/** @file
	Parser: Value class.

	Copyright (c) 2001-2012 Art. Lebedev Studio (http://www.artlebedev.com)
	Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
*/

#include "pa_value.h"
#include "pa_vstateless_class.h"
#include "pa_vmethod_frame.h"
#include "pa_vdate.h"
#include "pa_vobject.h"

volatile const char * IDENT_PA_VALUE_C="$Id: pa_value.C,v 1.35 2012/05/28 19:47:52 moko Exp $" IDENT_PA_VALUE_H IDENT_PA_PROPERTY_H;

// globals

const String name_name(NAME_NAME);

const String value_name(VALUE_NAME);
const String expires_name(EXPIRES_NAME);
const String content_type_name(CONTENT_TYPE_NAME);

// methods

Junction* Value::get_junction() { return 0; }

Value* Value::get_element(const String& /*aname*/) {
	return bark("is '%s', it has no elements");
}

VFile* Value::as_vfile(String::Language /*lang*/, const Request_charsets* /*charsets*/) { 
	bark("is '%s', it does not have file value"); return 0;
}

const String* Value::get_json_string(Json_options& options) {
	if(HashStringValue* hash=get_hash())
		return options.hash_json_string(*hash);

	if(!options.skip_unknown)
		throw Exception(PARSER_RUNTIME, 0, "Unsupported value's type (%s)", type());

	return new String("null");
}

/// call this before invoking to ensure proper actual numbered params count
void Method::check_actual_numbered_params(Value& self, 
					MethodParams* actual_numbered_params) const {
	int actual_count=actual_numbered_params?actual_numbered_params->count():0;
	if(actual_count<min_numbered_params_count || actual_count>max_numbered_params_count)
		throw Exception(PARSER_RUNTIME,
			0,
			"native method of %s (%s) accepts %s %d parameter(s) (%d present)", 
				self.get_class()->name_cstr(),
				self.type(),
				actual_count<min_numbered_params_count ? "minimum" : "maximum",
				actual_count<min_numbered_params_count ? min_numbered_params_count : max_numbered_params_count,
				actual_count);
}

// attributed meaning

static String::C date_attribute(const VDate& vdate) {
	time_t when=vdate.get_time();
	struct tm *tms=gmtime(&when);
	if(!tms)
		throw Exception(DATE_RANGE_EXCEPTION_TYPE,
			0,
			"bad time in attribute value (seconds from epoch=%u)", when);
	return date_gmt_string(tms);
}

static void append_attribute_meaning(String& result,
					Value& value, String::Language lang, bool forced) {
	if(const String* string=value.get_string())
		result.append(*string, lang, forced);
	else
		if(Value* vdate=value.as(VDATE_TYPE)) {
			String::C attribute=date_attribute(static_cast<VDate&>(*vdate));

			result.append_help_length(attribute.str, attribute.length, String::L_CLEAN);
		} else
			throw Exception(PARSER_RUNTIME,
				&result,
				"trying to append here neither string nor date (%s)",
					value.type());
}
#ifndef DOXYGEN
struct Attributed_meaning_info {
	String* header;        // header line being constructed
	String::Language lang; // language in which to append to that line
	bool forced;           // do they force that lang?
	bool allow_bool;       // allow bool types during print attributes
};
#endif
static void append_attribute_subattribute(HashStringValue::key_type akey, 
					HashStringValue::value_type avalue, 
					Attributed_meaning_info *info) {
	if(akey==VALUE_NAME)
		return;

	if(avalue->is_bool() && (!info->allow_bool || avalue->as_bool()==false))
		return;

	// ...; charset=windows1251
	*info->header << "; ";
	info->header->append(String(akey, String::L_TAINTED), info->lang, info->forced);
	if(!avalue->is_bool()) {
		if( akey==content_disposition_filename_name ) {
			*info->header << "=\"";
			append_attribute_meaning(*info->header, *avalue, info->lang, info->forced);
			*info->header << "\"";
		} else {
			*info->header << "=";
			append_attribute_meaning(*info->header, *avalue, info->lang, info->forced);
		}
	}
}
const String& attributed_meaning_to_string(Value& meaning, 
					String::Language lang, bool forced, bool allow_bool) {
	String& result=*new String;
	if(HashStringValue *hash=meaning.get_hash()) {
		// $value(value) $subattribute(subattribute value)
		if(Value* value=hash->get(value_name))
			append_attribute_meaning(result, *value, lang, forced);

		Attributed_meaning_info attributed_meaning_info={&result, lang, false, allow_bool};
		hash->for_each<Attributed_meaning_info*>(append_attribute_subattribute, &attributed_meaning_info);
	} else // result value
		append_attribute_meaning(result, meaning, lang, forced);

	return result;
}
