import java.util.Random;
import java.util.Queue;
import java.util.LinkedList;

public class MapGrid extends Grid {

    protected int seed;
    protected int count; // variable to store number of continents

    char[][] continent;  // 2d char array to store continent identifier for each cell (i,j)
    int[] centrality;    // int array to store centrality for the capital of each continent 
    int[][] capital;     // 2d int array to store coordinates of the capital for each continent
    
    boolean[][] seen;    // 2d boolean array which is used in method findCapitals()
    Queue<Move> q;       // queue of moves used to enqueue neighbors of a cell (i,j)
    
    
    public MapGrid(int rows, int cols, int percentage, int seed) 
    // Preconditions: rows and cols > 0
    //                0 <= percentage <= 100
    //
    // Instantiates a grid of size rows by cols, where locations are set to 
    // indicate blob characters based on the percentage probability.
    {

	super(rows,cols,percentage);
	this.rows = rows;
	this.cols = cols;

	this.seed = seed; // seed to generate random numbers

	grid = new boolean [rows][cols];

	// to generate random numbers
	int randInt;
	Random rand = new Random(seed);

	for (int i = 0; i < rows; i++)
	    for (int j = 0; j < cols; j++)
		{
		    randInt = rand.nextInt(100);  // random number 0 .. 99
		    if (randInt < percentage)
			grid[i][j] = true;
		    else
			grid[i][j] = false;
		}
    }

    private void markBlob(int row, int col, int counter)
    // Mark position row, col as having been visited & also update each cell's continent identifier
    // Check and if appropriate mark locations above, below, left,
    // and right of that position.
    {
	visited[row][col] = true;
	continent[row][col]='a';       // updating each cell's continent identifier
	continent[row][col]+=counter;  // (counter is the current continent integer ID)
   
	// check above
	if ((row - 1) >= 0)           // if its on the grid
	    if (grid[row - 1][col])       // and has a blob character
		if (!visited[row - 1][col])   // and has not been visited
		    markBlob(row - 1, col,counter);       // then mark it
    
	// check below
	if ((row + 1) < rows)        // if its on the grid
	    if (grid[row + 1][col])       // and has a blob character
		if (!visited[row + 1][col])   // and has not been visited
		    markBlob(row + 1, col,counter);       // then mark it
    
	// check left
	if ((col - 1) >= 0)           // if its on the grid
	    if (grid[row][col - 1])       // and has a blob character
		if (!visited[row][col - 1])   // and has not been visited
		    markBlob(row, col - 1,counter);       // then mark it
    
	// check right
	if ((col + 1) < cols)        // if its on the grid
	    if (grid[row][col + 1])       // and has a blob character
		if (!visited[row][col + 1])   // and has not been visited
		    markBlob(row, col + 1, counter);       // then mark it
    }

    
    
    public String continentMap() { //  output the continent_map 

	String map = "";
	count = 0;
	
	visited = new boolean [rows][cols];  // true if location visited
	continent = new char[rows][cols];    // stores continent identifier for each blob 
	
	// initialize visited & continent
	for (int i = 0; i < rows; i++)
	    for (int j = 0; j < cols; j++){
		visited[i][j] = false;
		continent[i][j] = '-';
	    }

	// mark continents and update continent_map 
	for (int i = 0; i < rows; i++){
	    for (int j = 0; j < cols; j++){
		
		
		if (grid[i][j])		    
		    if (!visited[i][j]){
			markBlob(i, j,count); 
			count++;
		    }
		    		    
		
				
		map+=continent[i][j];

	    }
	    map+="\n";
	}
	return map;

    }

    private void enqueueNeighbors(int r,int c,int d){ 

    }

    public void findCapitals(){ 

    }
    
    public String capitalMap(){
	return "capital map not implemented here";
	
    }
    
    public void continentTable(){

    }
    
    


}