/*----------------------------------------------------------------------------/
  Lovyan GFX - Graphics library for embedded devices.

Original Source:
 https://github.com/lovyan03/LovyanGFX/

Licence:
 [FreeBSD](https://github.com/lovyan03/LovyanGFX/blob/master/license.txt)

Author:
 [lovyan03](https://twitter.com/lovyan03)

Contributors:
 [ciniml](https://github.com/ciniml)
 [mongonta0716](https://github.com/mongonta0716)
 [tobozo](https://github.com/tobozo)
/----------------------------------------------------------------------------*/
#include "Panel_LCD.hpp"
#include "../Bus.hpp"
#include "../platforms/common.hpp"
#include "../misc/pixelcopy.hpp"

namespace lgfx
{
 inline namespace v1
 {
//----------------------------------------------------------------------------

  bool Panel_LCD::init(bool use_reset)
  {
    if (!Panel_Device::init(use_reset))
    {
      return false;
    }

    // pin_csが設定されておらずバスタイプがi2cでない場合は、
    // トランザクション終了時にnopを送信する。
    // これによってSPIバスをSDカード等と共有が可能となる。
    // ※ _nop_closingがtrueであることをチェックしている理由は、
    //    派生クラス側でこの機能を無効化できるようにするため。
    //    具体的には、GC9A01はNOPを受信すると誤動作を起こすため無効化する必要がある。
    _nop_closing = _nop_closing && (_cfg.pin_cs < 0) && (_bus->busType() != bus_type_t::bus_i2c);

    startWrite(true);

    for (uint8_t i = 0; auto cmds = getInitCommands(i); i++)
    {
      command_list(cmds);
    }

    endWrite();

    return true;
  }

  void Panel_LCD::beginTransaction(void)
  {
    begin_transaction();
  }
  void Panel_LCD::begin_transaction(void)
  {
    if (_in_transaction) return;
    _in_transaction = true;
    _bus->beginTransaction();
    cs_control(false);
  }

  void Panel_LCD::endTransaction(void)
  {
    end_transaction();
  }
  void Panel_LCD::end_transaction(void)
  {
    if (!_in_transaction) return;
    _in_transaction = false;

    if (_has_align_data)
    {
      _has_align_data = false;
      _bus->writeData(0, 8);
    }

    if (_nop_closing)
    {
      write_command(_cmd_nop); // NOP command
    }
    _bus->wait();
    cs_control(true);
    _bus->endTransaction();
  }

  void Panel_LCD::setInvert(bool invert)
  {
    _invert = invert;
    startWrite();
    write_command((invert ^ _cfg.invert) ? CMD_INVON : CMD_INVOFF);
    _bus->flush();
    endWrite();
  }

  void Panel_LCD::setSleep(bool flg)
  {
    startWrite();
    write_command(flg ? CMD_SLPIN : CMD_SLPOUT);
    _bus->flush();
    endWrite();
  }

  void Panel_LCD::setPowerSave(bool flg)
  {
    startWrite();
    write_command(flg ? CMD_IDMON : CMD_IDMOFF);
    _bus->flush();
    endWrite();
  }

  color_depth_t Panel_LCD::setColorDepth(color_depth_t depth)
  {
    setColorDepth_impl(depth);

    update_madctl();

    return _write_depth;
  }
  void Panel_LCD::setRotation(uint_fast8_t r)
  {
    r &= 7;
    _rotation = r;
    // offset_rotationを加算 (0~3:回転方向、 4:上下反転フラグ);
    _internal_rotation = ((r + _cfg.offset_rotation) & 3) | ((r & 4) ^ (_cfg.offset_rotation & 4));

    auto ox = _cfg.offset_x;
    auto oy = _cfg.offset_y;
    auto pw = _cfg.panel_width;
    auto ph = _cfg.panel_height;
    auto mw = _cfg.memory_width;
    auto mh = _cfg.memory_height;
    if (_internal_rotation & 1)
    {
      std::swap(ox, oy);
      std::swap(pw, ph);
      std::swap(mw, mh);
    }
    _width  = pw;
    _height = ph;
    _colstart = (_internal_rotation & 2)
              ? mw - (pw + ox) : ox;

    _rowstart = ((1 << _internal_rotation) & 0b10010110) // case 1:2:4:7
              ? mh - (ph + oy) : oy;

    _xs = _xe = _ys = _ye = INT16_MAX;

    update_madctl();
  }

  void Panel_LCD::update_madctl(void)
  {
    if (_bus != nullptr)
    {
      
      startWrite();
      write_command(CMD_COLMOD);
      writeData(getColMod(_write_bits), 1);
      write_command(CMD_MADCTL);
      writeData(getMadCtl(_internal_rotation) | (_cfg.rgb_order ? MAD_RGB : MAD_BGR), 1);
      _bus->flush();
      endWrite();
    }
  }

  void Panel_LCD::write_command(uint32_t data)
  {
    if (!_cfg.dlen_16bit)
    {
      _bus->writeCommand(data, 8);
    }
    else
    {
      if (_has_align_data)
      {
        _bus->writeData(0, 8);
        _has_align_data = false;
      }
      _bus->writeCommand(data << 8 | data >> 8, 16);
    }
  }

  uint32_t Panel_LCD::readCommand(uint_fast16_t cmd, uint_fast8_t index, uint_fast8_t length)
  {
    size_t dlen = 8 << _cfg.dlen_16bit;
    startWrite();
    write_command(cmd);
    _bus->beginRead((index * dlen) + _cfg.dummy_read_bits);

    uint32_t res = 0;
    for (size_t i = 0; i < length; ++i)
    {
      res += ((_bus->readData(dlen) >> (dlen - 8)) & 0xFF) << (i * 8);
    }
    cs_control(true);
    _bus->endRead();
    endWrite();

    if (_in_transaction) { cs_control(false); }
    return res;
  }

  uint32_t Panel_LCD::readData(uint_fast8_t index, uint_fast8_t len)
  {
    startWrite();
    auto res = read_bits(index << 3, len << 3);
    endWrite();
    if (_in_transaction) { cs_control(false); }
    return res;
  }

  uint32_t Panel_LCD::read_bits(uint_fast8_t bit_index, uint_fast8_t bit_len)
  {
    _bus->beginRead(bit_index);
    auto res = _bus->readData(bit_len);
    cs_control(true);
    _bus->endRead();
    return res;
  }

  void Panel_LCD::setWindow(uint_fast16_t xs, uint_fast16_t ys, uint_fast16_t xe, uint_fast16_t ye)
  {
    if (!_cfg.dlen_16bit)
    {
      set_window_8(xs, ys, xe, ye, CMD_RAMWR);
    }
    else
    {
      set_window_16(xs, ys, xe, ye, CMD_RAMWR);
    }
  }

  void Panel_LCD::drawPixelPreclipped(uint_fast16_t x, uint_fast16_t y, uint32_t rawcolor)
  {
    bool tr = _in_transaction;
    if (!tr) begin_transaction();

    setWindow(x,y,x,y);
    if (_cfg.dlen_16bit) { _has_align_data = (_write_bits & 15); }
    _bus->writeData(rawcolor, _write_bits);

    if (!tr) end_transaction();
  }

  void Panel_LCD::writeFillRectPreclipped(uint_fast16_t x, uint_fast16_t y, uint_fast16_t w, uint_fast16_t h, uint32_t rawcolor)
  {
    uint32_t len = w * h;
    uint_fast16_t xe = w + x - 1;
    uint_fast16_t ye = y + h - 1;

    setWindow(x,y,xe,ye);
    if (_cfg.dlen_16bit) { _has_align_data = (_write_bits & 15) && (len & 1); }
    _bus->writeDataRepeat(rawcolor, _write_bits, len);
  }

  void Panel_LCD::writeBlock(uint32_t rawcolor, uint32_t len)
  {
    _bus->writeDataRepeat(rawcolor, _write_bits, len);
    if (_cfg.dlen_16bit && (_write_bits & 15) && (len & 1))
    {
      _has_align_data = !_has_align_data;
    }
  }

  void Panel_LCD::writePixels(pixelcopy_t* param, uint32_t len, bool use_dma)
  {
    if (param->no_convert)
    {
      _bus->writeBytes(reinterpret_cast<const uint8_t*>(param->src_data), len * _write_bits >> 3, true, use_dma);
    }
    else
    {
      _bus->writePixels(param, len);
    }
    if (_cfg.dlen_16bit && (_write_bits & 15) && (len & 1))
    {
      _has_align_data = !_has_align_data;
    }
  }

  void Panel_LCD::writeImage(uint_fast16_t x, uint_fast16_t y, uint_fast16_t w, uint_fast16_t h, pixelcopy_t* param, bool use_dma)
  {
    auto bytes = param->dst_bits >> 3;
    auto src_x = param->src_x;

    if (param->transp == pixelcopy_t::NON_TRANSP)
    {
      if (param->no_convert)
      {
        auto wb = w * bytes;
        uint32_t i = (src_x + param->src_y * param->src_bitwidth) * bytes;
        auto src = &((const uint8_t*)param->src_data)[i];
        setWindow(x, y, x + w - 1, y + h - 1);
        if (param->src_bitwidth == w || h == 1)
        {
          write_bytes(src, wb * h, use_dma);
        }
        else
        {
          auto add = param->src_bitwidth * bytes;
          if (use_dma)
          {
            if (_cfg.dlen_16bit && ((wb * h) & 1))
            {
              _has_align_data = !_has_align_data;
            }
            do
            {
              _bus->addDMAQueue(src, wb);
              src += add;
            } while (--h);
            _bus->execDMAQueue();
          }
          else
          {
            do
            {
              write_bytes(src, wb, false);
              src += add;
            } while (--h);
          }
        }
      }
      else
      {
        if (!_bus->busy())
        {
          static constexpr uint32_t WRITEPIXELS_MAXLEN = 32767;

          setWindow(x, y, x + w - 1, y + h - 1);
          // bool nogap = (param->src_bitwidth == w || h == 1);
          bool nogap = (h == 1) || (param->src_y32_add == 0 && ((param->src_bitwidth << pixelcopy_t::FP_SCALE) == (w * param->src_x32_add)));
          if (nogap && (w * h <= WRITEPIXELS_MAXLEN))
          {
            writePixels(param, w * h, use_dma);
          }
          else
          {
            uint_fast16_t h_step = nogap ? WRITEPIXELS_MAXLEN / w : 1;
            uint_fast16_t h_len = (h_step > 1) ? ((h - 1) % h_step) + 1 : 1;
            writePixels(param, w * h_len, use_dma);
            if (h -= h_len)
            {
              param->src_y += h_len;
              do
              {
                param->src_x = src_x;
                writePixels(param, w * h_step, use_dma);
                param->src_y += h_step;
              } while (h -= h_step);
            }
          }
        }
        else
        {
          size_t wb = w * bytes;
          auto buf = _bus->getDMABuffer(wb);
          param->fp_copy(buf, 0, w, param);
          setWindow(x, y, x + w - 1, y + h - 1);
          write_bytes(buf, wb, true);
          _has_align_data = (_cfg.dlen_16bit && (_write_bits & 15) && (w & h & 1));
          while (--h)
          {
            param->src_x = src_x;
            param->src_y++;
            buf = _bus->getDMABuffer(wb);
            param->fp_copy(buf, 0, w, param);
            write_bytes(buf, wb, true);
          }
        }
      }
    }
    else
    {
      h += y;
      uint32_t wb = w * bytes;
      do
      {
        uint32_t i = 0;
        while (w != (i = param->fp_skip(i, w, param)))
        {
          auto buf = _bus->getDMABuffer(wb);
          int32_t len = param->fp_copy(buf, 0, w - i, param);
          setWindow(x + i, y, x + i + len - 1, y);
          write_bytes(buf, len * bytes, true);
          if (w == (i += len)) break;
        }
        param->src_x = src_x;
        param->src_y++;
      } while (++y != h);
    }
  }

  void Panel_LCD::write_bytes(const uint8_t* data, uint32_t len, bool use_dma)
  {
    _bus->writeBytes(data, len, true, use_dma);
    if (_cfg.dlen_16bit && (_write_bits & 15) && (len & 1))
    {
      _has_align_data = !_has_align_data;
    }
  }

  void Panel_LCD::readRect(uint_fast16_t x, uint_fast16_t y, uint_fast16_t w, uint_fast16_t h, void* dst, pixelcopy_t* param)
  {
    uint_fast16_t bytes = param->dst_bits >> 3;
    auto len = w * h;
    if (!_cfg.readable)
    {
      memset(dst, 0, len * bytes);
      return;
    }

    startWrite();
    setWindow(x, y, x + w - 1, y + h - 1);

    write_command(_cmd_ramrd);
    _bus->beginRead(_cfg.dummy_read_pixel);

    if (param->no_convert)
    {
      _bus->readBytes((uint8_t*)dst, len * bytes);
    }
    else
    {
      _bus->readPixels(dst, param, len);
    }
    cs_control(true);
    if (_cfg.end_read_delay_us)
    {
      delayMicroseconds(_cfg.end_read_delay_us);
    }

    _bus->endRead();

    endWrite();

    if (_in_transaction) { cs_control(false); }
  }

  int32_t Panel_LCD::getScanLine(void)
  {
    return getSwap16(readCommand(CMD_GETSCANLINE, 0, 2));
  }

  void Panel_LCD::set_window_8(uint_fast16_t xs, uint_fast16_t ys, uint_fast16_t xe, uint_fast16_t ye, uint32_t cmd)
  {
    static constexpr uint32_t mask = 0xFF00FF;
    uint32_t x = xs + (xe << 16);
    if (_xsxe != x)
    {
      _xsxe = x;
      _bus->writeCommand(CMD_CASET, 8);
      x += _colstart + (_colstart << 16);
      _bus->writeData(((x >> 8) & mask) + ((x & mask) << 8), 32);
    }
    uint32_t y = ys + (ye << 16);
    if (_ysye != y)
    {
      _ysye = y;
      _bus->writeCommand(CMD_RASET, 8);
      y += _rowstart + (_rowstart << 16);
      _bus->writeData(((y >> 8) & mask) + ((y & mask) << 8), 32);
    }
    _bus->writeCommand(cmd, 8);
  }

  void Panel_LCD::set_window_16(uint_fast16_t xs, uint_fast16_t ys, uint_fast16_t xe, uint_fast16_t ye, uint32_t cmd)
  {
    if (_has_align_data)
    {
      _bus->writeData(0, 8);
      _has_align_data = false;
    }
    if (xs != _xs || xe != _xe)
    {
      _bus->writeCommand(CMD_CASET << 8, 16);
      _xs = xs;
      xs += _colstart;
      _bus->writeData((xs >> 8) << 8 | xs << 24, 32);
      _xe = xe;
      xe += _colstart;
      _bus->writeData((xe >> 8) << 8 | xe << 24, 32);
    }
    if (ys != _ys || ye != _ye)
    {
      _bus->writeCommand(CMD_RASET << 8, 16);
      _ys = ys;
      ys += _rowstart;
      _bus->writeData((ys >> 8) << 8 | ys << 24, 32);
      _ye = ye;
      ye += _rowstart;
      _bus->writeData((ye >> 8) << 8 | ye << 24, 32);
    }
    _bus->writeCommand(cmd << 8, 16);
  }

//----------------------------------------------------------------------------
 }
}
