#ifndef STAT_BAR_CLASS
#define STAT_BAR_CLASS

#include <string>

#include <glm/glm.hpp>

class Font;
class Box;
class ImageBox;
class TextBox;
class Texture;

// A labelled bar for something like health or stamina, the label sitting just above it
class StatBar {
public:
    struct Style {
        glm::vec3 fillColor = glm::vec3(1.0f);
        glm::vec3 lowColor = glm::vec3(1.0f);  // what the fill turns as it runs low
        float lowFraction = 0.3f;               // starts turning below this much of full
        float width = 300.0f;
        float height = 16.0f;
        bool showLoss = true;                   // sudden drops flash and linger before draining, for hits
        float labelSize = 0.4f;                 // font size of the label

        // With these it's drawn from images instead: fillImage cropped to how full it is, darkened underneath for
        // the empty part, and frameImage over the top. Both stretch to width by height. Colors only tint the fill.
        Texture* fillImage = nullptr;
        Texture* frameImage = nullptr;
    };

    // Makes its GUI, and GUI draws in the order it was made, so make this before whatever should cover it
    StatBar(Font* font, const Style& style);

    // Once a frame, dt in real time. position is the top left of the label in pixels.
    // reset jumps straight to fraction without showing a loss, like when it starts showing someone else.
    // dimmed greys the fill out, for when it can't be used right now.
    void Update(float dt, float opacity, float fraction, const std::string& text, const glm::vec2& position,
        bool reset = false, bool dimmed = false);

    // The label and the bar together, in pixels
    float GetHeight() const;
    float GetWidth() const { return style.width; }

private:
    Style style;
    Box* background = nullptr;
    Box* trail = nullptr;
    Box* fill = nullptr;
    ImageBox* frame = nullptr;      // only drawn from images
    TextBox* label = nullptr;

    float fraction = 1.0f;
    float trailFraction = 1.0f;
    float trailWait = 0.0f;         // how long until the trail starts draining
    float flash = 0.0f;             // 1 just after a sudden drop, fades to 0
    float dim = 0.0f;               // eased toward dimmed

    bool Images() const { return style.fillImage != nullptr; }
};

#endif