light_transformer.h

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#pragma once

#include "esphome/core/helpers.h"
#include "esphome/core/hal.h"
#include "light_color_values.h"

namespace esphome {
namespace light {

class LightTransformer {
 public:
  virtual ~LightTransformer() = default;

  void setup(const LightColorValues &start_values, const LightColorValues &target_values, uint32_t length) {
    this->start_time_ = millis();
    this->length_ = length;
    this->start_values_ = start_values;
    this->target_values_ = target_values;
    this->start();
  }

  virtual bool is_finished() { return this->get_progress_() >= 1.0f; }

  virtual void start() {}

  virtual optional<LightColorValues> apply() = 0;

  virtual void stop() {}

  const LightColorValues &get_start_values() const { return this->start_values_; }

  const LightColorValues &get_target_values() const { return this->target_values_; }

 protected:
  float get_progress_() {
    uint32_t now = esphome::millis();
    if (now < this->start_time_)
      return 0.0f;
    if (now >= this->start_time_ + this->length_)
      return 1.0f;

    return clamp((now - this->start_time_) / float(this->length_), 0.0f, 1.0f);
  }

  uint32_t start_time_;
  uint32_t length_;
  LightColorValues start_values_;
  LightColorValues target_values_;
};

}  // namespace light
}  // namespace esphome