package com.zgrjb.selfdefindui;

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.BaseAdapter;
import android.widget.FrameLayout;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.ProgressBar;

import com.zgrjb.R;

public class DropdownListView extends ListView implements OnScrollListener {

	private static final String TAG = "listview";

	private final static int RELEASE_To_REFRESH = 0;
	private final static int PULL_To_REFRESH = 1;
	private final static int REFRESHING = 2;
	private final static int DONE = 3;
	private final static int LOADING = 4;

	// 实际的padding的距离与界面上偏移距离的比例
	private final static int RATIO = 3;

	private LayoutInflater inflater;
	private FrameLayout fl;
	private LinearLayout headView;

//	private View line;
	private ProgressBar progressBar;

//	private RotateAnimation animation;
//	private RotateAnimation reverseAnimation;

	// 用于保证startY的值在一个完整的touch事件中只被记录一次
	private boolean isRecored;

	private int headContentWidth;
	private int headContentHeight;

	private int startY;
	private int firstItemIndex;

	private int state;

	private boolean isBack;

	private OnRefreshListenerHeader refreshListenerHeader;


	private boolean isRefreshableHeader;

	
	public DropdownListView(Context context) {
		super(context);
		init(context);
	}

	public DropdownListView(Context context, AttributeSet attrs) {
		super(context, attrs);
		init(context);
	}

	private void init(Context context) {
		setCacheColorHint(context.getResources().getColor(R.color.transparent));
		inflater = LayoutInflater.from(context);
		
		fl = (FrameLayout)inflater.inflate(R.layout.dropdown_lv_head, null);
		headView = (LinearLayout) fl.findViewById(R.id.drop_down_head);

		progressBar = (ProgressBar) fl.findViewById(R.id.loading);
		measureView(headView);
		
		
		headContentHeight = headView.getMeasuredHeight();
		headContentWidth = headView.getMeasuredWidth();

		headView.setPadding(0, -1 * headContentHeight, 0, 0);
		headView.invalidate();

		Log.v("size", "width:" + headContentWidth + " height:"
				+ headContentHeight);

		addHeaderView(fl, null, false);
//		addHeaderView(headView, null, false);
		setOnScrollListener(this);


		state = DONE;
		isRefreshableHeader = false;
	}

	public void onScroll(AbsListView arg0, int firstVisiableItem, int arg2,
			int arg3) {
		firstItemIndex = firstVisiableItem;
	}

	public void onScrollStateChanged(AbsListView arg0, int scrollState) {
		if (scrollState == OnScrollListener.SCROLL_STATE_IDLE) {
			// 判断滚动到底部

		}
	}

	public boolean onTouchEvent(MotionEvent event) {

		if (isRefreshableHeader) {
			switch (event.getAction()) {
			case MotionEvent.ACTION_DOWN:
				if (firstItemIndex == 0 && !isRecored) {
					isRecored = true;
					startY = (int) event.getY();
					Log.v(TAG, "在down时候记录当前位置'");
				}
				break;

			case MotionEvent.ACTION_UP:

				if (state != REFRESHING && state != LOADING) {
					if (state == DONE) {
						// 什么都不做
					}
					if (state == PULL_To_REFRESH) {
						state = DONE;
						changeHeaderViewByState();

						Log.v(TAG, "由下拉刷新状态,到done状态");
					}
					if (state == RELEASE_To_REFRESH) {
						state = REFRESHING;
						
						changeHeaderViewByState();
//						recoverLine();
						onRefresh();
						
						Log.v(TAG, "由松开刷新状态,到done状态");
					}
				}

				isRecored = false;
				isBack = false;

				break;

			case MotionEvent.ACTION_MOVE:
				int tempY = (int) event.getY();
				if (!isRecored && firstItemIndex == 0) {
					Log.v(TAG, "在move时候记录下位置");
					isRecored = true;
					startY = tempY;
				}

				if (state != REFRESHING && isRecored && state != LOADING) {

					// 保证在设置padding的过程中,当前的位置一直是在head,否则如果当列表超出屏幕的话,当在上推的时候,列表会同时进行滚动

					// 可以松手去刷新了
					if (state == RELEASE_To_REFRESH) {

						setSelection(0);

						// 往上推了,推到了屏幕足够掩盖head的程度,但是还没有推到全部掩盖的地步
						if (((tempY - startY) / RATIO < headContentHeight)
								&& (tempY - startY) > 0) {
							state = PULL_To_REFRESH;
							changeHeaderViewByState();

							Log.v(TAG, "由松开刷新状态转变到下拉刷新状态");
						}
						// 一下子推到顶了
						else if (tempY - startY <= 0) {
							state = DONE;
							changeHeaderViewByState();

							Log.v(TAG, "由松开刷新状态转变到done状态");
						}
						// 往下拉了,或者还没有上推到屏幕顶部掩盖head的地步
						else {
							// 不用进行特别的操作,只用更新paddingTop的值就行了
						}
					}
					// 还没有到达显示松开刷新的时候,DONE或者是PULL_To_REFRESH状态
					if (state == PULL_To_REFRESH) {

						setSelection(0);

						// 下拉到可以进入RELEASE_TO_REFRESH的状态
						if ((tempY - startY) / RATIO >= headContentHeight) {
							state = RELEASE_To_REFRESH;
							isBack = true;
							changeHeaderViewByState();

							Log.v(TAG, "由done或者下拉刷新状态转变到松开刷新");
						}
						// 上推到顶了
						else if (tempY - startY <= 0) {
							state = DONE;
							changeHeaderViewByState();

							Log.v(TAG, "由DOne或者下拉刷新状态转变到done状态");
						}
					}

					// done状态下
					if (state == DONE) {
						if (tempY - startY > 0) {
							state = PULL_To_REFRESH;
							changeHeaderViewByState();
						}
					}

					// 更新headView的size
					if (state == PULL_To_REFRESH) {
						headView.setPadding(0, -1 * headContentHeight
								+ (tempY - startY) / RATIO, 0, 0);
					}

					// 更新headView的paddingTop
					if (state == RELEASE_To_REFRESH) {
						headView.setPadding(0, (tempY - startY) / RATIO
								- headContentHeight, 0, 0);
					}
				}

				break;
			}
		}

		return super.onTouchEvent(event);
	}

	// 当状态改变时候,调用该方法,以更新界面
	private void changeHeaderViewByState() {
		switch (state) {
		case RELEASE_To_REFRESH:
			progressBar.setVisibility(View.VISIBLE);

			Log.v(TAG, "当前状态,松开刷新");
			break;
		case PULL_To_REFRESH:
			progressBar.setVisibility(View.VISIBLE);
			// 是由RELEASE_To_REFRESH状态转变来的
			if (isBack) {
				isBack = false;

			} else {
			}
			Log.v(TAG, "当前状态,下拉刷新");
			break;

		case REFRESHING:

			headView.setPadding(0, 0, 0, 0);

			progressBar.setVisibility(View.VISIBLE);

			Log.v(TAG, "当前状态,正在刷新...");
			break;
		case DONE:
			headView.setPadding(0, -1 * headContentHeight, 0, 0);

			progressBar.setVisibility(View.GONE);
			Log.v(TAG, "当前状态,done");
			break;
		}
	}

	public void setOnRefreshListenerHead(
			OnRefreshListenerHeader refreshListenerHeader) {
		this.refreshListenerHeader = refreshListenerHeader;
		isRefreshableHeader = true;
	}


	public interface OnRefreshListenerHeader {
		public void onRefresh();
	}

	public interface OnRefreshListenerFooter {
		public void onRefresh();
	}

	public void onRefreshCompleteHeader() {
		state = DONE;
		changeHeaderViewByState();
	}

	private void onRefresh() {
		if (refreshListenerHeader != null) {
			refreshListenerHeader.onRefresh();
		}
	}

	// 此方法直接照搬自网络上的一个下拉刷新的demo,此处是"估计"headView的width以及height
	private void measureView(View child) {
		ViewGroup.LayoutParams p = child.getLayoutParams();
		if (p == null) {
			p = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
					ViewGroup.LayoutParams.WRAP_CONTENT);
		}
		int childWidthSpec = ViewGroup.getChildMeasureSpec(0, 0 + 0, p.width);
		int lpHeight = p.height;
		int childHeightSpec;
		if (lpHeight > 0) {
			childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight,
					MeasureSpec.EXACTLY);
		} else {
			childHeightSpec = MeasureSpec.makeMeasureSpec(0,
					MeasureSpec.UNSPECIFIED);
		}
		child.measure(childWidthSpec, childHeightSpec);
	}

	public void setAdapter(BaseAdapter adapter) {
		super.setAdapter(adapter);
	}
}
