/*      _______   __   __   __   ______   __   __   _______   __   __                 
 *     / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___  /\ /  |\/ /\                
 *    / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /                 
 *   / / /__   / / // / // / // / /    / ___  / // ___  / // /| ' / /                  
 *  / /_// /\ / /_// / // / // /_/_   / / // / // /\_/ / // / |  / /                   
 * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /                    
 * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/                      
 *
 * Copyright (c) 2004, 2005 darkbits                        Js_./
 * Per Larsson a.k.a finalman                          _RqZ{a<^_aa
 * Olof Naessén a.k.a jansem/yakslem                _asww7!uY`>  )\a//
 *                                                 _Qhm`] _f "'c  1!5m
 * Visit: http://guichan.darkbits.org             )Qk<P ` _: :+' .'  "{[
 *                                               .)j(] .d_/ '-(  P .   S
 * License: (BSD)                                <Td/Z <fP"5(\"??"\a.  .L
 * Redistribution and use in source and          _dV>ws?a-?'      ._/L  #'
 * binary forms, with or without                 )4d[#7r, .   '     )d`)[
 * modification, are permitted provided         _Q-5'5W..j/?'   -?!\)cam'
 * that the following conditions are met:       j<<WP+k/);.        _W=j f
 * 1. Redistributions of source code must       .$%w\/]Q  . ."'  .  mj$
 *    retain the above copyright notice,        ]E.pYY(Q]>.   a     J@\
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 *    documentation and/or other materials      .Z!=J ]e []('-4f _ ) -.)m]'
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 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * For comments regarding functions please see the header file. 
 */

#include "guichan/keyinput.h"
#include "guichan/mouseinput.h"
#include "guichan/widgets/textfield.h"
#include "guichan/exception.h"
#include "util.h"

namespace gcn
{
    TextField::TextField()
    {
        mCaretPosition = 0;
        mXScroll = 0;

        setFocusable(true);

        addMouseListener(this);
        addKeyListener(this);
        adjustHeight();
        setBorderSize(1);    
    }
  
    TextField::TextField(const std::string& text)
    {
        mCaretPosition = 0;
        mXScroll = 0;
    
        mText = text;
        adjustSize();
        setBorderSize(1);
        
        setFocusable(true);    
  
        addMouseListener(this);
        addKeyListener(this);    
    }

    void TextField::setText(const std::string& text)
    {
        if ((int)text.size() < mCaretPosition )
        {
            mCaretPosition = text.size();
        }
    
        mText = text;    
    }
  
    void TextField::draw(Graphics* graphics)
    {
        Color faceColor = getBackgroundColor();
        graphics->setColor(faceColor);
        graphics->fillRectangle(Rectangle(0, 0, getWidth(), getHeight()));
    
        if (hasFocus())
        {      
            drawCaret(graphics, getFont()->getWidth(mText.substr(0, mCaretPosition)) - mXScroll);
        }
    
        graphics->setColor(getForegroundColor());
        graphics->setFont(getFont());
        graphics->drawText(mText, 1 - mXScroll, 1);    
    }

    void TextField::drawBorder(Graphics* graphics)
    {
        Color faceColor = getBaseColor();
        Color highlightColor, shadowColor;
        int alpha = getBaseColor().a;
        int width = getWidth() + getBorderSize() * 2 - 1;
        int height = getHeight() + getBorderSize() * 2 - 1;
        highlightColor = faceColor + 0x303030;
        highlightColor.a = alpha;
        shadowColor = faceColor - 0x303030;
        shadowColor.a = alpha;
        
        unsigned int i;
        for (i = 0; i < getBorderSize(); ++i)
        {
            graphics->setColor(shadowColor);
            graphics->drawLine(i,i, width - i, i);
            graphics->drawLine(i,i + 1, i, height - i - 1);
            graphics->setColor(highlightColor);
            graphics->drawLine(width - i,i + 1, width - i, height - i); 
            graphics->drawLine(i,height - i, width - i - 1, height - i);
        }
    }
    
    void TextField::drawCaret(Graphics* graphics, int x)
    {
        graphics->setColor(getForegroundColor());
        graphics->drawLine(x, getHeight() - 2, x, 1);    
    }
  
    void TextField::mousePress(int x, int y, int button)
    {
        if (hasMouse() && button == MouseInput::LEFT)
        {
            mCaretPosition = getFont()->getStringIndexAt(mText, x + mXScroll);
            fixScroll();
        }
        else if (hasMouse() && button == MouseInput::MIDDLE)
        {
            std::string str;
            if (GetClipboard(str) >= 0) {
                for (size_t i = 0; i < str.size(); ++i) {
                    keyPress(Key(str[i]));
                }
            }
        }
    }

    bool TextField::keyPress(const Key& key)
    {
        bool ret = false;

        if (key.getValue() == Key::LEFT && mCaretPosition > 0)
        {
            mCaretPosition = UTF8GetPrev(mText, mCaretPosition);
            if (mCaretPosition < 0) {
                throw GCN_EXCEPTION("Invalid UTF8.");
            }
            ret = true;
        }

        else if (key.getValue() == Key::RIGHT && mCaretPosition < (int)mText.size())
        {
            mCaretPosition = UTF8GetNext(mText, mCaretPosition);
            if (mCaretPosition > (int)mText.size()) {
                throw GCN_EXCEPTION("Invalid UTF8.");
            }
            ret = true;
        }

        else if (key.getValue() == Key::DELETE && mCaretPosition < (int)mText.size())
        {
			int newpos = UTF8GetNext(mText, mCaretPosition);
            if (mCaretPosition > (int)mText.size()) {
                throw GCN_EXCEPTION("Invalid UTF8.");
            }
            mText.erase(mCaretPosition, newpos - mCaretPosition);
            ret = true;
        }

        else if ((key.getValue() == Key::BACKSPACE || key.getValue() == 'h' - 'a' + 1) &&
            mCaretPosition > 0)
        {
            int newpos = UTF8GetPrev(mText, mCaretPosition);
            if (mCaretPosition < 0) {
                throw GCN_EXCEPTION("Invalid UTF8.");
            }
            mText.erase(newpos, mCaretPosition - newpos);
			mCaretPosition = newpos;
            ret = true;
        }

        else if (key.getValue() == Key::ENTER)
        {
            generateAction();
            ret = true;
        }

        else if (key.getValue() == Key::HOME || key.getValue() == 'a' - 'a' + 1) // ctrl-a
        {
            mCaretPosition = 0;
            ret = true;
        }    

        else if (key.getValue() == Key::END || key.getValue() == 'e' - 'a' + 1)  //ctrl-e
        {
            mCaretPosition = mText.size();
            ret = true;
        }    

        else if (key.getValue() == 'u' - 'a' + 1) // ctrl-u
        {
            setText("");
            ret = true;
        }

        else if (key.getValue() == 'v' - 'a' + 1) // ctrl-v
        {
            std::string str;
            if (GetClipboard(str) >= 0) {
                for (size_t i = 0; i < str.size(); ++i) {
                    keyPress(Key(str[i]));
                }
                ret = true;
            }
        }

        else if (key.isCharacter())
        {
            mText.insert(mCaretPosition,key.toString());
            mCaretPosition = UTF8GetNext(mText, mCaretPosition);
            if (mCaretPosition > (int)mText.size()) {
                throw GCN_EXCEPTION("Invalid UTF8.");
            }
            ret = true;
        }

        fixScroll();
        return ret;
    }

    void TextField::adjustSize()
    {
        setWidth(getFont()->getWidth(mText) + 4);
        adjustHeight();

        fixScroll();    
    }
  
    void TextField::adjustHeight()
    {
        setHeight(getFont()->getHeight() + 2);    
    }

    void TextField::fixScroll()
    {
        if (hasFocus())
        {
            int caretX = getFont()->getWidth(mText.substr(0, mCaretPosition));

            if (caretX - mXScroll > getWidth() - 4)
            {
                mXScroll = caretX - getWidth() + 4;
            }
            else if (caretX - mXScroll < getFont()->getWidth(" "))
            {
                mXScroll = caretX - getFont()->getWidth(" ");
        
                if (mXScroll < 0)
                {
                    mXScroll = 0;
                }
            }
        }
    }

    void TextField::setCaretPosition(unsigned int position)
    {
        if (position > mText.size())
        {
            mCaretPosition = mText.size();
        }
        else
        {    
            mCaretPosition = position;
        }

        fixScroll();    
    }

    unsigned int TextField::getCaretPosition() const
    {
        return mCaretPosition;    
    }

    const std::string& TextField::getText() const
    {
        return mText;    
    }
  
    void TextField::fontChanged()
    {
        fixScroll();
    }
}