#ifndef BusManager_h
#define BusManager_h

/*
 * Class for addressing various light types
 */

#include "const.h"

#define GET_BIT(var,bit)    (((var)>>(bit))&0x01)
#define SET_BIT(var,bit)    ((var)|=(uint16_t)(0x0001<<(bit)))
#define UNSET_BIT(var,bit)  ((var)&=(~(uint16_t)(0x0001<<(bit))))

#define NUM_ICS_WS2812_1CH_3X(len) (((len)+2)/3)   // 1 WS2811 IC controls 3 zones (each zone has 1 LED, W)
#define IC_INDEX_WS2812_1CH_3X(i)  ((i)/3)

#define NUM_ICS_WS2812_2CH_3X(len) (((len)+1)*2/3) // 2 WS2811 ICs control 3 zones (each zone has 2 LEDs, CW and WW)
#define IC_INDEX_WS2812_2CH_3X(i)  ((i)*2/3)
#define WS2812_2CH_3X_SPANS_2_ICS(i) ((i)&0x01)    // every other LED zone is on two different ICs

// flag for using double buffering in BusDigital
extern bool useGlobalLedBuffer;


//temporary struct for passing bus configuration to bus
struct BusConfig {
  uint8_t type;
  uint16_t count;
  uint16_t start;
  uint8_t colorOrder;
  bool reversed;
  uint8_t skipAmount;
  bool refreshReq;
  uint8_t autoWhite;
  uint8_t pins[5] = {LEDPIN, 255, 255, 255, 255};
  uint16_t frequency;
  bool doubleBuffer;

  BusConfig(uint8_t busType, uint8_t* ppins, uint16_t pstart, uint16_t len = 1, uint8_t pcolorOrder = COL_ORDER_GRB, bool rev = false, uint8_t skip = 0, byte aw=RGBW_MODE_MANUAL_ONLY, uint16_t clock_kHz=0U, bool dblBfr=false)
  : count(len)
  , start(pstart)
  , colorOrder(pcolorOrder)
  , reversed(rev)
  , skipAmount(skip)
  , autoWhite(aw)
  , frequency(clock_kHz)
  , doubleBuffer(dblBfr)
  {
    refreshReq = (bool) GET_BIT(busType,7);
    type = busType & 0x7F;  // bit 7 may be/is hacked to include refresh info (1=refresh in off state, 0=no refresh)
    size_t nPins = 1;
    if (type >= TYPE_NET_DDP_RGB && type < 96) nPins = 4; //virtual network bus. 4 "pins" store IP address
    else if (type > 47) nPins = 2;
    else if (type > 40 && type < 46) nPins = NUM_PWM_PINS(type);
    for (size_t i = 0; i < nPins; i++) pins[i] = ppins[i];
  }

  //validates start and length and extends total if needed
  bool adjustBounds(uint16_t& total) {
    if (!count) count = 1;
    if (count > MAX_LEDS_PER_BUS) count = MAX_LEDS_PER_BUS;
    if (start >= MAX_LEDS) return false;
    //limit length of strip if it would exceed total permissible LEDs
    if (start + count > MAX_LEDS) count = MAX_LEDS - start;
    //extend total count accordingly
    if (start + count > total) total = start + count;
    return true;
  }
};


// Defines an LED Strip and its color ordering.
struct ColorOrderMapEntry {
  uint16_t start;
  uint16_t len;
  uint8_t colorOrder;
};

struct ColorOrderMap {
    void add(uint16_t start, uint16_t len, uint8_t colorOrder);

    uint8_t count() const { return _count; }

    void reset() {
      _count = 0;
      memset(_mappings, 0, sizeof(_mappings));
    }

    const ColorOrderMapEntry* get(uint8_t n) const {
      if (n > _count) {
        return nullptr;
      }
      return &(_mappings[n]);
    }

    uint8_t getPixelColorOrder(uint16_t pix, uint8_t defaultColorOrder) const;

  private:
    uint8_t _count;
    ColorOrderMapEntry _mappings[WLED_MAX_COLOR_ORDER_MAPPINGS];
};


//parent class of BusDigital, BusPwm, and BusNetwork
class Bus {
  public:
    Bus(uint8_t type, uint16_t start, uint8_t aw, uint16_t len = 1, bool reversed = false, bool refresh = false)
    : _type(type)
    , _bri(255)
    , _start(start)
    , _len(len)
    , _reversed(reversed)
    , _valid(false)
    , _needsRefresh(refresh)
    , _data(nullptr) // keep data access consistent across all types of buses
    {
      _autoWhiteMode = Bus::hasWhite(_type) ? aw : RGBW_MODE_MANUAL_ONLY;
    };

    virtual ~Bus() {} //throw the bus under the bus

    virtual void     show() = 0;
    virtual bool     canShow()                   { return true; }
    virtual void     setStatusPixel(uint32_t c)  {}
    virtual void     setPixelColor(uint16_t pix, uint32_t c) = 0;
    virtual uint32_t getPixelColor(uint16_t pix) { return 0; }
    virtual void     setBrightness(uint8_t b)    { _bri = b; };
    virtual void     cleanup() = 0;
    virtual uint8_t  getPins(uint8_t* pinArray)  { return 0; }
    virtual uint16_t getLength()                 { return _len; }
    virtual void     setColorOrder()             {}
    virtual uint8_t  getColorOrder()             { return COL_ORDER_RGB; }
    virtual uint8_t  skippedLeds()               { return 0; }
    virtual uint16_t getFrequency()              { return 0U; }
    inline  void     setReversed(bool reversed)  { _reversed = reversed; }
    inline  uint16_t getStart()                  { return _start; }
    inline  void     setStart(uint16_t start)    { _start = start; }
    inline  uint8_t  getType()                   { return _type; }
    inline  bool     isOk()                      { return _valid; }
    inline  bool     isReversed()                { return _reversed; }
    inline  bool     isOffRefreshRequired()      { return _needsRefresh; }
            bool     containsPixel(uint16_t pix) { return pix >= _start && pix < _start+_len; }

    virtual bool hasRGB(void) { return Bus::hasRGB(_type); }
    static  bool hasRGB(uint8_t type) {
      if ((type >= TYPE_WS2812_1CH && type <= TYPE_WS2812_WWA) || type == TYPE_ANALOG_1CH || type == TYPE_ANALOG_2CH || type == TYPE_ONOFF) return false;
      return true;
    }
    virtual bool hasWhite(void) { return Bus::hasWhite(_type); }
    static  bool hasWhite(uint8_t type) {
      if ((type >= TYPE_WS2812_1CH && type <= TYPE_WS2812_WWA) || type == TYPE_SK6812_RGBW || type == TYPE_TM1814) return true; // digital types with white channel
      if (type > TYPE_ONOFF && type <= TYPE_ANALOG_5CH && type != TYPE_ANALOG_3CH) return true; // analog types with white channel
      if (type == TYPE_NET_DDP_RGBW) return true; // network types with white channel
      return false;
    }
    virtual bool hasCCT(void) { return Bus::hasCCT(_type); }
    static  bool hasCCT(uint8_t type) {
      if (type == TYPE_WS2812_2CH_X3 || type == TYPE_WS2812_WWA ||
          type == TYPE_ANALOG_2CH    || type == TYPE_ANALOG_5CH) return true;
      return false;
    }
    static void setCCT(uint16_t cct) {
      _cct = cct;
    }
    static void setCCTBlend(uint8_t b) {
      if (b > 100) b = 100;
      _cctBlend = (b * 127) / 100;
      //compile-time limiter for hardware that can't power both white channels at max
      #ifdef WLED_MAX_CCT_BLEND
        if (_cctBlend > WLED_MAX_CCT_BLEND) _cctBlend = WLED_MAX_CCT_BLEND;
      #endif
    }
    inline        void    setAutoWhiteMode(uint8_t m) { if (m < 5) _autoWhiteMode = m; }
    inline        uint8_t getAutoWhiteMode()          { return _autoWhiteMode; }
    inline static void    setGlobalAWMode(uint8_t m)  { if (m < 5) _gAWM = m; else _gAWM = AW_GLOBAL_DISABLED; }
    inline static uint8_t getGlobalAWMode()           { return _gAWM; }

  protected:
    uint8_t  _type;
    uint8_t  _bri;
    uint16_t _start;
    uint16_t _len;
    bool     _reversed;
    bool     _valid;
    bool     _needsRefresh;
    uint8_t  _autoWhiteMode;
    uint8_t  *_data;
    static uint8_t _gAWM;
    static int16_t _cct;
    static uint8_t _cctBlend;

    uint32_t autoWhiteCalc(uint32_t c);
    uint8_t *allocData(size_t size = 1);
    void     freeData() { if (_data != nullptr) free(_data); _data = nullptr; }
};


class BusDigital : public Bus {
  public:
    BusDigital(BusConfig &bc, uint8_t nr, const ColorOrderMap &com);
    ~BusDigital() { cleanup(); }

    void show();
    bool canShow();
    void setBrightness(uint8_t b);
    void setStatusPixel(uint32_t c);
    void setPixelColor(uint16_t pix, uint32_t c);
    void setColorOrder(uint8_t colorOrder);
    uint32_t getPixelColor(uint16_t pix);
    uint8_t  getColorOrder() { return _colorOrder; }
    uint8_t  getPins(uint8_t* pinArray);
    uint8_t  skippedLeds()   { return _skip; }
    uint16_t getFrequency()  { return _frequencykHz; }
    void reinit();
    void cleanup();

  private:
    uint8_t _skip;
    uint8_t _colorOrder;
    uint8_t _pins[2];
    uint8_t _iType;
    uint16_t _frequencykHz;
    void * _busPtr;
    const ColorOrderMap &_colorOrderMap;
    bool _buffering; // temporary until we figure out why comparison "_data != nullptr" causes severe FPS drop

    inline uint32_t restoreColorLossy(uint32_t c, uint8_t restoreBri) {
      if (restoreBri < 255) {
        uint8_t* chan = (uint8_t*) &c;
        for (uint_fast8_t i=0; i<4; i++) {
          uint_fast16_t val = chan[i];
          chan[i] = ((val << 8) + restoreBri) / (restoreBri + 1); //adding _bri slighly improves recovery / stops degradation on re-scale
        }
      }
      return c;
    }
};


class BusPwm : public Bus {
  public:
    BusPwm(BusConfig &bc);
    ~BusPwm() { cleanup(); }

    void setPixelColor(uint16_t pix, uint32_t c);
    uint32_t getPixelColor(uint16_t pix); //does no index check
    uint8_t  getPins(uint8_t* pinArray);
    uint16_t getFrequency() { return _frequency; }
    void show();
    void cleanup() { deallocatePins(); }

  private:
    uint8_t _pins[5];
    uint8_t _pwmdata[5];
    #ifdef ARDUINO_ARCH_ESP32
    uint8_t _ledcStart;
    #endif
    uint16_t _frequency;

    void deallocatePins();
};


class BusOnOff : public Bus {
  public:
    BusOnOff(BusConfig &bc);
    ~BusOnOff() { cleanup(); }

    void setPixelColor(uint16_t pix, uint32_t c);
    uint32_t getPixelColor(uint16_t pix);
    uint8_t  getPins(uint8_t* pinArray);
    void show();
    void cleanup() { pinManager.deallocatePin(_pin, PinOwner::BusOnOff); }

  private:
    uint8_t _pin;
    uint8_t _onoffdata;
};


class BusNetwork : public Bus {
  public:
    BusNetwork(BusConfig &bc);
    ~BusNetwork() { cleanup(); }

    bool hasRGB()   { return true; }
    bool hasWhite() { return _rgbw; }
    bool canShow()  { return !_broadcastLock; } // this should be a return value from UDP routine if it is still sending data out
    void setPixelColor(uint16_t pix, uint32_t c);
    uint32_t getPixelColor(uint16_t pix);
    uint8_t  getPins(uint8_t* pinArray);
    void show();
    void cleanup();

  private:
    IPAddress _client;
    uint8_t   _UDPtype;
    uint8_t   _UDPchannels;
    bool      _rgbw;
    bool      _broadcastLock;
};


class BusManager {
  public:
    BusManager() : numBusses(0) {};

    //utility to get the approx. memory usage of a given BusConfig
    static uint32_t memUsage(BusConfig &bc);

    int add(BusConfig &bc);

    //do not call this method from system context (network callback)
    void removeAll();

    void show();
    bool canAllShow();
    void setStatusPixel(uint32_t c);
    void setPixelColor(uint16_t pix, uint32_t c);
    void setBrightness(uint8_t b);
    void setSegmentCCT(int16_t cct, bool allowWBCorrection = false);
    uint32_t getPixelColor(uint16_t pix);

    Bus* getBus(uint8_t busNr);

    //semi-duplicate of strip.getLengthTotal() (though that just returns strip._length, calculated in finalizeInit())
    uint16_t getTotalLength();
    inline uint8_t getNumBusses() const { return numBusses; }

    inline void                 updateColorOrderMap(const ColorOrderMap &com) { memcpy(&colorOrderMap, &com, sizeof(ColorOrderMap)); }
    inline const ColorOrderMap& getColorOrderMap() const { return colorOrderMap; }

  private:
    uint8_t numBusses;
    Bus* busses[WLED_MAX_BUSSES+WLED_MIN_VIRTUAL_BUSSES];
    ColorOrderMap colorOrderMap;

    inline uint8_t getNumVirtualBusses() {
      int j = 0;
      for (int i=0; i<numBusses; i++) if (busses[i]->getType() >= TYPE_NET_DDP_RGB && busses[i]->getType() < 96) j++;
      return j;
    }
};
#endif