#pragma once
#include <stdint.h>

// Pure logic, shared by the sketch and the native tests. No Arduino libraries.
namespace LumaDesk {
enum class Phase : uint8_t { Focus, Break };
enum class Event : uint8_t { None, ShortPress, LongPress };
struct Timer {
  uint32_t focusMs, breakMs, remainingMs, lastMs;
  Phase phase;
  bool running, started;
  uint16_t cycles;
  Timer(uint32_t focus=25UL*60UL*1000UL, uint32_t rest=5UL*60UL*1000UL)
    : focusMs(focus),breakMs(rest),remainingMs(focus),lastMs(0),phase(Phase::Focus),running(false),started(false),cycles(0) {}
  // Returns true once at a phase boundary. The next phase waits for a press.
  bool tick(uint32_t now) {
    const uint32_t elapsed=now-lastMs; // Unsigned subtraction tolerates millis rollover.
    lastMs=now;
    if(!running) return false;
    if(elapsed<remainingMs){remainingMs-=elapsed;return false;}
    if(phase==Phase::Focus){if(cycles<65535)++cycles;phase=Phase::Break;remainingMs=breakMs;}
    else {phase=Phase::Focus;remainingMs=focusMs;}
    running=false;started=false;return true;
  }
  void toggle(uint32_t now){tick(now);running=!running;started=true;lastMs=now;}
  void reset(uint32_t now){phase=Phase::Focus;remainingMs=focusMs;running=false;started=false;lastMs=now;cycles=0;}
};
struct Button {
  bool raw=false, stable=false, longSent=false;
  uint32_t changed=0, pressedAt=0;
  Event update(bool pressed,uint32_t now){
    if(pressed!=raw){raw=pressed;changed=now;}
    Event event=Event::None;
    if((uint32_t)(now-changed)>=30 && stable!=raw){
      stable=raw;
      if(stable){pressedAt=now;longSent=false;}
      else if(!longSent)event=Event::ShortPress;
    }
    if(stable&&!longSent&&(uint32_t)(now-pressedAt)>=1500){longSent=true;event=Event::LongPress;}
    return event;
  }
};
struct Light {
  bool dim=false;
  void update(uint16_t adc,uint16_t reference,bool calibrated){
    if(!calibrated){dim=false;return;}
    // ADC ratio thresholds, NOT lux or physical illumination percentages.
    if(!dim && (uint32_t)adc*100UL < (uint32_t)reference*65UL)dim=true;
    else if(dim && (uint32_t)adc*100UL >= (uint32_t)reference*75UL)dim=false;
  }
};
}