#include <fstream.h>
#include <iostream.h>
#include <stdlib.h>
#include "maze.h"


static void PrintUsage() {
  cout << endl;
  cout << "Command Summary" << endl;
  cout << "---------------" << endl;
  cout << "  (h)elp" << endl;
  cout << "  (q)uit" << endl;
  cout << endl;
  cout << "  (m)aze of size" << endl;
  cout << "  (p)osition in maze" << endl;
  cout << "  (g)oal position" << endl;
  cout << endl;
  cout << "  (N)orth look" << endl;
  cout << "  (S)outh look" << endl;
  cout << "  (E)ast look" << endl;
  cout << "  (W)est look" << endl;
  cout << endl;
  cout << "  (n)orth move" << endl;
  cout << "  (s)orth move" << endl;
  cout << "  (e)orth move" << endl;
  cout << "  (w)orth move" << endl;
  cout << endl;
  cout << "  (j)ump -- must also specify row, col coordinates" << endl;
  cout << endl;
  cout << "  (v)iew maze" << endl;
  cout << "  (d)ump maze (debug print view)" << endl;
  cout << endl;
}


static void PrintPosition(int row, int col) {
  cout << "(" << row << "," << col << ")";
}


static void ProcessLook(Maze& mymaze,char look) {
  direction dir;
  status stat;

  switch (look) {
  case 'N':
    dir = north;
    break;
  case 'S':
    dir = south;
    break;
  case 'E':
    dir = east;
    break;
  case 'W':
    dir = west;
    break;
  }

  stat = mymaze.Look(dir);

  switch (stat) {
  case POS_BLOCKED:
    cout << "That direction is blocked" << endl;
    break;
  case POS_CLEAR:
    cout << "That direction is clear" << endl;
    break; 
  case POS_GOAL:
    cout << "That direction is clear (and contains the goal)" << endl;
    break;
 }    
}


static void ProcessMove(Maze& mymaze,char move) {
  direction dir;
  status stat;

  switch (move) {
  case 'n':
    dir = north;
    break;
  case 's':
    dir = south;
    break;
  case 'e':
    dir = east;
    break;
  case 'w':
    dir = west;
    break;
  }

  stat = mymaze.Move(dir);

  switch (stat) {
  case POS_BLOCKED:
    cout << "Cannot move in that direction" << endl;
    break;
  case POS_CLEAR:
    cout << "Moved successfully" << endl;
    break; 
  case POS_GOAL:
    cout << "Moved successfully (to the goal)" << endl;
    break;
 }    
}


static void ProcessJump(Maze& mymaze) {
  int row,col;
  status stat;

  cin >> row >> col;

  stat = mymaze.Jump(row,col);
 
  switch (stat) {
  case POS_UNVISITED:
    cout << "You've never been to ";
    PrintPosition(row,col);
    cout << " before" << endl;
    break;
  case POS_BLOCKED:
    cout << "That position contains a wall" << endl;
    break;
  case POS_CLEAR:
    cout << "Successful jump" << endl;
    break;
  case POS_GOAL:
    cout << "Successful jump (to the exit)" << endl;
    break;
  }
}


static void RunMaze(char* progname, char* filename) {
  Maze mymaze(filename);
  char command;
  int row,col;

  cout << "Type 'h' for help" << endl;
  do {
    cout << progname << "> ";
    cin >> command;

    switch (command) {
    case 'h':
      PrintUsage();
      break;
    case 'q':
      break;
    case 'm':
      mymaze.Size(row,col);
      cout << "Maze size = " << row << " x " << col << endl;
      break;
    case 'p':
      mymaze.Position(row,col);
      cout << "Current position = ";
      PrintPosition(row,col);
      cout << endl;
      break;
    case 'g':
      mymaze.Goal(row,col);
      cout << "Goal position = ";
      PrintPosition(row,col);
      cout << endl;
      break;

    case 'N':
    case 'S':
    case 'E':
    case 'W':
      ProcessLook(mymaze,command);
      break;

    case 'n':
    case 's':
    case 'e':
    case 'w':
      ProcessMove(mymaze,command);
      break;

    case 'j':
      ProcessJump(mymaze);
      break;

    case 'v':
      cout << endl;
      mymaze.Print();
      cout << endl;
      break;
    case 'd':
      cout << endl;
      mymaze.Print(0);
      cout << endl;
      break;
    default:
      cerr << "Unrecognized command: '" << command << "' (" << (int)command << ")" << endl;
      break;
    }

  } while (command != 'q');
}


void main(int argc, char* argv[]) {
  char filename[80];

  cout << "Enter maze filename: ";
  cin >> filename;

  RunMaze(argv[0],filename);
}