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/** @file
	Parser: globals.

	Copyright (c) 2001-2003 ArtLebedev Group (http://www.artlebedev.com)
	Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
*/

static const char* IDENT_GLOBALS_C="$Date: 2003/02/14 16:52:21 $";

#include "pa_config_includes.h"

#ifdef XML
#include "libxslt/extensions.h"
#include "libxslt/xsltutils.h"
extern "C" {
#include "libexslt/exslt.h"
};
#endif

#include "pa_globals.h"
#include "pa_string.h"
#include "pa_sapi.h"
#include "pa_threads.h"

#ifdef XML
#include "pa_stylesheet_manager.h"
#endif

short hex_value[0x100];

#ifdef XML
GdomeDOMImplementation *domimpl;
#endif

static void setup_hex_value() {
	memset(hex_value, 0, sizeof(hex_value));
	hex_value['0'] = 0;	
	hex_value['1'] = 1;	
	hex_value['2'] = 2;	
	hex_value['3'] = 3;	
	hex_value['4'] = 4;	
	hex_value['5'] = 5;	
	hex_value['6'] = 6;	
	hex_value['7'] = 7;	
	hex_value['8'] = 8;	
	hex_value['9'] = 9;
	hex_value['A'] = 10;
	hex_value['B'] = 11;
	hex_value['C'] = 12;
	hex_value['D'] = 13;
	hex_value['E'] = 14;
	hex_value['F'] = 15;
	hex_value['a'] = 10;
	hex_value['b'] = 11;
	hex_value['c'] = 12;
	hex_value['d'] = 13;
	hex_value['e'] = 14;
	hex_value['f'] = 15;
}

#ifdef XML

const int MAX_CONCURRENT_XML_GENERIC_ERROR_THREADS=10;

struct XML_Generic_error_info {
	pa_thread_t thread_id;
	char *message;
} xml_generic_error_infos[MAX_CONCURRENT_XML_GENERIC_ERROR_THREADS];

XML_Generic_error_info *xml_generic_error_info(pa_thread_t thread_id) {
	for(int i=0; i<MAX_CONCURRENT_XML_GENERIC_ERROR_THREADS; i++) {
		XML_Generic_error_info *p=xml_generic_error_infos+i;
		if(p->thread_id==thread_id)
			return p;
	}
	return 0;
}

static void
xmlParserGenericErrorFunc(void *ctx, const char* msg, ...) { 
    pa_thread_t thread_id=pa_get_thread_id();

	// infinitely looking for free slot to fill it
	while(true) {
		SYNCHRONIZED;  // find+fill blocked

		// first try to get existing for this thread_id
		XML_Generic_error_info *p=xml_generic_error_info(thread_id);
		if(!p) { // occupy empty one
			p=xml_generic_error_info(0);
			if(!p) // wait for empty for it to appear
				continue;
		}

		p->thread_id=thread_id;
		size_t offset=p->message?strlen(p->message):0;
		p->message=(char *)realloc(p->message, offset+MAX_STRING);
		if(!p->message)
			SAPI::die(
				"out of memory in 'xmlParserGenericErrorFunc', failed to reallocate to %u bytes", 
				offset+MAX_STRING);
		
		va_list args;
		va_start(args, msg);
		vsnprintf(p->message+offset, MAX_STRING, msg, args);
		va_end(args);

		break;
	}
}

bool xmlHaveGenericErrors() {
    pa_thread_t thread_id=pa_get_thread_id();

	SYNCHRONIZED;  // find blocked

	return xml_generic_error_info(thread_id)!=0;
}

const char* xmlGenericErrors() {
    pa_thread_t thread_id=pa_get_thread_id();

	SYNCHRONIZED;  // find+free blocked

	XML_Generic_error_info *p=xml_generic_error_info(thread_id);
	if(!p) // no errors for our thread_id registered
		return 0;

	const char* result=p->message;

	// free slot up 
	memset(p, 0, sizeof(*p));

	// it is up to caller to free it
	return result;
}

/**
 * xmlFileMatchWithLocalhostEqDocumentRoot:
 * filename:  the URI for matching
 *
 * check if the URI matches an HTTP one
 *
 * Returns 1 if matches, 0 otherwise
 */
static int
xmlFileMatchLocalhost(const char* filename) {
    if (!strncmp(filename, "http://localhost", 16))
	return(1);
    return(0);
}


/**
 * xmlFileOpenHttpLocalhost :
 * filename:  the URI for matching
 *
 * http://localhost/abc -> $ENV{DOCUMENT_ROOT}/abc | ./abc
 *
 * input from FILE *, supports compressed input
 * if filename is " " then the standard input is used
 *
 * Returns an I/O context or NULL in case of error
 */
static void *
xmlFileOpenLocalhost (const char* filename) {
    FILE *fd;
    const char* documentRoot;
    char path[1000];

	path[0]=0;
	strcat(path, (documentRoot=getenv("DOCUMENT_ROOT"))?documentRoot:".");
	strcat(path, &filename[16]);

#ifdef WIN32
    fd = fopen(path, "rb");
#else
    fd = fopen(path, "r");
#endif /* WIN32 */
    return((void *) fd);
}

/**
 * xmlFileRead:
 * @context:  the I/O context
 * @buffer:  where to drop data
 * @len:  number of bytes to write
 *
 * Read @len bytes to @buffer from the I/O channel.
 *
 * Returns the number of bytes written
 */
static int
pa_xmlFileRead (void * context, char * buffer, int len) {
    return(fread(&buffer[0], 1,  len, (FILE *) context));
}

/**
 * xmlFileClose:
 * @context:  the I/O context
 *
 * Close an I/O channel
 */
static int
pa_xmlFileClose (void * context) {
    return ( ( fclose((FILE *) context) == EOF ) ? -1 : 0 );
}

#endif

void pa_globals_destroy(void *) {
	try {
#ifdef XML
		GdomeException exc;
		gdome_di_unref (domimpl, &exc);
#endif
	} catch(const Exception& e) {
		SAPI::die("pa_globals_destroy failed: %s", e.comment());
	}
}


/// @test hint on one should call this for each thread xmlSubstituteEntitiesDefault(1);
void pa_globals_init() {

	// hex value
	setup_hex_value();

#ifdef XML
	// initializing xml libs

	/* First I get a DOMImplementation reference */
	domimpl = gdome_di_mkref ();
    /*
     * Register the EXSLT extensions and the test module
     */
    exsltRegisterAll();
    xsltRegisterTestModule();
    xmlDefaultSAXHandlerInit();
    /*
     * disable CDATA from being built in the document tree
     */
    // never added yet  xmlDefaultSAXHandler.cdataBlock = NULL;

	/*
	 * Initialization function for the XML parser.
	 * This is not reentrant. Call once before processing in case of
	 * use in multithreaded programs.
	*/
	xmlInitParser();

	// 1. this is needed for proper parsing of stylesheets
	// there were a situation where honest entity ruined innocent xpath compilation
	// doc says "you sould turn it on on stylesheet load" without deepening into details
	// 2. when dom tree with entites goes under transform text nodes 
	// got [erroreosly] cut on first entity occurance
	// --
	// that is why this is:
	xmlSubstituteEntitiesDefault(1);
	
	// Bit in the loadsubset context field to tell to do ID/REFs lookups 
	xmlLoadExtDtdDefaultValue |= XML_DETECT_IDS;
	// Bit in the loadsubset context field to tell to do complete the elements attributes lists 
	// with the ones defaulted from the DTDs 
    xmlLoadExtDtdDefaultValue |= XML_COMPLETE_ATTRS;

	// validate each document after load/create (?)
	//xmlDoValidityCheckingDefaultValue = 1;

//regretfully this not only replaces entities on parse, but also on generate	xmlSubstituteEntitiesDefault(1);
	// never switched this on xmlIndentTreeOutput=1;

	memset(xml_generic_error_infos, 0, sizeof(xml_generic_error_infos));
	xmlSetGenericErrorFunc(0, xmlParserGenericErrorFunc);
	xsltSetGenericErrorFunc(0, xmlParserGenericErrorFunc);
//	FILE *f=fopen("y:\\xslt.log", "wt");
//	xsltSetGenericDebugFunc(f/*stderr*/, 0);

	// http://localhost/abc -> $ENV{DOCUMENT_ROOT}/abc | ./abc
	xmlRegisterInputCallbacks(
		xmlFileMatchLocalhost, xmlFileOpenLocalhost,
		pa_xmlFileRead, pa_xmlFileClose);

	// XSLT stylesheet manager
	cache_managers->put(*NEW String(pool, "stylesheet"), 
		stylesheet_manager=NEW Stylesheet_manager(pool));
#endif
}

#if defined(XML) && defined(_MSC_VER)
#	define GNOME_LIBS "/parser3project/win32xml/win32/gnome"
#	pragma comment(lib, GNOME_LIBS "/glib/lib/libglib-1.3-11.lib")
#	ifdef _DEBUG
#		pragma comment(lib, GNOME_LIBS "/libxml2-x.x.x/win32/dsp/libxml2_so_debug/libxml2.lib")
#		pragma comment(lib, GNOME_LIBS "/libxslt-x.x.x/win32/dsp/libexslt_so_debug/libexslt.lib")
#		pragma comment(lib, GNOME_LIBS "/libxslt-x.x.x/win32/dsp/libxslt_so_debug/libxslt.lib")
#		pragma comment(lib, GNOME_LIBS "/gdome2-x.x.x/win32/dsp/Debug/libgdome.lib")
#	else
#		pragma comment(lib, GNOME_LIBS "/libxml2-x.x.x/win32/dsp/libxml2_so_release/libxml2.lib")
#		pragma comment(lib, GNOME_LIBS "/libxslt-x.x.x/win32/dsp/libexslt_so_release/libexslt.lib")
#		pragma comment(lib, GNOME_LIBS "/libxslt-x.x.x/win32/dsp/libxslt_so_release/libxslt.lib")
#		pragma comment(lib, GNOME_LIBS "/gdome2-x.x.x/win32/dsp/Release/libgdome.lib")
#	endif
#endif