/**
 *  This class is the main class of the "World of Zuul" application. 
 *  "World of Zuul" is a very simple, text based adventure game.  Users 
 *  can walk around some scenery. That's all. It should really be extended 
 *  to make it more interesting!
 * 
 *  To play this game, create an instance of this class and call the "play"
 *  method.
 * 
 *  This main class creates and initialises all the others: it creates all
 *  rooms, creates the parser and starts the game.  It also evaluates and
 *  executes the commands that the parser returns.
 * 
 * @author  Michael K?lling and David J. Barnes
 * @version 2016.02.29
 */

public class Game 
{
    private Parser parser;
    private Room currentRoom;
    private Player player;
    Room R0_0,R1_1, R1_2, R1_3, R1_5, R2_1, R2_2, R2_3, R2_4, R2_5,R3_1,R3_2,R3_3,R3_4,R3_5,R3_6,R4_1,R4_3,R4_5,R4_6,R5_1,R5_3,R5_4,R5_5,R5_6;
      
    /**
     * Create the game and initialise its internal map.
     */
    public Game() 
    {
        createRooms();
        parser = new Parser();
        player = new Player();
    }

    /**
     * Create all the rooms and link their exits together.
     */
    private void createRooms()
    {
      
        // create the rooms
        R1_1 = new Room("R1_1");
        R1_2 = new Room("R1_2", new Thing("小药剂", 20));
        R1_3 = new Room("R1_3");
        R1_5 = new Room("R1_5", new Trap("剧毒蝙蝠", 50));
        R2_1 = new Room("R2_1");
        R2_2 = new Room("R2_2");
        R2_3 = new Room("R2_3", new Thing("药剂", 30));
        R2_4 = new Room("R2_4", new Trap("小蝙蝠", 10));
        R2_5 = new Room("R2_5");
        R3_1 = new Room("R3_1", new Trap("蝙蝠群", 30));
        R3_2 = new Room("R3_2", new Trap("老鼠", 20));
        R3_3 = new Room("R3_3");
        R3_4 = new Room("R3_4", new Trap("蛇", 10));
        R3_5 = new Room("R3_5");
        R3_6 = new Room("R3_6", new Thing("金钥匙"));
        R4_1 = new Room("R4_1", new Thing("恢复药", 100));
        R4_3 = new Room("R4_3", new Thing("小药剂", 20));
        R4_5 = new Room("R4_5", new Thing("药剂", 30));
        R4_6 = new Room("R4_6");
        R5_1 = new Room("R5_1", new Thing("铜钥匙"));
        R5_3 = new Room("R5_3", new Trap("蝙蝠群", 30));
        R5_4 = new Room("R5_4", new Thing("银钥匙"));
        R5_5 = new Room("R5_5", new Trap("蝎子", 20));
        R5_6 = new Room("R5_6", new Trap("蝎子群", 30));
        
        R1_1.setExit("north", R2_1);
        R1_1.setExit("east", R1_2);
        R1_2.setExit("west", R1_1);
        R1_2.setExit("east", R1_3);
        R1_3.setExit("north", R2_3);
        R1_3.setExit("west", R1_2);
        R1_5.setExit("north", R2_5);
        R2_5.setExit("south", R1_5);
        R2_5.setExit("north", R3_5);
        R2_1.setExit("north", R3_1);
        R2_1.setExit("south", R1_1);
        R2_1.setExit("west", R2_5);
        R2_1.setExit("east", R2_2);
        R2_2.setExit("north", R3_2);
        R2_2.setExit("west", R2_1);
        R2_3.setExit("south", R1_3);
        R2_3.setExit("east", R2_4);
        R2_4.setExit("west", R2_3);
        R2_4.setExit("north", R3_4);
        R3_5.setExit("north", R4_5);
        R3_5.setExit("south", R2_5);
        R3_1.setExit("south", R2_1);
        R3_1.setExit("north", R4_1);
        R3_2.setExit("south", R2_2);
        R3_2.setExit("east", R3_3);
        R3_3.setExit("north", R4_3);
        R3_3.setExit("west", R3_2);
        R3_3.setExit("east", R3_4);
        R3_4.setExit("west", R3_3);
        R3_4.setExit("south", R2_4);
        R4_6.setExit("north", R5_6);
        R4_6.setExit("east", R4_5);
        R4_5.setExit("north", R5_5);
        R4_5.setExit("west", R4_6);
        R4_5.setExit("south", R3_5);
        R4_1.setExit("north", R5_1);
        R4_1.setExit("south", R3_1);
        R4_3.setExit("south", R3_3);
        R5_6.setExit("east", R5_5);
        R5_6.setExit("south", R4_6);
        R5_5.setExit("west", R5_6);
        R5_5.setExit("south", R4_5);
        R5_1.setExit("south", R4_1);
        R5_3.setExit("east", R5_4);
        R5_4.setExit("west", R5_3);
        currentRoom = R1_1;  // start game outside
    }

    /**
     *  Main play routine.  Loops until end of play.
     */
    public void play() 
    {            
        printWelcome();

        // Enter the main command loop.  Here we repeatedly read commands and
        // execute them until the game is over.
                
        boolean finished = false;
        while (! finished) {
            Command command = parser.getCommand();
            finished = processCommand(command);
        }
        System.out.println("Thank you for playing.  Good bye.");
    }

    /**
     * Print out the opening message for the player.
     */
    private void printWelcome()
    {
        System.out.println();
        System.out.println("欢迎来到无限迷宫!");
        System.out.println("在这里不能攻击任何怪物，想要走出迷宫，请勇往直前吧。");
        System.out.println("输入 'help' 如果你需要帮助.");
        System.out.println();
        System.out.println("你在 " + currentRoom.getDescription());
        currentRoom.printExits();
    }

    /**
     * Given a command, process (that is: execute) the command.
     * @param command The command to be processed.
     * @return true If the command ends the game, false otherwise.
     */
    private boolean processCommand(Command command) 
    {
        boolean wantToQuit = false;

        if(command.isUnknown()) {
            System.out.println("I don't know what you mean...");
            return false;
        }

        Word commandWord = command.getCommandWord();
        switch(commandWord) {
           case HELP:
              printHelp();
              break;
           case GO:
              goRoom(command);
              break;
           case QUIT:
              quit(command) ;
              break;
           case PICK:
              pickThing();
              break;
           case EAT: 
              eatThing(command);
              break;
           case CHECK:
              player.checkBag();
              break;
           case LOOK:
              lookRoom();
              break;
        }
        
        if(player.isDead()){
           wantToQuit = true;
           System.out.println("你死了");
        }
        
        if(currentRoom == R0_0){
          wantToQuit = true;
          System.out.println("欢迎来到下一层............");
        }
        return wantToQuit;
    }

    // implementations of user commands:

    /**
     * Print out some help information.
     * Here we print some stupid, cryptic message and a list of the 
     * command words.
     */
    private void printHelp() 
    {
        System.out.println("You are lost. You are alone. You wander");
        System.out.println("around at the university.");
        System.out.println();
        System.out.println("Your command words are:");
        System.out.println("   go quit help look check pick eat");
    }

    /** 
     * Try to go in one direction. If there is an exit, enter
     * the new room, otherwise print an error message.
     */
    private void goRoom(Command command) 
    {
        if(!command.hasSecondWord()) {
            // if there is no second word, we don't know where to go...
            System.out.println("Go where?");
            return;
        }
        
        String direction = command.getSecondWord();

        // Try to leave current room.
        Room nextRoom = currentRoom.goNext(direction);

        if (nextRoom == null) {
            System.out.println("There is no door!");
        }
        else {
            currentRoom = nextRoom;
            System.out.println("你在 " + currentRoom.getDescription());
            currentRoom.printExits();
            if(currentRoom.getTrap()!=null){
                player.monster(currentRoom.getTrap().getEnergy());
                System.out.println("你遇到了"+currentRoom.getTrap().getName()+"并扣除："+currentRoom.getTrap().getEnergy());
            }
        }
    }
    private void lookRoom()
    {
        if(currentRoom.getThing()==null)
            System.out.println("nothing in there!");
        else System.out.println(currentRoom.getThing().getName());
    }
    private void pickThing()
    {
        player.pick(currentRoom.getThing());
        if(currentRoom.getThing().getName() == "铜钥匙")
        {
            R5_3.setExit("south", R4_3);
            R4_3.setExit("north", R5_3);
            System.out.println("你打开了R4_3通往R5_3路");
        }
        if(currentRoom.getThing().getName() == "银钥匙")
        {
            R3_6.setExit("north", R4_6);
            R4_6.setExit("south", R3_6);
            System.out.println("你打开了R4_6通往R3_6路");
        }
        if(currentRoom.getThing().getName() == "金钥匙")
        {
            R0_0.setExit("north", R1_1);
            R1_1.setExit("south", R0_0);
            System.out.println("你打开了通往终点的门，但是门在哪里呢?也许你可以回去看看!");
        }
        currentRoom.remove();
    }
    private void eatThing(Command command)
    {
        if(!command.hasSecondWord()) {
            // if there is no second word, we don't know where to go...
            System.out.println("Eat something?");
            return;
        }
        player.eat(command.getSecondWord());
    }
    /** 
     * "Quit" was entered. Check the rest of the command to see
     * whether we really quit the game.
     * @return true, if this command quits the game, false otherwise.
     */
    private boolean quit(Command command) 
    {
        if(command.hasSecondWord()) {
            System.out.println("Quit what?");
            return false;
        }
        else {
            return true;  // signal that we want to quit
        }
    }
}