// SubStr4.cpp
// The source file for the SubStr4 class.

#include "SubStr4.h"
#include <iostream>

SubStr4::SubStr4(char *val,int num) {
	str[0]=val[0];
	str[1]=val[1];
	str[2]=val[2];
	str[3]=val[3];
	index=num;
	english=0;
}

SubStr4::SubStr4(FILE *fin) {
	read(fin);
}

SubStr4::SubStr4(FILE *fin,int num) {
	fseek(fin,256*num,SEEK_SET);
	read(fin);
}

SubStr4::SubStr4(FILE *fin,char *val) {
	fseek(fin,256*SubStr4::calcIndex(val),SEEK_SET);
	read(fin);
}

int SubStr4::write(FILE *fout) const {
	fwrite(str,sizeof(char),4,fout);
	fwrite(&index,sizeof(int),1,fout);
	fwrite(&english,sizeof(int),1,fout);
	char buf[256];
	for(int i=0; i<256; i++) buf[i]=0;
	fwrite(buf,sizeof(char),256-(4*sizeof(char)+2*sizeof(int)),fout);
	return 0;
}

int SubStr4::writeRandom(FILE *fout) const {
	fseek(fout,256*index,SEEK_SET);
	return write(fout);
}

void SubStr4::print() const {
	cout << str[0] << str[1] << str[2] << str[3] << " " <<
			index << " " << english << endl;
}

int SubStr4::compare(const SubStr &s) const {
	for(int i=0; (i<4) && (i<s.getLength()); i++) {
		if(s[i]<str[i]) return -1;
		if(s[i]>str[i]) return 1;
	}
	if(s.getLength()<4) return -1;
	if(s.getLength()>4) return 1;
	return 0;
}

int SubStr4::compare(const string &s) const {
	for(int i=0; (i<4) && (i<s.length()); i++) {
		if(s[i]<str[i]) return -1;
		if(s[i]>str[i]) return 1;
	}
	if(s.length()<4) return -1;
	if(s.length()>4) return 1;
	return 0;
}

int SubStr4::getLength() const {
	return 4;
}

int SubStr4::getEnglish() const {
	return english;
}

void SubStr4::setEnglish() {
	english=1;
}

void SubStr4::clearEnglish() {
	english=0;
}

char SubStr4:: operator[](int n) const {
	if((n<0) || (n>3)) return 0;
	return str[n];
}

int SubStr4::maxToGen() {
	return 26*26*26*26;
}

// Do a conversion from an integer to what substring should be at that location.
void SubStr4::generate(FILE *fout,int num) {
	SubStr4 ret;
	ret.index=num;
	ret.str[3]=num%26 + 'a';
	num/=26;
	ret.str[2]=num%26 + 'a';
	num/=26;
	ret.str[1]=num%26 + 'a';
	num/=26;
	ret.str[0]=num%26 + 'a';
	ret.write(fout);
}

// Do a conversion from 4 chars to a number.
int SubStr4::calcIndex(char *val) {
	int ret=0;
	for(int i=3,p=1; i>=0; p*=26,i--) {   // aaaa=0
		ret+=p*(val[i]-'a');
	}
	return ret;
}

int SubStr4::stringLength() {
	return 4;
}

SubStr4::SubStr4() {
	index=0;
	english=0;
}

void SubStr4::read(FILE *fin) {
	fread(str,sizeof(char),4,fin);
	fread(&index,sizeof(int),1,fin);
	fread(&english,sizeof(int),1,fin);
	char buf[256];
	fread(buf,sizeof(char),256-(4*sizeof(char)+2*sizeof(int)),fin);
}