/*      _______   __   __   __   ______   __   __   _______   __   __
 *     / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___  /\ /  |\/ /\
 *    / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /
 *   / / /__   / / // / // / // / /    / ___  / // ___  / // /| ' / /
 *  / /_// /\ / /_// / // / // /_/_   / / // / // /\_/ / // / |  / /
 * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /
 * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/
 *
 * 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@\
 *    this list of conditions and the           j(]1u<sE"L,. .   ./^ ]{a
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 *    documentation and/or other materials      .Z!=J ]e []('-4f _ ) -.)m]'
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT       )/ )/           !
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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 "stratagus.h"

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

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

        setFocusable(true);

        addMouseListener(this);
        addKeyListener(this);
        adjustHeight();
        setBorderSize(1);
    }

    TextField::TextField(const std::string& text)
    {
        mCaretPosition = 0;
        mXScroll = 0;
		mSelectStart = 0;
		mSelectEndOffset = 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, std::vector<std::function<void(renderer *)>> &render_commands)
    {
		Font *font;
		int x, y;
        Color faceColor = getBackgroundColor();
        graphics->setColor(faceColor);
        graphics->fillRectangle(Rectangle(0, 0, getWidth(), getHeight()), render_commands);

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

        graphics->setColor(getForegroundColor());
		font = getFont();
        graphics->setFont(font);

		x = 1 - mXScroll;
		y = 1;

		if (mSelectEndOffset != 0)
		{
			unsigned int first;
			unsigned int len;
			int selX;
			int selW;
			std::string tmpStr;

			getTextSelectionPositions(&first, &len);

			tmpStr = std::string(mText.substr(0, first));
			selX = font->getWidth(tmpStr);

			tmpStr = std::string(mText.substr(first, len));
			selW = font->getWidth(tmpStr);

			graphics->setColor(Color(127, 127, 127));
			graphics->fillRectangle(Rectangle(x + selX, y, selW, font->getHeight()), render_commands);
		}

        graphics->drawText(mText, x, y, render_commands);
    }

    void TextField::drawBorder(Graphics* graphics, std::vector<std::function<void(renderer *)>> &render_commands)
    {
        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, render_commands);
            graphics->drawLine(i,i + 1, i, height - i - 1, render_commands);
            graphics->setColor(highlightColor);
            graphics->drawLine(width - i,i + 1, width - i, height - i, render_commands);
            graphics->drawLine(i,height - i, width - i - 1, height - i, render_commands);
        }
    }

    void TextField::drawCaret(Graphics* graphics, int x, std::vector<std::function<void(renderer *)>> &render_commands)
    {
        graphics->setColor(getForegroundColor());
        graphics->drawLine(x, getHeight() - 2, x, 1, render_commands);
    }

    void TextField::mousePress(int x, int, int button)
    {
        if (hasMouse() && button == MouseInput::LEFT)
        {
            mCaretPosition = getFont()->getStringIndexAt(mText, x + mXScroll);
			mSelectStart = mCaretPosition;
			mSelectEndOffset = 0;
            fixScroll();
        }
    }

	void TextField::mouseMotion(int x, int)
	{
		if (isDragged() && mClickButton == MouseInput::LEFT)
		{
			mCaretPosition = getFont()->getStringIndexAt(mText, x + mXScroll);
			mSelectEndOffset = mCaretPosition - mSelectStart;
			setDirty(true);
		}
	}

    bool TextField::keyPress(const Key& key)
    {
        bool ret = false;
        unsigned int selFirst;
        unsigned int selLen;

        getTextSelectionPositions(&selFirst, &selLen);

        if (key.getValue() == Key::K_LEFT)
        {
            if (mCaretPosition > 0) {
                mCaretPosition = UTF8GetPrev(mText, mCaretPosition);
                if (mCaretPosition < 0) {
                    throw std::runtime_error("Invalid UTF8.");
                }

                if (key.isShiftPressed()) {
                    --mSelectEndOffset;
                } else {
                    mSelectStart = mCaretPosition;
                    mSelectEndOffset = 0;
                }
            } else if (!key.isShiftPressed()) {
                mSelectStart = mCaretPosition;
                mSelectEndOffset = 0;
            }
            ret = true;
        }

        else if (key.getValue() == Key::K_RIGHT)
        {
            if (mCaretPosition < (int)mText.size()) {
                mCaretPosition = UTF8GetNext(mText, mCaretPosition);
                if (mCaretPosition > (int)mText.size()) {
                    throw std::runtime_error("Invalid UTF8.");
                }

                if (key.isShiftPressed()) {
                    ++mSelectEndOffset;
                } else {
                    mSelectStart = mCaretPosition;
                    mSelectEndOffset = 0;
                }
            } else if (!key.isShiftPressed()) {
                mSelectStart = mCaretPosition;
                mSelectEndOffset = 0;
            }

            ret = true;
        }

        else if (key.getValue() == Key::K_DELETE)
        {
			if (selLen > 0) {
				mText.erase(selFirst, selLen);
				mCaretPosition = selFirst;
				mSelectStart = selFirst;
				mSelectEndOffset = 0;
			} else if (mCaretPosition < (int)mText.size()) {
				int newpos = UTF8GetNext(mText, mCaretPosition);
				if (mCaretPosition > (int)mText.size()) {
                    throw std::runtime_error("Invalid UTF8.");
				}
				mText.erase(mCaretPosition, newpos - mCaretPosition);
				ret = true;
			}
        }

        else if (key.getValue() == Key::K_BACKSPACE || key.getValue() == 'h' - 'a' + 1)
        {
			if (selLen > 0) {
				mText.erase(selFirst, selLen);
				mCaretPosition = selFirst;
				mSelectStart = selFirst;
				mSelectEndOffset = 0;
			} else if (mCaretPosition > 0) {
				int newpos = UTF8GetPrev(mText, mCaretPosition);
				if (mCaretPosition < 0) {
                    throw std::runtime_error("Invalid UTF8.");
				}
				mText.erase(newpos, mCaretPosition - newpos);
				mCaretPosition = newpos;
				ret = true;
			}
        }

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

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

        else if (key.getValue() == Key::K_END || key.getValue() == 'e' - 'a' + 1)  //ctrl-e
        {
			if (key.isShiftPressed()) {
				mSelectEndOffset += mText.size() - mCaretPosition;
			} else {
				mSelectStart = mText.size();
				mSelectEndOffset = 0;
			}
			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 (selLen > 0) {
				mText.erase(selFirst, selLen);
				mCaretPosition = selFirst;
				mSelectStart = selFirst;
				mSelectEndOffset = 0;
			}
        }

        else if (key.isCharacter())
        {
            if (selLen > 0) {
                mText.erase(selFirst, selLen);
                mCaretPosition = selFirst;
                mSelectStart = selFirst;
                mSelectEndOffset = 0;
            }

            mText.insert(mCaretPosition,key.toString());
            mCaretPosition = UTF8GetNext(mText, mCaretPosition);
            if (mCaretPosition > (int)mText.size()) {
                throw std::runtime_error("Invalid UTF8.");
            }
			mSelectStart = mCaretPosition;
			mSelectEndOffset = 0;
            ret = true;
        }

        fixScroll();
        setDirty(true);
        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;
    }

	void TextField::getTextSelectionPositions(unsigned int* first, unsigned int* len)
	{
		if (mSelectEndOffset < 0)
		{
			*first = mSelectStart + mSelectEndOffset;
			*len = -mSelectEndOffset;
		}
		else
		{
			*first = mSelectStart;
			*len = mSelectEndOffset;
		}
	}

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

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