package main;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import lifter.Lifter;
import lifter.Request;
import java.awt.*;

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;

public class Main extends JFrame implements ActionListener {//function: main,entry of the program
	private static Container[] container;//容器用于建立圖形時用

	private static int row;//行，大樓的高度。

	private static int column;//電梯的數目。

	public static Request receiverequest;//外部發出的請求。

	public static Lifter[] lifters;//生成的電梯，此時沒有初始化。

	public static Lifter choosedLifter = null;//選中的電梯，調度的時候用。

	
	public class Request {
		public List<Integer> requestedFloor= (List)new java.util.ArrayList<Integer>(); ;
		public int floorSentRequest;
		public int upordown;
	}
	

	

	public static void main(String[] args) {//入口函數。

		// Promt the user to enter the number of the lift
		String rowString = JOptionPane.showInputDialog(null, "請輸入樓層數", "輸入",
				JOptionPane.QUESTION_MESSAGE);

		// Promt the user to enter the number of the elevator
		String columnString = JOptionPane.showInputDialog(null, "請輸入電梯數", "輸入",
				JOptionPane.QUESTION_MESSAGE);

		
		try {
			row = Integer.parseInt(rowString);//從對話框中獲得大樓的高度和電梯的數目。
			column = Integer.parseInt(columnString);

			

			container = new Container[column + 2];//用于界面的布局。
			for (int iii = 0; iii <column + 2; iii++) {
				container[iii] = new Container();
			}

			Main m = new Main();//設置界面。
			m.setTitle("歡迎使用電梯系統");
			m.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
			m.setVisible(true);

			container[0] = m.getContentPane();
			container[0].setLayout(new GridLayout(1, column + 1, 5, 5));
			container[1].setLayout(new GridLayout(row, 3, 5, 5));
			container[0].add(container[1]);
			for(int ii = 2; ii < column + 2; ii ++){
				container[ii].setLayout(new GridLayout(1, row, 5, 5));
				container[0].add(container[ii]);
			}
			/*container[2].setLayout(new GridLayout(row, 2, 5, 5));
			container[3].setLayout(new GridLayout(1, column, 5, 5));
			container[0].add(container[1]);
			container[0].add(container[2]);
			container[0].add(container[3]);*/

			// Set GirdLayout,gaps 5 between compontent horizontally and vertically

			// Add buttons to frame

			for (int i = row; i >= 1; i--) {//增加外部請求的按鈕。	
				JLabel b = new JLabel("        " + i);
				container[1].add(b);
				
				//JButton a = new JButton("up " + i);
				//JButton a = new JButton("∧");
				JButton a = new JButton("up " + i);
				a.addActionListener(m);//每個按鈕的listener為m
				container[1].add(a);

				//JButton aa = new JButton("down " + i);//增加外部請求的按鈕。
				//JButton aa = new JButton("∨");
				JButton aa = new JButton("down " + i);
				aa.addActionListener(m);
				container[1].add(aa);
			}

			lifters = new Lifter[column];//電梯的初始化。電梯的繪制也在這里進行。
			for (int ii = 0; ii < column; ii++) {
				lifters[ii] = new Lifter(row, 0, 0, container[ii + 2]);
			}

			for (int i = 0; i < lifters.length; i++) {
				new Thread(lifters[i]).start();//讓新繪制的電梯啟動
			}
		} catch (NumberFormatException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

	public synchronized void actionPerformed(ActionEvent e) {//外部請求得主響應函數。

		String estr = e.getActionCommand();
		if (estr.charAt(0) == 'u' ||estr.charAt(0) == 'd') {
			//if (estr.equals("up") == true ||estr.equals("down") == true) {
			receiverequest = new Request();
			receiverequest.floorSentRequest = Integer.parseInt(estr
					.substring(estr.indexOf(" ") + 1));
			if (estr.charAt(0) == 'u')
				//if (estr.equals("up") == true)
				receiverequest.upordown = 1;
			if (estr.charAt(0) == 'd')
				//if (estr.equals("down") == true)	
			    receiverequest.upordown = -1;

			choosedLifter = chooseLifter(lifters, receiverequest);// 從電梯中選者一部電梯,如果沒有符合條件的電梯就返回空.

			if (choosedLifter != null) { // 如果返回為空,即當前沒有電梯符合條件,當前請求就被忽視
				choosedLifter.printDest();//輸出destFloors的狀態。
				if ((receiverequest.upordown == 1&&choosedLifter.currentFloor<receiverequest.floorSentRequest)||(receiverequest.upordown==-1&&choosedLifter.currentFloor<receiverequest.floorSentRequest)) {
					choosedLifter.addDestUp(new Integer(
							receiverequest.floorSentRequest));// 往選中的電梯目標隊列當中添加receiverequest.floorsentrequest
					choosedLifter.moveState=1;
				}else if((receiverequest.upordown==-1&&choosedLifter.currentFloor>receiverequest.floorSentRequest)||(receiverequest.upordown == 1&&choosedLifter.currentFloor>receiverequest.floorSentRequest)){
					choosedLifter.addDestDown(new Integer(receiverequest.floorSentRequest));
					choosedLifter.moveState=-1;
				}
				choosedLifter.printDest();
				if (choosedLifter.flag == 1) { // 如果當前電梯可以開啟的話就開啟，不能開啟意味著此電梯已經開啟。對已經開啟的電梯只需要讓他跑完就可以了。
					// flag為０的情況是：電梯已經開啟，下一個請求還是選中了這部電梯，
					new Thread(choosedLifter).start();

					choosedLifter.flag = 0; // 當電梯隊列里的成員都被跑完后，flag會改為１
				}
			}
			// System.out.println("5");
			receiverequest = null;
		}

	}

	public static synchronized Lifter chooseLifter(Lifter[] l,
			Request receiverequest) {// 選者電梯
		Lifter choosedLifter = null;
		int temp, temp2;

		if (receiverequest != null) {
			if (receiverequest.upordown == 1) {//向上的話就從該樓層以下的電梯里選者同向的電梯。
				try {
					temp = Math.abs(receiverequest.floorSentRequest
							- l[0].currentFloor);
					for (int i = 0; i < l.length; i++) {
						if (l[i].currentFloor <= receiverequest.floorSentRequest
								&& l[i].moveState == receiverequest.upordown) {
							if (temp >= Math
									.abs(receiverequest.floorSentRequest
											- l[i].currentFloor)) {
								choosedLifter = l[i];
								temp = Math.abs(receiverequest.floorSentRequest
										- l[i].currentFloor);
							}
						}
					}
				} catch (Exception e) {
				} finally {
					if (choosedLifter == null) {//如果沒有找到合適的就從靜止的電梯中找離它最近的，再沒有找到的話就忽視該請求
						temp2 = Math.abs(receiverequest.floorSentRequest
								- l[0].currentFloor);
						for (int j = 0; j < l.length; j++) {
							if (l[j].moveState == 0) {
								if (temp2 >= Math
										.abs(receiverequest.floorSentRequest
												- l[j].currentFloor)) {
									choosedLifter = l[j];
									temp2 = Math
											.abs(receiverequest.floorSentRequest
													- l[j].currentFloor);
								}
							}
						}
					}
				}
			}
			if (receiverequest.upordown == -1) {//向下的話就從該樓層以上的電梯里選者同向的電梯。
				try {
					temp = Math.abs(l[0].currentFloor
							- receiverequest.floorSentRequest);
					for (int i = 0; i < l.length; i++) {
						if (l[i].currentFloor >= receiverequest.floorSentRequest
								&& l[i].moveState == receiverequest.upordown) {
							if (temp >= l[i].currentFloor
									- receiverequest.floorSentRequest) {
								choosedLifter = l[i];
								temp = l[i].currentFloor
										- receiverequest.floorSentRequest;
							}
						}
					}
				} catch (Exception e) {
				} finally {
					if (choosedLifter == null) {//如果沒有找到合適的就從靜止的電梯中找離它最近的。
						temp2 = Math.abs(receiverequest.floorSentRequest
								- l[0].currentFloor);
						for (int j = 0; j < l.length; j++) {
							if (l[j].moveState == 0) {
								if (temp2 >= receiverequest.floorSentRequest
										- l[j].currentFloor) {
									choosedLifter = l[j];
									temp2 = receiverequest.floorSentRequest
											- l[j].currentFloor;
								}
							}
						}
					}
				}
			}
		}
		return choosedLifter;//返回選中的電梯。
	}
}