#include <iostream.h>
#include <fstream.h>
#include "CPstring.h"
#include "guess.h"

GuessGame::GuessGame()
  : myRoot(0)
{
   // all initialized    
}

GuessGame::~GuessGame()
{
    DoDelete(myRoot);
}


void GuessGame::BuildTree(istream & input,TreeNode * & root)
// precondition: input open for reading, properly formed
// postcondition: root points to a tree formed from contents of input
{
    string s;

    if (getline(input,s))               // input succeeded?
    {
	if (s.substr(0,3) == "#Q:")     // add a question
	{
	    root = new TreeNode(s.substr(3,s.length()));
	    BuildTree(input,root->left);
	    BuildTree(input,root->right);
	}
	else
	{
	    root = new TreeNode(s);         // add an answer
	}
    }
    else
    {
	cerr << "error: no input" << endl;
	root = 0;
    }
}

void GuessGame::ReadFile(const string & filename)
// postcondition: reads file, builds tree from contents     
{
    ifstream input(filename);

    if (input.fail())
    {
	cerr << "could not read from " << filename << endl;
	exit(1);
    }
    BuildTree(input,myRoot);
}