/*
 * Copyright 2016 Google Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "cobalt/cssom/mtm_function.h"

#include "base/logging.h"
#include "base/string_number_conversions.h"
#include "base/stringprintf.h"
#include "cobalt/cssom/filter_function_list_value.h"
#include "cobalt/cssom/keyword_value.h"
#include "cobalt/cssom/property_value_visitor.h"

namespace cobalt {
namespace cssom {

MTMFunction::MTMFunction(
    const scoped_refptr<PropertyValue>& mesh_url,
    ResolutionMatchedMeshListBuilder resolution_matched_meshes,
    float horizontal_fov, float vertical_fov, const glm::mat4& transform)
    : mesh_url_(mesh_url),
      resolution_matched_meshes_(resolution_matched_meshes.Pass()),
      horizontal_fov_(horizontal_fov),
      vertical_fov_(vertical_fov),
      transform_(transform) {
  DCHECK(mesh_url_);
}

std::string MTMFunction::ToString() const {
  std::string result = "-cobalt-mtm(";

  result.append(mesh_url()->ToString());

  const ResolutionMatchedMeshListBuilder& meshes = resolution_matched_meshes();
  for (size_t mesh_index = 0; mesh_index < meshes.size(); ++mesh_index) {
    result.push_back(' ');
    result.append(base::IntToString(meshes[mesh_index]->width_match()));
    result.push_back(' ');
    result.append(base::IntToString(meshes[mesh_index]->height_match()));
    result.push_back(' ');
    result.append(meshes[mesh_index]->mesh_url()->ToString());
  }

  result.append(base::StringPrintf(", %.7grad", horizontal_fov()));
  result.append(base::StringPrintf(" %.7grad, ", vertical_fov()));

  result.append("matrix3d(");
  for (int col = 0; col <= 3; ++col) {
    for (int row = 0; row <= 3; ++row) {
      if (col > 0 || row > 0) {
        result.append(", ");
      }
      result.append(base::StringPrintf("%.7g", transform()[col][row]));
    }
  }
  result.append("))");

  return result;
}

MTMFunction::ResolutionMatchedMesh::ResolutionMatchedMesh(
    int width_match, int height_match,
    const scoped_refptr<PropertyValue>& mesh_url)
    : width_match_(width_match),
      height_match_(height_match),
      mesh_url_(mesh_url) {
  DCHECK(mesh_url_);
}

bool MTMFunction::ResolutionMatchedMesh::operator==(
    const MTMFunction::ResolutionMatchedMesh& rhs) const {
  return mesh_url()->Equals(*rhs.mesh_url()) &&
         width_match() == rhs.width_match() &&
         height_match() == rhs.height_match();
}

bool MTMFunction::ResolutionMatchedMesh::operator!=(
    const MTMFunction::ResolutionMatchedMesh& rhs) const {
  return !(*this == rhs);
}

const MTMFunction* MTMFunction::ExtractFromFilterList(
    PropertyValue* filter_value) {
  if (filter_value && filter_value != cssom::KeywordValue::GetNone()) {
    const cssom::FilterFunctionListValue::Builder& filter_list =
        base::polymorphic_downcast<cssom::FilterFunctionListValue*>(
            filter_value)
            ->value();

    for (size_t list_index = 0; list_index < filter_list.size(); ++list_index) {
      if (filter_list[list_index]->GetTypeId() ==
          base::GetTypeId<cssom::MTMFunction>()) {
        return base::polymorphic_downcast<const cssom::MTMFunction*>(
            filter_list[list_index]);
      }
    }
  }

  return NULL;
}

bool MTMFunction::operator==(const MTMFunction& rhs) const {
  if (!mesh_url()->Equals(*rhs.mesh_url()) ||
      horizontal_fov() != rhs.horizontal_fov() ||
      horizontal_fov() != rhs.horizontal_fov()) {
    return false;
  }
  const ResolutionMatchedMeshListBuilder& lhs_meshes =
      resolution_matched_meshes();
  const ResolutionMatchedMeshListBuilder& rhs_meshes =
      rhs.resolution_matched_meshes();

  if (lhs_meshes.size() != rhs_meshes.size()) {
    return false;
  }

  for (size_t i = 0; i < lhs_meshes.size(); ++i) {
    if (*lhs_meshes[i] != *rhs_meshes[i]) {
      return false;
    }
  }

  for (int col = 0; col <= 3; ++col) {
    if (!glm::all(glm::equal(transform()[col], rhs.transform()[col]))) {
      return false;
    }
  }

  return true;
}

}  // namespace cssom
}  // namespace cobalt