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date.C

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

      Copyright (c) 2001-2005 ArtLebedev Group (http://www.artlebedev.com)
      Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
*/

static const char * const IDENT_DATE_C="$Date: 2008-09-04 09:35:09 $";

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

#include "pa_request.h"
#include "pa_vdouble.h"
#include "pa_vdate.h"
#include "pa_vtable.h"

// class

class MDate: public Methoded {
public: // VStateless_class
      Value* create_new_value(Pool&, HashStringValue&) { return new VDate(0); }

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

// global variable

DECLARE_CLASS_VAR(date, new MDate, 0);

// helpers

class Date_calendar_table_template_columns: public ArrayString {
public:
      Date_calendar_table_template_columns(): ArrayString(6+2) {
            for(int i=0; i<=6; i++) {
                  char *cname=new(PointerFreeGC) char[1/*strlen("6")*/+1/*terminating 0*/];
                  *this+=new String(cname, sprintf(cname, "%d", i)); // .i column name
            }
            *this+=new String("week");
            *this+=new String("year");
      }
};


Table date_calendar_table_template(new Date_calendar_table_template_columns);

// methods

static void _now(Request& r, MethodParams& params) {
      VDate& vdate=GET_SELF(r, VDate);

      time_t t=time(0);
      if(params.count()==1) // ^now(offset)
            t+=(time_t)round(params.as_double(0, "offset must be double", r)*SECS_PER_DAY);
      
      vdate.set_time(t);
}

/// shrinked range: 1970/1/1 to 2038/1/1
00064 static int to_year(int iyear) {
      if(iyear<1970 || iyear>2038)
            throw Exception(DATE_RANGE_EXCEPTION_TYPE,
                  0,
                  "year '%d' is out of valid range", iyear);
      return iyear;
}

static int to_month(int imonth) {
      return max(1, min(imonth, 12)) -1;
}

static int to_tm_year(int iyear) {
      return to_year(iyear)-1900;
}


// 2002-04-25 18:14:00
// 18:14:00
// 2002:04:25 [+maybe time]
/*not static, used in image.C*/ tm cstr_to_time_t(char *cstr) {
      if( !cstr || !*cstr )
            throw Exception(DATE_RANGE_EXCEPTION_TYPE,
                  0,
                  "empty string is not valid datetime");

      char *cur=cstr;
      char date_delim=isdigit((unsigned char)cur[0])&&isdigit((unsigned char)cur[1])&&isdigit((unsigned char)cur[2])&&isdigit((unsigned char)cur[3])&&cur[4]==':'?':'
            :'-';
      const char* year=lsplit(&cur, date_delim);
      const char* month=lsplit(&cur, date_delim);
      const char* mday=lsplit(&cur, ' ');
      if(!month)
            cur=cstr;
      const char* hour=lsplit(&cur, ':');
      const char* min=lsplit(&cur, ':');
      const char* sec=lsplit(&cur, '.');
      const char* msec=cur;

      tm tmIn;  memset(&tmIn, 0, sizeof(tmIn));
      tmIn.tm_isdst=-1;
      if(!month)
            if(min) {
                  year=mday=0; // HH:MM
                  time_t t=time(0);
                  tm *tmNow=localtime(&t);
                  tmIn.tm_year=tmNow->tm_year;
                  tmIn.tm_mon=tmNow->tm_mon;
                  tmIn.tm_mday=tmNow->tm_mday;
                  goto date_part_set;
            } else
                  hour=min=sec=msec=0; // not YYYY- & not HH: = just YYYY                             
      tmIn.tm_year=to_tm_year(pa_atoi(year));
      tmIn.tm_mon=month?pa_atoi(month)-1:0;
      tmIn.tm_mday=mday?pa_atoi(mday):1;
date_part_set:
      tmIn.tm_hour=hour?pa_atoi(hour):0;
      tmIn.tm_min=min?pa_atoi(min):0;
      tmIn.tm_sec=sec?pa_atoi(sec):0;     
      //tmIn.tm_[msec<<no such, waits reimplementation of the class]=f(msec);
      return tmIn;
}

static void _create(Request& r, MethodParams& params) {
      VDate& vdate=GET_SELF(r, VDate);

      if(params.count()==1){
            if(const String* sdate=params[0].get_string()){ // ^create[2002-04-25 18:14:00] ^create[18:14:00]
                  vdate.set_time(cstr_to_time_t(sdate->cstrm()));
            } else { // ^create(float days) or ^create[date object]
                  time_t t=(time_t)round(params.as_double(0, "float days must be double", r)*SECS_PER_DAY);
                  if(t<0 || !localtime(&t))
                        throw Exception(DATE_RANGE_EXCEPTION_TYPE,
                              0,
                              "invalid datetime");
                  vdate.set_time(t);
            }
      } else { // ^create(y;m;d[;h[;m[;s]]])
            assert(params.count()<=6);
            tm tmIn; memset(&tmIn, 0, sizeof(tmIn));
            tmIn.tm_isdst=-1;
            tmIn.tm_year=to_tm_year(params.as_int(0, "year must be int", r));
            tmIn.tm_mon=params.as_int(1, "month must be int", r)-1;
            tmIn.tm_mday=params.count()>2?params.as_int(2, "mday must be int", r):1;
            int savedHour=0;
            if(params.count()>3) savedHour=tmIn.tm_hour=params.as_int(3, "hour must be int", r);
            if(params.count()>4) tmIn.tm_min=params.as_int(4, "minutes must be int", r);
            if(params.count()>5) tmIn.tm_sec=params.as_int(5, "seconds must be int", r);
            vdate.set_time(tmIn);
      };
}

static void _sql_string(Request& r, MethodParams&) {
      VDate& vdate=GET_SELF(r, VDate);
      int size=1+ 4+1+2+1+2 +1+ 2+1+2+1+2 +1 +1;
      char *buf=new(PointerFreeGC) char[size];
      size=strftime(buf, size, "%Y-%m-%d %H:%M:%S", &vdate.get_localtime());
      
      r.write_assign_lang(String(buf, size));
}

static void _gmt_string(Request& r, MethodParams&) {
      VDate& vdate=GET_SELF(r, VDate);

      time_t when=vdate.get_time();
      
      r.write_assign_lang(String(date_gmt_string(gmtime(&when))));
}

static void _roll(Request& r, MethodParams& params) {
      VDate& vdate=GET_SELF(r, VDate);

      const String& what=params.as_string(0, "'what' must be string");
      int oyear=0;
      int omonth=0;
      int oday=0;
      int *offset;
      if(what=="year") offset=&oyear;
      else if(what=="month") offset=&omonth;
      else if(what=="day") offset=&oday;
      else if(what=="TZ") {
            const String& argument_tz=params.as_string(1, "'TZ' must be string");
            vdate.set_tz(&argument_tz);
            return;
      } else
            throw Exception(PARSER_RUNTIME,
                  &what,
                  "must be year|month|day|TZ");
      
      *offset=params.as_int(1, "offset must be int", r);

      time_t self_time=vdate.get_time();
      tm tmIn=*localtime(&self_time);
      tm tmSaved=tmIn;
      int adjust_day=0;
      time_t t_changed_date;
      while(true) {
            tmIn.tm_year+=oyear;
            tmIn.tm_mon+=omonth;
            tmIn.tm_mday+=oday+adjust_day;
            tmIn.tm_hour=24/2; 
            tmIn.tm_min=0;
            tmIn.tm_sec=0;
            int saved_mon=(tmIn.tm_mon+12*100)%12; // crossing year boundary backwards
            t_changed_date=mktime/*normalizetime*/(&tmIn);
            if(t_changed_date<0)
                  throw Exception(DATE_RANGE_EXCEPTION_TYPE,
                        0,
                        "bad resulting time (rolled out of valid date range)");
            if(oday==0 && tmIn.tm_mon!=saved_mon/*but it changed*/) {
                  if(adjust_day <= -3/*31->28 max, so never, but...*/)
                        throw Exception(DATE_RANGE_EXCEPTION_TYPE,
                              0,
                              "bad resulting time (day hole still with %d day adjustment)", adjust_day );
                  
                  tmIn=tmSaved; // restoring
                  --adjust_day; //retrying with prev day
            } else
                  break;                  
      }

      tm *tmOut=localtime(&t_changed_date);
      if(!tmOut)
            throw Exception(DATE_RANGE_EXCEPTION_TYPE,
                  0,
                  "bad resulting time (seconds from epoch=%d)", t_changed_date);
    
      tmOut->tm_hour=tmSaved.tm_hour;
      tmOut->tm_min=tmSaved.tm_min;
      tmOut->tm_sec=tmSaved.tm_sec;
      tmOut->tm_isdst=-1; 
      {
            time_t t_changed_time=mktime/*normalizetime*/(tmOut);
            /*autofix: in msk timezone last sunday of march hour hole: [2am->3am)
            if(
                  tmOut->tm_hour!=tmSaved.tm_hour
                  ||tmOut->tm_min!=tmSaved.tm_min)
                  throw Exception(0,
                        0,
                        "bad resulting time (hour hole)");
            */

            if(t_changed_time<0)
                  throw Exception(DATE_RANGE_EXCEPTION_TYPE,
                        0,
                        "bad resulting time (after reconstruction)");
            
            vdate.set_time(t_changed_time);
      }
}

static Table& fill_month_days(Request& r, MethodParams& params, bool rus){
      Table::Action_options table_options;
      Table& result=*new Table(date_calendar_table_template, table_options);
      
      int year=to_year(params.as_int(1, "year must be int", r));
      int month=to_month(params.as_int(2, "month must be int", r));
      
      tm tmIn;  
      memset(&tmIn, 0, sizeof(tmIn)); 
      tmIn.tm_mday=1;
      tmIn.tm_mon=month; 
      tmIn.tm_year=year-1900;

      time_t t=mktime(&tmIn);
      if(t<0)
            throw Exception(DATE_RANGE_EXCEPTION_TYPE, 
                  0, 
                  "invalid date");
      tm *tmOut=localtime(&t);
      
      int weekDay1=tmOut->tm_wday;
      if(rus) 
            weekDay1=weekDay1?weekDay1-1:6; //sunday last
      int monthDays=getMonthDays(year, month);
      
      for(int _day=1-weekDay1; _day<=monthDays;) {
            Table::element_type row(new ArrayString(7));
            // calculating year week no [1..54]
            char *weekno_buf=0; // surely would be assigned to, but to calm down compiler
            size_t weekno_size=0; // same
            int weekyear=0; // same
            // 0..6 week days-cells fill with month days
            for(int wday=0; wday<7; wday++, _day++) {
                  String* cell=new String;
                  if(_day>=1 && _day<=monthDays) {
                        char *buf=new(PointerFreeGC) char[2+1]; 
                        cell->append_know_length(buf, sprintf(buf, "%02d", _day), String::L_CLEAN);
                  }
                  *row+=cell;            

                  if(wday==(rus?3:4)/*thursday*/) {
                        tm tms;
                        memset(&tms, 0, sizeof(tmIn)); 
                        tms.tm_mday=_day;
                        tms.tm_mon=month; 
                        tms.tm_year=year-1900;
                        
                        /*normalize*/mktime(&tms);
                        weekyear=tms.tm_year+1900;

                        const int weekno_buf_size=2+1/*for stupid snprintfs*/ +1;

                        weekno_buf=new(PointerFreeGC) char[weekno_buf_size];
                        VDate::yw week = VDate::CalcWeek(tms);
                        weekno_size=snprintf(weekno_buf, weekno_buf_size, "%02d", week.week);
                  }
            
        }
            // appending year week no
            *row+=new String(weekno_buf, weekno_size);
            // appending year week year
            {
                  char* buf=new(PointerFreeGC) char[4+1]; 
                  *row+=new String(buf, sprintf(buf, "%02d", weekyear));
            }
            result+=row;
      }
      
      return result;
}

static Table& fill_week_days(Request& r, MethodParams& params, bool rus){
      Table::columns_type columns(new ArrayString(4));
      *columns+=new String("year");
      *columns+=new String("month");
      *columns+=new String("day");
      *columns+=new String("weekday");
      Table& result=*new Table(columns);

      int year=to_year(params.as_int(1, "year must be int", r));
      int month=to_month(params.as_int(2, "month must be int", r));
      int day=params.as_int(3, "day must be int", r);
      
      tm tmIn;
      memset(&tmIn, 0, sizeof(tmIn)); 
      tmIn.tm_hour=18;
      tmIn.tm_mday=day;
      tmIn.tm_mon=month; 
      tmIn.tm_year=year-1900;
            
      time_t t=mktime(&tmIn);
      if(t<0)
            throw Exception(DATE_RANGE_EXCEPTION_TYPE, 
                  0, 
                  "invalid date");
      tm *tmOut=localtime(&t);
    
      int baseWeekDay=tmOut->tm_wday;
      if(rus) 
            baseWeekDay=baseWeekDay?baseWeekDay-1:6; //sunday last
      
      t-=baseWeekDay*SECS_PER_DAY;
            
      for(int curWeekDay=0; curWeekDay<7; curWeekDay++, t+=SECS_PER_DAY) {
            tm *tmOut=localtime(&t);
            Table::element_type row(new ArrayString(4));
#define WDFILL(size, value) { \
                  char *buf=new(PointerFreeGC) char[size+1]; \
                  *row+=new String(buf, sprintf(buf, "%0"#size"d", value)); \
            }
            WDFILL(4, 1900+tmOut->tm_year);
            WDFILL(2, 1+tmOut->tm_mon);
            WDFILL(2, tmOut->tm_mday);
            WDFILL(2, tmOut->tm_wday);
            result+=row;
      }
      
      return result;
}

static void _calendar(Request& r, MethodParams& params) {
      const String& what=params.as_string(0, "format must be strig");
      bool rus=false;
      if(what=="rus")
            rus=true;
      else if(what=="eng")
            rus=false;
      else
            throw Exception(PARSER_RUNTIME, 
                  &what, 
                  "must be rus|eng");

      Table* table;
      if(params.count()==1+2) 
            table=&fill_month_days(r, params, rus);
      else // 1+3
            table=&fill_week_days(r, params, rus);

      r.write_no_lang(*new VTable(table));
}

static void _unix_timestamp(Request& r, MethodParams& params) {
      VDate& vdate=GET_SELF(r, VDate);

      if(params.count()==0) { 
            // ^date.unix-timestamp[]
            r.write_no_lang(*new VInt((int)vdate.get_time()));
      } else {
            if(vdate.get_time())
                  throw Exception(PARSER_RUNTIME,
                        0,
                        "date object already constructed");

            // ^unix-timestamp(time_t)
            time_t t=(time_t)params.as_int(0, "Unix timestamp must be integer", r);

            vdate.set_time(t);
      }
}

static void _last_day(Request& r, MethodParams& params) {
      int year;
      int month;
      if(&r.get_self() == date_class) {
            if(params.count() != 2)
                  throw Exception(PARSER_RUNTIME,
                        0,
                        "year and month must be defined");

            // ^date:lastday(year;month)
            year=to_year(params.as_int(0, "year must be int", r));
            month=to_month(params.as_int(1, "month must be int", r));
      } else {
            // ^date.lastday[]
            tm &tmIn=GET_SELF(r, VDate).get_localtime();
            year=tmIn.tm_year+1900;
            month=tmIn.tm_mon;
      }
      r.write_no_lang(*new VInt(getMonthDays(year, month)));
}


// constructor

MDate::MDate(): Methoded("date") {
      // ^date::now[]
      add_native_method("now", Method::CT_DYNAMIC, _now, 0, 1);

      // ^date::create(float days)
      add_native_method("create", Method::CT_DYNAMIC, _create, 1, 6);
      // old name for compatibility with <= v1.17 2002/2/18 12:13:42 paf
      add_native_method("set", Method::CT_DYNAMIC, _create, 1, 6);

      // ^date.sql-string[]
      add_native_method("sql-string", Method::CT_DYNAMIC, _sql_string, 0, 0);

      // ^date.gmt-string[]
      add_native_method("gmt-string", Method::CT_DYNAMIC, _gmt_string, 0, 0);

      // ^date:lastday(year;month)
      // ^date.lastday[]
      add_native_method("last-day", Method::CT_ANY, _last_day, 0, 2);

      // ^date.roll(year|month|day;+/- 1)
      add_native_method("roll", Method::CT_DYNAMIC, _roll, 2, 2);

      // ^date:calendar[month|montheng;year;month]  = table
      // ^date:calendar[week|weekeng;year;month;day] = table
      add_native_method("calendar", Method::CT_STATIC, _calendar, 3, 4);


      // ^date.unix-timestamp[]
      // ^date::unix-timestamp[]
      add_native_method("unix-timestamp", Method::CT_DYNAMIC, _unix_timestamp, 0, 1);
}

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