/** @file
	Parser: @b string parser class.

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

static const char* IDENT_STRING_C="$Date: 2003/02/14 12:59:09 $";

#include "classes.h"
#include "pa_vmethod_frame.h"

#include "pa_request.h"
#include "pa_vdouble.h"
#include "pa_vint.h"
#include "pa_vtable.h"
#include "pa_vbool.h"
#include "pa_string.h"
#include "pa_sql_connection.h"
#include "pa_dictionary.h"
#include "pa_vmethod_frame.h"

// class

class MString : public Methoded {
public:
	MString();
public: // Methoded
	bool used_directly() { return true; }
};


// global variable

MethodedPtr string_class(new MString);

// methods

static void _length(Request& r, StringPtr method_name, MethodParams& ) {
	Pool& pool=r.pool();
	double result=GET_SELF(r, VString).string()->size();
	r.write_no_lang(ValuePtr(new VDouble(result)));
}

static void _int(Request& r, StringPtr method_name, MethodParams& params) {
	Pool& pool=r.pool();
	StringPtr self_string=r.get_self()->get_string(&pool);
	int converted;
	ValuePtr default_code=params.count()>0?params.as_junction(0, "default must be int")
		:ValuePtr(0); // (default)
	try {
		if(!self_string || self_string->is_empty())
			throw Exception("parser.runtime",
				method_name,
				"parameter is empty string, error converting");
		converted=self_string->as_int();
	} catch(...) { // convert problem
		if(!default_code) // we have a problem when no default
			rethrow;
		else
			converted=r.process_to_value(default_code)->as_int();
	}
	r.write_no_lang(ValuePtr(new VInt(converted)));
}

static void _double(Request& r, StringPtr method_name, MethodParams& params) {
	Pool& pool=r.pool();
	StringPtr self_string=GET_SELF(r, VString).string();
	double converted;
	ValuePtr default_code=params.count()>0?params.as_junction(0, "default must be double")
		:ValuePtr(0); // (default)
	try {
		if(!self_string || self_string->is_empty())
			throw Exception("parser.runtime",
				method_name,
				"parameter is empty string, error converting");
		converted=self_string->as_double();
	} catch(...) { // convert problem
		if(!default_code) // we have a problem when no default
			rethrow;  
		else
			converted=r.process_to_value(default_code)->as_double();
	}

	r.write_no_lang(ValuePtr(new VDouble(converted)));
}

/*not static*/void _string_format(Request& r, StringPtr method_name, MethodParams& params) {
	Pool& pool=r.pool();

	ValuePtr fmt_maybe_code=params[0];
	// for some time due to stupid {} in original design
	StringPtr fmt=r.process_to_string(fmt_maybe_code);

	const char *buf=format(pool, r.get_self()->as_double(), fmt->cstr());

	String result;
	result.APPEND_CLEAN(buf, 0, 
		method_name->origin().file,
		method_name->origin().line);
	r.write_no_lang(result);
}

static void _left(Request& r, StringPtr /*method_name*/, MethodParams& params) {
	size_t n=(size_t)params.as_int(0, "n must be int", r);
	
	StringPtr string=GET_SELF(r, VString).string();
	r.write_assign_lang(*string->mid(0, n));
}

static void _right(Request& r, StringPtr /*method_name*/, MethodParams& params) {
	size_t n=(size_t)params.as_int(0, "n must be int", r);
	
	StringPtr string=GET_SELF(r, VString).string();
	r.write_assign_lang(*string->mid(string->size()-n, string->size()));
}

static void _mid(Request& r, StringPtr /*method_name*/, MethodParams& params) {
	StringPtr string=GET_SELF(r, VString).string();

	size_t p=(size_t)max(0, params.as_int(0, "p must be int", r));
	size_t n=params.count()>1?
		(size_t)max(0, params.as_int(1, "n must be int", r)):string->size();
	
	r.write_assign_lang(*string->mid(p, p+n));
}

static void _pos(Request& r, StringPtr method_name, MethodParams& params) {
	Pool& pool=r.pool();
	ValuePtr substr=params.as_no_junction(0, "substr must not be code");
	
	StringPtr string=GET_SELF(r, VString).string();
	r.write_assign_lang(ValuePtr(new VInt(string->pos(*substr->as_string(&pool)))));
}

static void split_list(Request& r, StringPtr method_name, 
					   MethodParams& params, int paramIndex,
					   String& string, 
					   ArrayString& result) {
	Pool& pool=r.pool();
	ValuePtr delim_value=params.as_no_junction(paramIndex, "delimiter must not be code");

	string.split(result, 0, *delim_value->as_string(&pool));
}

#define SPLIT_LEFT 0x0001
#define SPLIT_RIGHT 0x0010
#define SPLIT_HORIZONTAL 0x0100
#define SPLIT_VERTICAL 0x1000

static int split_options(StringPtr options) {
    struct Split_option {
		const char* keyL;
		const char* keyU;
		int setBit;
		int checkBit;
    } split_option[]={
		{"l", "L", SPLIT_LEFT, SPLIT_RIGHT}, // 0xVHRL
		{"r", "R", SPLIT_RIGHT, SPLIT_LEFT},
		{"h", "H", SPLIT_HORIZONTAL, SPLIT_VERTICAL},
		{"v", "V", SPLIT_VERTICAL, SPLIT_HORIZONTAL},
		{0}
    };

	int result=0;
    if(options) {
		for(Split_option *o=split_option; o->keyL; o++) 
			if(options->pos(o->keyL)>=0
				|| (o->keyU && options->pos(o->keyU)>=0)) {
				if(result & o->checkBit)
					throw Exception("parser.runtime",
						options,
						"conflicting split options");
				result |= o->setBit;
			}
	}

	return result;
}

static TablePtr split_vertical(Request& r, StringPtr string, ArrayString& pieces, bool right) {
	Pool& pool=r.pool();

	Table::columns_type columns(new ArrayString);
	*columns+=StringPtr(new String("piece"));

	TablePtr table(new Table(string, columns, pieces.count()));
	if(right) { // right
		for(int i=pieces.count(); --i>=0; ) {
			Table::element_type row(new ArrayString);
			*row+=pieces[i];
			*table+=row;
		}
	} else { // left
		Array_iterator<StringPtr> i(pieces);
		while(i.has_next()) {
			Table::element_type row(new ArrayString);
			*row+=i.next();
			*table+=row;
		}
	}

	return table;
}

static TablePtr split_horizontal(Request& r, StringPtr string, ArrayString& pieces, bool right) {
	Pool& pool=r.pool();

	TablePtr table(new Table(string, Table::columns_type(0) /* nameless */));
	Table::element_type row(new ArrayString(pieces.count()));
	if(right) { // right
		for(int i=pieces.count(); --i>=0; ) {
			*row+=pieces[i];
		}
	} else { // left
		Array_iterator<StringPtr> i(pieces);
		while(i.has_next()) {
			*row+=i.next();
		}
	}
	*table+=row;

	return table;
}

static void split_with_options(Request& r, StringPtr method_name, MethodParams& params,
							   int bits) {
	Pool& pool=r.pool();
	StringPtr string=GET_SELF(r, VString).string();

	ArrayString pieces;
	split_list(r, method_name, params, 0, *string, pieces);

	if(!bits) {
		StringPtr options(0);
		if(params.count()>1) {
			options=params.as_string(1, "options must not be code");
		}
		bits=split_options(options);
	}

	bool right=(bits & SPLIT_RIGHT) != 0;
	bool horizontal=(bits & SPLIT_HORIZONTAL) !=0;
	TablePtr table=horizontal?split_horizontal(r, string, pieces, right)
		:split_vertical(r, string, pieces, right);

	r.write_no_lang(ValuePtr(new VTable(table)));
}
static void _split(Request& r, StringPtr method_name, MethodParams& params) {
	split_with_options(r, method_name, params, 0 /* maybe-determine from param #2 */);
}
static void _lsplit(Request& r, StringPtr method_name, MethodParams& params) {
	split_with_options(r, method_name, params, SPLIT_LEFT);
}
static void _rsplit(Request& r, StringPtr method_name, MethodParams& params) {
	split_with_options(r, method_name, params, SPLIT_RIGHT);
}

static void search_action(TablePtr table, Table::element_type row, int, int, int, int, void *) {
	if(row)
		*table+=row;
}

#ifndef DOXYGEN
struct Replace_action_info {
	Request *request;  
	StringPtr origin;
	StringPtr src;  String* dest;
	VTablePtr vtable;
	ValuePtr replacement_code;
};
#endif
/// @todo they can do $global[$result] there, getting pointer to later-invalid local var, kill this
static void replace_action(TablePtr table, ArrayStringPtr row, 
						   int prestart, int prefinish, 
						   int poststart, int postfinish,
						   void *info) {
	Replace_action_info& ai=*static_cast<Replace_action_info *>(info);
	if(row) { // begin&middle
		// piece from last match['prestart'] to beginning of this match['prefinish']
		if(prestart!=prefinish)
			*ai.dest << ai.src->mid(prestart, prefinish);//ai.dest->APPEND_CONST("-");
		// store found parts in one-record VTable
		if(table->count()) // middle
			table->put(0, row);
		else // begin
			*table+=row;
		{ // execute 'replacement_code' in 'table' context
			ai.vtable->set_table(table);

			*ai.dest << ai.request->process_to_string(ai.replacement_code);
		}
	} else // end
		*ai.dest << ai.src->mid(poststart, postfinish);
}

/// @todo use pcre:study somehow
static void _match(Request& r, StringPtr method_name, MethodParams& params) {
	Pool& pool=r.pool();
	ValuePtr regexp=params.as_no_junction(0, "regexp must not be code");

	StringPtr options=
		params.count()>1?
		params.as_no_junction(1, "options must not be code")->as_string(&pool):StringPtr(0);

	Temp_lang temp_lang(r, String::UL_PASS_APPENDED);
	StringPtr src=GET_SELF(r, VString).string();
	if(params.count()<3) { // search
		bool was_global;
		TablePtr table=src->match(r.charsets.source(),
			method_name, 
			*regexp->as_string(&pool), options,
			search_action, 0,
			&was_global);
		ValuePtr result;
		// matched
		// not (just matched[3=pre/match/post], no substrings) or Global search
		if(table->columns()->count()>3 || was_global) 
			result=ValuePtr(new VTable(table/*TODO: clone this when table would be stacked!*/)); // table of pre/match/post+substrings
		else 
			result=ValuePtr(new VBool(table));
		r.write_assign_lang(result);
	} else { // replace
		ValuePtr replacement_code=params.as_junction(2, "replacement param must be code");

		String result;
		VTablePtr vtable(new VTable);
		Replace_action_info info;
		info.request=&r;
		info.origin=method_name;
		info.src=src;
		info.dest=&result;
		info.vtable=vtable;
		info.replacement_code=replacement_code;
		Temp_value_element temp_match_var(
			*replacement_code->get_junction()->method_frame, 
			match_var_name, vtable);
		src->match(r.charsets.source(),
			method_name, 
			*r.process_to_string(regexp), options,
			replace_action, &info);
		r.write_assign_lang(result);
	}
}

static void change_case(Request& r, StringPtr method_name, MethodParams& params, 
						String::Change_case_kind kind) {
	Pool& pool=r.pool();
	StringPtr src=GET_SELF(r, VString).string();

	r.write_assign_lang(*src->change_case(pool, r.charsets.source(), kind));
}
static void _upper(Request& r, StringPtr method_name, MethodParams& params) {
	change_case(r, method_name, params, String::CC_UPPER);
}
static void _lower(Request& r, StringPtr method_name, MethodParams& params) {
	change_case(r, method_name, params, String::CC_LOWER);
}

#ifndef DOXYGEN
class String_sql_event_handlers: public SQL_Driver_query_event_handlers {
	//Pool& pool;
	StringPtr statement_string; const char* statement_cstr;
	bool got_column;
public:
	bool got_cell;
	StringPtr result;
public:
	String_sql_event_handlers(//Pool& apool, 
		StringPtr astatement_string, const char* astatement_cstr):
		//pool(apool), 
		statement_string(astatement_string),
		statement_cstr(astatement_cstr),
		result(new String) {}

	bool add_column(SQL_Error& error, void *ptr, size_t size) {
		if(got_column) {
			error=SQL_Error("parser.runtime",
				//statement_string,
				"result must contain exactly one column");
			return true;
		}
		got_column=true;
		return false;
	}
	bool before_rows(SQL_Error& /*error*/ ) { /* ignore */ return false; }
	bool add_row(SQL_Error& /*error*/) { /* ignore */ return false; }
	bool add_row_cell(SQL_Error& error, void *ptr, size_t size) {
		if(got_cell) {
			error=SQL_Error("parser.runtime",
				//statement_string,
				"result must not contain more then one row");
			return true;
		}

		try {
			got_cell=true;
			result->APPEND_TAINTED((const char* )ptr, size, statement_cstr, 0);
			return false;
		} catch(...) {
			error=SQL_Error("exception occured in String_sql_event_handlers::add_row_cell");
			return true;
		}
	}
};
#endif
StringPtr sql_result_string(Request& r, StringPtr method_name, MethodParams& params,
							HashStringValue*& options, ValuePtr& default_code) {
	Pool& pool=r.pool();

	ValuePtr statement=params.as_junction(0, "statement must be code");

	ulong limit=0;
	ulong offset=0;
	default_code=ValuePtr(0);
	if(params.count()>1) {
		ValuePtr voptions=params.as_no_junction(1, "options must be hash, not code");
		if(!voptions->is_string())
			if(options=voptions->get_hash(method_name)) {
				if(ValuePtr vlimit=options->get(sql_limit_name))
					limit=(ulong)r.process_to_value(vlimit)->as_double();
				if(ValuePtr voffset=options->get(sql_offset_name))
					offset=(ulong)r.process_to_value(voffset)->as_double();
				if(default_code=options->get(sql_default_name)) {
					if(JunctionPtr default_junction=default_code->get_junction())
						;//default_junction->change_context(statement.get_junction());
					else
						throw Exception("parser.runtime",
							method_name,
							"default option must be code");
				}
			} else
				throw Exception("parser.runtime",
					method_name,
					"options must be hash");
	} else
		options=0;

	Temp_lang temp_lang(r, String::UL_SQL);
	StringPtr statement_string=r.process_to_string(statement);
	const char* statement_cstr=
		statement_string->cstr(pool, String::UL_UNSPECIFIED, r.connection(method_name));
	String_sql_event_handlers handlers(statement_string, statement_cstr);
	r.connection(method_name)->query(
		statement_cstr, offset, limit, 
		handlers,
		statement_string);
	
	if(!handlers.got_cell)
		return 0; // no lines, caller should return second param[default value]

	return handlers.result;
}

static void _sql(Request& r, StringPtr method_name, MethodParams& params) {
	Pool& pool=r.pool();

	HashStringValue* options;
	ValuePtr default_code;
	StringPtr string=sql_result_string(r, method_name, params, options, default_code);
	if(!string) {
		if(default_code) {
			string=r.process_to_string(default_code);
			if(!string)
				string=StringPtr(new String);
		} else
			throw Exception("parser.runtime",
				method_name,
				"produced no result, but no default option specified");
	}

	r.write_assign_lang(*string);
}

static void _replace(Request& r, StringPtr method_name, MethodParams& params) {
	Pool& pool=r.pool();
	StringPtr src=GET_SELF(r, VString).string();

	Table* table=params.as_no_junction(0, "parameter must not be code")->get_table();
	if(!table)
		throw Exception("parser.runtime",
			method_name,
			"parameter must be table");

	Dictionary dict2(TablePtr(table), 1/*am not sure why using the =default parameter causes compile errors in replace*/ );
	r.write_assign_lang(*src->replace(pool, dict2));
}

static void _save(Request& r, StringPtr method_name, MethodParams& params) {
	StringPtr file_name=params.as_string(params.count()-1, 
		"file name must be string");

	StringPtr src=GET_SELF(r, VString).string();

	bool do_append=false;
	if(params.count()>1) {
		StringPtr mode=params.as_string(0, "mode must be string");
		if(*mode=="append")
			do_append=true;
		else
			throw Exception("parser.runtime",
				mode,
				"unknown mode, must be 'append'");
	}		

	// write
	CharPtr buf=src->cstr(String::UL_UNSPECIFIED, r.connection(StringPtr(0)/*no error if none*/));
	file_write(r.absolute(file_name), 
		buf, strlen(buf), true, do_append);
}

static void _normalize(Request& r, StringPtr method_name, MethodParams&  /*params*/) {
	StringPtr src=GET_SELF(r, VString).string();

	r.write_assign_lang(*src->join_chains(r.pool()));
}

// constructor

MString::MString(): Methoded("string") {
	// ^string.length[]
	add_native_method("length", Method::CT_DYNAMIC, _length, 0, 0);
	
	// ^string.int[]
	// ^string.int(default)
	add_native_method("int", Method::CT_DYNAMIC, _int, 0, 1);
	// ^string.double[]
	// ^string.double(default)
	add_native_method("double", Method::CT_DYNAMIC, _double, 0, 1);

	// ^string.format{format}
	add_native_method("format", Method::CT_DYNAMIC, _string_format, 1, 1);

	// ^string.left(n)
	add_native_method("left", Method::CT_DYNAMIC, _left, 1, 1);
	// ^string.right(n)
	add_native_method("right", Method::CT_DYNAMIC, _right, 1, 1);
	// ^string.mid(p;n)
	add_native_method("mid", Method::CT_DYNAMIC, _mid, 1, 2);

	// ^string.pos[substr]
	add_native_method("pos", Method::CT_DYNAMIC, _pos, 1, 1);

	// ^string.split[delim]
	// ^string.split[delim][options]
	add_native_method("split", Method::CT_DYNAMIC, _split, 1, 2);
		// old names for backward compatibility
		// ^string.lsplit[delim]
		add_native_method("lsplit", Method::CT_DYNAMIC, _lsplit, 1, 1);
		// ^string.rsplit[delim]
		add_native_method("rsplit", Method::CT_DYNAMIC, _rsplit, 1, 1);
	
	// ^string.match[regexp][options]
	// ^string.match[regexp][options]{replacement-code}
	add_native_method("match", Method::CT_DYNAMIC, _match, 1, 3);

	// ^string.toupper[]
	add_native_method("upper", Method::CT_DYNAMIC, _upper, 0, 0);
	// ^string.tolower[]
	add_native_method("lower", Method::CT_DYNAMIC, _lower, 0, 0);

	// ^sql[query]
	// ^sql[query][$.limit(1) $.offset(2) $.default[n/a]]
	add_native_method("sql", Method::CT_STATIC, _sql, 1, 2);

	// ^string.replace[table]
	add_native_method("replace", Method::CT_DYNAMIC, _replace, 1, 1);

	// ^string.save[file]  
	add_native_method("save", Method::CT_DYNAMIC, _save, 1, 2);

	// ^string.normalize[]  
	add_native_method("normalize", Method::CT_DYNAMIC, _normalize, 0, 0);
}