/*      _______   __   __   __   ______   __   __   _______   __   __
 *     / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___  /\ /  |\/ /\
 *    / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /
 *   / / /__   / / // / // / // / /    / ___  / // ___  / // /| ' / /
 *  / /_// /\ / /_// / // / // /_/_   / / // / // /\_/ / // / |  / /
 * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /
 * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/
 *
 * 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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 * 3. Neither the name of Guichan nor the      :$we` _! + _/ .        j?
 *    names of its contributors may be used     =3)= _f  (_yQmWW$#(    "
 *    to endorse or promote products derived     -   W,  sQQQQmZQ#Wwa]..
 *    from this software without specific        (js, \[QQW$QWW#?!V"".
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 *                                                 -]n w/ '         [.
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT       )/ )/           !
 * HOLDERS AND CONTRIBUTORS "AS IS" AND ANY         <  (; sac    ,    '
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 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR        _bQf` y`..)a
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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES               _Pa,)!f/<[]/  ?"
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION)                     ^
 * 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"

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 (text.size() < mCaretPosition)
		{
			mCaretPosition = text.size();
		}

		mText = text;
	}

	void TextField::draw(Graphics* graphics)
	{
		const Color faceColor = getBackgroundColor();
		graphics->setColor(faceColor);
		graphics->fillRectangle(Rectangle(0, 0, getWidth(), getHeight()));

		if (isFocused())
		{
			drawCaret(graphics, getFont()->getWidth(mText.substr(0, mCaretPosition)) - mXScroll);
		}

		if (isEnabled())
			graphics->setColor(getForegroundColor());
		else
			graphics->setColor(Color(128, 128, 128));
		
		graphics->setFont(getFont());
		graphics->drawText(mText, 1 - mXScroll, 2, Graphics::LEFT, isEnabled());
	}

	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::mousePressed(MouseEvent& mouseEvent)
	{
		if (mouseEvent.getButton() == MouseEvent::LEFT)
		{
			mCaretPosition = getFont()->getStringIndexAt(mText, mouseEvent.getX() + mXScroll);
			fixScroll();
		}
	}

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

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

		if (key.getValue() == Key::LEFT && mCaretPosition > 0)
		{
			--mCaretPosition;
		}

		else if (key.getValue() == Key::RIGHT && mCaretPosition < mText.size())
		{
			++mCaretPosition;
		}

		else if (key.getValue() == Key::DELETE && mCaretPosition < mText.size())
		{
			mText.erase(mCaretPosition, 1);
		}

		else if (key.getValue() == Key::BACKSPACE && mCaretPosition > 0)
		{
			mText.erase(mCaretPosition - 1, 1);
			--mCaretPosition;
		}

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

		else if (key.getValue() == Key::HOME)
		{
			mCaretPosition = 0;
		}

		else if (key.getValue() == Key::END)
		{
			mCaretPosition = mText.size();
		}

		else if (key.isCharacter() && key.getValue() != Key::TAB && !keyEvent.isAltPressed()
			&& !keyEvent.isControlPressed())
		{
			if (keyEvent.isShiftPressed() && key.isLetter())
			{
				mText.insert(mCaretPosition, std::string(1, static_cast<char>(key.getValue() - 32)));
			}
			else
			{
				mText.insert(mCaretPosition, std::string(1, static_cast<char>(key.getValue())));
			}
			++mCaretPosition;
		}

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

		fixScroll();
	}

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

		fixScroll();
	}

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

	void TextField::fixScroll()
	{
		if (isFocused())
		{
			const 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();
	}
}
