#include "Tfrag3Data.h"

#include <algorithm>
#include <functional>

#include "common/util/Assert.h"

namespace tfrag3 {

void PackedTieVertices::serialize(Serializer& ser) {
  ser.from_pod_vector(&color_indices);
  ser.from_pod_vector(&matrices);
  ser.from_pod_vector(&matrix_groups);
  ser.from_pod_vector(&vertices);
}

void PackedShrubVertices::serialize(Serializer& ser) {
  ser.from_pod_vector(&matrices);
  ser.from_pod_vector(&instance_groups);
  ser.from_pod_vector(&vertices);
  ser.from_ptr(&total_vertex_count);
}

void StripDraw::serialize(Serializer& ser) {
  ser.from_ptr(&mode);
  ser.from_ptr(&tree_tex_id);
  ser.from_pod_vector(&runs);
  ser.from_pod_vector(&plain_indices);
  ser.from_pod_vector(&vis_groups);
  ser.from_ptr(&num_triangles);
}

void ShrubDraw::serialize(Serializer& ser) {
  ser.from_ptr(&mode);
  ser.from_ptr(&tree_tex_id);
  ser.from_ptr(&num_triangles);
  ser.from_ptr(&first_index_index);
  ser.from_ptr(&num_indices);
}

void InstancedStripDraw::serialize(Serializer& ser) {
  ser.from_ptr(&mode);
  ser.from_ptr(&tree_tex_id);
  ser.from_pod_vector(&vertex_index_stream);
  ser.from_pod_vector(&instance_groups);
  ser.from_ptr(&num_triangles);
}

void TieWindInstance::serialize(Serializer& ser) {
  ser.from_ptr(&matrix);
  ser.from_ptr(&wind_idx);
  ser.from_ptr(&stiffness);
}

void TfragTree::serialize(Serializer& ser) {
  ser.from_ptr(&kind);

  if (ser.is_saving()) {
    ser.save<size_t>(draws.size());
  } else {
    draws.resize(ser.load<size_t>());
  }
  for (auto& draw : draws) {
    draw.serialize(ser);
  }

  // ser.from_pod_vector(&vertices);
  ser.from_pod_vector(&packed_vertices.vertices);
  ser.from_pod_vector(&packed_vertices.cluster_origins);
  ser.from_pod_vector(&colors);
  bvh.serialize(ser);
  ser.from_ptr(&use_strips);
}

void TieTree::unpack() {
  unpacked.vertices.resize(packed_vertices.color_indices.size());
  size_t i = 0;
  for (const auto& grp : packed_vertices.matrix_groups) {
    if (grp.matrix_idx == -1) {
      for (u32 src_idx = grp.start_vert; src_idx < grp.end_vert; src_idx++) {
        auto& vtx = unpacked.vertices[i];
        vtx.color_index = packed_vertices.color_indices[i];
        const auto& proto_vtx = packed_vertices.vertices[src_idx];
        vtx.x = proto_vtx.x;
        vtx.y = proto_vtx.y;
        vtx.z = proto_vtx.z;
        vtx.q_unused = 1.f;
        vtx.s = proto_vtx.s;
        vtx.t = proto_vtx.t;
        i++;
      }
    } else {
      const auto& mat = packed_vertices.matrices[grp.matrix_idx];
      for (u32 src_idx = grp.start_vert; src_idx < grp.end_vert; src_idx++) {
        auto& vtx = unpacked.vertices[i];
        vtx.color_index = packed_vertices.color_indices[i];
        const auto& proto_vtx = packed_vertices.vertices[src_idx];
        auto temp = mat[0] * proto_vtx.x + mat[1] * proto_vtx.y + mat[2] * proto_vtx.z + mat[3];
        vtx.x = temp.x();
        vtx.y = temp.y();
        vtx.z = temp.z();
        vtx.q_unused = 1.f;
        vtx.s = proto_vtx.s;
        vtx.t = proto_vtx.t;
        i++;
      }
    }
  }

  for (auto& draw : static_draws) {
    draw.unpacked.idx_of_first_idx_in_full_buffer = unpacked.indices.size();
    ASSERT(draw.plain_indices.empty());
    for (auto& run : draw.runs) {
      for (u32 ri = 0; ri < run.length; ri++) {
        unpacked.indices.push_back(run.vertex0 + ri);
      }
      unpacked.indices.push_back(UINT32_MAX);
    }
  }
}

void ShrubTree::unpack() {
  unpacked.vertices.resize(packed_vertices.total_vertex_count);
  size_t i = 0;

  for (const auto& grp : packed_vertices.instance_groups) {
    const auto& mat = packed_vertices.matrices[grp.matrix_idx];
    for (u32 src_idx = grp.start_vert; src_idx < grp.end_vert; src_idx++) {
      auto& vtx = unpacked.vertices[i];
      vtx.color_index = grp.color_index;
      const auto& proto_vtx = packed_vertices.vertices[src_idx];
      auto temp = mat[0] * proto_vtx.x + mat[1] * proto_vtx.y + mat[2] * proto_vtx.z + mat[3];
      vtx.x = temp.x();
      vtx.y = temp.y();
      vtx.z = temp.z();
      vtx.s = proto_vtx.s;
      vtx.t = proto_vtx.t;
      memcpy(vtx.rgba_base, proto_vtx.rgba, 3);
      i++;
    }
  }
  ASSERT(i == unpacked.vertices.size());
}

void TfragTree::unpack() {
  unpacked.vertices.resize(packed_vertices.vertices.size());
  for (size_t i = 0; i < unpacked.vertices.size(); i++) {
    auto& o = unpacked.vertices[i];
    auto& in = packed_vertices.vertices[i];
    auto& cluster = packed_vertices.cluster_origins.at(in.cluster_idx);
    constexpr float kClusterSize = 4096 * 40;  // 100 in-game meters
    constexpr float kMasterOffset = 12000 * 4096;
    constexpr float rescale = kClusterSize / UINT16_MAX;
    float cx = -kMasterOffset + kClusterSize * cluster.x();
    float cy = -kMasterOffset + kClusterSize * cluster.y();
    float cz = -kMasterOffset + kClusterSize * cluster.z();
    o.x = cx + in.xoff * rescale;
    o.y = cy + in.yoff * rescale;
    o.z = cz + in.zoff * rescale;
    o.s = in.s / (1024.f);
    o.t = in.t / (1024.f);
    o.q_unused = 1.f;
    o.color_index = in.color_index;
  }

  for (auto& draw : draws) {
    draw.unpacked.idx_of_first_idx_in_full_buffer = unpacked.indices.size();
    for (auto& run : draw.runs) {
      for (u32 ri = 0; ri < run.length; ri++) {
        unpacked.indices.push_back(run.vertex0 + ri);
      }
      if (use_strips) {
        unpacked.indices.push_back(UINT32_MAX);
      }
    }
    unpacked.indices.insert(unpacked.indices.end(), draw.plain_indices.begin(),
                            draw.plain_indices.end());
  }
}

void TieTree::serialize(Serializer& ser) {
  if (ser.is_saving()) {
    ser.save<size_t>(static_draws.size());
  } else {
    static_draws.resize(ser.load<size_t>());
  }
  for (auto& draw : static_draws) {
    draw.serialize(ser);
  }

  if (ser.is_saving()) {
    ser.save<size_t>(instanced_wind_draws.size());
  } else {
    instanced_wind_draws.resize(ser.load<size_t>());
  }
  for (auto& draw : instanced_wind_draws) {
    draw.serialize(ser);
  }

  if (ser.is_saving()) {
    ser.save<size_t>(wind_instance_info.size());
  } else {
    wind_instance_info.resize(ser.load<size_t>());
  }
  for (auto& inst : wind_instance_info) {
    inst.serialize(ser);
  }

  packed_vertices.serialize(ser);
  ser.from_pod_vector(&colors);
  bvh.serialize(ser);
}

void ShrubTree::serialize(Serializer& ser) {
  ser.from_pod_vector(&time_of_day_colors);
  ser.from_pod_vector(&indices);
  packed_vertices.serialize(ser);
  if (ser.is_saving()) {
    ser.save<size_t>(static_draws.size());
  } else {
    static_draws.resize(ser.load<size_t>());
  }
  for (auto& draw : static_draws) {
    draw.serialize(ser);
  }
}

void BVH::serialize(Serializer& ser) {
  ser.from_ptr(&first_leaf_node);
  ser.from_ptr(&last_leaf_node);
  ser.from_ptr(&first_root);
  ser.from_ptr(&num_roots);
  ser.from_ptr(&only_children);
  ser.from_pod_vector(&vis_nodes);
}

void Texture::serialize(Serializer& ser) {
  ser.from_ptr(&w);
  ser.from_ptr(&h);
  ser.from_ptr(&combo_id);
  ser.from_pod_vector(&data);
  ser.from_str(&debug_name);
  ser.from_str(&debug_tpage_name);
  ser.from_ptr(&load_to_pool);
}

void CollisionMesh::serialize(Serializer& ser) {
  ser.from_pod_vector(&vertices);
}

void MercDraw::serialize(Serializer& ser) {
  ser.from_ptr(&mode);
  ser.from_ptr(&tree_tex_id);
  ser.from_ptr(&first_index);
  ser.from_ptr(&index_count);
  ser.from_ptr(&num_triangles);
}

void MercEffect::serialize(Serializer& ser) {
  if (ser.is_saving()) {
    ser.save<size_t>(draws.size());
  } else {
    draws.resize(ser.load<size_t>());
  }
  for (auto& draw : draws) {
    draw.serialize(ser);
  }
}

void MercModel::serialize(Serializer& ser) {
  ser.from_str(&name);
  if (ser.is_saving()) {
    ser.save<size_t>(effects.size());
  } else {
    effects.resize(ser.load<size_t>());
  }
  for (auto& effect : effects) {
    effect.serialize(ser);
  }
  ser.from_ptr(&max_draws);
  ser.from_ptr(&max_bones);
}

void MercModelGroup::serialize(Serializer& ser) {
  if (ser.is_saving()) {
    ser.save<size_t>(models.size());
  } else {
    models.resize(ser.load<size_t>());
  }
  for (auto& model : models) {
    model.serialize(ser);
  }

  ser.from_pod_vector(&indices);
  ser.from_pod_vector(&vertices);
}

void Level::serialize(Serializer& ser) {
  ser.from_ptr(&version);
  if (ser.is_loading() && version != TFRAG3_VERSION) {
    ASSERT_MSG(false, fmt::format("version mismatch when loading tfrag3 data. Got {}, expected {}, "
                                  "did you forget to re-decompile?",
                                  version, TFRAG3_VERSION));
  }

  ser.from_str(&level_name);

  if (ser.is_saving()) {
    ser.save<size_t>(textures.size());
  } else {
    textures.resize(ser.load<size_t>());
  }
  for (auto& tex : textures) {
    tex.serialize(ser);
  }

  for (int geom = 0; geom < 3; ++geom) {
    if (ser.is_saving()) {
      ser.save<size_t>(tfrag_trees[geom].size());
    } else {
      tfrag_trees[geom].resize(ser.load<size_t>());
    }
    for (auto& tree : tfrag_trees[geom]) {
      tree.serialize(ser);
    }
  }

  for (int geom = 0; geom < 4; ++geom) {
    if (ser.is_saving()) {
      ser.save<size_t>(tie_trees[geom].size());
    } else {
      tie_trees[geom].resize(ser.load<size_t>());
    }
    for (auto& tree : tie_trees[geom]) {
      tree.serialize(ser);
    }
  }

  if (ser.is_saving()) {
    ser.save<size_t>(shrub_trees.size());
  } else {
    shrub_trees.resize(ser.load<size_t>());
  }
  for (auto& tree : shrub_trees) {
    tree.serialize(ser);
  }

  collision.serialize(ser);
  merc_data.serialize(ser);

  ser.from_ptr(&version2);
  if (ser.is_loading() && version2 != TFRAG3_VERSION) {
    ASSERT_MSG(false, fmt::format(
                          "version mismatch when loading tfrag3 data (at end). Got {}, expected {}",
                          version2, TFRAG3_VERSION));
  }
}

std::array<int, MemoryUsageCategory::NUM_CATEGORIES> Level::get_memory_usage() const {
  std::array<int, MemoryUsageCategory::NUM_CATEGORIES> result;
  result.fill(0);

  // textures
  for (const auto& tex : textures) {
    result[TEXTURE] += tex.data.size() * sizeof(u32);
  }

  // tfrag
  for (const auto& tfrag_tree_geoms : tfrag_trees) {
    for (const auto& tfrag_tree : tfrag_tree_geoms) {
      for (const auto& draw : tfrag_tree.draws) {
        result[TFRAG_INDEX] += draw.runs.size() * sizeof(StripDraw::VertexRun);
        result[TFRAG_INDEX] += draw.plain_indices.size() * sizeof(u32);
        result[TFRAG_VIS] += draw.vis_groups.size() * sizeof(StripDraw::VisGroup);
      }
      result[TFRAG_VERTS] +=
          tfrag_tree.packed_vertices.vertices.size() * sizeof(PackedTfragVertices::Vertex);
      result[TFRAG_CLUSTER] +=
          tfrag_tree.packed_vertices.cluster_origins.size() * sizeof(math::Vector<u16, 3>);
      result[TFRAG_TIME_OF_DAY] += tfrag_tree.colors.size() * sizeof(TimeOfDayColor);
      result[TFRAG_BVH] += tfrag_tree.bvh.vis_nodes.size() * sizeof(VisNode);
    }
  }

  // tie
  for (const auto& tie_tree_geoms : tie_trees) {
    for (const auto& tie_tree : tie_tree_geoms) {
      result[TIE_BVH] += tie_tree.bvh.vis_nodes.size();
      for (const auto& draw : tie_tree.static_draws) {
        result[TIE_DEINST_INDEX] += draw.runs.size() * sizeof(StripDraw::VertexRun);
        result[TIE_DEINST_VIS] += draw.vis_groups.size() * sizeof(StripDraw::VisGroup);
      }
      result[TIE_VERTS] +=
          tie_tree.packed_vertices.vertices.size() * sizeof(PackedTieVertices::Vertex);
      result[TIE_CIDX] += tie_tree.packed_vertices.color_indices.size() * sizeof(u16);
      result[TIE_MATRICES] += tie_tree.packed_vertices.matrices.size() * 4 * 4 * 4;
      result[TIE_GRPS] +=
          tie_tree.packed_vertices.matrix_groups.size() * sizeof(PackedTieVertices::MatrixGroup);
      result[TIE_TIME_OF_DAY] += tie_tree.colors.size() * sizeof(TimeOfDayColor);

      for (const auto& draw : tie_tree.instanced_wind_draws) {
        result[TIE_INST_INDEX] += draw.vertex_index_stream.size() * sizeof(u32);
        result[TIE_INST_VIS] +=
            draw.instance_groups.size() * sizeof(InstancedStripDraw::InstanceGroup);
      }
      result[TIE_WIND_INSTANCE_INFO] +=
          tie_tree.wind_instance_info.size() * sizeof(TieWindInstance);
    }
  }

  // shrub
  for (const auto& shrub_tree : shrub_trees) {
    result[SHRUB_TIME_OF_DAY] += shrub_tree.time_of_day_colors.size() * sizeof(TimeOfDayColor);
    result[SHRUB_VERT] += shrub_tree.packed_vertices.matrices.size() * 4 * 4 * 4;
    result[SHRUB_VERT] +=
        shrub_tree.packed_vertices.vertices.size() * sizeof(PackedShrubVertices::Vertex);
    result[SHRUB_VERT] += shrub_tree.packed_vertices.instance_groups.size() *
                          sizeof(PackedShrubVertices::InstanceGroup);
    result[SHRUB_IND] += sizeof(u32) * shrub_tree.indices.size();
  }

  // merc
  result[MERC_INDEX] += merc_data.indices.size() * sizeof(u32);
  result[MERC_VERT] += merc_data.vertices.size() * sizeof(MercVertex);

  // collision
  result[COLLISION] += sizeof(CollisionMesh::Vertex) * collision.vertices.size();

  return result;
}

void print_memory_usage(const tfrag3::Level& lev, int uncompressed_data_size) {
  int total_accounted = 0;
  auto memory_use_by_category = lev.get_memory_usage();

  std::vector<std::pair<std::string, int>> known_categories = {
      {"texture", memory_use_by_category[tfrag3::MemoryUsageCategory::TEXTURE]},
      {"tie-deinst-vis", memory_use_by_category[tfrag3::MemoryUsageCategory::TIE_DEINST_VIS]},
      {"tie-deinst-idx", memory_use_by_category[tfrag3::MemoryUsageCategory::TIE_DEINST_INDEX]},
      {"tie-inst-vis", memory_use_by_category[tfrag3::MemoryUsageCategory::TIE_INST_VIS]},
      {"tie-inst-idx", memory_use_by_category[tfrag3::MemoryUsageCategory::TIE_INST_INDEX]},
      {"tie-bvh", memory_use_by_category[tfrag3::MemoryUsageCategory::TIE_BVH]},
      {"tie-verts", memory_use_by_category[tfrag3::MemoryUsageCategory::TIE_VERTS]},
      {"tie-colors", memory_use_by_category[tfrag3::MemoryUsageCategory::TIE_TIME_OF_DAY]},
      {"tie-wind-inst-info",
       memory_use_by_category[tfrag3::MemoryUsageCategory::TIE_WIND_INSTANCE_INFO]},
      {"tie-cidx", memory_use_by_category[tfrag3::MemoryUsageCategory::TIE_CIDX]},
      {"tie-mats", memory_use_by_category[tfrag3::MemoryUsageCategory::TIE_MATRICES]},
      {"tie-grps", memory_use_by_category[tfrag3::MemoryUsageCategory::TIE_GRPS]},
      {"tfrag-vis", memory_use_by_category[tfrag3::MemoryUsageCategory::TFRAG_VIS]},
      {"tfrag-idx", memory_use_by_category[tfrag3::MemoryUsageCategory::TFRAG_INDEX]},
      {"tfrag-vert", memory_use_by_category[tfrag3::MemoryUsageCategory::TFRAG_VERTS]},
      {"tfrag-colors", memory_use_by_category[tfrag3::MemoryUsageCategory::TFRAG_TIME_OF_DAY]},
      {"tfrag-cluster", memory_use_by_category[tfrag3::MemoryUsageCategory::TFRAG_CLUSTER]},
      {"tfrag-bvh", memory_use_by_category[tfrag3::MemoryUsageCategory::TFRAG_BVH]},
      {"shrub-colors", memory_use_by_category[tfrag3::MemoryUsageCategory::SHRUB_TIME_OF_DAY]},
      {"shrub-vert", memory_use_by_category[tfrag3::MemoryUsageCategory::SHRUB_VERT]},
      {"shrub-ind", memory_use_by_category[tfrag3::MemoryUsageCategory::SHRUB_IND]},
      {"collision", memory_use_by_category[tfrag3::MemoryUsageCategory::COLLISION]},
      {"merc-vert", memory_use_by_category[tfrag3::MemoryUsageCategory::MERC_VERT]},
      {"merc-idx", memory_use_by_category[tfrag3::MemoryUsageCategory::MERC_INDEX]}};
  for (auto& known : known_categories) {
    total_accounted += known.second;
  }

  known_categories.push_back({"unknown", uncompressed_data_size - total_accounted});

  std::sort(known_categories.begin(), known_categories.end(),
            [](const auto& a, const auto& b) { return a.second > b.second; });

  for (const auto& x : known_categories) {
    fmt::print("{:30s} : {:6d} kB {:3.1f}%\n", x.first, x.second / 1024,
               100.f * (float)x.second / uncompressed_data_size);
  }
}

std::size_t PreloadedVertex::hash::operator()(const PreloadedVertex& v) const {
  return std::hash<float>()(v.x) ^ std::hash<float>()(v.y) ^ std::hash<float>()(v.z) ^
         std::hash<float>()(v.s) ^ std::hash<float>()(v.t) ^ std::hash<u16>()(v.color_index);
}

}  // namespace tfrag3