/*
 *  The Mana Client
 *  Copyright (C) 2004-2009  The Mana World Development Team
 *  Copyright (C) 2009-2012  The Mana Developers
 *  Copyright (C) 2009  Aethyra Development Team
 *
 *  This file is part of The Mana Client.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  any later version.
 *
 *  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/>.
 */

#ifndef BROWSERBOX_H
#define BROWSERBOX_H

#include <guichan/mouselistener.hpp>
#include <guichan/widget.hpp>

#include <deque>
#include <optional>
#include <vector>

class LinkHandler;
struct LayoutContext;

struct BrowserLink
{
    int x1 = 0, x2 = 0, y1 = 0, y2 = 0;     /**< Where link is placed */
    std::string link;
    std::string caption;

    bool contains(int x, int y) const
    {
        return x >= x1 && x < x2 && y >= y1 && y < y2;
    }
};

struct LinePart
{
    int x;
    int y;
    gcn::Color color;
    std::string text;
    gcn::Font *font;
};

struct TextRow
{
    std::string text;
    std::vector<LinePart> parts;
    std::vector<BrowserLink> links;
    int width = 0;
    int height = 0;
};

/**
 * A simple browser box able to handle links and forward events to the
 * parent conteiner.
 */
class BrowserBox : public gcn::Widget,
                   public gcn::MouseListener
{
    public:
        BrowserBox(unsigned int mode = AUTO_SIZE);
        ~BrowserBox() override;

        /**
         * Sets the handler for links.
         */
        void setLinkHandler(LinkHandler *handler) { mLinkHandler = handler; }

        /**
         * Sets the Highlight mode for links.
         */
        void setHighlightMode(unsigned int mode) { mHighlightMode = mode; }

        /**
         * Sets whether the font will use a shadow for text.
         */
        void setShadowedText(bool shadows) { mShadows = shadows; }

        /**
         * Sets whether the font will use a shadow for text.
         */
        void setOutlinedText(bool outline) { mOutline = outline; }

        /**
         * Sets the maximum numbers of rows in the browser box. 0 = no limit.
         */
        void setMaxRows(unsigned maxRows) { mMaxRows = maxRows; }

        /**
         * Disable links & user defined colors to be used in chat input.
         */
        void disableLinksAndUserColors() { mUseLinksAndUserColors = false; }

        /**
         * Adds a text row to the browser.
         */
        void addRow(const std::string &row);

        /**
         * Remove all rows.
         */
        void clearRows();

        /**
         * Handles mouse actions.
         */
        void mousePressed(gcn::MouseEvent &event) override;
        void mouseMoved(gcn::MouseEvent &event) override;
        void mouseExited(gcn::MouseEvent &event) override;

        /**
         * Draws the browser box.
         */
        void draw(gcn::Graphics *graphics) override;

        void maybeRelayoutText();

        /**
         * BrowserBox modes.
         */
        enum
        {
            AUTO_SIZE,
            AUTO_WRAP       /**< Maybe it needs a fix or to be redone. */
        };

        /**
         * BrowserBox colors.
         *
         * NOTES (by Javila):
         *  - color values is "0x" prefix followed by HTML color style.
         *  - we can add up to 10 different colors: [0..9].
         *  - not all colors will be fine with all backgrounds due transparent
         *    windows and widgets. So, I think it's better keep BrowserBox
         *    opaque (white background) by default.
         */
        enum
        {
            RED = 0xff0000,         /**< Color 1 */
            GREEN = 0x009000,       /**< Color 2 */
            BLUE = 0x0000ff,        /**< Color 3 */
            ORANGE = 0xe0980e,      /**< Color 4 */
            YELLOW = 0xf1dc27,      /**< Color 5 */
            PINK = 0xff00d8,        /**< Color 6 */
            PURPLE = 0x8415e2,      /**< Color 7 */
            GRAY = 0x919191,        /**< Color 8 */
            BROWN = 0x8e4c17        /**< Color 9 */
        };

        /**
         * Highlight modes for links.
         * This can be used for a bitmask.
         */
        enum
        {
            UNDERLINE  = 1,
            BACKGROUND = 2
        };

    private:
        void relayoutText();
        void layoutTextRow(TextRow &row, LayoutContext &context);
        void updateHoveredLink(int x, int y);

        std::deque<TextRow> mTextRows;

        LinkHandler *mLinkHandler = nullptr;
        unsigned int mMode;
        unsigned int mHighlightMode = UNDERLINE | BACKGROUND;
        bool mShadows = false;
        bool mOutline = false;
        bool mUseLinksAndUserColors = true;
        std::optional<BrowserLink> mHoveredLink;
        unsigned int mMaxRows = 0;
        int mLastLayoutWidth = 0;
        int mLastLayoutTime = -1;
};

#endif