/* ownCloud Android client application
 *   Copyright (C) 2011  Bartek Przybylski
 *   Copyright (C) 2012-2013 ownCloud Inc.
 *
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License version 2,
 *   as published by the Free Software Foundation.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
package com.owncloud.android.ui;

import android.content.Context;

import android.graphics.Rect;
import android.graphics.drawable.Drawable;

import android.widget.ImageView;
import android.widget.TextView;
import android.widget.LinearLayout;
import android.widget.ScrollView;

import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.view.ViewGroup;

import java.util.ArrayList;

import com.owncloud.android.R;


/**
 * Popup window, shows action list as icon and text like the one in Gallery3D
 * app.
 * 
 * @author Lorensius. W. T
 */
public class QuickAction extends CustomPopup {
    private final View root;
    private final ImageView mArrowUp;
    private final ImageView mArrowDown;
    private final LayoutInflater inflater;
    private final Context context;

    protected static final int ANIM_GROW_FROM_LEFT = 1;
    protected static final int ANIM_GROW_FROM_RIGHT = 2;
    protected static final int ANIM_GROW_FROM_CENTER = 3;
    protected static final int ANIM_REFLECT = 4;
    protected static final int ANIM_AUTO = 5;

    private int animStyle;
    private ViewGroup mTrack;
    private ScrollView scroller;
    private ArrayList<ActionItem> actionList;

    /**
     * Constructor
     * 
     * @param anchor {@link View} on where the popup window should be displayed
     */
    public QuickAction(View anchor) {
        super(anchor);

        actionList = new ArrayList<ActionItem>();
        context = anchor.getContext();
        inflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        root = (ViewGroup) inflater.inflate(R.layout.popup, null);

        mArrowDown = (ImageView) root.findViewById(R.id.arrow_down);
        mArrowUp = (ImageView) root.findViewById(R.id.arrow_up);

        setContentView(root);

        mTrack = (ViewGroup) root.findViewById(R.id.tracks);
        scroller = (ScrollView) root.findViewById(R.id.scroller);
        animStyle = ANIM_AUTO;
    }

    /**
     * Set animation style
     * 
     * @param animStyle animation style, default is set to ANIM_AUTO
     */
    public void setAnimStyle(int animStyle) {
        this.animStyle = animStyle;
    }

    /**
     * Add action item
     * 
     * @param action {@link ActionItem} object
     */
    public void addActionItem(ActionItem action) {
        actionList.add(action);
    }

    /**
     * Show popup window. Popup is automatically positioned, on top or bottom of
     * anchor view.
     * 
     */
    public void show() {
        preShow();

        int xPos, yPos;

        int[] location = new int[2];

        mAnchor.getLocationOnScreen(location);

        Rect anchorRect = new Rect(location[0], location[1], location[0]
                + mAnchor.getWidth(), location[1] + mAnchor.getHeight());

        createActionList();

        root.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
                LayoutParams.WRAP_CONTENT));
        root.measure(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);

        int rootHeight = root.getMeasuredHeight();
        int rootWidth = root.getMeasuredWidth();

        int screenWidth = mWManager.getDefaultDisplay().getWidth();
        int screenHeight = mWManager.getDefaultDisplay().getHeight();

        // automatically get X coord of popup (top left)
        if ((anchorRect.left + rootWidth) > screenWidth) {
            xPos = anchorRect.left - (rootWidth - mAnchor.getWidth());
        } else {
            if (mAnchor.getWidth() > rootWidth) {
                xPos = anchorRect.centerX() - (rootWidth / 2);
            } else {
                xPos = anchorRect.left;
            }
        }

        int dyTop = anchorRect.top;
        int dyBottom = screenHeight - anchorRect.bottom;

        boolean onTop = (dyTop > dyBottom) ? true : false;

        if (onTop) {
            if (rootHeight > dyTop) {
                yPos = 15;
                LayoutParams l = scroller.getLayoutParams();
                l.height = dyTop - mAnchor.getHeight();
            } else {
                yPos = anchorRect.top - rootHeight;
            }
        } else {
            yPos = anchorRect.bottom;

            if (rootHeight > dyBottom) {
                LayoutParams l = scroller.getLayoutParams();
                l.height = dyBottom;
            }
        }

        showArrow(((onTop) ? R.id.arrow_down : R.id.arrow_up),
                anchorRect.centerX() - xPos);

        setAnimationStyle(screenWidth, anchorRect.centerX(), onTop);

        mWindow.showAtLocation(mAnchor, Gravity.NO_GRAVITY, xPos, yPos);
    }

    /**
     * Set animation style
     * 
     * @param screenWidth screen width
     * @param requestedX distance from left edge
     * @param onTop flag to indicate where the popup should be displayed. Set
     *            TRUE if displayed on top of anchor view and vice versa
     */
    private void setAnimationStyle(int screenWidth, int requestedX,
            boolean onTop) {
        int arrowPos = requestedX - mArrowUp.getMeasuredWidth() / 2;

        switch (animStyle) {
        case ANIM_GROW_FROM_LEFT:
            mWindow.setAnimationStyle((onTop) ? R.style.Animations_PopUpMenu_Left
                    : R.style.Animations_PopDownMenu_Left);
            break;

        case ANIM_GROW_FROM_RIGHT:
            mWindow.setAnimationStyle((onTop) ? R.style.Animations_PopUpMenu_Right
                    : R.style.Animations_PopDownMenu_Right);
            break;

        case ANIM_GROW_FROM_CENTER:
            mWindow.setAnimationStyle((onTop) ? R.style.Animations_PopUpMenu_Center
                    : R.style.Animations_PopDownMenu_Center);
            break;

        case ANIM_REFLECT:
            mWindow.setAnimationStyle((onTop) ? R.style.Animations_PopUpMenu_Reflect
                    : R.style.Animations_PopDownMenu_Reflect);
            break;

        case ANIM_AUTO:
            if (arrowPos <= screenWidth / 4) {
                mWindow.setAnimationStyle((onTop) ? R.style.Animations_PopUpMenu_Left
                        : R.style.Animations_PopDownMenu_Left);
            } else if (arrowPos > screenWidth / 4
                    && arrowPos < 3 * (screenWidth / 4)) {
                mWindow.setAnimationStyle((onTop) ? R.style.Animations_PopUpMenu_Center
                        : R.style.Animations_PopDownMenu_Center);
            } else {
                mWindow.setAnimationStyle((onTop) ? R.style.Animations_PopUpMenu_Right
                        : R.style.Animations_PopDownMenu_Right);
            }

            break;
        }
    }

    /**
     * Create action list
     */
    private void createActionList() {
        View view;
        String title;
        Drawable icon;
        OnClickListener listener;

        for (int i = 0; i < actionList.size(); i++) {
            title = actionList.get(i).getTitle();
            icon = actionList.get(i).getIcon();
            listener = actionList.get(i).getOnClickListerner();

            view = getActionItem(title, icon, listener);

            view.setFocusable(true);
            view.setClickable(true);

            mTrack.addView(view);
        }
    }

    /**
     * Get action item {@link View}
     * 
     * @param title action item title
     * @param icon {@link Drawable} action item icon
     * @param listener {@link View.OnClickListener} action item listener
     * @return action item {@link View}
     */
    private View getActionItem(String title, Drawable icon,
            OnClickListener listener) {
        LinearLayout container = (LinearLayout) inflater.inflate(
                R.layout.action_item, null);

        ImageView img = (ImageView) container.findViewById(R.id.icon);
        TextView text = (TextView) container.findViewById(R.id.title);

        if (icon != null) {
            img.setImageDrawable(icon);
        }

        if (title != null) {
            text.setText(title);
        }

        if (listener != null) {
            container.setOnClickListener(listener);
        }

        return container;
    }

    /**
     * Show arrow
     * 
     * @param whichArrow arrow type resource id
     * @param requestedX distance from left screen
     */
    private void showArrow(int whichArrow, int requestedX) {
        final View showArrow = (whichArrow == R.id.arrow_up) ? mArrowUp
                : mArrowDown;
        final View hideArrow = (whichArrow == R.id.arrow_up) ? mArrowDown
                : mArrowUp;

        final int arrowWidth = mArrowUp.getMeasuredWidth();

        showArrow.setVisibility(View.VISIBLE);

        ViewGroup.MarginLayoutParams param = (ViewGroup.MarginLayoutParams) showArrow
                .getLayoutParams();

        param.leftMargin = requestedX - arrowWidth / 2;

        hideArrow.setVisibility(View.INVISIBLE);
    }
}