#include "Runtime/World/CFluidPlane.hpp"

#include "Runtime/CSimplePool.hpp"
#include "Runtime/CStateManager.hpp"
#include "Runtime/GameGlobalObjects.hpp"
#include "Runtime/World/CRipple.hpp"
#include "Runtime/World/CScriptWater.hpp"

namespace urde {

CFluidPlane::CFluidPlane(CAssetId texPattern1, CAssetId texPattern2, CAssetId texColor, float alpha,
                         EFluidType fluidType, float rippleIntensity, const CFluidUVMotion& motion)
: x4_texPattern1Id(texPattern1)
, x8_texPattern2Id(texPattern2)
, xc_texColorId(texColor)
, x40_alpha(alpha)
, x44_fluidType(fluidType)
, x48_rippleIntensity(rippleIntensity)
, x4c_uvMotion(motion) {
  if (g_ResFactory->GetResourceTypeById(texPattern1) == FOURCC('TXTR'))
    x10_texPattern1 = g_SimplePool->GetObj(SObjectTag{FOURCC('TXTR'), texPattern1});
  if (g_ResFactory->GetResourceTypeById(texPattern2) == FOURCC('TXTR'))
    x20_texPattern2 = g_SimplePool->GetObj(SObjectTag{FOURCC('TXTR'), texPattern2});
  if (g_ResFactory->GetResourceTypeById(texColor) == FOURCC('TXTR'))
    x30_texColor = g_SimplePool->GetObj(SObjectTag{FOURCC('TXTR'), texColor});
}

float CFluidPlane::ProjectRippleVelocity(float baseI, float velDot) const {
  float tmp = 0.5f * baseI * velDot * velDot;
  if (tmp != 0.f)
    tmp = std::sqrt(tmp);
  if (tmp >= 160.f)
    return 1.f;
  return tmp / 160.f;
}

float CFluidPlane::CalculateRippleIntensity(float baseI) const {
  float mul = 0.0f;
  switch (x44_fluidType) {
  case EFluidType::NormalWater:
    mul = g_tweakGame->GetRippleIntensityNormal();
    break;
  case EFluidType::PoisonWater:
    mul = g_tweakGame->GetRippleIntensityPoison();
    break;
  case EFluidType::Lava:
    mul = g_tweakGame->GetRippleIntensityLava();
    break;
  case EFluidType::PhazonFluid:
  case EFluidType::Four:
    mul = 0.8f;
    break;
  case EFluidType::ThickLava:
    mul = 1.f;
    break;
  }

  return zeus::clamp(0.f, baseI * mul * (1.f - x48_rippleIntensity + 0.5f), 1.f);
}

void CFluidPlane::AddRipple(float mag, TUniqueId rippler, const zeus::CVector3f& center, CScriptWater& water,
                            CStateManager& mgr) {
  if (!water.CanRippleAtPoint(center))
    return;

  mag = CalculateRippleIntensity(mag);
  mgr.GetFluidPlaneManager()->RippleManager().AddRipple(CRipple(rippler, center, mag));
}

void CFluidPlane::AddRipple(float intensity, TUniqueId rippler, const zeus::CVector3f& center,
                            const zeus::CVector3f& velocity, const CScriptWater& water, CStateManager& mgr,
                            const zeus::CVector3f& upVec) {
  if (!water.CanRippleAtPoint(center))
    return;

  intensity = CalculateRippleIntensity(ProjectRippleVelocity(intensity, upVec.dot(velocity)));
  mgr.GetFluidPlaneManager()->RippleManager().AddRipple(CRipple(rippler, center, intensity));
}

void CFluidPlane::AddRipple(const CRipple& ripple, const CScriptWater& water, CStateManager& mgr) {
  if (!water.CanRippleAtPoint(ripple.GetCenter()))
    return;
  mgr.GetFluidPlaneManager()->RippleManager().AddRipple(ripple);
}

void CFluidPlane::RenderStripWithRipples(float curY, const CFluidPlaneRender::SHFieldSample (&heights)[46][46],
                                         const u8 (&flags)[9][9], int startYDiv,
                                         const CFluidPlaneRender::SPatchInfo& info,
                                         std::vector<CFluidPlaneShader::Vertex>& vOut,
                                         std::vector<CFluidPlaneShader::PatchVertex>& pvOut) {
  m_shader->bindRegular();

  int yTile = (startYDiv + CFluidPlaneRender::numSubdivisionsInTile - 1) / CFluidPlaneRender::numSubdivisionsInTile;
  int endXTile =
      (info.x0_xSubdivs + CFluidPlaneRender::numSubdivisionsInTile - 4) / CFluidPlaneRender::numSubdivisionsInTile;

  int midDiv = CFluidPlaneRender::numSubdivisionsInTile / 2;
  float tileMid = info.x18_rippleResolution * midDiv;
  float yMin = curY;
  float yMid = curY + tileMid;

  float curX = info.x4_localMin.x();
  int gridCell = info.x28_tileX + info.x2a_gridDimX * (info.x2e_tileY + yTile - 1);
  int xTile = 1;
  int tileSpan;
  for (int i = 1; i < info.x0_xSubdivs - 2; i += CFluidPlaneRender::numSubdivisionsInTile * tileSpan,
           gridCell += tileSpan, xTile += tileSpan, curX += info.x14_tileSize * tileSpan) {
    tileSpan = 1;
    if (info.x30_gridFlags && !info.x30_gridFlags[gridCell])
      continue;

    if ((flags[yTile][xTile] & 0x1f) == 0x1f) {
      for (; xTile + tileSpan <= endXTile; ++tileSpan) {
        if ((flags[yTile][xTile + tileSpan] & 0x1f) != 0x1f)
          break;
        if (info.x30_gridFlags && !info.x30_gridFlags[gridCell + tileSpan])
          break;
      }

      int stripDivCount = tileSpan * CFluidPlaneRender::numSubdivisionsInTile + 1;
      int remSubdivs = CFluidPlaneRender::numSubdivisionsInTile;
      std::function<void(float x, float y, const CFluidPlaneRender::SHFieldSample& samp)> func;

      switch (info.x37_normalMode) {
      case CFluidPlaneRender::NormalMode::None:
        func = [&](float x, float y, const CFluidPlaneRender::SHFieldSample& samp) {
          vOut.emplace_back(zeus::CVector3f(x, y, samp.height));
        };
        break;
      case CFluidPlaneRender::NormalMode::NoNormals:
        func = [&](float x, float y, const CFluidPlaneRender::SHFieldSample& samp) {
          vOut.emplace_back(zeus::CVector3f(x, y, samp.height), samp.MakeColor(info));
        };
        break;
      case CFluidPlaneRender::NormalMode::Normals:
        func = [&](float x, float y, const CFluidPlaneRender::SHFieldSample& samp) {
          vOut.emplace_back(zeus::CVector3f(x, y, samp.height), samp.MakeNormal(), samp.MakeColor(info));
        };
        break;
      case CFluidPlaneRender::NormalMode::NBT:
        func = [&](float x, float y, const CFluidPlaneRender::SHFieldSample& samp) {
          vOut.emplace_back(zeus::CVector3f(x, y, samp.height), samp.MakeNormal(), samp.MakeBinormal(),
                            samp.MakeTangent(), samp.MakeColor(info));
        };
        break;
      }

      float curTileY = yMin;
      int curYDiv = startYDiv;
      for (; remSubdivs > 0; --remSubdivs, ++curYDiv, curTileY += info.x18_rippleResolution) {
        size_t start = vOut.size();
        float curTileX = curX;
        for (int v = 0; v < stripDivCount; ++v) {
          func(curTileX, curTileY, heights[curYDiv][i + v]);
          func(curTileX, curTileY + info.x18_rippleResolution, heights[curYDiv + 1][i + v]);
          curTileX += info.x18_rippleResolution;
        }
        CGraphics::DrawArray(start, vOut.size() - start);
      }
    } else {
      bool r19 = (flags[yTile + 1][xTile] & 0x2) != 0; // North
      bool r16 = (flags[yTile][xTile - 1] & 0x8) != 0; // West
      bool r18 = (flags[yTile][xTile + 1] & 0x4) != 0; // East
      bool r17 = (flags[yTile - 1][xTile] & 0x1) != 0; // South

      int r6 = (r19 ? CFluidPlaneRender::numSubdivisionsInTile : 1) + 2;
      r6 += r18 ? CFluidPlaneRender::numSubdivisionsInTile : 1;
      r6 += r17 ? CFluidPlaneRender::numSubdivisionsInTile : 1;
      r6 += r16 ? CFluidPlaneRender::numSubdivisionsInTile : 1;

      if (r6 == 6 && (info.x37_normalMode == CFluidPlaneRender::NormalMode::Normals ||
                      info.x37_normalMode == CFluidPlaneRender::NormalMode::NBT)) {
        for (; xTile + tileSpan <= endXTile; ++tileSpan) {
          if ((flags[yTile][xTile + tileSpan] & 0x1f) == 0x1f)
            break;
          if (info.x30_gridFlags && !info.x30_gridFlags[gridCell + tileSpan])
            break;
          if ((flags[yTile + 1][xTile + tileSpan] & 0x2) != 0x0)
            break;
          if ((flags[yTile][xTile + tileSpan + 1] & 0x4) != 0x0)
            break;
          if ((flags[yTile - 1][xTile + tileSpan] & 0x1) != 0x0)
            break;
        }

        int stripDivCount = tileSpan + 1;
        size_t start = vOut.size();
        switch (info.x37_normalMode) {
        case CFluidPlaneRender::NormalMode::Normals: {
          int curYDiv0 = startYDiv;
          int curYDiv1 = startYDiv + CFluidPlaneRender::numSubdivisionsInTile;
          float curTileX = curX;
          for (int v = 0; v < stripDivCount; ++v) {
            int curXDiv = v * CFluidPlaneRender::numSubdivisionsInTile + i;
            const CFluidPlaneRender::SHFieldSample& samp0 = heights[curYDiv0][curXDiv];
            const CFluidPlaneRender::SHFieldSample& samp1 = heights[curYDiv1][curXDiv];
            vOut.emplace_back(zeus::CVector3f(curTileX, yMin, samp0.height), samp0.MakeNormal(), samp0.MakeColor(info));
            vOut.emplace_back(zeus::CVector3f(curTileX, yMin + info.x14_tileSize, samp1.height), samp1.MakeNormal(),
                              samp1.MakeColor(info));
            curTileX += info.x14_tileSize;
          }
          break;
        }
        case CFluidPlaneRender::NormalMode::NBT: {
          int curYDiv0 = startYDiv;
          int curYDiv1 = startYDiv + CFluidPlaneRender::numSubdivisionsInTile;
          float curTileX = curX;
          for (int v = 0; v < stripDivCount; ++v) {
            int curXDiv = v * CFluidPlaneRender::numSubdivisionsInTile + i;
            const CFluidPlaneRender::SHFieldSample& samp0 = heights[curYDiv0][curXDiv];
            const CFluidPlaneRender::SHFieldSample& samp1 = heights[curYDiv1][curXDiv];
            vOut.emplace_back(zeus::CVector3f(curTileX, yMin, samp0.height), samp0.MakeNormal(), samp0.MakeBinormal(),
                              samp0.MakeTangent(), samp0.MakeColor(info));
            vOut.emplace_back(zeus::CVector3f(curTileX, yMin + info.x14_tileSize, samp1.height), samp1.MakeNormal(),
                              samp1.MakeBinormal(), samp1.MakeTangent(), samp1.MakeColor(info));
            curTileX += info.x14_tileSize;
          }
          break;
        }
        default:
          break;
        }
        CGraphics::DrawArray(start, vOut.size() - start);
      } else {
        TriFanToStrip<CFluidPlaneShader::Vertex> toStrip(vOut);
        std::function<void(float x, float y, const CFluidPlaneRender::SHFieldSample& samp)> func;

        switch (info.x37_normalMode) {
        case CFluidPlaneRender::NormalMode::None:
          func = [&](float x, float y, const CFluidPlaneRender::SHFieldSample& samp) {
            toStrip.EmplaceVert(zeus::CVector3f(x, y, samp.height));
          };
          break;
        case CFluidPlaneRender::NormalMode::NoNormals:
          func = [&](float x, float y, const CFluidPlaneRender::SHFieldSample& samp) {
            toStrip.EmplaceVert(zeus::CVector3f(x, y, samp.height), samp.MakeColor(info));
          };
          break;
        case CFluidPlaneRender::NormalMode::Normals:
          func = [&](float x, float y, const CFluidPlaneRender::SHFieldSample& samp) {
            toStrip.EmplaceVert(zeus::CVector3f(x, y, samp.height), samp.MakeNormal(), samp.MakeColor(info));
          };
          break;
        case CFluidPlaneRender::NormalMode::NBT:
          func = [&](float x, float y, const CFluidPlaneRender::SHFieldSample& samp) {
            toStrip.EmplaceVert(zeus::CVector3f(x, y, samp.height), samp.MakeNormal(), samp.MakeBinormal(),
                                samp.MakeTangent(), samp.MakeColor(info));
          };
          break;
        }

        func(tileMid + curX, yMid, heights[startYDiv + midDiv][i + midDiv]);

        int curXDiv = i;
        int curYDiv = startYDiv + CFluidPlaneRender::numSubdivisionsInTile;
        float curTileX = curX;
        float curTileY = yMin + info.x14_tileSize;
        for (int v = 0; v < (r19 ? CFluidPlaneRender::numSubdivisionsInTile : 1); ++v) {
          const CFluidPlaneRender::SHFieldSample& samp = heights[curYDiv][curXDiv + v];
          func(curTileX, curTileY, samp);
          curTileX += info.x18_rippleResolution;
        }

        curXDiv = i + CFluidPlaneRender::numSubdivisionsInTile;
        curYDiv = startYDiv + CFluidPlaneRender::numSubdivisionsInTile;
        curTileX = curX + info.x14_tileSize;
        curTileY = yMin + info.x14_tileSize;
        for (int v = 0; v < (r18 ? CFluidPlaneRender::numSubdivisionsInTile : 1); ++v) {
          const CFluidPlaneRender::SHFieldSample& samp = heights[curYDiv - v][curXDiv];
          func(curTileX, curTileY, samp);
          curTileY -= info.x18_rippleResolution;
        }

        curXDiv = i + CFluidPlaneRender::numSubdivisionsInTile;
        curYDiv = startYDiv;
        curTileX = curX + info.x14_tileSize;
        curTileY = yMin;
        for (int v = 0; v < (r17 ? CFluidPlaneRender::numSubdivisionsInTile : 1); ++v) {
          const CFluidPlaneRender::SHFieldSample& samp = heights[curYDiv][curXDiv - v];
          func(curTileX, curTileY, samp);
          curTileX -= info.x18_rippleResolution;
        }

        curXDiv = i;
        curYDiv = startYDiv;
        curTileX = curX;
        curTileY = yMin;
        if (r16) {
          for (int v = 0; v < CFluidPlaneRender::numSubdivisionsInTile + 1; ++v) {
            const CFluidPlaneRender::SHFieldSample& samp = heights[curYDiv + v][curXDiv];
            func(curTileX, curTileY, samp);
            curTileY += info.x18_rippleResolution;
          }
        } else {
          {
            const CFluidPlaneRender::SHFieldSample& samp = heights[curYDiv][curXDiv];
            func(curTileX, curTileY, samp);
          }
          curTileY += info.x14_tileSize;
          {
            const CFluidPlaneRender::SHFieldSample& samp =
                heights[curYDiv + CFluidPlaneRender::numSubdivisionsInTile][curXDiv];
            func(curTileX, curTileY, samp);
          }
        }

        toStrip.Draw();
      }
    }
  }
}

void CFluidPlane::RenderPatch(const CFluidPlaneRender::SPatchInfo& info,
                              const CFluidPlaneRender::SHFieldSample (&heights)[46][46], const u8 (&flags)[9][9],
                              bool noRipples, bool flagIs1, std::vector<CFluidPlaneShader::Vertex>& vOut,
                              std::vector<CFluidPlaneShader::PatchVertex>& pvOut) {
  if (noRipples) {
    m_shader->bindRegular();

    float xMin = info.x4_localMin.x();
    float yMin = info.x4_localMin.y();
    float xMax = info.x18_rippleResolution * (info.x0_xSubdivs - 2) + xMin;
    float yMax = info.x18_rippleResolution * (info.x1_ySubdivs - 2) + yMin;

    switch (info.x37_normalMode) {
    case CFluidPlaneRender::NormalMode::None: {
      size_t start = vOut.size();
      vOut.emplace_back(zeus::CVector3f(xMin, yMin, 0.f));
      vOut.emplace_back(zeus::CVector3f(xMin, yMax, 0.f));
      vOut.emplace_back(zeus::CVector3f(xMax, yMin, 0.f));
      vOut.emplace_back(zeus::CVector3f(xMax, yMax, 0.f));
      CGraphics::DrawArray(start, 4);
      break;
    }
    case CFluidPlaneRender::NormalMode::NoNormals: {
      size_t start = vOut.size();
      vOut.emplace_back(zeus::CVector3f(xMin, yMin, 0.f), zeus::skBlack);
      vOut.emplace_back(zeus::CVector3f(xMin, yMax, 0.f), zeus::skBlack);
      vOut.emplace_back(zeus::CVector3f(xMax, yMin, 0.f), zeus::skBlack);
      vOut.emplace_back(zeus::CVector3f(xMax, yMax, 0.f), zeus::skBlack);
      CGraphics::DrawArray(start, 4);
      break;
    }
    case CFluidPlaneRender::NormalMode::Normals: {
      int yTiles = (info.x1_ySubdivs - 3) / CFluidPlaneRender::numSubdivisionsInTile + 1;
      int xTiles = (info.x0_xSubdivs - 3) / CFluidPlaneRender::numSubdivisionsInTile + 1;
      int xTileStart = info.x28_tileX + info.x2e_tileY * info.x2a_gridDimX;
      yMax = yMin;
      for (int curYTile = yTiles; curYTile > 0;
           --curYTile, yMax += info.x14_tileSize, xTileStart += info.x2a_gridDimX) {
        xMax = xMin;
        int nextXTile;
        for (int curXTile = 0; curXTile < xTiles; curXTile = nextXTile) {
          if (!info.x30_gridFlags || info.x30_gridFlags[xTileStart + curXTile]) {
            if (curYTile == yTiles || curYTile == 1 || curXTile == 0 || xTiles - 1 == curXTile) {
              TriFanToStrip<CFluidPlaneShader::Vertex> toStrip(vOut);

              toStrip.EmplaceVert(
                  zeus::CVector3f(xMax + 0.5f * info.x14_tileSize, yMax + 0.5f * info.x14_tileSize, 0.f),
                  zeus::skUp, zeus::skBlack);

              float tmp = xMax;
              for (int v = 0; v < ((curYTile == 1) ? CFluidPlaneRender::numSubdivisionsInTile : 1); ++v) {
                toStrip.EmplaceVert(zeus::CVector3f(tmp, yMax + info.x14_tileSize, 0.f), zeus::skUp,
                                    zeus::skBlack);
                tmp += info.x18_rippleResolution;
              }

              tmp = yMax + info.x14_tileSize;
              for (int v = 0; v < ((xTiles - 1 == curXTile) ? CFluidPlaneRender::numSubdivisionsInTile : 1); ++v) {
                toStrip.EmplaceVert(zeus::CVector3f(xMax + info.x14_tileSize, tmp, 0.f), zeus::skUp,
                                    zeus::skBlack);
                tmp -= info.x18_rippleResolution;
              }

              tmp = xMax + info.x14_tileSize;
              for (int v = 0; v < ((curYTile == yTiles) ? CFluidPlaneRender::numSubdivisionsInTile : 1); ++v) {
                toStrip.EmplaceVert(zeus::CVector3f(tmp, yMax, 0.f), zeus::skUp, zeus::skBlack);
                tmp -= info.x18_rippleResolution;
              }

              tmp = yMax;
              for (int v = 0; v < ((curXTile == 0) ? CFluidPlaneRender::numSubdivisionsInTile : 1); ++v) {
                toStrip.EmplaceVert(zeus::CVector3f(xMax, tmp, 0.f), zeus::skUp, zeus::skBlack);
                tmp += info.x18_rippleResolution;
              }

              toStrip.EmplaceVert(zeus::CVector3f(xMax, yMax + info.x14_tileSize, 0.f), zeus::skUp,
                                  zeus::skBlack);

              toStrip.Draw();

              nextXTile = curXTile + 1;
              xMax += info.x14_tileSize;
            } else {
              nextXTile = curXTile + 1;
              while (nextXTile < xTiles - 1 && (!info.x30_gridFlags || info.x30_gridFlags[xTileStart + nextXTile]))
                ++nextXTile;

              size_t start = vOut.size();
              for (int v = 0; v < nextXTile - curXTile + 1; ++v) {
                vOut.emplace_back(zeus::CVector3f(xMax, yMax, 0.f), zeus::skUp, zeus::skBlack);
                vOut.emplace_back(zeus::CVector3f(xMax, yMax + info.x14_tileSize, 0.f), zeus::skUp,
                                  zeus::skBlack);
                xMax += info.x14_tileSize;
              }
              CGraphics::DrawArray(start, vOut.size() - start);

              ++nextXTile;
              if (nextXTile == xTiles) {
                --nextXTile;
                xMax -= info.x14_tileSize;
              }
            }
          } else {
            nextXTile = curXTile + 1;
            xMax += info.x14_tileSize;
            while (nextXTile < xTiles && !info.x30_gridFlags[xTileStart + nextXTile]) {
              xMax += info.x14_tileSize;
              ++nextXTile;
            }
          }
        }
      }
      break;
    }
    case CFluidPlaneRender::NormalMode::NBT: {
      if (flagIs1 || !info.x30_gridFlags) {
        size_t start = vOut.size();
        vOut.emplace_back(zeus::CVector3f(xMin, yMin, 0.f), zeus::skUp, zeus::skForward,
                          zeus::skRight, zeus::skBlack);
        vOut.emplace_back(zeus::CVector3f(xMin, yMax, 0.f), zeus::skUp, zeus::skForward,
                          zeus::skRight, zeus::skBlack);
        vOut.emplace_back(zeus::CVector3f(xMax, yMin, 0.f), zeus::skUp, zeus::skForward,
                          zeus::skRight, zeus::skBlack);
        vOut.emplace_back(zeus::CVector3f(xMax, yMax, 0.f), zeus::skUp, zeus::skForward,
                          zeus::skRight, zeus::skBlack);
        CGraphics::DrawArray(start, 4);
      } else {
        int xTiles = (info.x0_xSubdivs - 3) / CFluidPlaneRender::numSubdivisionsInTile + 1;
        int yTiles = (info.x1_ySubdivs - 3) / CFluidPlaneRender::numSubdivisionsInTile + 1;
        int xTileStart = info.x28_tileX + info.x2e_tileY * info.x2a_gridDimX;
        for (; yTiles > 0; --yTiles, yMin += info.x14_tileSize, xTileStart += info.x2a_gridDimX) {
          xMax = xMin;
          int nextXTile;
          for (int curXTile = 0; curXTile < xTiles; curXTile = nextXTile) {
            if (info.x30_gridFlags[xTileStart + curXTile]) {
              nextXTile = curXTile + 1;
              int tile = xTileStart + nextXTile;
              while (nextXTile < xTiles && info.x30_gridFlags[tile]) {
                ++nextXTile;
                ++tile;
              }

              size_t start = vOut.size();
              for (int v = 0; v < nextXTile - curXTile + 1; ++v) {
                vOut.emplace_back(zeus::CVector3f(xMax, yMin, 0.f), zeus::skUp, zeus::skForward,
                                  zeus::skRight, zeus::skBlack);
                vOut.emplace_back(zeus::CVector3f(xMax, yMin + info.x14_tileSize, 0.f), zeus::skUp,
                                  zeus::skForward, zeus::skRight, zeus::skBlack);
                xMax += info.x14_tileSize;
              }
              CGraphics::DrawArray(start, vOut.size() - start);
            } else {
              nextXTile = curXTile + 1;
              xMax += info.x14_tileSize;
              int tile = xTileStart + nextXTile;
              while (nextXTile < xTiles && !info.x30_gridFlags[tile]) {
                xMax += info.x14_tileSize;
                ++nextXTile;
                ++tile;
              }
            }
          }
        }
      }
      break;
    }
    }
  } else {
    float curY = info.x4_localMin.y();
    for (int startYDiv = 1; startYDiv < info.x1_ySubdivs - 2;
         startYDiv += CFluidPlaneRender::numSubdivisionsInTile, curY += info.x14_tileSize)
      RenderStripWithRipples(curY, heights, flags, startYDiv, info, vOut, pvOut);
  }
}

} // namespace urde