/*      _______   __   __   __   ______   __   __   _______   __   __
 *     / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___  /\ /  |\/ /\
 *    / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /
 *   / / /__   / / // / // / // / /    / ___  / // ___  / // /| ' / /
 *  / /_// /\ / /_// / // / // /_/_   / / // / // /\_/ / // / |  / /
 * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /
 * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/
 *
 * Copyright (c) 2004, 2005, 2006, 2007 Olof Naessén and Per Larsson
 *
 *                                                         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@\
 *    this list of conditions and the           j(]1u<sE"L,. .   ./^ ]{a
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 * 2. Redistributions in binary form must        )_]X{Z('a_"a7'<a"a,  ]"[
 *    reproduce the above copyright notice,       #}<]m7`Za??4,P-"'7. ).m
 *    this list of conditions and the            ]d2e)Q(<Q(  ?94   b-  LQ/
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 *    documentation and/or other materials      .Z!=J ]e []('-4f _ ) -.)m]'
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 *    names of its contributors may be used     =3)= _f  (_yQmWW$#(    "
 *    to endorse or promote products derived     -   W,  sQQQQmZQ#Wwa]..
 *    from this software without specific        (js, \[QQW$QWW#?!V"".
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT       )/ )/           !
 * HOLDERS AND CONTRIBUTORS "AS IS" AND ANY         <  (; sac    ,    '
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * 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 "guisan/widgets/textfield.hpp"

#include "guisan/font.hpp"
#include "guisan/graphics.hpp"
#include "guisan/key.hpp"
#include "guisan/mouseinput.hpp"
#include "guisan/text.hpp"

namespace gcn
{
    TextField::TextField() : mText(std::make_unique<Text>())
    {
        setFocusable(true);

        addMouseListener(this);
        addKeyListener(this);

        adjustHeight();
    }

    TextField::TextField(const std::string& text) : mText(std::make_unique<Text>(text))
    {
        setFocusable(true);

        addMouseListener(this);
        addKeyListener(this);

        adjustSize();
    }

    TextField::~TextField() = default;

    void TextField::setText(const std::string& text)
    {
        mText->setRow(0, text);
    }

    void TextField::draw(Graphics* graphics)
    {
        Color faceColor = getBaseColor();
        Color highlightColor, shadowColor;
        int alpha = getBaseColor().a;
        highlightColor = faceColor + 0x303030;
        highlightColor.a = alpha;
        shadowColor = faceColor - 0x303030;
        shadowColor.a = alpha;

        // Draw a border.
        graphics->setColor(shadowColor);
        graphics->drawLine(0, 0, getWidth() - 1, 0);
        graphics->drawLine(0, 1, 0, getHeight() - 2);
        graphics->setColor(highlightColor);
        graphics->drawLine(getWidth() - 1, 1, getWidth() - 1, getHeight() - 1);
        graphics->drawLine(0, getHeight() - 1, getWidth() - 1, getHeight() - 1);

        // Push a clip area so the other drawings don't need to worry
        // about the border.
        graphics->pushClipArea(Rectangle(1, 1, getWidth() - 2, getHeight() - 2));

        graphics->setColor(getBackgroundColor());
        graphics->fillRectangle(Rectangle(0, 0, getWidth(), getHeight()));

        if (isFocused())
        {
            graphics->setColor(getSelectionColor());
            graphics->drawRectangle(Rectangle(0, 0, getWidth() - 2, getHeight() - 2));
            graphics->drawRectangle(Rectangle(1, 1, getWidth() - 4, getHeight() - 4));
        }

        if (isFocused() && isEditable())
        {
            drawCaret(graphics, mText->getCaretX(getFont()) - mXScroll);
        }

        if (isEnabled())
            graphics->setColor(getForegroundColor());
        else
            graphics->setColor(Color(128, 128, 128));

        graphics->setFont(getFont());

        if (mText->getNumberOfRows() != 0) 
            graphics->drawText(mText->getRow(0), 2 - mXScroll, 2, Graphics::Left, isEnabled());

        graphics->popClipArea();
    }

    void TextField::drawCaret(Graphics* graphics, int x)
    {
        // Check the current clip area as a clip area with a different
        // size than the widget might have been pushed (which is the
        // case in the draw method when we push a clip area after we have
        // drawn a border).
        const Rectangle clipArea = graphics->getCurrentClipArea();

        graphics->setColor(getForegroundColor());
        graphics->drawLine(x, clipArea.height - 2, x, 1);
    }

    void TextField::mousePressed(MouseEvent& mouseEvent)
    {
        if (mouseEvent.getButton() == MouseEvent::Left)
        {
            mText->setCaretPosition(mouseEvent.getX(), mouseEvent.getY(), getFont());
            fixScroll();
        }
    }

    void TextField::mouseDragged(MouseEvent& mouseEvent)
    {
        mouseEvent.consume();
    }

    void TextField::keyPressed(KeyEvent& keyEvent)
    {
        Key key = keyEvent.getKey();

        if (key.getValue() == Key::Left)
        {
            mText->setCaretPosition(mText->getCaretPosition() - 1);
        }

        else if (key.getValue() == Key::Right)
        {
            mText->setCaretPosition(mText->getCaretPosition() + 1);
        }

        else if (key.getValue() == Key::Delete && mEditable)
        {
            mText->remove(1);
        }

        else if (key.getValue() == Key::Backspace && mEditable)
        {
            mText->remove(-1);
        }

        else if (key.getValue() == Key::Enter)
        {
            distributeActionEvent();
        }

        else if (key.getValue() == Key::Home)
        {
            mText->setCaretColumn(0);
        }

        else if (key.getValue() == Key::End)
        {
            mText->setCaretColumn(mText->getNumberOfCharacters(0));
        }

        else if (key.isCharacter() && key.getValue() != Key::Tab && !keyEvent.isAltPressed()
                 && !keyEvent.isControlPressed() && mEditable)
        {
            if (keyEvent.isShiftPressed() && key.isLetter())
            {
                mText->insert(key.getValue() - 32);
            }
            else
            {
                mText->insert(key.getValue());
            }
        }

        if (key.getValue() != Key::Tab)
        {
            keyEvent.consume();
        }

        fixScroll();
    }

    void TextField::adjustSize()
    {
        const Rectangle& dim = mText->getDimension(getFont());
        setWidth(dim.width + 8);
        adjustHeight();

        fixScroll();
    }

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

    void TextField::fixScroll()
    {
        if (isFocused())
        {
            int caretX = mText->getCaretDimension(getFont()).x;

            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)
    {
        mText->setCaretPosition(position);
    }

    unsigned int TextField::getCaretPosition() const
    {
        return mText->getCaretPosition();
    }

    std::string TextField::getText() const
    {
        return mText->getContent();
    }

    void TextField::fontChanged()
    {
        fixScroll();
    }
}
