#ifndef TEXTURE_H
#define TEXTURE_H

#include <cmath>

#include "vec3.h"

class Texture {
  public:
    virtual Color value(double u, double v, const Point3& p) const = 0;
};

class Solid_color : public Texture {
  public:
    Solid_color() {}
    Solid_color(Color c) : color_value(c) {}

    Solid_color(double red, double green, double blue)
        : Solid_color(Color(red, green, blue)) {}

    virtual Color value(double u, double v, const Vec3& p) const {
        return color_value;
    }

  private:
    Color color_value;
};

class Checker_texture : public Texture {
  public:
    Checker_texture() {}
    Checker_texture(std::shared_ptr<Texture> t0, std::shared_ptr<Texture> t1) : even(t0), odd(t1) {}

    virtual Color value(double u, double v, const Vec3& p) const {
        auto sines = std::sin(10*p.x())*std::sin(10*p.y())*std::sin(10*p.z());
        if (sines < 0)
            return odd->value(u, v, p);
        else
            return even->value(u, v, p);
    }
  private:
    std::shared_ptr<Texture> even;
    std::shared_ptr<Texture> odd;
};

#endif // TEXTURE_H