//: C20:Thesaurus.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
// A map of vectors
#include <map>
#include <vector>
#include <string>
#include <iostream>
#include <algorithm>
#include <ctime>
using namespace std;

typedef map<string, vector<string> > Thesaurus;
typedef pair<string, vector<string> > TEntry;
typedef Thesaurus::iterator TIter;

ostream& operator<<(ostream& os,const TEntry& t){
  os << t.first << ": ";
  copy(t.second.begin(), t.second.end(),
    ostream_iterator<string>(os, " "));
  return os;
}

// A generator for thesaurus test entries:
class ThesaurusGen {
  static const string letters;
  static int count;
public:
  int maxSize() { return letters.size(); }
  ThesaurusGen() { srand(time(0)); }
  TEntry operator()() {
    TEntry result;
    if(count >= maxSize()) count = 0;
    result.first = letters[count++];
    int entries = (rand() % 5) + 2;
    for(int i = 0; i < entries; i++) {
      int choice = rand() % maxSize();
      char cbuf[2] = { 0 };
      cbuf[0] = letters[choice];
      result.second.push_back(cbuf);
    }
    return result;
  }
};

int ThesaurusGen::count = 0;
const string ThesaurusGen::letters("ABCDEFGHIJKL"
  "MNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz");

int main() {
  Thesaurus thesaurus;
  // Fill with 10 entries:
  generate_n(
    inserter(thesaurus, thesaurus.begin()), 
    10, ThesaurusGen());
  // Print everything:
  copy(thesaurus.begin(), thesaurus.end(),
    ostream_iterator<TEntry>(cout, "\n"));
  // Ask for a "word" to look up:
  while(true) {
    cout << "Select a \"word\", 0 to quit: ";
    for(TIter it = thesaurus.begin(); 
      it != thesaurus.end(); it++)
      cout << (*it).first << ' ';
    cout << endl;
    string reply;
    cin >> reply;
    if(reply.at(0) == '0') return 0; // Quit
    if(thesaurus.find(reply) == thesaurus.end())
      continue; // Not in list, try again
    vector<string>& v = thesaurus[reply];
    copy(v.begin(), v.end(), 
      ostream_iterator<string>(cout, " "));
    cout << endl;
  }
} ///:~