int selectedLevel = 0;
int unlockedLevel = 0;
int cellSize = 16;
int xOffset = 0;
int yOffset = 0;
boolean hasMultipleTargetsOrBoxes = false;
String[] grid;
String[] objects;
int rows = 0;
int columns = 0;
StringList moves = new StringList();

void drawLevelSelect() {
  background(#000000);
  
  textAlign(CENTER, CENTER);
  
  textFont(headingFont);
  fill(#FFFFFF);
  text("Select a level", width / 2, 32);
  
  textFont(textFont);
  text("UP / DOWN to select, ENTER to play", width / 2, 75);
  
  for (int i = 0; i < levels.length; i++) {
    if (selectedLevel == i && i > unlockedLevel) {
      fill(#FF0000);
    } else if (selectedLevel == i) {
      fill(#00FF00);
    } else if (i > unlockedLevel) {
      fill(#555555);
    } else {
      fill(#FFFFFF);
    }
    
    text(levels[i][0], width / 2, 120 + i * 20);
  }
}

void keyPressedLevelSelect() {
  if (keyCode == ENTER) {
    startGame(selectedLevel);
  } else if (keyCode == UP) {
    selectedLevel--;
  } else if (keyCode == DOWN) {
    selectedLevel++;
  }
  
  if (selectedLevel < 0) {
    selectedLevel = levels.length - 1;
  } else if (selectedLevel >= levels.length) {
    selectedLevel = 0;
  }
}

void startGame(int level) {
  if (level > unlockedLevel) return;
  
  gameState = GAME_LEVEL_INFO;
  
  moves.clear();
  
  String[] levelData = levels[level];
  
  grid = new String[levelData.length - 2];
  objects = new String[levelData.length - 2];
  
  StringList targets = new StringList();
  StringList boxes = new StringList();
  
  for (int y = 0; y < levelData.length - 2; y++) {
    grid[y] = levelData[y + 2].replaceAll("[\\$a-z]", " ").replaceAll("\\.", "Z").replaceAll("\\*", "Z");
    objects[y] = levelData[y + 2].replaceAll("@", "z").replaceAll("\\*", "z").replaceAll("[^a-z]", " ");
    
    for (int x = 0; x < grid[y].length(); x++) {
      char tile = grid[y].charAt(x);
      char box = objects[y].charAt(x);
      
      if (!targets.hasValue("" + tile) && tile >= 'A' && tile <= 'Z') {
        targets.push("" + tile);
      }
      
      if (!boxes.hasValue("" + box) && box >= 'a' && box <= 'z') {
        boxes.push("" + box);
      }
    }
    
    if (levelData[y + 2].indexOf("$") >= 0) {
      playerY = y;
      playerX = levelData[y + 2].indexOf("$");
    }
  }
    
  targets.sort();
  targets.lower();
  boxes.sort();
  
  hasMultipleTargetsOrBoxes = targets.size() > 1 || boxes.size() > 1 || !join(targets.array(), "").equals(join(boxes.array(), ""));
  
  columns = grid[0].length();
  rows = grid.length;
  
  if (columns > rows) {
    cellSize = (width - 20) / columns;
  } else {
    cellSize = (height - 20) / rows;
  }
  
  xOffset = (width - cellSize * columns) / 2;
  yOffset = (height - cellSize * rows) / 2;
}