#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <Frame.h>
#include <Face.h>
#include <set>

/** @brief Plot the face metrics using opencv highgui
 */
class Visualizer
{
public:

  Visualizer();

  /** @brief UpdateImage refreshes the image that will be update
  * @param output_img  -- The image to display output on
  */
  void updateImage(cv::Mat output_img);

  /** @brief DrawPoints displays the landmark points on the image
  * @param points  -- The landmark points
  */
  void drawPoints(affdex::VecFeaturePoint points);

  /** @brief DrawBoundingBox displays the bounding box
  * @param top_left      -- The top left point
  * @param bottom_right  -- The bottom right point
  * @param valence       -- The valence value
  */
  void drawBoundingBox(cv::Point2f top_left, cv::Point2f bottom_right, float valence);

  /** @brief DrawHeadOrientation Displays head orientation and associated value
  * @param name        -- Name of the classifier
  * @param value       -- Value we are trying to display
  * @param x           -- The x value of the location
  * @param padding     -- The padding value
  * @param align_right -- Whether to right or left justify the text
  * @param color       -- Color
  */
  void drawHeadOrientation(affdex::Orientation headAngles, const int x, int &padding,
                           bool align_right=true, cv::Scalar color=cv::Scalar(255,255,255));

  /** @brief DrawAppearance Draws appearance metrics on screen
  * @param appearance  -- affdex::Appearance metrics
  * @param value       -- Value we are trying to display
  * @param x           -- The x value of the location
  * @param padding     -- The padding value
  * @param align_right -- Whether to right or left justify the text
  * @param color       -- Color
  */
  void drawAppearance(affdex::Appearance appearance, const int x, int &padding,
                      bool align_right=true, cv::Scalar color=cv::Scalar(255,255,255));


  /** @brief DrawFaceMetrics Displays all facial metrics and associated value
  * @param face         -- The affdex::Face object to display
  * @param bounding_box -- The bounding box coordinates
  */
  void drawFaceMetrics(affdex::Face face, std::vector<cv::Point2f> bounding_box);

  /** @brief ShowImage displays image on screen
  */
  void showImage();

  /**
   * Overlay an image with an Alpha (foreground) channel over background
   * Assumes foreground.size() == background.size()
   * Adapted from : http://jepsonsblog.blogspot.com/2012/10/overlay-transparent-image-in-opencv.html
   * @param foreground - image to overlay
   * @param background - ROI to overlay on
   */
  void overlayImage(const cv::Mat &foreground, cv::Mat &background, cv::Point2i location);


  std::set<std::string> GREEN_COLOR_CLASSIFIERS;
  std::set<std::string> RED_COLOR_CLASSIFIERS;
  std::vector<std::string> EXPRESSIONS;
  std::vector<std::string> EMOTIONS;
  std::vector<std::string> EMOJIS;
  std::vector<std::string> HEAD_ANGLES;
  std::map<affdex::Glasses, std::string> GLASSES_MAP;
  std::map<affdex::Gender, std::string> GENDER_MAP;
  std::map<affdex::Age, std::string> AGE_MAP;
  std::map<affdex::Ethnicity, std::string> ETHNICITY_MAP;

private:

  /** @brief DrawClassifierOutput Displays a classifier and associated value
  * @param name        -- Name of the classifier
  * @param value       -- Value we are trying to display
  * @param loc         -- Exact location. When aligh_right is (true/false) this should be the (upper-right, upper-left)
  * @param align_right -- Whether to right or left justify the text
  */
  void drawClassifierOutput(const std::string& classifier, const float value,
                            const cv::Point2f& loc, bool align_right=false );
  /** @brief DrawValues displays a list of classifiers and associated values
  * @param names       -- Names of the classifiers to show
  * @param value       -- Value we are trying to display
  * @param x           -- The x value of the location
  * @param padding     -- The padding value
  * @param align_right -- Whether to right or left justify the text
  */
  void drawValues(const float * first, const std::vector<std::string> names,
                  const int x, int &padding, const cv::Scalar clr, const bool align_right);


  /** @brief DrawEqualizer displays an equalizer on screen either right or left justified at the anchor location (loc)
  * @param name        -- Name of the classifier
  * @param value       -- Value we are trying to display
  * @param loc         -- Exact location. When aligh_right is (true/false) this should be the (upper-right, upper-left)
  * @param align_right -- Whether to right or left justify the text
  * @param color       -- Color
  */
  void drawEqualizer(const std::string& name, const float value, const cv::Point2f& loc,
                     bool align_right, cv::Scalar color);

  /** @brief DrawText displays an text on screen either right or left justified at the anchor location (loc)
  * @param name        -- Name of the classifier
  * @param value       -- Value we are trying to display
  * @param loc         -- Exact location. When aligh_right is (true/false) this should be the (upper-right, upper-left)
  * @param align_right -- Whether to right or left justify the text
  * @param color       -- Color
  */
  void drawText(const std::string& name, const std::string& value,
                const cv::Point2f loc, bool align_right=false, cv::Scalar color=cv::Scalar(255,255,255));


  cv::Mat img;
  cv::Mat logo;
  bool logo_resized;
  const int spacing = 20;
  const int LOGO_PADDING = 20;

};

/** @brief Color generator (linear) for red-to-green values
 */
class ColorgenRedGreen
{
public:
    /** @brief ColorgenRedGreen
     * @param[in] red_val - Value which will return green
     * @param green_val - Value which will return green
     */
    ColorgenRedGreen( const float red_val, const float green_val )
        :
          red_val_(red_val),
          green_val_(green_val)
    {}

    /** @brief Generate accessor
     * @param val -- Value for which we would like to generate a color
     * @return  BGR Scalar for use in open cv plotting functions (e.g. cv::circle)
     */
    cv::Scalar operator()( const float val ) const;

private:
    const float red_val_;
    const float green_val_;
};

/**
 * @brief Color generator (linear) between any two colors
 */
class ColorgenLinear
{
public:
    ColorgenLinear( const float val1, const float val2, cv::Scalar color1, cv::Scalar color2 )
        :
          val1_(val1),
          val2_(val2),
          color1_(color1),
          color2_(color2)
    {}

    /** @brief Generate accessor
     * @param val -- Value for which we would like to generate a color
     * @return  BGR Scalar for use in open cv plotting functions (e.g. cv::circle)
     */
    cv::Scalar operator()( const float val ) const;

private:
  const float val1_;
  const float val2_;

  const cv::Scalar color1_;
  const cv::Scalar color2_;

};