#pragma once

#include <Gosu/Fwd.hpp>
#include <Gosu/Color.hpp>
#include <Gosu/GraphicsBase.hpp>
#include <memory>
#include <string>
#include <vector>

namespace Gosu
{
    /// Provides functionality for drawing rectangular images.
    class Image
    {
        std::shared_ptr<ImageData> m_data;

    public:
        /// Creates an empty image. It will have a width and height of 0, and not contain anything.
        Image();

        /// Loads an image from a given filename.
        ///
        /// A color key of #ff00ff is automatically applied to BMP image files.
        /// For more flexibility, use the corresponding constructor that uses a Bitmap object.
        explicit Image(const std::string& filename, unsigned image_flags = IF_SMOOTH);

        //! Loads a portion of the the image at the given filename..
        ///
        /// A color key of #ff00ff is automatically applied to BMP image files.
        /// For more flexibility, use the corresponding constructor that uses a Bitmap object.
        Image(const std::string& filename, int src_x, int src_y, int src_width, int src_height,
              unsigned image_flags = IF_SMOOTH);

        /// Converts the given bitmap into an image.
        explicit Image(const Bitmap& source, unsigned image_flags = IF_SMOOTH);

        /// Converts a portion of the given bitmap into an image.
        Image(const Bitmap& source, int src_x, int src_y, int src_width, int src_height,
              unsigned image_flags = IF_SMOOTH);

        /// Creates an Image from a user-supplied instance of the ImageData interface.
        explicit Image(std::unique_ptr<ImageData>&& data);

        unsigned width() const;
        unsigned height() const;

        /// Draws the image so its upper left corner is at (x; y).
        void draw(double x, double y, ZPos z = 0, double scale_x = 1, double scale_y = 1,
                  Color c = Color::WHITE, BlendMode mode = BM_DEFAULT) const;
        /// Like draw(), but with modulation colors for all four corners.
        void draw_mod(double x, double y, ZPos z, double scale_x, double scale_y, Color c1,
                      Color c2, Color c3, Color c4, BlendMode mode = BM_DEFAULT) const;

        /// Draws the image rotated by the given angle so that its rotation center is at (x; y).
        /// Note that this is different from how all the other drawing functions work!
        /// @param angle See Math.hpp for an explanation of how Gosu interprets angles.
        /// @param center_x Relative horizontal position of the rotation center on the image.
        /// 0 is the left border, 1 is the right border, 0.5 is the center (and default).
        /// @param center_y See center_x.
        void draw_rot(double x, double y, ZPos z = 0, double angle = 0, double center_x = 0.5,
                      double center_y = 0.5, double scale_x = 1, double scale_y = 1,
                      Color c = Color::WHITE, BlendMode mode = BM_DEFAULT) const;

#ifndef SWIG
        /// Provides access to the underlying image data object.
        ImageData& data() const;
#endif
    };

#ifndef SWIG
    /// Convenience function that slices an image file into a grid and creates images from them.
    /// @param tile_width If positive, specifies the width of one tile in pixels.
    /// If negative, the bitmap is divided into -tile_width rows.
    /// @param tile_height See tile_width.
    std::vector<Gosu::Image> load_tiles(const Bitmap& bmp, int tile_width, int tile_height,
                                        unsigned image_flags = IF_SMOOTH);

    /// Convenience function that slices a bitmap into a grid and creates images from them.
    /// @param tile_width If positive, specifies the width of one tile in pixels.
    /// If negative, the bitmap is divided into -tile_width rows.
    /// @param tile_height See tile_width.
    std::vector<Gosu::Image> load_tiles(const std::string& filename, int tile_width,
                                        int tile_height, unsigned image_flags = IF_SMOOTH);
#endif
}