/**
 *  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 Kölling and David J. Barnes
 * @version 2016.02.29
 */

public class Game 
{
    private Parser parser;
    private Room currentRoom;
    private Player player;    
    /**
     * 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()
    {                                                                         
        Room outside, squirrl1,squirrl2, fox,find , wolf1, wolf2, home;            
      
        // create the rooms
        outside = new Room("起点");
        find =new Room("你发现了小松鼠也迷路了，打算带他回家");
        squirrl1 = new Room("到土豪松鼠洞里，由于你找回他的儿子小松鼠,送你一颗金松果",new Thing("金松果+1",10));
        squirrl2 = new Room("到土豪松鼠洞里,他们很伤心，好像发生了生命事情，你就匆匆走了");
        fox = new Room("到狡猾小狐狸洞里,被小狐狸骗走一颗金松果",new Thing("金松果-1，幸福感下降-50",-50));
        wolf1 = new Room("到穷酸大灰狼洞里，由于你拥有一颗金松果，成功换回自己的性命",new Thing("幸福感上升+",10));
        wolf2 = new Room("到穷酸大灰狼洞里，由于你没有任何东西给他，他把你关起来了",new Thing("幸福感下降-50",-50));
        home = new Room("恭喜你！到家了");
       
        
        // initialise room exits
        outside.setExit("east",squirrl2);
        outside.setExit("south",wolf2);
        outside.setExit("west",find);
        squirrl2.setExit("east",wolf2);
        squirrl2.setExit("south",null);
        squirrl2.setExit("north",home);
        squirrl1.setExit("east",wolf1);
        squirrl1.setExit("north",home);
        squirrl1.setExit("west",fox);
        fox.setExit("east",wolf2);
        fox.setExit("south",home);
        fox.setExit("west",null);
        wolf1.setExit("east",home);
        find.setExit("east",wolf2);
        find.setExit("south",null);
        find.setExit("west",squirrl1);
        currentRoom = outside;  // 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("谢谢你的游玩，再见哦~");
    }

    /**
     * Print out the opening message for the player.
     */
    private void printWelcome()
    {
        System.out.println();
        System.out.println("欢迎来到小白兔回家的故事！");
        System.out.println();
        System.out.println("让我们来一场艰辛的回家旅程吧!");
        System.out.println();
        System.out.println("如果你需要帮助，请输入help");
        System.out.println();
        System.out.println("你是小白兔，由于你和兔妈妈走散了，不得不靠自己回家 " );
        
       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("我不明白你什么意思");
            return false;
        }

        Word commandWord = command.getCommandWord();
         switch(commandWord){
            case HELP:
                 printHelp();
                 break;
            
            case GO:
                 goRoom(command);
                 break;
            case QUIT:
                 wantToQuit = quit(command);
                 break;
            case PICK:
                    pickThing();
            case EAT:
                    eatThing(command);
            break;
            case CHECK:
                    player.checkBag();
            break;
                   case LOOK:
                   lookRoom();
            break;
            
            }
             


        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("你不知道该如何操作了吗？");
        System.out.println();
        System.out.println("让我们来告诉你");
        System.out.println();
        System.out.println("你可以使用的指令有:");
        System.out.println();
        System.out.println("go :后面加要去的方向");
        System.out.println("quit:退出游戏");
        System.out.println("help：寻求帮助");
        System.out.println("look：寻找需要的东西");
        System.out.println("check：查看背包");
        System.out.println("pick：获得物品");
        System.out.println("eat：使用物品");

    }

    /** 
     * 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("去哪里？");
            return;
        }

        String direction = command.getSecondWord();

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

        if (nextRoom == null) {
            System.out.println("你回到原点呢！");
        }
        else {
            currentRoom = nextRoom;
            System.out.println("你正在 " + currentRoom.getDescription());
            currentRoom.printExits();
        }
    }
    private void lookRoom()
    {
        if(currentRoom.getThing()==null)
            System.out.println("没有什么变化");
        else System.out.println("这里有 "+currentRoom.getThing().getName());
    }
    private void pickThing()
    {
        player.pick(currentRoom.getThing());
        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("你是否准备用它？");
            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("退出?");
            return false;
        }
        else {
            return true;  // signal that we want to quit
        }
    }
}