//package todo;

import java.util.HashMap;

import spark.Filter;
import spark.Request;
import spark.Response;
import spark.Spark;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


/**
 * Main class that sets up the to-do server, which allows users to read and
 * update a to-do list.
 */
public class TodoServer {

  private static Logger log = LoggerFactory.getLogger(TodoServer.class);


  public static void main(String[] args) {
    CorsFilter.apply(); // make this easier to use in development
                        // this would be disabled in production

    Spark.before((request, response) -> {
        log.info(request.requestMethod() + " " + request.url());
    });

    // Stores the current to-do list (just in memory... not saved anywhere).
    TodoList list = new TodoList(5);  // 5 seconds just for demo

    // Return the current list with one item per line.
    Spark.get("/list", (req, res) -> {
      res.type("text/plain");
      return list.describe();
    });

    // Adds the given item (?name=...) if not already present.
    Spark.post("/add", (req, res) -> {
      String name = req.queryParams("name");
      if (name == null) {
        res.status(400);
        return "name missing";
      } else {
        res.type("text/plain");
        if (!list.has(name)) {
          list.add(name);
          return "added";
        } else {
          return "added already";
        }
      }
    });

    // Marks the given item as completed (right now).
    Spark.post("/completed", (req, res) -> {
      String name = req.queryParams("name");
      if (name == null) {
        res.status(400);
        return "name missing";
      } else if (!list.has(name)) {
        res.status(400);
        return "item not found";
      } else {
        res.type("text/plain");
        list.completed(name);
        return "done";
      }
    });
  }

}


/**
 * Simple Spark filter to set CORS headers on all responses
 */
final class CorsFilter {
    
    private static final HashMap<String, String> corsHeaders = new HashMap<String, String>();
    
    static {
        corsHeaders.put("Access-Control-Allow-Methods", "GET,PUT,POST,DELETE,OPTIONS");
        corsHeaders.put("Access-Control-Allow-Origin", "*");
        corsHeaders.put("Access-Control-Allow-Headers", "Content-Type,Authorization,X-Requested-With,Content-Length,Accept,Origin,");
        corsHeaders.put("Access-Control-Allow-Credentials", "true");
    }

    public final static void apply() {
        Filter filter = new Filter() {
            @Override
            public void handle(Request request, Response response) throws Exception {
                corsHeaders.forEach((key, value) -> {
                    response.header(key, value);
                });
            }
        };
        Spark.after(filter);
    }
}