#include <tinyxml2.h>
#include "App.h"
#include "Entry.h"
#include "Config.h"
#include "Util.h"
#include "Feed.h"

Feed::Feed ( BString path )
{
	title = BString( "Untitled Feed" );
	description = BString( "Nondescript, N/A." );
	homeUrl = BString("");
	xmlUrl = BString("");
	updated = true;
	fetched = false;
	inputPath = path;
	SetCachePath( path );
}

Feed::Feed ( )
{
	title = BString("");
	description = BString("");
	homeUrl = BString("");
	xmlUrl = BString("");
}

// ----------------------------------------------------------------------------

void
Feed::Parse ( )
{
	BFile* feedFile = new BFile( GetCachePath().String(), B_READ_ONLY );
	time_t tt_lastDate = 0;
	BDateTime attrLastDate = BDateTime();

	feedFile->ReadAttr( "LastDate", B_TIME_TYPE, 0, &tt_lastDate, sizeof(time_t) );
	if ( tt_lastDate > 0 && ((App*)be_app)->cfg->updateFeeds == true ) {
		attrLastDate.SetTime_t( tt_lastDate );
		minDate = attrLastDate;
	}
}

// -------------------------------------

// -------------------------------------

// Download a remote feed's XML to the cache path.
BString
Feed::FetchRemoteFeed ( )
{
	BUrl givenUrl = BUrl( inputPath );
	time_t tt_lastDate = 0;
	BDateTime* lastDate = new BDateTime();
	BString* newHash = new BString();
	char oldHash[41];

	BFile* cacheFile = new BFile( GetCachePath(), B_READ_WRITE | B_CREATE_FILE );

	cacheFile->ReadAttr( "LastHash", B_STRING_TYPE, 0, oldHash, 41 );

	if ( ((App*)be_app)->cfg->verbose )
		printf( "Saving %s...\n", inputPath.String() );

	webFetch( BUrl(inputPath), cacheFile, newHash );

	cacheFile->WriteAttr( "LastHash", B_STRING_TYPE, 0,
			      newHash->String(), newHash->CountChars() );

	if ( *(newHash) == BString(oldHash) )
		updated = false;

	fetched = true;
	return GetCachePath();
}

// ----------------------------------------------------------------------------

// return whether or not the feed's given URI/path is remote.
bool
Feed::IsRemote ( )
{
	return isRemotePath( inputPath );
}

// return whether or not the feed seems to have been updated
bool
Feed::IsUpdated ( )
{
	return updated;
}

// return whether or not feed is RSS
bool
Feed::IsRss ( )
{
	EnsureCached();
	tinyxml2::XMLDocument xml;
	xml.LoadFile( GetCachePath().String() );

	if ( xml.FirstChildElement("rss") )
		return true;
	return false;
}

// return whether or not feed is Atom
bool
Feed::IsAtom ( )
{
	tinyxml2::XMLDocument xml;
	xml.LoadFile( GetCachePath().String() );

	if ( xml.FirstChildElement("feed") )
		return true;
	return false;
}

// ----------------------------------------------------------------------------

// ensure the feed XML is available at the cache path.
// if necessary, download it.
void
Feed::EnsureCached ( )
{
	if ( IsRemote()  &&  fetched == false )
		FetchRemoteFeed();
}

// Return the 'cachePath' (location of XML file locally)
BString
Feed::GetCachePath ( )
{
	if ( cachePath == NULL )
		SetCachePath( inputPath );
	return cachePath;
}

// Select a 'cachePath' (location of XML file locally)
// For remote files, a cache file is created in ~/config/cache/Pogger/ by default
// For local files, the same local file is used.
BString
Feed::SetCachePath ( BString givenPath )
{
	BUrl givenUrl = BUrl( givenPath );
	BString protocol = givenUrl.Protocol().String();

	if ( protocol == NULL && givenUrl.UrlString() != NULL ) {
		cachePath = givenPath;
		return givenPath;
	}

	BString splitName = givenUrl.Host( );
	splitName.Append( givenUrl.Path() );
	splitName.ReplaceAll("/", "_");

	BString filename = ((App*)be_app)->cfg->cacheDir;
	filename.Append(splitName);

	cachePath = filename;
	return filename;
}

// ----------------------------------------------------------------------------

// count the amount of siblings to an element of given type name
int
Feed::xmlCountSiblings ( tinyxml2::XMLElement* xsibling, const char* sibling_name )
{
	int count = 0;
	while ( xsibling ) {
		count++;
		xsibling = xsibling->NextSiblingElement(sibling_name);
	}
	return count;
}

// ----------------------------------------------------------------------------

// add the given entry to the feed, if appropriate
bool
Feed::AddEntry ( Entry* newEntry )
{
	Config* cfg = ((App*)be_app)->cfg;
	if ( !withinDateRange( cfg->minDate, newEntry->date, cfg->maxDate ) ||
	     !withinDateRange( minDate, newEntry->date, maxDate ) )
		return false;

	if ( cfg->verbose == true )
		printf( "\t%s\n", newEntry->title.String() );
	entries.AddItem( newEntry );
	return true;
}
BList Feed::GetEntries ( ) { return entries; }

bool Feed::SetTitle ( const char* titleStr ) {
	if ( titleStr != NULL )	title = BString( titleStr );
	else return false;
	return true;
}
bool Feed::SetTitle ( tinyxml2::XMLElement* elem ) {
	if ( elem != NULL )	return SetTitle( elem->GetText() );
	else return false;
}
BString Feed::GetTitle ( ) { return title; }

bool Feed::SetDesc ( const char* descStr ) {
	if ( descStr != NULL )	description = BString( descStr );
	else return false;
	return true;
}
bool Feed::SetDesc ( tinyxml2::XMLElement* elem ) {
	if ( elem != NULL )	return SetDesc( elem->GetText() );
	else return false;
}
BString Feed::GetDesc ( ) { return description; }

// set a feed's «home URL»
bool Feed::SetHomeUrl ( const char* homepageStr ) {
	if ( homepageStr != NULL ) homeUrl = BString( homepageStr );
	else return false;
	return true;
}
bool Feed::SetHomeUrl ( tinyxml2::XMLElement* elem ) {
	if ( elem != NULL )	return SetHomeUrl( elem->GetText() );
	else return false;
}
BString Feed::GetHomeUrl ( ) { return homeUrl; }

// set the update time for a feed
bool Feed::SetDate ( const char* dateCStr ) {
	if ( dateCStr == NULL )
		return false;
	BDateTime newDate = feedDateToBDate( dateCStr );
	if ( newDate == NULL )
		return false;
	date = newDate;
	return true;
}
bool Feed::SetDate ( tinyxml2::XMLElement* elem ) {
	if ( elem != NULL )	return SetDate( elem->GetText() );
	else return false;
}
BDateTime Feed::GetDate ( ) { return date; }