0, $pos['start']['open']);
$subject = substr($string, $pos['start']['open'], $pos['end']['close'] - $pos['start']['open']);
$end = substr($string, $pos['end']['close']);
if($end === false)
$end = '';

$subject = preg_replace($pattern, $replace, $subject);
$string = $start . $subject . $end;

$occurance++;
$pos = get_bb_tag_pos($string, $name, $occurance);
}

return $string;
}

// we don't want to support a bbcode specific markdown interpreter
// and the markdown library we have is pretty good, but provides HTML output.
// So we'll use that to convert to HTML, then convert the HTML back to bbcode,
// and then clean up a few Diaspora specific constructs.

function diaspora2bb($s) {

// for testing purposes: Collect raw markdown articles
// $file = tempnam("/tmp/friendica/", "markdown");
// file_put_contents($file, $s);

$s = html_entity_decode($s,ENT_COMPAT,'UTF-8');

// Too many new lines. So deactivated the following line
// $s = str_replace("\r","\n",$s);
// Simply remove cr.
$s = str_replace("\r","",$s);

// <br/> is invalid. Replace it with the valid expression
$s = str_replace("<br/>","<br />",$s);

$s = preg_replace('/\@\{(.+?)\; (.+?)\@(.+?)\}/','@[url=https://$3/u/$2]$1[/url]',$s);

// Escaping the hash tags - doesn't always seem to work
// $s = preg_replace('/\#([^\s\#])/','\\#$1',$s);
// This seems to work
$s = preg_replace('/\#([^\s\#])/','&#35;$1',$s);

$s = Markdown($s);

$s = str_replace('&#35;','#',$s);
// we seem to have double linebreaks
// $s = str_replace("\n",'<br />',$s);

$s = html2bbcode($s);
// $s = str_replace('&#42;','*',$s);

// protect the recycle symbol from turning into a tag, but without unescaping angles and naked ampersands
$s = str_replace('&#x2672;',html_entity_decode('&#x2672;',ENT_QUOTES,'UTF-8'),$s);

// Convert everything that looks like a link to a link
$s = preg_replace("/([^\]\=]|^)(https?\:\/\/)([a-zA-Z0-9\:\/\-\?\&\;\.\=\_\~\#\%\$\!\+\,]+)/ism", '$1[url=$2$3]$2$3[/url]',$s);

//$s = preg_replace("/([^\]\=]|^)(https?\:\/\/)(vimeo|youtu|www\.youtube|soundcloud)([a-zA-Z0-9\:\/\-\?\&\;\.\=\_\~\#\%\$\!\+\,]+)/ism", '$1[url=$2$3$4]$2$3$4[/url]',$s);
$s = bb_tag_preg_replace("/\[url\=?(.*?)\]https?:\/\/www.youtube.com\/watch\?v\=(.*?)\[\/url\]/ism",'[youtube]$2[/youtube]','url',$s);
$s = bb_tag_preg_replace("/\[url\=https?:\/\/www.youtube.com\/watch\?v\=(.*?)\].*?\[\/url\]/ism",'[youtube]$1[/youtube]','url',$s);
$s = bb_tag_preg_replace("/\[url\=?(.*?)\]https?:\/ \/vimeo.com\/([0-9]+)(.*?)\[\/url\]/ism",'[vimeo]$2[/vimeo]','url',$s);
$s = bb_tag_preg_replace("/\[url\=https?:\/\/vimeo.com\/([0-9]+)\](.*?)\[\/url\]/ism",'[vimeo]$1[/vimeo]','url',$s);
// remove duplicate adjacent code tags
$s = preg_replace("/(\[code\])+(.*?)(\[\/code\])+/ism","[code]$2[/code]", $s);

// Don't show link to full picture (until it is fixed)
$s = scale_external_images($s, false);

return $s;
}


function stripdcode_br_cb($s) {
return '[code]' . str_replace('<br />', "\n\t", $s[1]) . '[/code]';
}


//////////////////////
// The following "diaspora_ul" and "diaspora_ol" are only appropriate for the
// pre-Markdownify conversion. If Markdownify isn't used, use the non-Markdownify
// versions below
//////////////////////
/*
function diaspora_ul($s) {
// Replace "[*]" followed by any number (including zero) of
// spaces by "* " to match Diaspora's list format
if( strpos($s[0], "[list]") === 0 )
return '<ul class="listbullet" style="list-style-type: circle;">' . preg_replace("/\[\*\]( *)/", "* ", $s[1]) . '</ul>';
elseif( strpos($s[0], "[ul]") === 0 )
return '<ul class="listbullet" style="list-style-type: circle;">' . preg_replace("/\[\*\]( *)/", "* ", $s[1]) . '</ul>';
else
return $s[0];
}


function diaspora_ol($s) {
// A hack: Diaspora will create a properly-numbered ordered list even
// if you use '1.' for each element of the list, like:
// 1. First element
// 1. Second element
// 1. Third element
if( strpos($s[0], "[list=1]") === 0 )
return '<ul class="listdecimal" style="list-style-type: decimal;">' . preg_replace("/\[\*\]( *)/", "1. ", $s[1]) . '</ul>';
elseif( strpos($s[0], "[list=i]") === 0 )
return '<ul class="listlowerroman" style="list-style-type: lower-roman;">' . preg_replace("/\[\*\]( *)/", "1. ", $s[1]) . '</ul>';
elseif( strpos($s[0], "[list=I]") === 0 )
return '<ul class="listupperroman" style="list-style-type: upper-roman;">' . preg_replace("/\[\*\]( *)/", "1. ", $s[1]) . '</ul>';
elseif( strpos($s[0], "[list=a]") === 0 )
return '<ul class="listloweralpha" style="list-style-type: lower-alpha;">' . preg_replace("/\[\*\]( *)/", "1. ", $s[1]) . '</ul>';
elseif( strpos($s[0], "[list=A]") === 0 )
return '<ul class="listupperalpha" style="list-style-type: upper-alpha;">' . preg_replace("/\[\*\]( *)/", "1. ", $s[1]) . '</ul>';
elseif( strpos($s[0], "[ol]") === 0 )
return '<ul class="listdecimal" style="list-style-type: decimal;">' . preg_replace("/\[\*\]( *)/", "1. ", $s[1]) . '</ul>';
else
return $s[0];
}
*/

//////////////////////
// Non-Markdownify versions of "diaspora_ol" and "diaspora_ul"
//////////////////////
function diaspora_ul($s) {
// Replace "[\\*]" followed by any number (including zero) of
// spaces by "* " to match Diaspora's list format
return preg_replace("/\[\\\\\*\]( *)/", "* ", $s[1]);
}

function diaspora_ol($s) {
// A hack: Diaspora will create a properly-numbered ordered list even
// if you use '1.' for each element of the list, like:
// 1. First element
// 1. Second element
// 1. Third element
return preg_replace("/\[\\\\\*\]( *)/", "1. ", $s[1]);
}


function bb2diaspora($Text,$preserve_nl = false, $fordiaspora = true) {

// Re-enabling the converter again.
// The bbcode parser now handles youtube-links (and the other stuff) correctly.
// Additionally the html code is now fixed so that lists are now working.

// Converting images with size parameters to simple images. Markdown doesn't know it.
$Text = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $Text);

// the following was added on 10-January-2012 due to an inability of Diaspora's
// new javascript markdown processor to handle links with images as the link "text"
// It is not optimal and may be removed if this ability is restored in the future
if ($fordiaspora)
$Text = preg_replace("/\[url\=([^\[\]]*)\]\s*\[img\](.*?)\[\/img\]\s*\[\/url\]/ism",
"[url]$1[/url]\n[img]$2[/img]", $Text);

// Convert it to HTML - don't try oembed
$Text = bbcode($Text, $preserve_nl, false);

// Now convert HTML to Markdown
$md = new Markdownify(false, false, false);
$Text = $md->parseString($Text);

// If the text going into bbcode() has a plain URL in it, i.e.
// with no [url] tags around it, it will come out of parseString()
// looking like: <http://url.com>, which gets removed by strip_tags().
// So take off the angle brackets of any such URL
$Text = preg_replace("/<http(.*?)>/is", "http$1", $Text);

// Remove all unconverted tags
$Text = strip_tags($Text);


/* Old routine

$ev = bbtoevent($Text);

// Replace any html brackets with HTML Entities to prevent executing HTML or script
// Don't use strip_tags here because it breaks [url] search by replacing & with amp

$Text = str_replace("<", "&lt;", $Text);
$Text = str_replace(">", "&gt;", $Text);

// If we find any event code, turn it into an event.
// After we're finished processing the bbcode we'll
// replace all of the event code with a reformatted version.

if($preserve_nl)
$Text = str_replace(array("\n","\r"), array('',''),$Text);
else
// Remove the "return" character, as Diaspora uses only the "newline"
// character, so having the "return" character can cause signature
// failures
$Text = str_replace("\r", "", $Text);


// Set up the parameters for a URL search string
$URLSearchString = "^\[\]";
// Set up the parameters for a MAIL search string
$MAILSearchString = $URLSearchString;

// Perform URL Search

// [img]pathtoimage[/img]

// the following was added on 10-January-2012 due to an inability of Diaspora's
// new javascript markdown processor to handle links with images as the link "text"
// It is not optimal and may be removed if this ability is restored in the future

$Text = preg_replace("/\[url\=([$URLSearchString]*)\]\[img\](.*?)\[\/img\]\[\/url\]/ism",
'![' . t('image/photo') . '](' . '$2' . ')' . "\n" . '[' . t('link') . '](' . '$1' . ')', $Text);

$Text = preg_replace("/\[bookmark\]([$URLSearchString]*)\[\/bookmark\]/ism", '[$1]($1)', $Text);
$Text = preg_replace("/\[bookmark\=([$URLSearchString]*)\](.*?)\[\/bookmark\]/ism", '[$2]($1)', $Text);

$Text = preg_replace("/\[url\]([$URLSearchString]*)\[\/url\]/ism", '[$1]($1)', $Text);
$Text = preg_replace("/\#\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism", '[#$2]($1)', $Text);
$Text = preg_replace("/\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism", '[$2]($1)', $Text);


$Text = preg_replace("/\[img\](.*?)\[\/img\]/", '![' . t('image/photo') . '](' . '$1' . ')', $Text);
$Text = preg_replace("/\[img\=(.*?)\](.*?)\[\/img\]/", '![' . t('image/photo') . '](' . '$2' . ')', $Text);

// Perform MAIL Search
$Text = preg_replace("(\[mail\]([$MAILSearchString]*)\[/mail\])", '[$1](mailto:$1)', $Text);
$Text = preg_replace("/\[mail\=([$MAILSearchString]*)\](.*?)\[\/mail\]/", '[$2](mailto:$1)', $Text);

$Text = str_replace('*', '\\*', $Text);
$Text = str_replace('_', '\\_', $Text);

$Text = str_replace('`','\\`', $Text);

// Check for bold text
$Text = preg_replace("(\[b\](.*?)\[\/b\])is",'**$1**',$Text);

// Check for italics text
$Text = preg_replace("(\[i\](.*?)\[\/i\])is",'_$1_',$Text);

// Check for underline text
// Replace with italics since Diaspora doesn't have underline
$Text = preg_replace("(\[u\](.*?)\[\/u\])is",'_$1_',$Text);

// Check for strike-through text
$Text = preg_replace("(\[s\](.*?)\[\/s\])is",'**[strike]**$1**[/strike]**',$Text);

// Check for over-line text
// $Text = preg_replace("(\[o\](.*?)\[\/o\])is",'<span class="overline">$1</span>',$Text);

// Check for colored text
// Remove color since Diaspora doesn't support it
$Text = preg_replace("(\[color=(.*?)\](.*?)\[\/color\])is","$2",$Text);

// Check for sized text
// Remove it since Diaspora doesn't support sizes very well
$Text = preg_replace("(\[size=(.*?)\](.*?)\[\/size\])is","$2",$Text);

// Check for list text
$endlessloop = 0;
while ((((strpos($Text, "[/list]") !== false) && (strpos($Text, "[list") !== false)) ||
((strpos($Text, "[/ol]") !== false) && (strpos($Text, "[ol]") !== false)) ||
((strpos($Text, "[/ul]") !== false) && (strpos($Text, "[ul]") !== false)) ||
((strpos($Text, "[/li]") !== false) && (strpos($Text, "[li]") !== false))) && (++$endlessloop < 20)) {
$Text = preg_replace_callback("/\[list\](.*?)\[\/list\]/is", 'diaspora_ul', $Text);
$Text = preg_replace_callback("/\[list=1\](.*?)\[\/list\]/is", 'diaspora_ol', $Text);
$Text = preg_replace_callback("/\[list=i\](.*?)\[\/list\]/s",'diaspora_ol', $Text);
$Text = preg_replace_callback("/\[list=I\](.*?)\[\/list\]/s", 'diaspora_ol', $Text);
$Text = preg_replace_callback("/\[list=a\](.*?)\[\/list\]/s", 'diaspora_ol', $Text);
$Text = preg_replace_callback("/\[list=A\](.*?)\[\/list\]/s", 'diaspora_ol', $Text);
$Text = preg_replace_callback("/\[ul\](.*?)\[\/ul\]/is", 'diaspora_ul', $Text);
$Text = preg_replace_callback("/\[ol\](.*?)\[\/ol\]/is", 'diaspora_ol', $Text);
$Text = preg_replace("/\[li\]( *)(.*?)\[\/li\]/s", '* $2' ,$Text);
}

// Just get rid of table tags since Diaspora doesn't support tables
$Text = preg_replace("/\[th\](.*?)\[\/th\]/s", '$1' ,$Text);
$Text = preg_replace("/\[td\](.*?)\[\/td\]/s", '$1' ,$Text);
$Text = preg_replace("/\[tr\](.*?)\[\/tr\]/s", '$1' ,$Text);
$Text = preg_replace("/\[table\](.*?)\[\/table\]/s", '$1' ,$Text);

$Text = preg_replace("/\[table border=(.*?)\](.*?)\[\/table\]/s", '$2' ,$Text);
// $Text = preg_replace("/\[table border=0\](.*?)\[\/table\]/s", '<table border="0" >$1</table>' ,$Text);


// $Text = str_replace("[*]", "<li>", $Text);

// Check for font change text
// $Text = preg_replace("(\[font=(.*?)\](.*?)\[\/font\])","<span style=\"font-family: $1;\">$2</span>",$Text);


$Text = preg_replace_callback("/\[code\](.*?)\[\/code\]/is",'stripdcode_br_cb',$Text);

// Check for [code] text
$Text = preg_replace("/(\[code\])+(.*?)(\[\/code\])+/is","\t$2\n", $Text);




// Declare the format for [quote] layout
// $QuoteLayout = '<blockquote>$1</blockquote>';
// Check for [quote] text
$Text = preg_replace("/\[quote\](.*?)\[\/quote\]/is",">$1\n\n", $Text);
$Text = preg_replace("/\[quote=(.*?)\](.*?)\[\/quote\]/is",">$2\n\n", $Text);

// Images

// html5 video and audio

$Text = preg_replace("/\[video\](.*?)\[\/video\]/", '$1', $Text);

$Text = preg_replace("/\[audio\](.*?)\[\/audio\]/", '$1', $Text);

// $Text = preg_replace("/\[iframe\](.*?)\[\/iframe\]/", '<iframe src="$1" width="425" height="350"><a href="$1">$1</a></iframe>', $Text);

// [img=widthxheight]image source[/img]
// $Text = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/", '<img src="$3" style="height:{$2}px; width:{$1}px;" >', $Text);

$Text = preg_replace("/\[youtube\]https?:\/\/www.youtube.com\/watch\?v\=(.*?)\[\/youtube\]/ism",'http://www.youtube.com/watch?v=$1',$Text);
$Text = preg_replace("/\[youtube\]https?:\/\/www.youtube.com\/embed\/(.*?)\[\/youtube\]/ism",'http://www.youtube.com/watch?v=$1',$Text);
$Text = preg_replace("/\[youtube\]https?:\/\/youtu.be\/(.*?)\[\/youtube\]/ism",'http://www.youtube.com/watch?v=$1',$Text);
$Text = preg_replace("/\[youtube\]([A-Za-z0-9\-_=]+)(.*?)\[\/youtube\]/ism", 'http://www.youtube.com/watch?v=$1', $Text);

$Text = preg_replace("/\[vimeo\]https?:\/\/player.vimeo.com\/video\/([0-9]+)(.*?)\[\/vimeo\]/ism",'http://vimeo.com/$1',$Text);
$Text = preg_replace("/\[vimeo\]https?:\/\/vimeo.com\/([0-9]+)(.*?)\[\/vimeo\]/ism",'http://vimeo.com/$1',$Text);
$Text = preg_replace("/\[vimeo\]([0-9]+)(.*?)\[\/vimeo\]/ism", 'http://vimeo.com/$1',$Text);


$Text = str_replace('[nosmile]','',$Text);

// oembed tag
// $Text = oembed_bbcode2html($Text);

// If we found an event earlier, strip out all the event code and replace with a reformatted version.

if(x($ev,'start')) {

$sub = format_event_diaspora($ev);

$Text = preg_replace("/\[event\-summary\](.*?)\[\/event\-summary\]/is",'',$Text);
$Text = preg_replace("/\[event\-description\](.*?)\[\/event\-description\]/is",'',$Text);
$Text = preg_replace("/\[event\-start\](.*?)\[\/event\-start\]/is",$sub,$Text);
$Text = preg_replace("/\[event\-finish\](.*?)\[\/event\-finish\]/is",'',$Text);
$Text = preg_replace("/\[event\-location\](.*?)\[\/event\-location\]/is",'',$Text);
$Text = preg_replace("/\[event\-adjust\](.*?)\[\/event\-adjust\]/is",'',$Text);
}

$Text = preg_replace("/\<(.*?)(src|href)=(.*?)\&amp\;(.*?)\>/ism",'<$1$2=$3&$4>',$Text);

$Text = preg_replace_callback('/\[(.*?)\]\((.*?)\)/ism','unescape_underscores_in_links',$Text);

*/

// Remove any leading or trailing whitespace, as this will mess up
// the Diaspora signature verification and cause the item to disappear
$Text = trim($Text);

call_hooks('bb2diaspora',$Text);

return $Text;
}

function unescape_underscores_in_links($m) {
$y = str_replace('\\_','_', $m[2]);
return('[' . $m[1] . '](' . $y . ')');
}

function format_event_diaspora($ev) {

$a = get_app();

if(! ((is_array($ev)) && count($ev)))
return '';

$bd_format = t('l F d, Y \@ g:i A') ; // Friday January 18, 2011 @ 8 AM

$o = 'Friendica event notification:' . "\n";

$o .= '**' . (($ev['summary']) ? bb2diaspora($ev['summary']) : bb2diaspora($ev['desc'])) . '**' . "\n";

$o .= t('Starts:') . ' ' . '['
. (($ev['adjust']) ? day_translate(datetime_convert('UTC', 'UTC',
$ev['start'] , $bd_format ))
: day_translate(datetime_convert('UTC', 'UTC',
$ev['start'] , $bd_format)))
. '](' . $a->get_baseurl() . '/localtime/?f=&time=' . urlencode(datetime_convert('UTC','UTC',$ev['start'])) . ")\n";

if(! $ev['nofinish'])
$o .= t('Finishes:') . ' ' . '['
. (($ev['adjust']) ? day_translate(datetime_convert('UTC', 'UTC',
$ev['finish'] , $bd_format ))
: day_translate(datetime_convert('UTC', 'UTC',
$ev['finish'] , $bd_format )))
. '](' . $a->get_baseurl() . '/localtime/?f=&time=' . urlencode(datetime_convert('UTC','UTC',$ev['finish'])) . ")\n";

if(strlen($ev['location']))
$o .= t('Location:') . bb2diaspora($ev['location'])
. "\n";

$o .= "\n";
return $o;
}
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